/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if 0
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\
        The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */
#endif

#ifndef lint
#if 0
static char sccsid[] = "@(#)ftpd.c      8.4 (Berkeley) 4/16/94";
#endif
#endif /* not lint */

#include <sys/cdefs.h>
/*
 * FTP server.
 */
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>

#define FTP_NAMES
#include <arpa/ftp.h>
#include <arpa/inet.h>
#include <arpa/telnet.h>

#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <glob.h>
#include <limits.h>
#include <netdb.h>
#include <pwd.h>
#include <grp.h>
#ifdef HAVE_LIBOPIE
#include <opie.h>
#endif
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include <libutil.h>
#ifdef  LOGIN_CAP
#include <login_cap.h>
#endif

#ifdef USE_PAM
#include <security/pam_appl.h>
#endif

#ifdef __HAIKU__
#include <shadow.h>
#endif

#include "pathnames.h"
#include "extern.h"

#include <stdarg.h>

static char version[] = "Version 6.00LS";
#undef main

union sockunion ctrl_addr;
union sockunion data_source;
union sockunion data_dest;
union sockunion his_addr;
union sockunion pasv_addr;

int     daemon_mode;
int     data;
int     dataport;
int     hostinfo = 1;   /* print host-specific info in messages */
int     logged_in;
struct  passwd *pw;
char    *homedir;
int     ftpdebug;
int     timeout = 900;    /* timeout after 15 minutes of inactivity */
int     maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
int     logging;
int     restricted_data_ports = 1;
int     paranoid = 1;     /* be extra careful about security */
int     anon_only = 0;    /* Only anonymous ftp allowed */
int     assumeutf8 = 0;   /* Assume that server file names are in UTF-8 */
int     guest;
int     dochroot;
char    *chrootdir;
int     dowtmp = 1;
int     stats;
int     statfd = -1;
int     type;
int     form;
int     stru;                   /* avoid C keyword */
int     mode;
int     usedefault = 1;         /* for data transfers */
int     pdata = -1;             /* for passive mode */
int     readonly = 0;           /* Server is in readonly mode.  */
int     noepsv = 0;             /* EPSV command is disabled.    */
int     noretr = 0;             /* RETR command is disabled.    */
int     noguestretr = 0;        /* RETR command is disabled for anon users. */
int     noguestmkd = 0;         /* MKD command is disabled for anon users. */
int     noguestmod = 1;         /* anon users may not modify existing files. */
int     use_blacklist = 0;

off_t   file_size;
off_t   byte_count;
#if !defined(CMASK) || CMASK == 0
#undef CMASK
#define CMASK 027
#endif
int     defumask = CMASK;               /* default umask value */
char    tmpline[7];
char    *hostname;
int     epsvall = 0;

#ifdef VIRTUAL_HOSTING
char    *ftpuser;

static struct ftphost {
        struct ftphost  *next;
        struct addrinfo *hostinfo;
        char            *hostname;
        char            *anonuser;
        char            *statfile;
        char            *welcome;
        char            *loginmsg;
} *thishost, *firsthost;

#endif
char    remotehost[NI_MAXHOST];
char    *ident = NULL;

static char     wtmpid[20];

#ifdef USE_PAM
static int      auth_pam(struct passwd**, const char*);
pam_handle_t    *pamh = NULL;
#endif

#ifdef HAVE_LIBOPIE
static struct opie      opiedata;
static char             opieprompt[OPIE_CHALLENGE_MAX+1];
#endif
static int              pwok;

char    *pid_file = NULL; /* means default location to pidfile(3) */

/*
 * Limit number of pathnames that glob can return.
 * A limit of 0 indicates the number of pathnames is unlimited.
 */
#define MAXGLOBARGS     16384
#

/*
 * Timeout intervals for retrying connections
 * to hosts that don't accept PORT cmds.  This
 * is a kludge, but given the problems with TCP...
 */
#define SWAITMAX        90      /* wait at most 90 seconds */
#define SWAITINT        5       /* interval between retries */

int     swaitmax = SWAITMAX;
int     swaitint = SWAITINT;

#ifdef SETPROCTITLE
char    proctitle[LINE_MAX];    /* initial part of title */
#endif /* SETPROCTITLE */

#define LOGCMD(cmd, file)               logcmd((cmd), (file), NULL, -1)
#define LOGCMD2(cmd, file1, file2)      logcmd((cmd), (file1), (file2), -1)
#define LOGBYTES(cmd, file, cnt)        logcmd((cmd), (file), NULL, (cnt))

static  volatile sig_atomic_t recvurg;
static  int transflag;          /* NB: for debugging only */

#define STARTXFER       flagxfer(1)
#define ENDXFER         flagxfer(0)

#define START_UNSAFE    maskurg(1)
#define END_UNSAFE      maskurg(0)

/* It's OK to put an `else' clause after this macro. */
#define CHECKOOB(action)                                                \
        if (recvurg) {                                                  \
                recvurg = 0;                                            \
                if (myoob()) {                                          \
                        ENDXFER;                                        \
                        action;                                         \
                }                                                       \
        }

#ifdef VIRTUAL_HOSTING
static void      inithosts(int);
static void      selecthost(union sockunion *);
#endif
static void      ack(char *);
static void      sigurg(int);
static void      maskurg(int);
static void      flagxfer(int);
static int       myoob(void);
static int       checkuser(char *, char *, int, char **, int *);
static FILE     *dataconn(char *, off_t, char *);
static void      dolog(struct sockaddr *);
static void      end_login(void);
static FILE     *getdatasock(char *);
static int       guniquefd(char *, char **);
static void      lostconn(int);
static void      sigquit(int);
static int       receive_data(FILE *, FILE *);
static int       send_data(FILE *, FILE *, size_t, off_t, int);
static struct passwd *
                 sgetpwnam(char *);
static char     *sgetsave(char *);
static void      reapchild(int);
static void      appendf(char **, char *, ...) __printflike(2, 3);
static void      logcmd(char *, char *, char *, off_t);
static void      logxfer(char *, off_t, time_t);
static char     *doublequote(char *);
static int      *socksetup(int, char *, const char *);

int
main(int argc, char *argv[], char **envp)
{
        socklen_t addrlen;
        int ch, on = 1, tos, s = STDIN_FILENO;
        char *cp, line[LINE_MAX];
        FILE *fd;
        char    *bindname = NULL;
        const char *bindport = "ftp";
        int     family = AF_UNSPEC;
        struct sigaction sa;

        tzset();                /* in case no timezone database in ~ftp */
        sigemptyset(&sa.sa_mask);
        sa.sa_flags = SA_RESTART;

        /*
         * Prevent diagnostic messages from appearing on stderr.
         * We run as a daemon or from inetd; in both cases, there's
         * more reason in logging to syslog.
         */
        (void) freopen(_PATH_DEVNULL, "w", stderr);
        opterr = 0;

        /*
         * LOG_NDELAY sets up the logging connection immediately,
         * necessary for anonymous ftp's that chroot and can't do it later.
         */
        openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);

        while ((ch = getopt(argc, argv,
                            "468a:ABdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) {
                switch (ch) {
                case '4':
                        family = (family == AF_INET6) ? AF_UNSPEC : AF_INET;
                        break;

                case '6':
                        family = (family == AF_INET) ? AF_UNSPEC : AF_INET6;
                        break;

                case '8':
                        assumeutf8 = 1;
                        break;

                case 'a':
                        bindname = optarg;
                        break;

                case 'A':
                        anon_only = 1;
                        break;

                case 'B':
#ifdef USE_BLACKLIST
                        use_blacklist = 1;
#else
                        syslog(LOG_WARNING, "not compiled with USE_BLACKLIST support");
#endif
                        break;

                case 'd':
                        ftpdebug++;
                        break;

                case 'D':
                        daemon_mode++;
                        break;

                case 'E':
                        noepsv = 1;
                        break;

                case 'h':
                        hostinfo = 0;
                        break;

                case 'l':
                        logging++;      /* > 1 == extra logging */
                        break;

                case 'm':
                        noguestmod = 0;
                        break;

                case 'M':
                        noguestmkd = 1;
                        break;

                case 'o':
                        noretr = 1;
                        break;

                case 'O':
                        noguestretr = 1;
                        break;

                case 'p':
                        pid_file = optarg;
                        break;

                case 'P':
                        bindport = optarg;
                        break;

                case 'r':
                        readonly = 1;
                        break;

                case 'R':
                        paranoid = 0;
                        break;

                case 'S':
                        stats++;
                        break;

                case 't':
                        timeout = atoi(optarg);
                        if (maxtimeout < timeout)
                                maxtimeout = timeout;
                        break;

                case 'T':
                        maxtimeout = atoi(optarg);
                        if (timeout > maxtimeout)
                                timeout = maxtimeout;
                        break;

                case 'u':
                    {
                        long val = 0;

                        val = strtol(optarg, &optarg, 8);
                        if (*optarg != '\0' || val < 0)
                                syslog(LOG_WARNING, "bad value for -u");
                        else
                                defumask = val;
                        break;
                    }
                case 'U':
                        restricted_data_ports = 0;
                        break;

                case 'v':
                        ftpdebug++;
                        break;

                case 'W':
                        dowtmp = 0;
                        break;

                default:
                        syslog(LOG_WARNING, "unknown flag -%c ignored", optopt);
                        break;
                }
        }

        /* handle filesize limit gracefully */
        sa.sa_handler = SIG_IGN;
        (void)sigaction(SIGXFSZ, &sa, NULL);

        if (daemon_mode) {
                int *ctl_sock, fd, maxfd = -1, nfds, i;
                fd_set defreadfds, readfds;
                pid_t pid;
                struct pidfh *pfh;

                if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) {
                        if (errno == EEXIST) {
                                syslog(LOG_ERR, "%s already running, pid %d",
                                       getprogname(), (int)pid);
                                exit(1);
                        }
                        syslog(LOG_WARNING, "pidfile_open: %m");
                }

                /*
                 * Detach from parent.
                 */
                if (daemon(1, 1) < 0) {
                        syslog(LOG_ERR, "failed to become a daemon");
                        exit(1);
                }

                if (pfh != NULL && pidfile_write(pfh) == -1)
                        syslog(LOG_WARNING, "pidfile_write: %m");

                sa.sa_handler = reapchild;
                (void)sigaction(SIGCHLD, &sa, NULL);

#ifdef VIRTUAL_HOSTING
                inithosts(family);
#endif

                /*
                 * Open a socket, bind it to the FTP port, and start
                 * listening.
                 */
                ctl_sock = socksetup(family, bindname, bindport);
                if (ctl_sock == NULL)
                        exit(1);

                FD_ZERO(&defreadfds);
                for (i = 1; i <= *ctl_sock; i++) {
                        FD_SET(ctl_sock[i], &defreadfds);
                        if (listen(ctl_sock[i], 32) < 0) {
                                syslog(LOG_ERR, "control listen: %m");
                                exit(1);
                        }
                        if (maxfd < ctl_sock[i])
                                maxfd = ctl_sock[i];
                }

                /*
                 * Loop forever accepting connection requests and forking off
                 * children to handle them.
                 */
                while (1) {
                        FD_COPY(&defreadfds, &readfds);
                        nfds = select(maxfd + 1, &readfds, NULL, NULL, 0);
                        if (nfds <= 0) {
                                if (nfds < 0 && errno != EINTR)
                                        syslog(LOG_WARNING, "select: %m");
                                continue;
                        }

                        pid = -1;
                        for (i = 1; i <= *ctl_sock; i++)
                                if (FD_ISSET(ctl_sock[i], &readfds)) {
                                        addrlen = sizeof(his_addr);
                                        fd = accept(ctl_sock[i],
                                            (struct sockaddr *)&his_addr,
                                            &addrlen);
                                        if (fd == -1) {
                                                syslog(LOG_WARNING,
                                                       "accept: %m");
                                                continue;
                                        }
                                        switch (pid = fork()) {
                                        case 0:
                                                /* child */
                                                (void) dup2(fd, s);
                                                (void) dup2(fd, STDOUT_FILENO);
                                                (void) close(fd);
                                                for (i = 1; i <= *ctl_sock; i++)
                                                        close(ctl_sock[i]);
                                                if (pfh != NULL)
                                                        pidfile_close(pfh);
                                                goto gotchild;
                                        case -1:
                                                syslog(LOG_WARNING, "fork: %m");
                                                /* FALLTHROUGH */
                                        default:
                                                close(fd);
                                        }
                                }
                }
        } else {
                addrlen = sizeof(his_addr);
                if (getpeername(s, (struct sockaddr *)&his_addr, &addrlen) < 0) {
                        syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
                        exit(1);
                }

#ifdef VIRTUAL_HOSTING
                if (his_addr.su_family == AF_INET6 &&
                    IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr))
                        family = AF_INET;
                else
                        family = his_addr.su_family;
                inithosts(family);
#endif
        }

gotchild:
        sa.sa_handler = SIG_DFL;
        (void)sigaction(SIGCHLD, &sa, NULL);

        sa.sa_handler = sigurg;
        sa.sa_flags = 0;                /* don't restart syscalls for SIGURG */
        (void)sigaction(SIGURG, &sa, NULL);

        sigfillset(&sa.sa_mask);        /* block all signals in handler */
        sa.sa_flags = SA_RESTART;
        sa.sa_handler = sigquit;
        (void)sigaction(SIGHUP, &sa, NULL);
        (void)sigaction(SIGINT, &sa, NULL);
        (void)sigaction(SIGQUIT, &sa, NULL);
        (void)sigaction(SIGTERM, &sa, NULL);

        sa.sa_handler = lostconn;
        (void)sigaction(SIGPIPE, &sa, NULL);

        addrlen = sizeof(ctrl_addr);
        if (getsockname(s, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
                syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
                exit(1);
        }
        dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */
#ifdef VIRTUAL_HOSTING
        /* select our identity from virtual host table */
        selecthost(&ctrl_addr);
#endif
#ifdef IP_TOS
        if (ctrl_addr.su_family == AF_INET)
      {
        tos = IPTOS_LOWDELAY;
        if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
                syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m");
      }
#endif
        /*
         * Disable Nagle on the control channel so that we don't have to wait
         * for peer's ACK before issuing our next reply.
         */
        if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
                syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m");

        data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1);

        (void)snprintf(wtmpid, sizeof(wtmpid), "%xftpd", getpid());

        /* Try to handle urgent data inline */
#ifdef SO_OOBINLINE
        if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0)
                syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m");
#endif

#ifdef  F_SETOWN
        if (fcntl(s, F_SETOWN, getpid()) == -1)
                syslog(LOG_ERR, "fcntl F_SETOWN: %m");
#endif
        dolog((struct sockaddr *)&his_addr);
        /*
         * Set up default state
         */
        data = -1;
        type = TYPE_A;
        form = FORM_N;
        stru = STRU_F;
        mode = MODE_S;
        tmpline[0] = '\0';

        /* If logins are disabled, print out the message. */
        if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
                while (fgets(line, sizeof(line), fd) != NULL) {
                        if ((cp = strchr(line, '\n')) != NULL)
                                *cp = '\0';
                        lreply(530, "%s", line);
                }
                (void) fflush(stdout);
                (void) fclose(fd);
                reply(530, "System not available.");
                exit(0);
        }
#ifdef VIRTUAL_HOSTING
        fd = fopen(thishost->welcome, "r");
#else
        fd = fopen(_PATH_FTPWELCOME, "r");
#endif
        if (fd != NULL) {
                while (fgets(line, sizeof(line), fd) != NULL) {
                        if ((cp = strchr(line, '\n')) != NULL)
                                *cp = '\0';
                        lreply(220, "%s", line);
                }
                (void) fflush(stdout);
                (void) fclose(fd);
                /* reply(220,) must follow */
        }
#ifndef VIRTUAL_HOSTING
        if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
                fatalerror("Ran out of memory.");
        if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
                hostname[0] = '\0';
        hostname[MAXHOSTNAMELEN - 1] = '\0';
#endif
        if (hostinfo)
                reply(220, "%s FTP server (%s) ready.", hostname, version);
        else
                reply(220, "FTP server ready.");
        for (;;)
                (void) yyparse();
        /* NOTREACHED */
}

static void
lostconn(int signo)
{

        if (ftpdebug)
                syslog(LOG_DEBUG, "lost connection");
        dologout(1);
}

static void
sigquit(int signo)
{

        syslog(LOG_ERR, "got signal %d", signo);
        dologout(1);
}

#ifdef VIRTUAL_HOSTING
/*
 * read in virtual host tables (if they exist)
 */

static void
inithosts(int family)
{
        int insert;
        size_t len;
        FILE *fp;
        char *cp, *mp, *line;
        char *hostname;
        char *vhost, *anonuser, *statfile, *welcome, *loginmsg;
        struct ftphost *hrp, *lhrp;
        struct addrinfo hints, *res, *ai;

        /*
         * Fill in the default host information
         */
        if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
                fatalerror("Ran out of memory.");
        if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
                hostname[0] = '\0';
        hostname[MAXHOSTNAMELEN - 1] = '\0';
        if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
                fatalerror("Ran out of memory.");
        hrp->hostname = hostname;
        hrp->hostinfo = NULL;

        memset(&hints, 0, sizeof(hints));
        hints.ai_flags = AI_PASSIVE;
        hints.ai_family = family;
        hints.ai_socktype = SOCK_STREAM;
        if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0)
                hrp->hostinfo = res;
        hrp->statfile = _PATH_FTPDSTATFILE;
        hrp->welcome  = _PATH_FTPWELCOME;
        hrp->loginmsg = _PATH_FTPLOGINMESG;
        hrp->anonuser = "ftp";
        hrp->next = NULL;
        thishost = firsthost = lhrp = hrp;
        if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) {
                int addrsize, gothost;
                void *addr;
                struct hostent *hp;

                while ((line = fgetln(fp, &len)) != NULL) {
                        int     i, hp_error;

                        /* skip comments */
                        if (line[0] == '#')
                                continue;
                        if (line[len - 1] == '\n') {
                                line[len - 1] = '\0';
                                mp = NULL;
                        } else {
                                if ((mp = malloc(len + 1)) == NULL)
                                        fatalerror("Ran out of memory.");
                                memcpy(mp, line, len);
                                mp[len] = '\0';
                                line = mp;
                        }
                        cp = strtok(line, " \t");
                        /* skip empty lines */
                        if (cp == NULL)
                                goto nextline;
                        vhost = cp;

                        /* set defaults */
                        anonuser = "ftp";
                        statfile = _PATH_FTPDSTATFILE;
                        welcome  = _PATH_FTPWELCOME;
                        loginmsg = _PATH_FTPLOGINMESG;

                        /*
                         * Preparse the line so we can use its info
                         * for all the addresses associated with
                         * the virtual host name.
                         * Field 0, the virtual host name, is special:
                         * it's already parsed off and will be strdup'ed
                         * later, after we know its canonical form.
                         */
                        for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++)
                                if (*cp != '-' && (cp = strdup(cp)))
                                        switch (i) {
                                        case 1: /* anon user permissions */
                                                anonuser = cp;
                                                break;
                                        case 2: /* statistics file */
                                                statfile = cp;
                                                break;
                                        case 3: /* welcome message */
                                                welcome  = cp;
                                                break;
                                        case 4: /* login message */
                                                loginmsg = cp;
                                                break;
                                        default: /* programming error */
                                                abort();
                                                /* NOTREACHED */
                                        }

                        hints.ai_flags = AI_PASSIVE;
                        hints.ai_family = family;
                        hints.ai_socktype = SOCK_STREAM;
                        if (getaddrinfo(vhost, NULL, &hints, &res) != 0)
                                goto nextline;
                        for (ai = res; ai != NULL && ai->ai_addr != NULL;
                             ai = ai->ai_next) {

                        gothost = 0;
                        for (hrp = firsthost; hrp != NULL; hrp = hrp->next) {
                                struct addrinfo *hi;

                                for (hi = hrp->hostinfo; hi != NULL;
                                     hi = hi->ai_next)
                                        if (hi->ai_addrlen == ai->ai_addrlen &&
                                            memcmp(hi->ai_addr,
                                                   ai->ai_addr,
                                                   ai->ai_addr->sa_len) == 0) {
                                                gothost++;
                                                break;
                                        }
                                if (gothost)
                                        break;
                        }
                        if (hrp == NULL) {
                                if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
                                        goto nextline;
                                hrp->hostname = NULL;
                                insert = 1;
                        } else {
                                if (hrp->hostinfo && hrp->hostinfo != res)
                                        freeaddrinfo(hrp->hostinfo);
                                insert = 0; /* host already in the chain */
                        }
                        hrp->hostinfo = res;

                        /*
                         * determine hostname to use.
                         * force defined name if there is a valid alias
                         * otherwise fallback to primary hostname
                         */
                        /* XXX: getaddrinfo() can't do alias check */
                        switch(hrp->hostinfo->ai_family) {
                        case AF_INET:
                                addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr;
                                addrsize = sizeof(struct in_addr);
                                break;
                        case AF_INET6:
                                addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr;
                                addrsize = sizeof(struct in6_addr);
                                break;
                        default:
                                /* should not reach here */
                                freeaddrinfo(hrp->hostinfo);
                                if (insert)
                                        free(hrp); /*not in chain, can free*/
                                else
                                        hrp->hostinfo = NULL; /*mark as blank*/
                                goto nextline;
                                /* NOTREACHED */
                        }
                        if ((hp = getipnodebyaddr(addr, addrsize,
                                                  hrp->hostinfo->ai_family,
                                                  &hp_error)) != NULL) {
                                if (strcmp(vhost, hp->h_name) != 0) {
                                        if (hp->h_aliases == NULL)
                                                vhost = hp->h_name;
                                        else {
                                                i = 0;
                                                while (hp->h_aliases[i] &&
                                                       strcmp(vhost, hp->h_aliases[i]) != 0)
                                                        ++i;
                                                if (hp->h_aliases[i] == NULL)
                                                        vhost = hp->h_name;
                                        }
                                }
                        }
                        if (hrp->hostname &&
                            strcmp(hrp->hostname, vhost) != 0) {
                                free(hrp->hostname);
                                hrp->hostname = NULL;
                        }
                        if (hrp->hostname == NULL &&
                            (hrp->hostname = strdup(vhost)) == NULL) {
                                freeaddrinfo(hrp->hostinfo);
                                hrp->hostinfo = NULL; /* mark as blank */
                                if (hp)
                                        freehostent(hp);
                                goto nextline;
                        }
                        hrp->anonuser = anonuser;
                        hrp->statfile = statfile;
                        hrp->welcome  = welcome;
                        hrp->loginmsg = loginmsg;
                        if (insert) {
                                hrp->next  = NULL;
                                lhrp->next = hrp;
                                lhrp = hrp;
                        }
                        if (hp)
                                freehostent(hp);
                      }
nextline:
                        if (mp)
                                free(mp);
                }
                (void) fclose(fp);
        }
}

static void
selecthost(union sockunion *su)
{
        struct ftphost  *hrp;
        u_int16_t port;
#ifdef INET6
        struct in6_addr *mapped_in6 = NULL;
#endif
        struct addrinfo *hi;

#ifdef INET6
        /*
         * XXX IPv4 mapped IPv6 addr consideraton,
         * specified in rfc2373.
         */
        if (su->su_family == AF_INET6 &&
            IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr))
                mapped_in6 = &su->su_sin6.sin6_addr;
#endif

        hrp = thishost = firsthost;     /* default */
        port = su->su_port;
        su->su_port = 0;
        while (hrp != NULL) {
            for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) {
                if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) {
                        thishost = hrp;
                        goto found;
                }
#ifdef INET6
                /* XXX IPv4 mapped IPv6 addr consideraton */
                if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL &&
                    (memcmp(&mapped_in6->s6_addr[12],
                            &((struct sockaddr_in *)hi->ai_addr)->sin_addr,
                            sizeof(struct in_addr)) == 0)) {
                        thishost = hrp;
                        goto found;
                }
#endif
            }
            hrp = hrp->next;
        }
found:
        su->su_port = port;
        /* setup static variables as appropriate */
        hostname = thishost->hostname;
        ftpuser = thishost->anonuser;
}
#endif

/*
 * Helper function for sgetpwnam().
 */
static char *
sgetsave(char *s)
{
        char *new = malloc(strlen(s) + 1);

        if (new == NULL) {
                reply(421, "Ran out of memory.");
                dologout(1);
                /* NOTREACHED */
        }
        (void) strcpy(new, s);
        return (new);
}

/*
 * Save the result of a getpwnam.  Used for USER command, since
 * the data returned must not be clobbered by any other command
 * (e.g., globbing).
 * NB: The data returned by sgetpwnam() will remain valid until
 * the next call to this function.  Its difference from getpwnam()
 * is that sgetpwnam() is known to be called from ftpd code only.
 */
static struct passwd *
sgetpwnam(char *name)
{
        static struct passwd save;
        struct passwd *p;
#ifdef __HAIKU__
        struct spwd *sp = NULL;
#endif

        if ((p = getpwnam(name)) == NULL)
                return (p);
#ifdef __HAIKU__
        if (strcmp(p->pw_passwd, "x") == 0) {
                if ((sp = getspnam(name)) == NULL)
                        return (p);
        }
#endif
        if (save.pw_name) {
                free(save.pw_name);
                free(save.pw_passwd);
                free(save.pw_gecos);
                free(save.pw_dir);
                free(save.pw_shell);
        }
        save = *p;
        save.pw_name = sgetsave(p->pw_name);
#ifdef __HAIKU__
        if (sp)
                save.pw_passwd = sgetsave(sp->sp_pwdp);
        else
#endif
        save.pw_passwd = sgetsave(p->pw_passwd);
        save.pw_gecos = sgetsave(p->pw_gecos);
        save.pw_dir = sgetsave(p->pw_dir);
        save.pw_shell = sgetsave(p->pw_shell);
        return (&save);
}

static int login_attempts;      /* number of failed login attempts */
static int askpasswd;           /* had user command, ask for passwd */
static char curname[MAXLOGNAME];        /* current USER name */

/*
 * USER command.
 * Sets global passwd pointer pw if named account exists and is acceptable;
 * sets askpasswd if a PASS command is expected.  If logged in previously,
 * need to reset state.  If name is "ftp" or "anonymous", the name is not in
 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
 * If account doesn't exist, ask for passwd anyway.  Otherwise, check user
 * requesting login privileges.  Disallow anyone who does not have a standard
 * shell as returned by getusershell().  Disallow anyone mentioned in the file
 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
 */
void
user(char *name)
{
        int ecode;
        char *cp, *shell;

        if (logged_in) {
                if (guest) {
                        reply(530, "Can't change user from guest login.");
                        return;
                } else if (dochroot) {
                        reply(530, "Can't change user from chroot user.");
                        return;
                }
                end_login();
        }

        guest = 0;
#ifdef VIRTUAL_HOSTING
        pw = sgetpwnam(thishost->anonuser);
#else
        pw = sgetpwnam("ftp");
#endif
        if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
                if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL, &ecode) ||
                    (ecode != 0 && ecode != ENOENT))
                        reply(530, "User %s access denied.", name);
                else if (checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL, &ecode) ||
                    (ecode != 0 && ecode != ENOENT))
                        reply(530, "User %s access denied.", name);
                else if (pw != NULL) {
                        guest = 1;
                        askpasswd = 1;
                        reply(331,
                        "Guest login ok, send your email address as password.");
                } else
                        reply(530, "User %s unknown.", name);
                if (!askpasswd && logging)
                        syslog(LOG_NOTICE,
                            "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
                return;
        }
        if (anon_only != 0) {
                reply(530, "Sorry, only anonymous ftp allowed.");
                return;
        }
                
        if ((pw = sgetpwnam(name))) {
                if ((shell = pw->pw_shell) == NULL || *shell == 0)
                        shell = _PATH_BSHELL;
                setusershell();
                while ((cp = getusershell()) != NULL)
                        if (strcmp(cp, shell) == 0)
                                break;
                endusershell();

                if (cp == NULL || 
                    (checkuser(_PATH_FTPUSERS, name, 1, NULL, &ecode) ||
                    (ecode != 0 && ecode != ENOENT))) {
                        reply(530, "User %s access denied.", name);
                        if (logging)
                                syslog(LOG_NOTICE,
                                    "FTP LOGIN REFUSED FROM %s, %s",
                                    remotehost, name);
                        pw = NULL;
                        return;
                }
        }
        if (logging)
                strlcpy(curname, name, sizeof(curname));

        pwok = 0;
#ifdef USE_PAM
        /* XXX Kluge! The conversation mechanism needs to be fixed. */
#endif
#ifdef HAVE_LIBOPIE
        if (opiechallenge(&opiedata, name, opieprompt) == 0) {
                pwok = (pw != NULL) &&
                       opieaccessfile(remotehost) &&
                       opiealways(pw->pw_dir);
                reply(331, "Response to %s %s for %s.",
                      opieprompt, pwok ? "requested" : "required", name);
        } else
#endif
        {
                pwok = 1;
                reply(331, "Password required for %s.", name);
        }
        askpasswd = 1;
        /*
         * Delay before reading passwd after first failed
         * attempt to slow down passwd-guessing programs.
         */
        if (login_attempts)
                sleep(login_attempts);
}

/*
 * Check if a user is in the file "fname",
 * return a pointer to a malloc'd string with the rest
 * of the matching line in "residue" if not NULL.
 */
static int
checkuser(char *fname, char *name, int pwset, char **residue, int *ecode)
{
        FILE *fd;
        int found = 0;
        size_t len;
        char *line, *mp, *p;

        if (ecode != NULL)
                *ecode = 0;
        if ((fd = fopen(fname, "r")) != NULL) {
                while (!found && (line = fgetln(fd, &len)) != NULL) {
                        /* skip comments */
                        if (line[0] == '#')
                                continue;
                        if (line[len - 1] == '\n') {
                                line[len - 1] = '\0';
                                mp = NULL;
                        } else {
                                if ((mp = malloc(len + 1)) == NULL)
                                        fatalerror("Ran out of memory.");
                                memcpy(mp, line, len);
                                mp[len] = '\0';
                                line = mp;
                        }
                        /* avoid possible leading and trailing whitespace */
                        p = strtok(line, " \t");
                        /* skip empty lines */
                        if (p == NULL)
                                goto nextline;
                        /*
                         * if first chr is '@', check group membership
                         */
                        if (p[0] == '@') {
                                int i = 0;
                                struct group *grp;

                                if (p[1] == '\0') /* single @ matches anyone */
                                        found = 1;
                                else {
                                        if ((grp = getgrnam(p+1)) == NULL)
                                                goto nextline;
                                        /*
                                         * Check user's default group
                                         */
                                        if (pwset && grp->gr_gid == pw->pw_gid)
                                                found = 1;
                                        /*
                                         * Check supplementary groups
                                         */
                                        while (!found && grp->gr_mem[i])
                                                found = strcmp(name,
                                                        grp->gr_mem[i++])
                                                        == 0;
                                }
                        }
                        /*
                         * Otherwise, just check for username match
                         */
                        else
                                found = strcmp(p, name) == 0;
                        /*
                         * Save the rest of line to "residue" if matched
                         */
                        if (found && residue) {
                                if ((p = strtok(NULL, "")) != NULL)
                                        p += strspn(p, " \t");
                                if (p && *p) {
                                        if ((*residue = strdup(p)) == NULL)
                                                fatalerror("Ran out of memory.");
                                } else
                                        *residue = NULL;
                        }
nextline:
                        if (mp)
                                free(mp);
                }
                (void) fclose(fd);
        } else if (ecode != NULL)
                *ecode = errno;
        return (found);
}

/*
 * Terminate login as previous user, if any, resetting state;
 * used when USER command is given or login fails.
 */
static void
end_login(void)
{
#ifdef USE_PAM
        int e;
#endif

        (void) seteuid(0);
#ifdef  LOGIN_CAP
        setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN |
                       LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH |
                       LOGIN_SETENV));
#endif
        if (logged_in && dowtmp)
                ftpd_logwtmp(wtmpid, NULL, NULL);
        pw = NULL;
#ifdef USE_PAM
        if (pamh) {
                if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS)
                        syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
                if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS)
                        syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e));
                if ((e = pam_end(pamh, e)) != PAM_SUCCESS)
                        syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
                pamh = NULL;
        }
#endif
        logged_in = 0;
        guest = 0;
        dochroot = 0;
}

#ifdef USE_PAM

/*
 * the following code is stolen from imap-uw PAM authentication module and
 * login.c
 */
#define COPY_STRING(s) (s ? strdup(s) : NULL)

struct cred_t {
        const char *uname;              /* user name */
        const char *pass;               /* password */
};
typedef struct cred_t cred_t;

static int
auth_conv(int num_msg, const struct pam_message **msg,
          struct pam_response **resp, void *appdata)
{
        int i;
        cred_t *cred = (cred_t *) appdata;
        struct pam_response *reply;

        reply = calloc(num_msg, sizeof *reply);
        if (reply == NULL)
                return PAM_BUF_ERR;

        for (i = 0; i < num_msg; i++) {
                switch (msg[i]->msg_style) {
                case PAM_PROMPT_ECHO_ON:        /* assume want user name */
                        reply[i].resp_retcode = PAM_SUCCESS;
                        reply[i].resp = COPY_STRING(cred->uname);
                        /* PAM frees resp. */
                        break;
                case PAM_PROMPT_ECHO_OFF:       /* assume want password */
                        reply[i].resp_retcode = PAM_SUCCESS;
                        reply[i].resp = COPY_STRING(cred->pass);
                        /* PAM frees resp. */
                        break;
                case PAM_TEXT_INFO:
                case PAM_ERROR_MSG:
                        reply[i].resp_retcode = PAM_SUCCESS;
                        reply[i].resp = NULL;
                        break;
                default:                        /* unknown message style */
                        free(reply);
                        return PAM_CONV_ERR;
                }
        }

        *resp = reply;
        return PAM_SUCCESS;
}

/*
 * Attempt to authenticate the user using PAM.  Returns 0 if the user is
 * authenticated, or 1 if not authenticated.  If some sort of PAM system
 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this
 * function returns -1.  This can be used as an indication that we should
 * fall back to a different authentication mechanism.
 */
static int
auth_pam(struct passwd **ppw, const char *pass)
{
        const char *tmpl_user;
        const void *item;
        int rval;
        int e;
        cred_t auth_cred = { (*ppw)->pw_name, pass };
        struct pam_conv conv = { &auth_conv, &auth_cred };

        e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh);
        if (e != PAM_SUCCESS) {
                /*
                 * In OpenPAM, it's OK to pass NULL to pam_strerror()
                 * if context creation has failed in the first place.
                 */
                syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e));
                return -1;
        }

        e = pam_set_item(pamh, PAM_RHOST, remotehost);
        if (e != PAM_SUCCESS) {
                syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
                        pam_strerror(pamh, e));
                if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
                        syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
                }
                pamh = NULL;
                return -1;
        }

        e = pam_authenticate(pamh, 0);
        switch (e) {
        case PAM_SUCCESS:
                /*
                 * With PAM we support the concept of a "template"
                 * user.  The user enters a login name which is
                 * authenticated by PAM, usually via a remote service
                 * such as RADIUS or TACACS+.  If authentication
                 * succeeds, a different but related "template" name
                 * is used for setting the credentials, shell, and
                 * home directory.  The name the user enters need only
                 * exist on the remote authentication server, but the
                 * template name must be present in the local password
                 * database.
                 *
                 * This is supported by two various mechanisms in the
                 * individual modules.  However, from the application's
                 * point of view, the template user is always passed
                 * back as a changed value of the PAM_USER item.
                 */
                if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
                    PAM_SUCCESS) {
                        tmpl_user = (const char *) item;
                        if (strcmp((*ppw)->pw_name, tmpl_user) != 0)
                                *ppw = getpwnam(tmpl_user);
                } else
                        syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
                            pam_strerror(pamh, e));
                rval = 0;
                break;

        case PAM_AUTH_ERR:
        case PAM_USER_UNKNOWN:
        case PAM_MAXTRIES:
                rval = 1;
                break;

        default:
                syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e));
                rval = -1;
                break;
        }

        if (rval == 0) {
                e = pam_acct_mgmt(pamh, 0);
                if (e != PAM_SUCCESS) {
                        syslog(LOG_ERR, "pam_acct_mgmt: %s",
                                                pam_strerror(pamh, e));
                        rval = 1;
                }
        }

        if (rval != 0) {
                if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
                        syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
                }
                pamh = NULL;
        }
        return rval;
}

#endif /* USE_PAM */

void
pass(char *passwd)
{
        int rval, ecode;
        FILE *fd;
#ifdef  LOGIN_CAP
        login_cap_t *lc = NULL;
#endif
#ifdef USE_PAM
        int e;
#endif
        char *residue = NULL;
        char *xpasswd;

        if (logged_in || askpasswd == 0) {
                reply(503, "Login with USER first.");
                return;
        }
        askpasswd = 0;
        if (!guest) {           /* "ftp" is only account allowed no password */
                if (pw == NULL) {
                        rval = 1;       /* failure below */
                        goto skip;
                }
#ifdef USE_PAM
                rval = auth_pam(&pw, passwd);
                if (rval >= 0) {
                        opieunlock();
                        goto skip;
                }
#endif
#ifdef HAVE_LIBOPIE
                if (opieverify(&opiedata, passwd) == 0)
                        xpasswd = pw->pw_passwd;
                else
#endif
                if (pwok) {
                        xpasswd = crypt(passwd, pw->pw_passwd);
                        if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0')
                                xpasswd = ":";
                } else {
                        rval = 1;
                        goto skip;
                }
                rval = strcmp(pw->pw_passwd, xpasswd);
#if (!defined(__BEOS__) && !defined(__HAIKU__))
                if (pw->pw_expire && time(NULL) >= pw->pw_expire)
                        rval = 1;       /* failure */
#endif
skip:
                /*
                 * If rval == 1, the user failed the authentication check
                 * above.  If rval == 0, either PAM or local authentication
                 * succeeded.
                 */
                if (rval) {
                        reply(530, "Login incorrect.");
                        if (logging) {
                                syslog(LOG_NOTICE,
                                    "FTP LOGIN FAILED FROM %s",
                                    remotehost);
                                syslog(LOG_AUTHPRIV | LOG_NOTICE,
                                    "FTP LOGIN FAILED FROM %s, %s",
                                    remotehost, curname);
                        }
                        pw = NULL;
                        if (login_attempts++ >= 5) {
                                syslog(LOG_NOTICE,
                                    "repeated login failures from %s",
                                    remotehost);
                                exit(0);
                        }
                        return;
                }
        }
        login_attempts = 0;             /* this time successful */
        if (setegid(pw->pw_gid) < 0) {
                reply(550, "Can't set gid.");
                return;
        }
        /* May be overridden by login.conf */
        (void) umask(defumask);
#ifdef  LOGIN_CAP
        if ((lc = login_getpwclass(pw)) != NULL) {
                char    remote_ip[NI_MAXHOST];

                if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
                        remote_ip, sizeof(remote_ip) - 1, NULL, 0,
                        NI_NUMERICHOST))
                                *remote_ip = 0;
                remote_ip[sizeof(remote_ip) - 1] = 0;
                if (!auth_hostok(lc, remotehost, remote_ip)) {
                        syslog(LOG_INFO|LOG_AUTH,
                            "FTP LOGIN FAILED (HOST) as %s: permission denied.",
                            pw->pw_name);
                        reply(530, "Permission denied.");
                        pw = NULL;
                        return;
                }
                if (!auth_timeok(lc, time(NULL))) {
                        reply(530, "Login not available right now.");
                        pw = NULL;
                        return;
                }
        }
        setusercontext(lc, pw, 0,
                LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY|
                LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC);
#elif !(defined(__BEOS__) || defined(__HAIKU__))
        setlogin(pw->pw_name);
        (void) initgroups(pw->pw_name, pw->pw_gid);
#endif

#ifdef USE_PAM
        if (pamh) {
                if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) {
                        syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e));
                } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) {
                        syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
                }
        }
#endif

        dochroot =
                checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue, &ecode)
#ifdef  LOGIN_CAP       /* Allow login.conf configuration as well */
                || login_getcapbool(lc, "ftp-chroot", 0)
#endif
        ;
        /*
         * It is possible that checkuser() failed to open the chroot file.
         * If this is the case, report that logins are un-available, since we
         * have no way of checking whether or not the user should be chrooted.
         * We ignore ENOENT since it is not required that this file be present.
         */
        if (ecode != 0 && ecode != ENOENT) {
                reply(530, "Login not available right now.");
                return;
        }
        chrootdir = NULL;

        /* Disable wtmp logging when chrooting. */
        if (dochroot || guest)
                dowtmp = 0;
        if (dowtmp)
                ftpd_logwtmp(wtmpid, pw->pw_name,
                    (struct sockaddr *)&his_addr);
        logged_in = 1;

#ifdef  LOGIN_CAP
        setusercontext(lc, pw, 0, LOGIN_SETRESOURCES);
#endif

        if (guest && stats && statfd < 0) {
#ifdef VIRTUAL_HOSTING
                statfd = open(thishost->statfile, O_WRONLY|O_APPEND);
#else
                statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND);
#endif
                if (statfd < 0)
                        stats = 0;
        }

#if (!defined(__BEOS__) && !defined(__HAIKU__))
        /*
         * For a chrooted local user,
         * a) see whether ftpchroot(5) specifies a chroot directory,
         * b) extract the directory pathname from the line,
         * c) expand it to the absolute pathname if necessary.
         */
        if (dochroot && residue &&
            (chrootdir = strtok(residue, " \t")) != NULL) {
                if (chrootdir[0] != '/')
                        asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir);
                else
                        chrootdir = strdup(chrootdir); /* make it permanent */
                if (chrootdir == NULL)
                        fatalerror("Ran out of memory.");
        }
#endif
        if (guest || dochroot) {
#if (!defined(__BEOS__) && !defined(__HAIKU__))
                /*
                 * If no chroot directory set yet, use the login directory.
                 * Copy it so it can be modified while pw->pw_dir stays intact.
                 */
                if (chrootdir == NULL &&
                    (chrootdir = strdup(pw->pw_dir)) == NULL)
                        fatalerror("Ran out of memory.");
                /*
                 * Check for the "/chroot/./home" syntax,
                 * separate the chroot and home directory pathnames.
                 */
                if ((homedir = strstr(chrootdir, "/./")) != NULL) {
                        *(homedir++) = '\0';    /* wipe '/' */
                        homedir++;              /* skip '.' */
                } else {
                        /*
                         * We MUST do a chdir() after the chroot. Otherwise
                         * the old current directory will be accessible as "."
                         * outside the new root!
                         */
                        homedir = "/";
                }
                /*
                 * Finally, do chroot()
                 */
                if (chroot(chrootdir) < 0) {
                        reply(550, "Can't change root.");
                        goto bad;
                }
#else
                homedir = "/";
#endif
        } else  /* real user w/o chroot */
                homedir = pw->pw_dir;
        /*
         * Set euid *before* doing chdir() so
         * a) the user won't be carried to a directory that he couldn't reach
         *    on his own due to no permission to upper path components,
         * b) NFS mounted homedirs w/restrictive permissions will be accessible
         *    (uid 0 has no root power over NFS if not mapped explicitly.)
         */
        if (seteuid(pw->pw_uid) < 0) {
                if (guest || dochroot) {
                        fatalerror("Can't set uid.");
                } else {
                        reply(550, "Can't set uid.");
                        goto bad;
                }
        }
        /*
         * Do not allow the session to live if we're chroot()'ed and chdir()
         * fails. Otherwise the chroot jail can be escaped.
         */
        if (chdir(homedir) < 0) {
                if (guest || dochroot) {
                        fatalerror("Can't change to base directory.");
                } else {
                        if (chdir("/") < 0) {
                                reply(550, "Root is inaccessible.");
                                goto bad;
                        }
                        lreply(230, "No directory! Logging in with home=/.");
                }
        }

        /*
         * Display a login message, if it exists.
         * N.B. reply(230,) must follow the message.
         */
#ifdef VIRTUAL_HOSTING
        fd = fopen(thishost->loginmsg, "r");
#else
        fd = fopen(_PATH_FTPLOGINMESG, "r");
#endif
        if (fd != NULL) {
                char *cp, line[LINE_MAX];

                while (fgets(line, sizeof(line), fd) != NULL) {
                        if ((cp = strchr(line, '\n')) != NULL)
                                *cp = '\0';
                        lreply(230, "%s", line);
                }
                (void) fflush(stdout);
                (void) fclose(fd);
        }
        if (guest) {
                if (ident != NULL)
                        free(ident);
                ident = strdup(passwd);
                if (ident == NULL)
                        fatalerror("Ran out of memory.");

                reply(230, "Guest login ok, access restrictions apply.");
#ifdef SETPROCTITLE
#ifdef VIRTUAL_HOSTING
                if (thishost != firsthost)
                        snprintf(proctitle, sizeof(proctitle),
                                 "%s: anonymous(%s)/%s", remotehost, hostname,
                                 passwd);
                else
#endif
                        snprintf(proctitle, sizeof(proctitle),
                                 "%s: anonymous/%s", remotehost, passwd);
                setproctitle("%s", proctitle);
#endif /* SETPROCTITLE */
                if (logging)
                        syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
                            remotehost, passwd);
        } else {
                if (dochroot)
                        reply(230, "User %s logged in, "
                                   "access restrictions apply.", pw->pw_name);
                else
                        reply(230, "User %s logged in.", pw->pw_name);

#ifdef SETPROCTITLE
                snprintf(proctitle, sizeof(proctitle),
                         "%s: user/%s", remotehost, pw->pw_name);
                setproctitle("%s", proctitle);
#endif /* SETPROCTITLE */
                if (logging)
                        syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
                            remotehost, pw->pw_name);
        }
        if (logging && (guest || dochroot))
                syslog(LOG_INFO, "session root changed to %s", chrootdir);
#ifdef  LOGIN_CAP
        login_close(lc);
#endif
        if (residue)
                free(residue);
        return;
bad:
        /* Forget all about it... */
#ifdef  LOGIN_CAP
        login_close(lc);
#endif
        if (residue)
                free(residue);
        end_login();
}

void
retrieve(char *cmd, char *name)
{
        FILE *fin, *dout;
        struct stat st;
        int (*closefunc)(FILE *);
        time_t start;
        char line[BUFSIZ];

        if (cmd == 0) {
                fin = fopen(name, "r"), closefunc = fclose;
                st.st_size = 0;
        } else {
                (void) snprintf(line, sizeof(line), cmd, name);
                name = line;
                fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
                st.st_size = -1;
                st.st_blksize = BUFSIZ;
        }
        if (fin == NULL) {
                if (errno != 0) {
                        perror_reply(550, name);
                        if (cmd == 0) {
                                LOGCMD("get", name);
                        }
                }
                return;
        }
        byte_count = -1;
        if (cmd == 0) {
                if (fstat(fileno(fin), &st) < 0) {
                        perror_reply(550, name);
                        goto done;
                }
                if (!S_ISREG(st.st_mode)) {
                        /*
                         * Never sending a raw directory is a workaround
                         * for buggy clients that will attempt to RETR
                         * a directory before listing it, e.g., Mozilla.
                         * Preventing a guest from getting irregular files
                         * is a simple security measure.
                         */
                        if (S_ISDIR(st.st_mode) || guest) {
                                reply(550, "%s: not a plain file.", name);
                                goto done;
                        }
                        st.st_size = -1;
                        /* st.st_blksize is set for all descriptor types */
                }
        }
        if (restart_point) {
                if (type == TYPE_A) {
                        off_t i, n;
                        int c;

                        n = restart_point;
                        i = 0;
                        while (i++ < n) {
                                if ((c=getc(fin)) == EOF) {
                                        perror_reply(550, name);
                                        goto done;
                                }
                                if (c == '\n')
                                        i++;
                        }
                } else if (lseek(fileno(fin), restart_point, L_SET) < 0) {
                        perror_reply(550, name);
                        goto done;
                }
        }
        dout = dataconn(name, st.st_size, "w");
        if (dout == NULL)
                goto done;
        time(&start);
        send_data(fin, dout, st.st_blksize, st.st_size,
                  restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode));
        if (cmd == 0 && guest && stats && byte_count > 0)
                logxfer(name, byte_count, start);
        (void) fclose(dout);
        data = -1;
        pdata = -1;
done:
        if (cmd == 0)
                LOGBYTES("get", name, byte_count);
        (*closefunc)(fin);
}

void
store(char *name, char *mode, int unique)
{
        int fd;
        FILE *fout, *din;
        int (*closefunc)(FILE *);

        if (*mode == 'a') {             /* APPE */
                if (unique) {
                        /* Programming error */
                        syslog(LOG_ERR, "Internal: unique flag to APPE");
                        unique = 0;
                }
                if (guest && noguestmod) {
                        reply(550, "Appending to existing file denied.");
                        goto err;
                }
                restart_point = 0;      /* not affected by preceding REST */
        }
        if (unique)                     /* STOU overrides REST */
                restart_point = 0;
        if (guest && noguestmod) {
                if (restart_point) {    /* guest STOR w/REST */
                        reply(550, "Modifying existing file denied.");
                        goto err;
                } else                  /* treat guest STOR as STOU */
                        unique = 1;
        }

        if (restart_point)
                mode = "r+";    /* so ASCII manual seek can work */
        if (unique) {
                if ((fd = guniquefd(name, &name)) < 0)
                        goto err;
                fout = fdopen(fd, mode);
        } else
                fout = fopen(name, mode);
        closefunc = fclose;
        if (fout == NULL) {
                perror_reply(553, name);
                goto err;
        }
        byte_count = -1;
        if (restart_point) {
                if (type == TYPE_A) {
                        off_t i, n;
                        int c;

                        n = restart_point;
                        i = 0;
                        while (i++ < n) {
                                if ((c=getc(fout)) == EOF) {
                                        perror_reply(550, name);
                                        goto done;
                                }
                                if (c == '\n')
                                        i++;
                        }
                        /*
                         * We must do this seek to "current" position
                         * because we are changing from reading to
                         * writing.
                         */
                        if (fseeko(fout, 0, SEEK_CUR) < 0) {
                                perror_reply(550, name);
                                goto done;
                        }
                } else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
                        perror_reply(550, name);
                        goto done;
                }
        }
        din = dataconn(name, -1, "r");
        if (din == NULL)
                goto done;
        if (receive_data(din, fout) == 0) {
                if (unique)
                        reply(226, "Transfer complete (unique file name:%s).",
                            name);
                else
                        reply(226, "Transfer complete.");
        }
        (void) fclose(din);
        data = -1;
        pdata = -1;
done:
        LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count);
        (*closefunc)(fout);
        return;
err:
        LOGCMD(*mode == 'a' ? "append" : "put" , name);
        return;
}

static FILE *
getdatasock(char *mode)
{
        int on = 1, s, t, tries;

        if (data >= 0)
                return (fdopen(data, mode));

        s = socket(data_dest.su_family, SOCK_STREAM, 0);
        if (s < 0)
                goto bad;
        if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
                syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m");
        /* anchor socket to avoid multi-homing problems */
        data_source = ctrl_addr;
        data_source.su_port = htons(dataport);
        (void) seteuid(0);
        for (tries = 1; ; tries++) {
                /*
                 * We should loop here since it's possible that
                 * another ftpd instance has passed this point and is
                 * trying to open a data connection in active mode now.
                 * Until the other connection is opened, we'll be getting
                 * EADDRINUSE because no SOCK_STREAM sockets in the system
                 * can share both local and remote addresses, localIP:20
                 * and *:* in this case.
                 */
                if (bind(s, (struct sockaddr *)&data_source,
                    data_source.su_len) >= 0)
                        break;
                if (errno != EADDRINUSE || tries > 10)
                        goto bad;
                sleep(tries);
        }
        (void) seteuid(pw->pw_uid);
#ifdef IP_TOS
        if (data_source.su_family == AF_INET)
      {
        on = IPTOS_THROUGHPUT;
        if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0)
                syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m");
      }
#endif
#ifdef TCP_NOPUSH
        /*
         * Turn off push flag to keep sender TCP from sending short packets
         * at the boundaries of each write().
         */
        on = 1;
        if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0)
                syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m");
#endif
        return (fdopen(s, mode));
bad:
        /* Return the real value of errno (close may change it) */
        t = errno;
        (void) seteuid(pw->pw_uid);
        (void) close(s);
        errno = t;
        return (NULL);
}

static FILE *
dataconn(char *name, off_t size, char *mode)
{
        char sizebuf[32];
        FILE *file;
        int retry = 0, tos, conerrno;

        file_size = size;
        byte_count = 0;
        if (size != -1)
                (void) snprintf(sizebuf, sizeof(sizebuf),
                                " (%jd bytes)", (intmax_t)size);
        else
                *sizebuf = '\0';
        if (pdata >= 0) {
                union sockunion from;
                socklen_t fromlen = ctrl_addr.su_len;
                int flags, s;
                struct timeval timeout;
                fd_set set;

                FD_ZERO(&set);
                FD_SET(pdata, &set);

                timeout.tv_usec = 0;
                timeout.tv_sec = 120;

                /*
                 * Granted a socket is in the blocking I/O mode,
                 * accept() will block after a successful select()
                 * if the selected connection dies in between.
                 * Therefore set the non-blocking I/O flag here.
                 */
                if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
                    fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1)
                        goto pdata_err;
                if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 ||
                    (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0)
                        goto pdata_err;
                (void) close(pdata);
                pdata = s;
                /*
                 * Unset the inherited non-blocking I/O flag
                 * on the child socket so stdio can work on it.
                 */
                if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
                    fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1)
                        goto pdata_err;
#ifdef IP_TOS
                if (from.su_family == AF_INET)
              {
                tos = IPTOS_THROUGHPUT;
                if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
                        syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m");
              }
#endif
                reply(150, "Opening %s mode data connection for '%s'%s.",
                     type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
                return (fdopen(pdata, mode));
pdata_err:
                reply(425, "Can't open data connection.");
                (void) close(pdata);
                pdata = -1;
                return (NULL);
        }
        if (data >= 0) {
                reply(125, "Using existing data connection for '%s'%s.",
                    name, sizebuf);
                usedefault = 1;
                return (fdopen(data, mode));
        }
        if (usedefault)
                data_dest = his_addr;
        usedefault = 1;
        do {
                file = getdatasock(mode);
                if (file == NULL) {
                        char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV];

                        if (getnameinfo((struct sockaddr *)&data_source,
                                data_source.su_len,
                                hostbuf, sizeof(hostbuf) - 1,
                                portbuf, sizeof(portbuf) - 1,
                                NI_NUMERICHOST|NI_NUMERICSERV))
                                        *hostbuf = *portbuf = 0;
                        hostbuf[sizeof(hostbuf) - 1] = 0;
                        portbuf[sizeof(portbuf) - 1] = 0;
                        reply(425, "Can't create data socket (%s,%s): %s.",
                                hostbuf, portbuf, strerror(errno));
                        return (NULL);
                }
                data = fileno(file);
                conerrno = 0;
                if (connect(data, (struct sockaddr *)&data_dest,
                    data_dest.su_len) == 0)
                        break;
                conerrno = errno;
                (void) fclose(file);
                data = -1;
                if (conerrno == EADDRINUSE) {
                        sleep(swaitint);
                        retry += swaitint;
                } else {
                        break;
                }
        } while (retry <= swaitmax);
        if (conerrno != 0) {
                reply(425, "Can't build data connection: %s.",
                           strerror(conerrno));
                return (NULL);
        }
        reply(150, "Opening %s mode data connection for '%s'%s.",
             type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
        return (file);
}

/*
 * A helper macro to avoid code duplication
 * in send_data() and receive_data().
 *
 * XXX We have to block SIGURG during putc() because BSD stdio
 * is unable to restart interrupted write operations and hence
 * the entire buffer contents will be lost as soon as a write()
 * call indicates EINTR to stdio.
 */
#define FTPD_PUTC(ch, file, label)                                      \
        do {                                                            \
                int ret;                                                \
                                                                        \
                do {                                                    \
                        START_UNSAFE;                                   \
                        ret = putc((ch), (file));                       \
                        END_UNSAFE;                                     \
                        CHECKOOB(return (-1))                           \
                        else if (ferror(file))                          \
                                goto label;                             \
                        clearerr(file);                                 \
                } while (ret == EOF);                                   \
        } while (0)

/*
 * Transfer the contents of "instr" to "outstr" peer using the appropriate
 * encapsulation of the data subject to Mode, Structure, and Type.
 *
 * NB: Form isn't handled.
 */
static int
send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg)
{
        int c, cp, filefd, netfd;
        char *buf;

        STARTXFER;

        switch (type) {

        case TYPE_A:
                cp = EOF;
                for (;;) {
                        c = getc(instr);
                        CHECKOOB(return (-1))
                        else if (c == EOF && ferror(instr))
                                goto file_err;
                        if (c == EOF) {
                                if (ferror(instr)) {    /* resume after OOB */
                                        clearerr(instr);
                                        continue;
                                }
                                if (feof(instr))        /* EOF */
                                        break;
                                syslog(LOG_ERR, "Internal: impossible condition"
                                                " on file after getc()");
                                goto file_err;
                        }
                        if (c == '\n' && cp != '\r') {
                                FTPD_PUTC('\r', outstr, data_err);
                                byte_count++;
                        }
                        FTPD_PUTC(c, outstr, data_err);
                        byte_count++;
                        cp = c;
                }
#ifdef notyet   /* BSD stdio isn't ready for that */
                while (fflush(outstr) == EOF) {
                        CHECKOOB(return (-1))
                        else
                                goto data_err;
                        clearerr(outstr);
                }
                ENDXFER;
#else
                ENDXFER;
                if (fflush(outstr) == EOF)
                        goto data_err;
#endif
                reply(226, "Transfer complete.");
                return (0);

        case TYPE_I:
        case TYPE_L:
                /*
                 * isreg is only set if we are not doing restart and we
                 * are sending a regular file
                 */
                netfd = fileno(outstr);
                filefd = fileno(instr);

#if (!defined(__BEOS__) && !defined(__HAIKU__))
                if (isreg) {
                        char *msg = "Transfer complete.";
                        off_t cnt, offset;
                        int err;

                        cnt = offset = 0;

                        while (filesize > 0) {
                                err = sendfile(filefd, netfd, offset, 0,
                                               NULL, &cnt, 0);
                                /*
                                 * Calculate byte_count before OOB processing.
                                 * It can be used in myoob() later.
                                 */
                                byte_count += cnt;
                                offset += cnt;
                                filesize -= cnt;
                                CHECKOOB(return (-1))
                                else if (err == -1) {
                                        if (errno != EINTR &&
                                            cnt == 0 && offset == 0)
                                                goto oldway;
                                        goto data_err;
                                }
                                if (err == -1)  /* resume after OOB */
                                        continue;
                                /*
                                 * We hit the EOF prematurely.
                                 * Perhaps the file was externally truncated.
                                 */
                                if (cnt == 0) {
                                        msg = "Transfer finished due to "
                                              "premature end of file.";
                                        break;
                                }
                        }
                        ENDXFER;
                        reply(226, "%s", msg);
                        return (0);
                }

oldway:
#endif  /* !__BEOS__ */
                if ((buf = malloc(blksize)) == NULL) {
                        ENDXFER;
                        reply(451, "Ran out of memory.");
                        return (-1);
                }

                for (;;) {
                        int cnt, len;
                        char *bp;

                        cnt = read(filefd, buf, blksize);
                        CHECKOOB(free(buf); return (-1))
                        else if (cnt < 0) {
                                free(buf);
                                goto file_err;
                        }
                        if (cnt < 0)    /* resume after OOB */
                                continue;
                        if (cnt == 0)   /* EOF */
                                break;
                        for (len = cnt, bp = buf; len > 0;) {
                                cnt = write(netfd, bp, len);
                                CHECKOOB(free(buf); return (-1))
                                else if (cnt < 0) {
                                        free(buf);
                                        goto data_err;
                                }
                                if (cnt <= 0)
                                        continue;
                                len -= cnt;
                                bp += cnt;
                                byte_count += cnt;
                        }
                }
                ENDXFER;
                free(buf);
                reply(226, "Transfer complete.");
                return (0);
        default:
                ENDXFER;
                reply(550, "Unimplemented TYPE %d in send_data.", type);
                return (-1);
        }

data_err:
        ENDXFER;
        perror_reply(426, "Data connection");
        return (-1);

file_err:
        ENDXFER;
        perror_reply(551, "Error on input file");
        return (-1);
}

/*
 * Transfer data from peer to "outstr" using the appropriate encapulation of
 * the data subject to Mode, Structure, and Type.
 *
 * N.B.: Form isn't handled.
 */
static int
receive_data(FILE *instr, FILE *outstr)
{
        int c, cp;
        int bare_lfs = 0;

        STARTXFER;

        switch (type) {

        case TYPE_I:
        case TYPE_L:
                for (;;) {
                        int cnt, len;
                        char *bp;
                        char buf[BUFSIZ];

                        cnt = read(fileno(instr), buf, sizeof(buf));
                        CHECKOOB(return (-1))
                        else if (cnt < 0)
                                goto data_err;
                        if (cnt < 0)    /* resume after OOB */
                                continue;
                        if (cnt == 0)   /* EOF */
                                break;
                        for (len = cnt, bp = buf; len > 0;) {
                                cnt = write(fileno(outstr), bp, len);
                                CHECKOOB(return (-1))
                                else if (cnt < 0)
                                        goto file_err;
                                if (cnt <= 0)
                                        continue;
                                len -= cnt;
                                bp += cnt;
                                byte_count += cnt;
                        }
                }
                ENDXFER;
                return (0);

        case TYPE_E:
                ENDXFER;
                reply(553, "TYPE E not implemented.");
                return (-1);

        case TYPE_A:
                cp = EOF;
                for (;;) {
                        c = getc(instr);
                        CHECKOOB(return (-1))
                        else if (c == EOF && ferror(instr))
                                goto data_err;
                        if (c == EOF && ferror(instr)) { /* resume after OOB */
                                clearerr(instr);
                                continue;
                        }

                        if (cp == '\r') {
                                if (c != '\n')
                                        FTPD_PUTC('\r', outstr, file_err);
                        } else
                                if (c == '\n')
                                        bare_lfs++;
                        if (c == '\r') {
                                byte_count++;
                                cp = c;
                                continue;
                        }

                        /* Check for EOF here in order not to lose last \r. */
                        if (c == EOF) {
                                if (feof(instr))        /* EOF */
                                        break;
                                syslog(LOG_ERR, "Internal: impossible condition"
                                                " on data stream after getc()");
                                goto data_err;
                        }

                        byte_count++;
                        FTPD_PUTC(c, outstr, file_err);
                        cp = c;
                }
#ifdef notyet   /* BSD stdio isn't ready for that */
                while (fflush(outstr) == EOF) {
                        CHECKOOB(return (-1))
                        else
                                goto file_err;
                        clearerr(outstr);
                }
                ENDXFER;
#else
                ENDXFER;
                if (fflush(outstr) == EOF)
                        goto file_err;
#endif
                if (bare_lfs) {
                        lreply(226,
                "WARNING! %d bare linefeeds received in ASCII mode.",
                            bare_lfs);
                (void)printf("   File may not have transferred correctly.\r\n");
                }
                return (0);
        default:
                ENDXFER;
                reply(550, "Unimplemented TYPE %d in receive_data.", type);
                return (-1);
        }

data_err:
        ENDXFER;
        perror_reply(426, "Data connection");
        return (-1);

file_err:
        ENDXFER;
        perror_reply(452, "Error writing to file");
        return (-1);
}

void
statfilecmd(char *filename)
{
        FILE *fin;
        int atstart;
        int c, code;
        char line[LINE_MAX];
        struct stat st;

        code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213;
        (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename);
        fin = ftpd_popen(line, "r");
        if (fin == NULL) {
                perror_reply(551, filename);
                return;
        }
        lreply(code, "Status of %s:", filename);
        atstart = 1;
        while ((c = getc(fin)) != EOF) {
                if (c == '\n') {
                        if (ferror(stdout)){
                                perror_reply(421, "Control connection");
                                (void) ftpd_pclose(fin);
                                dologout(1);
                                /* NOTREACHED */
                        }
                        if (ferror(fin)) {
                                perror_reply(551, filename);
                                (void) ftpd_pclose(fin);
                                return;
                        }
                        (void) putc('\r', stdout);
                }
                /*
                 * RFC 959 says neutral text should be prepended before
                 * a leading 3-digit number followed by whitespace, but
                 * many ftp clients can be confused by any leading digits,
                 * as a matter of fact.
                 */
                if (atstart && isdigit(c))
                        (void) putc(' ', stdout);
                (void) putc(c, stdout);
                atstart = (c == '\n');
        }
        (void) ftpd_pclose(fin);
        reply(code, "End of status.");
}

void
statcmd(void)
{
        union sockunion *su;
        u_char *a, *p;
        char hname[NI_MAXHOST];
        int ispassive;

        if (hostinfo) {
                lreply(211, "%s FTP server status:", hostname);
                printf("     %s\r\n", version);
        } else
                lreply(211, "FTP server status:");
        printf("     Connected to %s", remotehost);
        if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
                         hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) {
                hname[sizeof(hname) - 1] = 0;
                if (strcmp(hname, remotehost) != 0)
                        printf(" (%s)", hname);
        }
        printf("\r\n");
        if (logged_in) {
                if (guest)
                        printf("     Logged in anonymously\r\n");
                else
                        printf("     Logged in as %s\r\n", pw->pw_name);
        } else if (askpasswd)
                printf("     Waiting for password\r\n");
        else
                printf("     Waiting for user name\r\n");
        printf("     TYPE: %s", typenames[type]);
        if (type == TYPE_A || type == TYPE_E)
                printf(", FORM: %s", formnames[form]);
        if (type == TYPE_L)
#if CHAR_BIT == 8
                printf(" %d", CHAR_BIT);
#else
                printf(" %d", bytesize);        /* need definition! */
#endif
        printf("; STRUcture: %s; transfer MODE: %s\r\n",
            strunames[stru], modenames[mode]);
        if (data != -1)
                printf("     Data connection open\r\n");
        else if (pdata != -1) {
                ispassive = 1;
                su = &pasv_addr;
                goto printaddr;
        } else if (usedefault == 0) {
                ispassive = 0;
                su = &data_dest;
printaddr:
#define UC(b) (((int) b) & 0xff)
                if (epsvall) {
                        printf("     EPSV only mode (EPSV ALL)\r\n");
                        goto epsvonly;
                }

                /* PORT/PASV */
                if (su->su_family == AF_INET) {
                        a = (u_char *) &su->su_sin.sin_addr;
                        p = (u_char *) &su->su_sin.sin_port;
                        printf("     %s (%d,%d,%d,%d,%d,%d)\r\n",
                                ispassive ? "PASV" : "PORT",
                                UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
                                UC(p[0]), UC(p[1]));
                }

                /* LPRT/LPSV */
            {
                int alen, af, i;

                switch (su->su_family) {
                case AF_INET:
                        a = (u_char *) &su->su_sin.sin_addr;
                        p = (u_char *) &su->su_sin.sin_port;
                        alen = sizeof(su->su_sin.sin_addr);
                        af = 4;
                        break;
                case AF_INET6:
                        a = (u_char *) &su->su_sin6.sin6_addr;
                        p = (u_char *) &su->su_sin6.sin6_port;
                        alen = sizeof(su->su_sin6.sin6_addr);
                        af = 6;
                        break;
                default:
                        af = 0;
                        break;
                }
                if (af) {
                        printf("     %s (%d,%d,", ispassive ? "LPSV" : "LPRT",
                                af, alen);
                        for (i = 0; i < alen; i++)
                                printf("%d,", UC(a[i]));
                        printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1]));
                }
            }

epsvonly:;
                /* EPRT/EPSV */
            {
                int af;

                switch (su->su_family) {
                case AF_INET:
                        af = 1;
                        break;
                case AF_INET6:
                        af = 2;
                        break;
                default:
                        af = 0;
                        break;
                }
                if (af) {
                        union sockunion tmp;

                        tmp = *su;
                        if (tmp.su_family == AF_INET6)
                                tmp.su_sin6.sin6_scope_id = 0;
                        if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len,
                                        hname, sizeof(hname) - 1, NULL, 0,
                                        NI_NUMERICHOST)) {
                                hname[sizeof(hname) - 1] = 0;
                                printf("     %s |%d|%s|%d|\r\n",
                                        ispassive ? "EPSV" : "EPRT",
                                        af, hname, htons(tmp.su_port));
                        }
                }
            }
#undef UC
        } else
                printf("     No data connection\r\n");
        reply(211, "End of status.");
}

void
fatalerror(char *s)
{

        reply(451, "Error in server: %s", s);
        reply(221, "Closing connection due to server error.");
        dologout(0);
        /* NOTREACHED */
}

void
reply(int n, const char *fmt, ...)
{
        va_list ap;

        (void)printf("%d ", n);
        va_start(ap, fmt);
        (void)vprintf(fmt, ap);
        va_end(ap);
        (void)printf("\r\n");
        (void)fflush(stdout);
        if (ftpdebug) {
                syslog(LOG_DEBUG, "<--- %d ", n);
                va_start(ap, fmt);
                vsyslog(LOG_DEBUG, fmt, ap);
                va_end(ap);
        }
}

void
lreply(int n, const char *fmt, ...)
{
        va_list ap;

        (void)printf("%d- ", n);
        va_start(ap, fmt);
        (void)vprintf(fmt, ap);
        va_end(ap);
        (void)printf("\r\n");
        (void)fflush(stdout);
        if (ftpdebug) {
                syslog(LOG_DEBUG, "<--- %d- ", n);
                va_start(ap, fmt);
                vsyslog(LOG_DEBUG, fmt, ap);
                va_end(ap);
        }
}

static void
ack(char *s)
{

        reply(250, "%s command successful.", s);
}

void
nack(char *s)
{

        reply(502, "%s command not implemented.", s);
}

/* ARGSUSED */
void
yyerror(char *s)
{
        char *cp;

        if ((cp = strchr(cbuf,'\n')))
                *cp = '\0';
        reply(500, "%s: command not understood.", cbuf);
}

void
delete(char *name)
{
        struct stat st;

        LOGCMD("delete", name);
        if (lstat(name, &st) < 0) {
                perror_reply(550, name);
                return;
        }
        if (S_ISDIR(st.st_mode)) {
                if (rmdir(name) < 0) {
                        perror_reply(550, name);
                        return;
                }
                goto done;
        }
        if (guest && noguestmod) {
                reply(550, "Operation not permitted.");
                return;
        }
        if (unlink(name) < 0) {
                perror_reply(550, name);
                return;
        }
done:
        ack("DELE");
}

void
cwd(char *path)
{

        if (chdir(path) < 0)
                perror_reply(550, path);
        else
                ack("CWD");
}

void
makedir(char *name)
{
        char *s;

        LOGCMD("mkdir", name);
        if (guest && noguestmkd)
                reply(550, "Operation not permitted.");
        else if (mkdir(name, 0777) < 0)
                perror_reply(550, name);
        else {
                if ((s = doublequote(name)) == NULL)
                        fatalerror("Ran out of memory.");
                reply(257, "\"%s\" directory created.", s);
                free(s);
        }
}

void
removedir(char *name)
{

        LOGCMD("rmdir", name);
        if (rmdir(name) < 0)
                perror_reply(550, name);
        else
                ack("RMD");
}

void
pwd(void)
{
        char *s, path[MAXPATHLEN + 1];

        if (getcwd(path, sizeof(path)) == NULL)
                perror_reply(550, "Get current directory");
        else {
                if ((s = doublequote(path)) == NULL)
                        fatalerror("Ran out of memory.");
                reply(257, "\"%s\" is current directory.", s);
                free(s);
        }
}

char *
renamefrom(char *name)
{
        struct stat st;

        if (guest && noguestmod) {
                reply(550, "Operation not permitted.");
                return (NULL);
        }
        if (lstat(name, &st) < 0) {
                perror_reply(550, name);
                return (NULL);
        }
        reply(350, "File exists, ready for destination name.");
        return (name);
}

void
renamecmd(char *from, char *to)
{
        struct stat st;

        LOGCMD2("rename", from, to);

        if (guest && (stat(to, &st) == 0)) {
                reply(550, "%s: permission denied.", to);
                return;
        }

        if (rename(from, to) < 0)
                perror_reply(550, "rename");
        else
                ack("RNTO");
}

static void
dolog(struct sockaddr *who)
{
        char who_name[NI_MAXHOST];

        realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len);
        remotehost[sizeof(remotehost) - 1] = 0;
        if (getnameinfo(who, who->sa_len,
                who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST))
                        *who_name = 0;
        who_name[sizeof(who_name) - 1] = 0;

#ifdef SETPROCTITLE
#ifdef VIRTUAL_HOSTING
        if (thishost != firsthost)
                snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)",
                         remotehost, hostname);
        else
#endif
                snprintf(proctitle, sizeof(proctitle), "%s: connected",
                         remotehost);
        setproctitle("%s", proctitle);
#endif /* SETPROCTITLE */

        if (logging) {
#ifdef VIRTUAL_HOSTING
                if (thishost != firsthost)
                        syslog(LOG_INFO, "connection from %s (%s) to %s",
                               remotehost, who_name, hostname);
                else
#endif
                        syslog(LOG_INFO, "connection from %s (%s)",
                               remotehost, who_name);
        }
}

/*
 * Record logout in wtmp file
 * and exit with supplied status.
 */
void
dologout(int status)
{

        if (logged_in && dowtmp) {
                (void) seteuid(0);
#ifdef          LOGIN_CAP
                setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN |
                       LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH |
                       LOGIN_SETENV));
#endif
                ftpd_logwtmp(wtmpid, NULL, NULL);
        }
        /* beware of flushing buffers after a SIGPIPE */
        _exit(status);
}

static void
sigurg(int signo)
{

        recvurg = 1;
}

static void
maskurg(int flag)
{
        int oerrno;
        sigset_t sset;

        if (!transflag) {
                syslog(LOG_ERR, "Internal: maskurg() while no transfer");
                return;
        }
        oerrno = errno;
        sigemptyset(&sset);
        sigaddset(&sset, SIGURG);
        sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL);
        errno = oerrno;
}

static void
flagxfer(int flag)
{

        if (flag) {
                if (transflag)
                        syslog(LOG_ERR, "Internal: flagxfer(1): "
                                        "transfer already under way");
                transflag = 1;
                maskurg(0);
                recvurg = 0;
        } else {
                if (!transflag)
                        syslog(LOG_ERR, "Internal: flagxfer(0): "
                                        "no active transfer");
                maskurg(1);
                transflag = 0;
        }
}

/*
 * Returns 0 if OK to resume or -1 if abort requested.
 */
static int
myoob(void)
{
        char *cp;
        int ret;

        if (!transflag) {
                syslog(LOG_ERR, "Internal: myoob() while no transfer");
                return (0);
        }
        cp = tmpline;
        ret = get_line(cp, 7, stdin);
        if (ret == -1) {
                reply(221, "You could at least say goodbye.");
                dologout(0);
        } else if (ret == -2) {
                /* Ignore truncated command. */
                return (0);
        }
        upper(cp);
        if (strcmp(cp, "ABOR\r\n") == 0) {
                tmpline[0] = '\0';
                reply(426, "Transfer aborted. Data connection closed.");
                reply(226, "Abort successful.");
                return (-1);
        }
        if (strcmp(cp, "STAT\r\n") == 0) {
                tmpline[0] = '\0';
                if (file_size != -1)
                        reply(213, "Status: %jd of %jd bytes transferred.",
                                   (intmax_t)byte_count, (intmax_t)file_size);
                else
                        reply(213, "Status: %jd bytes transferred.",
                                   (intmax_t)byte_count);
        }
        return (0);
}

/*
 * Note: a response of 425 is not mentioned as a possible response to
 *      the PASV command in RFC959. However, it has been blessed as
 *      a legitimate response by Jon Postel in a telephone conversation
 *      with Rick Adams on 25 Jan 89.
 */
void
passive(void)
{
        socklen_t len;
        int on;
        char *p, *a;

        if (pdata >= 0)         /* close old port if one set */
                close(pdata);

        pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
        if (pdata < 0) {
                perror_reply(425, "Can't open passive connection");
                return;
        }
        on = 1;
        if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
                syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");

        (void) seteuid(0);

#ifdef IP_PORTRANGE
        if (ctrl_addr.su_family == AF_INET) {
            on = restricted_data_ports ? IP_PORTRANGE_HIGH
                                       : IP_PORTRANGE_DEFAULT;

            if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
                            &on, sizeof(on)) < 0)
                    goto pasv_error;
        }
#endif
#ifdef IPV6_PORTRANGE
        if (ctrl_addr.su_family == AF_INET6) {
            on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
                                       : IPV6_PORTRANGE_DEFAULT;

            if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
                            &on, sizeof(on)) < 0)
                    goto pasv_error;
        }
#endif

        pasv_addr = ctrl_addr;
        pasv_addr.su_port = 0;
        if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0)
                goto pasv_error;

        (void) seteuid(pw->pw_uid);

        len = sizeof(pasv_addr);
        if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
                goto pasv_error;
        if (listen(pdata, 1) < 0)
                goto pasv_error;
        if (pasv_addr.su_family == AF_INET)
                a = (char *) &pasv_addr.su_sin.sin_addr;
        else if (pasv_addr.su_family == AF_INET6 &&
                 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr))
                a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
        else
                goto pasv_error;
                
        p = (char *) &pasv_addr.su_port;

#define UC(b) (((int) b) & 0xff)

        reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
                UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
        return;

pasv_error:
        (void) seteuid(pw->pw_uid);
        (void) close(pdata);
        pdata = -1;
        perror_reply(425, "Can't open passive connection");
        return;
}

/*
 * Long Passive defined in RFC 1639.
 *     228 Entering Long Passive Mode
 *         (af, hal, h1, h2, h3,..., pal, p1, p2...)
 */

void
long_passive(char *cmd, int pf)
{
        socklen_t len;
        int on;
        char *p, *a;

        if (pdata >= 0)         /* close old port if one set */
                close(pdata);

        if (pf != PF_UNSPEC) {
                if (ctrl_addr.su_family != pf) {
                        switch (ctrl_addr.su_family) {
                        case AF_INET:
                                pf = 1;
                                break;
                        case AF_INET6:
                                pf = 2;
                                break;
                        default:
                                pf = 0;
                                break;
                        }
                        /*
                         * XXX
                         * only EPRT/EPSV ready clients will understand this
                         */
                        if (strcmp(cmd, "EPSV") == 0 && pf) {
                                reply(522, "Network protocol mismatch, "
                                        "use (%d)", pf);
                        } else
                                reply(501, "Network protocol mismatch."); /*XXX*/

                        return;
                }
        }
                
        pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
        if (pdata < 0) {
                perror_reply(425, "Can't open passive connection");
                return;
        }
        on = 1;
        if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
                syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");

        (void) seteuid(0);

        pasv_addr = ctrl_addr;
        pasv_addr.su_port = 0;
        len = pasv_addr.su_len;

#ifdef IP_PORTRANGE
        if (ctrl_addr.su_family == AF_INET) {
            on = restricted_data_ports ? IP_PORTRANGE_HIGH
                                       : IP_PORTRANGE_DEFAULT;

            if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
                            &on, sizeof(on)) < 0)
                    goto pasv_error;
        }
#endif
#ifdef IPV6_PORTRANGE
        if (ctrl_addr.su_family == AF_INET6) {
            on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
                                       : IPV6_PORTRANGE_DEFAULT;

            if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
                            &on, sizeof(on)) < 0)
                    goto pasv_error;
        }
#endif

        if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0)
                goto pasv_error;

        (void) seteuid(pw->pw_uid);

        if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
                goto pasv_error;
        if (listen(pdata, 1) < 0)
                goto pasv_error;

#define UC(b) (((int) b) & 0xff)

        if (strcmp(cmd, "LPSV") == 0) {
                p = (char *)&pasv_addr.su_port;
                switch (pasv_addr.su_family) {
                case AF_INET:
                        a = (char *) &pasv_addr.su_sin.sin_addr;
                v4_reply:
                        reply(228,
"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)",
                              4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
                              2, UC(p[0]), UC(p[1]));
                        return;
                case AF_INET6:
                        if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) {
                                a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
                                goto v4_reply;
                        }
                        a = (char *) &pasv_addr.su_sin6.sin6_addr;
                        reply(228,
"Entering Long Passive Mode "
"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)",
                              6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
                              UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]),
                              UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]),
                              UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]),
                              2, UC(p[0]), UC(p[1]));
                        return;
                }
        } else if (strcmp(cmd, "EPSV") == 0) {
                switch (pasv_addr.su_family) {
                case AF_INET:
                case AF_INET6:
                        reply(229, "Entering Extended Passive Mode (|||%d|)",
                                ntohs(pasv_addr.su_port));
                        return;
                }
        } else {
                /* more proper error code? */
        }

pasv_error:
        (void) seteuid(pw->pw_uid);
        (void) close(pdata);
        pdata = -1;
        perror_reply(425, "Can't open passive connection");
        return;
}

/*
 * Generate unique name for file with basename "local"
 * and open the file in order to avoid possible races.
 * Try "local" first, then "local.1", "local.2" etc, up to "local.99".
 * Return descriptor to the file, set "name" to its name.
 *
 * Generates failure reply on error.
 */
static int
guniquefd(char *local, char **name)
{
        static char new[MAXPATHLEN];
        struct stat st;
        char *cp;
        int count;
        int fd;

        cp = strrchr(local, '/');
        if (cp)
                *cp = '\0';
        if (stat(cp ? local : ".", &st) < 0) {
                perror_reply(553, cp ? local : ".");
                return (-1);
        }
        if (cp) {
                /*
                 * Let not overwrite dirname with counter suffix.
                 * -4 is for /nn\0
                 * In this extreme case dot won't be put in front of suffix.
                 */
                if (strlen(local) > sizeof(new) - 4) {
                        reply(553, "Pathname too long.");
                        return (-1);
                }
                *cp = '/';
        }
        /* -4 is for the .nn<null> we put on the end below */
        (void) snprintf(new, sizeof(new) - 4, "%s", local);
        cp = new + strlen(new);
        /* 
         * Don't generate dotfile unless requested explicitly.
         * This covers the case when basename gets truncated off
         * by buffer size.
         */
        if (cp > new && cp[-1] != '/')
                *cp++ = '.';
        for (count = 0; count < 100; count++) {
                /* At count 0 try unmodified name */
                if (count)
                        (void)sprintf(cp, "%d", count);
                if ((fd = open(count ? new : local,
                    O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) {
                        *name = count ? new : local;
                        return (fd);
                }
                if (errno != EEXIST) {
                        perror_reply(553, count ? new : local);
                        return (-1);
                }
        }
        reply(452, "Unique file name cannot be created.");
        return (-1);
}

/*
 * Format and send reply containing system error number.
 */
void
perror_reply(int code, char *string)
{

        reply(code, "%s: %s.", string, strerror(errno));
}

static char *onefile[] = {
        "",
        0
};

void
send_file_list(char *whichf)
{
        struct stat st;
        DIR *dirp = NULL;
        struct dirent *dir;
        FILE *dout = NULL;
        char **dirlist, *dirname;
        int simple = 0;
        int freeglob = 0;
        glob_t gl;

        if (strpbrk(whichf, "~{[*?") != NULL) {
                int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE;

                memset(&gl, 0, sizeof(gl));
                gl.gl_matchc = MAXGLOBARGS;
                flags |= GLOB_LIMIT;
                freeglob = 1;
                if (glob(whichf, flags, 0, &gl)) {
                        reply(550, "No matching files found.");
                        goto out;
                } else if (gl.gl_pathc == 0) {
                        errno = ENOENT;
                        perror_reply(550, whichf);
                        goto out;
                }
                dirlist = gl.gl_pathv;
        } else {
                onefile[0] = whichf;
                dirlist = onefile;
                simple = 1;
        }

        while ((dirname = *dirlist++)) {
                if (stat(dirname, &st) < 0) {
                        /*
                         * If user typed "ls -l", etc, and the client
                         * used NLST, do what the user meant.
                         */
                        if (dirname[0] == '-' && *dirlist == NULL &&
                            dout == NULL)
                                retrieve(_PATH_LS " %s", dirname);
                        else
                                perror_reply(550, whichf);
                        goto out;
                }

                if (S_ISREG(st.st_mode)) {
                        if (dout == NULL) {
                                dout = dataconn("file list", -1, "w");
                                if (dout == NULL)
                                        goto out;
                                STARTXFER;
                        }
                        START_UNSAFE;
                        fprintf(dout, "%s%s\n", dirname,
                                type == TYPE_A ? "\r" : "");
                        END_UNSAFE;
                        if (ferror(dout))
                                goto data_err;
                        byte_count += strlen(dirname) +
                                      (type == TYPE_A ? 2 : 1);
                        CHECKOOB(goto abrt);
                        continue;
                } else if (!S_ISDIR(st.st_mode))
                        continue;

                if ((dirp = opendir(dirname)) == NULL)
                        continue;

                while ((dir = readdir(dirp)) != NULL) {
                        char nbuf[MAXPATHLEN];

                        CHECKOOB(goto abrt);

#if (defined(__BEOS__) || defined(__HAIKU__))
                        if (dir->d_name[0] == '.' && dir->d_name[1] == '\0')
                                continue;
                        if (dir->d_name[0] == '.' && dir->d_name[1] == '.' &&
                            dir->d_name[2] == '\0')
                                continue;
#else
                        if (dir->d_name[0] == '.' && dir->d_namlen == 1)
                                continue;
                        if (dir->d_name[0] == '.' && dir->d_name[1] == '.' &&
                            dir->d_namlen == 2)
                                continue;
#endif

                        snprintf(nbuf, sizeof(nbuf),
                                "%s/%s", dirname, dir->d_name);

                        /*
                         * We have to do a stat to insure it's
                         * not a directory or special file.
                         */
                        if (simple || (stat(nbuf, &st) == 0 &&
                            S_ISREG(st.st_mode))) {
                                if (dout == NULL) {
                                        dout = dataconn("file list", -1, "w");
                                        if (dout == NULL)
                                                goto out;
                                        STARTXFER;
                                }
                                START_UNSAFE;
                                if (nbuf[0] == '.' && nbuf[1] == '/')
                                        fprintf(dout, "%s%s\n", &nbuf[2],
                                                type == TYPE_A ? "\r" : "");
                                else
                                        fprintf(dout, "%s%s\n", nbuf,
                                                type == TYPE_A ? "\r" : "");
                                END_UNSAFE;
                                if (ferror(dout))
                                        goto data_err;
                                byte_count += strlen(nbuf) +
                                              (type == TYPE_A ? 2 : 1);
                                CHECKOOB(goto abrt);
                        }
                }
                (void) closedir(dirp);
                dirp = NULL;
        }

        if (dout == NULL)
                reply(550, "No files found.");
        else if (ferror(dout))
data_err:       perror_reply(550, "Data connection");
        else
                reply(226, "Transfer complete.");
out:
        if (dout) {
                ENDXFER;
abrt:
                (void) fclose(dout);
                data = -1;
                pdata = -1;
        }
        if (dirp)
                (void) closedir(dirp);
        if (freeglob) {
                freeglob = 0;
                globfree(&gl);
        }
}

void
reapchild(int signo)
{
        while (waitpid(-1, NULL, WNOHANG) > 0);
}

static void
appendf(char **strp, char *fmt, ...)
{
        va_list ap;
        char *ostr, *p;

        va_start(ap, fmt);
        vasprintf(&p, fmt, ap);
        va_end(ap);
        if (p == NULL)
                fatalerror("Ran out of memory.");
        if (*strp == NULL)
                *strp = p;
        else {
                ostr = *strp;
                asprintf(strp, "%s%s", ostr, p);
                if (*strp == NULL)
                        fatalerror("Ran out of memory.");
                free(ostr);
        }
}

static void
logcmd(char *cmd, char *file1, char *file2, off_t cnt)
{
        char *msg = NULL;
        char wd[MAXPATHLEN + 1];

        if (logging <= 1)
                return;

        if (getcwd(wd, sizeof(wd) - 1) == NULL)
                strcpy(wd, strerror(errno));

        appendf(&msg, "%s", cmd);
        if (file1)
                appendf(&msg, " %s", file1);
        if (file2)
                appendf(&msg, " %s", file2);
        if (cnt >= 0)
                appendf(&msg, " = %jd bytes", (intmax_t)cnt);
        appendf(&msg, " (wd: %s", wd);
        if (guest || dochroot)
                appendf(&msg, "; chrooted");
        appendf(&msg, ")");
        syslog(LOG_INFO, "%s", msg);
        free(msg);
}

static void
logxfer(char *name, off_t size, time_t start)
{
        char buf[MAXPATHLEN + 1024];
        char path[MAXPATHLEN + 1];
        time_t now;

        if (statfd >= 0) {
                time(&now);
                if (realpath(name, path) == NULL) {
                        syslog(LOG_NOTICE, "realpath failed on %s: %m", path);
                        return;
                }
                snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n",
                        ctime(&now)+4, ident, remotehost,
                        path, (intmax_t)size,
                        (long)(now - start + (now == start)));
                write(statfd, buf, strlen(buf));
        }
}

static char *
doublequote(char *s)
{
        int n;
        char *p, *s2;

        for (p = s, n = 0; *p; p++)
                if (*p == '"')
                        n++;

        if ((s2 = malloc(p - s + n + 1)) == NULL)
                return (NULL);

        for (p = s2; *s; s++, p++) {
                if ((*p = *s) == '"')
                        *(++p) = '"';
        }
        *p = '\0';

        return (s2);
}

/* setup server socket for specified address family */
/* if af is PF_UNSPEC more than one socket may be returned */
/* the returned list is dynamically allocated, so caller needs to free it */
static int *
socksetup(int af, char *bindname, const char *bindport)
{
        struct addrinfo hints, *res, *r;
        int error, maxs, *s, *socks;
        const int on = 1;

        memset(&hints, 0, sizeof(hints));
        hints.ai_flags = AI_PASSIVE;
        hints.ai_family = af;
        hints.ai_socktype = SOCK_STREAM;
        error = getaddrinfo(bindname, bindport, &hints, &res);
        if (error) {
                syslog(LOG_ERR, "%s", gai_strerror(error));
                if (error == EAI_SYSTEM)
                        syslog(LOG_ERR, "%s", strerror(errno));
                return NULL;
        }

        /* Count max number of sockets we may open */
        for (maxs = 0, r = res; r; r = r->ai_next, maxs++)
                ;
        socks = malloc((maxs + 1) * sizeof(int));
        if (!socks) {
                freeaddrinfo(res);
                syslog(LOG_ERR, "couldn't allocate memory for sockets");
                return NULL;
        }

        *socks = 0;   /* num of sockets counter at start of array */
        s = socks + 1;
        for (r = res; r; r = r->ai_next) {
                *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
                if (*s < 0) {
                        syslog(LOG_DEBUG, "control socket: %m");
                        continue;
                }
                if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
                    &on, sizeof(on)) < 0)
                        syslog(LOG_WARNING,
                            "control setsockopt (SO_REUSEADDR): %m");
                if (r->ai_family == AF_INET6) {
                        if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
                            &on, sizeof(on)) < 0)
                                syslog(LOG_WARNING,
                                    "control setsockopt (IPV6_V6ONLY): %m");
                }
                if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
                        syslog(LOG_DEBUG, "control bind: %m");
                        close(*s);
                        continue;
                }
                (*socks)++;
                s++;
        }

        if (res)
                freeaddrinfo(res);

        if (*socks == 0) {
                syslog(LOG_ERR, "control socket: Couldn't bind to any socket");
                free(socks);
                return NULL;
        }
        return(socks);
}