/*
 * Copyright (c) 1983, 1990, 1992, 1993
 *      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.
 */

#include "rcp_locl.h"
#include <getarg.h>

#define RSH_PROGRAM "rsh"

struct  passwd *pwd;
uid_t   userid;
int     errs, remin, remout;
int     pflag, iamremote, iamrecursive, targetshouldbedirectory;
int     doencrypt, noencrypt;
int     usebroken, usekrb4, usekrb5, forwardtkt;
char    *port;
int     eflag = 0;

#define CMDNEEDS        64
char cmd[CMDNEEDS];             /* must hold "rcp -r -p -d\0" */

int      response (void);
void     rsource (char *, struct stat *);
void     sink (int, char *[]);
void     source (int, char *[]);
void     tolocal (int, char *[]);
void     toremote (char *, int, char *[]);

int      do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);

static int fflag, tflag;

static int version_flag, help_flag;

struct getargs args[] = {
    { NULL,     '4', arg_flag,          &usekrb4,       "use Kerberos 4 authentication" },
    { NULL,     '5', arg_flag,          &usekrb5,       "use Kerberos 5 authentication" },
    { NULL,     'F', arg_flag,          &forwardtkt,    "forward credentials" },
    { NULL,     'K', arg_flag,          &usebroken,     "use BSD authentication" },
    { NULL,     'P', arg_string,        &port,          "non-default port", "port" },
    { NULL,     'p', arg_flag,          &pflag, "preserve file permissions" },
    { NULL,     'r', arg_flag,          &iamrecursive,  "recursive mode" },
    { NULL,     'x', arg_flag,          &doencrypt,     "use encryption" },
    { NULL,     'z', arg_flag,          &noencrypt,     "don't encrypt" },
    { NULL,     'd', arg_flag,          &targetshouldbedirectory },
    { NULL,     'e', arg_flag,          &eflag,         "passed to rsh" },
    { NULL,     'f', arg_flag,          &fflag },
    { NULL,     't', arg_flag,          &tflag },
    { "version", 0,  arg_flag,          &version_flag },
    { "help",    0,  arg_flag,          &help_flag }
};

static void
usage (int ret)
{
    arg_printusage (args,
                    sizeof(args) / sizeof(args[0]),
                    NULL,
                    "file1 file2|file... directory");
    exit (ret);
}

int
main(int argc, char **argv)
{
        char *targ;
        int optind = 0;

        setprogname(argv[0]);
        if (getarg (args, sizeof(args) / sizeof(args[0]), argc, argv,
                    &optind))
            usage (1);
        if(help_flag)
            usage(0);
        if (version_flag) {
            print_version (NULL);
            return 0;
        }

        iamremote = (fflag || tflag);

        argc -= optind;
        argv += optind;

        if ((pwd = getpwuid(userid = getuid())) == NULL)
                errx(1, "unknown user %d", (int)userid);

        remin = STDIN_FILENO;           /* XXX */
        remout = STDOUT_FILENO;

        if (fflag) {                    /* Follow "protocol", send data. */
                (void)response();
                source(argc, argv);
                exit(errs);
        }

        if (tflag) {                    /* Receive data. */
                sink(argc, argv);
                exit(errs);
        }

        if (argc < 2)
            usage(1);
        if (argc > 2)
                targetshouldbedirectory = 1;

        remin = remout = -1;
        /* Command to be executed on remote system using "rsh". */
        snprintf(cmd, sizeof(cmd),
                 "rcp%s%s%s", iamrecursive ? " -r" : "",
                 pflag ? " -p" : "", targetshouldbedirectory ? " -d" : "");

        signal(SIGPIPE, lostconn);

        if ((targ = colon(argv[argc - 1])))     /* Dest is remote host. */
                toremote(targ, argc, argv);
        else {
                tolocal(argc, argv);            /* Dest is local host. */
                if (targetshouldbedirectory)
                        verifydir(argv[argc - 1]);
        }
        exit(errs);
}

void
toremote(char *targ, int argc, char **argv)
{
        int i;
        char *bp, *host, *src, *suser, *thost, *tuser;

        *targ++ = 0;
        if (*targ == 0)
                targ = ".";

        if ((thost = strchr(argv[argc - 1], '@')) != NULL) {
                /* user@host */
                *thost++ = 0;
                tuser = argv[argc - 1];
                if (*tuser == '\0')
                        tuser = NULL;
                else if (!okname(tuser))
                        exit(1);
        } else {
                thost = argv[argc - 1];
                tuser = NULL;
        }
        thost = unbracket(thost);

        for (i = 0; i < argc - 1; i++) {
                src = colon(argv[i]);
                if (src) {                      /* remote to remote */
                        int ret;
                        *src++ = 0;
                        if (*src == 0)
                                src = ".";
                        host = strchr(argv[i], '@');
                        if (host) {
                                *host++ = '\0';
                                host = unbracket(host);
                                suser = argv[i];
                                if (*suser == '\0')
                                        suser = pwd->pw_name;
                                else if (!okname(suser))
                                        continue;
                                ret = asprintf(&bp,
                                    "%s%s %s -l %s -n %s %s '%s%s%s:%s'",
                                         _PATH_RSH, eflag ? " -e" : "",
                                         host, suser, cmd, src,
                                    tuser ? tuser : "", tuser ? "@" : "",
                                    thost, targ);
                        } else {
                                host = unbracket(argv[i]);
                                ret = asprintf(&bp,
                                         "exec %s%s %s -n %s %s '%s%s%s:%s'",
                                         _PATH_RSH, eflag ? " -e" : "",
                                         host, cmd, src,
                                         tuser ? tuser : "", tuser ? "@" : "",
                                         thost, targ);
                        }
                        if (ret == -1)
                                err (1, "malloc");
                        susystem(bp);
                        free(bp);
                } else {                        /* local to remote */
                        if (remin == -1) {
                                if (asprintf(&bp, "%s -t %s", cmd, targ) == -1)
                                        err (1, "malloc");
                                host = thost;

                                if (do_cmd(host, tuser, bp, &remin, &remout) < 0)
                                        exit(1);

                                if (response() < 0)
                                        exit(1);
                                free(bp);
                        }
                        source(1, argv+i);
                }
        }
}

void
tolocal(int argc, char **argv)
{
        int i;
        char *bp, *host, *src, *suser;

        for (i = 0; i < argc - 1; i++) {
                int ret;

                if (!(src = colon(argv[i]))) {          /* Local to local. */
                        ret = asprintf(&bp, "exec %s%s%s %s %s", _PATH_CP,
                            iamrecursive ? " -PR" : "", pflag ? " -p" : "",
                            argv[i], argv[argc - 1]);
                        if (ret == -1)
                                err (1, "malloc");
                        if (susystem(bp))
                                ++errs;
                        free(bp);
                        continue;
                }
                *src++ = 0;
                if (*src == 0)
                        src = ".";
                if ((host = strchr(argv[i], '@')) == NULL) {
                        host = argv[i];
                        suser = pwd->pw_name;
                } else {
                        *host++ = 0;
                        suser = argv[i];
                        if (*suser == '\0')
                                suser = pwd->pw_name;
                        else if (!okname(suser))
                                continue;
                }
                ret = asprintf(&bp, "%s -f %s", cmd, src);
                if (ret == -1)
                        err (1, "malloc");
                if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
                        free(bp);
                        ++errs;
                        continue;
                }
                free(bp);
                sink(1, argv + argc - 1);
                close(remin);
                remin = remout = -1;
        }
}

void
source(int argc, char **argv)
{
        struct stat stb;
        static BUF buffer;
        BUF *bp;
        off_t i;
        off_t amt;
        int fd, haderr, indx, result;
        char *last, *name, buf[BUFSIZ];

        for (indx = 0; indx < argc; ++indx) {
                name = argv[indx];
                if ((fd = open(name, O_RDONLY, 0)) < 0)
                        goto syserr;
                if (fstat(fd, &stb)) {
syserr:                 run_err("%s: %s", name, strerror(errno));
                        goto next;
                }
                if (S_ISDIR(stb.st_mode) && iamrecursive) {
                        rsource(name, &stb);
                        goto next;
                } else if (!S_ISREG(stb.st_mode)) {
                        run_err("%s: not a regular file", name);
                        goto next;
                }
                if ((last = strrchr(name, '/')) == NULL)
                        last = name;
                else
                        ++last;
                if (pflag) {
                        /*
                         * Make it compatible with possible future
                         * versions expecting microseconds.
                         */
                        snprintf(buf, sizeof(buf), "T%ld 0 %ld 0\n",
                            (long)stb.st_mtime,
                            (long)stb.st_atime);
                        write(remout, buf, strlen(buf));
                        if (response() < 0)
                                goto next;
                }
#undef MODEMASK
#define MODEMASK        (S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO)
                snprintf(buf, sizeof(buf), "C%04o %lu %s\n",
                         (unsigned int)(stb.st_mode & MODEMASK),
                         (unsigned long)stb.st_size,
                         last);
                write(remout, buf, strlen(buf));
                if (response() < 0)
                        goto next;
                if ((bp = allocbuf(&buffer, fd, BUFSIZ)) == NULL) {
next:                   close(fd);
                        continue;
                }

                /* Keep writing after an error so that we stay sync'd up. */
                for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
                        amt = bp->cnt;
                        if (i + amt > stb.st_size)
                                amt = stb.st_size - i;
                        if (!haderr) {
                                result = read(fd, bp->buf, (size_t)amt);
                                if (result != amt)
                                        haderr = result >= 0 ? EIO : errno;
                        }
                        if (haderr)
                                write(remout, bp->buf, amt);
                        else {
                                result = write(remout, bp->buf, (size_t)amt);
                                if (result != amt)
                                        haderr = result >= 0 ? EIO : errno;
                        }
                }
                if (close(fd) && !haderr)
                        haderr = errno;
                if (!haderr)
                        write(remout, "", 1);
                else
                        run_err("%s: %s", name, strerror(haderr));
                response();
        }
}

void
rsource(char *name, struct stat *statp)
{
        DIR *dirp;
        struct dirent *dp;
        char *last, *vect[1], path[MAXPATHLEN];

        if (!(dirp = opendir(name))) {
                run_err("%s: %s", name, strerror(errno));
                return;
        }
        last = strrchr(name, '/');
        if (last == 0)
                last = name;
        else
                last++;
        if (pflag) {
                snprintf(path, sizeof(path), "T%ld 0 %ld 0\n",
                    (long)statp->st_mtime,
                    (long)statp->st_atime);
                write(remout, path, strlen(path));
                if (response() < 0) {
                        closedir(dirp);
                        return;
                }
        }
        snprintf(path, sizeof(path),
                 "D%04o %d %s\n",
                 (unsigned int)(statp->st_mode & MODEMASK), 0, last);
        write(remout, path, strlen(path));
        if (response() < 0) {
                closedir(dirp);
                return;
        }
        while ((dp = readdir(dirp)) != NULL) {
                if (dp->d_ino == 0)
                        continue;
                if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
                        continue;
                if (strlen(name) + 1 + strlen(dp->d_name) >= MAXPATHLEN - 1) {
                        run_err("%s/%s: name too long", name, dp->d_name);
                        continue;
                }
                snprintf(path, sizeof(path), "%s/%s", name, dp->d_name);
                vect[0] = path;
                source(1, vect);
        }
        closedir(dirp);
        write(remout, "E\n", 2);
        response();
}

void
sink(int argc, char **argv)
{
        static BUF buffer;
        struct stat stb;
        struct timeval tv[2];
        enum { YES, NO, DISPLAYED } wrerr;
        BUF *bp;
        off_t i, j, size;
        int amt, count, exists, first, mask, mode, ofd, omode;
        int setimes, targisdir, wrerrno = 0;
        char ch, *cp, *np, *targ, *why, *vect[1], buf[BUFSIZ];

#define atime   tv[0]
#define mtime   tv[1]
#define SCREWUP(str)    { why = str; goto screwup; }

        setimes = targisdir = 0;
        mask = umask(0);
        if (!pflag)
                umask(mask);
        if (argc != 1) {
                run_err("ambiguous target");
                exit(1);
        }
        targ = *argv;
        if (targetshouldbedirectory)
                verifydir(targ);
        write(remout, "", 1);
        if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
                targisdir = 1;
        for (first = 1;; first = 0) {
                cp = buf;
                if (read(remin, cp, 1) <= 0)
                        return;
                if (*cp++ == '\n')
                        SCREWUP("unexpected <newline>");
                do {
                        if (read(remin, &ch, sizeof(ch)) != sizeof(ch))
                                SCREWUP("lost connection");
                        *cp++ = ch;
                } while (cp < &buf[BUFSIZ - 1] && ch != '\n');
                *cp = 0;

                if (buf[0] == '\01' || buf[0] == '\02') {
                        if (iamremote == 0)
                                write(STDERR_FILENO,
                                    buf + 1, strlen(buf + 1));
                        if (buf[0] == '\02')
                                exit(1);
                        ++errs;
                        continue;
                }
                if (buf[0] == 'E') {
                        write(remout, "", 1);
                        return;
                }

                if (ch == '\n')
                        *--cp = 0;

                cp = buf;
                if (*cp == 'T') {
                        setimes++;
                        cp++;
                        mtime.tv_sec = strtol(cp, &cp, 10);
                        if (!cp || *cp++ != ' ')
                                SCREWUP("mtime.sec not delimited");
                        mtime.tv_usec = strtol(cp, &cp, 10);
                        if (!cp || *cp++ != ' ')
                                SCREWUP("mtime.usec not delimited");
                        atime.tv_sec = strtol(cp, &cp, 10);
                        if (!cp || *cp++ != ' ')
                                SCREWUP("atime.sec not delimited");
                        atime.tv_usec = strtol(cp, &cp, 10);
                        if (!cp || *cp++ != '\0')
                                SCREWUP("atime.usec not delimited");
                        write(remout, "", 1);
                        continue;
                }
                if (*cp != 'C' && *cp != 'D') {
                        /*
                         * Check for the case "rcp remote:foo\* local:bar".
                         * In this case, the line "No match." can be returned
                         * by the shell before the rcp command on the remote is
                         * executed so the ^Aerror_message convention isn't
                         * followed.
                         */
                        if (first) {
                                run_err("%s", cp);
                                exit(1);
                        }
                        SCREWUP("expected control record");
                }
                mode = 0;
                for (++cp; cp < buf + 5; cp++) {
                        if (*cp < '0' || *cp > '7')
                                SCREWUP("bad mode");
                        mode = (mode << 3) | (*cp - '0');
                }
                if (*cp++ != ' ')
                        SCREWUP("mode not delimited");

                for (size = 0; isdigit((unsigned char)*cp);)
                        size = size * 10 + (*cp++ - '0');
                if (*cp++ != ' ')
                        SCREWUP("size not delimited");
                if (targisdir) {
                        static char *namebuf;
                        static int cursize;
                        size_t need;

                        need = strlen(targ) + strlen(cp) + 250;
                        if (need > cursize) {
                                if (!(namebuf = malloc(need)))
                                        run_err("%s", strerror(errno));
                        }
                        snprintf(namebuf, need, "%s%s%s", targ,
                            *targ ? "/" : "", cp);
                        np = namebuf;
                } else
                        np = targ;
                exists = stat(np, &stb) == 0;
                if (buf[0] == 'D') {
                        int mod_flag = pflag;
                        if (exists) {
                                if (!S_ISDIR(stb.st_mode)) {
                                        errno = ENOTDIR;
                                        goto bad;
                                }
                                if (pflag)
                                        chmod(np, mode);
                        } else {
                                /* Handle copying from a read-only directory */
                                mod_flag = 1;
                                if (mkdir(np, mode | S_IRWXU) < 0)
                                        goto bad;
                        }
                        vect[0] = np;
                        sink(1, vect);
                        if (setimes) {
                                setimes = 0;
                                if (utimes(np, tv) < 0)
                                    run_err("%s: set times: %s",
                                        np, strerror(errno));
                        }
                        if (mod_flag)
                                chmod(np, mode);
                        continue;
                }
                omode = mode;
                mode |= S_IWRITE;
                if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
bad:                    run_err("%s: %s", np, strerror(errno));
                        continue;
                }
                write(remout, "", 1);
                if ((bp = allocbuf(&buffer, ofd, BUFSIZ)) == NULL) {
                        close(ofd);
                        continue;
                }
                cp = bp->buf;
                wrerr = NO;
                for (count = i = 0; i < size; i += BUFSIZ) {
                        amt = BUFSIZ;
                        if (i + amt > size)
                                amt = size - i;
                        count += amt;
                        if((j = net_read(remin, cp, amt)) != amt) {
                            run_err("%s", j ? strerror(errno) :
                                    "dropped connection");
                            exit(1);
                        }
                        amt -= j;
                        cp += j;
                        if (count == bp->cnt) {
                                /* Keep reading so we stay sync'd up. */
                                if (wrerr == NO) {
                                        j = write(ofd, bp->buf, (size_t)count);
                                        if (j != count) {
                                                wrerr = YES;
                                                wrerrno = j >= 0 ? EIO : errno;
                                        }
                                }
                                count = 0;
                                cp = bp->buf;
                        }
                }
                if (count != 0 && wrerr == NO &&
                    (j = write(ofd, bp->buf, (size_t)count)) != count) {
                        wrerr = YES;
                        wrerrno = j >= 0 ? EIO : errno;
                }
                if (ftruncate(ofd, size)) {
                        run_err("%s: truncate: %s", np, strerror(errno));
                        wrerr = DISPLAYED;
                }
                if (pflag) {
                        if (exists || omode != mode)
                                if (fchmod(ofd, omode))
                                        run_err("%s: set mode: %s",
                                            np, strerror(errno));
                } else {
                        if (!exists && omode != mode)
                                if (fchmod(ofd, omode & ~mask))
                                        run_err("%s: set mode: %s",
                                            np, strerror(errno));
                }
                close(ofd);
                response();
                if (setimes && wrerr == NO) {
                        setimes = 0;
                        if (utimes(np, tv) < 0) {
                                run_err("%s: set times: %s",
                                    np, strerror(errno));
                                wrerr = DISPLAYED;
                        }
                }
                switch(wrerr) {
                case YES:
                        run_err("%s: %s", np, strerror(wrerrno));
                        break;
                case NO:
                        write(remout, "", 1);
                        break;
                case DISPLAYED:
                        break;
                }
        }
screwup:
        run_err("protocol error: %s", why);
        exit(1);
}

int
response(void)
{
        char ch, *cp, resp, rbuf[BUFSIZ];

        if (read(remin, &resp, sizeof(resp)) != sizeof(resp))
                lostconn(0);

        cp = rbuf;
        switch(resp) {
        case 0:                         /* ok */
                return (0);
        default:
                *cp++ = resp;
                /* FALLTHROUGH */
        case 1:                         /* error, followed by error msg */
        case 2:                         /* fatal error, "" */
                do {
                        if (read(remin, &ch, sizeof(ch)) != sizeof(ch))
                                lostconn(0);
                        *cp++ = ch;
                } while (cp < &rbuf[BUFSIZ] && ch != '\n');

                if (!iamremote)
                        write(STDERR_FILENO, rbuf, cp - rbuf);
                ++errs;
                if (resp == 1)
                        return (-1);
                exit(1);
        }
        /* NOTREACHED */
}

#include <stdarg.h>

void
run_err(const char *fmt, ...)
{
        static FILE *fp;
        va_list ap;

        ++errs;
        if (fp == NULL && !(fp = fdopen(remout, "w")))
                return;
        va_start(ap, fmt);
        fprintf(fp, "%c", 0x01);
        fprintf(fp, "rcp: ");
        vfprintf(fp, fmt, ap);
        fprintf(fp, "\n");
        fflush(fp);
        va_end(ap);

        if (!iamremote) {
            va_start(ap, fmt);
            vwarnx(fmt, ap);
            va_end(ap);
        }
}

/*
 * This function executes the given command as the specified user on the
 * given host.  This returns < 0 if execution fails, and >= 0 otherwise. This
 * assigns the input and output file descriptors on success.
 *
 * If it cannot create necessary pipes it exits with error message.
 */

int
do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout)
{
        int pin[2], pout[2], reserved[2];

        /*
         * Reserve two descriptors so that the real pipes won't get
         * descriptors 0 and 1 because that will screw up dup2 below.
         */
        pipe(reserved);

        /* Create a socket pair for communicating with rsh. */
        if (pipe(pin) < 0) {
                perror("pipe");
                exit(255);
        }
        if (pipe(pout) < 0) {
                perror("pipe");
                exit(255);
        }

        /* Free the reserved descriptors. */
        close(reserved[0]);
        close(reserved[1]);

        /* For a child to execute the command on the remote host using rsh. */
        if (fork() == 0) {
                char *args[100];
                unsigned int i;

                /* Child. */
                close(pin[1]);
                close(pout[0]);
                dup2(pin[0], 0);
                dup2(pout[1], 1);
                close(pin[0]);
                close(pout[1]);

                i = 0;
                args[i++] = RSH_PROGRAM;
                if (usekrb4)
                        args[i++] = "-4";
                if (usekrb5)
                        args[i++] = "-5";
                if (usebroken)
                        args[i++] = "-K";
                if (doencrypt)
                        args[i++] = "-x";
                if (forwardtkt)
                        args[i++] = "-F";
                if (noencrypt)
                        args[i++] = "-z";
                if (port != NULL) {
                        args[i++] = "-p";
                        args[i++] = port;
                }
                if (eflag)
                    args[i++] = "-e";
                if (remuser != NULL) {
                        args[i++] = "-l";
                        args[i++] = remuser;
                }
                args[i++] = host;
                args[i++] = cmd;
                args[i++] = NULL;

                execvp(RSH_PROGRAM, args);
                perror(RSH_PROGRAM);
                exit(1);
        }
        /* Parent.  Close the other side, and return the local side. */
        close(pin[0]);
        *fdout = pin[1];
        close(pout[1]);
        *fdin = pout[0];
        return 0;
}