/*      $NetBSD: docmd.c,v 1.30 2013/10/18 20:43:45 christos Exp $      */

/*
 * Copyright (c) 1983, 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 <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)docmd.c     8.1 (Berkeley) 6/9/93";
#else
__RCSID("$NetBSD: docmd.c,v 1.30 2013/10/18 20:43:45 christos Exp $");
#endif
#endif /* not lint */

#include <sys/types.h>
#include <sys/ioctl.h>

#include <errno.h>
#include <netdb.h>
#include <regex.h>
#include <setjmp.h>
#include <fcntl.h>

#include "defs.h"

FILE    *lfp;                   /* log file for recording files updated */
struct  subcmd *subcmds;        /* list of sub-commands for current cmd */
jmp_buf env;

static int       remerr = -1;   /* Remote stderr */

static int       makeconn(char *);
static int       okname(char *);
static void      closeconn(void);
static void      cmptime(char *);
static void      doarrow(char **,
                    struct namelist *, char *, struct subcmd *);
static void      dodcolon(char **,
                    struct namelist *, char *, struct subcmd *);
static void      notify(char *, char *, struct namelist *, time_t);
static void      rcmptime(struct stat *);

/*
 * Do the commands in cmds (initialized by yyparse).
 */
void
docmds(char **dhosts, int argc, char **argv)
{
        struct cmd *c;
        struct namelist *f;
        char **cpp;
        extern struct cmd *cmds;

        signal(SIGHUP, cleanup);
        signal(SIGINT, cleanup);
        signal(SIGQUIT, cleanup);
        signal(SIGTERM, cleanup);

        for (c = cmds; c != NULL; c = c->c_next) {
                if (dhosts != NULL && *dhosts != NULL) {
                        for (cpp = dhosts; *cpp; cpp++)
                                if (strcmp(c->c_name, *cpp) == 0)
                                        goto fndhost;
                        continue;
                }
        fndhost:
                if (argc) {
                        for (cpp = argv; *cpp; cpp++) {
                                if (c->c_label != NULL &&
                                    strcmp(c->c_label, *cpp) == 0) {
                                        cpp = NULL;
                                        goto found;
                                }
                                for (f = c->c_files; f != NULL; f = f->n_next)
                                        if (strcmp(f->n_name, *cpp) == 0)
                                                goto found;
                        }
                        continue;
                } else
                        cpp = NULL;
        found:
                switch (c->c_type) {
                case ARROW:
                        doarrow(cpp, c->c_files, c->c_name, c->c_cmds);
                        break;
                case DCOLON:
                        dodcolon(cpp, c->c_files, c->c_name, c->c_cmds);
                        break;
                default:
                        fatal("illegal command type %d\n", c->c_type);
                }
        }
        closeconn();
}

/*
 * Process commands for sending files to other machines.
 */
static void
doarrow(char **filev, struct namelist *xfiles, char *rhost,
    struct subcmd *xcmds)
{
        struct namelist *f;
        struct subcmd *sc;
        char **cpp;
        int n;
        int volatile ddir;
        int volatile opts;
        struct namelist * volatile files = xfiles;
        struct subcmd * volatile cmds = xcmds;

        opts = options;
        if (debug)
                printf("doarrow(%lx, %s, %lx)\n",
                    (long)files, rhost, (long)cmds);

        if (files == NULL) {
                error("no files to be updated\n");
                return;
        }

        subcmds = cmds;
        ddir = files->n_next != NULL;   /* destination is a directory */
        if (nflag)
                printf("updating host %s\n", rhost);
        else {
                if (setjmp(env))
                        goto done;
                signal(SIGPIPE, lostconn);
                if (!makeconn(rhost))
                        return;
                if ((lfp = fopen(tempfile, "w")) == NULL) {
                        fatal("cannot open %s\n", tempfile);
                        exit(1);
                }
        }
        for (f = files; f != NULL; f = f->n_next) {
                if (filev) {
                        for (cpp = filev; *cpp; cpp++)
                                if (strcmp(f->n_name, *cpp) == 0)
                                        goto found;
                        if (!nflag && lfp)
                                (void) fclose(lfp);
                        continue;
                }
        found:
                n = 0;
                for (sc = cmds; sc != NULL; sc = sc->sc_next) {
                        if (sc->sc_type != INSTALL)
                                continue;
                        n++;
                        install(f->n_name, sc->sc_name,
                                sc->sc_name == NULL ? 0 : ddir, sc->sc_options);
                        opts = sc->sc_options;
                }
                if (n == 0)
                        install(f->n_name, NULL, 0, options);
        }
done:
        if (!nflag) {
                (void) signal(SIGPIPE, cleanup);
                if (lfp)
                        (void) fclose(lfp);
                lfp = NULL;
        }
        for (sc = cmds; sc != NULL; sc = sc->sc_next)
                if (sc->sc_type == NOTIFY)
                        notify(tempfile, rhost, sc->sc_args, 0);
        if (!nflag) {
                for (; ihead != NULL; ihead = ihead->nextp) {
                        free(ihead);
                        if ((opts & IGNLNKS) || ihead->count == 0)
                                continue;
                        if (lfp)
                                dolog(lfp, "%s: Warning: missing links\n",
                                        ihead->pathname);
                }
        }
}

/*
 * Create a connection to the rdist server on the machine rhost.
 */
static int
makeconn(char *rhost)
{
        char *ruser, *cp;
        static char *cur_host = NULL;
        static int port = -1;
        char tuser[20];
        int n;
        extern char user[];

        if (debug)
                printf("makeconn(%s)\n", rhost);

        if (cur_host != NULL && rem >= 0) {
                if (strcmp(cur_host, rhost) == 0)
                        return(1);
                closeconn();
        }
        cur_host = rhost;
        cp = strchr(rhost, '@');
        if (cp != NULL) {
                char c = *cp;

                *cp = '\0';
                if (strlcpy(tuser, rhost, sizeof(tuser)) >= sizeof(tuser)) {
                        *cp = c;
                        return(0);
                }
                *cp = c;
                rhost = cp + 1;
                ruser = tuser;
                if (*ruser == '\0')
                        ruser = user;
                else if (!okname(ruser))
                        return(0);
        } else
                ruser = user;
        if (!qflag)
                printf("updating host %s\n", rhost);
        (void) snprintf(buf, sizeof(buf), "%s -Server%s", _PATH_RDIST,
            qflag ? " -q" : "");
        if (port < 0) {
                struct servent *sp;

                if ((sp = getservbyname("shell", "tcp")) == NULL)
                        fatal("shell/tcp: unknown service");
                port = sp->s_port;
        }

        if (debug) {
                printf("port = %d, luser = %s, ruser = %s\n", ntohs(port), user, ruser);
                printf("buf = %s\n", buf);
        }

        fflush(stdout);
        seteuid(0);
        rem = rcmd(&rhost, port, user, ruser, buf, &remerr);
        seteuid(userid);
        if (rem < 0)
                return(0);
        cp = buf;
        if (read(rem, cp, 1) != 1)
                lostconn(0);
        if (*cp == 'V') {
                do {
                        if (read(rem, cp, 1) != 1)
                                lostconn(0);
                } while (*cp++ != '\n' && cp < &buf[BUFSIZ]);
                *--cp = '\0';
                cp = buf;
                n = 0;
                while (*cp >= '0' && *cp <= '9')
                        n = (n * 10) + (*cp++ - '0');
                if (*cp == '\0' && n == VERSION)
                        return(1);
                error("connection failed: version numbers don't match (local %d, remote %d)\n", VERSION, n);
        } else {
                error("connection failed: version numbers don't match\n");
                error("got unexpected input:");
                do {
                        error("%c", *cp);
                } while (*cp != '\n' && read(rem, cp, 1) == 1);
        }
        closeconn();
        return(0);
}

/*
 * Signal end of previous connection.
 */
static void
closeconn(void)
{
        if (debug)
                printf("closeconn()\n");

        if (rem >= 0) {
                if (write(rem, "\2\n", 2) < 0 && debug)
                        printf("write failed on fd %d: %s\n", rem,
                            strerror(errno));
                (void) close(rem);
                (void) close(remerr);
                rem = -1;
                remerr = -1;
        }
}

void
/*ARGSUSED*/
lostconn(int signo __unused)
{
        char lcbuf[BUFSIZ];
        int nr = -1;

        if (remerr != -1)
                if (ioctl(remerr, FIONREAD, &nr) != -1) {
                        if (nr >= (int)sizeof(lcbuf))
                                nr = sizeof(lcbuf) - 1;
                        if ((nr = read(remerr, lcbuf, nr)) > 0) {
                                lcbuf[nr] = '\0';
                                if (lcbuf[nr - 1] == '\n')
                                        lcbuf[--nr] = '\0';
                        }
                }

        if (nr <= 0)
                (void) strlcpy(lcbuf, "lost connection", sizeof(lcbuf));

        if (iamremote)
                cleanup(0);
        if (lfp)
                dolog(lfp, "rdist: %s\n", lcbuf);
        else
                error("%s\n", lcbuf);
        longjmp(env, 1);
}

static int
okname(char *name)
{
        char *cp = name;
        int c;

        do {
                c = *cp;
                if (c & 0200)
                        goto bad;
                if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
                        goto bad;
                cp++;
        } while (*cp);
        return(1);
bad:
        error("invalid user name %s\n", name);
        return(0);
}

time_t  lastmod;
FILE    *tfp;
extern  char target[], *tp;

/*
 * Process commands for comparing files to time stamp files.
 */
static void
dodcolon(char **filev, struct namelist *files, char *stamp, struct subcmd *cmds)
{
        struct subcmd *sc;
        struct namelist *f;
        char **cpp;
        struct timeval tv[2];
        struct stat stb;

        if (debug)
                printf("dodcolon()\n");

        if (files == NULL) {
                error("no files to be updated\n");
                return;
        }
        if (stat(stamp, &stb) < 0) {
                error("%s: %s\n", stamp, strerror(errno));
                return;
        }
        if (debug)
                printf("%s: %lu\n", stamp, (u_long)stb.st_mtime);

        subcmds = cmds;
        lastmod = stb.st_mtime;
        if (nflag || (options & VERIFY))
                tfp = NULL;
        else {
                if ((tfp = fopen(tempfile, "w")) == NULL) {
                        error("%s: %s\n", tempfile, strerror(errno));
                        return;
                }
                (void) gettimeofday(&tv[0], (struct timezone *)0);
                tv[1] = tv[0];
                (void) utimes(stamp, tv);
        }

        for (f = files; f != NULL; f = f->n_next) {
                if (filev) {
                        for (cpp = filev; *cpp; cpp++)
                                if (strcmp(f->n_name, *cpp) == 0)
                                        goto found;
                        continue;
                }
        found:
                tp = NULL;
                cmptime(f->n_name);
        }

        if (tfp != NULL)
                (void) fclose(tfp);
        for (sc = cmds; sc != NULL; sc = sc->sc_next)
                if (sc->sc_type == NOTIFY)
                        notify(tempfile, NULL, sc->sc_args, lastmod);
}

/*
 * Compare the mtime of file to the list of time stamps.
 */
static void
cmptime(char *name)
{
        struct stat stb;

        if (debug)
                printf("cmptime(%s)\n", name);

        if (except(name))
                return;

        if (nflag) {
                printf("comparing dates: %s\n", name);
                return;
        }

        /*
         * first time cmptime() is called?
         */
        if (tp == NULL) {
                if (exptilde(target, name) == NULL)
                        return;
                tp = name = target;
                while (*tp)
                        tp++;
        }
        if (access(name, 4) < 0 || stat(name, &stb) < 0) {
                error("%s: %s\n", name, strerror(errno));
                return;
        }

        switch (stb.st_mode & S_IFMT) {
        case S_IFREG:
                break;

        case S_IFDIR:
                rcmptime(&stb);
                return;

        default:
                error("%s: not a plain file\n", name);
                return;
        }

        if (stb.st_mtime > lastmod)
                dolog(tfp, "new: %s\n", name);
}

static void
rcmptime(struct stat *st)
{
        DIR *d;
        struct dirent *dp;
        char *cp;
        char *otp;
        int len;

        if (debug)
                printf("rcmptime(%lx)\n", (long)st);

        if ((d = opendir(target)) == NULL) {
                error("%s: %s\n", target, strerror(errno));
                return;
        }
        otp = tp;
        len = tp - target;
        while ((dp = readdir(d)) != NULL) {
                if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
                        continue;
                if (len + 1 + strlen(dp->d_name) >= BUFSIZ - 1) {
                        error("%s/%s: Name too long\n", target, dp->d_name);
                        continue;
                }
                tp = otp;
                *tp++ = '/';
                cp = dp->d_name;
                while ((*tp++ = *cp++) != 0)
                        ;
                tp--;
                cmptime(target);
        }
        closedir(d);
        tp = otp;
        *tp = '\0';
}

/*
 * Notify the list of people the changes that were made.
 * rhost == NULL if we are mailing a list of changes compared to at time
 * stamp file.
 */
static void
notify(char *file, char *rhost, struct namelist *to, time_t lmod)
{
        int fd, len;
        struct stat stb;
        FILE *pf;
        char *cp, *nrhost = rhost;

        if ((options & VERIFY) || to == NULL)
                return;

        /* strip any leading user@ prefix from rhost */
        if (rhost && (cp = strchr(rhost, '@')) != NULL)
                nrhost = cp + 1;

        if (!qflag) {
                printf("notify ");
                if (rhost)
                        printf("@%s ", nrhost);
                prnames(to);
        }
        if (nflag)
                return;

        if ((fd = open(file, 0)) < 0) {
                error("%s: %s\n", file, strerror(errno));
                return;
        }
        if (fstat(fd, &stb) < 0) {
                error("%s: %s\n", file, strerror(errno));
                (void) close(fd);
                return;
        }
        if (stb.st_size == 0) {
                (void) close(fd);
                return;
        }
        /*
         * Create a pipe to mailling program.
         */
        (void)snprintf(buf, sizeof(buf), "%s -oi -t", _PATH_SENDMAIL);
        pf = popen(buf, "w");
        if (pf == NULL) {
                error("notify: \"%s\" failed\n", _PATH_SENDMAIL);
                (void) close(fd);
                return;
        }
        /*
         * Output the proper header information.
         */
        fprintf(pf, "From: rdist (Remote distribution program)\n");
        fprintf(pf, "To:");
        if (!any('@', to->n_name) && rhost != NULL)
                fprintf(pf, " %s@%s", to->n_name, nrhost);
        else
                fprintf(pf, " %s", to->n_name);
        to = to->n_next;
        while (to != NULL) {
                if (!any('@', to->n_name) && rhost != NULL)
                        fprintf(pf, ", %s@%s", to->n_name, nrhost);
                else
                        fprintf(pf, ", %s", to->n_name);
                to = to->n_next;
        }
        putc('\n', pf);
        if (rhost != NULL)
                fprintf(pf, "Subject: files updated by rdist from %s to %s\n",
                        host, rhost);
        else
                fprintf(pf, "Subject: files updated after %s\n", ctime(&lmod));
        putc('\n', pf);

        while ((len = read(fd, buf, BUFSIZ)) > 0)
                if (fwrite(buf, 1, len, pf) < 1)
                        error("%s: %s\n", file, strerror(errno));
        (void) close(fd);
        (void) pclose(pf);
}

/*
 * Return true if name is in the list.
 */
int
inlist(struct namelist *list, char *file)
{
        struct namelist *nl;

        for (nl = list; nl != NULL; nl = nl->n_next)
                if (!strcmp(file, nl->n_name))
                        return(1);
        return(0);
}

/*
 * Return TRUE if file is in the exception list.
 */
int
except(char *file)
{
        struct  subcmd *sc;
        struct  namelist *nl;
        int err;
        regex_t s;

        if (debug)
                printf("except(%s)\n", file);

        for (sc = subcmds; sc != NULL; sc = sc->sc_next) {
                if (sc->sc_type != EXCEPT && sc->sc_type != PATTERN)
                        continue;
                for (nl = sc->sc_args; nl != NULL; nl = nl->n_next) {
                        if (sc->sc_type == EXCEPT) {
                                if (!strcmp(file, nl->n_name))
                                        return(1);
                                continue;
                        }
                        if ((err = regcomp(&s, nl->n_name, 0)) != 0) {
                                char ebuf[BUFSIZ];
                                (void) regerror(err, &s, ebuf, sizeof(ebuf));
                                error("%s: %s\n", nl->n_name, ebuf);
                        }
                        if (regexec(&s, file, 0, NULL, 0) == 0) {
                                regfree(&s);
                                return(1);
                        }
                        regfree(&s);
                }
        }
        return(0);
}

char *
colon(char *cp)
{

        while (*cp) {
                if (*cp == ':')
                        return(cp);
                if (*cp == '/')
                        return(0);
                cp++;
        }
        return(0);
}