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rcp.c

/*
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. 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;

#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, '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. */
            response();
            setuid(userid);
            source(argc, argv);
            exit(errs);
      }

      if (tflag) {                  /* Receive data. */
            setuid(userid);
            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], '@'))) {
            /* 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;
      }

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

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

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

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

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

void
source(int argc, char **argv)
{
      struct stat stb;
      static BUF buffer;
      BUF *bp;
      off_t i;
      int amt, 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;
            }
            switch (stb.st_mode & S_IFMT) {
            case S_IFREG:
                  break;
            case S_IFDIR:
                  if (iamrecursive) {
                        rsource(name, &stb);
                        goto next;
                  }
                  /* FALLTHROUGH */
            default:
                  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;
            }
#define     MODEMASK    (S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO)
            snprintf(buf, sizeof(buf), "C%04o %lu %s\n",
                   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, amt);
                        if (result != amt)
                              haderr = result >= 0 ? EIO : errno;
                  }
                  if (haderr)
                        write(remout, bp->buf, amt);
                  else {
                        result = write(remout, bp->buf, 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", statp->st_mode & MODEMASK, 0, last);
      write(remout, path, strlen(path));
      if (response() < 0) {
            closedir(dirp);
            return;
      }
      while ((dp = readdir(dirp))) {
            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, 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, 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 (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;
}

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