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-rw-r--r--crypto/heimdal/appl/rcp/rcp.c807
1 files changed, 807 insertions, 0 deletions
diff --git a/crypto/heimdal/appl/rcp/rcp.c b/crypto/heimdal/appl/rcp/rcp.c
new file mode 100644
index 0000000..1c532ad
--- /dev/null
+++ b/crypto/heimdal/appl/rcp/rcp.c
@@ -0,0 +1,807 @@
+/*
+ * 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"
+
+#define RSH_PROGRAM "rsh"
+#define OPTIONS "5dfKpP:rtxz"
+
+struct passwd *pwd;
+uid_t userid;
+int errs, remin, remout;
+int pflag, iamremote, iamrecursive, targetshouldbedirectory;
+int doencrypt, noencrypt;
+int usebroken, usekrb5;
+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 *[]);
+void usage (void);
+
+int do_cmd(char *host, char *remuser, char *cmd, int *fdin, int *fdout);
+
+int
+main(argc, argv)
+ int argc;
+ char *argv[];
+{
+ int ch, fflag, tflag;
+ char *targ;
+
+ fflag = tflag = 0;
+ while ((ch = getopt(argc, argv, OPTIONS)) != -1)
+ switch(ch) { /* User-visible flags. */
+ case '5':
+ usekrb5 = 1;
+ break;
+ case 'K':
+ usebroken = 1;
+ break;
+ case 'P':
+ port = optarg;
+ break;
+ case 'p':
+ pflag = 1;
+ break;
+ case 'r':
+ iamrecursive = 1;
+ break;
+ case 'x':
+ doencrypt = 1;
+ break;
+ case 'z':
+ noencrypt = 1;
+ break;
+ /* Server options. */
+ case 'd':
+ targetshouldbedirectory = 1;
+ break;
+ case 'f': /* "from" */
+ iamremote = 1;
+ fflag = 1;
+ break;
+ case 't': /* "to" */
+ iamremote = 1;
+ tflag = 1;
+ break;
+ case '?':
+ default:
+ usage();
+ }
+ 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();
+ (void)setuid(userid);
+ source(argc, argv);
+ exit(errs);
+ }
+
+ if (tflag) { /* Receive data. */
+ (void)setuid(userid);
+ sink(argc, argv);
+ exit(errs);
+ }
+
+ if (argc < 2)
+ usage();
+ if (argc > 2)
+ targetshouldbedirectory = 1;
+
+ remin = remout = -1;
+ /* Command to be executed on remote system using "rsh". */
+ (void) sprintf(cmd, "rcp%s%s%s", iamrecursive ? " -r" : "",
+ pflag ? " -p" : "", targetshouldbedirectory ? " -d" : "");
+
+ (void)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(targ, argc, argv)
+ char *targ, *argv[];
+ int argc;
+{
+ int i, len;
+ 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], '@');
+ len = strlen(_PATH_RSH) + strlen(argv[i]) +
+ strlen(src) + (tuser ? strlen(tuser) : 0) +
+ strlen(thost) + strlen(targ) + CMDNEEDS + 20;
+ if (!(bp = malloc(len)))
+ err(1, "malloc");
+ if (host) {
+ *host++ = 0;
+ suser = argv[i];
+ if (*suser == '\0')
+ suser = pwd->pw_name;
+ else if (!okname(suser))
+ continue;
+ (void)snprintf(bp, len,
+ "%s %s -l %s -n %s %s '%s%s%s:%s'",
+ _PATH_RSH, host, suser, cmd, src,
+ tuser ? tuser : "", tuser ? "@" : "",
+ thost, targ);
+ } else
+ (void)snprintf(bp, len,
+ "exec %s %s -n %s %s '%s%s%s:%s'",
+ _PATH_RSH, argv[i], cmd, src,
+ tuser ? tuser : "", tuser ? "@" : "",
+ thost, targ);
+ (void)susystem(bp, userid);
+ (void)free(bp);
+ } else { /* local to remote */
+ if (remin == -1) {
+ len = strlen(targ) + CMDNEEDS + 20;
+ if (!(bp = malloc(len)))
+ err(1, "malloc");
+ (void)snprintf(bp, len, "%s -t %s", cmd, targ);
+ host = thost;
+
+ if (do_cmd(host, tuser, bp, &remin, &remout) < 0)
+ exit(1);
+
+ if (response() < 0)
+ exit(1);
+ (void)free(bp);
+ (void)setuid(userid);
+ }
+ source(1, argv+i);
+ }
+ }
+}
+
+void
+tolocal(argc, argv)
+ int argc;
+ char *argv[];
+{
+ int i, len;
+ char *bp, *host, *src, *suser;
+
+ for (i = 0; i < argc - 1; i++) {
+ if (!(src = colon(argv[i]))) { /* Local to local. */
+ len = strlen(_PATH_CP) + strlen(argv[i]) +
+ strlen(argv[argc - 1]) + 20;
+ if (!(bp = malloc(len)))
+ err(1, "malloc");
+ (void)snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
+ iamrecursive ? " -PR" : "", pflag ? " -p" : "",
+ argv[i], argv[argc - 1]);
+ if (susystem(bp, userid))
+ ++errs;
+ (void)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;
+ }
+ len = strlen(src) + CMDNEEDS + 20;
+ if ((bp = malloc(len)) == NULL)
+ err(1, "malloc");
+ (void)snprintf(bp, len, "%s -f %s", cmd, src);
+ if (do_cmd(host, suser, bp, &remin, &remout) < 0) {
+ (void)free(bp);
+ ++errs;
+ continue;
+ }
+ (void)free(bp);
+ sink(1, argv + argc - 1);
+ (void)seteuid(0);
+ (void)close(remin);
+ remin = remout = -1;
+ }
+}
+
+void
+source(argc, argv)
+ 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.
+ */
+ (void)snprintf(buf, sizeof(buf), "T%ld 0 %ld 0\n",
+ (long)stb.st_mtime,
+ (long)stb.st_atime);
+ (void)write(remout, buf, strlen(buf));
+ if (response() < 0)
+ goto next;
+ }
+#define MODEMASK (S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO)
+ (void)snprintf(buf, sizeof(buf), "C%04o %lu %s\n",
+ stb.st_mode & MODEMASK, (unsigned long)stb.st_size, last);
+ (void)write(remout, buf, strlen(buf));
+ if (response() < 0)
+ goto next;
+ if ((bp = allocbuf(&buffer, fd, BUFSIZ)) == NULL) {
+next: (void)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)
+ (void)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)
+ (void)write(remout, "", 1);
+ else
+ run_err("%s: %s", name, strerror(haderr));
+ (void)response();
+ }
+}
+
+void
+rsource(name, statp)
+ 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) {
+ (void)snprintf(path, sizeof(path), "T%ld 0 %ld 0\n",
+ (long)statp->st_mtime,
+ (long)statp->st_atime);
+ (void)write(remout, path, strlen(path));
+ if (response() < 0) {
+ closedir(dirp);
+ return;
+ }
+ }
+ (void)snprintf(path, sizeof(path),
+ "D%04o %d %s\n", statp->st_mode & MODEMASK, 0, last);
+ (void)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;
+ }
+ (void)snprintf(path, sizeof(path), "%s/%s", name, dp->d_name);
+ vect[0] = path;
+ source(1, vect);
+ }
+ (void)closedir(dirp);
+ (void)write(remout, "E\n", 2);
+ (void)response();
+}
+
+void
+sink(argc, argv)
+ 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)
+ (void)umask(mask);
+ if (argc != 1) {
+ run_err("ambiguous target");
+ exit(1);
+ }
+ targ = *argv;
+ if (targetshouldbedirectory)
+ verifydir(targ);
+ (void)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)
+ (void)write(STDERR_FILENO,
+ buf + 1, strlen(buf + 1));
+ if (buf[0] == '\02')
+ exit(1);
+ ++errs;
+ continue;
+ }
+ if (buf[0] == 'E') {
+ (void)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");
+ (void)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(*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));
+ }
+ (void)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)
+ (void)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)
+ (void)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;
+ }
+ (void)write(remout, "", 1);
+ if ((bp = allocbuf(&buffer, ofd, BUFSIZ)) == NULL) {
+ (void)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;
+ do {
+ j = read(remin, cp, amt);
+ if (j <= 0) {
+ run_err("%s", j ? strerror(errno) :
+ "dropped connection");
+ exit(1);
+ }
+ amt -= j;
+ cp += j;
+ } while (amt > 0);
+ 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));
+ }
+ (void)close(ofd);
+ (void)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:
+ (void)write(remout, "", 1);
+ break;
+ case DISPLAYED:
+ break;
+ }
+ }
+screwup:
+ run_err("protocol error: %s", why);
+ exit(1);
+}
+
+int
+response()
+{
+ 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)
+ (void)write(STDERR_FILENO, rbuf, cp - rbuf);
+ ++errs;
+ if (resp == 1)
+ return (-1);
+ exit(1);
+ }
+ /* NOTREACHED */
+}
+
+void
+usage()
+{
+ (void)fprintf(stderr, "%s\n%s\n",
+ "usage: rcp [-5FKpx] [-P port] f1 f2",
+ " rcp [-5FKprx] [-P port] f1 ... fn directory");
+ exit(1);
+}
+
+#include <stdarg.h>
+
+void
+run_err(const char *fmt, ...)
+{
+ static FILE *fp;
+ va_list ap;
+ va_start(ap, fmt);
+
+ ++errs;
+ if (fp == NULL && !(fp = fdopen(remout, "w")))
+ return;
+ (void)fprintf(fp, "%c", 0x01);
+ (void)fprintf(fp, "rcp: ");
+ (void)vfprintf(fp, fmt, ap);
+ (void)fprintf(fp, "\n");
+ (void)fflush(fp);
+
+ if (!iamremote)
+ 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 (usekrb5)
+ args[i++] = "-5";
+ if (usebroken)
+ args[i++] = "-K";
+ if (doencrypt)
+ args[i++] = "-x";
+ 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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