+/*
+ * Copyright (c) 1983 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.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#) Copyright (c) 1983 The Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)rexecd.c 5.12 (Berkeley) 2/25/91";
+#endif /* not lint */
+
+#include <sys/param.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <netinet/in.h>
+#include <signal.h>
+#include <netdb.h>
+#include <pwd.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <paths.h>
+
+/*VARARGS1*/
+int error();
+
+/*
+ * remote execute server:
+ * username\0
+ * password\0
+ * command\0
+ * data
+ */
+/*ARGSUSED*/
+main(argc, argv)
+ int argc;
+ char **argv;
+{
+ struct sockaddr_in from;
+ int fromlen;
+
+ fromlen = sizeof (from);
+ if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) {
+ (void)fprintf(stderr,
+ "rexecd: getpeername: %s\n", strerror(errno));
+ exit(1);
+ }
+ doit(0, &from);
+}
+
+char username[20] = "USER=";
+char homedir[64] = "HOME=";
+char shell[64] = "SHELL=";
+char path[sizeof(_PATH_DEFPATH) + sizeof("PATH=")] = "PATH=";
+char *envinit[] =
+ {homedir, shell, path, username, 0};
+char **environ;
+
+struct sockaddr_in asin = { AF_INET };
+
+doit(f, fromp)
+ int f;
+ struct sockaddr_in *fromp;
+{
+ char cmdbuf[NCARGS+1], *cp, *namep;
+ char user[16], pass[16];
+ struct passwd *pwd;
+ int s;
+ u_short port;
+ int pv[2], pid, ready, readfrom, cc;
+ char buf[BUFSIZ], sig;
+ int one = 1;
+
+ (void) signal(SIGINT, SIG_DFL);
+ (void) signal(SIGQUIT, SIG_DFL);
+ (void) signal(SIGTERM, SIG_DFL);
+#ifdef DEBUG
+ { int t = open(_PATH_TTY, 2);
+ if (t >= 0) {
+ ioctl(t, TIOCNOTTY, (char *)0);
+ (void) close(t);
+ }
+ }
+#endif
+ dup2(f, 0);
+ dup2(f, 1);
+ dup2(f, 2);
+ (void) alarm(60);
+ port = 0;
+ for (;;) {
+ char c;
+ if (read(f, &c, 1) != 1)
+ exit(1);
+ if (c == 0)
+ break;
+ port = port * 10 + c - '0';
+ }
+ (void) alarm(0);
+ if (port != 0) {
+ s = socket(AF_INET, SOCK_STREAM, 0);
+ if (s < 0)
+ exit(1);
+ if (bind(s, (struct sockaddr *)&asin, sizeof (asin)) < 0)
+ exit(1);
+ (void) alarm(60);
+ fromp->sin_port = htons(port);
+ if (connect(s, (struct sockaddr *)fromp, sizeof (*fromp)) < 0)
+ exit(1);
+ (void) alarm(0);
+ }
+ getstr(user, sizeof(user), "username");
+ getstr(pass, sizeof(pass), "password");
+ getstr(cmdbuf, sizeof(cmdbuf), "command");
+ setpwent();
+ pwd = getpwnam(user);
+ if (pwd == NULL) {
+ error("Login incorrect.\n");
+ exit(1);
+ }
+ endpwent();
+ if (*pwd->pw_passwd != '\0') {
+ namep = crypt(pass, pwd->pw_passwd);
+ if (strcmp(namep, pwd->pw_passwd)) {
+ error("Password incorrect.\n");
+ exit(1);
+ }
+ }
+ if (chdir(pwd->pw_dir) < 0) {
+ error("No remote directory.\n");
+ exit(1);
+ }
+ (void) write(2, "\0", 1);
+ if (port) {
+ (void) pipe(pv);
+ pid = fork();
+ if (pid == -1) {
+ error("Try again.\n");
+ exit(1);
+ }
+ if (pid) {
+ (void) close(0); (void) close(1); (void) close(2);
+ (void) close(f); (void) close(pv[1]);
+ readfrom = (1<<s) | (1<<pv[0]);
+ ioctl(pv[1], FIONBIO, (char *)&one);
+ /* should set s nbio! */
+ do {
+ ready = readfrom;
+ (void) select(16, (fd_set *)&ready,
+ (fd_set *)NULL, (fd_set *)NULL,
+ (struct timeval *)NULL);
+ if (ready & (1<<s)) {
+ if (read(s, &sig, 1) <= 0)
+ readfrom &= ~(1<<s);
+ else
+ killpg(pid, sig);
+ }
+ if (ready & (1<<pv[0])) {
+ cc = read(pv[0], buf, sizeof (buf));
+ if (cc <= 0) {
+ shutdown(s, 1+1);
+ readfrom &= ~(1<<pv[0]);
+ } else
+ (void) write(s, buf, cc);
+ }
+ } while (readfrom);
+ exit(0);
+ }
+ setpgrp(0, getpid());
+ (void) close(s); (void)close(pv[0]);
+ dup2(pv[1], 2);
+ }
+ if (*pwd->pw_shell == '\0')
+ pwd->pw_shell = _PATH_BSHELL;
+ if (f > 2)
+ (void) close(f);
+ (void) setgid((gid_t)pwd->pw_gid);
+ initgroups(pwd->pw_name, pwd->pw_gid);
+ (void) setuid((uid_t)pwd->pw_uid);
+ (void)strcat(path, _PATH_DEFPATH);
+ environ = envinit;
+ strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
+ strncat(shell, pwd->pw_shell, sizeof(shell)-7);
+ strncat(username, pwd->pw_name, sizeof(username)-6);
+ cp = rindex(pwd->pw_shell, '/');
+ if (cp)
+ cp++;
+ else
+ cp = pwd->pw_shell;
+ execl(pwd->pw_shell, cp, "-c", cmdbuf, 0);
+ perror(pwd->pw_shell);
+ exit(1);
+}
+
+/*VARARGS1*/
+error(fmt, a1, a2, a3)
+ char *fmt;
+ int a1, a2, a3;
+{
+ char buf[BUFSIZ];
+
+ buf[0] = 1;
+ (void) sprintf(buf+1, fmt, a1, a2, a3);
+ (void) write(2, buf, strlen(buf));
+}
+
+getstr(buf, cnt, err)
+ char *buf;
+ int cnt;
+ char *err;
+{
+ char c;
+
+ do {
+ if (read(0, &c, 1) != 1)
+ exit(1);
+ *buf++ = c;
+ if (--cnt == 0) {
+ error("%s too long\n", err);
+ exit(1);
+ }
+ } while (c != 0);
+}
projects / unix-history / commitdiff