2 * Copyright (c) 1988, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software written by Ken Arnold and
6 * published in UNIX Review, Vol. 6, No. 8.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 4/6/94";
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include <sys/types.h>
44 #include <netinet/in.h>
55 #include "pathnames.h"
59 #define MAXUSRARGS 100
60 #define MAXGLOBARGS 1000
63 * Special version of popen which avoids call to shell. This ensures noone
64 * may create a pipe to a hidden program as a side effect of a list or dir
71 ftpd_popen(char *program, char *type)
75 int argc, gargc, pdes[2], pid;
76 char **pop, *argv[MAXUSRARGS], *gargv[MAXGLOBARGS];
78 if (((*type != 'r') && (*type != 'w')) || type[1])
82 if ((fds = getdtablesize()) <= 0)
84 if ((pids = malloc(fds * sizeof(int))) == NULL)
86 memset(pids, 0, fds * sizeof(int));
91 /* break up string into pieces */
92 for (argc = 0, cp = program; argc < MAXUSRARGS; cp = NULL) {
93 if (!(argv[argc++] = strtok(cp, " \t\n")))
96 argv[argc - 1] = NULL;
100 for (gargc = argc = 1; argv[argc] && gargc < (MAXGLOBARGS-1); argc++) {
102 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE;
104 memset(&gl, 0, sizeof(gl));
105 gl.gl_matchc = MAXGLOBARGS;
107 if (glob(argv[argc], flags, NULL, &gl))
108 gargv[gargc++] = strdup(argv[argc]);
109 else if (gl.gl_pathc > 0) {
110 for (pop = gl.gl_pathv; *pop && gargc < (MAXGLOBARGS-1);
112 gargv[gargc++] = strdup(*pop);
120 pid = (strcmp(gargv[0], _PATH_LS) == 0) ? fork() : vfork();
123 (void)close(pdes[0]);
124 (void)close(pdes[1]);
129 if (pdes[1] != STDOUT_FILENO) {
130 dup2(pdes[1], STDOUT_FILENO);
131 (void)close(pdes[1]);
133 dup2(STDOUT_FILENO, STDERR_FILENO); /* stderr too! */
134 (void)close(pdes[0]);
136 if (pdes[0] != STDIN_FILENO) {
137 dup2(pdes[0], STDIN_FILENO);
138 (void)close(pdes[0]);
140 (void)close(pdes[1]);
142 /* Drop privileges before proceeding */
143 if (getuid() != geteuid() && setuid(geteuid()) < 0)
145 if (strcmp(gargv[0], _PATH_LS) == 0) {
146 /* Reset getopt for ls_main() */
147 optreset = optind = optopt = 1;
148 /* Close syslogging to remove pwd.db missing msgs */
150 /* Trigger to sense new /etc/localtime after chroot */
151 if (getenv("TZ") == NULL) {
157 exit(ls_main(gargc, gargv));
159 execv(gargv[0], gargv);
162 /* parent; assume fdopen can't fail... */
164 iop = fdopen(pdes[0], type);
165 (void)close(pdes[1]);
167 iop = fdopen(pdes[1], type);
168 (void)close(pdes[0]);
170 pids[fileno(iop)] = pid;
172 pfree: for (argc = 1; gargv[argc] != NULL; argc++)
179 ftpd_pclose(FILE *iop)
181 int fdes, omask, status;
185 * pclose returns -1 if stream is not associated with a
186 * `popened' command, or, if already `pclosed'.
188 if (pids == 0 || pids[fdes = fileno(iop)] == 0)
191 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
192 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR)
194 (void)sigsetmask(omask);
198 if (WIFEXITED(status))
199 return (WEXITSTATUS(status));