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
32 * @(#)popen.c 8.3 (Berkeley) 4/6/94
33 * $FreeBSD: src/libexec/ftpd/popen.c,v 1.26 2004/11/18 13:46:29 yar Exp $
36 #include <sys/types.h>
38 #include <netinet/in.h>
49 #include "pathnames.h"
53 #define MAXUSRARGS 100
54 #define MAXGLOBARGS 1000
57 * Special version of popen which avoids call to shell. This ensures noone
58 * may create a pipe to a hidden program as a side effect of a list or dir
65 ftpd_popen(char *program, char *type)
69 int argc, gargc, pdes[2], pid;
70 char **pop, *argv[MAXUSRARGS], *gargv[MAXGLOBARGS];
72 if (((*type != 'r') && (*type != 'w')) || type[1])
76 if ((fds = getdtablesize()) <= 0)
78 if ((pids = malloc(fds * sizeof(int))) == NULL)
80 memset(pids, 0, fds * sizeof(int));
85 /* break up string into pieces */
86 for (argc = 0, cp = program; argc < MAXUSRARGS; cp = NULL) {
87 if (!(argv[argc++] = strtok(cp, " \t\n")))
90 argv[argc - 1] = NULL;
94 for (gargc = argc = 1; argv[argc] && gargc < (MAXGLOBARGS-1); argc++) {
96 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE;
98 memset(&gl, 0, sizeof(gl));
99 gl.gl_matchc = MAXGLOBARGS;
100 /*flags |= GLOB_LIMIT;*/
101 if (glob(argv[argc], flags, NULL, &gl))
102 gargv[gargc++] = strdup(argv[argc]);
104 for (pop = gl.gl_pathv; *pop && gargc < (MAXGLOBARGS-1);
106 gargv[gargc++] = strdup(*pop);
113 pid = (strcmp(gargv[0], _PATH_LS) == 0) ? fork() : vfork();
122 if (pdes[1] != STDOUT_FILENO) {
123 dup2(pdes[1], STDOUT_FILENO);
126 dup2(STDOUT_FILENO, STDERR_FILENO); /* stderr too! */
129 if (pdes[0] != STDIN_FILENO) {
130 dup2(pdes[0], STDIN_FILENO);
135 if (strcmp(gargv[0], _PATH_LS) == 0) {
136 /* Reset getopt for ls_main() */
137 optreset = optind = optopt = 1;
138 /* Close syslogging to remove pwd.db missing msgs */
140 /* Trigger to sense new /etc/localtime after chroot */
141 if (getenv("TZ") == NULL) {
142 if (setenv("TZ", "", 0) == -1)
143 syslog(LOG_ERR, "setenv: cannot set TZ: %m");
148 exit(ls_main(gargc, gargv));
150 execv(gargv[0], gargv);
153 /* parent; assume fdopen can't fail... */
155 iop = fdopen(pdes[0], type);
158 iop = fdopen(pdes[1], type);
161 pids[fileno(iop)] = pid;
163 pfree: for (argc = 1; gargv[argc] != NULL; argc++)
170 ftpd_pclose(FILE *iop)
172 int fdes, omask, status;
176 * pclose returns -1 if stream is not associated with a
177 * `popened' command, or, if already `pclosed'.
179 if (pids == NULL || pids[fdes = fileno(iop)] == 0)
182 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
183 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR)
189 if (WIFEXITED(status))
190 return (WEXITSTATUS(status));