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. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)popen.c 8.3 (Berkeley) 4/6/94
37 * $FreeBSD: src/libexec/ftpd/popen.c,v 1.18.2.3 2001/08/09 00:53:18 mikeh Exp $
38 * $DragonFly: src/libexec/ftpd/popen.c,v 1.3 2006/01/12 13:43:10 corecode Exp $
41 #include <sys/types.h>
43 #include <netinet/in.h>
54 #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(program, type)
76 int argc, gargc, pdes[2], pid;
77 char **pop, *argv[MAXUSRARGS], *gargv[MAXGLOBARGS];
79 if (((*type != 'r') && (*type != 'w')) || type[1])
83 if ((fds = getdtablesize()) <= 0)
85 if ((pids = (int *)malloc((u_int)(fds * sizeof(int)))) == NULL)
87 memset(pids, 0, fds * sizeof(int));
92 /* break up string into pieces */
93 for (argc = 0, cp = program; argc < MAXUSRARGS; cp = NULL) {
94 if (!(argv[argc++] = strtok(cp, " \t\n")))
97 argv[argc - 1] = NULL;
101 for (gargc = argc = 1; argv[argc] && gargc < (MAXGLOBARGS-1); argc++) {
103 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE;
105 memset(&gl, 0, sizeof(gl));
106 gl.gl_matchc = MAXGLOBARGS;
108 if (glob(argv[argc], flags, NULL, &gl))
109 gargv[gargc++] = strdup(argv[argc]);
111 for (pop = gl.gl_pathv; *pop && gargc < (MAXGLOBARGS-1);
113 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 if (strcmp(gargv[0], _PATH_LS) == 0) {
143 /* Reset getopt for ls_main() */
144 optreset = optind = optopt = 1;
145 /* Close syslogging to remove pwd.db missing msgs */
147 /* Trigger to sense new /etc/localtime after chroot */
148 if (getenv("TZ") == NULL) {
149 if (setenv("TZ", "", 0) == -1)
150 syslog(LOG_ERR, "setenv: cannot set TZ: %m");
155 exit(ls_main(gargc, gargv));
157 execv(gargv[0], gargv);
160 /* parent; assume fdopen can't fail... */
162 iop = fdopen(pdes[0], type);
163 (void)close(pdes[1]);
165 iop = fdopen(pdes[1], type);
166 (void)close(pdes[0]);
168 pids[fileno(iop)] = pid;
170 pfree: for (argc = 1; gargv[argc] != NULL; argc++)
180 int fdes, omask, status;
184 * pclose returns -1 if stream is not associated with a
185 * `popened' command, or, if already `pclosed'.
187 if (pids == 0 || pids[fdes = fileno(iop)] == 0)
190 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
191 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR)
193 (void)sigsetmask(omask);
197 if (WIFEXITED(status))
198 return (WEXITSTATUS(status));