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 1.26 2004/11/18 13:46:29 yar 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"
58 #define MAXUSRARGS 100
59 #define MAXGLOBARGS 1000
62 * Special version of popen which avoids call to shell. This ensures noone
63 * may create a pipe to a hidden program as a side effect of a list or dir
70 ftpd_popen(char *program
, char *type
)
74 int argc
, gargc
, pdes
[2], pid
;
75 char **pop
, *argv
[MAXUSRARGS
], *gargv
[MAXGLOBARGS
];
77 if (((*type
!= 'r') && (*type
!= 'w')) || type
[1])
81 if ((fds
= getdtablesize()) <= 0)
83 if ((pids
= malloc(fds
* sizeof(int))) == NULL
)
85 memset(pids
, 0, fds
* sizeof(int));
90 /* break up string into pieces */
91 for (argc
= 0, cp
= program
; argc
< MAXUSRARGS
; cp
= NULL
) {
92 if (!(argv
[argc
++] = strtok(cp
, " \t\n")))
95 argv
[argc
- 1] = NULL
;
99 for (gargc
= argc
= 1; argv
[argc
] && gargc
< (MAXGLOBARGS
-1); argc
++) {
101 int flags
= GLOB_BRACE
|GLOB_NOCHECK
|GLOB_TILDE
;
103 memset(&gl
, 0, sizeof(gl
));
104 gl
.gl_matchc
= MAXGLOBARGS
;
106 if (glob(argv
[argc
], flags
, NULL
, &gl
))
107 gargv
[gargc
++] = strdup(argv
[argc
]);
109 for (pop
= gl
.gl_pathv
; *pop
&& gargc
< (MAXGLOBARGS
-1);
111 gargv
[gargc
++] = strdup(*pop
);
118 pid
= (strcmp(gargv
[0], _PATH_LS
) == 0) ? fork() : vfork();
127 if (pdes
[1] != STDOUT_FILENO
) {
128 dup2(pdes
[1], STDOUT_FILENO
);
131 dup2(STDOUT_FILENO
, STDERR_FILENO
); /* stderr too! */
134 if (pdes
[0] != STDIN_FILENO
) {
135 dup2(pdes
[0], STDIN_FILENO
);
140 if (strcmp(gargv
[0], _PATH_LS
) == 0) {
141 /* Reset getopt for ls_main() */
142 optreset
= optind
= optopt
= 1;
143 /* Close syslogging to remove pwd.db missing msgs */
145 /* Trigger to sense new /etc/localtime after chroot */
146 if (getenv("TZ") == NULL
) {
147 if (setenv("TZ", "", 0) == -1)
148 syslog(LOG_ERR
, "setenv: cannot set TZ: %m");
153 exit(ls_main(gargc
, gargv
));
155 execv(gargv
[0], gargv
);
158 /* parent; assume fdopen can't fail... */
160 iop
= fdopen(pdes
[0], type
);
163 iop
= fdopen(pdes
[1], type
);
166 pids
[fileno(iop
)] = pid
;
168 pfree
: for (argc
= 1; gargv
[argc
] != NULL
; argc
++)
175 ftpd_pclose(FILE *iop
)
177 int fdes
, omask
, status
;
181 * pclose returns -1 if stream is not associated with a
182 * `popened' command, or, if already `pclosed'.
184 if (pids
== 0 || pids
[fdes
= fileno(iop
)] == 0)
187 omask
= sigblock(sigmask(SIGINT
)|sigmask(SIGQUIT
)|sigmask(SIGHUP
));
188 while ((pid
= waitpid(pids
[fdes
], &status
, 0)) < 0 && errno
== EINTR
)
194 if (WIFEXITED(status
))
195 return (WEXITSTATUS(status
));