Merge from vendor branch GROFF:
[dragonfly.git] / libexec / ftpd / popen.c
CommitLineData
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1/*
2 * Copyright (c) 1988, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software written by Ken Arnold and
6 * published in UNIX Review, Vol. 6, No. 8.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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.
23 *
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
34 * SUCH DAMAGE.
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35 *
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 1.2 2003/06/17 04:27:07 dillon Exp $
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39 */
40
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41#include <sys/types.h>
42#include <sys/wait.h>
43#include <netinet/in.h>
44
45#include <errno.h>
46#include <glob.h>
47#include <signal.h>
48#include <stdio.h>
49#include <stdlib.h>
50#include <string.h>
51#include <unistd.h>
52
53#include "extern.h"
54#include "pathnames.h"
55#include <syslog.h>
56#include <time.h>
57#include <varargs.h>
58
59#define MAXUSRARGS 100
60#define MAXGLOBARGS 1000
61
62/*
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
65 * command.
66 */
67static int *pids;
68static int fds;
69
70FILE *
71ftpd_popen(program, type)
72 char *program, *type;
73{
74 char *cp;
75 FILE *iop;
76 int argc, gargc, pdes[2], pid;
77 char **pop, *argv[MAXUSRARGS], *gargv[MAXGLOBARGS];
78
79 if (((*type != 'r') && (*type != 'w')) || type[1])
80 return (NULL);
81
82 if (!pids) {
83 if ((fds = getdtablesize()) <= 0)
84 return (NULL);
85 if ((pids = (int *)malloc((u_int)(fds * sizeof(int)))) == NULL)
86 return (NULL);
87 memset(pids, 0, fds * sizeof(int));
88 }
89 if (pipe(pdes) < 0)
90 return (NULL);
91
92 /* break up string into pieces */
93 for (argc = 0, cp = program; argc < MAXUSRARGS; cp = NULL) {
94 if (!(argv[argc++] = strtok(cp, " \t\n")))
95 break;
96 }
97 argv[argc - 1] = NULL;
98
99 /* glob each piece */
100 gargv[0] = argv[0];
101 for (gargc = argc = 1; argv[argc] && gargc < (MAXGLOBARGS-1); argc++) {
102 glob_t gl;
103 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE;
104
105 memset(&gl, 0, sizeof(gl));
106 gl.gl_matchc = MAXGLOBARGS;
107 flags |= GLOB_LIMIT;
108 if (glob(argv[argc], flags, NULL, &gl))
109 gargv[gargc++] = strdup(argv[argc]);
110 else
111 for (pop = gl.gl_pathv; *pop && gargc < (MAXGLOBARGS-1);
112 pop++)
113 gargv[gargc++] = strdup(*pop);
114 globfree(&gl);
115 }
116 gargv[gargc] = NULL;
117
118 iop = NULL;
119 fflush(NULL);
120 pid = (strcmp(gargv[0], _PATH_LS) == 0) ? fork() : vfork();
121 switch(pid) {
122 case -1: /* error */
123 (void)close(pdes[0]);
124 (void)close(pdes[1]);
125 goto pfree;
126 /* NOTREACHED */
127 case 0: /* child */
128 if (*type == 'r') {
129 if (pdes[1] != STDOUT_FILENO) {
130 dup2(pdes[1], STDOUT_FILENO);
131 (void)close(pdes[1]);
132 }
133 dup2(STDOUT_FILENO, STDERR_FILENO); /* stderr too! */
134 (void)close(pdes[0]);
135 } else {
136 if (pdes[0] != STDIN_FILENO) {
137 dup2(pdes[0], STDIN_FILENO);
138 (void)close(pdes[0]);
139 }
140 (void)close(pdes[1]);
141 }
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 */
146 closelog();
147 /* Trigger to sense new /etc/localtime after chroot */
148 if (getenv("TZ") == NULL) {
149 setenv("TZ", "", 0);
150 tzset();
151 unsetenv("TZ");
152 tzset();
153 }
154 exit(ls_main(gargc, gargv));
155 }
156 execv(gargv[0], gargv);
157 _exit(1);
158 }
159 /* parent; assume fdopen can't fail... */
160 if (*type == 'r') {
161 iop = fdopen(pdes[0], type);
162 (void)close(pdes[1]);
163 } else {
164 iop = fdopen(pdes[1], type);
165 (void)close(pdes[0]);
166 }
167 pids[fileno(iop)] = pid;
168
169pfree: for (argc = 1; gargv[argc] != NULL; argc++)
170 free(gargv[argc]);
171
172 return (iop);
173}
174
175int
176ftpd_pclose(iop)
177 FILE *iop;
178{
179 int fdes, omask, status;
180 pid_t pid;
181
182 /*
183 * pclose returns -1 if stream is not associated with a
184 * `popened' command, or, if already `pclosed'.
185 */
186 if (pids == 0 || pids[fdes = fileno(iop)] == 0)
187 return (-1);
188 (void)fclose(iop);
189 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
190 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR)
191 continue;
192 (void)sigsetmask(omask);
193 pids[fdes] = 0;
194 if (pid < 0)
195 return (pid);
196 if (WIFEXITED(status))
197 return (WEXITSTATUS(status));
198 return (1);
199}