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
40 RCSID("$Id: popen.c,v 1.26 2002/04/02 11:57:39 joda Exp $");
43 #include <sys/types.h>
44 #ifdef TIME_WITH_SYS_TIME
47 #elif defined(HAVE_SYS_TIME_H)
52 #ifdef HAVE_SYS_RESOURCE_H
53 #include <sys/resource.h>
69 * Special version of popen which avoids call to shell. This ensures
70 * no one may create a pipe to a hidden program as a side effect of a
71 * list or dir command.
78 /* return path prepended with ~ftp if that file exists, otherwise
79 * return path unchanged
83 ftp_rooted(const char *path)
85 static char home[MaxPathLen] = "";
86 static char newpath[MaxPathLen];
90 if((pwd = k_getpwnam("ftp")))
91 strlcpy(home, pwd->pw_dir, sizeof(home));
92 snprintf(newpath, sizeof(newpath), "%s/%s", home, path);
93 if(access(newpath, X_OK))
94 strlcpy(newpath, path, sizeof(newpath));
100 #define MAXGLOBS 1000
103 ftpd_popen(char *program, char *type, int do_stderr, int no_glob)
107 int argc, gargc, pdes[2], pid;
108 char **pop, *argv[MAXARGS], *gargv[MAXGLOBS];
111 if (strcmp(type, "r") && strcmp(type, "w"))
116 /* This function is ugly and should be rewritten, in
117 * modern unices there is no such thing as a maximum
121 fds = getdtablesize();
122 pids = (int*)calloc(fds, sizeof(int));
129 /* break up string into pieces */
131 for (argc = 0, cp = program; argc < MAXARGS - 1; cp = NULL) {
132 if (!(argv[argc++] = strtok_r(cp, " \t\n", &foo)))
135 argv[MAXARGS - 1] = NULL;
137 gargv[0] = (char*)ftp_rooted(argv[0]);
138 /* glob each piece */
139 for (gargc = argc = 1; argv[argc] && gargc < MAXGLOBS - 1; argc++) {
141 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE
150 memset(&gl, 0, sizeof(gl));
152 glob(argv[argc], flags, NULL, &gl) ||
154 gargv[gargc++] = strdup(argv[argc]);
156 for (pop = gl.gl_pathv;
157 *pop && gargc < MAXGLOBS - 1;
159 gargv[gargc++] = strdup(*pop);
165 switch(pid = fork()) {
173 if (pdes[1] != STDOUT_FILENO) {
174 dup2(pdes[1], STDOUT_FILENO);
178 dup2(STDOUT_FILENO, STDERR_FILENO);
181 if (pdes[0] != STDIN_FILENO) {
182 dup2(pdes[0], STDIN_FILENO);
187 execv(gargv[0], gargv);
189 execv(gargv[0], gargv);
192 /* parent; assume fdopen can't fail... */
194 iop = fdopen(pdes[0], type);
197 iop = fdopen(pdes[1], type);
200 pids[fileno(iop)] = pid;
203 for (argc = 1; gargv[argc] != NULL; argc++)
211 ftpd_pclose(FILE *iop)
215 sigset_t sigset, osigset;
218 * pclose returns -1 if stream is not associated with a
219 * `popened' command, or, if already `pclosed'.
221 if (pids == 0 || pids[fdes = fileno(iop)] == 0)
224 sigemptyset(&sigset);
225 sigaddset(&sigset, SIGINT);
226 sigaddset(&sigset, SIGQUIT);
227 sigaddset(&sigset, SIGHUP);
228 sigprocmask(SIG_BLOCK, &sigset, &osigset);
229 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR)
231 sigprocmask(SIG_SETMASK, &osigset, NULL);
235 if (WIFEXITED(status))
236 return (WEXITSTATUS(status));