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 1.19 1999/09/16 20:38:45 assar 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>
70 * Special version of popen which avoids call to shell. This ensures
71 * no one may create a pipe to a hidden program as a side effect of a
72 * list or dir command.
79 /* return path prepended with ~ftp if that file exists, otherwise
80 * return path unchanged
84 ftp_rooted(const char *path)
86 static char home[MaxPathLen] = "";
87 static char newpath[MaxPathLen];
91 if((pwd = k_getpwnam("ftp")))
92 strlcpy(home, pwd->pw_dir, sizeof(home));
93 snprintf(newpath, sizeof(newpath), "%s/%s", home, path);
94 if(access(newpath, X_OK))
95 strlcpy(newpath, path, sizeof(newpath));
101 ftpd_popen(char *program, char *type, int do_stderr, int no_glob)
105 int argc, gargc, pdes[2], pid;
106 char **pop, *argv[100], *gargv[1000];
109 if (strcmp(type, "r") && strcmp(type, "w"))
114 /* This function is ugly and should be rewritten, in
115 * modern unices there is no such thing as a maximum
119 fds = getdtablesize();
120 pids = (int*)calloc(fds, sizeof(int));
127 /* break up string into pieces */
129 for (argc = 0, cp = program;; cp = NULL) {
130 if (!(argv[argc++] = strtok_r(cp, " \t\n", &foo)))
134 gargv[0] = (char*)ftp_rooted(argv[0]);
135 /* glob each piece */
136 for (gargc = argc = 1; argv[argc]; argc++) {
138 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE;
140 memset(&gl, 0, sizeof(gl));
141 if (no_glob || glob(argv[argc], flags, NULL, &gl))
142 gargv[gargc++] = strdup(argv[argc]);
144 for (pop = gl.gl_pathv; *pop; pop++)
145 gargv[gargc++] = strdup(*pop);
151 switch(pid = fork()) {
159 if (pdes[1] != STDOUT_FILENO) {
160 dup2(pdes[1], STDOUT_FILENO);
164 dup2(STDOUT_FILENO, STDERR_FILENO);
167 if (pdes[0] != STDIN_FILENO) {
168 dup2(pdes[0], STDIN_FILENO);
173 execv(gargv[0], gargv);
175 execv(gargv[0], gargv);
178 /* parent; assume fdopen can't fail... */
180 iop = fdopen(pdes[0], type);
183 iop = fdopen(pdes[1], type);
186 pids[fileno(iop)] = pid;
189 for (argc = 1; gargv[argc] != NULL; argc++)
197 ftpd_pclose(FILE *iop)
201 sigset_t sigset, osigset;
204 * pclose returns -1 if stream is not associated with a
205 * `popened' command, or, if already `pclosed'.
207 if (pids == 0 || pids[fdes = fileno(iop)] == 0)
210 sigemptyset(&sigset);
211 sigaddset(&sigset, SIGINT);
212 sigaddset(&sigset, SIGQUIT);
213 sigaddset(&sigset, SIGHUP);
214 sigprocmask(SIG_BLOCK, &sigset, &osigset);
215 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR)
217 sigprocmask(SIG_SETMASK, &osigset, NULL);
221 if (WIFEXITED(status))
222 return (WEXITSTATUS(status));