211 lines
6.3 KiB
C
211 lines
6.3 KiB
C
/* popen.c: A "safe" pipe open routine.
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%%% portions-copyright-cmetz-96
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Portions of this software are Copyright 1996-1998 by Craig Metz, All Rights
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Reserved. The Inner Net License Version 2 applies to these portions of
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the software.
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You should have received a copy of the license with this software. If
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you didn't get a copy, you may request one from <license@inner.net>.
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Portions of this software are Copyright 1995 by Randall Atkinson and Dan
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McDonald, All Rights Reserved. All Rights under this copyright are assigned
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to the U.S. Naval Research Laboratory (NRL). The NRL Copyright Notice and
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License Agreement applies to this software.
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History:
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Modified by cmetz for OPIE 2.31. Merged in some 4.4BSD-Lite fixes.
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Modified by cmetz for OPIE 2.2. Use FUNCTION declaration et al.
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Removed useless string. ifdef around some headers.
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Modified at NRL for OPIE 2.1. Optimized for only one pipe at a time.
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Added minimal version of sigprocmask(). Moved some pid_t
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dancing to the config headers.
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Modified at NRL for OPIE 2.0.
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Originally from BSD.
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*/
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/*
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* Copyright (c) 1988, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software written by Ken Arnold and
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* published in UNIX Review, Vol. 6, No. 8.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include "opie_cfg.h"
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#include <sys/types.h>
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#include <sys/wait.h>
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#if HAVE_SIGNAL_H
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#include <signal.h>
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#endif /* HAVE_SIGNAL_H */
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#if HAVE_SYS_SIGNAL_H
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#include <sys/signal.h>
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#endif /* HAVE_SYS_SIGNAL_H */
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include <stdio.h>
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#if HAVE_STDLIB_H
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#include <stdlib.h>
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#endif /* HAVE_STDLIB_H */
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#if HAVE_STRING_H
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#include <string.h>
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#endif /* HAVE_STRING_H */
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#include "opie.h"
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char **ftpglob __P((register char *));
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char **copyblk __P((char **));
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VOIDRET blkfree __P((char **));
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/*
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* Special version of popen which avoids call to shell. This ensures noone
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* may create a pipe to a hidden program as a side effect of a list or dir
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* command.
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*/
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static pid_t child_pid = -1;
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static int pipe_fd;
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extern char **environ;
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FILE *ftpd_popen FUNCTION((program, type), char *program AND char *type)
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{
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char *cp;
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FILE *iop;
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int argc, gargc, pdes[2];
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char **pop, *argv[100], *gargv[1000], *vv[2];
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if ((*type != 'r' && *type != 'w') || type[1])
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return (NULL);
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if (pipe(pdes) < 0)
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return (NULL);
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/* break up string into pieces */
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for (argc = 0, cp = program;; cp = NULL)
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if (!(argv[argc++] = strtok(cp, " \t\n")))
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break;
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/* glob each piece */
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gargv[0] = argv[0];
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for (gargc = argc = 1; argv[argc]; argc++) {
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if (!(pop = (char **) ftpglob(argv[argc]))) {
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/* globbing failed */
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vv[0] = argv[argc];
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vv[1] = NULL;
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pop = (char **) copyblk(vv);
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}
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argv[argc] = (char *) pop; /* save to free later */
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while (*pop && gargc < 1000)
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gargv[gargc++] = *pop++;
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}
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gargv[gargc] = NULL;
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iop = NULL;
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switch (child_pid = fork()) {
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case -1: /* error */
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close(pdes[0]);
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close(pdes[1]);
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goto pfree;
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/* NOTREACHED */
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case 0: /* child */
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if (*type == 'r') {
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if (pdes[1] != 1) {
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dup2(pdes[1], 1);
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dup2(pdes[1], 2); /* stderr, too! */
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close(pdes[1]);
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}
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close(pdes[0]);
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} else {
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if (pdes[0] != 0) {
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dup2(pdes[0], 0);
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close(pdes[0]);
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}
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close(pdes[1]);
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}
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environ = NULL;
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execv(gargv[0], gargv);
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_exit(1);
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}
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/* parent; assume fdopen can't fail... */
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if (*type == 'r') {
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iop = fdopen(pipe_fd = pdes[0], type);
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close(pdes[1]);
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} else {
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iop = fdopen(pipe_fd = pdes[1], type);
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close(pdes[0]);
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}
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pfree: for (argc = 1; argv[argc] != NULL; argc++) {
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blkfree((char **) argv[argc]);
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free((char *) argv[argc]);
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}
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return (iop);
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}
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int ftpd_pclose FUNCTION((iop), FILE *iop)
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{
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int status;
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pid_t pid;
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sigset_t omask, mask;
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sigemptyset(&mask);
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sigaddset(&mask, SIGINT);
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sigaddset(&mask, SIGQUIT);
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sigaddset(&mask, SIGHUP);
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/* pclose returns -1 if stream is not associated with a `popened' command,
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or, if already `pclosed'. */
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if ((child_pid < 0) || (fileno(iop) != pipe_fd))
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return (-1);
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fclose(iop);
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sigprocmask(SIG_BLOCK, &mask, &omask);
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while ((pid = wait(&status)) != child_pid && (pid != -1));
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sigprocmask(SIG_SETMASK, &omask, NULL);
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child_pid = -1;
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pipe_fd = -1;
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#if defined(WEXITSTATUS) && defined(WIFEXITED)
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if ((pid > 0) && WIFEXITED(status))
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return WEXITSTATUS(status);
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return -1;
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#else /* defined(WEXITSTATUS) && defined(WIFEXITED) */
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return (pid == -1 ? -1 : status.w_status);
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#endif /* defined(WEXITSTATUS) && defined(WIFEXITED) */
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}
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