246 lines
7 KiB
C
246 lines
7 KiB
C
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/* $NetBSD: popen.c,v 1.37 2010/03/20 18:23:30 christos Exp $ */
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/*-
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* Copyright (c) 1999-2009 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Luke Mewburn.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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. 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 <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 4/6/94";
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#else
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__RCSID("$NetBSD: popen.c,v 1.37 2010/03/20 18:23:30 christos Exp $");
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <glob.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stringlist.h>
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#include <syslog.h>
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#include <unistd.h>
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#ifdef KERBEROS5
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#include <krb5/krb5.h>
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#endif
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#include "extern.h"
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#define INCR 100
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/*
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* Special version of popen which avoids call to shell. This ensures no-one
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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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* If stderrfd != -1, then send stderr of a read command there,
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* otherwise close stderr.
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*/
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static int *pids;
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static int fds;
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extern int ls_main(int, char *[]);
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FILE *
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ftpd_popen(const char *argv[], const char *ptype, int stderrfd)
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{
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FILE *iop;
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int argc, pdes[2], pid;
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volatile int isls;
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char **pop;
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StringList *sl;
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iop = NULL;
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isls = 0;
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if ((*ptype != 'r' && *ptype != 'w') || ptype[1])
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return (NULL);
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if (!pids) {
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if ((fds = getdtablesize()) <= 0)
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return (NULL);
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if ((pids = (int *)malloc((unsigned int)(fds * sizeof(int)))) == NULL)
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return (NULL);
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memset(pids, 0, fds * sizeof(int));
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}
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if (pipe(pdes) < 0)
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return (NULL);
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if ((sl = sl_init()) == NULL)
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goto pfree;
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/* glob each piece */
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if (sl_add(sl, ftpd_strdup(argv[0])) == -1)
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goto pfree;
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for (argc = 1; argv[argc]; argc++) {
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glob_t gl;
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int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT;
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memset(&gl, 0, sizeof(gl));
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if (glob(argv[argc], flags, NULL, &gl)
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|| gl.gl_pathv == NULL) {
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if (sl_add(sl, ftpd_strdup(argv[argc])) == -1) {
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globfree(&gl);
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goto pfree;
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}
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} else {
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for (pop = gl.gl_pathv; *pop; pop++) {
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if (sl_add(sl, ftpd_strdup(*pop)) == -1) {
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globfree(&gl);
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goto pfree;
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}
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}
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}
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globfree(&gl);
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}
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if (sl_add(sl, NULL) == -1)
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goto pfree;
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#ifndef NO_INTERNAL_LS
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isls = (strcmp(sl->sl_str[0], INTERNAL_LS) == 0);
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#endif
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pid = isls ? fork() : vfork();
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switch (pid) {
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case -1: /* error */
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(void)close(pdes[0]);
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(void)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 (*ptype == 'r') {
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if (pdes[1] != STDOUT_FILENO) {
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dup2(pdes[1], STDOUT_FILENO);
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(void)close(pdes[1]);
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}
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if (stderrfd == -1)
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(void)close(STDERR_FILENO);
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else
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dup2(stderrfd, STDERR_FILENO);
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(void)close(pdes[0]);
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} else {
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if (pdes[0] != STDIN_FILENO) {
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dup2(pdes[0], STDIN_FILENO);
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(void)close(pdes[0]);
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}
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(void)close(pdes[1]);
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}
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#ifndef NO_INTERNAL_LS
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if (isls) { /* use internal ls */
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optreset = optind = optopt = 1;
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closelog();
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exit(ls_main(sl->sl_cur - 1, sl->sl_str));
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}
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#endif
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execv(sl->sl_str[0], sl->sl_str);
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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 (*ptype == 'r') {
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iop = fdopen(pdes[0], ptype);
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(void)close(pdes[1]);
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} else {
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iop = fdopen(pdes[1], ptype);
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(void)close(pdes[0]);
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}
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pids[fileno(iop)] = pid;
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pfree:
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if (sl)
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sl_free(sl, 1);
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return (iop);
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}
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int
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ftpd_pclose(FILE *iop)
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{
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int fdes, status;
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pid_t pid;
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sigset_t nsigset, osigset;
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/*
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* pclose returns -1 if stream is not associated with a
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* `popened' command, or, if already `pclosed'.
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*/
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if (pids == 0 || pids[fdes = fileno(iop)] == 0)
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return (-1);
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(void)fclose(iop);
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sigemptyset(&nsigset);
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sigaddset(&nsigset, SIGINT);
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sigaddset(&nsigset, SIGQUIT);
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sigaddset(&nsigset, SIGHUP);
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sigprocmask(SIG_BLOCK, &nsigset, &osigset);
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while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR)
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continue;
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sigprocmask(SIG_SETMASK, &osigset, NULL);
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pids[fdes] = 0;
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if (pid < 0)
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return (pid);
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if (WIFEXITED(status))
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return (WEXITSTATUS(status));
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return (1);
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}
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