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- /*
- * Copyright (c) 1988, 1993, 1994
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software written by Ken Arnold and
- * published in UNIX Review, Vol. 6, No. 8.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 4/6/94";
- #endif /* not lint */
-
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
-
- #include <sys/types.h>
- #include <sys/wait.h>
-
- #include <errno.h>
- #include <glob.h>
- #include <signal.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
-
- #include "extern.h"
-
- /*
- * Special version of popen which avoids call to shell. This ensures noone
- * may create a pipe to a hidden program as a side effect of a list or dir
- * command.
- */
-
- struct file_pid {
- FILE *file;
- pid_t pid;
- struct file_pid *next;
- };
-
- /* A linked list associating ftpd_popen'd FILEs with pids. */
- struct file_pid *file_pids = 0;
-
- FILE *
- ftpd_popen(program, type)
- char *program, *type;
- {
- char *cp;
- FILE *iop;
- struct file_pid *fpid;
- int argc, gargc, pdes[2], pid;
- char **pop, *argv[100], *gargv[1000];
-
- if (*type != 'r' && *type != 'w' || type[1])
- return (NULL);
-
- if (pipe(pdes) < 0)
- return (NULL);
-
- /* break up string into pieces */
- for (argc = 0, cp = program;; cp = NULL)
- if (!(argv[argc++] = strtok(cp, " \t\n")))
- break;
-
- /* glob each piece */
- gargv[0] = argv[0];
- for (gargc = argc = 1; argv[argc]; argc++) {
- glob_t gl;
- int flags = GLOB_NOCHECK;
-
- #ifdef GLOB_BRACE
- flags |= GLOB_BRACE;
- #endif
- #ifdef GLOB_QUOTE
- flags |= GLOB_QUOTE;
- #endif
- #ifdef GLOB_TILDE
- flags |= GLOB_TILDE;
- #endif
-
- memset(&gl, 0, sizeof(gl));
- if (glob(argv[argc], flags, NULL, &gl))
- gargv[gargc++] = strdup(argv[argc]);
- else
- for (pop = gl.gl_pathv; *pop; pop++)
- gargv[gargc++] = strdup(*pop);
- globfree(&gl);
- }
- gargv[gargc] = NULL;
-
- iop = NULL;
- switch(pid = vfork()) {
- case -1: /* error */
- (void)close(pdes[0]);
- (void)close(pdes[1]);
- goto pfree;
- /* NOTREACHED */
- case 0: /* child */
- if (*type == 'r') {
- if (pdes[1] != STDOUT_FILENO) {
- dup2(pdes[1], STDOUT_FILENO);
- (void)close(pdes[1]);
- }
- dup2(STDOUT_FILENO, STDERR_FILENO); /* stderr too! */
- (void)close(pdes[0]);
- } else {
- if (pdes[0] != STDIN_FILENO) {
- dup2(pdes[0], STDIN_FILENO);
- (void)close(pdes[0]);
- }
- (void)close(pdes[1]);
- }
- execv(gargv[0], gargv);
- _exit(1);
- }
- /* parent; assume fdopen can't fail... */
- if (*type == 'r') {
- iop = fdopen(pdes[0], type);
- (void)close(pdes[1]);
- } else {
- iop = fdopen(pdes[1], type);
- (void)close(pdes[0]);
- }
-
- fpid = malloc (sizeof (struct file_pid));
- if (fpid) {
- fpid->file = iop;
- fpid->pid = pid;
- fpid->next = file_pids;
- file_pids = fpid;
- }
-
- pfree: for (argc = 1; gargv[argc] != NULL; argc++)
- free(gargv[argc]);
-
- return (iop);
- }
-
- int
- ftpd_pclose(iop)
- FILE *iop;
- {
- struct file_pid *fpid = file_pids, *prev_fpid = 0;
- int fdes, omask, status;
- pid_t pid;
-
- /*
- * pclose returns -1 if stream is not associated with a
- * `popened' command, or, if already `pclosed'.
- */
- while (fpid && fpid->file != iop) {
- prev_fpid = fpid;
- fpid = fpid->next;
- }
- if (! fpid)
- return -1;
-
- if (prev_fpid)
- prev_fpid->next = fpid->next;
- else
- file_pids = fpid->next;
-
- (void)fclose(iop);
- omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
- while ((pid = waitpid(fpid->pid, &status, 0)) < 0 && errno == EINTR)
- continue;
-
- free (fpid);
-
- (void)sigsetmask(omask);
- if (pid < 0)
- return (pid);
- if (WIFEXITED(status))
- return (WEXITSTATUS(status));
- return (1);
- }
-