| /* |
| * 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 |
| #if 0 |
| static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 4/6/94"; |
| #endif |
| static const char rcsid[] = |
| "$FreeBSD: src/libexec/ftpd/popen.c,v 1.18.2.3 2001/08/09 00:53:18 mikeh Exp $"; |
| #endif /* not lint */ |
| |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <netinet/in.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" |
| #include "pathnames.h" |
| #include <syslog.h> |
| #include <time.h> |
| #include <varargs.h> |
| |
| #define MAXUSRARGS 100 |
| #define MAXGLOBARGS 1000 |
| |
| /* |
| * 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. |
| */ |
| static int *pids; |
| static int fds; |
| |
| FILE * |
| ftpd_popen(program, type) |
| char *program, *type; |
| { |
| char *cp; |
| FILE *iop; |
| int argc, gargc, pdes[2], pid; |
| char **pop, *argv[MAXUSRARGS], *gargv[MAXGLOBARGS]; |
| |
| if (((*type != 'r') && (*type != 'w')) || type[1]) |
| return (NULL); |
| |
| if (!pids) { |
| if ((fds = getdtablesize()) <= 0) |
| return (NULL); |
| if ((pids = (int *)malloc((u_int)(fds * sizeof(int)))) == NULL) |
| return (NULL); |
| memset(pids, 0, fds * sizeof(int)); |
| } |
| if (pipe(pdes) < 0) |
| return (NULL); |
| |
| /* break up string into pieces */ |
| for (argc = 0, cp = program; argc < MAXUSRARGS; cp = NULL) { |
| if (!(argv[argc++] = strtok(cp, " \t\n"))) |
| break; |
| } |
| argv[argc - 1] = NULL; |
| |
| /* glob each piece */ |
| gargv[0] = argv[0]; |
| for (gargc = argc = 1; argv[argc] && gargc < (MAXGLOBARGS-1); argc++) { |
| glob_t gl; |
| int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; |
| |
| memset(&gl, 0, sizeof(gl)); |
| gl.gl_matchc = MAXGLOBARGS; |
| flags |= GLOB_LIMIT; |
| if (glob(argv[argc], flags, NULL, &gl)) |
| gargv[gargc++] = strdup(argv[argc]); |
| else |
| for (pop = gl.gl_pathv; *pop && gargc < (MAXGLOBARGS-1); |
| pop++) |
| gargv[gargc++] = strdup(*pop); |
| globfree(&gl); |
| } |
| gargv[gargc] = NULL; |
| |
| iop = NULL; |
| fflush(NULL); |
| pid = (strcmp(gargv[0], _PATH_LS) == 0) ? fork() : vfork(); |
| switch(pid) { |
| 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]); |
| } |
| if (strcmp(gargv[0], _PATH_LS) == 0) { |
| /* Reset getopt for ls_main() */ |
| optreset = optind = optopt = 1; |
| /* Close syslogging to remove pwd.db missing msgs */ |
| closelog(); |
| /* Trigger to sense new /etc/localtime after chroot */ |
| if (getenv("TZ") == NULL) { |
| setenv("TZ", "", 0); |
| tzset(); |
| unsetenv("TZ"); |
| tzset(); |
| } |
| exit(ls_main(gargc, gargv)); |
| } |
| 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]); |
| } |
| pids[fileno(iop)] = pid; |
| |
| pfree: for (argc = 1; gargv[argc] != NULL; argc++) |
| free(gargv[argc]); |
| |
| return (iop); |
| } |
| |
| int |
| ftpd_pclose(iop) |
| FILE *iop; |
| { |
| int fdes, omask, status; |
| pid_t pid; |
| |
| /* |
| * pclose returns -1 if stream is not associated with a |
| * `popened' command, or, if already `pclosed'. |
| */ |
| if (pids == 0 || pids[fdes = fileno(iop)] == 0) |
| return (-1); |
| (void)fclose(iop); |
| omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP)); |
| while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR) |
| continue; |
| (void)sigsetmask(omask); |
| pids[fdes] = 0; |
| if (pid < 0) |
| return (pid); |
| if (WIFEXITED(status)) |
| return (WEXITSTATUS(status)); |
| return (1); |
| } |