1/* 2 * Copyright (c) 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software written by Ken Arnold and 6 * published in UNIX Review, Vol. 6, No. 8. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 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. 23 * 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 34 * SUCH DAMAGE. 35 */ 36 37#ifndef lint 38#if 0 39static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 4/6/94"; 40#endif 41#endif /* not lint */ 42 43#include <sys/cdefs.h> 44__FBSDID("$FreeBSD: src/libexec/ftpd/popen.c,v 1.26 2004/11/18 13:46:29 yar Exp $"); 45 46#include <sys/types.h> 47#include <sys/wait.h> 48#include <netinet/in.h> 49 50#include <errno.h> 51#include <glob.h> 52#include <signal.h> 53#include <stdio.h> 54#include <stdlib.h> 55#include <string.h> 56#include <unistd.h> 57 58#include "extern.h" 59#include "pathnames.h" 60#include <syslog.h> 61#include <time.h> 62 63#define MAXUSRARGS 100 64#define MAXGLOBARGS 1000 65 66/* 67 * Special version of popen which avoids call to shell. This ensures noone 68 * may create a pipe to a hidden program as a side effect of a list or dir 69 * command. 70 */ 71static int *pids; 72static int fds; 73 74FILE * 75ftpd_popen(char *program, char *type) 76{ 77 char *cp; 78 FILE *iop; 79 int argc, gargc, pdes[2], pid; 80 char **pop, *argv[MAXUSRARGS], *gargv[MAXGLOBARGS]; 81 82 if (((*type != 'r') && (*type != 'w')) || type[1]) 83 return (NULL); 84 85 if (!pids) { 86 if ((fds = getdtablesize()) <= 0) 87 return (NULL); 88 if ((pids = calloc(fds, sizeof(int))) == NULL) 89 return (NULL); 90 } 91 if (pipe(pdes) < 0) 92 return (NULL); 93 94 /* break up string into pieces */ 95 for (argc = 0, cp = program; argc < MAXUSRARGS; cp = NULL) { 96 if (!(argv[argc++] = strtok(cp, " \t\n"))) 97 break; 98 } 99 argv[argc - 1] = NULL; 100 101 /* glob each piece */ 102 gargv[0] = argv[0]; 103 for (gargc = argc = 1; argv[argc] && gargc < (MAXGLOBARGS-1); argc++) { 104 glob_t gl; 105 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 106 107 memset(&gl, 0, sizeof(gl)); 108 gl.gl_matchc = MAXGLOBARGS; 109 flags |= GLOB_LIMIT; 110 if (glob(argv[argc], flags, NULL, &gl)) 111 gargv[gargc++] = strdup(argv[argc]); 112 else if (gl.gl_pathc > 0) { 113 for (pop = gl.gl_pathv; *pop && gargc < (MAXGLOBARGS-1); 114 pop++) 115 gargv[gargc++] = strdup(*pop); 116 } 117 globfree(&gl); 118 } 119 gargv[gargc] = NULL; 120 121 iop = NULL; 122 fflush(NULL); 123#ifdef BUILTIN_LS 124 pid = (strcmp(gargv[0], _PATH_LS) == 0) ? fork() : vfork(); 125#else 126 pid = fork(); 127#endif 128 switch(pid) { 129 case -1: /* error */ 130 (void)close(pdes[0]); 131 (void)close(pdes[1]); 132 goto pfree; 133 /* NOTREACHED */ 134 case 0: /* child */ 135 if (*type == 'r') { 136 if (pdes[1] != STDOUT_FILENO) { 137 dup2(pdes[1], STDOUT_FILENO); 138 (void)close(pdes[1]); 139 } 140 dup2(STDOUT_FILENO, STDERR_FILENO); /* stderr too! */ 141 (void)close(pdes[0]); 142 } else { 143 if (pdes[0] != STDIN_FILENO) { 144 dup2(pdes[0], STDIN_FILENO); 145 (void)close(pdes[0]); 146 } 147 (void)close(pdes[1]); 148 } 149#ifdef BUILTIN_LS 150 if (strcmp(gargv[0], _PATH_LS) == 0) { 151 /* Reset getopt for ls_main() */ 152 optreset = optind = optopt = 1; 153 /* Close syslogging to remove pwd.db missing msgs */ 154 closelog(); 155 /* Trigger to sense new /etc/localtime after chroot */ 156 if (getenv("TZ") == NULL) { 157 setenv("TZ", "", 0); 158 tzset(); 159 unsetenv("TZ"); 160 tzset(); 161 } 162 exit(ls_main(gargc, gargv)); 163 } 164#endif 165 execv(gargv[0], gargv); 166 _exit(1); 167 } 168 /* parent; assume fdopen can't fail... */ 169 if (*type == 'r') { 170 iop = fdopen(pdes[0], type); 171 (void)close(pdes[1]); 172 } else { 173 iop = fdopen(pdes[1], type); 174 (void)close(pdes[0]); 175 } 176 pids[fileno(iop)] = pid; 177 178pfree: for (argc = 1; gargv[argc] != NULL; argc++) 179 free(gargv[argc]); 180 181 return (iop); 182} 183 184int 185ftpd_pclose(FILE *iop) 186{ 187 int fdes, omask, status; 188 pid_t pid; 189 190 /* 191 * pclose returns -1 if stream is not associated with a 192 * `popened' command, or, if already `pclosed'. 193 */ 194 if (pids == NULL || pids[fdes = fileno(iop)] == 0) 195 return (-1); 196 (void)fclose(iop); 197 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP)); 198 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR) 199 continue; 200 (void)sigsetmask(omask); 201 pids[fdes] = 0; 202 if (pid < 0) 203 return (pid); 204 if (WIFEXITED(status)) 205 return (WEXITSTATUS(status)); 206 return (1); 207} 208