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 * @(#)popen.c 8.3 (Berkeley) 4/6/94 37 * $FreeBSD: src/libexec/ftpd/popen.c,v 1.26 2004/11/18 13:46:29 yar Exp $ 38 */ 39 40 #include <sys/types.h> 41 #include <sys/wait.h> 42 #include <netinet/in.h> 43 44 #include <errno.h> 45 #include <glob.h> 46 #include <signal.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <unistd.h> 51 52 #include "extern.h" 53 #include "pathnames.h" 54 #include <syslog.h> 55 #include <time.h> 56 57 #define MAXUSRARGS 100 58 #define MAXGLOBARGS 1000 59 60 /* 61 * Special version of popen which avoids call to shell. This ensures noone 62 * may create a pipe to a hidden program as a side effect of a list or dir 63 * command. 64 */ 65 static int *pids; 66 static int fds; 67 68 FILE * 69 ftpd_popen(char *program, char *type) 70 { 71 char *cp; 72 FILE *iop; 73 int argc, gargc, pdes[2], pid; 74 char **pop, *argv[MAXUSRARGS], *gargv[MAXGLOBARGS]; 75 76 if (((*type != 'r') && (*type != 'w')) || type[1]) 77 return (NULL); 78 79 if (!pids) { 80 if ((fds = getdtablesize()) <= 0) 81 return (NULL); 82 if ((pids = malloc(fds * sizeof(int))) == NULL) 83 return (NULL); 84 memset(pids, 0, fds * sizeof(int)); 85 } 86 if (pipe(pdes) < 0) 87 return (NULL); 88 89 /* break up string into pieces */ 90 for (argc = 0, cp = program; argc < MAXUSRARGS; cp = NULL) { 91 if (!(argv[argc++] = strtok(cp, " \t\n"))) 92 break; 93 } 94 argv[argc - 1] = NULL; 95 96 /* glob each piece */ 97 gargv[0] = argv[0]; 98 for (gargc = argc = 1; argv[argc] && gargc < (MAXGLOBARGS-1); argc++) { 99 glob_t gl; 100 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 101 102 memset(&gl, 0, sizeof(gl)); 103 gl.gl_matchc = MAXGLOBARGS; 104 /*flags |= GLOB_LIMIT;*/ 105 if (glob(argv[argc], flags, NULL, &gl)) 106 gargv[gargc++] = strdup(argv[argc]); 107 else 108 for (pop = gl.gl_pathv; *pop && gargc < (MAXGLOBARGS-1); 109 pop++) 110 gargv[gargc++] = strdup(*pop); 111 globfree(&gl); 112 } 113 gargv[gargc] = NULL; 114 115 iop = NULL; 116 fflush(NULL); 117 pid = (strcmp(gargv[0], _PATH_LS) == 0) ? fork() : vfork(); 118 switch(pid) { 119 case -1: /* error */ 120 close(pdes[0]); 121 close(pdes[1]); 122 goto pfree; 123 /* NOTREACHED */ 124 case 0: /* child */ 125 if (*type == 'r') { 126 if (pdes[1] != STDOUT_FILENO) { 127 dup2(pdes[1], STDOUT_FILENO); 128 close(pdes[1]); 129 } 130 dup2(STDOUT_FILENO, STDERR_FILENO); /* stderr too! */ 131 close(pdes[0]); 132 } else { 133 if (pdes[0] != STDIN_FILENO) { 134 dup2(pdes[0], STDIN_FILENO); 135 close(pdes[0]); 136 } 137 close(pdes[1]); 138 } 139 if (strcmp(gargv[0], _PATH_LS) == 0) { 140 /* Reset getopt for ls_main() */ 141 optreset = optind = optopt = 1; 142 /* Close syslogging to remove pwd.db missing msgs */ 143 closelog(); 144 /* Trigger to sense new /etc/localtime after chroot */ 145 if (getenv("TZ") == NULL) { 146 if (setenv("TZ", "", 0) == -1) 147 syslog(LOG_ERR, "setenv: cannot set TZ: %m"); 148 tzset(); 149 unsetenv("TZ"); 150 tzset(); 151 } 152 exit(ls_main(gargc, gargv)); 153 } 154 execv(gargv[0], gargv); 155 _exit(1); 156 } 157 /* parent; assume fdopen can't fail... */ 158 if (*type == 'r') { 159 iop = fdopen(pdes[0], type); 160 close(pdes[1]); 161 } else { 162 iop = fdopen(pdes[1], type); 163 close(pdes[0]); 164 } 165 pids[fileno(iop)] = pid; 166 167 pfree: for (argc = 1; gargv[argc] != NULL; argc++) 168 free(gargv[argc]); 169 170 return (iop); 171 } 172 173 int 174 ftpd_pclose(FILE *iop) 175 { 176 int fdes, omask, status; 177 pid_t pid; 178 179 /* 180 * pclose returns -1 if stream is not associated with a 181 * `popened' command, or, if already `pclosed'. 182 */ 183 if (pids == NULL || pids[fdes = fileno(iop)] == 0) 184 return (-1); 185 fclose(iop); 186 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP)); 187 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR) 188 continue; 189 sigsetmask(omask); 190 pids[fdes] = 0; 191 if (pid < 0) 192 return (pid); 193 if (WIFEXITED(status)) 194 return (WEXITSTATUS(status)); 195 return (1); 196 } 197