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 1.18.2.3 2001/08/09 00:53:18 mikeh Exp $ 38 * $DragonFly: src/libexec/ftpd/popen.c,v 1.3 2006/01/12 13:43:10 corecode Exp $ 39 */ 40 41 #include <sys/types.h> 42 #include <sys/wait.h> 43 #include <netinet/in.h> 44 45 #include <errno.h> 46 #include <glob.h> 47 #include <signal.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 53 #include "extern.h" 54 #include "pathnames.h" 55 #include <syslog.h> 56 #include <time.h> 57 #include <varargs.h> 58 59 #define MAXUSRARGS 100 60 #define MAXGLOBARGS 1000 61 62 /* 63 * Special version of popen which avoids call to shell. This ensures noone 64 * may create a pipe to a hidden program as a side effect of a list or dir 65 * command. 66 */ 67 static int *pids; 68 static int fds; 69 70 FILE * 71 ftpd_popen(program, type) 72 char *program, *type; 73 { 74 char *cp; 75 FILE *iop; 76 int argc, gargc, pdes[2], pid; 77 char **pop, *argv[MAXUSRARGS], *gargv[MAXGLOBARGS]; 78 79 if (((*type != 'r') && (*type != 'w')) || type[1]) 80 return (NULL); 81 82 if (!pids) { 83 if ((fds = getdtablesize()) <= 0) 84 return (NULL); 85 if ((pids = (int *)malloc((u_int)(fds * sizeof(int)))) == NULL) 86 return (NULL); 87 memset(pids, 0, fds * sizeof(int)); 88 } 89 if (pipe(pdes) < 0) 90 return (NULL); 91 92 /* break up string into pieces */ 93 for (argc = 0, cp = program; argc < MAXUSRARGS; cp = NULL) { 94 if (!(argv[argc++] = strtok(cp, " \t\n"))) 95 break; 96 } 97 argv[argc - 1] = NULL; 98 99 /* glob each piece */ 100 gargv[0] = argv[0]; 101 for (gargc = argc = 1; argv[argc] && gargc < (MAXGLOBARGS-1); argc++) { 102 glob_t gl; 103 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 104 105 memset(&gl, 0, sizeof(gl)); 106 gl.gl_matchc = MAXGLOBARGS; 107 flags |= GLOB_LIMIT; 108 if (glob(argv[argc], flags, NULL, &gl)) 109 gargv[gargc++] = strdup(argv[argc]); 110 else 111 for (pop = gl.gl_pathv; *pop && gargc < (MAXGLOBARGS-1); 112 pop++) 113 gargv[gargc++] = strdup(*pop); 114 globfree(&gl); 115 } 116 gargv[gargc] = NULL; 117 118 iop = NULL; 119 fflush(NULL); 120 pid = (strcmp(gargv[0], _PATH_LS) == 0) ? fork() : vfork(); 121 switch(pid) { 122 case -1: /* error */ 123 (void)close(pdes[0]); 124 (void)close(pdes[1]); 125 goto pfree; 126 /* NOTREACHED */ 127 case 0: /* child */ 128 if (*type == 'r') { 129 if (pdes[1] != STDOUT_FILENO) { 130 dup2(pdes[1], STDOUT_FILENO); 131 (void)close(pdes[1]); 132 } 133 dup2(STDOUT_FILENO, STDERR_FILENO); /* stderr too! */ 134 (void)close(pdes[0]); 135 } else { 136 if (pdes[0] != STDIN_FILENO) { 137 dup2(pdes[0], STDIN_FILENO); 138 (void)close(pdes[0]); 139 } 140 (void)close(pdes[1]); 141 } 142 if (strcmp(gargv[0], _PATH_LS) == 0) { 143 /* Reset getopt for ls_main() */ 144 optreset = optind = optopt = 1; 145 /* Close syslogging to remove pwd.db missing msgs */ 146 closelog(); 147 /* Trigger to sense new /etc/localtime after chroot */ 148 if (getenv("TZ") == NULL) { 149 if (setenv("TZ", "", 0) == -1) 150 syslog(LOG_ERR, "setenv: cannot set TZ: %m"); 151 tzset(); 152 unsetenv("TZ"); 153 tzset(); 154 } 155 exit(ls_main(gargc, gargv)); 156 } 157 execv(gargv[0], gargv); 158 _exit(1); 159 } 160 /* parent; assume fdopen can't fail... */ 161 if (*type == 'r') { 162 iop = fdopen(pdes[0], type); 163 (void)close(pdes[1]); 164 } else { 165 iop = fdopen(pdes[1], type); 166 (void)close(pdes[0]); 167 } 168 pids[fileno(iop)] = pid; 169 170 pfree: for (argc = 1; gargv[argc] != NULL; argc++) 171 free(gargv[argc]); 172 173 return (iop); 174 } 175 176 int 177 ftpd_pclose(iop) 178 FILE *iop; 179 { 180 int fdes, omask, status; 181 pid_t pid; 182 183 /* 184 * pclose returns -1 if stream is not associated with a 185 * `popened' command, or, if already `pclosed'. 186 */ 187 if (pids == 0 || pids[fdes = fileno(iop)] == 0) 188 return (-1); 189 (void)fclose(iop); 190 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP)); 191 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR) 192 continue; 193 (void)sigsetmask(omask); 194 pids[fdes] = 0; 195 if (pid < 0) 196 return (pid); 197 if (WIFEXITED(status)) 198 return (WEXITSTATUS(status)); 199 return (1); 200 } 201