1 /* $NetBSD: popen.c,v 1.37 2010/03/20 18:23:30 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1999-2009 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Luke Mewburn. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1988, 1993, 1994 34 * The Regents of the University of California. All rights reserved. 35 * 36 * This code is derived from software written by Ken Arnold and 37 * published in UNIX Review, Vol. 6, No. 8. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. Neither the name of the University nor the names of its contributors 48 * may be used to endorse or promote products derived from this software 49 * without specific prior written permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 * 63 */ 64 65 #include <sys/cdefs.h> 66 #ifndef lint 67 #if 0 68 static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 4/6/94"; 69 #else 70 __RCSID("$NetBSD: popen.c,v 1.37 2010/03/20 18:23:30 christos Exp $"); 71 #endif 72 #endif /* not lint */ 73 74 #include <sys/types.h> 75 #include <sys/param.h> 76 #include <sys/wait.h> 77 78 #include <errno.h> 79 #include <glob.h> 80 #include <signal.h> 81 #include <stdio.h> 82 #include <stdlib.h> 83 #include <string.h> 84 #include <stringlist.h> 85 #include <syslog.h> 86 #include <unistd.h> 87 88 #ifdef KERBEROS5 89 #include <krb5/krb5.h> 90 #endif 91 92 #include "extern.h" 93 94 #define INCR 100 95 /* 96 * Special version of popen which avoids call to shell. This ensures no-one 97 * may create a pipe to a hidden program as a side effect of a list or dir 98 * command. 99 * If stderrfd != -1, then send stderr of a read command there, 100 * otherwise close stderr. 101 */ 102 static int *pids; 103 static int fds; 104 105 extern int ls_main(int, char *[]); 106 107 FILE * 108 ftpd_popen(const char *argv[], const char *ptype, int stderrfd) 109 { 110 FILE *iop; 111 int argc, pdes[2], pid; 112 volatile int isls; 113 char **pop; 114 StringList *sl; 115 116 iop = NULL; 117 isls = 0; 118 if ((*ptype != 'r' && *ptype != 'w') || ptype[1]) 119 return (NULL); 120 121 if (!pids) { 122 if ((fds = getdtablesize()) <= 0) 123 return (NULL); 124 if ((pids = (int *)malloc((unsigned int)(fds * sizeof(int)))) == NULL) 125 return (NULL); 126 memset(pids, 0, fds * sizeof(int)); 127 } 128 if (pipe(pdes) < 0) 129 return (NULL); 130 131 if ((sl = sl_init()) == NULL) 132 goto pfree; 133 134 /* glob each piece */ 135 if (sl_add(sl, ftpd_strdup(argv[0])) == -1) 136 goto pfree; 137 for (argc = 1; argv[argc]; argc++) { 138 glob_t gl; 139 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT; 140 141 memset(&gl, 0, sizeof(gl)); 142 if (glob(argv[argc], flags, NULL, &gl) 143 || gl.gl_pathv == NULL) { 144 if (sl_add(sl, ftpd_strdup(argv[argc])) == -1) { 145 globfree(&gl); 146 goto pfree; 147 } 148 } else { 149 for (pop = gl.gl_pathv; *pop; pop++) { 150 if (sl_add(sl, ftpd_strdup(*pop)) == -1) { 151 globfree(&gl); 152 goto pfree; 153 } 154 } 155 } 156 globfree(&gl); 157 } 158 if (sl_add(sl, NULL) == -1) 159 goto pfree; 160 161 #ifndef NO_INTERNAL_LS 162 isls = (strcmp(sl->sl_str[0], INTERNAL_LS) == 0); 163 #endif 164 165 pid = isls ? fork() : vfork(); 166 switch (pid) { 167 case -1: /* error */ 168 (void)close(pdes[0]); 169 (void)close(pdes[1]); 170 goto pfree; 171 /* NOTREACHED */ 172 case 0: /* child */ 173 if (*ptype == 'r') { 174 if (pdes[1] != STDOUT_FILENO) { 175 dup2(pdes[1], STDOUT_FILENO); 176 (void)close(pdes[1]); 177 } 178 if (stderrfd == -1) 179 (void)close(STDERR_FILENO); 180 else 181 dup2(stderrfd, STDERR_FILENO); 182 (void)close(pdes[0]); 183 } else { 184 if (pdes[0] != STDIN_FILENO) { 185 dup2(pdes[0], STDIN_FILENO); 186 (void)close(pdes[0]); 187 } 188 (void)close(pdes[1]); 189 } 190 #ifndef NO_INTERNAL_LS 191 if (isls) { /* use internal ls */ 192 optreset = optind = optopt = 1; 193 closelog(); 194 exit(ls_main(sl->sl_cur - 1, sl->sl_str)); 195 } 196 #endif 197 198 execv(sl->sl_str[0], sl->sl_str); 199 _exit(1); 200 } 201 /* parent; assume fdopen can't fail... */ 202 if (*ptype == 'r') { 203 iop = fdopen(pdes[0], ptype); 204 (void)close(pdes[1]); 205 } else { 206 iop = fdopen(pdes[1], ptype); 207 (void)close(pdes[0]); 208 } 209 pids[fileno(iop)] = pid; 210 211 pfree: 212 if (sl) 213 sl_free(sl, 1); 214 return (iop); 215 } 216 217 int 218 ftpd_pclose(FILE *iop) 219 { 220 int fdes, status; 221 pid_t pid; 222 sigset_t nsigset, osigset; 223 224 /* 225 * pclose returns -1 if stream is not associated with a 226 * `popened' command, or, if already `pclosed'. 227 */ 228 if (pids == 0 || pids[fdes = fileno(iop)] == 0) 229 return (-1); 230 (void)fclose(iop); 231 sigemptyset(&nsigset); 232 sigaddset(&nsigset, SIGINT); 233 sigaddset(&nsigset, SIGQUIT); 234 sigaddset(&nsigset, SIGHUP); 235 sigprocmask(SIG_BLOCK, &nsigset, &osigset); 236 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR) 237 continue; 238 sigprocmask(SIG_SETMASK, &osigset, NULL); 239 pids[fdes] = 0; 240 if (pid < 0) 241 return (pid); 242 if (WIFEXITED(status)) 243 return (WEXITSTATUS(status)); 244 return (1); 245 } 246