popen.c revision 1.35
1 /* $NetBSD: popen.c,v 1.35 2009/03/15 07:48:36 lukem 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 1.35 2009/03/15 07:48:36 lukem 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, isls; 112 char **pop; 113 StringList *sl; 114 115 iop = NULL; 116 isls = 0; 117 if ((*ptype != 'r' && *ptype != 'w') || ptype[1]) 118 return (NULL); 119 120 if (!pids) { 121 if ((fds = getdtablesize()) <= 0) 122 return (NULL); 123 if ((pids = (int *)malloc((unsigned int)(fds * sizeof(int)))) == NULL) 124 return (NULL); 125 memset(pids, 0, fds * sizeof(int)); 126 } 127 if (pipe(pdes) < 0) 128 return (NULL); 129 130 if ((sl = sl_init()) == NULL) 131 goto pfree; 132 133 /* glob each piece */ 134 if (sl_add(sl, ftpd_strdup(argv[0])) == -1) 135 goto pfree; 136 for (argc = 1; argv[argc]; argc++) { 137 glob_t gl; 138 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT; 139 140 memset(&gl, 0, sizeof(gl)); 141 if (glob(argv[argc], flags, NULL, &gl)) { 142 if (sl_add(sl, ftpd_strdup(argv[argc])) == -1) { 143 globfree(&gl); 144 goto pfree; 145 } 146 } else { 147 for (pop = gl.gl_pathv; *pop; pop++) { 148 if (sl_add(sl, ftpd_strdup(*pop)) == -1) { 149 globfree(&gl); 150 goto pfree; 151 } 152 } 153 } 154 globfree(&gl); 155 } 156 if (sl_add(sl, NULL) == -1) 157 goto pfree; 158 159 #ifndef NO_INTERNAL_LS 160 isls = (strcmp(sl->sl_str[0], INTERNAL_LS) == 0); 161 #endif 162 163 pid = isls ? fork() : vfork(); 164 switch (pid) { 165 case -1: /* error */ 166 (void)close(pdes[0]); 167 (void)close(pdes[1]); 168 goto pfree; 169 /* NOTREACHED */ 170 case 0: /* child */ 171 if (*ptype == 'r') { 172 if (pdes[1] != STDOUT_FILENO) { 173 dup2(pdes[1], STDOUT_FILENO); 174 (void)close(pdes[1]); 175 } 176 if (stderrfd == -1) 177 (void)close(STDERR_FILENO); 178 else 179 dup2(stderrfd, STDERR_FILENO); 180 (void)close(pdes[0]); 181 } else { 182 if (pdes[0] != STDIN_FILENO) { 183 dup2(pdes[0], STDIN_FILENO); 184 (void)close(pdes[0]); 185 } 186 (void)close(pdes[1]); 187 } 188 #ifndef NO_INTERNAL_LS 189 if (isls) { /* use internal ls */ 190 optreset = optind = optopt = 1; 191 closelog(); 192 exit(ls_main(sl->sl_cur - 1, sl->sl_str)); 193 } 194 #endif 195 196 execv(sl->sl_str[0], sl->sl_str); 197 _exit(1); 198 } 199 /* parent; assume fdopen can't fail... */ 200 if (*ptype == 'r') { 201 iop = fdopen(pdes[0], ptype); 202 (void)close(pdes[1]); 203 } else { 204 iop = fdopen(pdes[1], ptype); 205 (void)close(pdes[0]); 206 } 207 pids[fileno(iop)] = pid; 208 209 pfree: 210 if (sl) 211 sl_free(sl, 1); 212 return (iop); 213 } 214 215 int 216 ftpd_pclose(FILE *iop) 217 { 218 int fdes, status; 219 pid_t pid; 220 sigset_t nsigset, osigset; 221 222 /* 223 * pclose returns -1 if stream is not associated with a 224 * `popened' command, or, if already `pclosed'. 225 */ 226 if (pids == 0 || pids[fdes = fileno(iop)] == 0) 227 return (-1); 228 (void)fclose(iop); 229 sigemptyset(&nsigset); 230 sigaddset(&nsigset, SIGINT); 231 sigaddset(&nsigset, SIGQUIT); 232 sigaddset(&nsigset, SIGHUP); 233 sigprocmask(SIG_BLOCK, &nsigset, &osigset); 234 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR) 235 continue; 236 sigprocmask(SIG_SETMASK, &osigset, NULL); 237 pids[fdes] = 0; 238 if (pid < 0) 239 return (pid); 240 if (WIFEXITED(status)) 241 return (WEXITSTATUS(status)); 242 return (1); 243 } 244
Indexes created Thu Oct 02 10:09:58 GMT 2025