1 /* $NetBSD: popen.c,v 1.31 2006/02/01 14:20:14 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1999-2004 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1988, 1993, 1994 41 * The Regents of the University of California. All rights reserved. 42 * 43 * This code is derived from software written by Ken Arnold and 44 * published in UNIX Review, Vol. 6, No. 8. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice, this list of conditions and the following disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 3. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 */ 71 72 #include <sys/cdefs.h> 73 #ifndef lint 74 #if 0 75 static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 4/6/94"; 76 #else 77 __RCSID("$NetBSD: popen.c,v 1.31 2006/02/01 14:20:14 christos Exp $"); 78 #endif 79 #endif /* not lint */ 80 81 #include <sys/types.h> 82 #include <sys/param.h> 83 #include <sys/wait.h> 84 85 #include <errno.h> 86 #include <glob.h> 87 #include <signal.h> 88 #include <stdio.h> 89 #include <stdlib.h> 90 #include <string.h> 91 #include <stringlist.h> 92 #include <syslog.h> 93 #include <unistd.h> 94 95 #ifdef KERBEROS5 96 #include <krb5/krb5.h> 97 #endif 98 99 #include "extern.h" 100 101 #define INCR 100 102 /* 103 * Special version of popen which avoids call to shell. This ensures no-one 104 * may create a pipe to a hidden program as a side effect of a list or dir 105 * command. 106 * If stderrfd != -1, then send stderr of a read command there, 107 * otherwise close stderr. 108 */ 109 static int *pids; 110 static int fds; 111 112 extern int ls_main(int, char *[]); 113 114 FILE * 115 ftpd_popen(char *argv[], const char *ptype, int stderrfd) 116 { 117 FILE *iop; 118 int argc, pdes[2], pid, isls; 119 char **pop; 120 StringList *sl; 121 122 iop = NULL; 123 isls = 0; 124 if ((*ptype != 'r' && *ptype != 'w') || ptype[1]) 125 return (NULL); 126 127 if (!pids) { 128 if ((fds = getdtablesize()) <= 0) 129 return (NULL); 130 if ((pids = (int *)malloc((u_int)(fds * sizeof(int)))) == NULL) 131 return (NULL); 132 memset(pids, 0, fds * sizeof(int)); 133 } 134 if (pipe(pdes) < 0) 135 return (NULL); 136 137 if ((sl = sl_init()) == NULL) 138 goto pfree; 139 140 /* glob each piece */ 141 if (sl_add(sl, ftpd_strdup(argv[0])) == -1) 142 goto pfree; 143 for (argc = 1; argv[argc]; argc++) { 144 glob_t gl; 145 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT; 146 147 memset(&gl, 0, sizeof(gl)); 148 if (glob(argv[argc], flags, NULL, &gl)) { 149 if (sl_add(sl, ftpd_strdup(argv[argc])) == -1) { 150 globfree(&gl); 151 goto pfree; 152 } 153 } else { 154 for (pop = gl.gl_pathv; *pop; pop++) { 155 if (sl_add(sl, ftpd_strdup(*pop)) == -1) { 156 globfree(&gl); 157 goto pfree; 158 } 159 } 160 } 161 globfree(&gl); 162 } 163 if (sl_add(sl, NULL) == -1) 164 goto pfree; 165 166 #ifndef NO_INTERNAL_LS 167 isls = (strcmp(sl->sl_str[0], INTERNAL_LS) == 0); 168 #endif 169 170 pid = isls ? fork() : vfork(); 171 switch (pid) { 172 case -1: /* error */ 173 (void)close(pdes[0]); 174 (void)close(pdes[1]); 175 goto pfree; 176 /* NOTREACHED */ 177 case 0: /* child */ 178 if (*ptype == 'r') { 179 if (pdes[1] != STDOUT_FILENO) { 180 dup2(pdes[1], STDOUT_FILENO); 181 (void)close(pdes[1]); 182 } 183 if (stderrfd == -1) 184 (void)close(STDERR_FILENO); 185 else 186 dup2(stderrfd, STDERR_FILENO); 187 (void)close(pdes[0]); 188 } else { 189 if (pdes[0] != STDIN_FILENO) { 190 dup2(pdes[0], STDIN_FILENO); 191 (void)close(pdes[0]); 192 } 193 (void)close(pdes[1]); 194 } 195 #ifndef NO_INTERNAL_LS 196 if (isls) { /* use internal ls */ 197 optreset = optind = optopt = 1; 198 closelog(); 199 exit(ls_main(sl->sl_cur - 1, sl->sl_str)); 200 } 201 #endif 202 203 execv(sl->sl_str[0], sl->sl_str); 204 _exit(1); 205 } 206 /* parent; assume fdopen can't fail... */ 207 if (*ptype == 'r') { 208 iop = fdopen(pdes[0], ptype); 209 (void)close(pdes[1]); 210 } else { 211 iop = fdopen(pdes[1], ptype); 212 (void)close(pdes[0]); 213 } 214 pids[fileno(iop)] = pid; 215 216 pfree: 217 if (sl) 218 sl_free(sl, 1); 219 return (iop); 220 } 221 222 int 223 ftpd_pclose(FILE *iop) 224 { 225 int fdes, status; 226 pid_t pid; 227 sigset_t nsigset, osigset; 228 229 /* 230 * pclose returns -1 if stream is not associated with a 231 * `popened' command, or, if already `pclosed'. 232 */ 233 if (pids == 0 || pids[fdes = fileno(iop)] == 0) 234 return (-1); 235 (void)fclose(iop); 236 sigemptyset(&nsigset); 237 sigaddset(&nsigset, SIGINT); 238 sigaddset(&nsigset, SIGQUIT); 239 sigaddset(&nsigset, SIGHUP); 240 sigprocmask(SIG_BLOCK, &nsigset, &osigset); 241 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR) 242 continue; 243 sigprocmask(SIG_SETMASK, &osigset, NULL); 244 pids[fdes] = 0; 245 if (pid < 0) 246 return (pid); 247 if (WIFEXITED(status)) 248 return (WEXITSTATUS(status)); 249 return (1); 250 } 251