popen.c revision 1.21
1 /* $NetBSD: popen.c,v 1.21 2000/05/20 02:20:19 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 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. All advertising materials mentioning features or use of this software 55 * must display the following acknowledgement: 56 * This product includes software developed by the University of 57 * California, Berkeley and its contributors. 58 * 4. Neither the name of the University nor the names of its contributors 59 * may be used to endorse or promote products derived from this software 60 * without specific prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 72 * SUCH DAMAGE. 73 * 74 */ 75 76 #include <sys/cdefs.h> 77 #ifndef lint 78 #if 0 79 static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 4/6/94"; 80 #else 81 __RCSID("$NetBSD: popen.c,v 1.21 2000/05/20 02:20:19 lukem Exp $"); 82 #endif 83 #endif /* not lint */ 84 85 #include <sys/types.h> 86 #include <sys/param.h> 87 #include <sys/wait.h> 88 89 #include <errno.h> 90 #include <glob.h> 91 #include <setjmp.h> 92 #include <signal.h> 93 #include <stdio.h> 94 #include <stdlib.h> 95 #include <string.h> 96 #include <stringlist.h> 97 #include <syslog.h> 98 #include <unistd.h> 99 100 #ifdef KERBEROS5 101 #include <krb5/krb5.h> 102 #endif 103 104 #include "extern.h" 105 106 #define INCR 100 107 /* 108 * Special version of popen which avoids call to shell. This ensures no-one 109 * may create a pipe to a hidden program as a side effect of a list or dir 110 * command. 111 * If stderrfd != -1, then send stderr of a read command there, 112 * otherwise close stderr. 113 */ 114 static int *pids; 115 static int fds; 116 117 extern int ls_main(int, char *[]); 118 119 FILE * 120 ftpd_popen(char *argv[], const char *type, int stderrfd) 121 { 122 FILE *iop; 123 int argc, pdes[2], pid, isls; 124 char **pop; 125 StringList *sl; 126 127 iop = NULL; 128 isls = 0; 129 if ((*type != 'r' && *type != 'w') || type[1]) 130 return (NULL); 131 132 if (!pids) { 133 if ((fds = getdtablesize()) <= 0) 134 return (NULL); 135 if ((pids = (int *)malloc((u_int)(fds * sizeof(int)))) == NULL) 136 return (NULL); 137 memset(pids, 0, fds * sizeof(int)); 138 } 139 if (pipe(pdes) < 0) 140 return (NULL); 141 142 if ((sl = sl_init()) == NULL) 143 goto pfree; 144 145 /* glob each piece */ 146 if (sl_add(sl, xstrdup(argv[0])) == -1) 147 goto pfree; 148 for (argc = 1; argv[argc]; argc++) { 149 glob_t gl; 150 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 151 152 memset(&gl, 0, sizeof(gl)); 153 if (glob(argv[argc], flags, NULL, &gl)) { 154 if (sl_add(sl, xstrdup(argv[argc])) == -1) 155 goto pfree; 156 } else 157 for (pop = gl.gl_pathv; *pop; pop++) { 158 if (sl_add(sl, xstrdup(*pop)) == -1) 159 goto pfree; 160 } 161 globfree(&gl); 162 } 163 if (sl_add(sl, NULL) == -1) 164 goto pfree; 165 166 isls = (strcmp(sl->sl_str[0], INTERNAL_LS) == 0); 167 168 pid = isls ? fork() : vfork(); 169 switch (pid) { 170 case -1: /* error */ 171 (void)close(pdes[0]); 172 (void)close(pdes[1]); 173 goto pfree; 174 /* NOTREACHED */ 175 case 0: /* child */ 176 if (*type == 'r') { 177 if (pdes[1] != STDOUT_FILENO) { 178 dup2(pdes[1], STDOUT_FILENO); 179 (void)close(pdes[1]); 180 } 181 if (stderrfd == -1) 182 (void)close(STDERR_FILENO); 183 else 184 dup2(stderrfd, STDERR_FILENO); 185 (void)close(pdes[0]); 186 } else { 187 if (pdes[0] != STDIN_FILENO) { 188 dup2(pdes[0], STDIN_FILENO); 189 (void)close(pdes[0]); 190 } 191 (void)close(pdes[1]); 192 } 193 if (isls) { /* use internal ls */ 194 optreset = optind = optopt = 1; 195 closelog(); 196 exit(ls_main(sl->sl_cur - 1, sl->sl_str)); 197 } 198 execv(sl->sl_str[0], sl->sl_str); 199 _exit(1); 200 } 201 /* parent; assume fdopen can't fail... */ 202 if (*type == 'r') { 203 iop = fdopen(pdes[0], type); 204 (void)close(pdes[1]); 205 } else { 206 iop = fdopen(pdes[1], type); 207 (void)close(pdes[0]); 208 } 209 pids[fileno(iop)] = pid; 210 211 pfree: if (sl) 212 sl_free(sl, 1); 213 return (iop); 214 } 215 216 int 217 ftpd_pclose(FILE *iop) 218 { 219 int fdes, status; 220 pid_t pid; 221 sigset_t sigset, osigset; 222 223 /* 224 * pclose returns -1 if stream is not associated with a 225 * `popened' command, or, if already `pclosed'. 226 */ 227 if (pids == 0 || pids[fdes = fileno(iop)] == 0) 228 return (-1); 229 (void)fclose(iop); 230 sigemptyset(&sigset); 231 sigaddset(&sigset, SIGINT); 232 sigaddset(&sigset, SIGQUIT); 233 sigaddset(&sigset, SIGHUP); 234 sigprocmask(SIG_BLOCK, &sigset, &osigset); 235 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR) 236 continue; 237 sigprocmask(SIG_SETMASK, &osigset, NULL); 238 pids[fdes] = 0; 239 if (pid < 0) 240 return (pid); 241 if (WIFEXITED(status)) 242 return (WEXITSTATUS(status)); 243 return (1); 244 } 245
Indexes created Thu Oct 02 10:09:58 GMT 2025