1 /* $NetBSD: popen.c,v 1.8 1997/06/18 19:05:52 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software written by Ken Arnold and 8 * published in UNIX Review, Vol. 6, No. 8. 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 University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 */ 39 40 #include <sys/cdefs.h> 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 4/6/94"; 44 #else 45 __RCSID("$NetBSD: popen.c,v 1.8 1997/06/18 19:05:52 christos Exp $"); 46 #endif 47 #endif /* not lint */ 48 49 #include <sys/types.h> 50 #include <sys/wait.h> 51 52 #include <errno.h> 53 #include <glob.h> 54 #include <signal.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #include "extern.h" 61 62 #define INCR 100 63 /* 64 * Special version of popen which avoids call to shell. This ensures noone 65 * may create a pipe to a hidden program as a side effect of a list or dir 66 * command. 67 */ 68 static int *pids; 69 static int fds; 70 71 FILE * 72 ftpd_popen(program, type, nostderr) 73 char *program, *type; 74 int nostderr; 75 { 76 char *cp; 77 FILE *iop = NULL; 78 int argc, gargc, pdes[2], pid; 79 char **pop, **np; 80 char **argv = NULL, **gargv = NULL; 81 size_t nargc = 100, ngargc = 100; 82 #ifdef __GNUC__ 83 (void) &iop; 84 (void) &gargc; 85 (void) &gargv; 86 (void) &argv; 87 #endif 88 89 if ((*type != 'r' && *type != 'w') || type[1]) 90 return (NULL); 91 92 if (!pids) { 93 if ((fds = getdtablesize()) <= 0) 94 return (NULL); 95 if ((pids = (int *)malloc((u_int)(fds * sizeof(int)))) == NULL) 96 return (NULL); 97 memset(pids, 0, fds * sizeof(int)); 98 } 99 if (pipe(pdes) < 0) 100 return (NULL); 101 102 if ((argv = malloc(nargc * sizeof(char *))) == NULL) 103 return NULL; 104 105 #define CHECKMORE(c, v, n) \ 106 if (c >= n + 2) { \ 107 n += INCR; \ 108 if ((np = realloc(v, n * sizeof(char *))) == NULL) \ 109 goto pfree; \ 110 else \ 111 v = np; \ 112 } 113 114 /* break up string into pieces */ 115 for (argc = 0, cp = program;; cp = NULL) { 116 CHECKMORE(argc, argv, nargc) 117 if (!(argv[argc++] = strtok(cp, " \t\n"))) 118 break; 119 } 120 121 if ((gargv = malloc(ngargc * sizeof(char *))) == NULL) 122 goto pfree; 123 124 /* glob each piece */ 125 gargv[0] = argv[0]; 126 for (gargc = argc = 1; argv[argc]; argc++) { 127 glob_t gl; 128 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 129 130 memset(&gl, 0, sizeof(gl)); 131 if (glob(argv[argc], flags, NULL, &gl)) { 132 CHECKMORE(gargc, gargv, ngargc) 133 if ((gargv[gargc++] = strdup(argv[argc])) == NULL) 134 goto pfree; 135 } 136 else 137 for (pop = gl.gl_pathv; *pop; pop++) { 138 CHECKMORE(gargc, gargv, ngargc) 139 if ((gargv[gargc++] = strdup(*pop)) == NULL) 140 goto pfree; 141 } 142 globfree(&gl); 143 } 144 gargv[gargc] = NULL; 145 146 switch(pid = vfork()) { 147 case -1: /* error */ 148 (void)close(pdes[0]); 149 (void)close(pdes[1]); 150 goto pfree; 151 /* NOTREACHED */ 152 case 0: /* child */ 153 if (*type == 'r') { 154 if (pdes[1] != STDOUT_FILENO) { 155 dup2(pdes[1], STDOUT_FILENO); 156 (void)close(pdes[1]); 157 } 158 if (nostderr) 159 (void)close(STDERR_FILENO); 160 else /* stderr too! */ 161 dup2(STDOUT_FILENO, STDERR_FILENO); 162 (void)close(pdes[0]); 163 } else { 164 if (pdes[0] != STDIN_FILENO) { 165 dup2(pdes[0], STDIN_FILENO); 166 (void)close(pdes[0]); 167 } 168 (void)close(pdes[1]); 169 } 170 execv(gargv[0], gargv); 171 _exit(1); 172 } 173 /* parent; assume fdopen can't fail... */ 174 if (*type == 'r') { 175 iop = fdopen(pdes[0], type); 176 (void)close(pdes[1]); 177 } else { 178 iop = fdopen(pdes[1], type); 179 (void)close(pdes[0]); 180 } 181 pids[fileno(iop)] = pid; 182 183 pfree: if (gargv) { 184 for (argc = 1; argc < gargc; argc++) 185 free(gargv[argc]); 186 free(gargv); 187 } 188 if (argv) 189 free(argv); 190 191 return (iop); 192 } 193 194 int 195 ftpd_pclose(iop) 196 FILE *iop; 197 { 198 int fdes, status; 199 pid_t pid; 200 sigset_t sigset, osigset; 201 202 /* 203 * pclose returns -1 if stream is not associated with a 204 * `popened' command, or, if already `pclosed'. 205 */ 206 if (pids == 0 || pids[fdes = fileno(iop)] == 0) 207 return (-1); 208 (void)fclose(iop); 209 sigemptyset(&sigset); 210 sigaddset(&sigset, SIGINT); 211 sigaddset(&sigset, SIGQUIT); 212 sigaddset(&sigset, SIGHUP); 213 sigprocmask(SIG_BLOCK, &sigset, &osigset); 214 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR) 215 continue; 216 sigprocmask(SIG_SETMASK, &osigset, NULL); 217 pids[fdes] = 0; 218 if (pid < 0) 219 return (pid); 220 if (WIFEXITED(status)) 221 return (WEXITSTATUS(status)); 222 return (1); 223 } 224