1 /* 2 * Copyright (c) 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software written by Ken Arnold and 6 * published in UNIX Review, Vol. 6, No. 8. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $Id: popen.c,v 1.7 1997/02/22 14:21:31 peter Exp $ 37 */ 38 39 #if 0 40 #ifndef lint 41 static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 4/6/94"; 42 #endif /* not lint */ 43 #endif 44 45 #include <sys/types.h> 46 #include <sys/wait.h> 47 48 #include <errno.h> 49 #include <glob.h> 50 #include <signal.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 #include "extern.h" 57 #ifdef INTERNAL_LS 58 #include "pathnames.h" 59 #endif 60 61 #define MAXUSRARGS 100 62 #define MAXGLOBARGS 1000 63 64 /* 65 * Special version of popen which avoids call to shell. This ensures noone 66 * may create a pipe to a hidden program as a side effect of a list or dir 67 * command. 68 */ 69 static int *pids; 70 static int fds; 71 72 FILE * 73 ftpd_popen(program, type) 74 char *program, *type; 75 { 76 char *cp; 77 FILE *iop; 78 int argc, gargc, pdes[2], pid; 79 char **pop, *argv[MAXUSRARGS], *gargv[MAXGLOBARGS]; 80 81 if (((*type != 'r') && (*type != 'w')) || type[1]) 82 return (NULL); 83 84 if (!pids) { 85 if ((fds = getdtablesize()) <= 0) 86 return (NULL); 87 if ((pids = (int *)malloc((u_int)(fds * sizeof(int)))) == NULL) 88 return (NULL); 89 memset(pids, 0, fds * sizeof(int)); 90 } 91 if (pipe(pdes) < 0) 92 return (NULL); 93 94 /* break up string into pieces */ 95 for (argc = 0, cp = program; argc < MAXUSRARGS; cp = NULL) 96 if (!(argv[argc++] = strtok(cp, " \t\n"))) 97 break; 98 99 /* glob each piece */ 100 gargv[0] = argv[0]; 101 for (gargc = argc = 1; argv[argc] && gargc < (MAXGLOBARGS-1); argc++) { 102 glob_t gl; 103 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 104 105 memset(&gl, 0, sizeof(gl)); 106 if (glob(argv[argc], flags, NULL, &gl)) 107 gargv[gargc++] = strdup(argv[argc]); 108 else 109 for (pop = gl.gl_pathv; *pop && gargc < (MAXGLOBARGS-1); 110 pop++) 111 gargv[gargc++] = strdup(*pop); 112 globfree(&gl); 113 } 114 gargv[gargc] = NULL; 115 116 iop = NULL; 117 #ifdef INTERNAL_LS 118 fflush(NULL); 119 pid = (strcmp(gargv[0], _PATH_LS) == 0) ? fork() : vfork(); 120 #else 121 pid = vfork(); 122 #endif 123 switch(pid) { 124 case -1: /* error */ 125 (void)close(pdes[0]); 126 (void)close(pdes[1]); 127 goto pfree; 128 /* NOTREACHED */ 129 case 0: /* child */ 130 if (*type == 'r') { 131 if (pdes[1] != STDOUT_FILENO) { 132 dup2(pdes[1], STDOUT_FILENO); 133 (void)close(pdes[1]); 134 } 135 dup2(STDOUT_FILENO, STDERR_FILENO); /* stderr too! */ 136 (void)close(pdes[0]); 137 } else { 138 if (pdes[0] != STDIN_FILENO) { 139 dup2(pdes[0], STDIN_FILENO); 140 (void)close(pdes[0]); 141 } 142 (void)close(pdes[1]); 143 } 144 #ifdef INTERNAL_LS 145 if (strcmp(gargv[0], _PATH_LS) == 0) { 146 extern int optreset; 147 /* Reset getopt for ls_main() */ 148 optreset = optind = optopt = 1; 149 exit(ls_main(gargc, gargv)); 150 } 151 #endif 152 execv(gargv[0], gargv); 153 _exit(1); 154 } 155 /* parent; assume fdopen can't fail... */ 156 if (*type == 'r') { 157 iop = fdopen(pdes[0], type); 158 (void)close(pdes[1]); 159 } else { 160 iop = fdopen(pdes[1], type); 161 (void)close(pdes[0]); 162 } 163 pids[fileno(iop)] = pid; 164 165 pfree: for (argc = 1; gargv[argc] != NULL; argc++) 166 free(gargv[argc]); 167 168 return (iop); 169 } 170 171 int 172 ftpd_pclose(iop) 173 FILE *iop; 174 { 175 int fdes, omask, status; 176 pid_t pid; 177 178 /* 179 * pclose returns -1 if stream is not associated with a 180 * `popened' command, or, if already `pclosed'. 181 */ 182 if (pids == 0 || pids[fdes = fileno(iop)] == 0) 183 return (-1); 184 (void)fclose(iop); 185 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP)); 186 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR) 187 continue; 188 (void)sigsetmask(omask); 189 pids[fdes] = 0; 190 if (pid < 0) 191 return (pid); 192 if (WIFEXITED(status)) 193 return (WEXITSTATUS(status)); 194 return (1); 195 } 196