1 /* $OpenBSD: popen.c,v 1.26 2016/02/29 17:50:34 jca Exp $ */ 2 /* $NetBSD: popen.c,v 1.5 1995/04/11 02:45:00 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1988, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software written by Ken Arnold and 9 * published in UNIX Review, Vol. 6, No. 8. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 */ 36 37 #include <sys/types.h> 38 #include <sys/wait.h> 39 40 #include <errno.h> 41 #include <glob.h> 42 #include <signal.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <syslog.h> 47 #include <unistd.h> 48 49 #include <netinet/in.h> 50 51 #include "monitor.h" 52 #include "extern.h" 53 54 /* 55 * Special version of popen which avoids call to shell. This ensures noone 56 * may create a pipe to a hidden program as a side effect of a list or dir 57 * command. 58 */ 59 #define MAX_ARGV 100 60 #define MAX_GARGV 1000 61 62 FILE * 63 ftpd_popen(char *program, char *type, pid_t *pidptr) 64 { 65 char *cp; 66 FILE *iop; 67 int argc, gargc, pdes[2]; 68 pid_t pid; 69 char **pop, *argv[MAX_ARGV], *gargv[MAX_GARGV]; 70 71 if ((*type != 'r' && *type != 'w') || type[1]) 72 return (NULL); 73 74 if (pipe(pdes) < 0) 75 return (NULL); 76 77 /* break up string into pieces */ 78 for (argc = 0, cp = program;argc < MAX_ARGV-1; cp = NULL) 79 if (!(argv[argc++] = strtok(cp, " \t\n"))) 80 break; 81 argv[MAX_ARGV-1] = NULL; 82 83 /* glob each piece */ 84 gargv[0] = argv[0]; 85 for (gargc = argc = 1; argv[argc]; argc++) { 86 glob_t gl; 87 88 memset(&gl, 0, sizeof(gl)); 89 if (glob(argv[argc], 90 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT, 91 NULL, &gl)) { 92 if (gargc < MAX_GARGV-1) { 93 gargv[gargc++] = strdup(argv[argc]); 94 if (gargv[gargc -1] == NULL) 95 fatal ("Out of memory."); 96 } 97 98 } else if (gl.gl_pathc > 0) { 99 for (pop = gl.gl_pathv; *pop && gargc < MAX_GARGV-1; pop++) { 100 gargv[gargc++] = strdup(*pop); 101 if (gargv[gargc - 1] == NULL) 102 fatal ("Out of memory."); 103 } 104 } 105 globfree(&gl); 106 } 107 gargv[gargc] = NULL; 108 109 iop = NULL; 110 111 switch (pid = fork()) { 112 case -1: /* error */ 113 (void)close(pdes[0]); 114 (void)close(pdes[1]); 115 goto pfree; 116 /* NOTREACHED */ 117 case 0: /* child */ 118 if (*type == 'r') { 119 if (pdes[1] != STDOUT_FILENO) { 120 dup2(pdes[1], STDOUT_FILENO); 121 (void)close(pdes[1]); 122 } 123 dup2(STDOUT_FILENO, STDERR_FILENO); /* stderr too! */ 124 (void)close(pdes[0]); 125 } else { 126 if (pdes[0] != STDIN_FILENO) { 127 dup2(pdes[0], STDIN_FILENO); 128 (void)close(pdes[0]); 129 } 130 (void)close(pdes[1]); 131 } 132 closelog(); 133 134 if (strcmp(gargv[0], "/bin/ls") == 0) { 135 extern int optreset; 136 extern int ls_main(int, char **); 137 138 /* reset getopt for ls_main */ 139 optreset = optind = 1; 140 exit(ls_main(gargc, gargv)); 141 } 142 143 execv(gargv[0], gargv); 144 _exit(1); 145 } 146 /* parent; assume fdopen can't fail... */ 147 if (*type == 'r') { 148 iop = fdopen(pdes[0], type); 149 (void)close(pdes[1]); 150 } else { 151 iop = fdopen(pdes[1], type); 152 (void)close(pdes[0]); 153 } 154 *pidptr = pid; 155 156 pfree: for (argc = 1; gargv[argc] != NULL; argc++) 157 free(gargv[argc]); 158 159 return (iop); 160 } 161 162 int 163 ftpd_pclose(FILE *iop, pid_t pid) 164 { 165 int status; 166 pid_t rv; 167 sigset_t sigset, osigset; 168 169 (void)fclose(iop); 170 sigemptyset(&sigset); 171 sigaddset(&sigset, SIGINT); 172 sigaddset(&sigset, SIGQUIT); 173 sigaddset(&sigset, SIGHUP); 174 sigprocmask(SIG_BLOCK, &sigset, &osigset); 175 while ((rv = waitpid(pid, &status, 0)) < 0 && errno == EINTR) 176 continue; 177 sigprocmask(SIG_SETMASK, &osigset, NULL); 178 if (rv < 0) 179 return (-1); 180 if (WIFEXITED(status)) 181 return (WEXITSTATUS(status)); 182 return (1); 183 } 184