1 /* $OpenBSD: popen.c,v 1.31 2023/02/17 17:59:36 miod 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 <limits.h> 43 #include <signal.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <syslog.h> 48 #include <unistd.h> 49 50 #include <netinet/in.h> 51 52 #include "monitor.h" 53 #include "extern.h" 54 55 /* 56 * Special version of popen which avoids call to shell. This ensures no one 57 * may create a pipe to a hidden program as a side effect of a list or dir 58 * command. 59 */ 60 61 FILE * 62 ftpd_ls(const char *path, pid_t *pidptr) 63 { 64 FILE *iop; 65 int argc = 0, pdes[2]; 66 pid_t pid; 67 char **pop, *argv[_POSIX_ARG_MAX]; 68 69 if (pipe(pdes) == -1) 70 return (NULL); 71 72 /* break up string into pieces */ 73 argv[argc++] = "/bin/ls"; 74 argv[argc++] = "-lgA"; 75 argv[argc++] = "--"; 76 77 /* glob that path */ 78 if (path != NULL) { 79 glob_t gl; 80 81 memset(&gl, 0, sizeof(gl)); 82 if (glob(path, 83 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT, 84 NULL, &gl)) { 85 fatal ("Glob error."); 86 } else if (gl.gl_pathc > 0) { 87 for (pop = gl.gl_pathv; *pop && argc < _POSIX_ARG_MAX-1; 88 pop++) { 89 argv[argc++] = strdup(*pop); 90 if (argv[argc - 1] == NULL) 91 fatal ("Out of memory."); 92 } 93 } 94 globfree(&gl); 95 } 96 argv[argc] = NULL; 97 98 iop = NULL; 99 100 switch (pid = fork()) { 101 case -1: /* error */ 102 (void)close(pdes[0]); 103 (void)close(pdes[1]); 104 goto pfree; 105 /* NOTREACHED */ 106 case 0: /* child */ 107 if (pdes[1] != STDOUT_FILENO) { 108 dup2(pdes[1], STDOUT_FILENO); 109 (void)close(pdes[1]); 110 } 111 dup2(STDOUT_FILENO, STDERR_FILENO); /* stderr too! */ 112 (void)close(pdes[0]); 113 closelog(); 114 115 extern int ls_main(int, char **); 116 117 /* reset getopt for ls_main */ 118 optreset = optind = 1; 119 exit(ls_main(argc, argv)); 120 } 121 /* parent; assume fdopen can't fail... */ 122 iop = fdopen(pdes[0], "r"); 123 (void)close(pdes[1]); 124 *pidptr = pid; 125 126 pfree: 127 for (argc = 3; argv[argc] != NULL; argc++) 128 free(argv[argc]); 129 130 return (iop); 131 } 132 133 int 134 ftpd_pclose(FILE *iop, pid_t pid) 135 { 136 int status; 137 pid_t rv; 138 sigset_t sigset, osigset; 139 140 (void)fclose(iop); 141 sigemptyset(&sigset); 142 sigaddset(&sigset, SIGINT); 143 sigaddset(&sigset, SIGQUIT); 144 sigaddset(&sigset, SIGHUP); 145 sigprocmask(SIG_BLOCK, &sigset, &osigset); 146 while ((rv = waitpid(pid, &status, 0)) == -1 && errno == EINTR) 147 continue; 148 sigprocmask(SIG_SETMASK, &osigset, NULL); 149 if (rv == -1) 150 return (-1); 151 if (WIFEXITED(status)) 152 return (WEXITSTATUS(status)); 153 return (1); 154 } 155