1 /* $OpenBSD: popen.c,v 1.30 2020/12/27 15:11:04 florian 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 char *cp; 65 FILE *iop; 66 int argc = 0, pdes[2]; 67 pid_t pid; 68 char **pop, *argv[_POSIX_ARG_MAX]; 69 70 if (pipe(pdes) == -1) 71 return (NULL); 72 73 /* break up string into pieces */ 74 argv[argc++] = "/bin/ls"; 75 argv[argc++] = "-lgA"; 76 argv[argc++] = "--"; 77 78 /* glob that path */ 79 if (path != NULL) { 80 glob_t gl; 81 82 memset(&gl, 0, sizeof(gl)); 83 if (glob(path, 84 GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT, 85 NULL, &gl)) { 86 fatal ("Glob error."); 87 } else if (gl.gl_pathc > 0) { 88 for (pop = gl.gl_pathv; *pop && argc < _POSIX_ARG_MAX-1; 89 pop++) { 90 argv[argc++] = strdup(*pop); 91 if (argv[argc - 1] == NULL) 92 fatal ("Out of memory."); 93 } 94 } 95 globfree(&gl); 96 } 97 argv[argc] = NULL; 98 99 iop = NULL; 100 101 switch (pid = fork()) { 102 case -1: /* error */ 103 (void)close(pdes[0]); 104 (void)close(pdes[1]); 105 goto pfree; 106 /* NOTREACHED */ 107 case 0: /* child */ 108 if (pdes[1] != STDOUT_FILENO) { 109 dup2(pdes[1], STDOUT_FILENO); 110 (void)close(pdes[1]); 111 } 112 dup2(STDOUT_FILENO, STDERR_FILENO); /* stderr too! */ 113 (void)close(pdes[0]); 114 closelog(); 115 116 extern int ls_main(int, char **); 117 118 /* reset getopt for ls_main */ 119 optreset = optind = 1; 120 exit(ls_main(argc, argv)); 121 } 122 /* parent; assume fdopen can't fail... */ 123 iop = fdopen(pdes[0], "r"); 124 (void)close(pdes[1]); 125 *pidptr = pid; 126 127 pfree: 128 for (argc = 3; argv[argc] != NULL; argc++) 129 free(argv[argc]); 130 131 return (iop); 132 } 133 134 int 135 ftpd_pclose(FILE *iop, pid_t pid) 136 { 137 int status; 138 pid_t rv; 139 sigset_t sigset, osigset; 140 141 (void)fclose(iop); 142 sigemptyset(&sigset); 143 sigaddset(&sigset, SIGINT); 144 sigaddset(&sigset, SIGQUIT); 145 sigaddset(&sigset, SIGHUP); 146 sigprocmask(SIG_BLOCK, &sigset, &osigset); 147 while ((rv = waitpid(pid, &status, 0)) == -1 && errno == EINTR) 148 continue; 149 sigprocmask(SIG_SETMASK, &osigset, NULL); 150 if (rv == -1) 151 return (-1); 152 if (WIFEXITED(status)) 153 return (WEXITSTATUS(status)); 154 return (1); 155 } 156