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 * $Id$ 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 58 /* 59 * Special version of popen which avoids call to shell. This ensures noone 60 * may create a pipe to a hidden program as a side effect of a list or dir 61 * command. 62 */ 63 static int *pids; 64 static int fds; 65 66 FILE * 67 ftpd_popen(program, type) 68 char *program, *type; 69 { 70 char *cp; 71 FILE *iop; 72 int argc, gargc, pdes[2], pid; 73 char **pop, *argv[100], *gargv[1000]; 74 75 if (((*type != 'r') && (*type != 'w')) || type[1]) 76 return (NULL); 77 78 if (!pids) { 79 if ((fds = getdtablesize()) <= 0) 80 return (NULL); 81 if ((pids = (int *)malloc((u_int)(fds * sizeof(int)))) == NULL) 82 return (NULL); 83 memset(pids, 0, fds * sizeof(int)); 84 } 85 if (pipe(pdes) < 0) 86 return (NULL); 87 88 /* break up string into pieces */ 89 for (argc = 0, cp = program;; cp = NULL) 90 if (!(argv[argc++] = strtok(cp, " \t\n"))) 91 break; 92 93 /* glob each piece */ 94 gargv[0] = argv[0]; 95 for (gargc = argc = 1; argv[argc]; argc++) { 96 glob_t gl; 97 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 98 99 memset(&gl, 0, sizeof(gl)); 100 if (glob(argv[argc], flags, NULL, &gl)) 101 gargv[gargc++] = strdup(argv[argc]); 102 else 103 for (pop = gl.gl_pathv; *pop; pop++) 104 gargv[gargc++] = strdup(*pop); 105 globfree(&gl); 106 } 107 gargv[gargc] = NULL; 108 109 iop = NULL; 110 switch(pid = vfork()) { 111 case -1: /* error */ 112 (void)close(pdes[0]); 113 (void)close(pdes[1]); 114 goto pfree; 115 /* NOTREACHED */ 116 case 0: /* child */ 117 if (*type == 'r') { 118 if (pdes[1] != STDOUT_FILENO) { 119 dup2(pdes[1], STDOUT_FILENO); 120 (void)close(pdes[1]); 121 } 122 dup2(STDOUT_FILENO, STDERR_FILENO); /* stderr too! */ 123 (void)close(pdes[0]); 124 } else { 125 if (pdes[0] != STDIN_FILENO) { 126 dup2(pdes[0], STDIN_FILENO); 127 (void)close(pdes[0]); 128 } 129 (void)close(pdes[1]); 130 } 131 execv(gargv[0], gargv); 132 _exit(1); 133 } 134 /* parent; assume fdopen can't fail... */ 135 if (*type == 'r') { 136 iop = fdopen(pdes[0], type); 137 (void)close(pdes[1]); 138 } else { 139 iop = fdopen(pdes[1], type); 140 (void)close(pdes[0]); 141 } 142 pids[fileno(iop)] = pid; 143 144 pfree: for (argc = 1; gargv[argc] != NULL; argc++) 145 free(gargv[argc]); 146 147 return (iop); 148 } 149 150 int 151 ftpd_pclose(iop) 152 FILE *iop; 153 { 154 int fdes, omask, status; 155 pid_t pid; 156 157 /* 158 * pclose returns -1 if stream is not associated with a 159 * `popened' command, or, if already `pclosed'. 160 */ 161 if (pids == 0 || pids[fdes = fileno(iop)] == 0) 162 return (-1); 163 (void)fclose(iop); 164 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP)); 165 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR) 166 continue; 167 (void)sigsetmask(omask); 168 pids[fdes] = 0; 169 if (pid < 0) 170 return (pid); 171 if (WIFEXITED(status)) 172 return (WEXITSTATUS(status)); 173 return (1); 174 } 175