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 */ 37 38 #ifdef HAVE_CONFIG_H 39 #include <config.h> 40 RCSID("$Id: popen.c,v 1.19 1999/09/16 20:38:45 assar Exp $"); 41 #endif 42 43 #include <sys/types.h> 44 #ifdef TIME_WITH_SYS_TIME 45 #include <sys/time.h> 46 #include <time.h> 47 #elif defined(HAVE_SYS_TIME_H) 48 #include <sys/time.h> 49 #else 50 #include <time.h> 51 #endif 52 #ifdef HAVE_SYS_RESOURCE_H 53 #include <sys/resource.h> 54 #endif 55 #include <sys/wait.h> 56 57 #include <errno.h> 58 #include <glob.h> 59 #include <signal.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <unistd.h> 64 65 #include "extern.h" 66 67 #include <roken.h> 68 69 /* 70 * Special version of popen which avoids call to shell. This ensures 71 * no one may create a pipe to a hidden program as a side effect of a 72 * list or dir command. 73 */ 74 static int *pids; 75 static int fds; 76 77 extern int dochroot; 78 79 /* return path prepended with ~ftp if that file exists, otherwise 80 * return path unchanged 81 */ 82 83 const char * 84 ftp_rooted(const char *path) 85 { 86 static char home[MaxPathLen] = ""; 87 static char newpath[MaxPathLen]; 88 struct passwd *pwd; 89 90 if(!home[0]) 91 if((pwd = k_getpwnam("ftp"))) 92 strlcpy(home, pwd->pw_dir, sizeof(home)); 93 snprintf(newpath, sizeof(newpath), "%s/%s", home, path); 94 if(access(newpath, X_OK)) 95 strlcpy(newpath, path, sizeof(newpath)); 96 return newpath; 97 } 98 99 100 FILE * 101 ftpd_popen(char *program, char *type, int do_stderr, int no_glob) 102 { 103 char *cp; 104 FILE *iop; 105 int argc, gargc, pdes[2], pid; 106 char **pop, *argv[100], *gargv[1000]; 107 char *foo; 108 109 if (strcmp(type, "r") && strcmp(type, "w")) 110 return (NULL); 111 112 if (!pids) { 113 114 /* This function is ugly and should be rewritten, in 115 * modern unices there is no such thing as a maximum 116 * filedescriptor. 117 */ 118 119 fds = getdtablesize(); 120 pids = (int*)calloc(fds, sizeof(int)); 121 if(!pids) 122 return NULL; 123 } 124 if (pipe(pdes) < 0) 125 return (NULL); 126 127 /* break up string into pieces */ 128 foo = NULL; 129 for (argc = 0, cp = program;; cp = NULL) { 130 if (!(argv[argc++] = strtok_r(cp, " \t\n", &foo))) 131 break; 132 } 133 134 gargv[0] = (char*)ftp_rooted(argv[0]); 135 /* glob each piece */ 136 for (gargc = argc = 1; argv[argc]; argc++) { 137 glob_t gl; 138 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; 139 140 memset(&gl, 0, sizeof(gl)); 141 if (no_glob || glob(argv[argc], flags, NULL, &gl)) 142 gargv[gargc++] = strdup(argv[argc]); 143 else 144 for (pop = gl.gl_pathv; *pop; pop++) 145 gargv[gargc++] = strdup(*pop); 146 globfree(&gl); 147 } 148 gargv[gargc] = NULL; 149 150 iop = NULL; 151 switch(pid = fork()) { 152 case -1: /* error */ 153 close(pdes[0]); 154 close(pdes[1]); 155 goto pfree; 156 /* NOTREACHED */ 157 case 0: /* child */ 158 if (*type == 'r') { 159 if (pdes[1] != STDOUT_FILENO) { 160 dup2(pdes[1], STDOUT_FILENO); 161 close(pdes[1]); 162 } 163 if(do_stderr) 164 dup2(STDOUT_FILENO, STDERR_FILENO); 165 close(pdes[0]); 166 } else { 167 if (pdes[0] != STDIN_FILENO) { 168 dup2(pdes[0], STDIN_FILENO); 169 close(pdes[0]); 170 } 171 close(pdes[1]); 172 } 173 execv(gargv[0], gargv); 174 gargv[0] = argv[0]; 175 execv(gargv[0], gargv); 176 _exit(1); 177 } 178 /* parent; assume fdopen can't fail... */ 179 if (*type == 'r') { 180 iop = fdopen(pdes[0], type); 181 close(pdes[1]); 182 } else { 183 iop = fdopen(pdes[1], type); 184 close(pdes[0]); 185 } 186 pids[fileno(iop)] = pid; 187 188 pfree: 189 for (argc = 1; gargv[argc] != NULL; argc++) 190 free(gargv[argc]); 191 192 193 return (iop); 194 } 195 196 int 197 ftpd_pclose(FILE *iop) 198 { 199 int fdes, status; 200 pid_t pid; 201 sigset_t sigset, osigset; 202 203 /* 204 * pclose returns -1 if stream is not associated with a 205 * `popened' command, or, if already `pclosed'. 206 */ 207 if (pids == 0 || pids[fdes = fileno(iop)] == 0) 208 return (-1); 209 fclose(iop); 210 sigemptyset(&sigset); 211 sigaddset(&sigset, SIGINT); 212 sigaddset(&sigset, SIGQUIT); 213 sigaddset(&sigset, SIGHUP); 214 sigprocmask(SIG_BLOCK, &sigset, &osigset); 215 while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR) 216 continue; 217 sigprocmask(SIG_SETMASK, &osigset, NULL); 218 pids[fdes] = 0; 219 if (pid < 0) 220 return (pid); 221 if (WIFEXITED(status)) 222 return (WEXITSTATUS(status)); 223 return (1); 224 } 225