/* $OpenBSD: popen.c,v 1.22 2008/06/30 12:03:51 ragge Exp $ */ /* $NetBSD: popen.c,v 1.5 1995/04/11 02:45:00 cgd Exp $ */ /* * Copyright (c) 1988, 1993, 1994 * The Regents of the University of California. All rights reserved. * * This code is derived from software written by Ken Arnold and * published in UNIX Review, Vol. 6, No. 8. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * */ #ifndef lint #if 0 static const char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 4/6/94"; #else static const char rcsid[] = "$OpenBSD: popen.c,v 1.22 2008/06/30 12:03:51 ragge Exp $"; #endif #endif /* not lint */ #include <sys/types.h> #include <sys/wait.h> #include <errno.h> #include <glob.h> #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <syslog.h> #include <unistd.h> #include <netinet/in.h> #include "monitor.h" #include "extern.h" /* * Special version of popen which avoids call to shell. This ensures noone * may create a pipe to a hidden program as a side effect of a list or dir * command. */ static pid_t *pids; static int fds; #define MAX_ARGV 100 #define MAX_GARGV 1000 FILE * ftpd_popen(char *program, char *type) { char *cp; FILE *iop; int argc, gargc, pdes[2]; pid_t pid; char **pop, *argv[MAX_ARGV], *gargv[MAX_GARGV]; if ((*type != 'r' && *type != 'w') || type[1]) return (NULL); if (!pids) { if ((fds = getdtablesize()) <= 0) return (NULL); if ((pids = calloc(fds, sizeof(pid_t))) == NULL) return (NULL); } if (pipe(pdes) < 0) return (NULL); /* break up string into pieces */ for (argc = 0, cp = program;argc < MAX_ARGV-1; cp = NULL) if (!(argv[argc++] = strtok(cp, " \t\n"))) break; argv[MAX_ARGV-1] = NULL; /* glob each piece */ gargv[0] = argv[0]; for (gargc = argc = 1; argv[argc]; argc++) { glob_t gl; memset(&gl, 0, sizeof(gl)); if (glob(argv[argc], GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT, NULL, &gl)) { if (gargc < MAX_GARGV-1) { gargv[gargc++] = strdup(argv[argc]); if (gargv[gargc -1] == NULL) fatal ("Out of memory."); } } else for (pop = gl.gl_pathv; *pop && gargc < MAX_GARGV-1; pop++) { gargv[gargc++] = strdup(*pop); if (gargv[gargc - 1] == NULL) fatal ("Out of memory."); } globfree(&gl); } gargv[gargc] = NULL; iop = NULL; switch (pid = fork()) { case -1: /* error */ (void)close(pdes[0]); (void)close(pdes[1]); goto pfree; /* NOTREACHED */ case 0: /* child */ if (*type == 'r') { if (pdes[1] != STDOUT_FILENO) { dup2(pdes[1], STDOUT_FILENO); (void)close(pdes[1]); } dup2(STDOUT_FILENO, STDERR_FILENO); /* stderr too! */ (void)close(pdes[0]); } else { if (pdes[0] != STDIN_FILENO) { dup2(pdes[0], STDIN_FILENO); (void)close(pdes[0]); } (void)close(pdes[1]); } closelog(); if (strcmp(gargv[0], "/bin/ls") == 0) { extern int optreset; extern int ls_main(int, char **); /* reset getopt for ls_main */ optreset = optind = 1; exit(ls_main(gargc, gargv)); } execv(gargv[0], gargv); _exit(1); } /* parent; assume fdopen can't fail... */ if (*type == 'r') { iop = fdopen(pdes[0], type); (void)close(pdes[1]); } else { iop = fdopen(pdes[1], type); (void)close(pdes[0]); } pids[fileno(iop)] = pid; pfree: for (argc = 1; gargv[argc] != NULL; argc++) free(gargv[argc]); return (iop); } int ftpd_pclose(FILE *iop) { int fdes, status; pid_t pid; sigset_t sigset, osigset; /* * pclose returns -1 if stream is not associated with a * `popened' command, or, if already `pclosed'. */ if (pids == 0 || pids[fdes = fileno(iop)] == 0) return (-1); (void)fclose(iop); sigemptyset(&sigset); sigaddset(&sigset, SIGINT); sigaddset(&sigset, SIGQUIT); sigaddset(&sigset, SIGHUP); sigprocmask(SIG_BLOCK, &sigset, &osigset); while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR) continue; sigprocmask(SIG_SETMASK, &osigset, NULL); pids[fdes] = 0; if (pid < 0) return (-1); if (WIFEXITED(status)) return (WEXITSTATUS(status)); return (1); }