/* $NetBSD: popen.c,v 1.38 2016/03/17 00:17:58 christos Exp $ */ /*- * Copyright (c) 1999-2009 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Luke Mewburn. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* * 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. * */ #include <sys/cdefs.h> #ifndef lint #if 0 static char sccsid[] = "@(#)popen.c 8.3 (Berkeley) 4/6/94"; #else __RCSID("$NetBSD: popen.c,v 1.38 2016/03/17 00:17:58 christos Exp $"); #endif #endif /* not lint */ #include <sys/types.h> #include <sys/param.h> #include <sys/wait.h> #include <errno.h> #include <glob.h> #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stringlist.h> #include <syslog.h> #include <unistd.h> #ifdef KERBEROS5 #include <krb5/krb5.h> #endif #include "extern.h" #define INCR 100 /* * Special version of popen which avoids call to shell. This ensures no-one * may create a pipe to a hidden program as a side effect of a list or dir * command. * If stderrfd != -1, then send stderr of a read command there, * otherwise close stderr. */ static int *pids; static int fds; extern int ls_main(int, char *[]); FILE * ftpd_popen(const char *argv[], const char *ptype, int stderrfd) { FILE * volatile iop; int argc, pdes[2], pid; volatile int isls; char **pop; StringList *sl; iop = NULL; isls = 0; if ((*ptype != 'r' && *ptype != 'w') || ptype[1]) return (NULL); if (!pids) { if ((fds = getdtablesize()) <= 0) return (NULL); if ((pids = (int *)malloc((unsigned int)(fds * sizeof(int)))) == NULL) return (NULL); memset(pids, 0, fds * sizeof(int)); } if (pipe(pdes) < 0) return (NULL); if ((sl = sl_init()) == NULL) goto pfree; /* glob each piece */ if (sl_add(sl, ftpd_strdup(argv[0])) == -1) goto pfree; for (argc = 1; argv[argc]; argc++) { glob_t gl; int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT; memset(&gl, 0, sizeof(gl)); if (glob(argv[argc], flags, NULL, &gl) || gl.gl_pathv == NULL) { if (sl_add(sl, ftpd_strdup(argv[argc])) == -1) { globfree(&gl); goto pfree; } } else { for (pop = gl.gl_pathv; *pop; pop++) { if (sl_add(sl, ftpd_strdup(*pop)) == -1) { globfree(&gl); goto pfree; } } } globfree(&gl); } if (sl_add(sl, NULL) == -1) goto pfree; #ifndef NO_INTERNAL_LS isls = (strcmp(sl->sl_str[0], INTERNAL_LS) == 0); #endif pid = isls ? fork() : vfork(); switch (pid) { case -1: /* error */ (void)close(pdes[0]); (void)close(pdes[1]); goto pfree; /* NOTREACHED */ case 0: /* child */ if (*ptype == 'r') { if (pdes[1] != STDOUT_FILENO) { dup2(pdes[1], STDOUT_FILENO); (void)close(pdes[1]); } if (stderrfd == -1) (void)close(STDERR_FILENO); else dup2(stderrfd, STDERR_FILENO); (void)close(pdes[0]); } else { if (pdes[0] != STDIN_FILENO) { dup2(pdes[0], STDIN_FILENO); (void)close(pdes[0]); } (void)close(pdes[1]); } #ifndef NO_INTERNAL_LS if (isls) { /* use internal ls */ optreset = optind = optopt = 1; closelog(); exit(ls_main(sl->sl_cur - 1, sl->sl_str)); } #endif execv(sl->sl_str[0], sl->sl_str); _exit(1); } /* parent; assume fdopen can't fail... */ if (*ptype == 'r') { iop = fdopen(pdes[0], ptype); (void)close(pdes[1]); } else { iop = fdopen(pdes[1], ptype); (void)close(pdes[0]); } pids[fileno(iop)] = pid; pfree: if (sl) sl_free(sl, 1); return (iop); } int ftpd_pclose(FILE *iop) { int fdes, status; pid_t pid; sigset_t nsigset, 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(&nsigset); sigaddset(&nsigset, SIGINT); sigaddset(&nsigset, SIGQUIT); sigaddset(&nsigset, SIGHUP); sigprocmask(SIG_BLOCK, &nsigset, &osigset); while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR) continue; sigprocmask(SIG_SETMASK, &osigset, NULL); pids[fdes] = 0; if (pid < 0) return (pid); if (WIFEXITED(status)) return (WEXITSTATUS(status)); return (1); }
