diff options
Diffstat (limited to 'contrib/lukemftpd/src/popen.c')
| -rw-r--r-- | contrib/lukemftpd/src/popen.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/contrib/lukemftpd/src/popen.c b/contrib/lukemftpd/src/popen.c new file mode 100644 index 0000000..7e8d036 --- /dev/null +++ b/contrib/lukemftpd/src/popen.c @@ -0,0 +1,236 @@ +/* $NetBSD: popen.c,v 1.26 2001/04/25 01:46:26 lukem Exp $ */ + +/*- + * Copyright (c) 1999-2001 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the NetBSD + * Foundation, Inc. and its contributors. + * 4. Neither the name of The NetBSD Foundation 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 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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 "lukemftpd.h" + +#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(char *argv[], const char *type, int stderrfd) +{ + FILE *iop; + int argc, pdes[2], pid, isls; + char **pop; + StringList *sl; + + iop = NULL; + isls = 0; + if ((*type != 'r' && *type != 'w') || type[1]) + return (NULL); + + if (!pids) { + if ((fds = getdtablesize()) <= 0) + return (NULL); + if ((pids = (int *)malloc((u_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, xstrdup(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)) { + if (sl_add(sl, xstrdup(argv[argc])) == -1) { + globfree(&gl); + goto pfree; + } + } else { + for (pop = gl.gl_pathv; *pop; pop++) { + if (sl_add(sl, xstrdup(*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 + +#if HAVE_VFORK + pid = isls ? fork() : vfork(); +#else + pid = fork(); +#endif + switch (pid) { + 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]); + } + 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 */ +#if HAVE_OPTRESET + optreset = 1; +#endif + 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 (*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: + if (sl) + sl_free(sl, 1); + 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 (pid); + if (WIFEXITED(status)) + return (WEXITSTATUS(status)); + return (1); +} |
