496 lines
10 KiB
C
Executable File
496 lines
10 KiB
C
Executable File
/*
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* Heirloom mailx - a mail user agent derived from Berkeley Mail.
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*
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* Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
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*/
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/*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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#ifdef DOSCCS
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static char sccsid[] = "@(#)popen.c 2.20 (gritter) 3/4/06";
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#endif
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#endif /* not lint */
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#include "rcv.h"
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#include "extern.h"
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include "mail.h"
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#ifndef NSIG
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#define NSIG 32
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#endif
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#define READ 0
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#define WRITE 1
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struct fp {
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FILE *fp;
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struct fp *link;
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char *realfile;
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long offset;
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int omode;
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int pipe;
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int pid;
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enum {
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FP_UNCOMPRESSED = 00,
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FP_GZIPPED = 01,
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FP_BZIP2ED = 02,
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FP_IMAP = 03,
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FP_MAILDIR = 04,
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FP_MASK = 0177,
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FP_READONLY = 0200
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} compressed;
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};
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static struct fp *fp_head;
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struct child {
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int pid;
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char done;
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char free;
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int status;
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struct child *link;
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};
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static struct child *child;
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static int scan_mode(const char *mode, int *omode);
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static void register_file(FILE *fp, int omode);
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static enum okay compress(struct fp *fpp);
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static enum okay unregister_file(FILE *fp);
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static int file_pid(FILE *fp);
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static int wait_command(int pid);
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static struct child *findchild(int pid);
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static void delchild(struct child *cp);
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/*
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* Provide BSD-like signal() on all systems.
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*/
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sighandler_type
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safe_signal(int signum, sighandler_type handler)
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{
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struct sigaction nact, oact;
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nact.sa_handler = handler;
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sigemptyset(&nact.sa_mask);
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nact.sa_flags = 0;
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#ifdef SA_RESTART
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nact.sa_flags |= SA_RESTART;
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#endif
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if (sigaction(signum, &nact, &oact) != 0)
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return SIG_ERR;
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return oact.sa_handler;
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}
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static int
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scan_mode(const char *mode, int *omode)
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{
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if (!strcmp(mode, "r")) {
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*omode = O_RDONLY;
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} else if (!strcmp(mode, "w")) {
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*omode = O_WRONLY | O_CREAT | O_TRUNC;
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} else if (!strcmp(mode, "wx")) {
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*omode = O_WRONLY | O_CREAT | O_EXCL;
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} else if (!strcmp(mode, "a")) {
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*omode = O_WRONLY | O_APPEND | O_CREAT;
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} else if (!strcmp(mode, "a+")) {
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*omode = O_RDWR | O_APPEND;
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} else if (!strcmp(mode, "r+")) {
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*omode = O_RDWR;
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} else if (!strcmp(mode, "w+")) {
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*omode = O_RDWR | O_CREAT | O_EXCL;
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} else {
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DEBUG_ERROR( catgets(catd, CATSET, 152,
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"Internal error: bad stdio open mode %s\n"), mode);
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errno = EINVAL;
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return -1;
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}
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return 0;
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}
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FILE *
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safe_fopen(const char *file, const char *mode, int *omode)
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{
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int fd;
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if (scan_mode(mode, omode) < 0)
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return NULL;
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if ((fd = open(file, *omode, 0666)) < 0)
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return NULL;
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return fdopen(fd, mode);
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}
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FILE *
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Fopen(const char *file, const char *mode)
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{
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FILE *fp;
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int omode;
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if ((fp = safe_fopen(file, mode, &omode)) != NULL) {
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register_file(fp, omode);
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fcntl(fileno(fp), F_SETFD, FD_CLOEXEC);
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}
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return fp;
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}
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FILE *
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Fdopen(int fd, const char *mode)
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{
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FILE *fp;
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int omode;
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scan_mode(mode, &omode);
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if ((fp = fdopen(fd, mode)) != NULL) {
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register_file(fp, omode);
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fcntl(fileno(fp), F_SETFD, FD_CLOEXEC);
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}
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return fp;
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}
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int
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Fclose(FILE *fp)
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{
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int i = 0;
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if (unregister_file(fp) == OKAY)
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i |= 1;
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if (fclose(fp) == 0)
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i |= 2;
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return i == 3 ? 0 : EOF;
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}
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int
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Pclose(FILE *ptr)
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{
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int i;
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sigset_t nset, oset;
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i = file_pid(ptr);
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if (i < 0)
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return 0;
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unregister_file(ptr);
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fclose(ptr);
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sigemptyset(&nset);
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sigaddset(&nset, SIGINT);
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sigaddset(&nset, SIGHUP);
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sigprocmask(SIG_BLOCK, &nset, &oset);
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i = wait_child(i);
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sigprocmask(SIG_SETMASK, &oset, (sigset_t *)NULL);
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return i;
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}
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void
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close_all_files(void)
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{
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while (fp_head)
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if (fp_head->pipe)
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Pclose(fp_head->fp);
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else
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Fclose(fp_head->fp);
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}
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static void
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register_file(FILE *fp, int omode)
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{
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struct fp *fpp;
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fpp = (struct fp*)smalloc(sizeof *fpp);
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fpp->fp = fp;
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fpp->omode = omode;
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fpp->pipe = 0;
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fpp->pid = 0;
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fpp->link = fp_head;
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fpp->compressed = FP_UNCOMPRESSED;
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fpp->realfile = NULL;
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fpp->offset = 0L;
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fp_head = fpp;
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}
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static enum okay
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compress(struct fp *fpp)
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{
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int output;
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char *command[2];
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enum okay ok;
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if (fpp->omode == O_RDONLY)
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return OKAY;
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fflush(fpp->fp);
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clearerr(fpp->fp);
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fseek(fpp->fp, fpp->offset, SEEK_SET);
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if ((fpp->compressed&FP_MASK) == FP_IMAP) {
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return STOP;
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}
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if ((fpp->compressed&FP_MASK) == FP_MAILDIR) {
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return maildir_append(fpp->realfile, fpp->fp);
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}
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if ((output = open(fpp->realfile,
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(fpp->omode|O_CREAT)&~O_EXCL,
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0666)) < 0) {
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DEBUG_ERROR("Fatal: cannot create ");
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perror(fpp->realfile);
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return STOP;
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}
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if ((fpp->omode & O_APPEND) == 0)
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ftruncate(output, 0);
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switch (fpp->compressed & FP_MASK) {
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case FP_GZIPPED:
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command[0] = "gzip"; command[1] = "-c"; break;
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case FP_BZIP2ED:
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command[0] = "bzip2"; command[1] = "-c"; break;
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default:
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command[0] = "cat"; command[1] = NULL; break;
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}
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if (run_command(command[0], 0, fileno(fpp->fp), output,
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command[1], NULL, NULL) < 0)
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ok = STOP;
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else
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ok = OKAY;
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close(output);
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return ok;
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}
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static enum okay
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unregister_file(FILE *fp)
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{
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struct fp **pp, *p;
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enum okay ok = OKAY;
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for (pp = &fp_head; (p = *pp) != (struct fp *)NULL; pp = &p->link)
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if (p->fp == fp) {
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if ((p->compressed&FP_MASK) != FP_UNCOMPRESSED)
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ok = compress(p);
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*pp = p->link;
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free(p);
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return ok;
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}
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panic(catgets(catd, CATSET, 153, "Invalid file pointer"));
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/*NOTREACHED*/
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return STOP;
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}
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static int
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file_pid(FILE *fp)
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{
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struct fp *p;
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for (p = fp_head; p; p = p->link)
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if (p->fp == fp)
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return (p->pid);
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return -1;
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}
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/*
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* Run a command without a shell, with optional arguments and splicing
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* of stdin and stdout. The command name can be a sequence of words.
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* Signals must be handled by the caller.
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* "Mask" contains the signals to ignore in the new process.
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* SIGINT is enabled unless it's in the mask.
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*/
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/*VARARGS4*/
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int
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run_command(char *cmd, sigset_t *mask, int infd, int outfd,
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char *a0, char *a1, char *a2)
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{
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int pid;
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if ((pid = start_command(cmd, mask, infd, outfd, a0, a1, a2)) < 0)
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return -1;
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return wait_command(pid);
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}
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/*VARARGS4*/
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int
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start_command(const char *cmd, sigset_t *mask, int infd, int outfd,
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const char *a0, const char *a1, const char *a2)
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{
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int pid;
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if ((pid = fork()) < 0) {
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perror("fork");
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return -1;
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}
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if (pid == 0) {
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char *argv[100];
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int i = getrawlist(cmd, strlen(cmd),
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argv, sizeof argv / sizeof *argv, 0);
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if ((argv[i++] = (char *)a0) != NULL &&
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(argv[i++] = (char *)a1) != NULL &&
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(argv[i++] = (char *)a2) != NULL)
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argv[i] = NULL;
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prepare_child(mask, infd, outfd);
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execvp(argv[0], argv);
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perror(argv[0]);
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mail_exit(MAIL_STATUS_ERR_GENERAL);
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}
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return pid;
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}
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void
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prepare_child(sigset_t *nset, int infd, int outfd)
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{
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int i;
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sigset_t fset;
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/*
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* All file descriptors other than 0, 1, and 2 are supposed to be
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* close-on-exec.
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*/
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if (infd >= 0)
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dup2(infd, 0);
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if (outfd >= 0)
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dup2(outfd, 1);
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if (nset) {
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for (i = 1; i < NSIG; i++)
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if (sigismember(nset, i))
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safe_signal(i, SIG_IGN);
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if (!sigismember(nset, SIGINT))
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safe_signal(SIGINT, SIG_DFL);
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}
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sigfillset(&fset);
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sigprocmask(SIG_UNBLOCK, &fset, (sigset_t *)NULL);
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}
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static int
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wait_command(int pid)
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{
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if (wait_child(pid) < 0 && (value("bsdcompat") || value("bsdmsgs"))) {
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DEBUG_PRINT(catgets(catd, CATSET, 154, "Fatal error in process.\n"));
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return -1;
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}
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return 0;
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}
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static struct child *
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findchild(int pid)
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{
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struct child **cpp;
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for (cpp = &child; *cpp != (struct child *)NULL && (*cpp)->pid != pid;
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cpp = &(*cpp)->link)
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;
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if (*cpp == (struct child *)NULL) {
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*cpp = (struct child *) smalloc(sizeof (struct child));
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(*cpp)->pid = pid;
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(*cpp)->done = (*cpp)->free = 0;
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(*cpp)->link = (struct child *)NULL;
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}
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return *cpp;
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}
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static void
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delchild(struct child *cp)
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{
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struct child **cpp;
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for (cpp = &child; *cpp != cp; cpp = &(*cpp)->link)
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;
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*cpp = cp->link;
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free(cp);
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}
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/*ARGSUSED*/
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void
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sigchild(int signo)
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{
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int pid;
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int status;
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struct child *cp;
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again:
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while ((pid = waitpid(-1, (int*)&status, WNOHANG)) > 0) {
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cp = findchild(pid);
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if (cp->free)
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delchild(cp);
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else {
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cp->done = 1;
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cp->status = status;
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}
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}
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if (pid == -1 && errno == EINTR)
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goto again;
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}
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int wait_status;
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int
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wait_child(int pid)
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{
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pid_t term;
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struct child *cp;
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struct sigaction nact, oact;
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nact.sa_handler = SIG_DFL;
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sigemptyset(&nact.sa_mask);
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nact.sa_flags = SA_NOCLDSTOP;
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sigaction(SIGCHLD, &nact, &oact);
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cp = findchild(pid);
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if (!cp->done) {
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do {
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term = wait(&wait_status);
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if (term == -1 && errno == EINTR)
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continue;
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if (term == 0 || term == -1)
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break;
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cp = findchild(term);
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if (cp->free || term == pid) {
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delchild(cp);
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} else {
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cp->done = 1;
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cp->status = wait_status;
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}
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} while (term != pid);
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} else {
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wait_status = cp->status;
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delchild(cp);
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}
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sigaction(SIGCHLD, &oact, NULL);
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/*
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* Make sure no zombies are left.
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*/
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sigchild(SIGCHLD);
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if (WIFEXITED(wait_status) && (WEXITSTATUS(wait_status) == 0))
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return 0;
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return -1;
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}
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