IABSD.fr/src/libexec/lockspool/lockspool.c

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• Author : millert
  Date : 2020-02-09 14:59:20
  Hash : e1869fb3
  Message : Use sysexits.h exit values to distinguish between tempfail and permfail. Unix MTAs use the exit value of the MDA (here mail.local) to determine whether or not a failure to deliver mail should be considered to be a temporary or permanent failure. OK semarie@ beck@

• libexec/lockspool/lockspool.c

• /*	$OpenBSD: lockspool.c,v 1.21 2020/02/09 14:59:20 millert Exp $	*/
  
  /*
   * Copyright (c) 1998 Theo de Raadt <deraadt@theos.com>
   * Copyright (c) 1998 Todd C. Miller <millert@openbsd.org>
   * All rights reserved.
   *
   * 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 ``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 AUTHORS 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 <signal.h>
  #include <pwd.h>
  #include <syslog.h>
  #include <unistd.h>
  #include <errno.h>
  #include <stdio.h>
  #include <paths.h>
  #include <stdlib.h>
  #include <poll.h>
  #include <err.h>
  
  #include "mail.local.h"
  
  void unhold(int);
  void usage(void);
  
  extern char *__progname;
  
  int
  main(int argc, char *argv[])
  {
  	struct passwd *pw;
  	struct pollfd pfd;
  	ssize_t nread;
  	char *from, c;
  	int holdfd;
  
  	if (unveil(_PATH_MAILDIR, "rwc") == -1)
  		err(1, "unveil");
  	if (pledge("stdio rpath wpath getpw cpath fattr", NULL) == -1)
  		err(1, "pledge");
  
  	openlog(__progname, LOG_PERROR, LOG_MAIL);
  
  	if (argc != 1 && argc != 2)
  		usage();
  	if (argc == 2 && getuid() != 0)
  		merr(1, "you must be root to lock someone else's spool");
  
  	signal(SIGTERM, unhold);
  	signal(SIGINT, unhold);
  	signal(SIGHUP, unhold);
  	signal(SIGPIPE, unhold);
  
  	if (argc == 2)
  		pw = getpwnam(argv[1]);
  	else
  		pw = getpwuid(getuid());
  	if (pw == NULL)
  		exit (1);
  	from = pw->pw_name;
  
  	holdfd = getlock(from, pw);
  	if (holdfd == -1) {
  		write(STDOUT_FILENO, "0\n", 2);
  		exit (1);
  	}
  	write(STDOUT_FILENO, "1\n", 2);
  
  	/* wait for the other end of the pipe to close, then release the lock */
  	pfd.fd = STDIN_FILENO;
  	pfd.events = POLLIN;
  	do {
  		if (poll(&pfd, 1, INFTIM) == -1) {
  			if (errno != EINTR)
  				break;
  		}
  		do {
  			nread = read(STDIN_FILENO, &c, 1);
  		} while (nread == 1 || (nread == -1 && errno == EINTR));
  	} while (nread == -1 && errno == EAGAIN);
  	rellock();
  	exit (0);
  }
  
  /*ARGSUSED*/
  void
  unhold(int signo)
  {
  
  	rellock();
  	_exit(0);
  }
  
  void
  usage(void)
  {
  
  	merr(1, "usage: %s [username]", __progname);
  }