1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2009 Ed Schouten <ed@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #include <sys/wait.h>
31
32 #include <errno.h>
33 #include <signal.h>
34 #include <stdlib.h>
35 #include <sysexits.h>
36 #include <unistd.h>
37 #include "ulog.h"
38
39 #define _PATH_ULOG_HELPER "/usr/libexec/ulog-helper"
40
41 /*
42 * Registering login sessions.
43 */
44
45 static void
ulog_exec_helper(int fd,char const * const argv[])46 ulog_exec_helper(int fd, char const * const argv[])
47 {
48 sigset_t oblock, nblock;
49 pid_t pid, wpid;
50 int status;
51
52 /* Block SIGCHLD. */
53 sigemptyset(&nblock);
54 sigaddset(&nblock, SIGCHLD);
55 sigprocmask(SIG_BLOCK, &nblock, &oblock);
56
57 switch (pid = fork()) {
58 case -1:
59 break;
60 case 0:
61 /* Execute helper program. */
62 if (dup2(fd, STDIN_FILENO) == -1)
63 exit(EX_UNAVAILABLE);
64 sigprocmask(SIG_SETMASK, &oblock, NULL);
65 execv(_PATH_ULOG_HELPER, __DECONST(char * const *, argv));
66 exit(EX_UNAVAILABLE);
67 default:
68 /* Wait for helper to finish. */
69 do {
70 wpid = waitpid(pid, &status, 0);
71 } while (wpid == -1 && errno == EINTR);
72 break;
73 }
74
75 sigprocmask(SIG_SETMASK, &oblock, NULL);
76 }
77
78 void
ulog_login_pseudo(int fd,const char * host)79 ulog_login_pseudo(int fd, const char *host)
80 {
81 char const * const args[4] = { "ulog-helper", "login", host, NULL };
82
83 ulog_exec_helper(fd, args);
84 }
85
86 void
ulog_logout_pseudo(int fd)87 ulog_logout_pseudo(int fd)
88 {
89 char const * const args[3] = { "ulog-helper", "logout", NULL };
90
91 ulog_exec_helper(fd, args);
92 }
93