1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/*-
* Copyright (c) 2009 Ed Schouten <ed@FreeBSD.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 BY THE AUTHOR 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 AUTHOR 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>
__FBSDID("$FreeBSD$");
#include <sys/wait.h>
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <sysexits.h>
#include <unistd.h>
#include "ulog.h"
#define _PATH_ULOG_HELPER "/usr/libexec/ulog-helper"
/*
* Registering login sessions.
*/
static void
ulog_exec_helper(int fd, char const * const argv[])
{
sigset_t oblock, nblock;
pid_t pid, wpid;
int status;
/* Block SIGCHLD. */
sigemptyset(&nblock);
sigaddset(&nblock, SIGCHLD);
sigprocmask(SIG_BLOCK, &nblock, &oblock);
switch (pid = fork()) {
case -1:
break;
case 0:
/* Execute helper program. */
if (dup2(fd, STDIN_FILENO) == -1)
exit(EX_UNAVAILABLE);
sigprocmask(SIG_SETMASK, &oblock, NULL);
execv(_PATH_ULOG_HELPER, __DECONST(char * const *, argv));
exit(EX_UNAVAILABLE);
default:
/* Wait for helper to finish. */
do {
wpid = waitpid(pid, &status, 0);
} while (wpid == -1 && errno == EINTR);
break;
}
sigprocmask(SIG_SETMASK, &oblock, NULL);
}
void
ulog_login_pseudo(int fd, const char *host)
{
char const * const args[4] = { "ulog-helper", "login", host, NULL };
ulog_exec_helper(fd, args);
}
void
ulog_logout_pseudo(int fd)
{
char const * const args[3] = { "ulog-helper", "logout", NULL };
ulog_exec_helper(fd, args);
}
|
