1/*	$NetBSD$	*/
2
3/*++
4/* NAME
5/*	unix_trigger 3
6/* SUMMARY
7/*	wakeup UNIX-domain server
8/* SYNOPSIS
9/*	#include <trigger.h>
10/*
11/*	int	unix_trigger(service, buf, len, timeout)
12/*	const char *service;
13/*	const char *buf;
14/*	ssize_t	len;
15/*	int	timeout;
16/* DESCRIPTION
17/*	unix_trigger() wakes up the named UNIX-domain server by making
18/*	a brief connection to it and writing the named buffer.
19/*
20/*	The connection is closed by a background thread. Some kernels
21/*	cannot handle client-side disconnect before the server has
22/*	received the message.
23/*
24/*	Arguments:
25/* .IP service
26/*	Name of the communication endpoint.
27/* .IP buf
28/*	Address of data to be written.
29/* .IP len
30/*	Amount of data to be written.
31/* .IP timeout
32/*	Deadline in seconds. Specify a value <= 0 to disable
33/*	the time limit.
34/* DIAGNOSTICS
35/*	The result is zero in case of success, -1 in case of problems.
36/* SEE ALSO
37/*	unix_connect(3), UNIX-domain client
38/* LICENSE
39/* .ad
40/* .fi
41/*	The Secure Mailer license must be distributed with this software.
42/* AUTHOR(S)
43/*	Wietse Venema
44/*	IBM T.J. Watson Research
45/*	P.O. Box 704
46/*	Yorktown Heights, NY 10598, USA
47/*--*/
48
49/* System library. */
50
51#include <sys_defs.h>
52#include <sys/socket.h>
53#include <unistd.h>
54#include <string.h>
55
56/* Utility library. */
57
58#include <msg.h>
59#include <connect.h>
60#include <iostuff.h>
61#include <mymalloc.h>
62#include <events.h>
63#include <trigger.h>
64
65struct unix_trigger {
66    int     fd;
67    char   *service;
68};
69
70/* unix_trigger_event - disconnect from peer */
71
72static void unix_trigger_event(int event, char *context)
73{
74    struct unix_trigger *up = (struct unix_trigger *) context;
75    static const char *myname = "unix_trigger_event";
76
77    /*
78     * Disconnect.
79     */
80    if (event == EVENT_TIME)
81	msg_warn("%s: read timeout for service %s", myname, up->service);
82    event_disable_readwrite(up->fd);
83    event_cancel_timer(unix_trigger_event, context);
84    if (close(up->fd) < 0)
85	msg_warn("%s: close %s: %m", myname, up->service);
86    myfree(up->service);
87    myfree((char *) up);
88}
89
90/* unix_trigger - wakeup UNIX-domain server */
91
92int     unix_trigger(const char *service, const char *buf, ssize_t len, int timeout)
93{
94    const char *myname = "unix_trigger";
95    struct unix_trigger *up;
96    int     fd;
97
98    if (msg_verbose > 1)
99	msg_info("%s: service %s", myname, service);
100
101    /*
102     * Connect...
103     */
104    if ((fd = unix_connect(service, BLOCKING, timeout)) < 0) {
105	if (msg_verbose)
106	    msg_warn("%s: connect to %s: %m", myname, service);
107	return (-1);
108    }
109    close_on_exec(fd, CLOSE_ON_EXEC);
110
111    /*
112     * Stash away context.
113     */
114    up = (struct unix_trigger *) mymalloc(sizeof(*up));
115    up->fd = fd;
116    up->service = mystrdup(service);
117
118    /*
119     * Write the request...
120     */
121    if (write_buf(fd, buf, len, timeout) < 0
122	|| write_buf(fd, "", 1, timeout) < 0)
123	if (msg_verbose)
124	    msg_warn("%s: write to %s: %m", myname, service);
125
126    /*
127     * Wakeup when the peer disconnects, or when we lose patience.
128     */
129    if (timeout > 0)
130	event_request_timer(unix_trigger_event, (char *) up, timeout + 100);
131    event_enable_read(fd, unix_trigger_event, (char *) up);
132    return (0);
133}
134