1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (C) 2011 Hiroki Sato <hrs@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 PROJECT 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
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
23 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 *
30 */
31
32#include <sys/queue.h>
33#include <sys/types.h>
34#include <sys/socket.h>
35#include <sys/stat.h>
36#include <sys/un.h>
37#include <sys/uio.h>
38#include <net/if.h>
39#include <net/if_dl.h>
40#include <netinet/in.h>
41#include <netinet/icmp6.h>
42#include <fcntl.h>
43#include <errno.h>
44#include <netdb.h>
45#include <unistd.h>
46#include <signal.h>
47#include <string.h>
48#include <stdarg.h>
49#include <stdio.h>
50#include <stdlib.h>
51#include <syslog.h>
52
53#include "pathnames.h"
54#include "rtadvd.h"
55#include "if.h"
56#include "control.h"
57#include "control_client.h"
58
59int
60cm_handler_client(int fd, int state, char *buf_orig)
61{
62	char buf[CM_MSG_MAXLEN];
63	struct ctrl_msg_hdr *cm;
64	struct ctrl_msg_hdr *cm_orig;
65	int error;
66	char *msg;
67	char *msg_orig;
68
69	syslog(LOG_DEBUG, "<%s> enter", __func__);
70
71	memset(buf, 0, sizeof(buf));
72	cm = (struct ctrl_msg_hdr *)buf;
73	cm_orig = (struct ctrl_msg_hdr *)buf_orig;
74	msg = (char *)buf + sizeof(*cm);
75	msg_orig = (char *)buf_orig + sizeof(*cm_orig);
76
77	if (cm_orig->cm_len > CM_MSG_MAXLEN) {
78		syslog(LOG_DEBUG, "<%s> msg too long", __func__);
79		close(fd);
80		return (-1);
81	}
82	cm->cm_type = cm_orig->cm_type;
83	if (cm_orig->cm_len > sizeof(*cm_orig)) {
84		memcpy(msg, msg_orig, cm_orig->cm_len - sizeof(*cm));
85		cm->cm_len = cm_orig->cm_len;
86	}
87	while (state != CM_STATE_EOM) {
88		syslog(LOG_DEBUG, "<%s> state = %d", __func__, state);
89
90		switch (state) {
91		case CM_STATE_INIT:
92			state = CM_STATE_EOM;
93			break;
94		case CM_STATE_MSG_DISPATCH:
95			cm->cm_version = CM_VERSION;
96			error = cm_send(fd, buf);
97			if (error) {
98				syslog(LOG_WARNING,
99				    "<%s> cm_send()", __func__);
100				return (-1);
101			}
102			state = CM_STATE_ACK_WAIT;
103			break;
104		case CM_STATE_ACK_WAIT:
105			error = cm_recv(fd, buf);
106			if (error) {
107				syslog(LOG_ERR,
108				    "<%s> cm_recv()", __func__);
109				close(fd);
110				return (-1);
111			}
112			switch (cm->cm_type) {
113			case CM_TYPE_ACK:
114				syslog(LOG_DEBUG,
115				    "<%s> CM_TYPE_ACK", __func__);
116				break;
117			case CM_TYPE_ERR:
118				syslog(LOG_DEBUG,
119				    "<%s> CM_TYPE_ERR", __func__);
120				close(fd);
121				return (-1);
122			default:
123				syslog(LOG_DEBUG,
124				    "<%s> unknown status", __func__);
125				close(fd);
126				return (-1);
127			}
128			memcpy(buf_orig, buf, cm->cm_len);
129			state = CM_STATE_EOM;
130			break;
131		}
132	}
133	close(fd);
134	return (0);
135}
136