1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
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 */
29
30#include <sys/queue.h>
31#include <sys/types.h>
32#include <sys/socket.h>
33#include <sys/stat.h>
34#include <sys/un.h>
35#include <sys/uio.h>
36#include <net/if.h>
37#include <net/if_dl.h>
38#include <netinet/in.h>
39#include <netinet/icmp6.h>
40#include <fcntl.h>
41#include <errno.h>
42#include <netdb.h>
43#include <unistd.h>
44#include <signal.h>
45#include <string.h>
46#include <stdarg.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <syslog.h>
50
51#include "pathnames.h"
52#include "rtadvd.h"
53#include "if.h"
54#include "control.h"
55#include "control_client.h"
56
57int
58cm_handler_client(int fd, int state, char *buf_orig)
59{
60	char buf[CM_MSG_MAXLEN];
61	struct ctrl_msg_hdr *cm;
62	struct ctrl_msg_hdr *cm_orig;
63	int error;
64	char *msg;
65	char *msg_orig;
66
67	syslog(LOG_DEBUG, "<%s> enter", __func__);
68
69	memset(buf, 0, sizeof(buf));
70	cm = (struct ctrl_msg_hdr *)buf;
71	cm_orig = (struct ctrl_msg_hdr *)buf_orig;
72	msg = (char *)buf + sizeof(*cm);
73	msg_orig = (char *)buf_orig + sizeof(*cm_orig);
74
75	if (cm_orig->cm_len > CM_MSG_MAXLEN) {
76		syslog(LOG_DEBUG, "<%s> msg too long", __func__);
77		close(fd);
78		return (-1);
79	}
80	cm->cm_type = cm_orig->cm_type;
81	if (cm_orig->cm_len > sizeof(*cm_orig)) {
82		memcpy(msg, msg_orig, cm_orig->cm_len - sizeof(*cm));
83		cm->cm_len = cm_orig->cm_len;
84	}
85	while (state != CM_STATE_EOM) {
86		syslog(LOG_DEBUG, "<%s> state = %d", __func__, state);
87
88		switch (state) {
89		case CM_STATE_INIT:
90			state = CM_STATE_EOM;
91			break;
92		case CM_STATE_MSG_DISPATCH:
93			cm->cm_version = CM_VERSION;
94			error = cm_send(fd, buf);
95			if (error) {
96				syslog(LOG_WARNING,
97				    "<%s> cm_send()", __func__);
98				return (-1);
99			}
100			state = CM_STATE_ACK_WAIT;
101			break;
102		case CM_STATE_ACK_WAIT:
103			error = cm_recv(fd, buf);
104			if (error) {
105				syslog(LOG_ERR,
106				    "<%s> cm_recv()", __func__);
107				close(fd);
108				return (-1);
109			}
110			switch (cm->cm_type) {
111			case CM_TYPE_ACK:
112				syslog(LOG_DEBUG,
113				    "<%s> CM_TYPE_ACK", __func__);
114				break;
115			case CM_TYPE_ERR:
116				syslog(LOG_DEBUG,
117				    "<%s> CM_TYPE_ERR", __func__);
118				close(fd);
119				return (-1);
120			default:
121				syslog(LOG_DEBUG,
122				    "<%s> unknown status", __func__);
123				close(fd);
124				return (-1);
125			}
126			memcpy(buf_orig, buf, cm->cm_len);
127			state = CM_STATE_EOM;
128			break;
129		}
130	}
131	close(fd);
132	return (0);
133}
134