1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (C) 2011 Hiroki Sato <[email protected]>
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
59 int
cm_handler_client(int fd,int state,char * buf_orig)60 cm_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