rtadvd - Import newer rtadvd, add rtadvctl from FreeBSD-10
[dragonfly.git] / usr.sbin / rtadvd / control_client.c
1 /*-
2  * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS
18  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
21  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  *
26  * $FreeBSD: stable/10/usr.sbin/rtadvd/control_client.c 225519 2011-09-12 23:52:55Z hrs $
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
57 int
58 cm_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                         state = CM_STATE_ACK_WAIT;
99                         break;
100                 case CM_STATE_ACK_WAIT:
101                         error = cm_recv(fd, buf);
102                         if (error) {
103                                 syslog(LOG_ERR,
104                                     "<%s> cm_recv()", __func__);
105                                 close(fd);
106                                 return (-1);
107                         }
108                         switch (cm->cm_type) {
109                         case CM_TYPE_ACK:
110                                 syslog(LOG_DEBUG,
111                                     "<%s> CM_TYPE_ACK", __func__);
112                                 break;
113                         case CM_TYPE_ERR:
114                                 syslog(LOG_DEBUG,
115                                     "<%s> CM_TYPE_ERR", __func__);
116                                 close(fd);
117                                 return (-1);
118                         default:
119                                 syslog(LOG_DEBUG,
120                                     "<%s> unknown status", __func__);
121                                 close(fd);
122                                 return (-1);
123                         }
124                         memcpy(buf_orig, buf, cm->cm_len);
125                         state = CM_STATE_EOM;
126                         break;
127                 }
128         }
129         close(fd);
130         return (0);
131 }