1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/* $OpenBSD: net_ctl.c,v 1.8 2006/06/02 20:09:43 mcbride Exp $ */
/*
* Copyright (c) 2005 Håkan Olsson. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This code was written under funding by Multicom Security AB.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "sasyncd.h"
#include "net.h"
struct ctlmsg {
u_int32_t type;
u_int32_t data;
u_int32_t data2;
};
int snapcount = 0;
static int
net_ctl_check_state(struct syncpeer *p, enum RUNSTATE nstate)
{
if (nstate < INIT || nstate > FAIL) {
log_msg(0, "net_ctl: got bad state %d from peer \"%s\"",
nstate, p->name);
net_ctl_send_error(p, CTL_STATE);
return -1;
}
if (cfgstate.runstate == MASTER && nstate == MASTER) {
log_msg(0, "net_ctl: got bad state MASTER from peer \"%s\"",
p->name);
net_ctl_send_error(p, CTL_STATE);
return -1;
}
if (p->runstate != nstate) {
p->runstate = nstate;
log_msg(1, "net_ctl: peer \"%s\" state change to %s", p->name,
carp_state_name(nstate));
}
return 0;
}
void
net_ctl_handle_msg(struct syncpeer *p, u_int8_t *msg, u_int32_t msglen)
{
struct ctlmsg *ctl = (struct ctlmsg *)msg;
enum RUNSTATE nstate;
enum CTLTYPE ctype;
static char *ct, *ctltype[] = CTLTYPES;
if (msglen < sizeof *ctl) {
log_msg(0, "net_ctl: got bad control message from peer \"%s\"",
p->name);
net_ctl_send_error(p, CTL_UNKNOWN);
return;
}
switch (ntohl(ctl->type)) {
case CTL_ENDSNAP:
log_msg(4, "net_ctl: got CTL_ENDSNAP from peer \"%s\"",
p->name);
/* XXX More sophistication required to handle multiple peers. */
if (carp_demoted) {
snapcount++;
if (snapcount >= cfgstate.peercnt)
monitor_carpundemote(NULL);
}
break;
case CTL_STATE:
log_msg(4, "net_ctl: got CTL_STATE from peer \"%s\"", p->name);
nstate = (enum RUNSTATE)ntohl(ctl->data);
if (net_ctl_check_state(p, nstate) == 0)
net_ctl_send_ack(p, CTL_STATE, cfgstate.runstate);
break;
case CTL_ERROR:
log_msg(1, "net_ctl: got ERROR from peer \"%s\"", p->name);
switch (ntohl(ctl->data)) {
case RESERVED: /* PFKEY -- nothing to do here for now */
break;
case CTL_STATE:
nstate = cfgstate.runstate;
carp_check_state();
if (nstate != cfgstate.runstate)
net_ctl_send_state(p);
break;
case CTL_UNKNOWN:
default:
break;
}
break;
case CTL_ACK:
ctype = (enum CTLTYPE)ntohl(ctl->data);
if (ctype < RESERVED || ctype > CTL_UNKNOWN)
ct = "<unknown>";
else
ct = ctltype[ctype];
log_msg(4, "net_ctl: got %s ACK from peer \"%s\"", ct,
p->name);
if (ctype == CTL_STATE) {
nstate = (enum RUNSTATE)ntohl(ctl->data2);
net_ctl_check_state(p, nstate);
}
break;
case CTL_UNKNOWN:
default:
log_msg(1, "net_ctl: got unknown msg type %u from peer \"%s\"",
ntohl(ctl->type), p->name);
break;
}
}
static int
net_ctl_send(struct syncpeer *p, u_int32_t type, u_int32_t d, u_int32_t d2)
{
struct ctlmsg *m = (struct ctlmsg *)malloc(sizeof *m);
if (!m) {
log_err("malloc(%u)", sizeof *m);
return -1;
}
memset(m, 0, sizeof *m);
m->type = htonl(type);
m->data = htonl(d);
m->data2 = htonl(d2);
return net_queue(p, MSG_SYNCCTL, (u_int8_t *)m, sizeof *m);
}
int
net_ctl_send_ack(struct syncpeer *p, enum CTLTYPE prevtype, u_int32_t code)
{
return net_ctl_send(p, CTL_ACK, (u_int32_t)prevtype, code);
}
int
net_ctl_send_state(struct syncpeer *p)
{
return net_ctl_send(p, CTL_STATE, (u_int32_t)cfgstate.runstate, 0);
}
int
net_ctl_send_error(struct syncpeer *p, enum CTLTYPE prevtype)
{
return net_ctl_send(p, CTL_ERROR, (u_int32_t)prevtype, 0);
}
int
net_ctl_send_endsnap(struct syncpeer *p)
{
return net_ctl_send(p, CTL_ENDSNAP, 0, 0);
}
/* After a CARP tracker state change, send an state ctl msg to all peers. */
void
net_ctl_update_state(void)
{
struct syncpeer *p;
/* We may have new peers available. */
net_connect();
for (p = LIST_FIRST(&cfgstate.peerlist); p; p = LIST_NEXT(p, link)) {
if (p->socket == -1)
continue;
log_msg(4, "net_ctl: sending my state %s to peer \"%s\"",
carp_state_name(cfgstate.runstate), p->name);
net_ctl_send_state(p);
}
}
|
