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/* $OpenBSD: net_ctl.c,v 1.11 2016/07/18 21:22:09 benno 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(2, "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(2, "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(2, "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 = malloc(sizeof *m);
if (!m) {
log_err("malloc(%zu)", 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(2, "net_ctl: sending my state %s to peer \"%s\"",
carp_state_name(cfgstate.runstate), p->name);
net_ctl_send_state(p);
}
}
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