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/* $OpenBSD: config.c,v 1.3 2003/12/23 01:06:21 henning Exp $ */
/*
* Copyright (c) 2003 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/mman.h>
#include <errno.h>
#include <ifaddrs.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "bgpd.h"
void *sconf;
u_int32_t get_bgpid(void);
u_int32_t get_id(struct peer *);
int
merge_config(struct bgpd_config *xconf, struct bgpd_config *conf)
{
enum reconf_action reconf = RECONF_NONE;
struct peer *p;
/* merge conf (new) into xconf (old) */
if (!conf->as) {
logit(LOG_CRIT, "configuration error: AS not given");
return (1);
}
if (xconf->as != conf->as) {
xconf->as = conf->as;
reconf = RECONF_REINIT;
}
if (conf->bgpid && xconf->bgpid != conf->bgpid) {
xconf->bgpid = conf->bgpid;
reconf = RECONF_REINIT;
}
if (!xconf->bgpid)
xconf->bgpid = get_bgpid();
if (conf->holdtime && !xconf->holdtime)
xconf->holdtime = conf->holdtime;
if (!conf->holdtime && xconf->holdtime)
conf->holdtime = xconf->holdtime;
if (conf->min_holdtime && !xconf->min_holdtime)
xconf->min_holdtime = conf->min_holdtime;
if (!conf->min_holdtime && xconf->min_holdtime)
conf->min_holdtime = xconf->min_holdtime;
if (!xconf->min_holdtime)
xconf->min_holdtime = conf->min_holdtime = MIN_HOLDTIME;
memcpy(&xconf->listen_addr, &conf->listen_addr,
sizeof(xconf->listen_addr));
/*
* as we cannot get the negotiated holdtime in the main process,
* the session engine needs to check it against the possibly new values
* and decide on session reestablishment.
*/
xconf->holdtime = conf->holdtime;
xconf->min_holdtime = conf->min_holdtime;
for (p = conf->peers; p != NULL; p = p->next) {
p->conf.reconf_action = reconf;
p->conf.ebgp = (p->conf.remote_as != xconf->as);
if (!p->conf.id)
p->conf.id = get_id(p);
}
/* merge peers done by session egine except for initial config */
xconf->peers = conf->peers;
free(conf);
return (0);
}
u_int32_t
get_bgpid(void)
{
struct ifaddrs *ifap, *ifa;
u_int32_t ip = 0, cur, localnet;
localnet = inet_addr("127.0.0.0");
if (getifaddrs(&ifap) < 0)
fatal("getifaddrs", errno);
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
cur = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr;
if ((cur & localnet) == localnet) /* skip 127/8 */
continue;
if (cur > ip)
ip = cur;
}
freeifaddrs(ifap);
return (ip);
}
u_int32_t
get_id(struct peer *p)
{
/*
* XXX this collides with multiviews and will need more clue later XXX
*/
return (ntohl(p->conf.remote_addr.sin_addr.s_addr));
}
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