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/* $OpenBSD: config.c,v 1.31 2004/03/03 10:13:48 henning Exp $ */
/*
* Copyright (c) 2003, 2004 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/stat.h>
#include <sys/mman.h>
#include <errno.h>
#include <ifaddrs.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "bgpd.h"
#include "session.h"
void *sconf;
u_int32_t get_bgpid(void);
int host_v4(const char *, struct bgpd_addr *, u_int8_t *);
int host_v6(const char *, struct bgpd_addr *);
int
merge_config(struct bgpd_config *xconf, struct bgpd_config *conf,
struct peer *peer_l)
{
struct peer *p;
/* preserve cmd line opts */
conf->opts = xconf->opts;
if (!conf->as) {
log_warnx("configuration error: AS not given");
return (1);
}
if (!conf->min_holdtime)
conf->min_holdtime = MIN_HOLDTIME;
if (!conf->bgpid)
conf->bgpid = get_bgpid();
for (p = peer_l; p != NULL; p = p->next) {
p->conf.ebgp = (p->conf.remote_as != conf->as);
if (p->conf.announce_type == ANNOUNCE_UNDEF)
p->conf.announce_type = p->conf.ebgp == 0 ?
ANNOUNCE_ALL : ANNOUNCE_SELF;
if (p->conf.enforce_as == ENFORCE_AS_UNDEF)
p->conf.enforce_as = p->conf.ebgp == 0 ?
ENFORCE_AS_OFF : ENFORCE_AS_ON;
}
memcpy(xconf, conf, sizeof(struct bgpd_config));
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) == -1)
fatal("getifaddrs");
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);
}
int
check_file_secrecy(int fd, const char *fname)
{
struct stat st;
if (fstat(fd, &st)) {
log_warn("cannot stat %s", fname);
return (-1);
}
if (st.st_uid != 0 && st.st_uid != getuid()) {
log_warnx("%s: owner not root or current user", fname);
return (-1);
}
if (st.st_mode & (S_IRWXG | S_IRWXO)) {
log_warnx("%s: group/world readable/writeable", fname);
return (-1);
}
return (0);
}
int
host(const char *s, struct bgpd_addr *h, u_int8_t *len)
{
int done = 0;
int mask;
char *p, *q, *ps;
if ((p = strrchr(s, '/')) != NULL) {
mask = strtol(p+1, &q, 0);
if (!q || *q || mask > 128 || q == (p+1)) {
log_warnx("invalid netmask");
return (0);
}
if ((ps = malloc(strlen(s) - strlen(p) + 1)) == NULL)
fatal("host: malloc");
strlcpy(ps, s, strlen(s) - strlen(p) + 1);
} else {
if ((ps = strdup(s)) == NULL)
fatal("host: strdup");
mask = 128;
}
bzero(h, sizeof(struct bgpd_addr));
/* IPv4 address? */
if (!done)
done = host_v4(s, h, len);
/* IPv6 address? */
if (!done) {
done = host_v6(ps, h);
*len = mask;
}
free(ps);
return (done);
}
int
host_v4(const char *s, struct bgpd_addr *h, u_int8_t *len)
{
struct in_addr ina;
int bits = 32;
memset(&ina, 0, sizeof(struct in_addr));
if (strrchr(s, '/') != NULL) {
if ((bits = inet_net_pton(AF_INET, s, &ina, sizeof(ina))) == -1)
return (0);
} else {
if (inet_pton(AF_INET, s, &ina) != 1)
return (0);
}
h->af = AF_INET;
h->v4.s_addr = ina.s_addr;
*len = bits;
return (1);
}
int
host_v6(const char *s, struct bgpd_addr *h)
{
struct addrinfo hints, *res;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_DGRAM; /*dummy*/
hints.ai_flags = AI_NUMERICHOST;
if (getaddrinfo(s, "0", &hints, &res) == 0) {
h->af = AF_INET6;
memcpy(&h->v6,
&((struct sockaddr_in6 *)res->ai_addr)->sin6_addr,
sizeof(h->v6));
h->scope_id =
((struct sockaddr_in6 *)res->ai_addr)->sin6_scope_id;
freeaddrinfo(res);
return (1);
}
return (0);
}
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