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/* $OpenBSD: server.c,v 1.43 2015/07/18 00:53:44 bcook Exp $ */
/*
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
* Copyright (c) 2004 Alexander Guy <alexander@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 MIND, 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/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <errno.h>
#include <ifaddrs.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "ntpd.h"
int
setup_listeners(struct servent *se, struct ntpd_conf *lconf, u_int *cnt)
{
struct listen_addr *la, *nla, *lap;
struct ifaddrs *ifa, *ifap;
struct sockaddr *sa;
struct if_data *ifd;
u_int8_t *a6;
size_t sa6len = sizeof(struct in6_addr);
u_int new_cnt = 0;
int tos = IPTOS_LOWDELAY, rdomain = 0;
TAILQ_FOREACH(lap, &lconf->listen_addrs, entry) {
switch (lap->sa.ss_family) {
case AF_UNSPEC:
if (getifaddrs(&ifa) == -1)
fatal("getifaddrs");
for (ifap = ifa; ifap != NULL; ifap = ifap->ifa_next) {
sa = ifap->ifa_addr;
if (sa == NULL || SA_LEN(sa) == 0)
continue;
if (sa->sa_family == AF_LINK) {
ifd = ifap->ifa_data;
rdomain = ifd->ifi_rdomain;
}
if (sa->sa_family != AF_INET &&
sa->sa_family != AF_INET6)
continue;
if (lap->rtable != -1 && rdomain != lap->rtable)
continue;
if (sa->sa_family == AF_INET &&
((struct sockaddr_in *)sa)->sin_addr.s_addr ==
INADDR_ANY)
continue;
if (sa->sa_family == AF_INET6) {
a6 = ((struct sockaddr_in6 *)sa)->
sin6_addr.s6_addr;
if (memcmp(a6, &in6addr_any, sa6len) == 0)
continue;
}
if ((la = calloc(1, sizeof(struct listen_addr))) ==
NULL)
fatal("setup_listeners calloc");
memcpy(&la->sa, sa, SA_LEN(sa));
la->rtable = rdomain;
TAILQ_INSERT_TAIL(&lconf->listen_addrs, la, entry);
}
freeifaddrs(ifa);
default:
continue;
}
}
for (la = TAILQ_FIRST(&lconf->listen_addrs); la; ) {
switch (la->sa.ss_family) {
case AF_INET:
if (((struct sockaddr_in *)&la->sa)->sin_port == 0)
((struct sockaddr_in *)&la->sa)->sin_port =
se->s_port;
break;
case AF_INET6:
if (((struct sockaddr_in6 *)&la->sa)->sin6_port == 0)
((struct sockaddr_in6 *)&la->sa)->sin6_port =
se->s_port;
break;
case AF_UNSPEC:
nla = TAILQ_NEXT(la, entry);
TAILQ_REMOVE(&lconf->listen_addrs, la, entry);
free(la);
la = nla;
continue;
default:
fatalx("king bula sez: af borked");
}
log_info("listening on %s %s",
log_sockaddr((struct sockaddr *)&la->sa),
print_rtable(la->rtable));
if ((la->fd = socket(la->sa.ss_family, SOCK_DGRAM, 0)) == -1)
fatal("socket");
if (la->sa.ss_family == AF_INET && setsockopt(la->fd,
IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) == -1)
log_warn("setsockopt IPTOS_LOWDELAY");
if (la->rtable != -1 &&
setsockopt(la->fd, SOL_SOCKET, SO_RTABLE, &la->rtable,
sizeof(la->rtable)) == -1)
fatal("setup_listeners setsockopt SO_RTABLE");
if (bind(la->fd, (struct sockaddr *)&la->sa,
SA_LEN((struct sockaddr *)&la->sa)) == -1) {
log_warn("bind on %s failed, skipping",
log_sockaddr((struct sockaddr *)&la->sa));
close(la->fd);
nla = TAILQ_NEXT(la, entry);
TAILQ_REMOVE(&lconf->listen_addrs, la, entry);
free(la);
la = nla;
continue;
}
new_cnt++;
la = TAILQ_NEXT(la, entry);
}
*cnt = new_cnt;
return (0);
}
int
server_dispatch(int fd, struct ntpd_conf *lconf)
{
ssize_t size;
double rectime;
struct sockaddr_storage fsa;
socklen_t fsa_len;
struct ntp_msg query, reply;
char buf[NTP_MSGSIZE];
fsa_len = sizeof(fsa);
if ((size = recvfrom(fd, &buf, sizeof(buf), 0,
(struct sockaddr *)&fsa, &fsa_len)) == -1) {
if (errno == EHOSTUNREACH || errno == EHOSTDOWN ||
errno == ENETUNREACH || errno == ENETDOWN) {
log_warn("recvfrom %s",
log_sockaddr((struct sockaddr *)&fsa));
return (0);
} else
fatal("recvfrom");
}
rectime = gettime_corrected();
if (ntp_getmsg((struct sockaddr *)&fsa, buf, size, &query) == -1)
return (0);
memset(&reply, 0, sizeof(reply));
if (lconf->status.synced)
reply.status = lconf->status.leap;
else
reply.status = LI_ALARM;
reply.status |= (query.status & VERSIONMASK);
if ((query.status & MODEMASK) == MODE_CLIENT)
reply.status |= MODE_SERVER;
else if ((query.status & MODEMASK) == MODE_SYM_ACT)
reply.status |= MODE_SYM_PAS;
else /* ignore packets of different type (e.g. bcast) */
return (0);
reply.stratum = lconf->status.stratum;
reply.ppoll = query.ppoll;
reply.precision = lconf->status.precision;
reply.rectime = d_to_lfp(rectime);
reply.reftime = d_to_lfp(lconf->status.reftime);
reply.xmttime = d_to_lfp(gettime_corrected());
reply.orgtime = query.xmttime;
reply.rootdelay = d_to_sfp(lconf->status.rootdelay);
reply.refid = lconf->status.refid;
ntp_sendmsg(fd, (struct sockaddr *)&fsa, &reply);
return (0);
}
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