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Remove the oh so funny "LOSS OF MIND" from the diclaimer that was not
part of the original ISC license that we use in OpenBSD.  Done for
files were Henning is the original author.

OK henning@ deraadt@

/*	$OpenBSD: server.c,v 1.44 2016/09/03 11:52:06 reyk 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 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);
}