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/* $NetBSD: server.c,v 1.3 2014/03/30 02:53:11 dholland Exp $ */
/*
* Copyright (c) 1983-2003, Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* + Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* + 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.
* + Neither the name of the University of California, San Francisco nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT
* OWNER OR CONTRIBUTORS 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.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: server.c,v 1.3 2014/03/30 02:53:11 dholland Exp $");
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/poll.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <curses.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ifaddrs.h>
#include "hunt_common.h"
#include "pathnames.h"
#include "hunt_private.h"
#ifdef INTERNET
/*
* Code for finding and talking to hunt daemons.
*/
static SOCKET *listv;
static unsigned int listmax;
static bool initial = true;
static struct in_addr local_address;
static int brdc;
static SOCKET *brdv;
static void
serverlist_setup(void)
{
char local_name[MAXHOSTNAMELEN + 1];
struct hostent *hp;
if (gethostname(local_name, sizeof(local_name)) < 0) {
leavex(1, "Sorry, I have no hostname.");
}
local_name[sizeof(local_name) - 1] = '\0';
if ((hp = gethostbyname(local_name)) == NULL) {
leavex(1, "Can't find myself.");
}
memcpy(&local_address, hp->h_addr, sizeof(local_address));
listmax = 20;
listv = malloc(listmax * sizeof(listv[0]));
if (listv == NULL) {
leavex(1, "Out of memory.");
}
}
static int
getbroadcastaddrs(int s /*socket*/, struct sockaddr_in **vector)
{
int vec_cnt;
struct ifaddrs *ifp, *ip;
*vector = NULL;
if (getifaddrs(&ifp) < 0)
return 0;
vec_cnt = 0;
for (ip = ifp; ip; ip = ip->ifa_next)
if ((ip->ifa_addr->sa_family == AF_INET) &&
(ip->ifa_flags & IFF_BROADCAST))
vec_cnt++;
*vector = malloc(vec_cnt * sizeof(struct sockaddr_in));
vec_cnt = 0;
for (ip = ifp; ip; ip = ip->ifa_next)
if ((ip->ifa_addr->sa_family == AF_INET) &&
(ip->ifa_flags & IFF_BROADCAST))
memcpy(&(*vector)[vec_cnt++], ip->ifa_broadaddr,
sizeof(struct sockaddr_in));
freeifaddrs(ifp);
return vec_cnt;
}
static void
get_responses(int contactsock)
{
u_short port_num;
unsigned j;
unsigned int listc;
struct pollfd set[1];
socklen_t addrlen;
listc = 0;
addrlen = sizeof(listv[0]);
errno = 0;
set[0].fd = contactsock;
set[0].events = POLLIN;
for (;;) {
if (listc + 1 >= listmax) {
SOCKET *newlistv;
listmax += 20;
newlistv = realloc(listv, listmax * sizeof(*listv));
if (newlistv == NULL)
leave(1, "realloc");
listv = newlistv;
}
if (poll(set, 1, 1000) == 1 &&
recvfrom(contactsock, &port_num, sizeof(port_num),
0, (struct sockaddr *) &listv[listc], &addrlen) > 0) {
/*
* Note that we do *not* convert from network to host
* order since the port number *should* be in network
* order:
*/
for (j = 0; j < listc; j += 1)
if (listv[listc].sin_addr.s_addr
== listv[j].sin_addr.s_addr)
break;
if (j == listc)
listv[listc++].sin_port = port_num;
continue;
}
if (errno != 0 && errno != EINTR) {
leave(1, "poll/recvfrom");
}
/* terminate list with local address */
listv[listc].sin_family = SOCK_FAMILY;
listv[listc].sin_addr = local_address;
listv[listc].sin_port = htons(0);
(void) close(contactsock);
initial = false;
break;
}
}
SOCKET *
list_drivers(void)
{
struct hostent *hp;
struct sockaddr_in contactaddr;
int option;
u_short msg;
int contactsock;
int i;
if (initial) {
/* do one time initialization */
serverlist_setup();
} else if (Sock_host != NULL)
return listv; /* address already valid */
contactsock = socket(SOCK_FAMILY, SOCK_DGRAM, 0);
if (contactsock < 0) {
leave(1, "socket system call failed");
}
contactaddr.sin_family = SOCK_FAMILY;
contactaddr.sin_port = htons(Test_port);
if (Sock_host != NULL) { /* explicit host given */
if ((hp = gethostbyname(Sock_host)) == NULL) {
leavex(1, "Unknown host");
/* NOTREACHED */
}
memcpy(&contactaddr.sin_addr, hp->h_addr,
sizeof(contactaddr.sin_addr));
msg = htons(C_TESTMSG());
(void) sendto(contactsock, &msg, sizeof msg, 0,
(struct sockaddr *)&contactaddr,
sizeof(contactaddr));
get_responses(contactsock);
return listv;
}
if (!initial) {
/* favor host of previous session by broadcasting to it first */
contactaddr.sin_addr = Daemon.sin_addr;
msg = htons(C_PLAYER); /* Must be playing! */
(void) sendto(contactsock, &msg, sizeof msg, 0,
(struct sockaddr *)&contactaddr, sizeof(contactaddr));
}
if (initial)
brdc = getbroadcastaddrs(contactsock, &brdv);
#ifdef SO_BROADCAST
/* Sun's will broadcast even though this option can't be set */
option = 1;
if (setsockopt(contactsock, SOL_SOCKET, SO_BROADCAST,
&option, sizeof option) < 0) {
leave(1, "setsockopt broadcast");
/* NOTREACHED */
}
#endif
/* send broadcast packets on all interfaces */
msg = htons(C_TESTMSG());
for (i = 0; i < brdc; i++) {
contactaddr.sin_addr = brdv[i].sin_addr;
if (sendto(contactsock, &msg, sizeof msg, 0,
(struct sockaddr *)&contactaddr,
sizeof(contactaddr)) < 0) {
leave(1, "sendto");
}
}
contactaddr.sin_addr = local_address;
if (sendto(contactsock, &msg, sizeof msg, 0,
(struct sockaddr *)&contactaddr, sizeof(contactaddr)) < 0) {
leave(1, "sendto");
}
get_responses(contactsock);
return listv;
}
#endif /* INTERNET */
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