383 lines
8.5 KiB
C
383 lines
8.5 KiB
C
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/* X-Chat
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* Copyright (C) 2001 Peter Zelezny.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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/* ipv4 and ipv6 networking functions with a common interface */
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <glib.h>
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#include "../../config.h" /* grab USE_IPV6 and LOOKUPD defines */
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#define WANTSOCKET
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#define WANTARPA
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#define WANTDNS
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#include "inet.h"
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#define NETWORK_PRIVATE
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#include "network.h"
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#define RAND_INT(n) ((int)(rand() / (RAND_MAX + 1.0) * (n)))
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/* ================== COMMON ================= */
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static void
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net_set_socket_options (int sok)
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{
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socklen_t sw;
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sw = 1;
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setsockopt (sok, SOL_SOCKET, SO_REUSEADDR, (char *) &sw, sizeof (sw));
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sw = 1;
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setsockopt (sok, SOL_SOCKET, SO_KEEPALIVE, (char *) &sw, sizeof (sw));
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}
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char *
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net_ip (guint32 addr)
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{
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struct in_addr ia;
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ia.s_addr = htonl (addr);
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return inet_ntoa (ia);
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}
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void
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net_store_destroy (netstore * ns)
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{
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#ifdef USE_IPV6
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if (ns->ip6_hostent)
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freeaddrinfo (ns->ip6_hostent);
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#endif
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free (ns);
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}
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netstore *
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net_store_new (void)
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{
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netstore *ns;
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ns = malloc (sizeof (netstore));
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memset (ns, 0, sizeof (netstore));
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return ns;
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}
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#ifndef USE_IPV6
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/* =================== IPV4 ================== */
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/*
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A note about net_resolve and lookupd:
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Many IRC networks rely on round-robin DNS for load balancing, rotating the list
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of IP address on each query. However, this method breaks when DNS queries are
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cached. Mac OS X and Darwin handle DNS lookups through the lookupd daemon, which
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caches queries in its default configuration: thus, if we always pick the first
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address, we will be stuck with the same host (which might be down!) until the
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TTL reaches 0 or lookupd is reset (typically, at reboot). Therefore, we need to
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pick a random address from the result list, instead of always using the first.
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*/
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char *
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net_resolve (netstore * ns, char *hostname, int port, char **real_host)
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{
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ns->ip4_hostent = gethostbyname (hostname);
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if (!ns->ip4_hostent)
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return NULL;
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memset (&ns->addr, 0, sizeof (ns->addr));
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#ifdef LOOKUPD
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int count = 0;
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while (ns->ip4_hostent->h_addr_list[count]) count++;
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memcpy (&ns->addr.sin_addr,
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ns->ip4_hostent->h_addr_list[RAND_INT(count)],
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ns->ip4_hostent->h_length);
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#else
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memcpy (&ns->addr.sin_addr, ns->ip4_hostent->h_addr,
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ns->ip4_hostent->h_length);
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#endif
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ns->addr.sin_port = htons (port);
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ns->addr.sin_family = AF_INET;
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*real_host = strdup (ns->ip4_hostent->h_name);
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return strdup (inet_ntoa (ns->addr.sin_addr));
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}
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int
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net_connect (netstore * ns, int sok4, int sok6, int *sok_return)
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{
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*sok_return = sok4;
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return connect (sok4, (struct sockaddr *) &ns->addr, sizeof (ns->addr));
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}
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void
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net_bind (netstore * tobindto, int sok4, int sok6)
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{
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bind (sok4, (struct sockaddr *) &tobindto->addr, sizeof (tobindto->addr));
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}
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void
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net_sockets (int *sok4, int *sok6)
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{
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*sok4 = socket (AF_INET, SOCK_STREAM, 0);
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*sok6 = -1;
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net_set_socket_options (*sok4);
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}
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void
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udp_sockets (int *sok4, int *sok6)
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{
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*sok4 = socket (AF_INET, SOCK_DGRAM, 0);
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*sok6 = -1;
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}
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void
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net_store_fill_any (netstore *ns)
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{
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ns->addr.sin_family = AF_INET;
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ns->addr.sin_addr.s_addr = INADDR_ANY;
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ns->addr.sin_port = 0;
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}
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void
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net_store_fill_v4 (netstore *ns, guint32 addr, int port)
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{
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ns->addr.sin_family = AF_INET;
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ns->addr.sin_addr.s_addr = addr;
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ns->addr.sin_port = port;
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}
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guint32
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net_getsockaddr_v4 (netstore *ns)
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{
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return ns->addr.sin_addr.s_addr;
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}
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int
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net_getsockport (int sok4, int sok6)
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{
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struct sockaddr_in addr;
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int len = sizeof (addr);
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if (getsockname (sok4, (struct sockaddr *)&addr, &len) == -1)
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return -1;
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return addr.sin_port;
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}
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#else
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/* =================== IPV6 ================== */
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char *
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net_resolve (netstore * ns, char *hostname, int port, char **real_host)
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{
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struct addrinfo hints;
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char ipstring[MAX_HOSTNAME];
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char portstring[MAX_HOSTNAME];
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int ret;
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/* if (ns->ip6_hostent)
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freeaddrinfo (ns->ip6_hostent);*/
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sprintf (portstring, "%d", port);
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memset (&hints, 0, sizeof (struct addrinfo));
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hints.ai_family = PF_UNSPEC; /* support ipv6 and ipv4 */
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hints.ai_flags = AI_CANONNAME;
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hints.ai_socktype = SOCK_STREAM;
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if (port == 0)
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ret = getaddrinfo (hostname, NULL, &hints, &ns->ip6_hostent);
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else
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ret = getaddrinfo (hostname, portstring, &hints, &ns->ip6_hostent);
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if (ret != 0)
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return NULL;
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#ifdef LOOKUPD /* See note about lookupd above the IPv4 version of net_resolve. */
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struct addrinfo *tmp;
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int count = 0;
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for (tmp = ns->ip6_hostent; tmp; tmp = tmp->ai_next)
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count ++;
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count = RAND_INT(count);
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while (count--) ns->ip6_hostent = ns->ip6_hostent->ai_next;
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#endif
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/* find the numeric IP number */
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ipstring[0] = 0;
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getnameinfo (ns->ip6_hostent->ai_addr, ns->ip6_hostent->ai_addrlen,
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ipstring, sizeof (ipstring), NULL, 0, NI_NUMERICHOST);
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if (ns->ip6_hostent->ai_canonname)
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*real_host = strdup (ns->ip6_hostent->ai_canonname);
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else
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*real_host = strdup (hostname);
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return strdup (ipstring);
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}
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/* the only thing making this interface unclean, this shitty sok4, sok6 business */
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int
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net_connect (netstore * ns, int sok4, int sok6, int *sok_return)
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{
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struct addrinfo *res, *res0;
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int error = -1;
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res0 = ns->ip6_hostent;
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for (res = res0; res; res = res->ai_next)
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{
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/* sok = socket (res->ai_family, res->ai_socktype, res->ai_protocol);
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if (sok < 0)
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continue;*/
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switch (res->ai_family)
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{
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case AF_INET:
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error = connect (sok4, res->ai_addr, res->ai_addrlen);
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*sok_return = sok4;
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break;
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case AF_INET6:
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error = connect (sok6, res->ai_addr, res->ai_addrlen);
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*sok_return = sok6;
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break;
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default:
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error = 1;
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}
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if (error == 0)
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break;
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}
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return error;
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}
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void
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net_bind (netstore * tobindto, int sok4, int sok6)
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{
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bind (sok4, tobindto->ip6_hostent->ai_addr,
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tobindto->ip6_hostent->ai_addrlen);
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bind (sok6, tobindto->ip6_hostent->ai_addr,
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tobindto->ip6_hostent->ai_addrlen);
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}
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void
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net_sockets (int *sok4, int *sok6)
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{
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*sok4 = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
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*sok6 = socket (AF_INET6, SOCK_STREAM, IPPROTO_TCP);
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net_set_socket_options (*sok4);
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net_set_socket_options (*sok6);
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}
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void
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udp_sockets (int *sok4, int *sok6)
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{
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*sok4 = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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*sok6 = socket (AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
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}
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/* the following functions are used only by MSPROXY and are not
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proper ipv6 implementations - do not use in new code! */
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void
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net_store_fill_any (netstore *ns)
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{
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struct addrinfo *ai;
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struct sockaddr_in *sin;
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ai = ns->ip6_hostent;
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if (!ai) {
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ai = malloc (sizeof (struct addrinfo));
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memset (ai, 0, sizeof (struct addrinfo));
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ns->ip6_hostent = ai;
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}
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sin = (struct sockaddr_in *)ai->ai_addr;
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if (!sin) {
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sin = malloc (sizeof (struct sockaddr_in));
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memset (sin, 0, sizeof (struct sockaddr_in));
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ai->ai_addr = (struct sockaddr *)sin;
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}
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ai->ai_family = AF_INET;
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ai->ai_addrlen = sizeof(struct sockaddr_in);
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = INADDR_ANY;
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sin->sin_port = 0;
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ai->ai_next = NULL;
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}
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void
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net_store_fill_v4 (netstore *ns, guint32 addr, int port)
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{
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struct addrinfo *ai;
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struct sockaddr_in *sin;
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ai = ns->ip6_hostent;
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if (!ai) {
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ai = malloc (sizeof (struct addrinfo));
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memset (ai, 0, sizeof (struct addrinfo));
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ns->ip6_hostent = ai;
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}
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sin = (struct sockaddr_in *)ai->ai_addr;
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if (!sin) {
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sin = malloc (sizeof (struct sockaddr_in));
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memset (sin, 0, sizeof (struct sockaddr_in));
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ai->ai_addr = (struct sockaddr *)sin;
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}
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ai->ai_family = AF_INET;
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ai->ai_addrlen = sizeof(struct sockaddr_in);
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = addr;
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sin->sin_port = port;
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ai->ai_next = NULL;
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}
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guint32
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net_getsockaddr_v4 (netstore *ns)
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{
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struct addrinfo *ai;
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struct sockaddr_in *sin;
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ai = ns->ip6_hostent;
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while (ai->ai_family != AF_INET) {
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ai = ai->ai_next;
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if (!ai)
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return 0;
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}
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sin = (struct sockaddr_in *)ai->ai_addr;
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return sin->sin_addr.s_addr;
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}
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int
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net_getsockport (int sok4, int sok6)
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{
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struct sockaddr_in addr;
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int len = sizeof (addr);
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if (getsockname (sok4, (struct sockaddr *)&addr, &len) == -1)
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return -1;
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return addr.sin_port;
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}
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#endif
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