meillo@0: /*  MasqMail
meillo@0:     Copyright (C) 1999 Oliver Kurth
meillo@0: 
meillo@0:     This program is free software; you can redistribute it and/or modify
meillo@0:     it under the terms of the GNU General Public License as published by
meillo@0:     the Free Software Foundation; either version 2 of the License, or
meillo@0:     (at your option) any later version.
meillo@0: 
meillo@0:     This program is distributed in the hope that it will be useful,
meillo@0:     but WITHOUT ANY WARRANTY; without even the implied warranty of
meillo@0:     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
meillo@0:     GNU General Public License for more details.
meillo@0: 
meillo@0:     You should have received a copy of the GNU General Public License
meillo@0:     along with this program; if not, write to the Free Software
meillo@0:     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
meillo@0: */
meillo@0: #include "masqmail.h"
meillo@0: 
meillo@10: static GList*
meillo@10: resolve_ip(GList * list, gchar * ip)
meillo@0: {
meillo@10: 	struct in_addr ia;
meillo@10: 	if (inet_aton(ip, &ia)) {
meillo@10: 		mxip_addr mxip;
meillo@10: 
meillo@10: 		mxip.name = g_strdup(ip);
meillo@10: 		mxip.pref = 0;
meillo@10: 		mxip.ip = (guint32) * (guint32 *) (&ia);
meillo@10: 		list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
meillo@10: 	}
meillo@10: 	/* logwrite(LOG_ALERT, "invalid address '%s': inet_aton() failed\n", ip); */
meillo@10: 	return NULL;
meillo@0: }
meillo@0: 
meillo@10: mxip_addr*
meillo@10: connect_hostlist(int *psockfd, gchar * host, guint port, GList * addr_list)
meillo@0: {
meillo@10: 	GList *addr_node;
meillo@10: 	struct sockaddr_in saddr;
meillo@0: 
meillo@10: 	DEBUG(5) debugf("connect_hostlist entered\n");
meillo@0: 
meillo@10: 	for (addr_node = g_list_first(addr_list); addr_node; addr_node = g_list_next(addr_node)) {
meillo@10: 		mxip_addr *addr = (mxip_addr *) (addr_node->data);
meillo@0: 
meillo@10: 		*psockfd = socket(PF_INET, SOCK_STREAM, 0);
meillo@0: 
meillo@10: 		memset(&saddr, 0, sizeof(saddr));
meillo@0: 
meillo@10: 		saddr.sin_family = AF_INET;
meillo@10: 		saddr.sin_port = htons(port);
meillo@0: 
meillo@10: 		/* clumsy, but makes compiler happy: */
meillo@10: 		saddr.sin_addr = *(struct in_addr *) (&(addr->ip));
meillo@10: 		DEBUG(5) debugf("trying ip %s port %d\n", inet_ntoa(saddr.sin_addr), port);
meillo@10: 		if (connect(*psockfd, (struct sockaddr *) (&saddr), sizeof(saddr)) == 0) {
meillo@10: 			DEBUG(5) debugf("connected to %s\n", inet_ntoa(saddr.sin_addr));
meillo@10: 			return addr;
meillo@10: 		} else {
meillo@10: 			int saved_errno = errno;
meillo@0: 
meillo@10: 			close(*psockfd);
meillo@0: 
meillo@10: 			logwrite(LOG_WARNING, "connection to %s failed: %s\n", inet_ntoa(saddr.sin_addr), strerror(errno));
meillo@0: 
meillo@10: 			errno = saved_errno;
meillo@0: 
meillo@10: 			if ((saved_errno != ECONNREFUSED)
meillo@10: 			    && (saved_errno != ETIMEDOUT)
meillo@10: 			    && (saved_errno != ENETUNREACH)
meillo@10: 			    && (saved_errno != EHOSTUNREACH))
meillo@10: 				return NULL;
meillo@10: 		}
meillo@10: 	}
meillo@0: 	return NULL;
meillo@0: }
meillo@0: 
meillo@0: /* Given a list of resolver functions, this function
meillo@0:    resolve the host and tries to connect to the addresses
meillo@0:    returned. If a connection attemp is timed out or refused,
meillo@0:    the next address is tried.
meillo@0: 
meillo@0:    TODO: the resolver functions might return duplicate addresses,
meillo@0:    if attempt failed for one it should not be tried again.
meillo@0: */
meillo@0: 
meillo@10: mxip_addr*
meillo@10: connect_resolvelist(int *psockfd, gchar * host, guint port, GList * res_func_list)
meillo@0: {
meillo@10: 	GList *res_node;
meillo@10: 	GList *addr_list;
meillo@0: 
meillo@10: 	DEBUG(5) debugf("connect_resolvelist entered\n");
meillo@0: 
meillo@10: 	h_errno = 0;
meillo@0: 
meillo@10: 	if (isdigit(host[0])) {
meillo@10: 		mxip_addr *addr;
meillo@0: 
meillo@10: 		addr_list = resolve_ip(NULL, host);
meillo@10: 		if (addr_list) {
meillo@10: 			addr = connect_hostlist(psockfd, host, port, addr_list);
meillo@10: 			g_list_free(addr_list);
meillo@10: 			return addr;
meillo@10: 		}
meillo@10: 		/* previous versions complained, until someone tried to use a hostname
meillo@10: 		   out there that begins with a digit. eg. '3dwars.de'. */
meillo@10: 	}
meillo@0: 
meillo@10: 	if (res_func_list == NULL) {
meillo@10: 		logwrite(LOG_ALERT, "res_funcs == NULL !!!\n");
meillo@10: 		exit(EXIT_FAILURE);
meillo@10: 	}
meillo@0: 
meillo@10: 	foreach(res_func_list, res_node) {
meillo@10: 		resolve_func res_func;
meillo@10: 		DEBUG(6) debugf("connect_resolvelist 1a\n");
meillo@10: 		res_func = (resolve_func) (res_node->data);
meillo@10: 
meillo@10: 		if (res_func == NULL) {
meillo@10: 			logwrite(LOG_ALERT, "res_func == NULL !!!\n");
meillo@10: 			exit(EXIT_FAILURE);
meillo@10: 		}
meillo@10: 
meillo@10: 		errno = 0;
meillo@10: 		if ((addr_list = res_func(NULL, host))) {
meillo@10: 
meillo@10: 			mxip_addr *addr;
meillo@10: 			if ((addr = connect_hostlist(psockfd, host, port, addr_list)))
meillo@10: 				return addr;
meillo@10: 
meillo@10: 			DEBUG(5) {
meillo@10: 				debugf("connect_hostlist failed: %s\n", strerror(errno));
meillo@10: 			}
meillo@10: 
meillo@10: 			g_list_free(addr_list);
meillo@10: 		} else {
meillo@10: 			if (!g_list_next(res_node)) {
meillo@10: 				logwrite(LOG_ALERT, "could not resolve %s: %s\n", host, hstrerror(h_errno));
meillo@10: 			}
meillo@10: 		}
meillo@10: 	}
meillo@10: 	return NULL;
meillo@0: 
meillo@0: }