masqmail-0.2

annotate src/connect.c @ 0:08114f7dcc23

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this is masqmail-0.2.21 from oliver kurth
author meillo@marmaro.de
date Fri, 26 Sep 2008 17:05:23 +0200
parents
children 26e34ae9a3e3
rev   line source
meillo@0 1 /* MasqMail
meillo@0 2 Copyright (C) 1999 Oliver Kurth
meillo@0 3
meillo@0 4 This program is free software; you can redistribute it and/or modify
meillo@0 5 it under the terms of the GNU General Public License as published by
meillo@0 6 the Free Software Foundation; either version 2 of the License, or
meillo@0 7 (at your option) any later version.
meillo@0 8
meillo@0 9 This program is distributed in the hope that it will be useful,
meillo@0 10 but WITHOUT ANY WARRANTY; without even the implied warranty of
meillo@0 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
meillo@0 12 GNU General Public License for more details.
meillo@0 13
meillo@0 14 You should have received a copy of the GNU General Public License
meillo@0 15 along with this program; if not, write to the Free Software
meillo@0 16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
meillo@0 17 */
meillo@0 18 #include "masqmail.h"
meillo@0 19
meillo@0 20 static
meillo@0 21 GList *resolve_ip(GList *list, gchar *ip)
meillo@0 22 {
meillo@0 23 struct in_addr ia;
meillo@0 24 if(inet_aton(ip, &ia)){
meillo@0 25 mxip_addr mxip;
meillo@0 26
meillo@0 27 mxip.name = g_strdup(ip);
meillo@0 28 mxip.pref = 0;
meillo@0 29 mxip.ip = (guint32) *(guint32 *)(&ia);
meillo@0 30 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
meillo@0 31 }
meillo@0 32 /* logwrite(LOG_ALERT, "invalid address '%s': inet_aton() failed\n", ip);*/
meillo@0 33 return NULL;
meillo@0 34 }
meillo@0 35
meillo@0 36 mxip_addr *connect_hostlist(int *psockfd, gchar *host, guint port,
meillo@0 37 GList *addr_list)
meillo@0 38 {
meillo@0 39 GList *addr_node;
meillo@0 40 struct sockaddr_in saddr;
meillo@0 41
meillo@0 42 DEBUG(5) debugf("connect_hostlist entered\n");
meillo@0 43
meillo@0 44 for(addr_node = g_list_first(addr_list);
meillo@0 45 addr_node;
meillo@0 46 addr_node = g_list_next(addr_node)){
meillo@0 47 mxip_addr *addr = (mxip_addr *)(addr_node->data);
meillo@0 48
meillo@0 49 *psockfd = socket(PF_INET, SOCK_STREAM, 0);
meillo@0 50
meillo@0 51 memset(&saddr, 0, sizeof(saddr));
meillo@0 52
meillo@0 53 saddr.sin_family = AF_INET;
meillo@0 54 saddr.sin_port = htons(port);
meillo@0 55
meillo@0 56 /* clumsy, but makes compiler happy: */
meillo@0 57 saddr.sin_addr = *(struct in_addr*)(&(addr->ip));
meillo@0 58 DEBUG(5) debugf("trying ip %s port %d\n", inet_ntoa(saddr.sin_addr), port);
meillo@0 59 if(connect(*psockfd, (struct sockaddr *)(&saddr), sizeof(saddr)) == 0){
meillo@0 60 DEBUG(5) debugf("connected to %s\n", inet_ntoa(saddr.sin_addr));
meillo@0 61 return addr;
meillo@0 62 }else{
meillo@0 63 int saved_errno = errno;
meillo@0 64
meillo@0 65 close(*psockfd);
meillo@0 66
meillo@0 67 logwrite(LOG_WARNING, "connection to %s failed: %s\n",
meillo@0 68 inet_ntoa(saddr.sin_addr), strerror(errno));
meillo@0 69
meillo@0 70 errno = saved_errno;
meillo@0 71
meillo@0 72 if((saved_errno != ECONNREFUSED) &&
meillo@0 73 (saved_errno != ETIMEDOUT) &&
meillo@0 74 (saved_errno != ENETUNREACH) &&
meillo@0 75 (saved_errno != EHOSTUNREACH))
meillo@0 76
meillo@0 77 return NULL;
meillo@0 78 }
meillo@0 79 }
meillo@0 80 return NULL;
meillo@0 81 }
meillo@0 82
meillo@0 83 /* Given a list of resolver functions, this function
meillo@0 84 resolve the host and tries to connect to the addresses
meillo@0 85 returned. If a connection attemp is timed out or refused,
meillo@0 86 the next address is tried.
meillo@0 87
meillo@0 88 TODO: the resolver functions might return duplicate addresses,
meillo@0 89 if attempt failed for one it should not be tried again.
meillo@0 90 */
meillo@0 91
meillo@0 92 mxip_addr *connect_resolvelist(int *psockfd, gchar *host, guint port,
meillo@0 93 GList *res_func_list)
meillo@0 94 {
meillo@0 95 GList *res_node;
meillo@0 96 GList *addr_list;
meillo@0 97
meillo@0 98 DEBUG(5) debugf("connect_resolvelist entered\n");
meillo@0 99
meillo@0 100 h_errno = 0;
meillo@0 101
meillo@0 102 if(isdigit(host[0])){
meillo@0 103 mxip_addr *addr;
meillo@0 104
meillo@0 105 addr_list = resolve_ip(NULL, host);
meillo@0 106 if(addr_list){
meillo@0 107 addr = connect_hostlist(psockfd, host, port, addr_list);
meillo@0 108 g_list_free(addr_list);
meillo@0 109 return addr;
meillo@0 110 }
meillo@0 111 /* previous versions complained, until someone tried to use a hostname
meillo@0 112 out there that begins with a digit. eg. '3dwars.de'. */
meillo@0 113 }
meillo@0 114
meillo@0 115 if(res_func_list == NULL){
meillo@0 116 logwrite(LOG_ALERT, "res_funcs == NULL !!!\n");
meillo@0 117 exit(EXIT_FAILURE);
meillo@0 118 }
meillo@0 119
meillo@0 120 foreach(res_func_list, res_node){
meillo@0 121 resolve_func res_func;
meillo@0 122 DEBUG(6) debugf("connect_resolvelist 1a\n");
meillo@0 123 res_func = (resolve_func)(res_node->data);
meillo@0 124
meillo@0 125 if(res_func == NULL){
meillo@0 126 logwrite(LOG_ALERT, "res_func == NULL !!!\n");
meillo@0 127 exit(EXIT_FAILURE);
meillo@0 128 }
meillo@0 129
meillo@0 130 errno = 0;
meillo@0 131 if((addr_list = res_func(NULL, host))){
meillo@0 132
meillo@0 133 mxip_addr *addr;
meillo@0 134 if((addr = connect_hostlist(psockfd, host, port, addr_list)))
meillo@0 135 return addr;
meillo@0 136
meillo@0 137 DEBUG(5){
meillo@0 138 debugf("connect_hostlist failed: %s\n", strerror(errno));
meillo@0 139 }
meillo@0 140
meillo@0 141 g_list_free(addr_list);
meillo@0 142 }else{
meillo@0 143 if(!g_list_next(res_node)){
meillo@0 144 logwrite(LOG_ALERT, "could not resolve %s: %s\n", host, hstrerror(h_errno));
meillo@0 145 }
meillo@0 146 }
meillo@0 147 }
meillo@0 148 return NULL;
meillo@0 149
meillo@0 150 }
meillo@0 151