masqmail

annotate src/connect.c @ 410:cff967b2f51e

find changesets by author, revision, files, or words in the commit message
Minor comment rework.
author markus schnalke <meillo@marmaro.de>
date Wed, 29 Feb 2012 12:05:47 +0100
parents 6500db550a03
children
rev   line source
meillo@367 1 /*
meillo@367 2 ** MasqMail
meillo@367 3 ** Copyright (C) 1999 Oliver Kurth
meillo@367 4 **
meillo@367 5 ** This program is free software; you can redistribute it and/or modify
meillo@367 6 ** it under the terms of the GNU General Public License as published by
meillo@367 7 ** the Free Software Foundation; either version 2 of the License, or
meillo@367 8 ** (at your option) any later version.
meillo@367 9 **
meillo@367 10 ** This program is distributed in the hope that it will be useful,
meillo@367 11 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
meillo@367 12 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
meillo@367 13 ** GNU General Public License for more details.
meillo@367 14 **
meillo@367 15 ** You should have received a copy of the GNU General Public License
meillo@367 16 ** along with this program; if not, write to the Free Software
meillo@367 17 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
meillo@0 18 */
meillo@0 19 #include "masqmail.h"
meillo@0 20
meillo@10 21 static GList*
meillo@400 22 resolve_ip(gchar *ip)
meillo@0 23 {
meillo@10 24 struct in_addr ia;
meillo@400 25 mxip_addr mxip;
meillo@10 26
meillo@400 27 if (!inet_aton(ip, &ia)) {
meillo@400 28 /* No dots-and-numbers notation. */
meillo@400 29 return NULL;
meillo@10 30 }
meillo@400 31 mxip.name = g_strdup(ip);
meillo@400 32 mxip.pref = 0;
meillo@400 33 mxip.ip = (guint32) * (guint32 *) (&ia);
meillo@400 34 return g_list_append(NULL, g_memdup(&mxip, sizeof(mxip)));
meillo@0 35 }
meillo@0 36
meillo@10 37 mxip_addr*
meillo@366 38 connect_hostlist(int *psockfd, gchar *host, guint port, GList *addr_list)
meillo@0 39 {
meillo@10 40 GList *addr_node;
meillo@10 41 struct sockaddr_in saddr;
meillo@401 42 int saved_errno;
meillo@0 43
meillo@10 44 DEBUG(5) debugf("connect_hostlist entered\n");
meillo@0 45
meillo@401 46 for (addr_node = g_list_first(addr_list); addr_node;
meillo@401 47 addr_node = g_list_next(addr_node)) {
meillo@10 48 mxip_addr *addr = (mxip_addr *) (addr_node->data);
meillo@10 49 *psockfd = socket(PF_INET, SOCK_STREAM, 0);
meillo@0 50
meillo@10 51 memset(&saddr, 0, sizeof(saddr));
meillo@10 52 saddr.sin_family = AF_INET;
meillo@10 53 saddr.sin_port = htons(port);
meillo@10 54 /* clumsy, but makes compiler happy: */
meillo@10 55 saddr.sin_addr = *(struct in_addr *) (&(addr->ip));
meillo@401 56
meillo@401 57 DEBUG(5) debugf(" trying ip %s port %d\n",
meillo@401 58 inet_ntoa(saddr.sin_addr), port);
meillo@401 59
meillo@401 60 if (connect(*psockfd, (struct sockaddr *) &saddr,
meillo@401 61 sizeof(saddr))==0) {
meillo@401 62 DEBUG(5) debugf(" connected to %s\n",
meillo@401 63 inet_ntoa(saddr.sin_addr));
meillo@10 64 return addr;
meillo@401 65 }
meillo@0 66
meillo@401 67 saved_errno = errno;
meillo@401 68 close(*psockfd);
meillo@401 69 logwrite(LOG_WARNING, "connection to %s failed: %s\n",
meillo@401 70 inet_ntoa(saddr.sin_addr), strerror(errno));
meillo@401 71 errno = saved_errno;
meillo@0 72
meillo@401 73 if ((saved_errno != ECONNREFUSED) &&
meillo@401 74 (saved_errno != ETIMEDOUT) &&
meillo@401 75 (saved_errno != ENETUNREACH) &&
meillo@401 76 (saved_errno != EHOSTUNREACH)) {
meillo@401 77 return NULL;
meillo@10 78 }
meillo@10 79 }
meillo@0 80 return NULL;
meillo@0 81 }
meillo@0 82
meillo@367 83 /*
meillo@367 84 ** Given a list of resolver functions, this function
meillo@367 85 ** resolve the host and tries to connect to the addresses
meillo@367 86 ** returned. If a connection attemp is timed out or refused,
meillo@367 87 ** the next address is tried.
meillo@367 88 **
meillo@367 89 ** TODO: the resolver functions might return duplicate addresses,
meillo@367 90 ** if attempt failed for one it should not be tried again.
meillo@0 91 */
meillo@10 92 mxip_addr*
meillo@401 93 connect_resolvelist(int *psockfd, gchar *host, guint port,
meillo@401 94 GList *res_func_list)
meillo@0 95 {
meillo@10 96 GList *res_node;
meillo@10 97 GList *addr_list;
meillo@0 98
meillo@10 99 DEBUG(5) debugf("connect_resolvelist entered\n");
meillo@0 100
meillo@10 101 h_errno = 0;
meillo@400 102 if (isdigit(*host)) {
meillo@10 103 mxip_addr *addr;
meillo@0 104
meillo@400 105 if ((addr_list = resolve_ip(host))) {
meillo@401 106 addr = connect_hostlist(psockfd, host, port,
meillo@401 107 addr_list);
meillo@10 108 g_list_free(addr_list);
meillo@10 109 return addr;
meillo@10 110 }
meillo@367 111 /*
meillo@400 112 ** Probably a hostname that begins with a digit.
meillo@400 113 ** E.g. '3dwars.de'. Thus fall ...
meillo@367 114 */
meillo@10 115 }
meillo@0 116
meillo@401 117 if (!res_func_list) {
meillo@401 118 logwrite(LOG_ALERT, "res_funcs not set!\n");
meillo@262 119 exit(1);
meillo@10 120 }
meillo@0 121
meillo@10 122 foreach(res_func_list, res_node) {
meillo@10 123 resolve_func res_func;
meillo@114 124 DEBUG(6) debugf(" foreach() body\n");
meillo@10 125
meillo@401 126 res_func = (resolve_func) res_node->data;
meillo@401 127 if (!res_func) {
meillo@401 128 logwrite(LOG_ALERT, "Empty res_func!\n");
meillo@262 129 exit(1);
meillo@10 130 }
meillo@10 131
meillo@10 132 errno = 0;
meillo@10 133 if ((addr_list = res_func(NULL, host))) {
meillo@10 134
meillo@10 135 mxip_addr *addr;
meillo@401 136 if ((addr = connect_hostlist(psockfd, host, port,
meillo@401 137 addr_list))) {
meillo@10 138 return addr;
meillo@10 139 }
meillo@401 140 DEBUG(5) debugf("connect_hostlist failed: %s\n",
meillo@401 141 strerror(errno));
meillo@10 142 g_list_free(addr_list);
meillo@369 143 } else if (!g_list_next(res_node)) {
meillo@401 144 logwrite(LOG_ALERT, "could not resolve %s: %s\n",
meillo@401 145 host, hstrerror(h_errno));
meillo@10 146 }
meillo@10 147 }
meillo@10 148 return NULL;
meillo@0 149
meillo@0 150 }