masqmail

annotate src/connect.c @ 281:ea5f86e0a81c

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modes are now enforced exclusive Other MTAs (exim, postfix) are more relaxing, but as combinations of exclusive modes are senseless we behave more obvious if we fail early. This makes understanding the behavior easier too.
author markus schnalke <meillo@marmaro.de>
date Tue, 07 Dec 2010 14:04:56 -0300
parents a80ebfa16cd5
children 41958685480d
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@10 20 static GList*
meillo@10 21 resolve_ip(GList * list, gchar * ip)
meillo@0 22 {
meillo@10 23 struct in_addr ia;
meillo@10 24 if (inet_aton(ip, &ia)) {
meillo@10 25 mxip_addr mxip;
meillo@10 26
meillo@10 27 mxip.name = g_strdup(ip);
meillo@10 28 mxip.pref = 0;
meillo@10 29 mxip.ip = (guint32) * (guint32 *) (&ia);
meillo@10 30 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
meillo@10 31 }
meillo@10 32 /* logwrite(LOG_ALERT, "invalid address '%s': inet_aton() failed\n", ip); */
meillo@10 33 return NULL;
meillo@0 34 }
meillo@0 35
meillo@10 36 mxip_addr*
meillo@10 37 connect_hostlist(int *psockfd, gchar * host, guint port, GList * addr_list)
meillo@0 38 {
meillo@10 39 GList *addr_node;
meillo@10 40 struct sockaddr_in saddr;
meillo@0 41
meillo@10 42 DEBUG(5) debugf("connect_hostlist entered\n");
meillo@0 43
meillo@10 44 for (addr_node = g_list_first(addr_list); addr_node; addr_node = g_list_next(addr_node)) {
meillo@10 45 mxip_addr *addr = (mxip_addr *) (addr_node->data);
meillo@0 46
meillo@10 47 *psockfd = socket(PF_INET, SOCK_STREAM, 0);
meillo@0 48
meillo@10 49 memset(&saddr, 0, sizeof(saddr));
meillo@0 50
meillo@10 51 saddr.sin_family = AF_INET;
meillo@10 52 saddr.sin_port = htons(port);
meillo@0 53
meillo@10 54 /* clumsy, but makes compiler happy: */
meillo@10 55 saddr.sin_addr = *(struct in_addr *) (&(addr->ip));
meillo@114 56 DEBUG(5) debugf(" trying ip %s port %d\n", inet_ntoa(saddr.sin_addr), port);
meillo@10 57 if (connect(*psockfd, (struct sockaddr *) (&saddr), sizeof(saddr)) == 0) {
meillo@114 58 DEBUG(5) debugf(" connected to %s\n", inet_ntoa(saddr.sin_addr));
meillo@10 59 return addr;
meillo@10 60 } else {
meillo@10 61 int saved_errno = errno;
meillo@0 62
meillo@10 63 close(*psockfd);
meillo@0 64
meillo@10 65 logwrite(LOG_WARNING, "connection to %s failed: %s\n", inet_ntoa(saddr.sin_addr), strerror(errno));
meillo@0 66
meillo@10 67 errno = saved_errno;
meillo@0 68
meillo@10 69 if ((saved_errno != ECONNREFUSED)
meillo@10 70 && (saved_errno != ETIMEDOUT)
meillo@10 71 && (saved_errno != ENETUNREACH)
meillo@10 72 && (saved_errno != EHOSTUNREACH))
meillo@10 73 return NULL;
meillo@10 74 }
meillo@10 75 }
meillo@0 76 return NULL;
meillo@0 77 }
meillo@0 78
meillo@0 79 /* Given a list of resolver functions, this function
meillo@0 80 resolve the host and tries to connect to the addresses
meillo@0 81 returned. If a connection attemp is timed out or refused,
meillo@0 82 the next address is tried.
meillo@0 83
meillo@0 84 TODO: the resolver functions might return duplicate addresses,
meillo@0 85 if attempt failed for one it should not be tried again.
meillo@0 86 */
meillo@0 87
meillo@10 88 mxip_addr*
meillo@10 89 connect_resolvelist(int *psockfd, gchar * host, guint port, GList * res_func_list)
meillo@0 90 {
meillo@10 91 GList *res_node;
meillo@10 92 GList *addr_list;
meillo@0 93
meillo@10 94 DEBUG(5) debugf("connect_resolvelist entered\n");
meillo@0 95
meillo@10 96 h_errno = 0;
meillo@0 97
meillo@10 98 if (isdigit(host[0])) {
meillo@10 99 mxip_addr *addr;
meillo@0 100
meillo@10 101 addr_list = resolve_ip(NULL, host);
meillo@10 102 if (addr_list) {
meillo@10 103 addr = connect_hostlist(psockfd, host, port, addr_list);
meillo@10 104 g_list_free(addr_list);
meillo@10 105 return addr;
meillo@10 106 }
meillo@10 107 /* previous versions complained, until someone tried to use a hostname
meillo@10 108 out there that begins with a digit. eg. '3dwars.de'. */
meillo@10 109 }
meillo@0 110
meillo@10 111 if (res_func_list == NULL) {
meillo@10 112 logwrite(LOG_ALERT, "res_funcs == NULL !!!\n");
meillo@262 113 exit(1);
meillo@10 114 }
meillo@0 115
meillo@10 116 foreach(res_func_list, res_node) {
meillo@10 117 resolve_func res_func;
meillo@114 118 DEBUG(6) debugf(" foreach() body\n");
meillo@10 119 res_func = (resolve_func) (res_node->data);
meillo@10 120
meillo@10 121 if (res_func == NULL) {
meillo@10 122 logwrite(LOG_ALERT, "res_func == NULL !!!\n");
meillo@262 123 exit(1);
meillo@10 124 }
meillo@10 125
meillo@10 126 errno = 0;
meillo@10 127 if ((addr_list = res_func(NULL, host))) {
meillo@10 128
meillo@10 129 mxip_addr *addr;
meillo@10 130 if ((addr = connect_hostlist(psockfd, host, port, addr_list)))
meillo@10 131 return addr;
meillo@10 132
meillo@10 133 DEBUG(5) {
meillo@10 134 debugf("connect_hostlist failed: %s\n", strerror(errno));
meillo@10 135 }
meillo@10 136
meillo@10 137 g_list_free(addr_list);
meillo@10 138 } else {
meillo@10 139 if (!g_list_next(res_node)) {
meillo@10 140 logwrite(LOG_ALERT, "could not resolve %s: %s\n", host, hstrerror(h_errno));
meillo@10 141 }
meillo@10 142 }
meillo@10 143 }
meillo@10 144 return NULL;
meillo@0 145
meillo@0 146 }