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annotate src/connect.c @ 291:95d536599fd7

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updated ChangeLog, NEWS and date/version in the man pages
author markus schnalke <meillo@marmaro.de>
date Wed, 08 Dec 2010 18:06:44 -0300 (2010-12-08)
parents fc1c6425c024
children 41958685480d
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1 /* MasqMail
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2 Copyright (C) 1999 Oliver Kurth
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2 of the License, or
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software
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16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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17 */
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18 #include "masqmail.h"
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19
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20 static GList*
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21 resolve_ip(GList * list, gchar * ip)
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22 {
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23 struct in_addr ia;
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24 if (inet_aton(ip, &ia)) {
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25 mxip_addr mxip;
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26
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27 mxip.name = g_strdup(ip);
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28 mxip.pref = 0;
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29 mxip.ip = (guint32) * (guint32 *) (&ia);
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30 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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31 }
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32 /* logwrite(LOG_ALERT, "invalid address '%s': inet_aton() failed\n", ip); */
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33 return NULL;
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34 }
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35
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36 mxip_addr*
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37 connect_hostlist(int *psockfd, gchar * host, guint port, GList * addr_list)
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38 {
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39 GList *addr_node;
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40 struct sockaddr_in saddr;
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41
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42 DEBUG(5) debugf("connect_hostlist entered\n");
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43
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44 for (addr_node = g_list_first(addr_list); addr_node; addr_node = g_list_next(addr_node)) {
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45 mxip_addr *addr = (mxip_addr *) (addr_node->data);
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46
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47 *psockfd = socket(PF_INET, SOCK_STREAM, 0);
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48
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49 memset(&saddr, 0, sizeof(saddr));
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50
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51 saddr.sin_family = AF_INET;
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52 saddr.sin_port = htons(port);
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53
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54 /* clumsy, but makes compiler happy: */
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55 saddr.sin_addr = *(struct in_addr *) (&(addr->ip));
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56 DEBUG(5) debugf(" trying ip %s port %d\n", inet_ntoa(saddr.sin_addr), port);
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57 if (connect(*psockfd, (struct sockaddr *) (&saddr), sizeof(saddr)) == 0) {
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58 DEBUG(5) debugf(" connected to %s\n", inet_ntoa(saddr.sin_addr));
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59 return addr;
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60 } else {
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61 int saved_errno = errno;
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62
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63 close(*psockfd);
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64
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65 logwrite(LOG_WARNING, "connection to %s failed: %s\n", inet_ntoa(saddr.sin_addr), strerror(errno));
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66
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67 errno = saved_errno;
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68
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69 if ((saved_errno != ECONNREFUSED)
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70 && (saved_errno != ETIMEDOUT)
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71 && (saved_errno != ENETUNREACH)
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72 && (saved_errno != EHOSTUNREACH))
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73 return NULL;
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74 }
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75 }
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76 return NULL;
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77 }
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78
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79 /* Given a list of resolver functions, this function
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80 resolve the host and tries to connect to the addresses
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81 returned. If a connection attemp is timed out or refused,
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82 the next address is tried.
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83
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84 TODO: the resolver functions might return duplicate addresses,
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85 if attempt failed for one it should not be tried again.
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86 */
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87
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88 mxip_addr*
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89 connect_resolvelist(int *psockfd, gchar * host, guint port, GList * res_func_list)
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90 {
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91 GList *res_node;
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92 GList *addr_list;
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93
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94 DEBUG(5) debugf("connect_resolvelist entered\n");
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95
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96 h_errno = 0;
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97
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98 if (isdigit(host[0])) {
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99 mxip_addr *addr;
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100
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101 addr_list = resolve_ip(NULL, host);
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102 if (addr_list) {
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103 addr = connect_hostlist(psockfd, host, port, addr_list);
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104 g_list_free(addr_list);
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105 return addr;
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106 }
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107 /* previous versions complained, until someone tried to use a hostname
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108 out there that begins with a digit. eg. '3dwars.de'. */
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109 }
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110
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111 if (res_func_list == NULL) {
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112 logwrite(LOG_ALERT, "res_funcs == NULL !!!\n");
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113 exit(1);
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114 }
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115
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116 foreach(res_func_list, res_node) {
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117 resolve_func res_func;
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118 DEBUG(6) debugf(" foreach() body\n");
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119 res_func = (resolve_func) (res_node->data);
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120
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121 if (res_func == NULL) {
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122 logwrite(LOG_ALERT, "res_func == NULL !!!\n");
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123 exit(1);
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124 }
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125
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126 errno = 0;
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127 if ((addr_list = res_func(NULL, host))) {
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128
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129 mxip_addr *addr;
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130 if ((addr = connect_hostlist(psockfd, host, port, addr_list)))
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131 return addr;
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132
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133 DEBUG(5) {
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134 debugf("connect_hostlist failed: %s\n", strerror(errno));
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135 }
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136
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137 g_list_free(addr_list);
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138 } else {
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139 if (!g_list_next(res_node)) {
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140 logwrite(LOG_ALERT, "could not resolve %s: %s\n", host, hstrerror(h_errno));
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141 }
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142 }
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143 }
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144 return NULL;
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145
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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