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annotate src/connect.c @ 0:08114f7dcc23 0.2.21

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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
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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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
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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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
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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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
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21 GList *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 *connect_hostlist(int *psockfd, gchar *host, guint port,
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37 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);
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45 addr_node;
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46 addr_node = g_list_next(addr_node)){
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47 mxip_addr *addr = (mxip_addr *)(addr_node->data);
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48
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49 *psockfd = socket(PF_INET, SOCK_STREAM, 0);
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50
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51 memset(&saddr, 0, sizeof(saddr));
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52
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53 saddr.sin_family = AF_INET;
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54 saddr.sin_port = htons(port);
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55
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56 /* clumsy, but makes compiler happy: */
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57 saddr.sin_addr = *(struct in_addr*)(&(addr->ip));
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58 DEBUG(5) debugf("trying ip %s port %d\n", inet_ntoa(saddr.sin_addr), port);
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59 if(connect(*psockfd, (struct sockaddr *)(&saddr), sizeof(saddr)) == 0){
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60 DEBUG(5) debugf("connected to %s\n", inet_ntoa(saddr.sin_addr));
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61 return addr;
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62 }else{
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63 int saved_errno = errno;
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64
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65 close(*psockfd);
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66
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67 logwrite(LOG_WARNING, "connection to %s failed: %s\n",
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68 inet_ntoa(saddr.sin_addr), strerror(errno));
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69
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70 errno = saved_errno;
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71
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72 if((saved_errno != ECONNREFUSED) &&
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73 (saved_errno != ETIMEDOUT) &&
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74 (saved_errno != ENETUNREACH) &&
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75 (saved_errno != EHOSTUNREACH))
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76
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77 return NULL;
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78 }
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79 }
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80 return NULL;
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81 }
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82
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83 /* Given a list of resolver functions, this function
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84 resolve the host and tries to connect to the addresses
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85 returned. If a connection attemp is timed out or refused,
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86 the next address is tried.
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87
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88 TODO: the resolver functions might return duplicate addresses,
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89 if attempt failed for one it should not be tried again.
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90 */
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91
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92 mxip_addr *connect_resolvelist(int *psockfd, gchar *host, guint port,
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93 GList *res_func_list)
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94 {
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95 GList *res_node;
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96 GList *addr_list;
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97
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98 DEBUG(5) debugf("connect_resolvelist entered\n");
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99
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100 h_errno = 0;
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101
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102 if(isdigit(host[0])){
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103 mxip_addr *addr;
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104
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105 addr_list = resolve_ip(NULL, host);
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106 if(addr_list){
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107 addr = connect_hostlist(psockfd, host, port, addr_list);
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108 g_list_free(addr_list);
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109 return addr;
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110 }
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111 /* previous versions complained, until someone tried to use a hostname
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112 out there that begins with a digit. eg. '3dwars.de'. */
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113 }
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114
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115 if(res_func_list == NULL){
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116 logwrite(LOG_ALERT, "res_funcs == NULL !!!\n");
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117 exit(EXIT_FAILURE);
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118 }
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119
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120 foreach(res_func_list, res_node){
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121 resolve_func res_func;
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122 DEBUG(6) debugf("connect_resolvelist 1a\n");
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123 res_func = (resolve_func)(res_node->data);
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124
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125 if(res_func == NULL){
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126 logwrite(LOG_ALERT, "res_func == NULL !!!\n");
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127 exit(EXIT_FAILURE);
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128 }
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129
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130 errno = 0;
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131 if((addr_list = res_func(NULL, host))){
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132
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133 mxip_addr *addr;
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134 if((addr = connect_hostlist(psockfd, host, port, addr_list)))
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135 return addr;
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136
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137 DEBUG(5){
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138 debugf("connect_hostlist failed: %s\n", strerror(errno));
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139 }
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140
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141 g_list_free(addr_list);
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142 }else{
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143 if(!g_list_next(res_node)){
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144 logwrite(LOG_ALERT, "could not resolve %s: %s\n", host, hstrerror(h_errno));
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145 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
146 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
147 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
148 return NULL;
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
149
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
150 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
151