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annotate src/connect.c @ 434:f2a7271746d1 default tip

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Removes Freshmeat.net from the docs The site, which was later renamed to freecode.com, is no longer maintained (contains only a static copy).
author markus schnalke <meillo@marmaro.de>
date Sat, 07 Feb 2015 11:45:07 +0100
parents 885e3d886199
children
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1 /*
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2 ** MasqMail
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3 ** Copyright (C) 1999 Oliver Kurth
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4 **
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5 ** This program is free software; you can redistribute it and/or modify
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6 ** it under the terms of the GNU General Public License as published by
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7 ** the Free Software Foundation; either version 2 of the License, or
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8 ** (at your option) any later version.
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9 **
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10 ** This program is distributed in the hope that it will be useful,
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11 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 ** GNU General Public License for more details.
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14 **
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15 ** You should have received a copy of the GNU General Public License
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16 ** along with this program; if not, write to the Free Software
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17 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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18 */
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19 #include "masqmail.h"
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20
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21 static GList*
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22 resolve_ip(gchar *ip)
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23 {
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24 struct in_addr ia;
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25 mxip_addr mxip;
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26
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27 if (!inet_aton(ip, &ia)) {
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28 /* No dots-and-numbers notation. */
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29 return NULL;
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30 }
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31 mxip.name = g_strdup(ip);
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32 mxip.pref = 0;
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33 mxip.ip = (guint32) * (guint32 *) (&ia);
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34 return g_list_append(NULL, g_memdup(&mxip, sizeof(mxip)));
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35 }
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36
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37 mxip_addr*
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38 connect_hostlist(int *psockfd, gchar *host, guint port, GList *addr_list)
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39 {
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40 GList *addr_node;
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41 struct sockaddr_in saddr;
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42 int saved_errno;
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43
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44 DEBUG(5) debugf("connect_hostlist entered\n");
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45
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46 for (addr_node = g_list_first(addr_list); addr_node;
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47 addr_node = g_list_next(addr_node)) {
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48 mxip_addr *addr = (mxip_addr *) (addr_node->data);
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49 *psockfd = socket(PF_INET, SOCK_STREAM, 0);
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51 memset(&saddr, 0, sizeof(saddr));
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52 saddr.sin_family = AF_INET;
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53 saddr.sin_port = htons(port);
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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
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57 DEBUG(5) debugf(" trying ip %s port %d\n",
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58 inet_ntoa(saddr.sin_addr), port);
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59
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60 if (connect(*psockfd, (struct sockaddr *) &saddr,
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61 sizeof(saddr))==0) {
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62 DEBUG(5) debugf(" connected to %s\n",
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63 inet_ntoa(saddr.sin_addr));
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64 return addr;
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65 }
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67 saved_errno = errno;
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68 close(*psockfd);
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69 logwrite(LOG_WARNING, "connection to %s failed: %s\n",
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70 inet_ntoa(saddr.sin_addr), strerror(errno));
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71 errno = saved_errno;
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73 if ((saved_errno != ECONNREFUSED) &&
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74 (saved_errno != ETIMEDOUT) &&
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75 (saved_errno != ENETUNREACH) &&
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76 (saved_errno != EHOSTUNREACH)) {
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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 /*
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84 ** Given a list of resolver functions, this function
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85 ** resolve the host and tries to connect to the addresses
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86 ** returned. If a connection attemp is timed out or refused,
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87 ** the next address is tried.
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88 **
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89 ** TODO: the resolver functions might return duplicate addresses,
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90 ** if attempt failed for one it should not be tried again.
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91 */
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92 mxip_addr*
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93 connect_resolvelist(int *psockfd, gchar *host, guint port,
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94 GList *res_func_list)
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95 {
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96 GList *res_node;
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97 GList *addr_list;
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98
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99 DEBUG(5) debugf("connect_resolvelist entered\n");
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101 h_errno = 0;
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102 if (isdigit(*host)) {
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103 mxip_addr *addr;
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104
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105 if ((addr_list = resolve_ip(host))) {
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106 addr = connect_hostlist(psockfd, host, port,
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107 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 /*
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112 ** Probably a hostname that begins with a digit.
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113 ** E.g. '3dwars.de'. Thus fall ...
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114 */
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115 }
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116
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117 if (!res_func_list) {
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118 logwrite(LOG_ALERT, "res_funcs not set!\n");
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119 exit(1);
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120 }
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121
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122 foreach(res_func_list, res_node) {
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123 resolve_func res_func;
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124 DEBUG(6) debugf(" foreach() body\n");
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125
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126 res_func = (resolve_func) res_node->data;
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127 if (!res_func) {
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128 logwrite(LOG_ALERT, "Empty res_func!\n");
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129 exit(1);
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130 }
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131
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132 errno = 0;
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133 if ((addr_list = res_func(NULL, host))) {
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134
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135 mxip_addr *addr;
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136 if ((addr = connect_hostlist(psockfd, host, port,
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137 addr_list))) {
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138 return addr;
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139 }
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140 DEBUG(5) debugf("connect_hostlist failed: %s\n",
885e3d886199 Various minor refactoring.
markus schnalke <meillo@marmaro.de>
parents: 400
diff changeset
141 strerror(errno));
10
26e34ae9a3e3 changed indention and line wrapping to a more consistent style
meillo@marmaro.de
parents: 0
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142 g_list_free(addr_list);
369
19d57eb1b6a1 Minor refactoring change (else-if).
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143 } else if (!g_list_next(res_node)) {
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885e3d886199 Various minor refactoring.
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parents: 400
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144 logwrite(LOG_ALERT, "could not resolve %s: %s\n",
885e3d886199 Various minor refactoring.
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parents: 400
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145 host, hstrerror(h_errno));
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26e34ae9a3e3 changed indention and line wrapping to a more consistent style
meillo@marmaro.de
parents: 0
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146 }
26e34ae9a3e3 changed indention and line wrapping to a more consistent style
meillo@marmaro.de
parents: 0
diff changeset
147 }
26e34ae9a3e3 changed indention and line wrapping to a more consistent style
meillo@marmaro.de
parents: 0
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148 return NULL;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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149
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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150 }