Mercurial > masqmail

annotate src/lookup.c @ 204:5745edd5b769

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removed the --disable-smtp-server configure option masqmail will now always have the possibility to listen on a port compiled in if you don't want it to listen on a port add this to your masqmail.conf: listen_addresses = "" also, if you don't start it as daemon it will not listen neither
author meillo@marmaro.de
date Fri, 16 Jul 2010 15:38:53 +0200
parents 138e66e1a61f
children dcb315792513
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0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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1 /* MasqMail Copyright (C) Oliver Kurth,
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2 *
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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3 * This program is free software; you can redistribute it and/or modify
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4 * it under the terms of the GNU General Public License as published by
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5 * 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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6 * (at your option) any later version.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * You should have received a copy of the GNU General Public License
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14 * along with this program; if not, write to the Free Software
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15 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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16 */
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17
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18 #include <sys/types.h>
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19 #include <netinet/in.h>
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20 #include <arpa/nameser.h>
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21 #include <resolv.h>
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22
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23 #include "masqmail.h"
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24
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26 #ifdef ENABLE_RESOLVER
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27
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28 static union {
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29 HEADER hdr;
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30 unsigned char buf[PACKETSZ];
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31 } response;
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32 static unsigned char *resp_end;
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33 static unsigned char *resp_pos;
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34
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35 static int num_answers;
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36 static char name[MAX_DNSNAME];
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37
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38 unsigned short rr_type;
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39 unsigned short rr_dlen;
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40
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41 static unsigned short
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42 getshort(unsigned char *c)
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43 {
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44 unsigned short u;
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45 u = c[0];
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46 return (u << 8) + c[1];
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47 }
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48
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49 static int
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50 dns_resolve(char *domain, int type, gboolean do_search)
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51 {
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52 int n;
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53 int i;
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54
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55 int resp_len;
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56 /*errno = 0; */
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57
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58 /*
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59 if (!stralloc_copy(&glue,domain)) return DNS_MEM;
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60 if (!stralloc_0(&glue)) return DNS_MEM;
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61 */
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62
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63 // resp_len = res_query(domain, C_IN, type, response.buf, sizeof(response));
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64 DEBUG(5) debugf("DNS: before res_search()\n");
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65 if (do_search)
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66 resp_len = res_search(domain, C_IN, type, response.buf, sizeof(response));
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67 else
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68 resp_len = res_query(domain, C_IN, type, response.buf, sizeof(response));
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69 DEBUG(5) debugf("DBG: after res_search()\n");
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70
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71 if (resp_len <= 0) {
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72 /*
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73 if (errno == ECONNREFUSED) return DNS_SOFT;
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74 if (h_errno == TRY_AGAIN) return DNS_SOFT;
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75 return DNS_HARD;
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76 */
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77 return -1;
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78 }
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79 if (resp_len >= sizeof(response))
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80 resp_len = sizeof(response);
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81
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82 resp_end = response.buf + resp_len;
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83 resp_pos = response.buf + sizeof(HEADER);
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84 n = ntohs(response.hdr.qdcount);
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85
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86 while (n-- > 0) {
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87 i = dn_expand(response.buf, resp_end, resp_pos, name, MAX_DNSNAME);
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88 if (i < 0)
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89 return -1;
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90 DEBUG(5) debugf("DBG: resolve name = %s\n", name);
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91 resp_pos += i;
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92 i = resp_end - resp_pos;
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93 if (i < QFIXEDSZ)
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94 return -1;
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95 resp_pos += QFIXEDSZ;
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96 }
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97 num_answers = ntohs(response.hdr.ancount);
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98
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99 return 0;
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100 }
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101
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102 static int
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103 dns_next()
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104 {
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105 int i;
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106
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107 if (num_answers <= 0)
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108 return 2;
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109 num_answers--;
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110
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111 if (resp_pos == resp_end)
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112 return -1; /* soft */
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113
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114 i = dn_expand(response.buf, resp_end, resp_pos, name, 256);
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115 if (i < 0)
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116 return -1; /* soft */
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117 resp_pos += i;
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118
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119 i = resp_end - resp_pos;
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120 if (i < 4 + 3 * 2)
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121 return -1; /* soft */
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122
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123 rr_type = getshort(resp_pos);
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124 rr_dlen = getshort(resp_pos + 8);
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125 resp_pos += 10;
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126
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127 return 0;
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128 }
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129
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130 static int
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131 dns_getip(guint32 * ip)
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132 {
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133 int ret;
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134
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135 if ((ret = dns_next()))
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136 return ret;
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137
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138 if (rr_type == T_A) {
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139 if (rr_dlen < 4)
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140 return -1; /* soft */
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141 *ip = *(guint32 *) (resp_pos);
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142 DEBUG(5) debugf("DNS: dns_getip(): ip = %s\n", inet_ntoa(*(struct in_addr *) ip));
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143 resp_pos += rr_dlen;
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144
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145 return 1;
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146 }
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147 resp_pos += rr_dlen;
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148 return 0;
0
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149 }
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150
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151 static int
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152 dns_getmx(int *pref)
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153 {
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154 int ret;
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155
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156 if ((ret = dns_next()))
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157 return ret;
0
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158
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159 if (rr_type == T_MX) {
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160 if (rr_dlen < 3)
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161 return -1; /* soft */
0
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162
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163 *pref = (resp_pos[0] << 8) + resp_pos[1];
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164 if (dn_expand(response.buf, resp_end, resp_pos + 2, name, MAX_DNSNAME) < 0)
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165 return -1;
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166
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167 resp_pos += rr_dlen;
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168
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169 return 1;
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170 }
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171 resp_pos += rr_dlen;
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172 return 0;
0
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173 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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174
200
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175 int
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176 dns_look_ip(gchar * domain, guint32 * ip)
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177 {
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178 gchar *n = domain;
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179
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180 while (TRUE) {
200
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181 if (dns_resolve(n, T_A, FALSE) != 0) {
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182 return -1;
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183 }
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184
200
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185 dns_next();
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186 if (rr_type == T_A) {
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187 if (rr_dlen < 4) {
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188 return -1; /* soft */
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189 }
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190 *ip = *(guint32 *) (resp_pos);
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191
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192 DEBUG(5) debugf("DNS: dns_look_ip(): ip = %s\n", inet_ntoa(*(struct in_addr *) ip));
0
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193
200
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194 resp_pos += rr_dlen;
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195 return 0;
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196 } else if (rr_type == T_CNAME) {
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197 if (dn_expand(response.buf, resp_end, resp_pos, name, MAX_DNSNAME) < 0) {
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198 return -1;
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199 }
10
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200
200
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201 DEBUG(5) debugf("DNS: (CNAME) dns_look_ip(): name = %s\n", name);
0
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202
200
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203 resp_pos += rr_dlen;
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204 n = name;
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205 } else {
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206 return -1;
200
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207 }
10
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208 }
0
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209 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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210
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211 GList*
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212 resolve_dns_a(GList * list, gchar * domain)
0
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213 {
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214 int ret;
0
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215
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216 DEBUG(5) debugf("DNS: resolve_dns_a entered\n");
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217
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218 if (dns_resolve(domain, T_A, TRUE) == 0) {
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219 mxip_addr mxip;
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220 while ((ret = dns_getip(&(mxip.ip))) != 2) {
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221 if (ret == 1) {
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222 mxip.name = g_strdup(name);
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223 mxip.pref = 0;
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224 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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225 }
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226 }
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227 }
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228 return list;
0
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229 }
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230
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231 static gint
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232 _mx_sort_func(gconstpointer aa, gconstpointer bb)
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233 {
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234 const mxip_addr *a = (mxip_addr *) aa;
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235 const mxip_addr *b = (mxip_addr *) bb;
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236
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237 if (a->pref == b->pref)
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238 return a->ip - b->ip;
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239 else
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240 return a->pref - b->pref;
0
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241 }
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242
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243 GList*
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244 resolve_dns_mx(GList * list, gchar * domain)
0
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245 {
10
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246 GList *node;
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247 int ret;
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248 int cnt = 0;
0
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249
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250 DEBUG(5) debugf("DNS: resolve_dns_mx entered\n");
0
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251
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252 if (dns_resolve(domain, T_MX, TRUE) == 0) {
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253 GList *node_next;
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254 mxip_addr mxip;
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255 while ((ret = dns_getmx(&(mxip.pref))) != 2) {
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256 if (ret == 1) {
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257 mxip.name = g_strdup(name);
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258 mxip.ip = rand();
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259 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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260 cnt++;
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261 }
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262 }
0
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263
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264 DEBUG(5) debugf("DNS: found %d mx records\n", cnt);
0
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265
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266 /* to randomize sequences with equal pref values,
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267 we temporarily 'misused' the ip field and
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268 put a random number in it as a secondary sort key.
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269 */
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270 list = g_list_sort(list, _mx_sort_func);
0
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271
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272 /* CNAME resolving has to be added as well. */
0
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273
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274 for (node = g_list_first(list); node != NULL; node = node_next) {
0
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275
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276 mxip_addr *p_mxip = (mxip_addr *) (node->data);
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277 node_next = g_list_next(node);
0
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278
10
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279 if (dns_look_ip(p_mxip->name, &(p_mxip->ip)) != 0) {
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280 DEBUG(1) debugf("DNS: could not resolve target of mx %s\n", p_mxip->name);
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281 list = g_list_remove_link(list, node);
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282 g_free(node->data);
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283 g_list_free_1(node);
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diff changeset
284 }
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285 }
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286 }
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287 return list;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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288 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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289
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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290 #endif
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291
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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292 /* now something completely different... */
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293
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294 GList*
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295 resolve_byname(GList * list, gchar * domain)
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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296 {
10
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297 struct hostent *hent;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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298
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299 DEBUG(5) debugf("DNS: resolve_byname entered\n");
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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300
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301 if ((hent = gethostbyname(domain))) {
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302 char *haddr;
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303 int i = 0;
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304 while ((haddr = hent->h_addr_list[i++])) {
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305 mxip_addr mxip;
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306 mxip.ip = *(guint32 *) (haddr);
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307 mxip.pref = 0;
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308 mxip.name = g_strdup(hent->h_name);
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309 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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310 }
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311 }
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312 return list;
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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313 }