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annotate src/lookup.c @ 209:10da50168dab

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replaced the MD5 implementation with the one of Solar Designer Until now, the sample code of RFC 1321 was used. It had an ugly license. Now we use the implementation of Solar Designer, which is in the Public Domain. http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
author meillo@marmaro.de
date Sun, 18 Jul 2010 21:58:15 +0200
parents dcb315792513
children 996b53a50f55
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0
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1 /* MasqMail Copyright (C) Oliver Kurth,
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2 *
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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
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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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 *
0
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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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25
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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 int resp_len;
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55
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56 DEBUG(5) debugf("DNS: before res_search()\n");
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57 if (do_search)
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58 resp_len = res_search(domain, C_IN, type, response.buf, sizeof(response));
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59 else
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60 resp_len = res_query(domain, C_IN, type, response.buf, sizeof(response));
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61 DEBUG(5) debugf("DBG: after res_search()\n");
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62
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63 if (resp_len <= 0) {
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64 /*
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65 if (errno == ECONNREFUSED) return DNS_SOFT;
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66 if (h_errno == TRY_AGAIN) return DNS_SOFT;
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67 return DNS_HARD;
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68 */
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69 return -1;
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70 }
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71 if (resp_len >= sizeof(response))
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72 resp_len = sizeof(response);
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73
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74 resp_end = response.buf + resp_len;
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75 resp_pos = response.buf + sizeof(HEADER);
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76 n = ntohs(response.hdr.qdcount);
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77
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78 while (n-- > 0) {
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79 i = dn_expand(response.buf, resp_end, resp_pos, name, MAX_DNSNAME);
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80 if (i < 0)
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81 return -1;
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82 DEBUG(5) debugf("DBG: resolve name = %s\n", name);
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83 resp_pos += i;
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84 i = resp_end - resp_pos;
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85 if (i < QFIXEDSZ)
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86 return -1;
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87 resp_pos += QFIXEDSZ;
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88 }
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89 num_answers = ntohs(response.hdr.ancount);
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90
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91 return 0;
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92 }
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93
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94 static int
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95 dns_next()
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96 {
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97 int i;
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98
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99 if (num_answers <= 0)
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100 return 2;
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101 num_answers--;
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102
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103 if (resp_pos == resp_end)
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104 return -1; /* soft */
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105
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106 i = dn_expand(response.buf, resp_end, resp_pos, name, 256);
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107 if (i < 0)
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108 return -1; /* soft */
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109 resp_pos += i;
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110
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111 i = resp_end - resp_pos;
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112 if (i < 4 + 3 * 2)
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113 return -1; /* soft */
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114
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115 rr_type = getshort(resp_pos);
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116 rr_dlen = getshort(resp_pos + 8);
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117 resp_pos += 10;
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118
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119 return 0;
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120 }
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121
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122 static int
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123 dns_getip(guint32 * ip)
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124 {
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125 int ret;
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126
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127 if ((ret = dns_next()))
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128 return ret;
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129
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130 if (rr_type == T_A) {
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131 if (rr_dlen < 4)
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132 return -1; /* soft */
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133 *ip = *(guint32 *) (resp_pos);
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134 DEBUG(5) debugf("DNS: dns_getip(): ip = %s\n", inet_ntoa(*(struct in_addr *) ip));
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135 resp_pos += rr_dlen;
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136
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137 return 1;
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138 }
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139 resp_pos += rr_dlen;
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140 return 0;
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141 }
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142
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143 static int
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144 dns_getmx(int *pref)
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145 {
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146 int ret;
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147
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148 if ((ret = dns_next()))
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149 return ret;
0
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150
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151 if (rr_type == T_MX) {
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parents: 0
diff changeset
152 if (rr_dlen < 3)
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153 return -1; /* soft */
0
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154
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155 *pref = (resp_pos[0] << 8) + resp_pos[1];
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156 if (dn_expand(response.buf, resp_end, resp_pos + 2, name, MAX_DNSNAME) < 0)
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157 return -1;
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158
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159 resp_pos += rr_dlen;
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160
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161 return 1;
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parents: 0
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162 }
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163 resp_pos += rr_dlen;
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164 return 0;
0
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165 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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166
200
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167 int
10
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168 dns_look_ip(gchar * domain, guint32 * ip)
0
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169 {
10
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170 gchar *n = domain;
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171
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172 while (TRUE) {
200
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173 if (dns_resolve(n, T_A, FALSE) != 0) {
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174 return -1;
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parents: 15
diff changeset
175 }
10
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176
200
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177 dns_next();
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178 if (rr_type == T_A) {
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179 if (rr_dlen < 4) {
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180 return -1; /* soft */
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181 }
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182 *ip = *(guint32 *) (resp_pos);
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183
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184 DEBUG(5) debugf("DNS: dns_look_ip(): ip = %s\n", inet_ntoa(*(struct in_addr *) ip));
0
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185
200
116b0269c934 reworked resolvtest; let it build; refactored in lookup.c
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186 resp_pos += rr_dlen;
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187 return 0;
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188 } else if (rr_type == T_CNAME) {
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189 if (dn_expand(response.buf, resp_end, resp_pos, name, MAX_DNSNAME) < 0) {
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190 return -1;
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parents: 15
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191 }
10
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192
200
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193 DEBUG(5) debugf("DNS: (CNAME) dns_look_ip(): name = %s\n", name);
0
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194
200
116b0269c934 reworked resolvtest; let it build; refactored in lookup.c
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195 resp_pos += rr_dlen;
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196 n = name;
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197 } else {
10
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198 return -1;
200
116b0269c934 reworked resolvtest; let it build; refactored in lookup.c
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parents: 15
diff changeset
199 }
10
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parents: 0
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200 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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201 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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202
10
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203 GList*
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204 resolve_dns_a(GList * list, gchar * domain)
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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205 {
10
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206 int ret;
0
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207
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208 DEBUG(5) debugf("DNS: resolve_dns_a entered\n");
0
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209
10
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210 if (dns_resolve(domain, T_A, TRUE) == 0) {
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211 mxip_addr mxip;
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212 while ((ret = dns_getip(&(mxip.ip))) != 2) {
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213 if (ret == 1) {
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214 mxip.name = g_strdup(name);
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215 mxip.pref = 0;
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216 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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217 }
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218 }
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219 }
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220 return list;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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221 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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222
10
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223 static gint
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224 _mx_sort_func(gconstpointer aa, gconstpointer bb)
0
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225 {
10
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226 const mxip_addr *a = (mxip_addr *) aa;
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227 const mxip_addr *b = (mxip_addr *) bb;
0
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228
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229 if (a->pref == b->pref)
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230 return a->ip - b->ip;
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231 else
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232 return a->pref - b->pref;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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233 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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234
10
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235 GList*
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236 resolve_dns_mx(GList * list, gchar * domain)
0
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237 {
10
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238 GList *node;
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diff changeset
239 int ret;
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240 int cnt = 0;
0
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241
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242 DEBUG(5) debugf("DNS: resolve_dns_mx entered\n");
0
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243
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244 if (dns_resolve(domain, T_MX, TRUE) == 0) {
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245 GList *node_next;
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246 mxip_addr mxip;
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247 while ((ret = dns_getmx(&(mxip.pref))) != 2) {
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parents: 0
diff changeset
248 if (ret == 1) {
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diff changeset
249 mxip.name = g_strdup(name);
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250 mxip.ip = rand();
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251 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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diff changeset
252 cnt++;
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253 }
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254 }
0
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255
10
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256 DEBUG(5) debugf("DNS: found %d mx records\n", cnt);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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257
10
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parents: 0
diff changeset
258 /* to randomize sequences with equal pref values,
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259 we temporarily 'misused' the ip field and
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diff changeset
260 put a random number in it as a secondary sort key.
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diff changeset
261 */
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262 list = g_list_sort(list, _mx_sort_func);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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263
10
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diff changeset
264 /* CNAME resolving has to be added as well. */
0
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265
10
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diff changeset
266 for (node = g_list_first(list); node != NULL; node = node_next) {
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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267
10
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268 mxip_addr *p_mxip = (mxip_addr *) (node->data);
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diff changeset
269 node_next = g_list_next(node);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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270
10
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271 if (dns_look_ip(p_mxip->name, &(p_mxip->ip)) != 0) {
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272 DEBUG(1) debugf("DNS: could not resolve target of mx %s\n", p_mxip->name);
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diff changeset
273 list = g_list_remove_link(list, node);
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diff changeset
274 g_free(node->data);
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parents: 0
diff changeset
275 g_list_free_1(node);
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parents: 0
diff changeset
276 }
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parents: 0
diff changeset
277 }
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parents: 0
diff changeset
278 }
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parents: 0
diff changeset
279 return list;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
280 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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281
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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282 #endif
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283
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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284 /* now something completely different... */
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285
10
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diff changeset
286 GList*
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parents: 0
diff changeset
287 resolve_byname(GList * list, gchar * domain)
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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diff changeset
288 {
10
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diff changeset
289 struct hostent *hent;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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290
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291 DEBUG(5) debugf("DNS: resolve_byname entered\n");
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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292
10
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diff changeset
293 if ((hent = gethostbyname(domain))) {
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parents: 0
diff changeset
294 char *haddr;
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parents: 0
diff changeset
295 int i = 0;
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meillo@marmaro.de
parents: 0
diff changeset
296 while ((haddr = hent->h_addr_list[i++])) {
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parents: 0
diff changeset
297 mxip_addr mxip;
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meillo@marmaro.de
parents: 0
diff changeset
298 mxip.ip = *(guint32 *) (haddr);
26e34ae9a3e3 changed indention and line wrapping to a more consistent style
meillo@marmaro.de
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299 mxip.pref = 0;
26e34ae9a3e3 changed indention and line wrapping to a more consistent style
meillo@marmaro.de
parents: 0
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300 mxip.name = g_strdup(hent->h_name);
26e34ae9a3e3 changed indention and line wrapping to a more consistent style
meillo@marmaro.de
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301 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
26e34ae9a3e3 changed indention and line wrapping to a more consistent style
meillo@marmaro.de
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302 }
26e34ae9a3e3 changed indention and line wrapping to a more consistent style
meillo@marmaro.de
parents: 0
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303 }
26e34ae9a3e3 changed indention and line wrapping to a more consistent style
meillo@marmaro.de
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304 return list;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
305 }