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annotate src/lookup.c @ 286:e2f6eefbd573

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further, minor, improvements to man/masqmail.8
author markus schnalke <meillo@marmaro.de>
date Tue, 07 Dec 2010 17:21:07 -0300
parents 996b53a50f55
children 41958685480d
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1 /* MasqMail
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2 * Copyright (C) Oliver Kurth
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3 * Copyright (C) markus schnalke <meillo@marmaro.de>
0
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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 *
0
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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18 */
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19
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20 #include <sys/types.h>
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21 #include <netinet/in.h>
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22 #include <arpa/nameser.h>
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23 #include <resolv.h>
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24
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25 #include "masqmail.h"
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26
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27
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28 #ifdef ENABLE_RESOLVER
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29
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30 static union {
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31 HEADER hdr;
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32 unsigned char buf[PACKETSZ];
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33 } response;
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34 static unsigned char *resp_end;
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35 static unsigned char *resp_pos;
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36
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37 static int num_answers;
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38 static char name[MAX_DNSNAME];
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39
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40 unsigned short rr_type;
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41 unsigned short rr_dlen;
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42
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43 static unsigned short
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44 getshort(unsigned char *c)
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45 {
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46 unsigned short u;
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47 u = c[0];
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48 return (u << 8) + c[1];
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49 }
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50
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51 static int
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52 dns_resolve(char *domain, int type, gboolean do_search)
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53 {
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54 int n;
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55 int i;
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56 int resp_len;
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57
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58 DEBUG(5) debugf("DNS: before res_search()\n");
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59 if (do_search)
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60 resp_len = res_search(domain, C_IN, type, response.buf, sizeof(response));
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61 else
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62 resp_len = res_query(domain, C_IN, type, response.buf, sizeof(response));
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63 DEBUG(5) debugf("DBG: after res_search()\n");
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64
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65 if (resp_len <= 0) {
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66 /*
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67 if (errno == ECONNREFUSED) return DNS_SOFT;
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68 if (h_errno == TRY_AGAIN) return DNS_SOFT;
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69 return DNS_HARD;
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70 */
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71 return -1;
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72 }
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73 if (resp_len >= sizeof(response))
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74 resp_len = sizeof(response);
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75
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76 resp_end = response.buf + resp_len;
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77 resp_pos = response.buf + sizeof(HEADER);
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78 n = ntohs(response.hdr.qdcount);
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79
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80 while (n-- > 0) {
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81 i = dn_expand(response.buf, resp_end, resp_pos, name, MAX_DNSNAME);
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82 if (i < 0)
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83 return -1;
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84 DEBUG(5) debugf("DBG: resolve name = %s\n", name);
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85 resp_pos += i;
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86 i = resp_end - resp_pos;
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87 if (i < QFIXEDSZ)
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88 return -1;
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89 resp_pos += QFIXEDSZ;
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90 }
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91 num_answers = ntohs(response.hdr.ancount);
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92
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93 return 0;
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94 }
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95
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96 static int
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97 dns_next()
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98 {
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99 int i;
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100
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101 if (num_answers <= 0)
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102 return 2;
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103 num_answers--;
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104
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105 if (resp_pos == resp_end)
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106 return -1; /* soft */
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107
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108 i = dn_expand(response.buf, resp_end, resp_pos, name, 256);
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109 if (i < 0)
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110 return -1; /* soft */
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111 resp_pos += i;
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112
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113 i = resp_end - resp_pos;
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114 if (i < 4 + 3 * 2)
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115 return -1; /* soft */
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116
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117 rr_type = getshort(resp_pos);
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118 rr_dlen = getshort(resp_pos + 8);
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119 resp_pos += 10;
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120
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121 return 0;
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122 }
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123
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124 static int
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125 dns_getip(guint32 * ip)
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126 {
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127 int ret;
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128
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129 if ((ret = dns_next()))
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130 return ret;
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131
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132 if (rr_type == T_A) {
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133 if (rr_dlen < 4)
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134 return -1; /* soft */
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135 *ip = *(guint32 *) (resp_pos);
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136 DEBUG(5) debugf("DNS: dns_getip(): ip = %s\n", inet_ntoa(*(struct in_addr *) ip));
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137 resp_pos += rr_dlen;
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138
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139 return 1;
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140 }
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141 resp_pos += rr_dlen;
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142 return 0;
0
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143 }
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144
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145 static int
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146 dns_getmx(int *pref)
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147 {
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148 int ret;
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149
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150 if ((ret = dns_next()))
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151 return ret;
0
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152
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153 if (rr_type == T_MX) {
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parents: 0
diff changeset
154 if (rr_dlen < 3)
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diff changeset
155 return -1; /* soft */
0
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156
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157 *pref = (resp_pos[0] << 8) + resp_pos[1];
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158 if (dn_expand(response.buf, resp_end, resp_pos + 2, name, MAX_DNSNAME) < 0)
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159 return -1;
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160
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161 resp_pos += rr_dlen;
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162
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163 return 1;
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parents: 0
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164 }
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165 resp_pos += rr_dlen;
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166 return 0;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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parents:
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167 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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168
200
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169 int
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170 dns_look_ip(gchar * domain, guint32 * ip)
0
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171 {
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172 gchar *n = domain;
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173
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174 while (TRUE) {
200
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175 if (dns_resolve(n, T_A, FALSE) != 0) {
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176 return -1;
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177 }
10
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178
200
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179 dns_next();
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180 if (rr_type == T_A) {
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181 if (rr_dlen < 4) {
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182 return -1; /* soft */
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183 }
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184 *ip = *(guint32 *) (resp_pos);
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185
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186 DEBUG(5) debugf("DNS: dns_look_ip(): ip = %s\n", inet_ntoa(*(struct in_addr *) ip));
0
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187
200
116b0269c934 reworked resolvtest; let it build; refactored in lookup.c
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188 resp_pos += rr_dlen;
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189 return 0;
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190 } else if (rr_type == T_CNAME) {
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191 if (dn_expand(response.buf, resp_end, resp_pos, name, MAX_DNSNAME) < 0) {
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192 return -1;
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193 }
10
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194
200
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195 DEBUG(5) debugf("DNS: (CNAME) dns_look_ip(): name = %s\n", name);
0
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196
200
116b0269c934 reworked resolvtest; let it build; refactored in lookup.c
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197 resp_pos += rr_dlen;
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198 n = name;
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199 } else {
10
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200 return -1;
200
116b0269c934 reworked resolvtest; let it build; refactored in lookup.c
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parents: 15
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201 }
10
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parents: 0
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202 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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203 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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204
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205 GList*
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206 resolve_dns_a(GList * list, gchar * domain)
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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207 {
10
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208 int ret;
0
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209
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210 DEBUG(5) debugf("DNS: resolve_dns_a entered\n");
0
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211
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212 if (dns_resolve(domain, T_A, TRUE) == 0) {
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213 mxip_addr mxip;
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214 while ((ret = dns_getip(&(mxip.ip))) != 2) {
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215 if (ret == 1) {
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216 mxip.name = g_strdup(name);
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217 mxip.pref = 0;
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218 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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219 }
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220 }
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221 }
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222 return list;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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223 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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224
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225 static gint
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226 _mx_sort_func(gconstpointer aa, gconstpointer bb)
0
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227 {
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228 const mxip_addr *a = (mxip_addr *) aa;
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229 const mxip_addr *b = (mxip_addr *) bb;
0
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230
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231 if (a->pref == b->pref)
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232 return a->ip - b->ip;
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233 else
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234 return a->pref - b->pref;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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235 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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236
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237 GList*
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238 resolve_dns_mx(GList * list, gchar * domain)
0
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239 {
10
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240 GList *node;
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241 int ret;
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242 int cnt = 0;
0
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243
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244 DEBUG(5) debugf("DNS: resolve_dns_mx entered\n");
0
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245
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246 if (dns_resolve(domain, T_MX, TRUE) == 0) {
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247 GList *node_next;
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248 mxip_addr mxip;
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249 while ((ret = dns_getmx(&(mxip.pref))) != 2) {
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diff changeset
250 if (ret == 1) {
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251 mxip.name = g_strdup(name);
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252 mxip.ip = rand();
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253 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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254 cnt++;
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255 }
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256 }
0
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257
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258 DEBUG(5) debugf("DNS: found %d mx records\n", cnt);
0
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259
10
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260 /* to randomize sequences with equal pref values,
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261 we temporarily 'misused' the ip field and
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262 put a random number in it as a secondary sort key.
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263 */
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264 list = g_list_sort(list, _mx_sort_func);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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265
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266 /* CNAME resolving has to be added as well. */
0
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267
10
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268 for (node = g_list_first(list); node != NULL; node = node_next) {
0
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269
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270 mxip_addr *p_mxip = (mxip_addr *) (node->data);
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271 node_next = g_list_next(node);
0
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272
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273 if (dns_look_ip(p_mxip->name, &(p_mxip->ip)) != 0) {
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274 DEBUG(1) debugf("DNS: could not resolve target of mx %s\n", p_mxip->name);
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diff changeset
275 list = g_list_remove_link(list, node);
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diff changeset
276 g_free(node->data);
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diff changeset
277 g_list_free_1(node);
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parents: 0
diff changeset
278 }
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parents: 0
diff changeset
279 }
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parents: 0
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280 }
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281 return list;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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282 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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283
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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284 #endif
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285
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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286 /* now something completely different... */
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287
10
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diff changeset
288 GList*
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289 resolve_byname(GList * list, gchar * domain)
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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290 {
10
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diff changeset
291 struct hostent *hent;
0
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292
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293 DEBUG(5) debugf("DNS: resolve_byname entered\n");
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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294
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295 if ((hent = gethostbyname(domain))) {
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diff changeset
296 char *haddr;
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diff changeset
297 int i = 0;
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parents: 0
diff changeset
298 while ((haddr = hent->h_addr_list[i++])) {
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meillo@marmaro.de
parents: 0
diff changeset
299 mxip_addr mxip;
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meillo@marmaro.de
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300 mxip.ip = *(guint32 *) (haddr);
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meillo@marmaro.de
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301 mxip.pref = 0;
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302 mxip.name = g_strdup(hent->h_name);
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303 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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meillo@marmaro.de
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304 }
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305 }
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306 return list;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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307 }