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annotate src/lookup.c @ 219:c5d319418813

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added config-transition this script takes config files and checks them for obsolete options if any found, it outputs them if called with -v it also explains how to substitute them the usual call: config-transition -v /etc/masqmail/*
author meillo@marmaro.de
date Wed, 21 Jul 2010 22:12:55 +0200
parents dcb315792513
children 996b53a50f55
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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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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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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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;
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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
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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parents:
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165 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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166
200
116b0269c934 reworked resolvtest; let it build; refactored in lookup.c
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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 {
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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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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
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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
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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207
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208 DEBUG(5) debugf("DNS: resolve_dns_a entered\n");
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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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
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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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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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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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264 /* CNAME resolving has to be added as well. */
0
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265
10
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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
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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
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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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meillo@marmaro.de
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
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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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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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diff changeset
298 mxip.ip = *(guint32 *) (haddr);
26e34ae9a3e3 changed indention and line wrapping to a more consistent style
meillo@marmaro.de
parents: 0
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299 mxip.pref = 0;
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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
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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:
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305 }