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Removes Freshmeat.net from the docs The site, which was later renamed to freecode.com, is no longer maintained (contains only a static copy).
author markus schnalke <meillo@marmaro.de>
date Sat, 07 Feb 2015 11:45:07 +0100
parents b27f66555ba8
children
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1 /*
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2 ** MasqMail
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3 ** Copyright (C) Oliver Kurth
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4 ** Copyright (C) markus schnalke <meillo@marmaro.de>
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5 **
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6 ** This program is free software; you can redistribute it and/or modify
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7 ** it under the terms of the GNU General Public License as published by
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8 ** the Free Software Foundation; either version 2 of the License, or
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9 ** (at your option) any later version.
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10 **
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11 ** This program is distributed in the hope that it will be useful,
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12 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 ** GNU General Public License for more details.
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15 **
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16 ** You should have received a copy of the GNU General Public License
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17 ** along with this program; if not, write to the Free Software
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18 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19 */
0
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20
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21 #include <sys/types.h>
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22 #include <netinet/in.h>
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23 #include <arpa/nameser.h>
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24 #include <resolv.h>
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25
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26 #include "masqmail.h"
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27
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28
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29 #ifdef ENABLE_RESOLVER
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30
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31 static union {
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32 HEADER hdr;
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33 unsigned char buf[PACKETSZ];
0
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34 } response;
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35 static unsigned char *resp_end;
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36 static unsigned char *resp_pos;
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37
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38 static int num_answers;
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39 static char name[MAX_DNSNAME];
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40
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41 unsigned short rr_type;
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42 unsigned short rr_dlen;
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43
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44 static unsigned short
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45 getshort(unsigned char *c)
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46 {
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47 unsigned short u;
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48 u = c[0];
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49 return (u << 8) + c[1];
0
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50 }
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51
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52 static int
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53 dns_resolve(char *domain, int type, gboolean do_search)
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54 {
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55 int n;
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56 int i;
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57 int resp_len;
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58
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59 DEBUG(5) debugf("DNS: before res_search()\n");
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60 if (do_search)
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61 resp_len = res_search(domain, C_IN, type, response.buf, sizeof(response));
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62 else
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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("DBG: after res_search()\n");
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65
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66 if (resp_len <= 0) {
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67 /*
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68 ** if (errno == ECONNREFUSED) return DNS_SOFT;
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69 ** if (h_errno == TRY_AGAIN) return DNS_SOFT;
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70 ** return DNS_HARD;
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71 */
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72 return -1;
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73 }
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74 if (resp_len >= sizeof(response))
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75 resp_len = sizeof(response);
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76
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77 resp_end = response.buf + resp_len;
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78 resp_pos = response.buf + sizeof(HEADER);
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79 n = ntohs(response.hdr.qdcount);
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80
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81 while (n-- > 0) {
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82 i = dn_expand(response.buf, resp_end, resp_pos, name, MAX_DNSNAME);
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83 if (i < 0)
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84 return -1;
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85 DEBUG(5) debugf("DBG: resolve name = %s\n", name);
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86 resp_pos += i;
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87 i = resp_end - resp_pos;
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88 if (i < QFIXEDSZ)
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89 return -1;
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90 resp_pos += QFIXEDSZ;
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91 }
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92 num_answers = ntohs(response.hdr.ancount);
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93
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94 return 0;
0
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95 }
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96
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97 static int
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98 dns_next()
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99 {
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100 int i;
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101
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102 if (num_answers <= 0)
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103 return 2;
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104 num_answers--;
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105
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106 if (resp_pos == resp_end)
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107 return -1; /* soft */
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108
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109 i = dn_expand(response.buf, resp_end, resp_pos, name, 256);
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110 if (i < 0)
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111 return -1; /* soft */
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112 resp_pos += i;
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113
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114 i = resp_end - resp_pos;
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115 if (i < 4 + 3 * 2)
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116 return -1; /* soft */
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117
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118 rr_type = getshort(resp_pos);
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119 rr_dlen = getshort(resp_pos + 8);
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120 resp_pos += 10;
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121
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122 return 0;
0
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123 }
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124
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125 static int
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126 dns_getip(guint32 *ip)
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127 {
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128 int ret;
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129
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130 if ((ret = dns_next()))
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131 return ret;
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132
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133 if (rr_type == T_A) {
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134 if (rr_dlen < 4)
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135 return -1; /* soft */
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136 *ip = *(guint32 *) (resp_pos);
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137 DEBUG(5) debugf("DNS: dns_getip(): ip = %s\n", inet_ntoa(*(struct in_addr *) ip));
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138 resp_pos += rr_dlen;
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139
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140 return 1;
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141 }
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142 resp_pos += rr_dlen;
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143 return 0;
0
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144 }
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145
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146 static int
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parents: 0
diff changeset
147 dns_getmx(int *pref)
0
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diff changeset
148 {
10
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parents: 0
diff changeset
149 int ret;
0
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150
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meillo@marmaro.de
parents: 0
diff changeset
151 if ((ret = dns_next()))
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meillo@marmaro.de
parents: 0
diff changeset
152 return ret;
0
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153
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meillo@marmaro.de
parents: 0
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154 if (rr_type == T_MX) {
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meillo@marmaro.de
parents: 0
diff changeset
155 if (rr_dlen < 3)
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meillo@marmaro.de
parents: 0
diff changeset
156 return -1; /* soft */
0
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157
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158 *pref = (resp_pos[0] << 8) + resp_pos[1];
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159 if (dn_expand(response.buf, resp_end, resp_pos + 2, name, MAX_DNSNAME) < 0)
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160 return -1;
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parents: 0
diff changeset
161
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162 resp_pos += rr_dlen;
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parents: 0
diff changeset
163
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164 return 1;
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parents: 0
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165 }
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parents: 0
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166 resp_pos += rr_dlen;
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parents: 0
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167 return 0;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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168 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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169
200
116b0269c934 reworked resolvtest; let it build; refactored in lookup.c
meillo@marmaro.de
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170 int
366
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parents: 224
diff changeset
171 dns_look_ip(gchar *domain, guint32 *ip)
0
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172 {
10
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173 gchar *n = domain;
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174
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175 while (TRUE) {
200
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parents: 15
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176 if (dns_resolve(n, T_A, FALSE) != 0) {
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177 return -1;
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meillo@marmaro.de
parents: 15
diff changeset
178 }
10
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179
200
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diff changeset
180 dns_next();
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181 if (rr_type == T_A) {
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meillo@marmaro.de
parents: 15
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182 if (rr_dlen < 4) {
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183 return -1; /* soft */
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meillo@marmaro.de
parents: 15
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184 }
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meillo@marmaro.de
parents: 15
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185 *ip = *(guint32 *) (resp_pos);
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186
116b0269c934 reworked resolvtest; let it build; refactored in lookup.c
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187 DEBUG(5) debugf("DNS: dns_look_ip(): ip = %s\n", inet_ntoa(*(struct in_addr *) ip));
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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188
200
116b0269c934 reworked resolvtest; let it build; refactored in lookup.c
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189 resp_pos += rr_dlen;
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190 return 0;
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meillo@marmaro.de
parents: 15
diff changeset
191 } else if (rr_type == T_CNAME) {
116b0269c934 reworked resolvtest; let it build; refactored in lookup.c
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parents: 15
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192 if (dn_expand(response.buf, resp_end, resp_pos, name, MAX_DNSNAME) < 0) {
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parents: 15
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193 return -1;
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parents: 15
diff changeset
194 }
10
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195
200
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parents: 15
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196 DEBUG(5) debugf("DNS: (CNAME) dns_look_ip(): name = %s\n", name);
0
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197
200
116b0269c934 reworked resolvtest; let it build; refactored in lookup.c
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198 resp_pos += rr_dlen;
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199 n = name;
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parents: 15
diff changeset
200 } else {
10
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201 return -1;
200
116b0269c934 reworked resolvtest; let it build; refactored in lookup.c
meillo@marmaro.de
parents: 15
diff changeset
202 }
10
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meillo@marmaro.de
parents: 0
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203 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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204 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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205
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206 GList*
366
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markus schnalke <meillo@marmaro.de>
parents: 224
diff changeset
207 resolve_dns_a(GList *list, gchar *domain)
0
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208 {
10
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209 int ret;
0
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210
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211 DEBUG(5) debugf("DNS: resolve_dns_a entered\n");
0
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212
10
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213 if (dns_resolve(domain, T_A, TRUE) == 0) {
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214 mxip_addr mxip;
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215 while ((ret = dns_getip(&(mxip.ip))) != 2) {
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216 if (ret == 1) {
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217 mxip.name = g_strdup(name);
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218 mxip.pref = 0;
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219 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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220 }
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221 }
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parents: 0
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222 }
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parents: 0
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223 return list;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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224 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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225
10
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226 static gint
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227 _mx_sort_func(gconstpointer aa, gconstpointer bb)
0
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228 {
10
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229 const mxip_addr *a = (mxip_addr *) aa;
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230 const mxip_addr *b = (mxip_addr *) bb;
0
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231
10
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232 if (a->pref == b->pref)
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233 return a->ip - b->ip;
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parents: 0
diff changeset
234 else
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235 return a->pref - b->pref;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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236 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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237
10
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parents: 0
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238 GList*
366
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markus schnalke <meillo@marmaro.de>
parents: 224
diff changeset
239 resolve_dns_mx(GList *list, gchar *domain)
0
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240 {
10
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parents: 0
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241 GList *node;
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parents: 0
diff changeset
242 int ret;
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parents: 0
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243 int cnt = 0;
0
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244
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245 DEBUG(5) debugf("DNS: resolve_dns_mx entered\n");
0
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246
10
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parents: 0
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247 if (dns_resolve(domain, T_MX, TRUE) == 0) {
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parents: 0
diff changeset
248 GList *node_next;
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parents: 0
diff changeset
249 mxip_addr mxip;
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parents: 0
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250 while ((ret = dns_getmx(&(mxip.pref))) != 2) {
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meillo@marmaro.de
parents: 0
diff changeset
251 if (ret == 1) {
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parents: 0
diff changeset
252 mxip.name = g_strdup(name);
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parents: 0
diff changeset
253 mxip.ip = rand();
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parents: 0
diff changeset
254 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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parents: 0
diff changeset
255 cnt++;
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meillo@marmaro.de
parents: 0
diff changeset
256 }
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meillo@marmaro.de
parents: 0
diff changeset
257 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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258
10
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parents: 0
diff changeset
259 DEBUG(5) debugf("DNS: found %d mx records\n", cnt);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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260
367
b27f66555ba8 Reformated multiline comments to have leading asterisks on each line
markus schnalke <meillo@marmaro.de>
parents: 366
diff changeset
261 /*
b27f66555ba8 Reformated multiline comments to have leading asterisks on each line
markus schnalke <meillo@marmaro.de>
parents: 366
diff changeset
262 ** to randomize sequences with equal pref values,
b27f66555ba8 Reformated multiline comments to have leading asterisks on each line
markus schnalke <meillo@marmaro.de>
parents: 366
diff changeset
263 ** we temporarily 'misused' the ip field and
b27f66555ba8 Reformated multiline comments to have leading asterisks on each line
markus schnalke <meillo@marmaro.de>
parents: 366
diff changeset
264 ** put a random number in it as a secondary sort key.
b27f66555ba8 Reformated multiline comments to have leading asterisks on each line
markus schnalke <meillo@marmaro.de>
parents: 366
diff changeset
265 */
10
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meillo@marmaro.de
parents: 0
diff changeset
266 list = g_list_sort(list, _mx_sort_func);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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parents:
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267
10
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meillo@marmaro.de
parents: 0
diff changeset
268 /* CNAME resolving has to be added as well. */
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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269
10
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meillo@marmaro.de
parents: 0
diff changeset
270 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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parents:
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271
10
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parents: 0
diff changeset
272 mxip_addr *p_mxip = (mxip_addr *) (node->data);
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parents: 0
diff changeset
273 node_next = g_list_next(node);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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274
10
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meillo@marmaro.de
parents: 0
diff changeset
275 if (dns_look_ip(p_mxip->name, &(p_mxip->ip)) != 0) {
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meillo@marmaro.de
parents: 0
diff changeset
276 DEBUG(1) debugf("DNS: could not resolve target of mx %s\n", p_mxip->name);
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meillo@marmaro.de
parents: 0
diff changeset
277 list = g_list_remove_link(list, node);
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meillo@marmaro.de
parents: 0
diff changeset
278 g_free(node->data);
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meillo@marmaro.de
parents: 0
diff changeset
279 g_list_free_1(node);
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meillo@marmaro.de
parents: 0
diff changeset
280 }
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meillo@marmaro.de
parents: 0
diff changeset
281 }
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meillo@marmaro.de
parents: 0
diff changeset
282 }
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meillo@marmaro.de
parents: 0
diff changeset
283 return list;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
284 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
285
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
286 #endif
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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287
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
288 /* now something completely different... */
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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289
10
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meillo@marmaro.de
parents: 0
diff changeset
290 GList*
366
41958685480d Switched to `type *name' style
markus schnalke <meillo@marmaro.de>
parents: 224
diff changeset
291 resolve_byname(GList *list, gchar *domain)
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
292 {
10
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meillo@marmaro.de
parents: 0
diff changeset
293 struct hostent *hent;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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parents:
diff changeset
294
10
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meillo@marmaro.de
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295 DEBUG(5) debugf("DNS: resolve_byname entered\n");
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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296
10
26e34ae9a3e3 changed indention and line wrapping to a more consistent style
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297 if ((hent = gethostbyname(domain))) {
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298 char *haddr;
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299 int i = 0;
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300 while ((haddr = hent->h_addr_list[i++])) {
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301 mxip_addr mxip;
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302 mxip.ip = *(guint32 *) (haddr);
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303 mxip.pref = 0;
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304 mxip.name = g_strdup(hent->h_name);
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305 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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meillo@marmaro.de
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306 }
26e34ae9a3e3 changed indention and line wrapping to a more consistent style
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307 }
26e34ae9a3e3 changed indention and line wrapping to a more consistent style
meillo@marmaro.de
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308 return list;
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08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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309 }