Mercurial > masqmail

annotate src/lookup.c @ 323:29de6a1c4538

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Fixed an important bug with folded headers! g_strconcat() returns a *copy* of the string, but hdr->value still pointed to the old header (which probably was a memory leak, too). If the folded part had been quite small it was likely that the new string was at the same position as the old one, thus making everything go well. But if pretty long headers were folded several times it was likely that the new string was allocated somewhere else in memory, thus breaking things. In result mails to lots of recipients (folded header) were frequently only sent to the ones in the first line. Sorry for the inconvenience.
author meillo@marmaro.de
date Fri, 03 Jun 2011 09:47:27 +0200
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;
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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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154 if (rr_dlen < 3)
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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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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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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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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
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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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diff changeset
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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diff changeset
254 cnt++;
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255 }
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256 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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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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diff changeset
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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diff changeset
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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diff changeset
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
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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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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diff changeset
295 if ((hent = gethostbyname(domain))) {
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diff changeset
296 char *haddr;
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297 int i = 0;
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298 while ((haddr = hent->h_addr_list[i++])) {
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299 mxip_addr mxip;
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300 mxip.ip = *(guint32 *) (haddr);
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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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304 }
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305 }
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306 return list;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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307 }