Mercurial > masqmail-0.2

annotate src/lookup.c @ 14:a8f3424347dc

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replaced number 0 with character \0 where appropriate
author meillo@marmaro.de
date Wed, 29 Oct 2008 21:21:26 +0100
parents 26e34ae9a3e3
children f671821d8222
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0
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1 /* MasqMail Copyright (C) Oliver Kurth,
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2 *
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3 * This program is free software; you can redistribute it and/or modify
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4 * it under the terms of the GNU General Public License as published by
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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5 * the Free Software Foundation; either version 2 of the License, or
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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6 * (at your option) any later version.
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7 *
0
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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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 #ifdef RESOLV_TEST
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26
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27 #undef DEBUG
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28 #define DEBUG(x) if(x > 0)
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29
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30 #define debugf g_print
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31 #endif
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32
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33 #ifdef ENABLE_RESOLVER
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34
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35 static union {
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36 HEADER hdr;
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37 unsigned char buf[PACKETSZ];
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38 } response;
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39 static unsigned char *resp_end;
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40 static unsigned char *resp_pos;
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41
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42 static int num_answers;
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43 static char name[MAX_DNSNAME];
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44
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45 unsigned short rr_type;
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46 unsigned short rr_dlen;
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47
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48 static unsigned short
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49 getshort(unsigned char *c)
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50 {
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51 unsigned short u;
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52 u = c[0];
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53 return (u << 8) + c[1];
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54 }
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55
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56 static int
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57 dns_resolve(char *domain, int type, gboolean do_search)
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58 {
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59 int n;
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60 int i;
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61
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62 int resp_len;
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63 /*errno = 0; */
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64
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65 /*
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66 if (!stralloc_copy(&glue,domain)) return DNS_MEM;
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67 if (!stralloc_0(&glue)) return DNS_MEM;
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68 */
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69
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70 // resp_len = res_query(domain, C_IN, type, response.buf, sizeof(response));
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71 DEBUG(5) debugf("DNS: before res_search()\n");
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72 if (do_search)
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73 resp_len = res_search(domain, C_IN, type, response.buf, sizeof(response));
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74 else
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75 resp_len = res_query(domain, C_IN, type, response.buf, sizeof(response));
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76 DEBUG(5) debugf("DBG: after res_search()\n");
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77
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78 if (resp_len <= 0) {
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79 /*
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80 if (errno == ECONNREFUSED) return DNS_SOFT;
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81 if (h_errno == TRY_AGAIN) return DNS_SOFT;
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82 return DNS_HARD;
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83 */
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84 return -1;
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85 }
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86 if (resp_len >= sizeof(response))
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87 resp_len = sizeof(response);
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88
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89 resp_end = response.buf + resp_len;
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90 resp_pos = response.buf + sizeof(HEADER);
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91 n = ntohs(response.hdr.qdcount);
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92
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93 while (n-- > 0) {
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94 i = dn_expand(response.buf, resp_end, resp_pos, name, MAX_DNSNAME);
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95 if (i < 0)
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96 return -1;
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97 DEBUG(5) debugf("DBG: resolve name = %s\n", name);
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98 resp_pos += i;
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99 i = resp_end - resp_pos;
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100 if (i < QFIXEDSZ)
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101 return -1;
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102 resp_pos += QFIXEDSZ;
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103 }
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104 num_answers = ntohs(response.hdr.ancount);
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105
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106 return 0;
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107 }
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108
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109 static int
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110 dns_next()
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111 {
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112 int i;
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113
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114 if (num_answers <= 0)
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115 return 2;
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116 num_answers--;
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117
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118 if (resp_pos == resp_end)
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119 return -1; /* soft */
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120
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121 i = dn_expand(response.buf, resp_end, resp_pos, name, 256);
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122 if (i < 0)
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123 return -1; /* soft */
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124 resp_pos += i;
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125
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126 i = resp_end - resp_pos;
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127 if (i < 4 + 3 * 2)
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128 return -1; /* soft */
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129
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130 rr_type = getshort(resp_pos);
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131 rr_dlen = getshort(resp_pos + 8);
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132 resp_pos += 10;
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133
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134 return 0;
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135 }
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136
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137 static int
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138 dns_getip(guint32 * ip)
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139 {
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140 int ret;
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141
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142 if ((ret = dns_next()))
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143 return ret;
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144
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145 if (rr_type == T_A) {
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146 if (rr_dlen < 4)
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147 return -1; /* soft */
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148 *ip = *(guint32 *) (resp_pos);
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149 DEBUG(5) debugf("DNS: dns_getip(): ip = %s\n", inet_ntoa(*(struct in_addr *) ip));
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diff changeset
150 resp_pos += rr_dlen;
0
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parents:
diff changeset
151
10
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diff changeset
152 return 1;
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meillo@marmaro.de
parents: 0
diff changeset
153 }
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parents: 0
diff changeset
154 resp_pos += rr_dlen;
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parents: 0
diff changeset
155 return 0;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
156 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
157
10
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diff changeset
158 static int
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parents: 0
diff changeset
159 dns_getmx(int *pref)
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
160 {
10
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meillo@marmaro.de
parents: 0
diff changeset
161 int ret;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
162
10
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meillo@marmaro.de
parents: 0
diff changeset
163 if ((ret = dns_next()))
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meillo@marmaro.de
parents: 0
diff changeset
164 return ret;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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165
10
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meillo@marmaro.de
parents: 0
diff changeset
166 if (rr_type == T_MX) {
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meillo@marmaro.de
parents: 0
diff changeset
167 if (rr_dlen < 3)
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meillo@marmaro.de
parents: 0
diff changeset
168 return -1; /* soft */
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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169
10
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170 *pref = (resp_pos[0] << 8) + resp_pos[1];
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parents: 0
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171 if (dn_expand(response.buf, resp_end, resp_pos + 2, name, MAX_DNSNAME) < 0)
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172 return -1;
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parents: 0
diff changeset
173
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diff changeset
174 resp_pos += rr_dlen;
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parents: 0
diff changeset
175
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parents: 0
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176 return 1;
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parents: 0
diff changeset
177 }
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178 resp_pos += rr_dlen;
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179 return 0;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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180 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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181
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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182 /*
10
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183 static int
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184 dns_getname(int type)
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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185 {
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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186 int ret;
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meillo@marmaro.de
parents:
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187
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meillo@marmaro.de
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188 if((ret = dns_next())) return ret;
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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189
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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190 if (rr_type == type){
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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191 if (dn_expand(response.buf, resp_end, resp_pos, name, MAX_DNSNAME) < 0)
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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parents:
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192 return -1;
10
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diff changeset
193
0
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parents:
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194 resp_pos += rr_dlen;
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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195
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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196 return 1;
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meillo@marmaro.de
parents:
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197 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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198 resp_pos += rr_dlen;
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meillo@marmaro.de
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199 return 0;
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meillo@marmaro.de
parents:
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200 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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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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diff changeset
203 static int
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204 dns_look_ip(gchar * domain, guint32 * ip)
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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205 {
10
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206 gchar *n = domain;
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parents: 0
diff changeset
207
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parents: 0
diff changeset
208 while (TRUE) {
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parents: 0
diff changeset
209 if (dns_resolve(n, T_A, FALSE) == 0) {
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parents: 0
diff changeset
210 dns_next();
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parents: 0
diff changeset
211 if (rr_type == T_A) {
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meillo@marmaro.de
parents: 0
diff changeset
212 if (rr_dlen < 4)
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meillo@marmaro.de
parents: 0
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213 return -1; /* soft */
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parents: 0
diff changeset
214 *ip = *(guint32 *) (resp_pos);
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parents: 0
diff changeset
215
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diff changeset
216 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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217
10
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218 resp_pos += rr_dlen;
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parents: 0
diff changeset
219 return 0;
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meillo@marmaro.de
parents: 0
diff changeset
220 } else if (rr_type == T_CNAME) {
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parents: 0
diff changeset
221 if (dn_expand(response.buf, resp_end, resp_pos, name, MAX_DNSNAME) < 0)
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parents: 0
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222 return -1;
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parents: 0
diff changeset
223
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parents: 0
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224 DEBUG(5) debugf("DNS: (CNAME) dns_look_ip(): name = %s\n", name);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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225
10
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226 resp_pos += rr_dlen;
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227 n = name;
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parents: 0
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228 } else
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229 return -1;
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parents: 0
diff changeset
230 } else
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231 return -1;
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parents: 0
diff changeset
232 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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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_a(GList * list, gchar * domain)
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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237 {
10
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238 int ret;
0
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239
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240 DEBUG(5) debugf("DNS: resolve_dns_a entered\n");
0
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241
10
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parents: 0
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242 if (dns_resolve(domain, T_A, TRUE) == 0) {
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meillo@marmaro.de
parents: 0
diff changeset
243 mxip_addr mxip;
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parents: 0
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244 while ((ret = dns_getip(&(mxip.ip))) != 2) {
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parents: 0
diff changeset
245 if (ret == 1) {
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diff changeset
246 mxip.name = g_strdup(name);
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parents: 0
diff changeset
247 mxip.pref = 0;
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248 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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249 }
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250 }
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meillo@marmaro.de
parents: 0
diff changeset
251 }
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meillo@marmaro.de
parents: 0
diff changeset
252 return list;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
253 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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254
10
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diff changeset
255 static gint
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parents: 0
diff changeset
256 _mx_sort_func(gconstpointer aa, gconstpointer bb)
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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parents:
diff changeset
257 {
10
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258 const mxip_addr *a = (mxip_addr *) aa;
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diff changeset
259 const mxip_addr *b = (mxip_addr *) bb;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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parents:
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260
10
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meillo@marmaro.de
parents: 0
diff changeset
261 if (a->pref == b->pref)
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meillo@marmaro.de
parents: 0
diff changeset
262 return a->ip - b->ip;
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meillo@marmaro.de
parents: 0
diff changeset
263 else
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meillo@marmaro.de
parents: 0
diff changeset
264 return a->pref - b->pref;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
265 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
266
10
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parents: 0
diff changeset
267 GList*
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meillo@marmaro.de
parents: 0
diff changeset
268 resolve_dns_mx(GList * list, gchar * domain)
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
269 {
10
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meillo@marmaro.de
parents: 0
diff changeset
270 GList *node;
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meillo@marmaro.de
parents: 0
diff changeset
271 int ret;
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meillo@marmaro.de
parents: 0
diff changeset
272 int cnt = 0;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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diff changeset
273
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diff changeset
274 DEBUG(5) debugf("DNS: resolve_dns_mx entered\n");
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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parents:
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275
10
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meillo@marmaro.de
parents: 0
diff changeset
276 if (dns_resolve(domain, T_MX, TRUE) == 0) {
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meillo@marmaro.de
parents: 0
diff changeset
277 GList *node_next;
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meillo@marmaro.de
parents: 0
diff changeset
278 mxip_addr mxip;
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meillo@marmaro.de
parents: 0
diff changeset
279 while ((ret = dns_getmx(&(mxip.pref))) != 2) {
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meillo@marmaro.de
parents: 0
diff changeset
280 if (ret == 1) {
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meillo@marmaro.de
parents: 0
diff changeset
281 mxip.name = g_strdup(name);
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meillo@marmaro.de
parents: 0
diff changeset
282 mxip.ip = rand();
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meillo@marmaro.de
parents: 0
diff changeset
283 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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meillo@marmaro.de
parents: 0
diff changeset
284 cnt++;
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meillo@marmaro.de
parents: 0
diff changeset
285 }
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meillo@marmaro.de
parents: 0
diff changeset
286 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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287
10
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meillo@marmaro.de
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diff changeset
288 DEBUG(5) debugf("DNS: found %d mx records\n", cnt);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
289
10
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meillo@marmaro.de
parents: 0
diff changeset
290 /* to randomize sequences with equal pref values,
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meillo@marmaro.de
parents: 0
diff changeset
291 we temporarily 'misused' the ip field and
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meillo@marmaro.de
parents: 0
diff changeset
292 put a random number in it as a secondary sort key.
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meillo@marmaro.de
parents: 0
diff changeset
293 */
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meillo@marmaro.de
parents: 0
diff changeset
294 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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295
10
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meillo@marmaro.de
parents: 0
diff changeset
296 /* CNAME resolving has to be added as well. */
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
297
10
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meillo@marmaro.de
parents: 0
diff changeset
298 for (node = g_list_first(list); node != NULL; node = node_next) {
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
299
10
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parents: 0
diff changeset
300 mxip_addr *p_mxip = (mxip_addr *) (node->data);
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meillo@marmaro.de
parents: 0
diff changeset
301 node_next = g_list_next(node);
0
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302
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303 if (dns_look_ip(p_mxip->name, &(p_mxip->ip)) != 0) {
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304 DEBUG(1) debugf("DNS: could not resolve target of mx %s\n", p_mxip->name);
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305 list = g_list_remove_link(list, node);
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306 g_free(node->data);
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307 g_list_free_1(node);
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308 }
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309 }
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310 }
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311 return list;
0
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312 }
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313
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314 #endif
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315
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316 /* now something completely different... */
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317
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318 GList*
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319 resolve_byname(GList * list, gchar * domain)
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320 {
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321 struct hostent *hent;
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322
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323 DEBUG(5) debugf("DNS: resolve_byname entered\n");
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324
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325 if ((hent = gethostbyname(domain))) {
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326 char *haddr;
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327 int i = 0;
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328 while ((haddr = hent->h_addr_list[i++])) {
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329 mxip_addr mxip;
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330 mxip.ip = *(guint32 *) (haddr);
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331 mxip.pref = 0;
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332 mxip.name = g_strdup(hent->h_name);
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333 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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334 }
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335 }
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336 return list;
0
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337 }
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338
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339 #ifdef RESOLV_TEST
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340 int
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341 main(int argc, char *argv[])
0
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342 {
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343 GList *addr_list = NULL, *node;
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344
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345 g_print("starting res_init()\n");
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346
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347 g_print("retrans = %d, retry = %d\n", _res.retrans, _res.retry);
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348
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349 if (res_init() == 0) {
0
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350
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351 addr_list = resolve_dns_a(NULL, argv[1]);
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352 g_print("A:\n");
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353
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354 foreach(addr_list, node) {
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355 mxip_addr *p_mxip = (mxip_addr *) (node->data);
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356
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357 printf("name = %s\n IP = %s\n", p_mxip->name, inet_ntoa(*(struct in_addr *) &(p_mxip->ip)));
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358 }
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359 addr_list = resolve_dns_mx(NULL, argv[1]);
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360 g_print("MX:\n");
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361
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362 foreach(addr_list, node) {
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363 mxip_addr *p_mxip = (mxip_addr *) (node->data);
0
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364
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365 printf("name = %s\n IP = %s pref = %d\n", p_mxip->name, inet_ntoa(*(struct in_addr *) &(p_mxip->ip)), p_mxip->pref);
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366 }
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367 {
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368 guint32 ip;
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369 dns_look_ip(argv[1], &ip);
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370 printf("dns_look_ip: %s\n", inet_ntoa(*((struct in_addr *) (&ip))));
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371 }
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372 } else
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373 printf("res_init() failed.\n");
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374
0
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375 }
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376 #endif