Mercurial > masqmail

annotate src/lookup.c @ 91:3e7136221104

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correct masqmail path in rmail script; remove docs on uninstall on install the correct path to the masqmail executable gets inserted into the rmail script now. now documentation, examples, and the templates are removed on uninstall. Empty directories are the only thing that may remain if one installs masqmail into an unusual path.
author meillo@marmaro.de
date Mon, 21 Jun 2010 09:40:16 +0200
parents f671821d8222
children 116b0269c934
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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
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 *
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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 #ifdef RESOLV_TEST
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26 #undef DEBUG
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27 #define DEBUG(x) if(x > 0)
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28 #define debugf g_print
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29 #endif
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30
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31 #ifdef ENABLE_RESOLVER
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32
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33 static union {
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34 HEADER hdr;
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35 unsigned char buf[PACKETSZ];
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36 } response;
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37 static unsigned char *resp_end;
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38 static unsigned char *resp_pos;
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39
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40 static int num_answers;
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41 static char name[MAX_DNSNAME];
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42
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43 unsigned short rr_type;
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44 unsigned short rr_dlen;
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45
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46 static unsigned short
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47 getshort(unsigned char *c)
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48 {
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49 unsigned short u;
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50 u = c[0];
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51 return (u << 8) + c[1];
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52 }
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53
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54 static int
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55 dns_resolve(char *domain, int type, gboolean do_search)
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56 {
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57 int n;
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58 int i;
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59
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60 int resp_len;
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61 /*errno = 0; */
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62
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63 /*
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64 if (!stralloc_copy(&glue,domain)) return DNS_MEM;
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65 if (!stralloc_0(&glue)) return DNS_MEM;
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66 */
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67
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68 // resp_len = res_query(domain, C_IN, type, response.buf, sizeof(response));
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69 DEBUG(5) debugf("DNS: before res_search()\n");
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70 if (do_search)
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71 resp_len = res_search(domain, C_IN, type, response.buf, sizeof(response));
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72 else
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73 resp_len = res_query(domain, C_IN, type, response.buf, sizeof(response));
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74 DEBUG(5) debugf("DBG: after res_search()\n");
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75
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76 if (resp_len <= 0) {
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77 /*
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78 if (errno == ECONNREFUSED) return DNS_SOFT;
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79 if (h_errno == TRY_AGAIN) return DNS_SOFT;
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80 return DNS_HARD;
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81 */
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82 return -1;
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83 }
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84 if (resp_len >= sizeof(response))
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85 resp_len = sizeof(response);
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86
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87 resp_end = response.buf + resp_len;
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88 resp_pos = response.buf + sizeof(HEADER);
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89 n = ntohs(response.hdr.qdcount);
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90
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91 while (n-- > 0) {
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92 i = dn_expand(response.buf, resp_end, resp_pos, name, MAX_DNSNAME);
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93 if (i < 0)
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94 return -1;
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95 DEBUG(5) debugf("DBG: resolve name = %s\n", name);
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96 resp_pos += i;
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97 i = resp_end - resp_pos;
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98 if (i < QFIXEDSZ)
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99 return -1;
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100 resp_pos += QFIXEDSZ;
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101 }
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102 num_answers = ntohs(response.hdr.ancount);
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103
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104 return 0;
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105 }
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106
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107 static int
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108 dns_next()
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109 {
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110 int i;
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111
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112 if (num_answers <= 0)
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113 return 2;
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114 num_answers--;
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115
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116 if (resp_pos == resp_end)
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117 return -1; /* soft */
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118
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119 i = dn_expand(response.buf, resp_end, resp_pos, name, 256);
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120 if (i < 0)
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121 return -1; /* soft */
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122 resp_pos += i;
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123
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124 i = resp_end - resp_pos;
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125 if (i < 4 + 3 * 2)
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126 return -1; /* soft */
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127
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128 rr_type = getshort(resp_pos);
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129 rr_dlen = getshort(resp_pos + 8);
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130 resp_pos += 10;
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131
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132 return 0;
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133 }
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134
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135 static int
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136 dns_getip(guint32 * ip)
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137 {
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138 int ret;
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139
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140 if ((ret = dns_next()))
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141 return ret;
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142
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143 if (rr_type == T_A) {
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144 if (rr_dlen < 4)
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145 return -1; /* soft */
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146 *ip = *(guint32 *) (resp_pos);
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147 DEBUG(5) debugf("DNS: dns_getip(): ip = %s\n", inet_ntoa(*(struct in_addr *) ip));
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148 resp_pos += rr_dlen;
0
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149
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150 return 1;
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parents: 0
diff changeset
151 }
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152 resp_pos += rr_dlen;
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diff changeset
153 return 0;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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154 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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155
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diff changeset
156 static int
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diff changeset
157 dns_getmx(int *pref)
0
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meillo@marmaro.de
parents:
diff changeset
158 {
10
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diff changeset
159 int ret;
0
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parents:
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160
10
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parents: 0
diff changeset
161 if ((ret = dns_next()))
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parents: 0
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162 return ret;
0
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parents:
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163
10
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parents: 0
diff changeset
164 if (rr_type == T_MX) {
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parents: 0
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165 if (rr_dlen < 3)
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parents: 0
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166 return -1; /* soft */
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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parents:
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167
10
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168 *pref = (resp_pos[0] << 8) + resp_pos[1];
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parents: 0
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169 if (dn_expand(response.buf, resp_end, resp_pos + 2, name, MAX_DNSNAME) < 0)
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170 return -1;
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parents: 0
diff changeset
171
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172 resp_pos += rr_dlen;
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diff changeset
173
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174 return 1;
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parents: 0
diff changeset
175 }
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176 resp_pos += rr_dlen;
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177 return 0;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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178 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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179
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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180 /*
10
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181 static int
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182 dns_getname(int type)
0
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183 {
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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184 int ret;
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meillo@marmaro.de
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185
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186 if((ret = dns_next())) return ret;
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parents:
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187
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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188 if (rr_type == type){
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189 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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190 return -1;
10
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diff changeset
191
0
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parents:
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192 resp_pos += rr_dlen;
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meillo@marmaro.de
parents:
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193
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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194 return 1;
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meillo@marmaro.de
parents:
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195 }
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meillo@marmaro.de
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196 resp_pos += rr_dlen;
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197 return 0;
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meillo@marmaro.de
parents:
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198 }
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meillo@marmaro.de
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199 */
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200
10
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201 static int
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202 dns_look_ip(gchar * domain, guint32 * ip)
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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203 {
10
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204 gchar *n = domain;
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205
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parents: 0
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206 while (TRUE) {
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207 if (dns_resolve(n, T_A, FALSE) == 0) {
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parents: 0
diff changeset
208 dns_next();
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parents: 0
diff changeset
209 if (rr_type == T_A) {
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parents: 0
diff changeset
210 if (rr_dlen < 4)
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parents: 0
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211 return -1; /* soft */
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diff changeset
212 *ip = *(guint32 *) (resp_pos);
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diff changeset
213
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214 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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215
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216 resp_pos += rr_dlen;
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parents: 0
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217 return 0;
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parents: 0
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218 } else if (rr_type == T_CNAME) {
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219 if (dn_expand(response.buf, resp_end, resp_pos, name, MAX_DNSNAME) < 0)
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220 return -1;
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parents: 0
diff changeset
221
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222 DEBUG(5) debugf("DNS: (CNAME) dns_look_ip(): name = %s\n", name);
0
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223
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224 resp_pos += rr_dlen;
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225 n = name;
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226 } else
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227 return -1;
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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
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230 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
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231 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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232
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233 GList*
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234 resolve_dns_a(GList * list, gchar * domain)
0
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235 {
10
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236 int ret;
0
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237
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238 DEBUG(5) debugf("DNS: resolve_dns_a entered\n");
0
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239
10
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240 if (dns_resolve(domain, T_A, TRUE) == 0) {
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diff changeset
241 mxip_addr mxip;
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242 while ((ret = dns_getip(&(mxip.ip))) != 2) {
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parents: 0
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243 if (ret == 1) {
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diff changeset
244 mxip.name = g_strdup(name);
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245 mxip.pref = 0;
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246 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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247 }
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248 }
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parents: 0
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249 }
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meillo@marmaro.de
parents: 0
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250 return list;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
251 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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252
10
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diff changeset
253 static gint
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254 _mx_sort_func(gconstpointer aa, gconstpointer bb)
0
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255 {
10
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256 const mxip_addr *a = (mxip_addr *) aa;
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257 const mxip_addr *b = (mxip_addr *) bb;
0
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parents:
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258
10
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meillo@marmaro.de
parents: 0
diff changeset
259 if (a->pref == b->pref)
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parents: 0
diff changeset
260 return a->ip - b->ip;
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meillo@marmaro.de
parents: 0
diff changeset
261 else
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meillo@marmaro.de
parents: 0
diff changeset
262 return a->pref - b->pref;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
263 }
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
264
10
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parents: 0
diff changeset
265 GList*
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meillo@marmaro.de
parents: 0
diff changeset
266 resolve_dns_mx(GList * list, gchar * domain)
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
267 {
10
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parents: 0
diff changeset
268 GList *node;
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meillo@marmaro.de
parents: 0
diff changeset
269 int ret;
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meillo@marmaro.de
parents: 0
diff changeset
270 int cnt = 0;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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271
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272 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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273
10
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meillo@marmaro.de
parents: 0
diff changeset
274 if (dns_resolve(domain, T_MX, TRUE) == 0) {
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meillo@marmaro.de
parents: 0
diff changeset
275 GList *node_next;
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meillo@marmaro.de
parents: 0
diff changeset
276 mxip_addr mxip;
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meillo@marmaro.de
parents: 0
diff changeset
277 while ((ret = dns_getmx(&(mxip.pref))) != 2) {
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meillo@marmaro.de
parents: 0
diff changeset
278 if (ret == 1) {
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parents: 0
diff changeset
279 mxip.name = g_strdup(name);
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meillo@marmaro.de
parents: 0
diff changeset
280 mxip.ip = rand();
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281 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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parents: 0
diff changeset
282 cnt++;
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meillo@marmaro.de
parents: 0
diff changeset
283 }
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meillo@marmaro.de
parents: 0
diff changeset
284 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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285
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meillo@marmaro.de
parents: 0
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286 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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287
10
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meillo@marmaro.de
parents: 0
diff changeset
288 /* to randomize sequences with equal pref values,
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meillo@marmaro.de
parents: 0
diff changeset
289 we temporarily 'misused' the ip field and
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meillo@marmaro.de
parents: 0
diff changeset
290 put a random number in it as a secondary sort key.
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meillo@marmaro.de
parents: 0
diff changeset
291 */
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meillo@marmaro.de
parents: 0
diff changeset
292 list = g_list_sort(list, _mx_sort_func);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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parents:
diff changeset
293
10
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meillo@marmaro.de
parents: 0
diff changeset
294 /* CNAME resolving has to be added as well. */
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
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diff changeset
295
10
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meillo@marmaro.de
parents: 0
diff changeset
296 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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297
10
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diff changeset
298 mxip_addr *p_mxip = (mxip_addr *) (node->data);
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parents: 0
diff changeset
299 node_next = g_list_next(node);
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
meillo@marmaro.de
parents:
diff changeset
300
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301 if (dns_look_ip(p_mxip->name, &(p_mxip->ip)) != 0) {
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302 DEBUG(1) debugf("DNS: could not resolve target of mx %s\n", p_mxip->name);
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303 list = g_list_remove_link(list, node);
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304 g_free(node->data);
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305 g_list_free_1(node);
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306 }
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307 }
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308 }
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309 return list;
0
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310 }
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311
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312 #endif
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313
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314 /* now something completely different... */
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315
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316 GList*
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317 resolve_byname(GList * list, gchar * domain)
0
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318 {
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319 struct hostent *hent;
0
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320
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321 DEBUG(5) debugf("DNS: resolve_byname entered\n");
0
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322
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323 if ((hent = gethostbyname(domain))) {
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324 char *haddr;
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325 int i = 0;
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326 while ((haddr = hent->h_addr_list[i++])) {
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327 mxip_addr mxip;
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328 mxip.ip = *(guint32 *) (haddr);
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329 mxip.pref = 0;
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330 mxip.name = g_strdup(hent->h_name);
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331 list = g_list_append(list, g_memdup(&mxip, sizeof(mxip)));
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332 }
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333 }
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334 return list;
0
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335 }
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336
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337 #ifdef RESOLV_TEST
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338 int
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339 main(int argc, char *argv[])
0
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340 {
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341 GList *addr_list = NULL, *node;
0
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342
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343 g_print("starting res_init()\n");
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344 g_print("retrans = %d, retry = %d\n", _res.retrans, _res.retry);
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345 if (res_init() == 0) {
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346 addr_list = resolve_dns_a(NULL, argv[1]);
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347 g_print("A:\n");
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348 foreach(addr_list, node) {
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349 mxip_addr *p_mxip = (mxip_addr *) (node->data);
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350 printf("name = %s\n IP = %s\n", p_mxip->name, inet_ntoa(*(struct in_addr *) &(p_mxip->ip)));
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351 }
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352 addr_list = resolve_dns_mx(NULL, argv[1]);
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353 g_print("MX:\n");
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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 printf("name = %s\n IP = %s pref = %d\n", p_mxip->name,
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357 inet_ntoa(*(struct in_addr *) &(p_mxip->ip)), p_mxip->pref);
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358 }
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359 {
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360 guint32 ip;
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361 dns_look_ip(argv[1], &ip);
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362 printf("dns_look_ip: %s\n", inet_ntoa(*((struct in_addr *) (&ip))));
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363 }
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364 } else
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365 printf("res_init() failed.\n");
0
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366 }
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367 #endif