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annotate packages/net/ns/dns/current/src/dns.c @ 1692:f7cb1caf8d2a

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* src/dns.c (cyg_dns_getnameinfo): And another typo
author asl
date Tue, 13 Jul 2004 20:59:54 +0000
parents c81db0785971
children e0d4cd2bcc2c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //=============================================================================
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2 //
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3 // dns.c
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4 //
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5 // DNS client code
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6 //
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7 //=============================================================================
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license/
208
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //=============================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): andrew.lunn
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44 // Contributors:andrew.lunn, jskov
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45 // Date: 2001-09-18
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46 // Description: Provides DNS lookup as per RFC 1034/1035.
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47 //
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48 // Note: Does only support A and PTR lookups. Maybe add for other
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49 // types as well?
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50 //
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51 // parse_answer() only returns the first found record.
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52 //
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53 // Add tracing and assertions.
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54 //
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55 //####DESCRIPTIONEND####
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56 //
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57 //=============================================================================
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58
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59 #include <pkgconf/system.h>
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60 #ifdef CYGPKG_KERNEL
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61 # include <pkgconf/kernel.h>
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62 # include <cyg/kernel/kapi.h>
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63 #endif
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64 #include <cyg/hal/drv_api.h>
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65 #include <cyg/infra/cyg_type.h>
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66 #include <cyg/infra/cyg_trac.h> /* Tracing support */
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67
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68 #include <netdb.h>
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69
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70 #include <sys/time.h>
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71 #include <sys/types.h>
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72 #include <sys/socket.h>
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73 #include <arpa/inet.h>
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74
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75 #include <ctype.h>
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76 #include <unistd.h>
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77 #include <stdio.h>
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78 #include <string.h>
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79 #include <stdlib.h>
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80
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81 #include <cyg/ns/dns/dns_priv.h>
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82
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83 static short id = 0; /* ID of the last query */
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84 static int s = -1; /* Socket to the DNS server */
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85 static cyg_drv_mutex_t dns_mutex; /* Mutex to stop multiple queries as once */
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86 static cyg_ucount32 ptdindex; /* Index for the per thread data */
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87 static char * domainname=NULL; /* Domain name used for queries */
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88
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89 /* Allocate space for string of length len. Return NULL on failure. */
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90 static inline char*
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91 alloc_string(int len)
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92 {
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93 return malloc(len);
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94 }
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95
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96 static inline void
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97 free_string(char* s)
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98 {
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99 free(s);
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100 }
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101
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102 /* Deallocate the memory taken to hold a hent structure */
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103 static void
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104 free_hent(struct hostent * hent)
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105 {
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106 if (hent->h_name) {
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107 free_string(hent->h_name);
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108 }
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109
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110 if (hent->h_addr_list) {
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111 int i = 0;
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112 while (hent->h_addr_list[i]) {
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113 free(hent->h_addr_list[i]);
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114 i++;
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115 }
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116 free(hent->h_addr_list);
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117 }
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118 free(hent);
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119 }
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120
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121 /* Allocate hent structure with room for one in_addr. Returns NULL on
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122 failure. */
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123 static struct hostent*
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124 alloc_hent(void)
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125 {
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126 struct hostent *hent;
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127
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128 hent = malloc(sizeof(struct hostent));
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129 if (hent) {
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130 memset(hent, 0, sizeof(struct hostent));
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131 hent->h_addr_list = malloc(sizeof(char *)*2);
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132 if (!hent->h_addr_list) {
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133 free_hent(hent);
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134 return NULL;
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135 }
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136 hent->h_addr_list[0] = malloc(sizeof(struct in_addr));
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137 if (!hent->h_addr_list[0]) {
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138 free_hent(hent);
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139 return NULL;
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140 }
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141 hent->h_addr_list[1] = NULL;
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142 }
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143
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144 return hent;
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145 }
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146
210
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147 /* Thread destructor used to free stuff stored in per-thread data slot. */
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148 static void
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149 thread_destructor(CYG_ADDRWORD data)
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150 {
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151 struct hostent *hent;
212
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152 hent = (struct hostent *)cyg_thread_get_data(ptdindex);
210
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153 if (hent)
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154 free_hent(hent);
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155 return;
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156 data=data;
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157 }
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158
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159 /* Store the hent away in the per-thread data. */
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160 static void
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161 store_hent(struct hostent *hent)
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162 {
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163 // Prevent memory leaks by setting a destructor to be
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164 // called on thread exit to free per-thread data.
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165 cyg_thread_add_destructor( &thread_destructor, 0 );
212
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166 cyg_thread_set_data(ptdindex, (CYG_ADDRWORD)hent);
210
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167 }
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168
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169 /* If there is an answer to an old query, free the memory it uses. */
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170 static void
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171 free_stored_hent(void)
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172 {
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173 struct hostent *hent;
212
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174 hent = (struct hostent *)cyg_thread_get_data(ptdindex);
210
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175 if (hent) {
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176 free_hent(hent);
212
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177 cyg_thread_set_data(ptdindex, (CYG_ADDRWORD)NULL);
210
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178 cyg_thread_rem_destructor( &thread_destructor, 0 );
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179 }
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180 }
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181
208
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182 /* Send the query to the server and read the response back. Return -1
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183 if it fails, otherwise put the response back in msg and return the
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184 length of the response. */
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185 static int
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186 send_recv(char * msg, int len, int msglen)
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187 {
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188 struct dns_header *dns_hdr;
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189 struct timeval timeout;
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190 int finished = false;
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191 int backoff = 1;
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192 fd_set readfds;
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193 int written;
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194 int ret;
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195
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196 CYG_REPORT_FUNCNAMETYPE( "send_recv", "returning %d" );
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197 CYG_REPORT_FUNCARG3( "msg=%08x, len=%d, msglen", msg, len, msglen );
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198
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199 CYG_CHECK_DATA_PTR( msg, "msg is not a valid pointer!" );
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200
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201 dns_hdr = (struct dns_header *) msg;
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202
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203 do {
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204 written = write(s, msg, len);
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205 if (written < 0) {
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206 ret = -1;
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207 break;
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208 }
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209
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210 FD_ZERO(&readfds);
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211 FD_SET(s, &readfds);
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212
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213 timeout.tv_sec = backoff;
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214 timeout.tv_usec = 0;
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215 backoff = backoff << 1;
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216
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217 ret = select(s+1, &readfds, NULL, NULL, &timeout);
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218 if (ret < 0) {
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219 ret = -1;
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220 break;
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221 }
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222 /* Timeout */
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223 if (ret == 0) {
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224 if (backoff > 16) {
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225 h_errno = TRY_AGAIN;
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226 ret = -1;
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227 break;
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228 }
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229 }
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230 if (ret == 1) {
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231 ret = read(s, msg, msglen);
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232 if (ret < 0) {
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233 ret = -1;
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234 break;
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235 }
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236
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237 /* Reply to an old query. Ignore it */
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238 if (ntohs(dns_hdr->id) != (id-1)) {
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239 continue;
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240 }
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241 finished = true;
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242 }
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243 } while (!finished);
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244
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245 CYG_REPORT_RETVAL( ret );
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246
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247 return ret;
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248 }
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249
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250 /* Include the DNS client implementation code */
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251 #include <cyg/ns/dns/dns_impl.inl>
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252
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253 /* (re)Start the DNS client. This opens a socket to the DNS server
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254 who's address is passed in. This address can be either an IPv4 or
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255 IPv6 address. This function can be called multiple times. If we
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256 are being called a second time we have to be careful to allow any
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257 ongoing lookups to finish before we close the socket and connect to
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258 a different DNS server. The danger here is that we may have to wait
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259 for up to 32 seconds if the DNS server is down.
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260 Each invocation will close any previous connection and make a new
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261 connection to the new server. Note the address of the server must
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262 be in numeric form since its not possible to do a DNS lookup! */
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263
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264 int cyg_dns_res_start(char * dns_server) {
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265
208
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266 static int init =0;
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267 struct addrinfo * res;
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268 int err;
208
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269
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270 CYG_REPORT_FUNCNAMETYPE( "cyg_dns_res_start", "returning %d" );
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271 CYG_REPORT_FUNCARG1( "dns_server=%s", dns_server );
208
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272
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273 CYG_CHECK_DATA_PTR( dns_server, "dns_server is not a valid pointer!" );
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274
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275 if (init) {
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276 cyg_drv_mutex_lock(&dns_mutex);
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277 cyg_thread_free_data_index(ptdindex);
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278 if (s >= 0) {
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279 close(s);
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280 }
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281 } else {
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282 init = 1;
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283 cyg_drv_mutex_init(&dns_mutex);
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284 cyg_drv_mutex_lock(&dns_mutex);
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jlarmour
parents:
diff changeset
285 }
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jlarmour
parents:
diff changeset
286
1040
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
287 err = getaddrinfo(dns_server,"domain", NULL, &res);
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
288 if (err != 0) {
208
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jlarmour
parents:
diff changeset
289 cyg_drv_mutex_unlock(&dns_mutex);
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parents:
diff changeset
290 CYG_REPORT_RETVAL( -1 );
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jlarmour
parents:
diff changeset
291 return -1;
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jlarmour
parents:
diff changeset
292 }
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jlarmour
parents:
diff changeset
293
1040
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
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parents: 1005
diff changeset
294 s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
295 if (s == -1) {
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
296 cyg_drv_mutex_unlock(&dns_mutex);
1040
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
297 freeaddrinfo(res);
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
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parents:
diff changeset
298 CYG_REPORT_RETVAL( -1 );
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jlarmour
parents:
diff changeset
299 return -1;
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jlarmour
parents:
diff changeset
300 }
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jlarmour
parents:
diff changeset
301
1040
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
302 if (connect(s, res->ai_addr, res->ai_addrlen) < 0) {
208
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jlarmour
parents:
diff changeset
303 s = -1;
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jlarmour
parents:
diff changeset
304 cyg_drv_mutex_unlock(&dns_mutex);
1040
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
305 freeaddrinfo(res);
208
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jlarmour
parents:
diff changeset
306 CYG_REPORT_RETVAL( -1 );
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jlarmour
parents:
diff changeset
307 return -1;
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jlarmour
parents:
diff changeset
308 }
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jlarmour
parents:
diff changeset
309 ptdindex = cyg_thread_new_data_index();
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jlarmour
parents:
diff changeset
310
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parents:
diff changeset
311 cyg_drv_mutex_unlock(&dns_mutex);
1040
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
312 freeaddrinfo(res);
208
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parents:
diff changeset
313 CYG_REPORT_RETVAL( 0 );
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jlarmour
parents:
diff changeset
314 return 0;
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jlarmour
parents:
diff changeset
315 }
1005
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
316
1040
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
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parents: 1005
diff changeset
317 /* This is the old interface to start the resolver. It is only IPv4
1069
edfa7bed5cb2 Pure pedantry: fix some typos in comments
jlarmour
parents: 1040
diff changeset
318 capable and so is now deprecated in favor of cyg_dns_res_start().
1040
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
319 Initialise the resolver. Open a socket and bind it to the
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
320 address of the server. return -1 if something goes wrong,
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
321 otherwise 0. If we are being called a second time we have to be
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
322 careful to allow any ongoing lookups to finish before we close the
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
323 socket and connect to a different DNS server. The danger here is
1069
edfa7bed5cb2 Pure pedantry: fix some typos in comments
jlarmour
parents: 1040
diff changeset
324 that we may have to wait for up to 32 seconds if the DNS server is
1040
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
325 down. */
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
326 int
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
327 cyg_dns_res_init(struct in_addr *dns_server)
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
328 {
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
329 char name[20];
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
330 unsigned char *bytes = (unsigned char *)dns_server;
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
331 int ret;
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
332
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
333 CYG_REPORT_FUNCNAMETYPE( "cyg_dns_res_init", "returning %d" );
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
334 CYG_REPORT_FUNCARG1( "dns_server=%08x", dns_server );
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
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diff changeset
335
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
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parents: 1005
diff changeset
336 diag_sprintf(name, "%d.%d.%d.%d", bytes[0], bytes[1], bytes[2], bytes[3]);
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
337
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
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diff changeset
338 ret = cyg_dns_res_start(name);
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
339
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
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diff changeset
340 CYG_REPORT_RETVAL( ret );
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
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diff changeset
341 return ret;
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
parents: 1005
diff changeset
342 }
1aaed612fe59 * src/dns.c: (cyg_dns_res_start) New: Allow IPv6 to be used to
asl
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diff changeset
343
1005
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
344 /* add_answer checks to see if we already have this answer and if not,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
345 adds it to the answers. */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
346 static int
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
347 add_answer(char *rdata, short rr_type, int family,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
348 struct sockaddr addrs[], int num, int used) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
349 int i;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
350 int found = 0;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
351
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
352 for (i = 0; i < used ; i++) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
353 if ((addrs[i].sa_family == family) &&
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
354 !memcmp(addrs[i].sa_data, rdata, addrs[i].sa_len)) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
355 found = 1;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
356 break;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
357 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
358 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
359 if (!found) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
360 memset(&addrs[used],0,sizeof(addrs[used]));
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
361 addrs[used].sa_family = family;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
362
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
363 switch(family) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
364 case AF_INET: {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
365 struct sockaddr_in * addr = (struct sockaddr_in *) &addrs[used];
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
366 addr->sin_len = sizeof(*addr);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
367 memcpy(&addr->sin_addr, rdata, sizeof(struct in_addr));
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
368 used++;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
369 break;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
370 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
371 #ifdef CYGPKG_NET_INET6
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
372 case AF_INET6: {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
373 struct sockaddr_in6 * addr = (struct sockaddr_in6 *) &addrs[used];
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
374 addr->sin6_len = sizeof(*addr);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
375 memcpy(&addr->sin6_addr, rdata, sizeof(struct in6_addr));
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
376 used++;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
377 break;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
378 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
379 #endif
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
380 default:
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
381 used = -EAI_FAMILY;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
382 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
383 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
384 return used;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
385 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
386
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
387 /* This decodes the answer and puts the results into the addrs
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
388 array. This function can deal with IPv6 AAAA records as well as A
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
389 records. Thus its more complex than the parse_answer function in
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
390 the inline code. This complexity is only needed by getaddrinfo, so
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
391 i decided to leave parse_anser alone. */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
392
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
393 static int
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
394 decode(char *msg, short rr_type, int family,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
395 struct sockaddr addrs[], int num, int used, char **canon) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
396
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
397 struct dns_header *dns_hdr;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
398 struct resource_record rr, *rr_p = NULL;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
399 char *qname = NULL;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
400 char *ptr;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
401
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
402 dns_hdr = (struct dns_header *)msg;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
403
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
404 if (DNS_REPLY_NAME_ERROR == dns_hdr->rcode) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
405 h_errno = HOST_NOT_FOUND;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
406 return -EAI_NONAME;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
407 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
408
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
409 if ((dns_hdr->qr != 1) ||
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
410 (dns_hdr->opcode != DNS_QUERY)) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
411 return -EAI_FAIL;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
412 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
413
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
414 if (dns_hdr->rcode != DNS_REPLY_NOERR) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
415 return -EAI_NONAME;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
416 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
417
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
418 dns_hdr->ancount = ntohs(dns_hdr->ancount);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
419 dns_hdr->qdcount = ntohs(dns_hdr->qdcount);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
420 ptr = (char *)&dns_hdr[1];
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
421
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
422 /* Skip over the query section */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
423 if (dns_hdr->qdcount > 0) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
424 while (dns_hdr->qdcount) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
425 ptr += qname_len(ptr);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
426 ptr += 4; /* skip type & class */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
427 dns_hdr->qdcount--;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
428 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
429 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
430
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
431 /* Read the answers resource records to find an answer of the
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
432 correct type. */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
433 while (dns_hdr->ancount && (used >= 0) && (used < num)) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
434 qname = ptr;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
435 ptr += qname_len(ptr);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
436 rr_p = (struct resource_record *)ptr;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
437 memcpy(&rr, ptr, sizeof(rr));
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
438 if ((rr.rr_type == htons(rr_type)) &&
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
439 (rr.class == htons(DNS_CLASS_IN))) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
440 used = add_answer(rr_p->rdata, rr_type, family, addrs, num, used);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
441 if (canon && !*canon) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
442 *canon = real_name(msg,qname);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
443 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
444 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
445 ptr += sizeof(struct resource_record) -
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
446 sizeof(rr.rdata) + ntohs(rr.rdlength);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
447 dns_hdr->ancount--;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
448 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
449 if (used == 0) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
450 return -EAI_NONAME;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
451 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
452 return used;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
453 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
454
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
455 /* Do a lookup for a particular type of resource record. */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
456 static int
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
457 do_lookup (const char * hostname,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
458 struct sockaddr addrs[], int num, int used,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
459 short rr_type, int family, char **canon) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
460
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
461 unsigned char msg[MAXDNSMSGSIZE];
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
462 int error;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
463 int len;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
464
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
465 /* First try the name as passed in */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
466 memset(msg, 0, sizeof(msg));
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
467 len = build_query(msg, hostname, rr_type);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
468 if (len < 0) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
469 return -EAI_FAIL;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
470 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
471
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
472 /* Send the query and wait for an answer */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
473 len = send_recv(msg, len, sizeof(msg));
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
474 if (len < 0) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
475 return -EAI_FAIL;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
476 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
477
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
478 /* Decode the answer */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
479 error = decode(msg, rr_type, family, addrs, num, used, canon);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
480 return error;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
481 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
482
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
483 static int do_lookups(const char * hostname,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
484 struct sockaddr addrs[], int num,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
485 int family, char ** canon) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
486 int error;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
487 #ifdef CYGPKG_NET_INET6
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
488 int error6;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
489 #endif
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
490
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
491 switch (family) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
492 case AF_INET:
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
493 error = do_lookup(hostname, addrs, num, 0, DNS_TYPE_A, AF_INET, canon);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
494 break;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
495 #ifdef CYGPKG_NET_INET6
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
496 case AF_INET6:
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
497 error = do_lookup(hostname, addrs, num, 0, DNS_TYPE_AAAA, AF_INET6, canon);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
498 break;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
499 #endif
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
500 case PF_UNSPEC:
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
501 #ifndef CYGPKG_NET_INET6
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
502 error = do_lookup(hostname, addrs, num, 0, DNS_TYPE_A, AF_INET, canon);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
503 #else
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
504 #ifdef CYGOPT_NS_DNS_FIRST_FAMILTY_AF_INET
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
505 error = do_lookup(hostname, addrs, num, 0, DNS_TYPE_A, AF_INET, canon);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
506 if (error > 0 ) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
507 error6 = do_lookup(hostname, addrs, num, error, DNS_TYPE_AAAA,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
508 AF_INET6, canon);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
509 } else {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
510 error6 = do_lookup(hostname, addrs, num, 0, DNS_TYPE_AAAA,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
511 AF_INET6, canon);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
512 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
513 if (error6 > 0) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
514 error = error6;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
515 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
516 #else // CYGOPT_NS_DNS_FIRST_FAMILY_AF_INET
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
517 error6 = do_lookup(hostname, addrs, num, 0, DNS_TYPE_AAAA,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
518 AF_INET6, canon);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
519 if (error6> 0 ) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
520 error = do_lookup(hostname, addrs, num, error6, DNS_TYPE_A,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
521 AF_INET, canon);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
522 } else {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
523 error = do_lookup(hostname, addrs, num, 0, DNS_TYPE_A,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
524 AF_INET, canon);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
525 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
526 #endif // CYGOPT_NS_DNS_FIRST_FAMILY_AF_INET
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
527 #endif // CYGPKG_NET_INET6
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
528 break;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
529 default:
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
530 error = -EAI_FAMILY;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
531 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
532 return error;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
533 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
534
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
535 /* This implements the interface between getaddrinfo and the dns
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
536 client. hostent is not used here since that only works with IPv4
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
537 addresses, where as this function needs to be protocol
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
538 independent. */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
539 int
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
540 cyg_dns_getaddrinfo(const char * hostname,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
541 struct sockaddr addrs[], int num,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
542 int family,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
543 char ** canon)
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
544 {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
545 int error;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
546 char name[256];
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
547 char * dot;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
548
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
549 CYG_REPORT_FUNCNAMETYPE( "cyg_dns_getaddrinfo", "returning %08x" );
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
550 CYG_REPORT_FUNCARG3( "hostname=%08x, addrs=%08x, num=%2d",
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
551 hostname, addrs, num );
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
552
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
553 if ( !hostname || !addrs || !num ) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
554 CYG_REPORT_RETVAL( NULL );
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
555 return -EAI_FAIL;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
556 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
557
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
558 CYG_CHECK_DATA_PTR( hostname, "hostname is not a valid pointer!" );
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
559 CYG_CHECK_DATA_PTR( addrs, "addrs is not a valid pointer!");
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
560 CYG_ASSERT( num > 0, "Invalid number of sockaddr stuctures");
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
561
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
562 if (!valid_hostname(hostname)) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
563 /* it could be a dot address */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
564 struct sockaddr_in * sa4 = (struct sockaddr_in *)&addrs[0];
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
565 memset(&addrs[0],0,sizeof(struct sockaddr));
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
566 if (inet_pton(AF_INET, hostname, (char *)&sa4->sin_addr.s_addr)) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
567 sa4->sin_family = AF_INET;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
568 sa4->sin_len = sizeof(*sa4);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
569 CYG_REPORT_RETVAL (1);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
570 return 1;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
571 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
572 #ifdef CYGPKG_NET_INET6
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
573 {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
574 /* it could be a colon address */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
575 struct sockaddr_in6 * sa6 = (struct sockaddr_in6 *)&addrs[0];
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
576 memset(&addrs[0],0,sizeof(struct sockaddr));
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
577 if (inet_pton(AF_INET6, hostname, (char *)&sa6->sin6_addr.s6_addr)) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
578 sa6->sin6_family = AF_INET6;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
579 sa6->sin6_len = sizeof(*sa6);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
580 CYG_REPORT_RETVAL (1);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
581 return 1;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
582 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
583 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
584 #endif
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
585 CYG_REPORT_RETVAL (-EAI_NONAME);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
586 return -EAI_NONAME;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
587 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
588
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
589 /* Has the socket to the DNS server been opened? */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
590 if (s < 0) {
1691
c81db0785971 * src/dns.c (cyg_dns_getaddrinfo): Typo spotted by Andy Jackson.
asl
parents: 1069
diff changeset
591 CYG_REPORT_RETVAL( -EAI_FAIL );
1005
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
592 return -EAI_FAIL;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
593 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
594
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
595 if (domainname) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
596 if ((strlen(hostname) + strlen(domainname)) > 254) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
597 cyg_drv_mutex_unlock(&dns_mutex);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
598 CYG_REPORT_RETVAL( -EAI_FAIL );
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
599 return -EAI_FAIL;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
600 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
601 strcpy(name, hostname);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
602 strcat(name, ".");
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
603 strcat(name, domainname);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
604 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
605 cyg_drv_mutex_lock(&dns_mutex);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
606
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
607 /* If the hostname ends with . it a FQDN. Don't bother adding the
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
608 domainname. If it does not contain a . , try appending with the
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
609 domainname first. If it does have a . , try without a domain name
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
610 first. */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
611
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
612 dot = rindex(hostname,'.');
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
613 if (dot) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
614 if (*(dot+1) == '\0') {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
615 /* FQDN */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
616 error = do_lookups(hostname, addrs, num, family, canon);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
617 } else {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
618 /* Dot somewhere */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
619 error = do_lookups(hostname, addrs, num, family, canon);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
620 if (domainname && (error == -EAI_NONAME)) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
621 error = do_lookups(name, addrs, num, family, canon);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
622 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
623 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
624 } else {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
625 /* No Dot. Try adding domainname first */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
626 error = -EAI_NONAME;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
627 if (domainname) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
628 error = do_lookups(name, addrs, num, family, canon);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
629 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
630 if (error == -EAI_NONAME) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
631 error = do_lookups(hostname, addrs, num, family, canon);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
632 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
633 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
634 cyg_drv_mutex_unlock(&dns_mutex);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
635 CYG_REPORT_RETVAL( error );
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
636 return error;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
637 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
638
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
639 /* This implements the interface between getnameinfo and the dns
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
640 client. */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
641 externC int
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
642 cyg_dns_getnameinfo(const struct sockaddr * sa, char * host, size_t hostlen)
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
643 {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
644 char hostname[80];
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
645 unsigned char msg[MAXDNSMSGSIZE];
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
646 struct hostent * hent;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
647 int len;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
648
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
649 CYG_REPORT_FUNCNAMETYPE( "cyg_dns_getnameinfo", "returning %08x" );
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
650 CYG_REPORT_FUNCARG3( "sa=%08x, host=%08x, hostlen=%3d",
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
651 sa, host, hostlen );
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
652
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
653 CYG_CHECK_DATA_PTR( sa, "sa is not a valid pointer");
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
654 CYG_CHECK_DATA_PTR( host, "host is not a valid data pointer");
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
655 CYG_ASSERT(hostlen >0, "Invalid host length");
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
656
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
657 /* Has the socket to the DNS server been opened? */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
658 if (s < 0) {
1692
f7cb1caf8d2a * src/dns.c (cyg_dns_getnameinfo): And another typo
asl
parents: 1691
diff changeset
659 CYG_REPORT_RETVAL( -EAI_FAIL );
1005
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
660 return -EAI_FAIL;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
661 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
662
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
663 cyg_drv_mutex_lock(&dns_mutex);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
664
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
665 switch (sa->sa_family) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
666 case AF_INET: {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
667 struct sockaddr_in * sa4 = (struct sockaddr_in *)sa;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
668 unsigned char * addr = (char *)&sa4->sin_addr.s_addr;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
669 sprintf(hostname, "%d.%d.%d.%d.IN-ADDR.ARPA.",
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
670 addr[3],addr[2],addr[1],addr[0]);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
671 break;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
672 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
673 #ifdef CYGPKG_NET_INET6
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
674 case AF_INET6: {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
675 struct sockaddr_in6 * sa6 = (struct sockaddr_in6 *)sa;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
676 int i;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
677
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
678 for (i=15; i >= 0; i--) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
679 sprintf(&hostname[(15*2*2) - (i*2*2)], "%x.%x.",
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
680 sa6->sin6_addr.s6_addr[i] & 0x0f,
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
681 (sa6->sin6_addr.s6_addr[i] & 0xf0) >> 4);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
682 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
683 sprintf(&hostname[16*2*2],"IP6.INT");
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
684 break;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
685 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
686 #endif
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
687 default:
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
688 cyg_drv_mutex_lock(&dns_mutex);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
689 CYG_REPORT_RETVAL( -EAI_FAMILY);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
690 return -EAI_FAMILY;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
691 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
692
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
693 memset(msg, 0, sizeof(msg));
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
694
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
695 /* Build a PTR type request using the hostname */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
696 len = build_query(msg, hostname, DNS_TYPE_PTR);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
697 if (len < 0) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
698 cyg_drv_mutex_unlock(&dns_mutex);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
699 CYG_REPORT_RETVAL( -EAI_FAIL );
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
700 return -EAI_FAIL;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
701 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
702
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
703 /* Send the request and wait for an answer */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
704 len = send_recv(msg, len, sizeof(msg));
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
705 if (len < 0) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
706 cyg_drv_mutex_unlock(&dns_mutex);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
707 CYG_REPORT_RETVAL( -EAI_FAIL );
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
708 return -EAI_FAIL;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
709 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
710
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
711 /* Parse the answer for the host name */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
712 hent = parse_answer(msg, DNS_TYPE_PTR);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
713
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
714 /* If no name is known return an error */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
715 if (!hent) {
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
716 cyg_drv_mutex_unlock(&dns_mutex);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
717 CYG_REPORT_RETVAL( -EAI_NONAME );
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
718 return -EAI_NONAME;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
719 }
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
720
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
721 /* Otherwise copy it into our results buffer and tidy up */
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
722 strncpy(host, hent->h_name,hostlen);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
723 free_hent(hent);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
724
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
725 cyg_drv_mutex_unlock(&dns_mutex);
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
726 CYG_REPORT_RETVAL( -EAI_NONE );
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
727 return -EAI_NONE;
1f968b35cd30 * doc/dns.sgml: Updated to reflect changes for IPv6.
asl
parents: 212
diff changeset
728 }