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annotate packages/net/ns/dns/current/src/dns.c @ 210:d2c90368aeef

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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children 6eb55882e01c
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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/
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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 }
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119
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120 /* Allocate hent structure with room for one in_addr. Returns NULL on
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121 failure. */
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122 static struct hostent*
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123 alloc_hent(void)
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124 {
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125 struct hostent *hent;
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126
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127 hent = malloc(sizeof(struct hostent));
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128 if (hent) {
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129 memset(hent, 0, sizeof(struct hostent));
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130 hent->h_addr_list = malloc(sizeof(char *)*2);
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131 if (!hent->h_addr_list) {
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132 free_hent(hent);
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133 return NULL;
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134 }
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135 hent->h_addr_list[0] = malloc(sizeof(struct in_addr));
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136 if (!hent->h_addr_list[0]) {
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137 free_hent(hent);
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138 return NULL;
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139 }
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140 hent->h_addr_list[1] = NULL;
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141 }
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142
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143 return hent;
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144 }
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145
210
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146 /* Thread destructor used to free stuff stored in per-thread data slot. */
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147 static void
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148 thread_destructor(CYG_ADDRWORD data)
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149 {
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150 struct hostent *hent;
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151 hent = (struct hostent *)cyg_thread_get_data(index);
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152 if (hent)
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153 free_hent(hent);
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154 return;
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155 data=data;
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156 }
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157
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158 /* Store the hent away in the per-thread data. */
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159 static void
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160 store_hent(struct hostent *hent)
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161 {
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162 // Prevent memory leaks by setting a destructor to be
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163 // called on thread exit to free per-thread data.
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164 cyg_thread_add_destructor( &thread_destructor, 0 );
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165 cyg_thread_set_data(index, (CYG_ADDRWORD)hent);
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166 }
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167
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168 /* If there is an answer to an old query, free the memory it uses. */
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169 static void
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170 free_stored_hent(void)
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171 {
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172 struct hostent *hent;
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173 hent = (struct hostent *)cyg_thread_get_data(index);
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174 if (hent) {
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175 free_hent(hent);
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176 cyg_thread_set_data(index, (CYG_ADDRWORD)NULL);
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177 cyg_thread_rem_destructor( &thread_destructor, 0 );
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178 }
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179 }
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180
208
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181 /* Send the query to the server and read the response back. Return -1
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182 if it fails, otherwise put the response back in msg and return the
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183 length of the response. */
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184 static int
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185 send_recv(char * msg, int len, int msglen)
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186 {
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187 struct dns_header *dns_hdr;
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188 struct timeval timeout;
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189 int finished = false;
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190 int backoff = 1;
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191 fd_set readfds;
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192 int written;
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193 int ret;
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194
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195 CYG_REPORT_FUNCNAMETYPE( "send_recv", "returning %d" );
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196 CYG_REPORT_FUNCARG3( "msg=%08x, len=%d, msglen", msg, len, msglen );
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197
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198 CYG_CHECK_DATA_PTR( msg, "msg is not a valid pointer!" );
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199
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200 dns_hdr = (struct dns_header *) msg;
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201
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202 do {
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203 written = write(s, msg, len);
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204 if (written < 0) {
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205 ret = -1;
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206 break;
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207 }
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208
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209 FD_ZERO(&readfds);
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210 FD_SET(s, &readfds);
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211
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212 timeout.tv_sec = backoff;
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213 timeout.tv_usec = 0;
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214 backoff = backoff << 1;
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215
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216 ret = select(s+1, &readfds, NULL, NULL, &timeout);
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217 if (ret < 0) {
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218 ret = -1;
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219 break;
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220 }
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221 /* Timeout */
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222 if (ret == 0) {
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223 if (backoff > 16) {
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224 h_errno = TRY_AGAIN;
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225 ret = -1;
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226 break;
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227 }
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228 }
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229 if (ret == 1) {
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230 ret = read(s, msg, msglen);
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231 if (ret < 0) {
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232 ret = -1;
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233 break;
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234 }
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235
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236 /* Reply to an old query. Ignore it */
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237 if (ntohs(dns_hdr->id) != (id-1)) {
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238 continue;
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239 }
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240 finished = true;
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241 }
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242 } while (!finished);
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243
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244 CYG_REPORT_RETVAL( ret );
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245
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246 return ret;
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247 }
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248
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249 /* Include the DNS client implementation code */
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250 #include <cyg/ns/dns/dns_impl.inl>
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251
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252 /* Initialise the resolver. Open a socket and bind it to the address
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253 of the server. return -1 if something goes wrong, otherwise 0. If
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254 we are being called a second time we have to be careful to allow
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255 any ongoing lookups to finish before we close the socket and
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256 connect to a different DNS server. The danger here is that we may
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257 have to wait for upto 32 seconds if the DNS server is down.
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258 */
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259 int
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260 cyg_dns_res_init(struct in_addr *dns_server)
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261 {
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262 struct sockaddr_in server;
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263 struct servent *sent;
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264 static int init =0;
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265
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266 CYG_REPORT_FUNCNAMETYPE( "cyg_dns_res_init", "returning %d" );
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267 CYG_REPORT_FUNCARG1( "dns_server=%08x", dns_server );
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268
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269 CYG_CHECK_DATA_PTR( dns_server, "dns_server is not a valid pointer!" );
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270
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271 if (init) {
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272 cyg_drv_mutex_lock(&dns_mutex);
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273 cyg_thread_free_data_index(ptdindex);
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274 if (s >= 0) {
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275 close(s);
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276 }
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277 } else {
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278 init = 1;
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279 cyg_drv_mutex_init(&dns_mutex);
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280 cyg_drv_mutex_lock(&dns_mutex);
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281 }
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282
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283
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284 s = socket(PF_INET, SOCK_DGRAM, 0);
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285 if (s < 0) {
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286 cyg_drv_mutex_unlock(&dns_mutex);
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287 CYG_REPORT_RETVAL( -1 );
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288 return -1;
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289 }
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290
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291 sent = getservbyname("domain", "udp");
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292 if (sent == (struct servent *)0) {
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293 s = -1;
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294 cyg_drv_mutex_unlock(&dns_mutex);
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295 CYG_REPORT_RETVAL( -1 );
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296 return -1;
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297 }
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298
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299 memcpy((char *)&server.sin_addr, dns_server, sizeof(server.sin_addr));
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300 server.sin_port = sent->s_port;
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301 server.sin_family = AF_INET;
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302 server.sin_len = sizeof(server);
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303
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304 if (connect(s, (struct sockaddr *)&server, sizeof(server)) < 0) {
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305 s = -1;
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306 cyg_drv_mutex_unlock(&dns_mutex);
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307 CYG_REPORT_RETVAL( -1 );
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308 return -1;
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309 }
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310 ptdindex = cyg_thread_new_data_index();
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311
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312 cyg_drv_mutex_unlock(&dns_mutex);
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313
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314 CYG_REPORT_RETVAL( 0 );
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315 return 0;
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316 }