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annotate packages/redboot/current/src/net/dns.c @ 1357:7b0dae4bd7a9

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Use DNS server from DHCP info if present
author gthomas
date Fri, 07 Nov 2003 18:14:10 +0000
parents d2c90368aeef
children
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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 // Copyright (C) 2003 Gary Thomas
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13 //
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14 // eCos is free software; you can redistribute it and/or modify it under
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15 // the terms of the GNU General Public License as published by the Free
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16 // Software Foundation; either version 2 or (at your option) any later version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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19 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License along
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24 // with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use macros
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28 // or inline functions from this file, or you compile this file and link it
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29 // with other works to produce a work based on this file, this file does not
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30 // by itself cause the resulting work to be covered by the GNU General Public
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31 // License. However the source code for this file must still be made available
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32 // in accordance with section (3) of the GNU General Public License.
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33 //
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34 // This exception does not invalidate any other reasons why a work based on
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35 // this file might be covered by the GNU General Public License.
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36 //
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37 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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38 // at http://sources.redhat.com/ecos/ecos-license/
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39 // -------------------------------------------
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40 //####ECOSGPLCOPYRIGHTEND####
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41 //=============================================================================
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42 //#####DESCRIPTIONBEGIN####
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43 //
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44 // Author(s): jskov
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45 // Contributors:jskov
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46 // Date: 2001-09-26
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47 // Description: Provides DNS lookup as per RFC 1034/1035.
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48 //
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49 // Note: This is a stripped down clone of dns.c from the CYGPKG_NS_DNS
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50 // package which does not use malloc/free and has been tweaked to
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51 // use UDP via RedBoot's network stack. Also adds commands
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52 // to set the DNS server IP at runtime.
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53 //
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54 //####DESCRIPTIONEND####
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55 //
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56 //=============================================================================
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57
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58 #include <cyg/hal/drv_api.h>
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59 #include <cyg/infra/cyg_type.h>
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60 #include <cyg/infra/cyg_trac.h> /* Tracing support */
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61
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62 #include <net/net.h>
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63 #include <redboot.h>
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64 /* #include <cyg/ns/dns/dns.h> - it's been moved to redboot.h */
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65 #include <cyg/ns/dns/dns_priv.h>
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66
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67 #ifdef CYGSEM_REDBOOT_FLASH_CONFIG
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68 #include <flash_config.h>
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69
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70 RedBoot_config_option("DNS server IP address",
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71 dns_ip,
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72 ALWAYS_ENABLED, true,
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73 CONFIG_IP,
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74 0
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75 );
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76 #endif
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77
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78 /* So we remember which ports have been used */
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79 static int get_port = 7700;
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80
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81 #define DOMAIN_PORT 53
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82
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83 /* Some magic to make dns_impl.inl compile under RedBoot */
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84 #define sprintf diag_sprintf
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85
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86 /* DNS server address possibly returned from bootp */
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87 struct in_addr __bootp_dns_addr;
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88 cyg_bool __bootp_dns_set = false;
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89
208
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90 struct sockaddr_in server;
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91
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92 /* static buffers so we can make do without malloc */
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93 static struct hostent _hent;
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94 static char* _h_addr_list[2];
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95 static struct in_addr _h_addr_list0;
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96 static int _hent_alloc = 0;
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97
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98 #define _STRING_COUNT 2
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99 #define _STRING_LENGTH 64
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100 static char _strings[_STRING_COUNT][_STRING_LENGTH];
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101 static int _strings_alloc = 0;
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102
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103 /* as in dns.c proper */
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104 static short id = 0; /* ID of the last query */
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105 static int s = -1; /* Socket to the DNS server */
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106 static cyg_drv_mutex_t dns_mutex; /* Mutex to stop multiple queries as once */
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107 static char * domainname=NULL; /* Domain name used for queries */
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108
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109
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110 /* Allocate space for string of length (len). Return NULL on
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111 failure. */
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112 static char*
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113 alloc_string(int len)
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114 {
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115 int i;
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116
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117 if (len > _STRING_LENGTH)
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118 return NULL;
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119
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120 for (i = 0; i < _STRING_COUNT; i++) {
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121 if (_strings_alloc & (1 << i)) continue;
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122 _strings_alloc |= (1<<i);
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123 return _strings[i];
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124 }
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125 return NULL;
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126 }
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127
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128 static void
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129 free_string(char* s)
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130 {
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131 int i;
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132 for (i = 0; i < _STRING_COUNT; i++) {
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133 if (_strings[i] == s) {
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134 _strings_alloc &= ~(1<<i);
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135 break;
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136 }
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137 }
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138 }
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139
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140 /* Deallocate the memory taken to hold a hent structure */
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141 static void
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142 free_hent(struct hostent * hent)
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143 {
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144 if (hent->h_name) {
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145 free_string(hent->h_name);
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146 }
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147 _hent_alloc = 0;
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148 }
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149
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150 /* Allocate hent structure with room for one in_addr. Returns NULL on
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151 failure. */
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152 static struct hostent*
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153 alloc_hent(void)
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154 {
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155 struct hostent *hent;
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156
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157 if (_hent_alloc) return NULL;
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158
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159 hent = &_hent;
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160 memset(hent, 0, sizeof(struct hostent));
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161 hent->h_addr_list = _h_addr_list;
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162 hent->h_addr_list[0] = (char*)&_h_addr_list0;
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163 hent->h_addr_list[1] = NULL;
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164 _hent_alloc = 1;
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165
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166 return hent;
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167 }
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168
210
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169 static __inline__ void
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170 free_stored_hent(void)
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171 {
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172 free_hent( &_hent );
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173 }
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174
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175 static __inline__ void
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176 store_hent(struct hostent *hent)
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177 {
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178 hent=hent; // avoid warning
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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 int finished = false;
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189 int read = 0;
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190
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191 dns_hdr = (struct dns_header *) msg;
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192
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193 do {
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194 int len_togo = len;
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195 struct timeval timeout;
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196 struct sockaddr_in local_addr, from_addr;
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197
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198 memset((char *)&local_addr, 0, sizeof(local_addr));
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199 local_addr.sin_family = AF_INET;
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200 local_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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201 local_addr.sin_port = htons(get_port++);
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202
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203 if (__udp_sendto(msg, len_togo, &server, &local_addr) < 0)
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204 return -1;
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205
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206 memset((char *)&from_addr, 0, sizeof(from_addr));
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207
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208 timeout.tv_sec = CYGNUM_REDBOOT_NETWORKING_DNS_TIMEOUT;
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209 timeout.tv_usec = 0;
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210
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211 read = __udp_recvfrom(msg, len, &from_addr, &local_addr, &timeout);
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212 if (read < 0)
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213 return -1;
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214
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215 /* Reply to an old query. Ignore it */
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216 if (ntohs(dns_hdr->id) != (id-1)) {
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217 continue;
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218 }
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219 finished = true;
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220 } while (!finished);
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221
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222 return read;
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223 }
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224
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225 void
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226 set_dns(char* new_ip)
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227 {
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228 in_addr_t dns_ip;
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229
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230 memset(&server.sin_addr, 0, sizeof(server.sin_addr));
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231 if (!inet_aton(new_ip, &dns_ip)) {
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232 diag_printf("Bad DNS server address: %s\n", new_ip);
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233 } else {
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234 memcpy(&server.sin_addr, &dns_ip, sizeof(dns_ip));
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235 /* server config is valid */
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236 s = 0;
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237 }
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238 }
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239
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240 void
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241 show_dns(void)
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242 {
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243 diag_printf(", DNS server IP: %s", inet_ntoa((in_addr_t *)&server.sin_addr));
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244 if (0 == server.sin_addr.s_addr) {
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245 s = -1;
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246 }
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247 }
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248
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249 /* Initialise the resolver. Open a socket and bind it to the address
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250 of the server. return -1 if something goes wrong, otherwise 0 */
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251 int
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252 redboot_dns_res_init(void)
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253 {
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254 memset((char *)&server, 0, sizeof(server));
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255 server.sin_len = sizeof(server);
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256 server.sin_family = AF_INET;
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257 server.sin_port = htons(DOMAIN_PORT);
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258 cyg_drv_mutex_init(&dns_mutex);
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259
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260 /* If we got a DNS server address from the DHCP/BOOTP, then use that address */
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261 if ( __bootp_dns_set ) {
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262 memcpy(&server.sin_addr, &__bootp_dns_addr, sizeof(__bootp_dns_addr) );
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263 s = 0;
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264 }
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265 else {
208
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266 #ifdef CYGSEM_REDBOOT_FLASH_CONFIG
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267 {
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268 ip_addr_t dns_ip;
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269
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270 flash_get_config("dns_ip", &dns_ip, CONFIG_IP);
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271 if (dns_ip[0] == 0 && dns_ip[1] == 0 && dns_ip[2] == 0 && dns_ip[3] == 0)
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272 return -1;
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273 memcpy(&server.sin_addr, &dns_ip, sizeof(dns_ip));
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274 /* server config is valid */
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275 s = 0;
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276 }
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277 #else
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278 // Use static configuration
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279 set_dns(__Xstr(CYGPKG_REDBOOT_NETWORKING_DNS_IP));
208
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280 #endif
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281 }
208
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282
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283 return 0;
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284 }
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285
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286 /* Include the DNS client implementation code */
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287 #include <cyg/ns/dns/dns_impl.inl>