Mercurial > ecos
annotate packages/net/ns/dns/current/src/dns.c @ 1005:1f968b35cd30
* doc/dns.sgml: Updated to reflect changes for IPv6.
* include/dns_impl.inl (setdomainname): Append a . to the end of
the domainname if it does not have one.
* cdl/dns.cdl: CYGOPT_NS_DNS_FIRST_FAMILTY to control order of
results.
* src/dns.c: Order the results from cyg_dns_getaddrinfo.
* test/dns1.c: Re-written to perform better testing and for
getaddrinfo and getnameinfo.
* test/dns2.c: Removed. It does not add anything useful.
* src/dns.c (cyg_dns_getnameinfo): New. Interface between
getnameinfo and the DNS client.
* src/dns.c (cyg_dns_getaddrinfo): New. Interface between
getaddrinfo and the DNS client. This supports both IPv4 and IPv6
* test/dns1.c: Added tests for getnameinfo using both IPv4 and
IPv6 addresses.
| author | asl |
|---|---|
| date | Mon, 12 May 2003 10:06:05 +0000 |
| parents | 94b558c9fb67 |
| children | 1aaed612fe59 |
| rev | line source |
|---|---|
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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 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 |
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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; |
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152 hent = (struct hostent *)cyg_thread_get_data(ptdindex); |
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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 ); |
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166 cyg_thread_set_data(ptdindex, (CYG_ADDRWORD)hent); |
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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; |
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174 hent = (struct hostent *)cyg_thread_get_data(ptdindex); |
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175 if (hent) { |
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176 free_hent(hent); |
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177 cyg_thread_set_data(ptdindex, (CYG_ADDRWORD)NULL); |
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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 |
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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 /* Initialise the resolver. Open a socket and bind it to the address |
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254 of the server. return -1 if something goes wrong, otherwise 0. If |
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255 we are being called a second time we have to be careful to allow |
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256 any ongoing lookups to finish before we close the socket and |
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257 connect to a different DNS server. The danger here is that we may |
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258 have to wait for upto 32 seconds if the DNS server is down. |
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259 */ |
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260 int |
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261 cyg_dns_res_init(struct in_addr *dns_server) |
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262 { |
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263 struct sockaddr_in server; |
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264 struct servent *sent; |
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265 static int init =0; |
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266 |
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267 CYG_REPORT_FUNCNAMETYPE( "cyg_dns_res_init", "returning %d" ); |
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268 CYG_REPORT_FUNCARG1( "dns_server=%08x", dns_server ); |
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269 |
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270 CYG_CHECK_DATA_PTR( dns_server, "dns_server is not a valid pointer!" ); |
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271 |
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272 if (init) { |
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273 cyg_drv_mutex_lock(&dns_mutex); |
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274 cyg_thread_free_data_index(ptdindex); |
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275 if (s >= 0) { |
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276 close(s); |
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277 } |
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278 } else { |
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279 init = 1; |
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280 cyg_drv_mutex_init(&dns_mutex); |
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281 cyg_drv_mutex_lock(&dns_mutex); |
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282 } |
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283 |
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284 |
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285 s = socket(PF_INET, SOCK_DGRAM, 0); |
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286 if (s < 0) { |
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287 cyg_drv_mutex_unlock(&dns_mutex); |
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288 CYG_REPORT_RETVAL( -1 ); |
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289 return -1; |
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290 } |
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291 |
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292 sent = getservbyname("domain", "udp"); |
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293 if (sent == (struct servent *)0) { |
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294 s = -1; |
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295 cyg_drv_mutex_unlock(&dns_mutex); |
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296 CYG_REPORT_RETVAL( -1 ); |
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297 return -1; |
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298 } |
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299 |
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300 memcpy((char *)&server.sin_addr, dns_server, sizeof(server.sin_addr)); |
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301 server.sin_port = sent->s_port; |
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302 server.sin_family = AF_INET; |
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303 server.sin_len = sizeof(server); |
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304 |
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305 if (connect(s, (struct sockaddr *)&server, sizeof(server)) < 0) { |
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306 s = -1; |
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307 cyg_drv_mutex_unlock(&dns_mutex); |
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308 CYG_REPORT_RETVAL( -1 ); |
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309 return -1; |
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310 } |
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311 ptdindex = cyg_thread_new_data_index(); |
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312 |
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313 cyg_drv_mutex_unlock(&dns_mutex); |
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314 |
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315 CYG_REPORT_RETVAL( 0 ); |
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316 return 0; |
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317 } |
| 1005 | 318 |
| 319 /* add_answer checks to see if we already have this answer and if not, | |
| 320 adds it to the answers. */ | |
| 321 static int | |
| 322 add_answer(char *rdata, short rr_type, int family, | |
| 323 struct sockaddr addrs[], int num, int used) { | |
| 324 int i; | |
| 325 int found = 0; | |
| 326 | |
| 327 for (i = 0; i < used ; i++) { | |
| 328 if ((addrs[i].sa_family == family) && | |
| 329 !memcmp(addrs[i].sa_data, rdata, addrs[i].sa_len)) { | |
| 330 found = 1; | |
| 331 break; | |
| 332 } | |
| 333 } | |
| 334 if (!found) { | |
| 335 memset(&addrs[used],0,sizeof(addrs[used])); | |
| 336 addrs[used].sa_family = family; | |
| 337 | |
| 338 switch(family) { | |
| 339 case AF_INET: { | |
| 340 struct sockaddr_in * addr = (struct sockaddr_in *) &addrs[used]; | |
| 341 addr->sin_len = sizeof(*addr); | |
| 342 memcpy(&addr->sin_addr, rdata, sizeof(struct in_addr)); | |
| 343 used++; | |
| 344 break; | |
| 345 } | |
| 346 #ifdef CYGPKG_NET_INET6 | |
| 347 case AF_INET6: { | |
| 348 struct sockaddr_in6 * addr = (struct sockaddr_in6 *) &addrs[used]; | |
| 349 addr->sin6_len = sizeof(*addr); | |
| 350 memcpy(&addr->sin6_addr, rdata, sizeof(struct in6_addr)); | |
| 351 used++; | |
| 352 break; | |
| 353 } | |
| 354 #endif | |
| 355 default: | |
| 356 used = -EAI_FAMILY; | |
| 357 } | |
| 358 } | |
| 359 return used; | |
| 360 } | |
| 361 | |
| 362 /* This decodes the answer and puts the results into the addrs | |
| 363 array. This function can deal with IPv6 AAAA records as well as A | |
| 364 records. Thus its more complex than the parse_answer function in | |
| 365 the inline code. This complexity is only needed by getaddrinfo, so | |
| 366 i decided to leave parse_anser alone. */ | |
| 367 | |
| 368 static int | |
| 369 decode(char *msg, short rr_type, int family, | |
| 370 struct sockaddr addrs[], int num, int used, char **canon) { | |
| 371 | |
| 372 struct dns_header *dns_hdr; | |
| 373 struct resource_record rr, *rr_p = NULL; | |
| 374 char *qname = NULL; | |
| 375 char *ptr; | |
| 376 | |
| 377 dns_hdr = (struct dns_header *)msg; | |
| 378 | |
| 379 if (DNS_REPLY_NAME_ERROR == dns_hdr->rcode) { | |
| 380 h_errno = HOST_NOT_FOUND; | |
| 381 return -EAI_NONAME; | |
| 382 } | |
| 383 | |
| 384 if ((dns_hdr->qr != 1) || | |
| 385 (dns_hdr->opcode != DNS_QUERY)) { | |
| 386 return -EAI_FAIL; | |
| 387 } | |
| 388 | |
| 389 if (dns_hdr->rcode != DNS_REPLY_NOERR) { | |
| 390 return -EAI_NONAME; | |
| 391 } | |
| 392 | |
| 393 dns_hdr->ancount = ntohs(dns_hdr->ancount); | |
| 394 dns_hdr->qdcount = ntohs(dns_hdr->qdcount); | |
| 395 ptr = (char *)&dns_hdr[1]; | |
| 396 | |
| 397 /* Skip over the query section */ | |
| 398 if (dns_hdr->qdcount > 0) { | |
| 399 while (dns_hdr->qdcount) { | |
| 400 ptr += qname_len(ptr); | |
| 401 ptr += 4; /* skip type & class */ | |
| 402 dns_hdr->qdcount--; | |
| 403 } | |
| 404 } | |
| 405 | |
| 406 /* Read the answers resource records to find an answer of the | |
| 407 correct type. */ | |
| 408 while (dns_hdr->ancount && (used >= 0) && (used < num)) { | |
| 409 qname = ptr; | |
| 410 ptr += qname_len(ptr); | |
| 411 rr_p = (struct resource_record *)ptr; | |
| 412 memcpy(&rr, ptr, sizeof(rr)); | |
| 413 if ((rr.rr_type == htons(rr_type)) && | |
| 414 (rr.class == htons(DNS_CLASS_IN))) { | |
| 415 used = add_answer(rr_p->rdata, rr_type, family, addrs, num, used); | |
| 416 if (canon && !*canon) { | |
| 417 *canon = real_name(msg,qname); | |
| 418 } | |
| 419 } | |
| 420 ptr += sizeof(struct resource_record) - | |
| 421 sizeof(rr.rdata) + ntohs(rr.rdlength); | |
| 422 dns_hdr->ancount--; | |
| 423 } | |
| 424 if (used == 0) { | |
| 425 return -EAI_NONAME; | |
| 426 } | |
| 427 return used; | |
| 428 } | |
| 429 | |
| 430 /* Do a lookup for a particular type of resource record. */ | |
| 431 static int | |
| 432 do_lookup (const char * hostname, | |
| 433 struct sockaddr addrs[], int num, int used, | |
| 434 short rr_type, int family, char **canon) { | |
| 435 | |
| 436 unsigned char msg[MAXDNSMSGSIZE]; | |
| 437 int error; | |
| 438 int len; | |
| 439 | |
| 440 /* First try the name as passed in */ | |
| 441 memset(msg, 0, sizeof(msg)); | |
| 442 len = build_query(msg, hostname, rr_type); | |
| 443 if (len < 0) { | |
| 444 return -EAI_FAIL; | |
| 445 } | |
| 446 | |
| 447 /* Send the query and wait for an answer */ | |
| 448 len = send_recv(msg, len, sizeof(msg)); | |
| 449 if (len < 0) { | |
| 450 return -EAI_FAIL; | |
| 451 } | |
| 452 | |
| 453 /* Decode the answer */ | |
| 454 error = decode(msg, rr_type, family, addrs, num, used, canon); | |
| 455 return error; | |
| 456 } | |
| 457 | |
| 458 static int do_lookups(const char * hostname, | |
| 459 struct sockaddr addrs[], int num, | |
| 460 int family, char ** canon) { | |
| 461 int error; | |
| 462 #ifdef CYGPKG_NET_INET6 | |
| 463 int error6; | |
| 464 #endif | |
| 465 | |
| 466 switch (family) { | |
| 467 case AF_INET: | |
| 468 error = do_lookup(hostname, addrs, num, 0, DNS_TYPE_A, AF_INET, canon); | |
| 469 break; | |
| 470 #ifdef CYGPKG_NET_INET6 | |
| 471 case AF_INET6: | |
| 472 error = do_lookup(hostname, addrs, num, 0, DNS_TYPE_AAAA, AF_INET6, canon); | |
| 473 break; | |
| 474 #endif | |
| 475 case PF_UNSPEC: | |
| 476 #ifndef CYGPKG_NET_INET6 | |
| 477 error = do_lookup(hostname, addrs, num, 0, DNS_TYPE_A, AF_INET, canon); | |
| 478 #else | |
| 479 #ifdef CYGOPT_NS_DNS_FIRST_FAMILTY_AF_INET | |
| 480 error = do_lookup(hostname, addrs, num, 0, DNS_TYPE_A, AF_INET, canon); | |
| 481 if (error > 0 ) { | |
| 482 error6 = do_lookup(hostname, addrs, num, error, DNS_TYPE_AAAA, | |
| 483 AF_INET6, canon); | |
| 484 } else { | |
| 485 error6 = do_lookup(hostname, addrs, num, 0, DNS_TYPE_AAAA, | |
| 486 AF_INET6, canon); | |
| 487 } | |
| 488 if (error6 > 0) { | |
| 489 error = error6; | |
| 490 } | |
| 491 #else // CYGOPT_NS_DNS_FIRST_FAMILY_AF_INET | |
| 492 error6 = do_lookup(hostname, addrs, num, 0, DNS_TYPE_AAAA, | |
| 493 AF_INET6, canon); | |
| 494 if (error6> 0 ) { | |
| 495 error = do_lookup(hostname, addrs, num, error6, DNS_TYPE_A, | |
| 496 AF_INET, canon); | |
| 497 } else { | |
| 498 error = do_lookup(hostname, addrs, num, 0, DNS_TYPE_A, | |
| 499 AF_INET, canon); | |
| 500 } | |
| 501 #endif // CYGOPT_NS_DNS_FIRST_FAMILY_AF_INET | |
| 502 #endif // CYGPKG_NET_INET6 | |
| 503 break; | |
| 504 default: | |
| 505 error = -EAI_FAMILY; | |
| 506 } | |
| 507 return error; | |
| 508 } | |
| 509 | |
| 510 /* This implements the interface between getaddrinfo and the dns | |
| 511 client. hostent is not used here since that only works with IPv4 | |
| 512 addresses, where as this function needs to be protocol | |
| 513 independent. */ | |
| 514 int | |
| 515 cyg_dns_getaddrinfo(const char * hostname, | |
| 516 struct sockaddr addrs[], int num, | |
| 517 int family, | |
| 518 char ** canon) | |
| 519 { | |
| 520 int error; | |
| 521 char name[256]; | |
| 522 char * dot; | |
| 523 | |
| 524 CYG_REPORT_FUNCNAMETYPE( "cyg_dns_getaddrinfo", "returning %08x" ); | |
| 525 CYG_REPORT_FUNCARG3( "hostname=%08x, addrs=%08x, num=%2d", | |
| 526 hostname, addrs, num ); | |
| 527 | |
| 528 if ( !hostname || !addrs || !num ) { | |
| 529 CYG_REPORT_RETVAL( NULL ); | |
| 530 return -EAI_FAIL; | |
| 531 } | |
| 532 | |
| 533 CYG_CHECK_DATA_PTR( hostname, "hostname is not a valid pointer!" ); | |
| 534 CYG_CHECK_DATA_PTR( addrs, "addrs is not a valid pointer!"); | |
| 535 CYG_ASSERT( num > 0, "Invalid number of sockaddr stuctures"); | |
| 536 | |
| 537 if (!valid_hostname(hostname)) { | |
| 538 /* it could be a dot address */ | |
| 539 struct sockaddr_in * sa4 = (struct sockaddr_in *)&addrs[0]; | |
| 540 memset(&addrs[0],0,sizeof(struct sockaddr)); | |
| 541 if (inet_pton(AF_INET, hostname, (char *)&sa4->sin_addr.s_addr)) { | |
| 542 sa4->sin_family = AF_INET; | |
| 543 sa4->sin_len = sizeof(*sa4); | |
| 544 CYG_REPORT_RETVAL (1); | |
| 545 return 1; | |
| 546 } | |
| 547 #ifdef CYGPKG_NET_INET6 | |
| 548 { | |
| 549 /* it could be a colon address */ | |
| 550 struct sockaddr_in6 * sa6 = (struct sockaddr_in6 *)&addrs[0]; | |
| 551 memset(&addrs[0],0,sizeof(struct sockaddr)); | |
| 552 if (inet_pton(AF_INET6, hostname, (char *)&sa6->sin6_addr.s6_addr)) { | |
| 553 sa6->sin6_family = AF_INET6; | |
| 554 sa6->sin6_len = sizeof(*sa6); | |
| 555 CYG_REPORT_RETVAL (1); | |
| 556 return 1; | |
| 557 } | |
| 558 } | |
| 559 #endif | |
| 560 CYG_REPORT_RETVAL (-EAI_NONAME); | |
| 561 return -EAI_NONAME; | |
| 562 } | |
| 563 | |
| 564 /* Has the socket to the DNS server been opened? */ | |
| 565 if (s < 0) { | |
| 566 CYG_REPORT_RETVAL( -EIA_FAIL ); | |
| 567 return -EAI_FAIL; | |
| 568 } | |
| 569 | |
| 570 if (domainname) { | |
| 571 if ((strlen(hostname) + strlen(domainname)) > 254) { | |
| 572 cyg_drv_mutex_unlock(&dns_mutex); | |
| 573 CYG_REPORT_RETVAL( -EAI_FAIL ); | |
| 574 return -EAI_FAIL; | |
| 575 } | |
| 576 strcpy(name, hostname); | |
| 577 strcat(name, "."); | |
| 578 strcat(name, domainname); | |
| 579 } | |
| 580 cyg_drv_mutex_lock(&dns_mutex); | |
| 581 | |
| 582 /* If the hostname ends with . it a FQDN. Don't bother adding the | |
| 583 domainname. If it does not contain a . , try appending with the | |
| 584 domainname first. If it does have a . , try without a domain name | |
| 585 first. */ | |
| 586 | |
| 587 dot = rindex(hostname,'.'); | |
| 588 if (dot) { | |
| 589 if (*(dot+1) == '\0') { | |
| 590 /* FQDN */ | |
| 591 error = do_lookups(hostname, addrs, num, family, canon); | |
| 592 } else { | |
| 593 /* Dot somewhere */ | |
| 594 error = do_lookups(hostname, addrs, num, family, canon); | |
| 595 if (domainname && (error == -EAI_NONAME)) { | |
| 596 error = do_lookups(name, addrs, num, family, canon); | |
| 597 } | |
| 598 } | |
| 599 } else { | |
| 600 /* No Dot. Try adding domainname first */ | |
| 601 error = -EAI_NONAME; | |
| 602 if (domainname) { | |
| 603 error = do_lookups(name, addrs, num, family, canon); | |
| 604 } | |
| 605 if (error == -EAI_NONAME) { | |
| 606 error = do_lookups(hostname, addrs, num, family, canon); | |
| 607 } | |
| 608 } | |
| 609 cyg_drv_mutex_unlock(&dns_mutex); | |
| 610 CYG_REPORT_RETVAL( error ); | |
| 611 return error; | |
| 612 } | |
| 613 | |
| 614 /* This implements the interface between getnameinfo and the dns | |
| 615 client. */ | |
| 616 externC int | |
| 617 cyg_dns_getnameinfo(const struct sockaddr * sa, char * host, size_t hostlen) | |
| 618 { | |
| 619 char hostname[80]; | |
| 620 unsigned char msg[MAXDNSMSGSIZE]; | |
| 621 struct hostent * hent; | |
| 622 int len; | |
| 623 | |
| 624 CYG_REPORT_FUNCNAMETYPE( "cyg_dns_getnameinfo", "returning %08x" ); | |
| 625 CYG_REPORT_FUNCARG3( "sa=%08x, host=%08x, hostlen=%3d", | |
| 626 sa, host, hostlen ); | |
| 627 | |
| 628 CYG_CHECK_DATA_PTR( sa, "sa is not a valid pointer"); | |
| 629 CYG_CHECK_DATA_PTR( host, "host is not a valid data pointer"); | |
| 630 CYG_ASSERT(hostlen >0, "Invalid host length"); | |
| 631 | |
| 632 /* Has the socket to the DNS server been opened? */ | |
| 633 if (s < 0) { | |
| 634 CYG_REPORT_RETVAL( -EIA_FAIL ); | |
| 635 return -EAI_FAIL; | |
| 636 } | |
| 637 | |
| 638 cyg_drv_mutex_lock(&dns_mutex); | |
| 639 | |
| 640 switch (sa->sa_family) { | |
| 641 case AF_INET: { | |
| 642 struct sockaddr_in * sa4 = (struct sockaddr_in *)sa; | |
| 643 unsigned char * addr = (char *)&sa4->sin_addr.s_addr; | |
| 644 sprintf(hostname, "%d.%d.%d.%d.IN-ADDR.ARPA.", | |
| 645 addr[3],addr[2],addr[1],addr[0]); | |
| 646 break; | |
| 647 } | |
| 648 #ifdef CYGPKG_NET_INET6 | |
| 649 case AF_INET6: { | |
| 650 struct sockaddr_in6 * sa6 = (struct sockaddr_in6 *)sa; | |
| 651 int i; | |
| 652 | |
| 653 for (i=15; i >= 0; i--) { | |
| 654 sprintf(&hostname[(15*2*2) - (i*2*2)], "%x.%x.", | |
| 655 sa6->sin6_addr.s6_addr[i] & 0x0f, | |
| 656 (sa6->sin6_addr.s6_addr[i] & 0xf0) >> 4); | |
| 657 } | |
| 658 sprintf(&hostname[16*2*2],"IP6.INT"); | |
| 659 break; | |
| 660 } | |
| 661 #endif | |
| 662 default: | |
| 663 cyg_drv_mutex_lock(&dns_mutex); | |
| 664 CYG_REPORT_RETVAL( -EAI_FAMILY); | |
| 665 return -EAI_FAMILY; | |
| 666 } | |
| 667 | |
| 668 memset(msg, 0, sizeof(msg)); | |
| 669 | |
| 670 /* Build a PTR type request using the hostname */ | |
| 671 len = build_query(msg, hostname, DNS_TYPE_PTR); | |
| 672 if (len < 0) { | |
| 673 cyg_drv_mutex_unlock(&dns_mutex); | |
| 674 CYG_REPORT_RETVAL( -EAI_FAIL ); | |
| 675 return -EAI_FAIL; | |
| 676 } | |
| 677 | |
| 678 /* Send the request and wait for an answer */ | |
| 679 len = send_recv(msg, len, sizeof(msg)); | |
| 680 if (len < 0) { | |
| 681 cyg_drv_mutex_unlock(&dns_mutex); | |
| 682 CYG_REPORT_RETVAL( -EAI_FAIL ); | |
| 683 return -EAI_FAIL; | |
| 684 } | |
| 685 | |
| 686 /* Parse the answer for the host name */ | |
| 687 hent = parse_answer(msg, DNS_TYPE_PTR); | |
| 688 | |
| 689 /* If no name is known return an error */ | |
| 690 if (!hent) { | |
| 691 cyg_drv_mutex_unlock(&dns_mutex); | |
| 692 CYG_REPORT_RETVAL( -EAI_NONAME ); | |
| 693 return -EAI_NONAME; | |
| 694 } | |
| 695 | |
| 696 /* Otherwise copy it into our results buffer and tidy up */ | |
| 697 strncpy(host, hent->h_name,hostlen); | |
| 698 free_hent(hent); | |
| 699 | |
| 700 cyg_drv_mutex_unlock(&dns_mutex); | |
| 701 CYG_REPORT_RETVAL( -EAI_NONE ); | |
| 702 return -EAI_NONE; | |
| 703 } |