Xuyi Wang / mDNS

mDNS

Dependents:   OS

This is a mDNS server.

mDNSResponder.cpp@2:2b00b659497a, 2015-08-14 (annotated)

Committer:
JBRYU
Date:
Fri Aug 14 12:26:23 2015 +0000
Revision:
2:2b00b659497a
Parent:
1:163dc87e95c3
Child:
3:25a82eb200c7
delete unused sets

Who changed what in which revision?

UserRevisionLine numberNew contents of line
JBRYU 0:0df3300689d2 1 /*
JBRYU 0:0df3300689d2 2 ----------------------------------------------------
JBRYU 0:0df3300689d2 3 Made by JB RYU, KOR - 2015
JBRYU 0:0df3300689d2 4
JBRYU 0:0df3300689d2 5 origin - C / mdns-sd on CONTIKI-ipv6(uIP) I'd made
JBRYU 0:0df3300689d2 6
JBRYU 0:0df3300689d2 7 now - C++ (actually singleton C-style process)/
JBRYU 0:0df3300689d2 8 mdns-sd on MBED-ipv4(LWIP)
JBRYU 0:0df3300689d2 9 ----------------------------------------------------
JBRYU 0:0df3300689d2 10 More progressed things than others :
JBRYU 0:0df3300689d2 11 {
JBRYU 2:2b00b659497a 12 Parsing multi-records (OK),
JBRYU 0:0df3300689d2 13 Check duplicated host and avoid (OK)
JBRYU 0:0df3300689d2 14 }
JBRYU 0:0df3300689d2 15
JBRYU 0:0df3300689d2 16 TODO : (Actully these are not necessary for my prj)
JBRYU 0:0df3300689d2 17 {
JBRYU 0:0df3300689d2 18 register multiple service,
JBRYU 0:0df3300689d2 19 managing records-caches
JBRYU 0:0df3300689d2 20 }
JBRYU 0:0df3300689d2 21 ----------------------------------------------------
JBRYU 0:0df3300689d2 22 Notes :
JBRYU 0:0df3300689d2 23 srv-instance-name = host-name
JBRYU 2:2b00b659497a 24 SEP-<rand 2hex><IP 2hex>
JBRYU 0:0df3300689d2 25 ----------------------------------------------------
JBRYU 0:0df3300689d2 26 */
JBRYU 0:0df3300689d2 27
JBRYU 0:0df3300689d2 28
JBRYU 0:0df3300689d2 29 #include "lwip/opt.h"
JBRYU 0:0df3300689d2 30 #include "mbed.h"
JBRYU 0:0df3300689d2 31 #include "EthernetInterface.h"
JBRYU 0:0df3300689d2 32 #include <cstring>
JBRYU 0:0df3300689d2 33 #if LWIP_DNS /* don't build if not configured for use in lwipopts.h */
JBRYU 0:0df3300689d2 34
JBRYU 0:0df3300689d2 35 #include "mDNSResponder.h"
JBRYU 0:0df3300689d2 36 #include "dns-sd.h"
JBRYU 0:0df3300689d2 37
JBRYU 0:0df3300689d2 38 #define MDNS_DBG 1
JBRYU 0:0df3300689d2 39 #if (MDNS_DBG > 0)
JBRYU 0:0df3300689d2 40 #define MDBG(x...) printf(x)
JBRYU 0:0df3300689d2 41 #else
JBRYU 0:0df3300689d2 42 #define MDBG(x...)
JBRYU 0:0df3300689d2 43 #endif
JBRYU 0:0df3300689d2 44
JBRYU 0:0df3300689d2 45 mDNSResponder::mDNSResponder() : IP_str(NULL)
JBRYU 0:0df3300689d2 46 {}
JBRYU 0:0df3300689d2 47
JBRYU 0:0df3300689d2 48 /* initialize static instance */
JBRYU 0:0df3300689d2 49 char mDNSResponder::query_buf[1500] =
JBRYU 0:0df3300689d2 50 {
JBRYU 0:0df3300689d2 51 0,
JBRYU 0:0df3300689d2 52 };
JBRYU 0:0df3300689d2 53
JBRYU 0:0df3300689d2 54 MY_SD_DOMAINS mDNSResponder::SD_domains =
JBRYU 0:0df3300689d2 55 {
JBRYU 0:0df3300689d2 56 .numbers = N_CONTIKI_SERVICES,
JBRYU 0:0df3300689d2 57 .elements =
JBRYU 0:0df3300689d2 58 {
JBRYU 0:0df3300689d2 59 {
JBRYU 0:0df3300689d2 60 .inst_len = 8,
JBRYU 0:0df3300689d2 61 .instance = {'S','E','P','-','0','0','0','0'},
JBRYU 0:0df3300689d2 62 .serv_len = 12,
JBRYU 0:0df3300689d2 63 .service = {'_','s','m','a','r','t','e','n','e','r','g','y',},
JBRYU 0:0df3300689d2 64 .trl_len = 4,
JBRYU 0:0df3300689d2 65 .trl = {'_','t','c','p'},
JBRYU 0:0df3300689d2 66 .domain_len = 5,
JBRYU 0:0df3300689d2 67 .domain = {'l','o','c','a','l'},
JBRYU 0:0df3300689d2 68 .txt =
JBRYU 0:0df3300689d2 69 {
JBRYU 0:0df3300689d2 70 .len_txtvers = 9,
JBRYU 0:0df3300689d2 71 .txtvers = {'t','x','t','v','e','r','s','=','1'},
JBRYU 0:0df3300689d2 72 .len_dcap = 10,
JBRYU 0:0df3300689d2 73 .dcap = {'d','c','a','p','=','/','d','c','a','p'},
JBRYU 0:0df3300689d2 74 .len_path = 9,
JBRYU 0:0df3300689d2 75 .path = {'p','a','t','h','=','/','u','p','t'},
JBRYU 0:0df3300689d2 76 .len_https = 9,
JBRYU 0:0df3300689d2 77 .https = {'h','t','t','p','s','=','4','4','3'},
JBRYU 0:0df3300689d2 78 .len_level = 9,
JBRYU 0:0df3300689d2 79 .level = {'l','e','v','e','l','=','-','S','0'},
JBRYU 0:0df3300689d2 80 }
JBRYU 0:0df3300689d2 81 },
JBRYU 0:0df3300689d2 82 },
JBRYU 0:0df3300689d2 83 };
JBRYU 0:0df3300689d2 84
JBRYU 0:0df3300689d2 85 struct dns_hdr mDNSResponder::SD_res_hdr =
JBRYU 0:0df3300689d2 86 {
JBRYU 0:0df3300689d2 87 .id = 0x0000,
JBRYU 0:0df3300689d2 88 .flags1 = DNS_FLAG1_RESPONSE | DNS_FLAG1_AUTHORATIVE,
JBRYU 0:0df3300689d2 89 .flags2 = 0,
JBRYU 0:0df3300689d2 90 .numquestions = 0,
JBRYU 0:0df3300689d2 91 .numanswers = htons(1),
JBRYU 0:0df3300689d2 92 .numauthrr = 0,
JBRYU 0:0df3300689d2 93 .numextrarr = 0,
JBRYU 0:0df3300689d2 94 };
JBRYU 0:0df3300689d2 95
JBRYU 0:0df3300689d2 96 QR_MAP mDNSResponder::g_queries = {0,};
JBRYU 0:0df3300689d2 97
JBRYU 0:0df3300689d2 98 /* end of initialize static instance */
JBRYU 0:0df3300689d2 99
JBRYU 0:0df3300689d2 100 mDNSResponder::~mDNSResponder()
JBRYU 0:0df3300689d2 101 {
JBRYU 0:0df3300689d2 102 close();
JBRYU 0:0df3300689d2 103 }
JBRYU 0:0df3300689d2 104
JBRYU 0:0df3300689d2 105 void mDNSResponder::
JBRYU 0:0df3300689d2 106 register_service(char* number)
JBRYU 0:0df3300689d2 107 {
JBRYU 0:0df3300689d2 108 memcpy(&SD_domains.elements[0].instance[4], number, 4);
JBRYU 0:0df3300689d2 109 }
JBRYU 0:0df3300689d2 110
JBRYU 0:0df3300689d2 111 void mDNSResponder::
JBRYU 0:0df3300689d2 112 query_domain(void)
JBRYU 0:0df3300689d2 113 {
JBRYU 0:0df3300689d2 114 volatile uint8_t i;
JBRYU 0:0df3300689d2 115 struct dns_hdr* hdr;
JBRYU 0:0df3300689d2 116 struct dns_question* question;
JBRYU 0:0df3300689d2 117 uint8_t *query;
JBRYU 0:0df3300689d2 118
JBRYU 0:0df3300689d2 119 MDBG("start probe duplicate domain\n");
JBRYU 0:0df3300689d2 120
JBRYU 0:0df3300689d2 121 hdr = (struct dns_hdr *)query_buf;
JBRYU 0:0df3300689d2 122
JBRYU 0:0df3300689d2 123 memset(hdr, 0, sizeof(struct dns_hdr));
JBRYU 0:0df3300689d2 124
JBRYU 0:0df3300689d2 125 hdr->id = 0;
JBRYU 0:0df3300689d2 126 hdr->flags1 = DNS_FLAG1_RD;
JBRYU 0:0df3300689d2 127 hdr->numquestions = htons(1);
JBRYU 0:0df3300689d2 128
JBRYU 0:0df3300689d2 129 query = (unsigned char *)query_buf + sizeof(*hdr);
JBRYU 0:0df3300689d2 130
JBRYU 0:0df3300689d2 131 memcpy(query, &SD_domains.elements[0].inst_len,
JBRYU 0:0df3300689d2 132 SD_domains.elements[0].inst_len+1);
JBRYU 0:0df3300689d2 133 query += SD_domains.elements[0].inst_len+1;
JBRYU 0:0df3300689d2 134
JBRYU 0:0df3300689d2 135 memcpy(query, &SD_domains.elements[0].domain_len,
JBRYU 0:0df3300689d2 136 SD_domains.elements[0].domain_len+1);
JBRYU 0:0df3300689d2 137 query += SD_domains.elements[0].domain_len+1;
JBRYU 0:0df3300689d2 138
JBRYU 0:0df3300689d2 139 *query = 0x00;
JBRYU 0:0df3300689d2 140 query++;
JBRYU 0:0df3300689d2 141
JBRYU 0:0df3300689d2 142 question = (struct dns_question*)query;
JBRYU 0:0df3300689d2 143 question->type = htons(DNS_TYPE_ANY);
JBRYU 0:0df3300689d2 144 question->obj = htons(DNS_CLASS_IN);
JBRYU 0:0df3300689d2 145
JBRYU 0:0df3300689d2 146 query += 4;
JBRYU 0:0df3300689d2 147
JBRYU 0:0df3300689d2 148 MDBG("send probe query(%d)\n",
JBRYU 0:0df3300689d2 149 (uint16_t)((uint32_t)query - (uint32_t)query_buf));
JBRYU 0:0df3300689d2 150
JBRYU 0:0df3300689d2 151 mdns_sock.sendTo(send_endpt, query_buf,
JBRYU 0:0df3300689d2 152 (query - (uint8_t *) query_buf));
JBRYU 0:0df3300689d2 153 }
JBRYU 0:0df3300689d2 154
JBRYU 0:0df3300689d2 155 void mDNSResponder::announce(char* ip)
JBRYU 0:0df3300689d2 156 {
JBRYU 0:0df3300689d2 157 send_endpt.set_address(MCAST, MDNS_PORT);
JBRYU 0:0df3300689d2 158
JBRYU 0:0df3300689d2 159 mdns_sock.bind(MDNS_PORT);
JBRYU 0:0df3300689d2 160 if (mdns_sock.join_multicast_group(MCAST) != 0)
JBRYU 0:0df3300689d2 161 {
JBRYU 0:0df3300689d2 162 printf("Error joining the multicast group\n");
JBRYU 0:0df3300689d2 163 while (true) {}
JBRYU 0:0df3300689d2 164 }
JBRYU 0:0df3300689d2 165
JBRYU 0:0df3300689d2 166 IP_str = ip;
JBRYU 0:0df3300689d2 167
JBRYU 0:0df3300689d2 168 IPstringToByte(IP_str);
JBRYU 0:0df3300689d2 169
JBRYU 0:0df3300689d2 170 char instance_number[4];
JBRYU 0:0df3300689d2 171 sprintf(instance_number, "%.2d%.2X",
JBRYU 0:0df3300689d2 172 0, IP_byte[3]);
JBRYU 0:0df3300689d2 173 register_service(instance_number);
JBRYU 0:0df3300689d2 174
JBRYU 0:0df3300689d2 175 query_domain();
JBRYU 0:0df3300689d2 176 }
JBRYU 0:0df3300689d2 177
JBRYU 0:0df3300689d2 178 void mDNSResponder::close()
JBRYU 0:0df3300689d2 179 {
JBRYU 0:0df3300689d2 180 mdns_sock.close();
JBRYU 0:0df3300689d2 181 }
JBRYU 0:0df3300689d2 182
JBRYU 0:0df3300689d2 183 void mDNSResponder::IPstringToByte(char* IPstr)
JBRYU 0:0df3300689d2 184 {
JBRYU 0:0df3300689d2 185 char ip1[4] = {0,}; char ip2[4] = {0,};
JBRYU 0:0df3300689d2 186 char ip3[4] = {0,}; char ip4[4] = {0,};
JBRYU 0:0df3300689d2 187 char* p;
JBRYU 0:0df3300689d2 188 char* p_dot;
JBRYU 0:0df3300689d2 189
JBRYU 0:0df3300689d2 190 p_dot = strstr(IPstr, ".");
JBRYU 0:0df3300689d2 191 memcpy(ip1, IPstr, p_dot-IPstr);
JBRYU 0:0df3300689d2 192 IP_byte[0] = (uint8_t)atoi((const char*)ip1);
JBRYU 0:0df3300689d2 193
JBRYU 0:0df3300689d2 194 p = p_dot + 1;
JBRYU 0:0df3300689d2 195 p_dot = strstr(p, ".");
JBRYU 0:0df3300689d2 196 memcpy(ip2, p, p_dot-p);
JBRYU 0:0df3300689d2 197 IP_byte[1] = (uint8_t)atoi((const char*)ip2);
JBRYU 0:0df3300689d2 198
JBRYU 0:0df3300689d2 199 p = p_dot + 1;
JBRYU 0:0df3300689d2 200 p_dot = strstr(p, ".");
JBRYU 0:0df3300689d2 201 memcpy(ip3, p, p_dot-p);
JBRYU 0:0df3300689d2 202 IP_byte[2] = (uint8_t)atoi((const char*)ip3);
JBRYU 0:0df3300689d2 203
JBRYU 0:0df3300689d2 204 p = p_dot + 1;
JBRYU 0:0df3300689d2 205 memcpy(ip4, p, 3);
JBRYU 0:0df3300689d2 206 IP_byte[3] = (uint8_t)atoi((const char*)ip4);
JBRYU 0:0df3300689d2 207 }
JBRYU 0:0df3300689d2 208
JBRYU 0:0df3300689d2 209 char* mDNSResponder::
JBRYU 0:0df3300689d2 210 skip_name(char* query)
JBRYU 0:0df3300689d2 211 {
JBRYU 0:0df3300689d2 212 unsigned char n;
JBRYU 0:0df3300689d2 213
JBRYU 0:0df3300689d2 214 do
JBRYU 0:0df3300689d2 215 {
JBRYU 0:0df3300689d2 216 n = *query;
JBRYU 0:0df3300689d2 217 if(n & 0xc0)
JBRYU 0:0df3300689d2 218 {
JBRYU 0:0df3300689d2 219 ++query;
JBRYU 0:0df3300689d2 220 break;
JBRYU 0:0df3300689d2 221 }
JBRYU 0:0df3300689d2 222
JBRYU 0:0df3300689d2 223 ++query;
JBRYU 0:0df3300689d2 224
JBRYU 0:0df3300689d2 225 while(n > 0)
JBRYU 0:0df3300689d2 226 {
JBRYU 0:0df3300689d2 227 ++query;
JBRYU 0:0df3300689d2 228 --n;
JBRYU 0:0df3300689d2 229 };
JBRYU 0:0df3300689d2 230 } while(*query != 0);
JBRYU 0:0df3300689d2 231
JBRYU 0:0df3300689d2 232 return query + 1;
JBRYU 0:0df3300689d2 233 }
JBRYU 0:0df3300689d2 234
JBRYU 0:0df3300689d2 235 char* mDNSResponder::
JBRYU 0:0df3300689d2 236 decode_name(char* query, char* packet)
JBRYU 0:0df3300689d2 237 {
JBRYU 0:0df3300689d2 238 char c = 0xff;
JBRYU 0:0df3300689d2 239 static char dest[MAX_DOMAIN_LEN];
JBRYU 0:0df3300689d2 240 int len = 0;
JBRYU 0:0df3300689d2 241
JBRYU 0:0df3300689d2 242 memset(dest, 0, MAX_DOMAIN_LEN);
JBRYU 0:0df3300689d2 243
JBRYU 0:0df3300689d2 244 MDBG("\n");
JBRYU 0:0df3300689d2 245 while((len < MAX_DOMAIN_LEN) && (c != 0x00))
JBRYU 0:0df3300689d2 246 {
JBRYU 0:0df3300689d2 247 c = *query;
JBRYU 0:0df3300689d2 248
JBRYU 0:0df3300689d2 249 while (c == 0xc0)
JBRYU 0:0df3300689d2 250 {
JBRYU 0:0df3300689d2 251 MDBG("%s : read offset\n", __FUNCTION__);
JBRYU 0:0df3300689d2 252 query++;
JBRYU 0:0df3300689d2 253 query = (char*)((uint32_t)packet + *query);
JBRYU 0:0df3300689d2 254 c = *query;
JBRYU 0:0df3300689d2 255 }
JBRYU 0:0df3300689d2 256
JBRYU 0:0df3300689d2 257 memset(&dest[len], c, 1);
JBRYU 0:0df3300689d2 258
JBRYU 0:0df3300689d2 259 query++;
JBRYU 0:0df3300689d2 260 len++;
JBRYU 0:0df3300689d2 261 }
JBRYU 0:0df3300689d2 262
JBRYU 0:0df3300689d2 263 MDBG("\n%s : %s\n", __FUNCTION__, dest);
JBRYU 0:0df3300689d2 264 return dest;
JBRYU 0:0df3300689d2 265 }
JBRYU 0:0df3300689d2 266
JBRYU 0:0df3300689d2 267 void mDNSResponder::
JBRYU 0:0df3300689d2 268 send_dns_ans(struct dns_hdr* hdr)
JBRYU 0:0df3300689d2 269 {
JBRYU 0:0df3300689d2 270 int i = 0;
JBRYU 0:0df3300689d2 271 uint8_t* ptr;
JBRYU 0:0df3300689d2 272 uint32_t off_inst = 0;
JBRYU 0:0df3300689d2 273 uint32_t off_serv = 0;
JBRYU 0:0df3300689d2 274 uint32_t off_domain = 0;
JBRYU 0:0df3300689d2 275 PTR_ANS* ptr_ans;
JBRYU 0:0df3300689d2 276 SRV_ANS* srv_ans;
JBRYU 0:0df3300689d2 277 struct dns_answer* A_ans;
JBRYU 0:0df3300689d2 278 TXT_ANS* txt_ans;
JBRYU 0:0df3300689d2 279 int numbers = g_queries.numbers;
JBRYU 0:0df3300689d2 280
JBRYU 0:0df3300689d2 281 uint8_t ans_mask = DNS_TYPE_ANY; //later, for addtional ans
JBRYU 0:0df3300689d2 282
JBRYU 0:0df3300689d2 283 memcpy(hdr, &SD_res_hdr, sizeof(struct dns_hdr));
JBRYU 0:0df3300689d2 284 hdr->numanswers = htons(numbers);
JBRYU 0:0df3300689d2 285 ptr = (uint8_t*)hdr + sizeof(struct dns_hdr);
JBRYU 0:0df3300689d2 286
JBRYU 0:0df3300689d2 287 while (numbers--)
JBRYU 0:0df3300689d2 288 {
JBRYU 0:0df3300689d2 289 switch (g_queries.reqs[i])
JBRYU 0:0df3300689d2 290 {
JBRYU 0:0df3300689d2 291 case DNS_TYPE_PTR :
JBRYU 0:0df3300689d2 292 ans_mask = ans_mask ^ DNS_TYPE_PTR;
JBRYU 0:0df3300689d2 293 if (off_serv == 0)
JBRYU 0:0df3300689d2 294 {
JBRYU 0:0df3300689d2 295 off_serv = (uint32_t)ptr - (uint32_t)hdr;
JBRYU 0:0df3300689d2 296
JBRYU 0:0df3300689d2 297 memcpy(ptr, &SD_domains.elements[0].serv_len,
JBRYU 0:0df3300689d2 298 SD_domains.elements[0].serv_len + 1);
JBRYU 0:0df3300689d2 299 ptr += SD_domains.elements[0].serv_len + 1;
JBRYU 0:0df3300689d2 300
JBRYU 0:0df3300689d2 301 memcpy(ptr, &SD_domains.elements[0].trl_len,
JBRYU 0:0df3300689d2 302 SD_domains.elements[0].trl_len + 1);
JBRYU 0:0df3300689d2 303 ptr += SD_domains.elements[0].trl_len + 1;
JBRYU 0:0df3300689d2 304
JBRYU 0:0df3300689d2 305 memcpy(ptr, &SD_domains.elements[0].domain_len,
JBRYU 0:0df3300689d2 306 SD_domains.elements[0].domain_len + 1);
JBRYU 0:0df3300689d2 307 ptr += SD_domains.elements[0].domain_len + 1;
JBRYU 0:0df3300689d2 308 *ptr = 0x00;
JBRYU 0:0df3300689d2 309 ptr++;
JBRYU 0:0df3300689d2 310 }
JBRYU 0:0df3300689d2 311 else
JBRYU 0:0df3300689d2 312 {
JBRYU 0:0df3300689d2 313 *ptr = 0xc0;
JBRYU 0:0df3300689d2 314 ptr++;
JBRYU 0:0df3300689d2 315 *ptr = (uint8_t)off_serv;
JBRYU 0:0df3300689d2 316 ptr++;
JBRYU 0:0df3300689d2 317 }
JBRYU 0:0df3300689d2 318
JBRYU 0:0df3300689d2 319 ptr_ans = (PTR_ANS*)ptr;
JBRYU 0:0df3300689d2 320
JBRYU 0:0df3300689d2 321 ptr_ans->type = htons(DNS_TYPE_PTR);
JBRYU 0:0df3300689d2 322 ptr_ans->obj = htons(DNS_CLASS_IN);
JBRYU 0:0df3300689d2 323 ptr_ans->ttl[0] = 0;
JBRYU 0:0df3300689d2 324 ptr_ans->ttl[1] = htons(120);
JBRYU 0:0df3300689d2 325
JBRYU 0:0df3300689d2 326 int instance_len = SD_domains.elements[0].inst_len;
JBRYU 0:0df3300689d2 327
JBRYU 0:0df3300689d2 328 ptr = (uint8_t*)ptr_ans->name;
JBRYU 0:0df3300689d2 329
JBRYU 0:0df3300689d2 330 if (off_inst == 0)
JBRYU 0:0df3300689d2 331 {
JBRYU 0:0df3300689d2 332 off_inst = (uint32_t)ptr - (uint32_t)hdr;
JBRYU 0:0df3300689d2 333
JBRYU 0:0df3300689d2 334 ptr_ans->len = htons(instance_len + 3);
JBRYU 0:0df3300689d2 335
JBRYU 0:0df3300689d2 336 memcpy(ptr_ans->name,
JBRYU 0:0df3300689d2 337 &SD_domains.elements[0].inst_len,
JBRYU 0:0df3300689d2 338 1 + SD_domains.elements[0].inst_len);
JBRYU 0:0df3300689d2 339
JBRYU 0:0df3300689d2 340 ptr += instance_len + 1;
JBRYU 0:0df3300689d2 341 *ptr = 0xc0;
JBRYU 0:0df3300689d2 342 ptr++;
JBRYU 0:0df3300689d2 343 *ptr = (uint8_t)off_serv;
JBRYU 0:0df3300689d2 344 ptr++;
JBRYU 0:0df3300689d2 345 }
JBRYU 0:0df3300689d2 346 else
JBRYU 0:0df3300689d2 347 {
JBRYU 0:0df3300689d2 348 ptr_ans->len = htons(2);
JBRYU 0:0df3300689d2 349
JBRYU 0:0df3300689d2 350 *ptr = 0xc0;
JBRYU 0:0df3300689d2 351 ptr++;
JBRYU 0:0df3300689d2 352 *ptr = (uint8_t)off_inst;
JBRYU 0:0df3300689d2 353 ptr++;
JBRYU 0:0df3300689d2 354 }
JBRYU 0:0df3300689d2 355 break;
JBRYU 0:0df3300689d2 356 case DNS_TYPE_SRV :
JBRYU 0:0df3300689d2 357 ans_mask = ans_mask ^ DNS_TYPE_SRV;
JBRYU 0:0df3300689d2 358 if (off_inst == 0)
JBRYU 0:0df3300689d2 359 {
JBRYU 0:0df3300689d2 360 off_inst = (uint32_t)ptr - (uint32_t)hdr;
JBRYU 0:0df3300689d2 361
JBRYU 0:0df3300689d2 362 memcpy(ptr,
JBRYU 0:0df3300689d2 363 &SD_domains.elements[0].inst_len,
JBRYU 0:0df3300689d2 364 1 + SD_domains.elements[0].inst_len);
JBRYU 0:0df3300689d2 365
JBRYU 0:0df3300689d2 366 ptr += 1 + SD_domains.elements[0].inst_len;
JBRYU 0:0df3300689d2 367
JBRYU 0:0df3300689d2 368 if (off_serv == 0)
JBRYU 0:0df3300689d2 369 {
JBRYU 0:0df3300689d2 370 off_serv = (uint32_t)ptr - (uint32_t)hdr;
JBRYU 0:0df3300689d2 371
JBRYU 0:0df3300689d2 372 memcpy(ptr, &SD_domains.elements[0].serv_len,
JBRYU 0:0df3300689d2 373 SD_domains.elements[0].serv_len + 1);
JBRYU 0:0df3300689d2 374 ptr += SD_domains.elements[0].serv_len + 1;
JBRYU 0:0df3300689d2 375
JBRYU 0:0df3300689d2 376 memcpy(ptr, &SD_domains.elements[0].trl_len,
JBRYU 0:0df3300689d2 377 SD_domains.elements[0].trl_len + 1);
JBRYU 0:0df3300689d2 378 ptr += SD_domains.elements[0].trl_len + 1;
JBRYU 0:0df3300689d2 379
JBRYU 0:0df3300689d2 380 memcpy(ptr, &SD_domains.elements[0].domain_len,
JBRYU 0:0df3300689d2 381 SD_domains.elements[0].domain_len + 1);
JBRYU 0:0df3300689d2 382 ptr += SD_domains.elements[0].domain_len + 1;
JBRYU 0:0df3300689d2 383
JBRYU 0:0df3300689d2 384 *ptr = 0x00;
JBRYU 0:0df3300689d2 385 ptr++;
JBRYU 0:0df3300689d2 386 }
JBRYU 0:0df3300689d2 387 else
JBRYU 0:0df3300689d2 388 {
JBRYU 0:0df3300689d2 389 *ptr = 0xc0;
JBRYU 0:0df3300689d2 390 ptr++;
JBRYU 0:0df3300689d2 391 *ptr = (uint8_t)off_serv;
JBRYU 0:0df3300689d2 392 ptr++;
JBRYU 0:0df3300689d2 393 }
JBRYU 0:0df3300689d2 394 }
JBRYU 0:0df3300689d2 395 else
JBRYU 0:0df3300689d2 396 {
JBRYU 0:0df3300689d2 397 *ptr = 0xc0;
JBRYU 0:0df3300689d2 398 ptr++;
JBRYU 0:0df3300689d2 399 *ptr = (uint8_t)off_inst;
JBRYU 0:0df3300689d2 400 ptr++;
JBRYU 0:0df3300689d2 401 }
JBRYU 0:0df3300689d2 402
JBRYU 0:0df3300689d2 403 srv_ans = (SRV_ANS*)(ptr);
JBRYU 0:0df3300689d2 404 srv_ans->type = htons(DNS_TYPE_SRV);
JBRYU 0:0df3300689d2 405 srv_ans->obj = htons(DNS_CLASS_IN | DNS_CASH_FLUSH);
JBRYU 0:0df3300689d2 406 srv_ans->ttl[0] = 0;
JBRYU 0:0df3300689d2 407 srv_ans->ttl[1] = htons(120);
JBRYU 0:0df3300689d2 408 srv_ans->pri = 0;
JBRYU 0:0df3300689d2 409 srv_ans->wei = 0;
JBRYU 0:0df3300689d2 410 srv_ans->port = htons(8080);
JBRYU 0:0df3300689d2 411 ptr = (uint8_t*)srv_ans->name;
JBRYU 0:0df3300689d2 412
JBRYU 0:0df3300689d2 413 if (off_domain == 0)
JBRYU 0:0df3300689d2 414 {
JBRYU 0:0df3300689d2 415 off_domain = (uint32_t)ptr - (uint32_t)hdr;
JBRYU 0:0df3300689d2 416
JBRYU 0:0df3300689d2 417 memcpy(ptr,
JBRYU 0:0df3300689d2 418 &SD_domains.elements[0].inst_len,
JBRYU 0:0df3300689d2 419 1 + SD_domains.elements[0].inst_len);
JBRYU 0:0df3300689d2 420
JBRYU 0:0df3300689d2 421 ptr += 1 + SD_domains.elements[0].inst_len;
JBRYU 0:0df3300689d2 422
JBRYU 0:0df3300689d2 423 memcpy(ptr,
JBRYU 0:0df3300689d2 424 &SD_domains.elements[0].domain_len,
JBRYU 0:0df3300689d2 425 1 + SD_domains.elements[0].domain_len);
JBRYU 0:0df3300689d2 426
JBRYU 0:0df3300689d2 427 ptr+= 1 + SD_domains.elements[0].domain_len;
JBRYU 0:0df3300689d2 428 *ptr = 0x00;
JBRYU 0:0df3300689d2 429 ptr++;
JBRYU 0:0df3300689d2 430 }
JBRYU 0:0df3300689d2 431 else
JBRYU 0:0df3300689d2 432 {
JBRYU 0:0df3300689d2 433 *ptr = 0xc0;
JBRYU 0:0df3300689d2 434 ptr++;
JBRYU 0:0df3300689d2 435 *ptr = (uint8_t)off_domain;
JBRYU 0:0df3300689d2 436 ptr++;
JBRYU 0:0df3300689d2 437 }
JBRYU 0:0df3300689d2 438 srv_ans->len =
JBRYU 0:0df3300689d2 439 htons((uint16_t)((uint32_t)ptr - (uint32_t)&srv_ans->pri));
JBRYU 0:0df3300689d2 440
JBRYU 0:0df3300689d2 441 break;
JBRYU 0:0df3300689d2 442 case DNS_TYPE_TXT :
JBRYU 0:0df3300689d2 443 ans_mask = ans_mask ^ DNS_TYPE_TXT;
JBRYU 0:0df3300689d2 444 if (off_inst == 0)
JBRYU 0:0df3300689d2 445 {
JBRYU 0:0df3300689d2 446 off_inst = (uint32_t)ptr - (uint32_t)hdr;
JBRYU 0:0df3300689d2 447
JBRYU 0:0df3300689d2 448 memcpy(ptr,
JBRYU 0:0df3300689d2 449 &SD_domains.elements[0].inst_len,
JBRYU 0:0df3300689d2 450 1 + SD_domains.elements[0].inst_len);
JBRYU 0:0df3300689d2 451
JBRYU 0:0df3300689d2 452 ptr += 1 + SD_domains.elements[0].inst_len;
JBRYU 0:0df3300689d2 453
JBRYU 0:0df3300689d2 454 if (off_serv == 0)
JBRYU 0:0df3300689d2 455 {
JBRYU 0:0df3300689d2 456 off_serv = (uint32_t)ptr - (uint32_t)hdr;
JBRYU 0:0df3300689d2 457
JBRYU 0:0df3300689d2 458 memcpy(ptr, &SD_domains.elements[0].serv_len,
JBRYU 0:0df3300689d2 459 SD_domains.elements[0].serv_len + 1);
JBRYU 0:0df3300689d2 460 ptr += SD_domains.elements[0].serv_len + 1;
JBRYU 0:0df3300689d2 461
JBRYU 0:0df3300689d2 462 memcpy(ptr, &SD_domains.elements[0].trl_len,
JBRYU 0:0df3300689d2 463 SD_domains.elements[0].trl_len + 1);
JBRYU 0:0df3300689d2 464 ptr += SD_domains.elements[0].trl_len + 1;
JBRYU 0:0df3300689d2 465
JBRYU 0:0df3300689d2 466 memcpy(ptr, &SD_domains.elements[0].domain_len,
JBRYU 0:0df3300689d2 467 SD_domains.elements[0].domain_len + 1);
JBRYU 0:0df3300689d2 468 ptr += SD_domains.elements[0].domain_len + 1;
JBRYU 0:0df3300689d2 469
JBRYU 0:0df3300689d2 470 *ptr = 0x00;
JBRYU 0:0df3300689d2 471 ptr++;
JBRYU 0:0df3300689d2 472 }
JBRYU 0:0df3300689d2 473 else
JBRYU 0:0df3300689d2 474 {
JBRYU 0:0df3300689d2 475 *ptr = 0xc0;
JBRYU 0:0df3300689d2 476 ptr++;
JBRYU 0:0df3300689d2 477 *ptr = (uint8_t)off_serv;
JBRYU 0:0df3300689d2 478 ptr++;
JBRYU 0:0df3300689d2 479 }
JBRYU 0:0df3300689d2 480 }
JBRYU 0:0df3300689d2 481 else
JBRYU 0:0df3300689d2 482 {
JBRYU 0:0df3300689d2 483 *ptr = 0xc0;
JBRYU 0:0df3300689d2 484 ptr++;
JBRYU 0:0df3300689d2 485 *ptr = (uint8_t)off_inst;
JBRYU 0:0df3300689d2 486 ptr++;
JBRYU 0:0df3300689d2 487 }
JBRYU 0:0df3300689d2 488
JBRYU 0:0df3300689d2 489 txt_ans = (TXT_ANS*)(ptr);
JBRYU 0:0df3300689d2 490 txt_ans->type = htons(DNS_TYPE_TXT);
JBRYU 0:0df3300689d2 491 txt_ans->obj = htons(DNS_CLASS_IN | DNS_CASH_FLUSH);
JBRYU 0:0df3300689d2 492 txt_ans->ttl[0] = 0;
JBRYU 0:0df3300689d2 493 txt_ans->ttl[1] = htons(120);
JBRYU 0:0df3300689d2 494 ptr = (uint8_t*)txt_ans->txt;
JBRYU 0:0df3300689d2 495
JBRYU 0:0df3300689d2 496 memcpy(ptr,
JBRYU 0:0df3300689d2 497 &SD_domains.elements[0].txt.len_txtvers,
JBRYU 0:0df3300689d2 498 1 + SD_domains.elements[0].txt.len_txtvers);
JBRYU 0:0df3300689d2 499 ptr += 1 + SD_domains.elements[0].txt.len_txtvers;
JBRYU 0:0df3300689d2 500
JBRYU 0:0df3300689d2 501 memcpy(ptr,
JBRYU 0:0df3300689d2 502 &SD_domains.elements[0].txt.len_dcap,
JBRYU 0:0df3300689d2 503 1 + SD_domains.elements[0].txt.len_dcap);
JBRYU 0:0df3300689d2 504 ptr += 1 + SD_domains.elements[0].txt.len_dcap;
JBRYU 0:0df3300689d2 505
JBRYU 0:0df3300689d2 506 memcpy(ptr,
JBRYU 0:0df3300689d2 507 &SD_domains.elements[0].txt.len_path,
JBRYU 0:0df3300689d2 508 1 + SD_domains.elements[0].txt.len_path);
JBRYU 0:0df3300689d2 509 ptr += 1 + SD_domains.elements[0].txt.len_path;
JBRYU 0:0df3300689d2 510
JBRYU 0:0df3300689d2 511 memcpy(ptr,
JBRYU 0:0df3300689d2 512 &SD_domains.elements[0].txt.len_https,
JBRYU 0:0df3300689d2 513 1 + SD_domains.elements[0].txt.len_https);
JBRYU 0:0df3300689d2 514 ptr += 1 + SD_domains.elements[0].txt.len_https;
JBRYU 0:0df3300689d2 515
JBRYU 0:0df3300689d2 516 memcpy(ptr,
JBRYU 0:0df3300689d2 517 &SD_domains.elements[0].txt.len_level,
JBRYU 0:0df3300689d2 518 1 + SD_domains.elements[0].txt.len_level);
JBRYU 0:0df3300689d2 519 ptr += 1 + SD_domains.elements[0].txt.len_level;
JBRYU 0:0df3300689d2 520
JBRYU 0:0df3300689d2 521 txt_ans->len =
JBRYU 0:0df3300689d2 522 htons((uint16_t)((uint32_t)ptr - (uint32_t)txt_ans->txt));
JBRYU 0:0df3300689d2 523
JBRYU 0:0df3300689d2 524 break;
JBRYU 0:0df3300689d2 525 case DNS_TYPE_A :
JBRYU 0:0df3300689d2 526 ans_mask = ans_mask ^ DNS_TYPE_A;
JBRYU 0:0df3300689d2 527 if (off_domain == 0)
JBRYU 0:0df3300689d2 528 {
JBRYU 0:0df3300689d2 529 off_domain = (uint32_t)ptr - (uint32_t)hdr;
JBRYU 0:0df3300689d2 530
JBRYU 0:0df3300689d2 531 memcpy(ptr,
JBRYU 0:0df3300689d2 532 &SD_domains.elements[0].inst_len,
JBRYU 0:0df3300689d2 533 1 + SD_domains.elements[0].inst_len);
JBRYU 0:0df3300689d2 534
JBRYU 0:0df3300689d2 535 ptr += 1 + SD_domains.elements[0].inst_len;
JBRYU 0:0df3300689d2 536
JBRYU 0:0df3300689d2 537 memcpy(ptr,
JBRYU 0:0df3300689d2 538 &SD_domains.elements[0].domain_len,
JBRYU 0:0df3300689d2 539 1 + SD_domains.elements[0].domain_len);
JBRYU 0:0df3300689d2 540
JBRYU 0:0df3300689d2 541 ptr += 1 + SD_domains.elements[0].domain_len;
JBRYU 0:0df3300689d2 542 *ptr = 0x00;
JBRYU 0:0df3300689d2 543 ptr++;
JBRYU 0:0df3300689d2 544 }
JBRYU 0:0df3300689d2 545 else
JBRYU 0:0df3300689d2 546 {
JBRYU 0:0df3300689d2 547 *ptr = 0xc0;
JBRYU 0:0df3300689d2 548 ptr++;
JBRYU 0:0df3300689d2 549 *ptr = (uint8_t)off_domain;
JBRYU 0:0df3300689d2 550 ptr++;
JBRYU 0:0df3300689d2 551 }
JBRYU 0:0df3300689d2 552
JBRYU 0:0df3300689d2 553 A_ans = (struct dns_answer*)(ptr);
JBRYU 0:0df3300689d2 554
JBRYU 0:0df3300689d2 555 A_ans->type = htons(DNS_TYPE_A);
JBRYU 0:0df3300689d2 556 A_ans->obj = htons(DNS_CLASS_IN | DNS_CASH_FLUSH);
JBRYU 0:0df3300689d2 557 A_ans->ttl[0] = 0;
JBRYU 0:0df3300689d2 558 A_ans->ttl[1] = htons(120);
JBRYU 0:0df3300689d2 559 A_ans->len = htons(4);
JBRYU 0:0df3300689d2 560 memcpy((uint8_t*)A_ans->ipaddr,
JBRYU 0:0df3300689d2 561 IP_byte, 4);
JBRYU 0:0df3300689d2 562
JBRYU 0:0df3300689d2 563 ptr = (uint8_t*)&A_ans->ipaddr + 4;
JBRYU 0:0df3300689d2 564 break;
JBRYU 0:0df3300689d2 565
JBRYU 0:0df3300689d2 566 default :
JBRYU 0:0df3300689d2 567 break;
JBRYU 0:0df3300689d2 568 }
JBRYU 0:0df3300689d2 569 i++;
JBRYU 0:0df3300689d2 570 }
JBRYU 0:0df3300689d2 571
JBRYU 0:0df3300689d2 572 int send_len = ptr - (uint8_t*)hdr;
JBRYU 0:0df3300689d2 573
JBRYU 0:0df3300689d2 574 mdns_sock.sendTo(send_endpt, (char*)hdr, send_len);
JBRYU 0:0df3300689d2 575 }
JBRYU 0:0df3300689d2 576
JBRYU 0:0df3300689d2 577 void mDNSResponder::
JBRYU 0:0df3300689d2 578 MDNS_process(void const *args)
JBRYU 0:0df3300689d2 579 {
JBRYU 0:0df3300689d2 580 char rcv_buf[ 1500 ];
JBRYU 0:0df3300689d2 581 uint8_t nquestions, nanswers;
JBRYU 0:0df3300689d2 582 struct dns_hdr* hdr;
JBRYU 0:0df3300689d2 583 char *queryptr;
JBRYU 0:0df3300689d2 584 uint8_t is_request;
JBRYU 0:0df3300689d2 585 int len;
JBRYU 0:0df3300689d2 586
JBRYU 0:0df3300689d2 587 MDBG("MDNS Process\n");
JBRYU 0:0df3300689d2 588
JBRYU 0:0df3300689d2 589 while ((len = mdns_sock.receiveFrom(rcv_endpt,
JBRYU 0:0df3300689d2 590 rcv_buf, sizeof(rcv_buf))) != 0)
JBRYU 0:0df3300689d2 591 {
JBRYU 0:0df3300689d2 592 hdr = (struct dns_hdr *)rcv_buf;
JBRYU 0:0df3300689d2 593 queryptr = (char *)hdr + sizeof(*hdr);
JBRYU 0:0df3300689d2 594 is_request = ((hdr->flags1 & ~1) == 0) && (hdr->flags2 == 0);
JBRYU 0:0df3300689d2 595 nquestions = (uint8_t) ntohs(hdr->numquestions);
JBRYU 0:0df3300689d2 596 nanswers = (uint8_t) ntohs(hdr->numanswers);
JBRYU 0:0df3300689d2 597
JBRYU 0:0df3300689d2 598 MDBG("resolver: flags1=0x%02X flags2=0x%02X nquestions=%d,\
JBRYU 0:0df3300689d2 599 nanswers=%d, nauthrr=%d, nextrarr=%d\n",\
JBRYU 0:0df3300689d2 600 hdr->flags1, hdr->flags2, (uint8_t) nquestions, (uint8_t) nanswers,\
JBRYU 0:0df3300689d2 601 (uint8_t) ntohs(hdr->numauthrr),\
JBRYU 0:0df3300689d2 602 (uint8_t) ntohs(hdr->numextrarr));
JBRYU 0:0df3300689d2 603
JBRYU 0:0df3300689d2 604 if(hdr->id != 0)
JBRYU 0:0df3300689d2 605 {
JBRYU 0:0df3300689d2 606 return;
JBRYU 0:0df3300689d2 607 }
JBRYU 0:0df3300689d2 608
JBRYU 0:0df3300689d2 609 /** ANSWER HANDLING SECTION ************************************************/
JBRYU 0:0df3300689d2 610 struct dns_question* question = (struct dns_question *)skip_name(queryptr);
JBRYU 0:0df3300689d2 611
JBRYU 0:0df3300689d2 612 uint16_t type;
JBRYU 0:0df3300689d2 613
JBRYU 0:0df3300689d2 614 if (is_request)
JBRYU 0:0df3300689d2 615 {
JBRYU 0:0df3300689d2 616 char* name;
JBRYU 0:0df3300689d2 617
JBRYU 0:0df3300689d2 618 memset(&g_queries, 0, sizeof(QR_MAP));
JBRYU 0:0df3300689d2 619
JBRYU 0:0df3300689d2 620 while (nquestions--)
JBRYU 0:0df3300689d2 621 {
JBRYU 0:0df3300689d2 622 type = ntohs(question->type);
JBRYU 0:0df3300689d2 623 name = decode_name(queryptr, (char*)hdr);
JBRYU 0:0df3300689d2 624
JBRYU 0:0df3300689d2 625 if ((type & DNS_TYPE_PTR) == DNS_TYPE_PTR)
JBRYU 0:0df3300689d2 626 {
JBRYU 0:0df3300689d2 627 if (strncmp((const char*)name,
JBRYU 0:0df3300689d2 628 (const char*)&SD_domains.elements[0].serv_len,
JBRYU 0:0df3300689d2 629 SD_domains.elements[0].serv_len + 1) == 0)
JBRYU 0:0df3300689d2 630 {
JBRYU 0:0df3300689d2 631 MDBG("recv PTR request\n");
JBRYU 0:0df3300689d2 632 g_queries.reqs[g_queries.numbers] = DNS_TYPE_PTR;
JBRYU 0:0df3300689d2 633 g_queries.numbers++;
JBRYU 0:0df3300689d2 634 }
JBRYU 0:0df3300689d2 635 }
JBRYU 0:0df3300689d2 636
JBRYU 0:0df3300689d2 637 if ((type & DNS_TYPE_SRV) == DNS_TYPE_SRV)
JBRYU 0:0df3300689d2 638 {
JBRYU 0:0df3300689d2 639 if ((strncmp((const char*)name,
JBRYU 0:0df3300689d2 640 (const char*)&SD_domains.elements[0].inst_len,
JBRYU 0:0df3300689d2 641 SD_domains.elements[0].inst_len + 1) == 0) &&
JBRYU 0:0df3300689d2 642 (strncmp((const char*)(name + SD_domains.elements[0].inst_len+1),
JBRYU 0:0df3300689d2 643 (const char*)&SD_domains.elements[0].serv_len,
JBRYU 0:0df3300689d2 644 SD_domains.elements[0].serv_len+1) == 0))
JBRYU 0:0df3300689d2 645 {
JBRYU 0:0df3300689d2 646 MDBG("recv SRV request\n");
JBRYU 0:0df3300689d2 647 g_queries.reqs[g_queries.numbers] = DNS_TYPE_SRV;
JBRYU 0:0df3300689d2 648 g_queries.numbers++;
JBRYU 0:0df3300689d2 649 }
JBRYU 0:0df3300689d2 650 }
JBRYU 0:0df3300689d2 651
JBRYU 0:0df3300689d2 652 if ((type & DNS_TYPE_TXT) == DNS_TYPE_TXT)
JBRYU 0:0df3300689d2 653 {
JBRYU 0:0df3300689d2 654 if ((strncmp((const char*)name,
JBRYU 0:0df3300689d2 655 (const char*)&SD_domains.elements[0].inst_len,
JBRYU 0:0df3300689d2 656 SD_domains.elements[0].inst_len + 1) == 0) &&
JBRYU 0:0df3300689d2 657 (strncmp((const char*)(name + SD_domains.elements[0].inst_len+1),
JBRYU 0:0df3300689d2 658 (const char*)&SD_domains.elements[0].serv_len,
JBRYU 0:0df3300689d2 659 SD_domains.elements[0].serv_len+1) == 0))
JBRYU 0:0df3300689d2 660 {
JBRYU 0:0df3300689d2 661 MDBG("recv TXT request\n");
JBRYU 0:0df3300689d2 662 g_queries.reqs[g_queries.numbers] = DNS_TYPE_TXT;
JBRYU 0:0df3300689d2 663 g_queries.numbers++;
JBRYU 0:0df3300689d2 664 }
JBRYU 0:0df3300689d2 665 }
JBRYU 0:0df3300689d2 666
JBRYU 0:0df3300689d2 667 if ((type & DNS_TYPE_A) == DNS_TYPE_A)
JBRYU 0:0df3300689d2 668 {
JBRYU 0:0df3300689d2 669 if ((strncmp((const char*)name,
JBRYU 0:0df3300689d2 670 (const char*)&SD_domains.elements[0].inst_len,
JBRYU 0:0df3300689d2 671 SD_domains.elements[0].inst_len + 1) == 0) &&
JBRYU 0:0df3300689d2 672 (strncmp((const char*)(name + SD_domains.elements[0].inst_len+1),
JBRYU 0:0df3300689d2 673 (const char*)&SD_domains.elements[0].domain_len,
JBRYU 0:0df3300689d2 674 SD_domains.elements[0].domain_len+1) == 0))
JBRYU 0:0df3300689d2 675 {
JBRYU 0:0df3300689d2 676 MDBG("recv AAAA request\n");
JBRYU 0:0df3300689d2 677 g_queries.reqs[g_queries.numbers] = DNS_TYPE_A;
JBRYU 0:0df3300689d2 678 g_queries.numbers++;
JBRYU 0:0df3300689d2 679 }
JBRYU 0:0df3300689d2 680 }
JBRYU 0:0df3300689d2 681
JBRYU 0:0df3300689d2 682 queryptr = (char*)question + sizeof(struct dns_question);
JBRYU 0:0df3300689d2 683 question = (struct dns_question *)skip_name(queryptr);
JBRYU 0:0df3300689d2 684 }
JBRYU 0:0df3300689d2 685
JBRYU 0:0df3300689d2 686 if (g_queries.numbers)
JBRYU 0:0df3300689d2 687 send_dns_ans(hdr);
JBRYU 0:0df3300689d2 688 }
JBRYU 0:0df3300689d2 689 else
JBRYU 0:0df3300689d2 690 {
JBRYU 0:0df3300689d2 691 if (strncmp((const char*)queryptr,
JBRYU 0:0df3300689d2 692 (const char*)&SD_domains.elements[0].inst_len,
JBRYU 0:0df3300689d2 693 SD_domains.elements[0].inst_len + 1) == 0)
JBRYU 0:0df3300689d2 694 {
JBRYU 0:0df3300689d2 695 type = ntohs(question->type);
JBRYU 0:0df3300689d2 696 if (type == DNS_TYPE_A || type == DNS_TYPE_A)
JBRYU 0:0df3300689d2 697 {
JBRYU 0:0df3300689d2 698 char instance_number[4];
JBRYU 0:0df3300689d2 699 sprintf(instance_number, "%.2d%.2X",
JBRYU 0:0df3300689d2 700 (uint8_t)(rand()%100),
JBRYU 0:0df3300689d2 701 IP_byte[3]);
JBRYU 0:0df3300689d2 702 register_service(instance_number);
JBRYU 0:0df3300689d2 703 query_domain();
JBRYU 0:0df3300689d2 704 }
JBRYU 0:0df3300689d2 705 }
JBRYU 0:0df3300689d2 706 }
JBRYU 0:0df3300689d2 707
JBRYU 0:0df3300689d2 708 }
JBRYU 0:0df3300689d2 709 }
JBRYU 0:0df3300689d2 710 #endif
JBRYU 0:0df3300689d2 711