1 /* -*- c -*- */ 2 /* 3 * Copyright 2014 Christopher D. Kilgour techie AT whiterocker.com 4 * 5 * This file is part of libbtbb 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with libbtbb; see the file COPYING. If not, write to 19 * the Free Software Foundation, Inc., 51 Franklin Street, 20 * Boston, MA 02110-1301, USA. 21 */ 22 #include "bluetooth_le_packet.h" 23 #include "bluetooth_packet.h" 24 #include "btbb.h" 25 #include "pcap-common.h" 26 27 #include <stdlib.h> 28 #include <string.h> 29 #include <assert.h> 30 31 typedef enum { 32 PCAP_OK = 0, 33 PCAP_INVALID_HANDLE, 34 PCAP_FILE_NOT_ALLOWED, 35 PCAP_NO_MEMORY, 36 } PCAP_RESULT; 37 38 typedef struct __attribute__((packed)) pcap_hdr_s { 39 uint32_t magic_number; /* magic number */ 40 uint16_t version_major; /* major version number */ 41 uint16_t version_minor; /* minor version number */ 42 int32_t thiszone; /* GMT to local correction */ 43 uint32_t sigfigs; /* accuracy of timestamps */ 44 uint32_t snaplen; /* max length of captured packets, in octets */ 45 uint32_t network; /* data link type */ 46 } pcap_hdr_t; 47 48 FILE *btbb_pcap_open(const char *filename, uint32_t dlt, uint32_t snaplen) { 49 pcap_hdr_t pcap_header = { 50 .magic_number = 0xa1b2c3d4, 51 .version_major = 2, 52 .version_minor = 4, 53 .thiszone = 0, 54 .sigfigs = 0, 55 .snaplen = snaplen, 56 .network = dlt, 57 }; 58 59 FILE *pcap_file = fopen(filename, "w"); 60 if (pcap_file == NULL) return NULL; 61 62 fwrite(&pcap_header, sizeof(pcap_header), 1, pcap_file); 63 64 return pcap_file; 65 } 66 67 /* BT BR/EDR support */ 68 69 struct btbb_pcap_handle { 70 FILE *pcap_file; 71 }; 72 73 int 74 btbb_pcap_create_file(const char *filename, btbb_pcap_handle ** ph) 75 { 76 int retval = 0; 77 btbb_pcap_handle * handle = malloc( sizeof(btbb_pcap_handle) ); 78 if (handle) { 79 memset(handle, 0, sizeof(*handle)); 80 handle->pcap_file = btbb_pcap_open(filename, DLT_BLUETOOTH_BREDR_BB, 81 BREDR_MAX_PAYLOAD); 82 if (handle->pcap_file) { 83 *ph = handle; 84 } 85 else { 86 perror("PCAP error:"); 87 retval = -PCAP_FILE_NOT_ALLOWED; 88 goto fail; 89 } 90 } 91 else { 92 retval = -PCAP_NO_MEMORY; 93 goto fail; 94 } 95 return retval; 96 fail: 97 (void) btbb_pcap_close( handle ); 98 return retval; 99 } 100 101 typedef struct __attribute__((packed)) pcaprec_hdr_s { 102 uint32 ts_sec; /* timestamp seconds */ 103 uint32 ts_usec; /* timestamp microseconds */ 104 uint32 incl_len; /* number of octets of packet saved in file */ 105 uint32 orig_len; /* actual length of packet */ 106 } pcaprec_hdr_t; 107 108 typedef struct { 109 pcaprec_hdr_t pcap_header; 110 pcap_bluetooth_bredr_bb_header bredr_bb_header; 111 uint8_t bredr_payload[BREDR_MAX_PAYLOAD]; 112 } pcap_bredr_packet; 113 114 void btbb_pcap_dump(FILE *file, pcaprec_hdr_t *pcap_header, u_char *data) { 115 fwrite(pcap_header, sizeof(*pcap_header), 1, file); 116 fwrite(data, pcap_header->incl_len, 1, file); 117 fflush(file); 118 } 119 120 static void 121 assemble_pcapng_bredr_packet( pcap_bredr_packet * pkt, 122 const uint32_t interface_id __attribute__((unused)), 123 const uint64_t ns, 124 const uint32_t caplen, 125 const uint8_t rf_channel, 126 const int8_t signal_power, 127 const int8_t noise_power, 128 const uint8_t access_code_offenses, 129 const uint8_t payload_transport, 130 const uint8_t payload_rate, 131 const uint8_t corrected_header_bits, 132 const int16_t corrected_payload_bits, 133 const uint32_t lap, 134 const uint32_t ref_lap, 135 const uint8_t ref_uap, 136 const uint32_t bt_header, 137 const uint16_t flags, 138 const uint8_t * payload ) 139 { 140 uint32_t pcap_caplen = sizeof(pcap_bluetooth_bredr_bb_header)+caplen; 141 uint32_t reflapuap = (ref_lap&0xffffff) | (ref_uap<<24); 142 143 pkt->pcap_header.ts_sec = ns / 1000000000ull; 144 pkt->pcap_header.ts_usec = ns % 1000000000ull; 145 pkt->pcap_header.incl_len = pcap_caplen; 146 pkt->pcap_header.orig_len = pcap_caplen; 147 148 pkt->bredr_bb_header.rf_channel = rf_channel; 149 pkt->bredr_bb_header.signal_power = signal_power; 150 pkt->bredr_bb_header.noise_power = noise_power; 151 pkt->bredr_bb_header.access_code_offenses = access_code_offenses; 152 pkt->bredr_bb_header.payload_transport_rate = 153 (payload_transport << 4) | payload_rate; 154 pkt->bredr_bb_header.corrected_header_bits = corrected_header_bits; 155 pkt->bredr_bb_header.corrected_payload_bits = htole16( corrected_payload_bits ); 156 pkt->bredr_bb_header.lap = htole32( lap ); 157 pkt->bredr_bb_header.ref_lap_uap = htole32( reflapuap ); 158 pkt->bredr_bb_header.bt_header = htole16( bt_header ); 159 pkt->bredr_bb_header.flags = htole16( flags ); 160 if (caplen) { 161 assert(caplen <= sizeof(pkt->bredr_payload)); // caller ensures this, but to be safe.. 162 (void) memcpy( &pkt->bredr_payload[0], payload, caplen ); 163 } 164 else { 165 pkt->bredr_bb_header.flags &= htole16( ~BREDR_PAYLOAD_PRESENT ); 166 } 167 } 168 169 int 170 btbb_pcap_append_packet(btbb_pcap_handle * h, const uint64_t ns, 171 const int8_t sigdbm, const int8_t noisedbm, 172 const uint32_t reflap, const uint8_t refuap, 173 const btbb_packet *pkt) 174 { 175 if (h && h->pcap_file) { 176 uint16_t flags = BREDR_DEWHITENED | BREDR_SIGPOWER_VALID | 177 ((noisedbm < sigdbm) ? BREDR_NOISEPOWER_VALID : 0) | 178 ((reflap != LAP_ANY) ? BREDR_REFLAP_VALID : 0) | 179 ((refuap != UAP_ANY) ? BREDR_REFUAP_VALID : 0); 180 uint32_t caplen = (uint32_t) btbb_packet_get_payload_length(pkt); 181 uint8_t payload_bytes[caplen]; 182 btbb_get_payload_packed( pkt, (char *) &payload_bytes[0] ); 183 caplen = MIN(BREDR_MAX_PAYLOAD, caplen); 184 pcap_bredr_packet pcap_pkt; 185 assemble_pcapng_bredr_packet( &pcap_pkt, 186 0, 187 ns, 188 caplen, 189 btbb_packet_get_channel(pkt), 190 sigdbm, 191 noisedbm, 192 btbb_packet_get_ac_errors(pkt), 193 btbb_packet_get_transport(pkt), 194 btbb_packet_get_modulation(pkt), 195 0, /* TODO: corrected header bits */ 196 0, /* TODO: corrected payload bits */ 197 btbb_packet_get_lap(pkt), 198 reflap, 199 refuap, 200 btbb_packet_get_header_packed(pkt), 201 flags, 202 payload_bytes ); 203 btbb_pcap_dump(h->pcap_file, &pcap_pkt.pcap_header, (u_char *)&pcap_pkt.bredr_bb_header); 204 return 0; 205 } 206 return -PCAP_INVALID_HANDLE; 207 } 208 209 int 210 btbb_pcap_close(btbb_pcap_handle * h) 211 { 212 if (h && h->pcap_file) { 213 fclose(h->pcap_file); 214 } 215 if (h) { 216 free(h); 217 return 0; 218 } 219 return -PCAP_INVALID_HANDLE; 220 } 221 222 /* BTLE support */ 223 224 struct lell_pcap_handle { 225 FILE *pcap_file; 226 int dlt; 227 uint8_t btle_ppi_version; 228 }; 229 230 static int 231 lell_pcap_create_file_dlt(const char *filename, int dlt, lell_pcap_handle ** ph) 232 { 233 int retval = 0; 234 lell_pcap_handle * handle = malloc( sizeof(lell_pcap_handle) ); 235 if (handle) { 236 memset(handle, 0, sizeof(*handle)); 237 handle->pcap_file = btbb_pcap_open(filename, dlt, BREDR_MAX_PAYLOAD); 238 if (handle->pcap_file) { 239 handle->dlt = dlt; 240 *ph = handle; 241 } 242 else { 243 retval = -PCAP_FILE_NOT_ALLOWED; 244 goto fail; 245 } 246 } 247 else { 248 retval = -PCAP_NO_MEMORY; 249 goto fail; 250 } 251 return retval; 252 fail: 253 (void) lell_pcap_close( handle ); 254 return retval; 255 } 256 257 int 258 lell_pcap_create_file(const char *filename, lell_pcap_handle ** ph) 259 { 260 return lell_pcap_create_file_dlt(filename, DLT_BLUETOOTH_LE_LL_WITH_PHDR, ph); 261 } 262 263 int 264 lell_pcap_ppi_create_file(const char *filename, int btle_ppi_version, 265 lell_pcap_handle ** ph) 266 { 267 int retval = lell_pcap_create_file_dlt(filename, DLT_PPI, ph); 268 if (!retval) { 269 (*ph)->btle_ppi_version = btle_ppi_version; 270 } 271 return retval; 272 } 273 274 typedef struct { 275 pcaprec_hdr_t pcap_header; 276 pcap_bluetooth_le_ll_header le_ll_header; 277 uint8_t le_packet[LE_MAX_PAYLOAD]; 278 } pcap_le_packet; 279 280 static void 281 assemble_pcapng_le_packet( pcap_le_packet * pkt, 282 const uint32_t interface_id __attribute__((unused)), 283 const uint64_t ns, 284 const uint32_t caplen, 285 const uint8_t rf_channel, 286 const int8_t signal_power, 287 const int8_t noise_power, 288 const uint8_t access_address_offenses, 289 const uint32_t ref_access_address, 290 const uint16_t flags, 291 const uint8_t * lepkt ) 292 { 293 uint32_t incl_len = MIN(LE_MAX_PAYLOAD, caplen); 294 295 pkt->pcap_header.ts_sec = ns / 1000000000ull; 296 pkt->pcap_header.ts_usec = ns % 1000000000ull; 297 pkt->pcap_header.incl_len = sizeof(pcap_bluetooth_le_ll_header)+caplen; 298 pkt->pcap_header.orig_len = sizeof(pcap_bluetooth_le_ll_header)+incl_len; 299 300 pkt->le_ll_header.rf_channel = rf_channel; 301 pkt->le_ll_header.signal_power = signal_power; 302 pkt->le_ll_header.noise_power = noise_power; 303 pkt->le_ll_header.access_address_offenses = access_address_offenses; 304 pkt->le_ll_header.ref_access_address = htole32( ref_access_address ); 305 pkt->le_ll_header.flags = htole16( flags ); 306 (void) memcpy( &pkt->le_packet[0], lepkt, incl_len ); 307 } 308 309 int 310 lell_pcap_append_packet(lell_pcap_handle * h, const uint64_t ns, 311 const int8_t sigdbm, const int8_t noisedbm, 312 const uint32_t refAA, const lell_packet *pkt) 313 { 314 if (h && h->pcap_file && 315 (h->dlt == DLT_BLUETOOTH_LE_LL_WITH_PHDR)) { 316 uint16_t flags = LE_DEWHITENED | LE_AA_OFFENSES_VALID | 317 LE_SIGPOWER_VALID | 318 ((noisedbm < sigdbm) ? LE_NOISEPOWER_VALID : 0) | 319 (lell_packet_is_data(pkt) ? 0 : LE_REF_AA_VALID); 320 pcap_le_packet pcap_pkt; 321 assemble_pcapng_le_packet( &pcap_pkt, 322 0, 323 ns, 324 pkt->length + 4 + 2 + 3, // AA + header + CRC 325 pkt->channel_k, 326 sigdbm, 327 noisedbm, 328 pkt->access_address_offenses, 329 refAA, 330 flags, 331 &pkt->symbols[0] ); 332 btbb_pcap_dump(h->pcap_file, &pcap_pkt.pcap_header, (u_char *)&pcap_pkt.le_ll_header); 333 return 0; 334 } 335 return -PCAP_INVALID_HANDLE; 336 } 337 338 #define PPI_BTLE 30006 339 340 typedef struct __attribute__((packed)) { 341 uint8_t pph_version; 342 uint8_t pph_flags; 343 uint16_t pph_len; 344 uint32_t pph_dlt; 345 } ppi_packet_header_t; 346 347 typedef struct __attribute__((packed)) { 348 uint16_t pfh_type; 349 uint16_t pfh_datalen; 350 } ppi_fieldheader_t; 351 352 typedef struct __attribute__((packed)) { 353 uint8_t btle_version; 354 uint16_t btle_channel; 355 uint8_t btle_clkn_high; 356 uint32_t btle_clk100ns; 357 int8_t rssi_max; 358 int8_t rssi_min; 359 int8_t rssi_avg; 360 uint8_t rssi_count; 361 } ppi_btle_t; 362 363 typedef struct __attribute__((packed)) { 364 pcaprec_hdr_t pcap_header; 365 ppi_packet_header_t ppi_packet_header; 366 ppi_fieldheader_t ppi_fieldheader; 367 ppi_btle_t le_ll_ppi_header; 368 uint8_t le_packet[LE_MAX_PAYLOAD]; 369 } pcap_ppi_le_packet; 370 371 int 372 lell_pcap_append_ppi_packet(lell_pcap_handle * h, const uint64_t ns, 373 const uint8_t clkn_high, 374 const int8_t rssi_min, const int8_t rssi_max, 375 const int8_t rssi_avg, const uint8_t rssi_count, 376 const lell_packet *pkt) 377 { 378 if (h && h->pcap_file && 379 (h->dlt == DLT_PPI)) { 380 pcap_ppi_le_packet pcap_pkt; 381 const uint16_t pcap_headerlen = 382 sizeof(ppi_packet_header_t) + 383 sizeof(ppi_fieldheader_t) + 384 sizeof(ppi_btle_t); 385 uint16_t MHz = 2402 + 2*lell_get_channel_k(pkt); 386 unsigned packet_len = pkt->length + 4 + 2 + 3; // AA + header + CRC 387 unsigned incl_len = MIN(LE_MAX_PAYLOAD, packet_len); 388 389 pcap_pkt.pcap_header.ts_sec = ns / 1000000000ull; 390 pcap_pkt.pcap_header.ts_usec = ns % 1000000000ull; 391 pcap_pkt.pcap_header.incl_len = pcap_headerlen + incl_len; 392 pcap_pkt.pcap_header.orig_len = pcap_headerlen + packet_len; 393 394 pcap_pkt.ppi_packet_header.pph_version = 0; 395 pcap_pkt.ppi_packet_header.pph_flags = 0; 396 pcap_pkt.ppi_packet_header.pph_len = htole16(pcap_headerlen); 397 pcap_pkt.ppi_packet_header.pph_dlt = htole32(DLT_USER0); 398 399 pcap_pkt.ppi_fieldheader.pfh_type = htole16(PPI_BTLE); 400 pcap_pkt.ppi_fieldheader.pfh_datalen = htole16(sizeof(ppi_btle_t)); 401 402 pcap_pkt.le_ll_ppi_header.btle_version = h->btle_ppi_version; 403 pcap_pkt.le_ll_ppi_header.btle_channel = htole16(MHz); 404 pcap_pkt.le_ll_ppi_header.btle_clkn_high = clkn_high; 405 pcap_pkt.le_ll_ppi_header.btle_clk100ns = htole32(pkt->clk100ns); 406 pcap_pkt.le_ll_ppi_header.rssi_max = rssi_max; 407 pcap_pkt.le_ll_ppi_header.rssi_min = rssi_min; 408 pcap_pkt.le_ll_ppi_header.rssi_avg = rssi_avg; 409 pcap_pkt.le_ll_ppi_header.rssi_count = rssi_count; 410 (void) memcpy( &pcap_pkt.le_packet[0], &pkt->symbols[0], incl_len); 411 btbb_pcap_dump(h->pcap_file, &pcap_pkt.pcap_header, (u_char *)&pcap_pkt.ppi_packet_header); 412 return 0; 413 } 414 return -PCAP_INVALID_HANDLE; 415 } 416 417 int 418 lell_pcap_close(lell_pcap_handle *h) 419 { 420 if (h && h->pcap_file) { 421 fclose(h->pcap_file); 422 } 423 if (h) { 424 free(h); 425 return 0; 426 } 427 return -PCAP_INVALID_HANDLE; 428 } 429