Jacob Erlbeck | 51a869c | 2013-10-15 12:00:26 +0200 | [diff] [blame] | 1 | /* test routines for gbproxy |
| 2 | * send NS messages to the gbproxy and dumps what happens |
| 3 | * (C) 2013 by sysmocom s.f.m.c. GmbH |
| 4 | * Author: Jacob Erlbeck <jerlbeck@sysmocom.de> |
| 5 | */ |
| 6 | |
| 7 | #undef _GNU_SOURCE |
| 8 | #define _GNU_SOURCE |
| 9 | |
| 10 | #include <stdio.h> |
| 11 | #include <stdlib.h> |
| 12 | #include <stdint.h> |
| 13 | #include <string.h> |
| 14 | #include <getopt.h> |
| 15 | #include <dlfcn.h> |
| 16 | #include <sys/types.h> |
| 17 | #include <sys/socket.h> |
| 18 | |
| 19 | #include <osmocom/core/msgb.h> |
| 20 | #include <osmocom/core/application.h> |
| 21 | #include <osmocom/core/utils.h> |
| 22 | #include <osmocom/core/logging.h> |
| 23 | #include <osmocom/core/talloc.h> |
| 24 | #include <osmocom/core/signal.h> |
| 25 | #include <osmocom/core/rate_ctr.h> |
| 26 | #include <osmocom/gprs/gprs_msgb.h> |
| 27 | #include <osmocom/gprs/gprs_ns.h> |
| 28 | #include <osmocom/gprs/gprs_bssgp.h> |
| 29 | |
| 30 | #include <openbsc/gb_proxy.h> |
| 31 | |
| 32 | #define REMOTE_BSS_ADDR 0x01020304 |
| 33 | #define REMOTE_SGSN_ADDR 0x05060708 |
| 34 | |
| 35 | #define SGSN_NSEI 0xfffe |
| 36 | |
| 37 | struct gbproxy_config gbcfg; |
| 38 | |
| 39 | static int gprs_process_message(struct gprs_ns_inst *nsi, const char *text, struct sockaddr_in *peer, const unsigned char* data, size_t data_len); |
| 40 | |
| 41 | static void send_ns_reset(struct gprs_ns_inst *nsi, struct sockaddr_in *src_addr, |
| 42 | enum ns_cause cause, uint16_t nsvci, uint16_t nsei) |
| 43 | { |
| 44 | /* GPRS Network Service, PDU type: NS_RESET, |
| 45 | */ |
| 46 | unsigned char msg[12] = { |
| 47 | 0x02, 0x00, 0x81, 0x01, 0x01, 0x82, 0x11, 0x22, |
| 48 | 0x04, 0x82, 0x11, 0x22 |
| 49 | }; |
| 50 | |
| 51 | msg[3] = cause; |
| 52 | msg[6] = nsvci / 256; |
| 53 | msg[7] = nsvci % 256; |
| 54 | msg[10] = nsei / 256; |
| 55 | msg[11] = nsei % 256; |
| 56 | |
| 57 | gprs_process_message(nsi, "RESET", src_addr, msg, sizeof(msg)); |
| 58 | } |
| 59 | |
| 60 | static void send_ns_alive(struct gprs_ns_inst *nsi, struct sockaddr_in *src_addr) |
| 61 | { |
| 62 | /* GPRS Network Service, PDU type: NS_ALIVE */ |
| 63 | unsigned char msg[1] = { |
| 64 | 0x0a |
| 65 | }; |
| 66 | |
| 67 | gprs_process_message(nsi, "ALIVE", src_addr, msg, sizeof(msg)); |
| 68 | } |
| 69 | |
| 70 | static void send_ns_alive_ack(struct gprs_ns_inst *nsi, struct sockaddr_in *src_addr) |
| 71 | { |
| 72 | /* GPRS Network Service, PDU type: NS_ALIVE_ACK */ |
| 73 | unsigned char msg[1] = { |
| 74 | 0x0b |
| 75 | }; |
| 76 | |
| 77 | gprs_process_message(nsi, "ALIVE_ACK", src_addr, msg, sizeof(msg)); |
| 78 | } |
| 79 | |
| 80 | static void send_ns_unblock(struct gprs_ns_inst *nsi, struct sockaddr_in *src_addr) |
| 81 | { |
| 82 | /* GPRS Network Service, PDU type: NS_UNBLOCK */ |
| 83 | unsigned char msg[1] = { |
| 84 | 0x06 |
| 85 | }; |
| 86 | |
| 87 | gprs_process_message(nsi, "UNBLOCK", src_addr, msg, sizeof(msg)); |
| 88 | } |
| 89 | |
| 90 | static void send_ns_unitdata(struct gprs_ns_inst *nsi, struct sockaddr_in *src_addr, |
| 91 | uint16_t nsbvci, |
| 92 | const unsigned char *bssgp_msg, size_t bssgp_msg_size) |
| 93 | { |
| 94 | /* GPRS Network Service, PDU type: NS_UNITDATA */ |
| 95 | unsigned char msg[4096] = { |
| 96 | 0x00, 0x00, 0x00, 0x00 |
| 97 | }; |
| 98 | |
| 99 | OSMO_ASSERT(bssgp_msg_size <= sizeof(msg) - 4); |
| 100 | |
| 101 | msg[2] = nsbvci / 256; |
| 102 | msg[3] = nsbvci % 256; |
| 103 | memcpy(msg + 4, bssgp_msg, bssgp_msg_size); |
| 104 | |
| 105 | gprs_process_message(nsi, "UNITDATA", src_addr, msg, bssgp_msg_size + 4); |
| 106 | } |
| 107 | |
| 108 | static void send_bssgp_reset(struct gprs_ns_inst *nsi, struct sockaddr_in *src_addr, |
| 109 | uint16_t bvci) |
| 110 | { |
| 111 | /* GPRS Network Service, PDU type: NS_UNITDATA, BVCI 0 |
| 112 | * BSSGP RESET */ |
| 113 | unsigned char msg[22] = { |
| 114 | 0x22, 0x04, 0x82, 0x4a, |
| 115 | 0x2e, 0x07, 0x81, 0x08, 0x08, 0x88, 0x10, 0x20, |
| 116 | 0x30, 0x40, 0x50, 0x60, 0x10, 0x00 |
| 117 | }; |
| 118 | |
| 119 | msg[3] = bvci / 256; |
| 120 | msg[4] = bvci % 256; |
| 121 | |
| 122 | send_ns_unitdata(nsi, src_addr, 0, msg, sizeof(msg)); |
| 123 | } |
| 124 | |
| 125 | static void setup_ns(struct gprs_ns_inst *nsi, struct sockaddr_in *src_addr, |
| 126 | uint16_t nsvci, uint16_t nsei) |
| 127 | { |
| 128 | printf("Setup NS-VC: remote 0x%08x:%d, " |
| 129 | "NSVCI 0x%04x(%d), NSEI 0x%04x(%d)\n\n", |
| 130 | ntohl(src_addr->sin_addr.s_addr), ntohs(src_addr->sin_port), |
| 131 | nsvci, nsvci, nsei, nsei); |
| 132 | |
| 133 | send_ns_reset(nsi, src_addr, NS_CAUSE_OM_INTERVENTION, nsvci, nsei); |
| 134 | send_ns_alive(nsi, src_addr); |
| 135 | send_ns_unblock(nsi, src_addr); |
| 136 | send_ns_alive_ack(nsi, src_addr); |
| 137 | } |
| 138 | |
| 139 | static void setup_bssgp(struct gprs_ns_inst *nsi, struct sockaddr_in *src_addr, |
| 140 | uint16_t bvci) |
| 141 | { |
| 142 | printf("Setup BSSGP: remote 0x%08x:%d, " |
| 143 | "BVCI 0x%04x(%d)\n\n", |
| 144 | ntohl(src_addr->sin_addr.s_addr), ntohs(src_addr->sin_port), |
| 145 | bvci, bvci); |
| 146 | |
| 147 | send_bssgp_reset(nsi, src_addr, bvci); |
| 148 | } |
| 149 | |
| 150 | int gprs_ns_rcvmsg(struct gprs_ns_inst *nsi, struct msgb *msg, |
| 151 | struct sockaddr_in *saddr, enum gprs_ns_ll ll); |
| 152 | |
| 153 | /* override */ |
| 154 | int gprs_ns_callback(enum gprs_ns_evt event, struct gprs_nsvc *nsvc, |
| 155 | struct msgb *msg, uint16_t bvci) |
| 156 | { |
| 157 | printf("CALLBACK, event %d, msg length %d, bvci 0x%04x\n%s\n\n", |
| 158 | event, msgb_bssgp_len(msg), bvci, |
| 159 | osmo_hexdump(msgb_bssgph(msg), msgb_bssgp_len(msg))); |
| 160 | |
| 161 | switch (event) { |
| 162 | case GPRS_NS_EVT_UNIT_DATA: |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame^] | 163 | return gbprox_rcvmsg(msg, nsvc->nsei, bvci, nsvc->nsvci); |
Jacob Erlbeck | 51a869c | 2013-10-15 12:00:26 +0200 | [diff] [blame] | 164 | default: |
| 165 | break; |
| 166 | } |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | /* override */ |
| 171 | ssize_t sendto(int sockfd, const void *buf, size_t len, int flags, |
| 172 | const struct sockaddr *dest_addr, socklen_t addrlen) |
| 173 | { |
| 174 | typedef ssize_t (*sendto_t)(int, const void *, size_t, int, |
| 175 | const struct sockaddr *, socklen_t); |
| 176 | static sendto_t real_sendto = NULL; |
| 177 | uint32_t dest_host = htonl(((struct sockaddr_in *)dest_addr)->sin_addr.s_addr); |
| 178 | |
| 179 | if (!real_sendto) |
| 180 | real_sendto = dlsym(RTLD_NEXT, "sendto"); |
| 181 | |
| 182 | if (dest_host == REMOTE_BSS_ADDR) |
| 183 | printf("MESSAGE to BSS, msg length %d\n%s\n\n", len, osmo_hexdump(buf, len)); |
| 184 | else if (dest_host == REMOTE_SGSN_ADDR) |
| 185 | printf("MESSAGE to SGSN, msg length %d\n%s\n\n", len, osmo_hexdump(buf, len)); |
| 186 | else |
| 187 | return real_sendto(sockfd, buf, len, flags, dest_addr, addrlen); |
| 188 | |
| 189 | return len; |
| 190 | } |
| 191 | |
| 192 | /* override */ |
| 193 | int gprs_ns_sendmsg(struct gprs_ns_inst *nsi, struct msgb *msg) |
| 194 | { |
| 195 | uint16_t bvci = msgb_bvci(msg); |
| 196 | uint16_t nsei = msgb_nsei(msg); |
| 197 | |
| 198 | unsigned char *buf = msg->data; |
| 199 | size_t len = msg->len; |
| 200 | |
| 201 | if (nsei == SGSN_NSEI) |
| 202 | printf("NS UNITDATA MESSAGE to SGSN, BVCI 0x%04x, msg length %d\n%s\n\n", |
| 203 | bvci, len, osmo_hexdump(buf, len)); |
| 204 | else |
| 205 | printf("NS UNITDATA MESSAGE to BSS, BVCI 0x%04x, msg length %d\n%s\n\n", |
| 206 | bvci, len, osmo_hexdump(buf, len)); |
| 207 | |
| 208 | return 0; |
| 209 | } |
| 210 | |
| 211 | static void dump_rate_ctr_group(FILE *stream, const char *prefix, |
| 212 | struct rate_ctr_group *ctrg) |
| 213 | { |
| 214 | unsigned int i; |
| 215 | |
| 216 | for (i = 0; i < ctrg->desc->num_ctr; i++) { |
| 217 | struct rate_ctr *ctr = &ctrg->ctr[i]; |
| 218 | if (ctr->current && !strchr(ctrg->desc->ctr_desc[i].name, '.')) |
| 219 | fprintf(stream, " %s%s: %llu%s", |
| 220 | prefix, ctrg->desc->ctr_desc[i].description, |
| 221 | (long long)ctr->current, |
| 222 | "\n"); |
| 223 | }; |
| 224 | } |
| 225 | |
| 226 | /* Signal handler for signals from NS layer */ |
| 227 | static int test_signal(unsigned int subsys, unsigned int signal, |
| 228 | void *handler_data, void *signal_data) |
| 229 | { |
| 230 | struct ns_signal_data *nssd = signal_data; |
| 231 | int rc; |
| 232 | |
| 233 | if (subsys != SS_L_NS) |
| 234 | return 0; |
| 235 | |
| 236 | switch (signal) { |
| 237 | case S_NS_RESET: |
| 238 | printf("==> got signal NS_RESET, NS-VC 0x%04x/%s\n", |
| 239 | nssd->nsvc->nsvci, |
| 240 | gprs_ns_ll_str(nssd->nsvc)); |
| 241 | break; |
| 242 | |
| 243 | case S_NS_ALIVE_EXP: |
| 244 | printf("==> got signal NS_ALIVE_EXP, NS-VC 0x%04x/%s\n", |
| 245 | nssd->nsvc->nsvci, |
| 246 | gprs_ns_ll_str(nssd->nsvc)); |
| 247 | break; |
| 248 | |
| 249 | case S_NS_BLOCK: |
| 250 | printf("==> got signal NS_BLOCK, NS-VC 0x%04x/%s\n", |
| 251 | nssd->nsvc->nsvci, |
| 252 | gprs_ns_ll_str(nssd->nsvc)); |
| 253 | break; |
| 254 | |
| 255 | case S_NS_UNBLOCK: |
| 256 | printf("==> got signal NS_UNBLOCK, NS-VC 0x%04x/%s\n", |
| 257 | nssd->nsvc->nsvci, |
| 258 | gprs_ns_ll_str(nssd->nsvc)); |
| 259 | break; |
| 260 | |
| 261 | case S_NS_REPLACED: |
| 262 | printf("==> got signal NS_REPLACED: 0x%04x/%s", |
| 263 | nssd->nsvc->nsvci, |
| 264 | gprs_ns_ll_str(nssd->nsvc)); |
| 265 | printf(" -> 0x%04x/%s\n", |
| 266 | nssd->old_nsvc->nsvci, |
| 267 | gprs_ns_ll_str(nssd->old_nsvc)); |
| 268 | break; |
| 269 | |
| 270 | default: |
| 271 | printf("==> got signal %d, NS-VC 0x%04x/%s\n", signal, |
| 272 | nssd->nsvc->nsvci, |
| 273 | gprs_ns_ll_str(nssd->nsvc)); |
| 274 | break; |
| 275 | } |
| 276 | printf("\n"); |
| 277 | rc = gbprox_signal(subsys, signal, handler_data, signal_data); |
| 278 | return rc; |
| 279 | } |
| 280 | |
| 281 | static int gprs_process_message(struct gprs_ns_inst *nsi, const char *text, struct sockaddr_in *peer, const unsigned char* data, size_t data_len) |
| 282 | { |
| 283 | struct msgb *msg; |
| 284 | int ret; |
| 285 | if (data_len > NS_ALLOC_SIZE - NS_ALLOC_HEADROOM) { |
| 286 | fprintf(stderr, "message too long: %d\n", data_len); |
| 287 | return -1; |
| 288 | } |
| 289 | |
| 290 | msg = gprs_ns_msgb_alloc(); |
| 291 | memmove(msg->data, data, data_len); |
| 292 | msg->l2h = msg->data; |
| 293 | msgb_put(msg, data_len); |
| 294 | |
| 295 | printf("PROCESSING %s from 0x%08x:%d\n%s\n\n", |
| 296 | text, ntohl(peer->sin_addr.s_addr), ntohs(peer->sin_port), |
| 297 | osmo_hexdump(data, data_len)); |
| 298 | |
| 299 | ret = gprs_ns_rcvmsg(nsi, msg, peer, GPRS_NS_LL_UDP); |
| 300 | |
| 301 | printf("result (%s) = %d\n\n", text, ret); |
| 302 | |
| 303 | msgb_free(msg); |
| 304 | |
| 305 | return ret; |
| 306 | } |
| 307 | |
| 308 | static void gprs_dump_nsi(struct gprs_ns_inst *nsi) |
| 309 | { |
| 310 | struct gprs_nsvc *nsvc; |
| 311 | |
| 312 | printf("Current NS-VCIs:\n"); |
| 313 | llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { |
| 314 | struct sockaddr_in *peer = &(nsvc->ip.bts_addr); |
| 315 | printf(" VCI 0x%04x, NSEI 0x%04x, peer 0x%08x:%d\n", |
| 316 | nsvc->nsvci, nsvc->nsei, |
| 317 | ntohl(peer->sin_addr.s_addr), ntohs(peer->sin_port) |
| 318 | ); |
| 319 | dump_rate_ctr_group(stdout, " ", nsvc->ctrg); |
| 320 | } |
| 321 | printf("\n"); |
| 322 | } |
| 323 | |
| 324 | static void test_gbproxy() |
| 325 | { |
| 326 | struct gprs_ns_inst *nsi = gprs_ns_instantiate(gprs_ns_callback, NULL); |
| 327 | struct sockaddr_in bss_peer[4] = {{0},}; |
| 328 | |
| 329 | bssgp_nsi = nsi; |
| 330 | gbcfg.nsi = bssgp_nsi; |
| 331 | gbcfg.nsip_sgsn_nsei = SGSN_NSEI; |
| 332 | |
| 333 | bss_peer[0].sin_family = AF_INET; |
| 334 | bss_peer[0].sin_port = htons(1111); |
| 335 | bss_peer[0].sin_addr.s_addr = htonl(REMOTE_BSS_ADDR); |
| 336 | bss_peer[1].sin_family = AF_INET; |
| 337 | bss_peer[1].sin_port = htons(2222); |
| 338 | bss_peer[1].sin_addr.s_addr = htonl(REMOTE_BSS_ADDR); |
| 339 | bss_peer[2].sin_family = AF_INET; |
| 340 | bss_peer[2].sin_port = htons(3333); |
| 341 | bss_peer[2].sin_addr.s_addr = htonl(REMOTE_BSS_ADDR); |
| 342 | bss_peer[3].sin_family = AF_INET; |
| 343 | bss_peer[3].sin_port = htons(4444); |
| 344 | bss_peer[3].sin_addr.s_addr = htonl(REMOTE_BSS_ADDR); |
| 345 | |
| 346 | printf("--- Initialise BSS 1 ---\n\n"); |
| 347 | |
| 348 | setup_ns(nsi, &bss_peer[0], 0x1001, 0x1000); |
| 349 | setup_bssgp(nsi, &bss_peer[0], 0x1002); |
| 350 | gprs_dump_nsi(nsi); |
| 351 | gbprox_dump_peers(stdout, 0); |
| 352 | |
| 353 | printf("--- Initialise BSS 2 ---\n\n"); |
| 354 | |
| 355 | setup_ns(nsi, &bss_peer[1], 0x2001, 0x2000); |
| 356 | setup_bssgp(nsi, &bss_peer[1], 0x2002); |
| 357 | gprs_dump_nsi(nsi); |
| 358 | gbprox_dump_peers(stdout, 0); |
| 359 | |
| 360 | printf("--- Move BSS 1 to new port ---\n\n"); |
| 361 | |
| 362 | setup_ns(nsi, &bss_peer[2], 0x1001, 0x1000); |
| 363 | gprs_dump_nsi(nsi); |
| 364 | gbprox_dump_peers(stdout, 0); |
| 365 | |
| 366 | printf("--- Move BSS 2 to former BSS 1 port ---\n\n"); |
| 367 | |
| 368 | setup_ns(nsi, &bss_peer[0], 0x2001, 0x2000); |
| 369 | gprs_dump_nsi(nsi); |
| 370 | gbprox_dump_peers(stdout, 0); |
| 371 | |
| 372 | printf("--- Move BSS 1 to current BSS 2 port ---\n\n"); |
| 373 | |
| 374 | setup_ns(nsi, &bss_peer[0], 0x2001, 0x2000); |
| 375 | gprs_dump_nsi(nsi); |
| 376 | gbprox_dump_peers(stdout, 0); |
| 377 | |
| 378 | printf("--- Move BSS 2 to new port ---\n\n"); |
| 379 | |
| 380 | setup_ns(nsi, &bss_peer[3], 0x2001, 0x2000); |
| 381 | gprs_dump_nsi(nsi); |
| 382 | gbprox_dump_peers(stdout, 0); |
| 383 | |
| 384 | printf("--- Move BSS 2 to former BSS 1 port ---\n\n"); |
| 385 | |
| 386 | setup_ns(nsi, &bss_peer[2], 0x2001, 0x2000); |
| 387 | gprs_dump_nsi(nsi); |
| 388 | gbprox_dump_peers(stdout, 0); |
| 389 | |
| 390 | gprs_ns_destroy(nsi); |
| 391 | nsi = NULL; |
| 392 | } |
| 393 | |
| 394 | |
| 395 | static struct log_info info = {}; |
| 396 | |
| 397 | int main(int argc, char **argv) |
| 398 | { |
| 399 | osmo_init_logging(&info); |
| 400 | log_set_use_color(osmo_stderr_target, 0); |
| 401 | log_set_print_filename(osmo_stderr_target, 0); |
| 402 | osmo_signal_register_handler(SS_L_NS, &test_signal, NULL); |
| 403 | |
| 404 | printf("===== NS protocol test START\n"); |
| 405 | test_gbproxy(); |
| 406 | printf("===== NS protocol test END\n\n"); |
| 407 | |
| 408 | exit(EXIT_SUCCESS); |
| 409 | } |