jjako | 52c2414 | 2002-12-16 13:33:51 +0000 | [diff] [blame] | 1 | /* |
| 2 | * OpenGGSN - Gateway GPRS Support Node |
| 3 | * Copyright (C) 2002 Mondru AB. |
| 4 | * |
| 5 | * The contents of this file may be used under the terms of the GNU |
| 6 | * General Public License Version 2, provided that the above copyright |
| 7 | * notice and this permission notice is included in all copies or |
| 8 | * substantial portions of the software. |
| 9 | * |
| 10 | * The initial developer of the original code is |
| 11 | * Jens Jakobsen <jj@openggsn.org> |
| 12 | * |
| 13 | * Contributor(s): |
| 14 | * |
| 15 | */ |
| 16 | |
| 17 | /* |
| 18 | * sgsnemu.c |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | |
| 23 | #ifdef __linux__ |
| 24 | #define _GNU_SOURCE 1 /* strdup() prototype, broken arpa/inet.h */ |
| 25 | #endif |
| 26 | |
| 27 | |
| 28 | #include <syslog.h> |
| 29 | #include <ctype.h> |
| 30 | #include <netdb.h> |
| 31 | #include <signal.h> |
| 32 | #include <stdio.h> |
| 33 | #include <string.h> |
| 34 | #include <stdlib.h> |
| 35 | #include <sys/types.h> |
| 36 | #include <sys/socket.h> |
| 37 | #include <netinet/in.h> |
| 38 | #include <arpa/inet.h> |
| 39 | #include <sys/wait.h> |
| 40 | #include <sys/stat.h> |
| 41 | #include <unistd.h> |
| 42 | #include <sys/socket.h> |
| 43 | #include <sys/ioctl.h> |
| 44 | #include <net/if.h> |
| 45 | #include <features.h> |
| 46 | #include <errno.h> |
| 47 | #include <asm/types.h> |
| 48 | #include <sys/socket.h> |
| 49 | #include <linux/netlink.h> |
| 50 | #include <resolv.h> |
| 51 | #include <time.h> |
| 52 | |
| 53 | #include "tun.h" |
| 54 | #include "../gtp/pdp.h" |
| 55 | #include "../gtp/gtp.h" |
| 56 | #include "cmdline.h" |
| 57 | |
| 58 | /* State variable */ |
| 59 | /* 0: Idle */ |
| 60 | /* 1: Wait_connect */ |
| 61 | /* 2: Connected */ |
| 62 | /* 3: Wait_disconnect */ |
| 63 | int state = 0; |
| 64 | |
| 65 | int maxfd = 0; /* For select() */ |
| 66 | int tun_fd = -1; /* Network file descriptor */ |
| 67 | struct tun_t *tun; /* TUN instance */ |
| 68 | struct tun_t *tun1, *tun2; /* TUN instance for client */ |
| 69 | int tun_fd1 = -1; /* Network file descriptor */ |
| 70 | int tun_fd2 = -1; /* Network file descriptor */ |
| 71 | struct in_addr net, mask; /* Network interface */ |
| 72 | int stattun; /* Allocate static tun */ |
| 73 | |
| 74 | int debug; /* Print debug messages */ |
| 75 | |
| 76 | int encaps_printf(void *p, void *packet, unsigned len) |
| 77 | { |
| 78 | int i; |
| 79 | printf("The packet looks like this:\n"); |
| 80 | for( i=0; i<len; i++) { |
| 81 | printf("%02x ", (unsigned char)*(char *)(packet+i)); |
| 82 | if (!((i+1)%16)) printf("\n"); |
| 83 | }; |
| 84 | printf("\n"); |
| 85 | } |
| 86 | |
| 87 | /* Used to write process ID to file. Assume someone else will delete */ |
| 88 | void log_pid(char *pidfile) { |
| 89 | FILE *file; |
| 90 | mode_t oldmask; |
| 91 | |
| 92 | oldmask = umask(022); |
| 93 | file = fopen(pidfile, "w"); |
| 94 | umask(oldmask); |
| 95 | if(!file) |
| 96 | return; |
| 97 | fprintf(file, "%d\n", getpid()); |
| 98 | fclose(file); |
| 99 | } |
| 100 | |
| 101 | |
| 102 | int create_tun() { |
| 103 | char buf[1024]; |
| 104 | char snet[100], smask[100]; |
| 105 | |
| 106 | if ((tun_fd = tun_newtun((struct tun_t**) &tun)) > maxfd) |
| 107 | maxfd = tun_fd; |
| 108 | |
| 109 | if (tun_fd == -1) { |
| 110 | printf("Failed to open tun\n"); |
| 111 | exit(1); |
| 112 | } |
| 113 | |
| 114 | strncpy(snet, inet_ntoa(net), 100); |
| 115 | strncpy(smask, inet_ntoa(mask), 100); |
| 116 | |
| 117 | sprintf(buf, "ifconfig %s %s mtu 1450 netmask %s", |
| 118 | tun->devname, snet, smask); |
| 119 | if (debug) printf("%s\n", buf); |
| 120 | system(buf); |
| 121 | |
| 122 | system("echo 1 > /proc/sys/net/ipv4/ip_forward"); |
| 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | int getip(struct pdp_t *pdp, void* ipif, struct ul66_t *eua, |
| 128 | struct in_addr *net, struct in_addr *mask) { |
| 129 | struct in_addr addr; |
| 130 | uint32_t ip_start, ip_end, ip_cur; |
| 131 | struct pdp_t *pdp_; |
| 132 | struct ul66_t eua_; |
| 133 | |
| 134 | printf("Begin getip %d %d %2x%2x%2x%2x\n", (unsigned)ipif, eua->l, |
| 135 | eua->v[2],eua->v[3],eua->v[4],eua->v[5]); |
| 136 | |
| 137 | ip_start = ntoh32(net->s_addr & mask->s_addr); |
| 138 | ip_end = ntoh32(hton32(ip_start) | ~mask->s_addr); |
| 139 | |
| 140 | /* By convention the first address is the network address, and the last */ |
| 141 | /* address is the broadcast address. This way two IP addresses are "lost" */ |
| 142 | ip_start++; |
| 143 | |
| 144 | if (eua->l == 0) { /* No address supplied. Find one that is available! */ |
| 145 | /* This routine does linear search. In order to support millions of |
| 146 | * addresses we should instead keep a linked list of available adresses */ |
| 147 | for (ip_cur = ip_start; ip_cur < ip_end; ip_cur++) { |
| 148 | addr.s_addr = hton32(ip_cur); |
| 149 | pdp_ntoeua(&addr, &eua_); |
| 150 | if (pdp_ipget(&pdp_, ipif, &eua_) == -1) { |
| 151 | pdp_ntoeua(&addr, &pdp->eua); |
| 152 | pdp->ipif = ipif; |
| 153 | return 0; |
| 154 | }; |
| 155 | } |
| 156 | return EOF; /* No addresses available */ |
| 157 | } |
| 158 | else { /* Address supplied */ |
| 159 | if (pdp_ipget(&pdp_, ipif, eua) == -1) { |
| 160 | pdp->ipif = ipif; |
| 161 | pdp->eua.l = eua->l; |
| 162 | memcpy(pdp->eua.v, eua->v, eua->l); |
| 163 | return 0; |
| 164 | } |
| 165 | else return EOF; /* Specified address not available */ |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | int delete_context(struct pdp_t *pdp) { |
| 170 | |
| 171 | if (!stattun) { |
| 172 | tun_freetun((struct tun_t*) pdp->ipif); |
| 173 | |
| 174 | /* Clean up locally */ |
| 175 | if (pdp->ipif == tun1) { |
| 176 | printf("Deleting tun interface\n"); |
| 177 | tun_fd1=-1; |
| 178 | } |
| 179 | if (pdp->ipif == tun2) { |
| 180 | printf("Deleting tun interface\n"); |
| 181 | tun_fd2=-1; |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | pdp_ipdel(pdp); |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | int create_pdp_conf(struct pdp_t *pdp, int cause) { |
| 190 | char buf[1024]; |
| 191 | |
| 192 | printf("Received create PDP context response. Cause value: %d\n", cause); |
| 193 | if ((cause == 128) && (pdp->eua.l == 6)) { |
| 194 | |
| 195 | |
| 196 | if (stattun) { |
| 197 | pdp->ipif = tun1; |
| 198 | } |
| 199 | else { |
| 200 | printf("Setting up interface and routing\n"); |
| 201 | if ((tun_fd = tun_newtun((struct tun_t**) &pdp->ipif)) > maxfd) |
| 202 | maxfd = tun_fd; |
| 203 | |
| 204 | /* HACK: Only support select of up to two tun interfaces */ |
| 205 | if (NULL == tun1) { |
| 206 | tun1 = pdp->ipif; |
| 207 | tun_fd1 = tun1->fd; |
| 208 | } |
| 209 | else { |
| 210 | tun2 = pdp->ipif; |
| 211 | tun_fd2 = tun2->fd; |
| 212 | } |
| 213 | |
| 214 | /*system("ifconfig tun0 192.168.0.10");*/ |
| 215 | sprintf(buf, "ifconfig %s %hu.%hu.%hu.%hu", |
| 216 | ((struct tun_t*) pdp->ipif)->devname, |
| 217 | pdp->eua.v[2], pdp->eua.v[3], pdp->eua.v[4], pdp->eua.v[5]); |
| 218 | printf(buf); printf("\n"); |
| 219 | system(buf); |
| 220 | |
| 221 | |
| 222 | /*system("route add -net 192.168.0.0 netmask 255.255.255.0 gw 192.168.0.10");*/ |
| 223 | sprintf(buf, "route add -net %hu.%hu.%hu.0 netmask 255.255.255.0 gw %hu.%hu.%hu.%hu", |
| 224 | pdp->eua.v[2], pdp->eua.v[3], pdp->eua.v[4], |
| 225 | pdp->eua.v[2], pdp->eua.v[3], pdp->eua.v[4], pdp->eua.v[5]); |
| 226 | printf(buf); printf("\n"); |
| 227 | system(buf); |
| 228 | |
| 229 | system("echo 1 > /proc/sys/net/ipv4/ip_forward"); |
| 230 | } |
| 231 | |
| 232 | pdp_ipset(pdp, pdp->ipif, &pdp->eua); |
| 233 | |
| 234 | state = 2; /* Connected */ |
| 235 | } |
| 236 | else { |
| 237 | state = 0; |
| 238 | } |
| 239 | |
| 240 | printf("\n"); |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | |
| 246 | int create_pdp_ind(struct pdp_t *pdp) { |
| 247 | |
| 248 | printf("Received create PDP context request\n"); |
| 249 | |
| 250 | pdp->eua.l=0; /* TODO: Indicates dynamic IP */ |
| 251 | |
| 252 | /* ulcpy(&pdp->qos_neg, &pdp->qos_req, sizeof(pdp->qos_req.v)); */ |
| 253 | memcpy(pdp->qos_neg0, pdp->qos_req0, sizeof(pdp->qos_neg)); |
| 254 | |
| 255 | getip(pdp, &tun, &pdp->eua, &net, &mask); |
| 256 | pdp_ipset(pdp, pdp->ipif, &pdp->eua); |
| 257 | |
| 258 | return 0; /* Success */ |
| 259 | } |
| 260 | |
| 261 | |
| 262 | int delete_pdp_conf(struct pdp_t *pdp, int cause) { |
| 263 | printf("Received delete PDP context response. Cause value: %d\n", cause); |
| 264 | return 0; |
| 265 | } |
| 266 | |
| 267 | int echo_conf(struct pdp_t *pdp, int cause) { |
| 268 | printf("Received echo response. Cause value: %d\n", cause); |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | int conf(int type, int cause, struct pdp_t* pdp, void *aid) { |
| 273 | /* if (cause < 0) return 0; Some error occurred. We don't care */ |
| 274 | switch (type) { |
| 275 | case GTP_ECHO_REQ: |
| 276 | return echo_conf(pdp, cause); |
| 277 | case GTP_CREATE_PDP_REQ: |
| 278 | if (cause !=128) return 0; /* Request not accepted. We don't care */ |
| 279 | return create_pdp_conf(pdp, cause); |
| 280 | case GTP_DELETE_PDP_REQ: |
| 281 | if (cause !=128) return 0; /* Request not accepted. We don't care */ |
| 282 | return delete_pdp_conf(pdp, cause); |
| 283 | default: |
| 284 | return 0; |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | int encaps_gtp_client(void *gsn, struct tun_t *tun, void *pack, unsigned len) { |
| 289 | /* Special client version which checks for source address instead */ |
| 290 | struct pdp_t *pdp; |
| 291 | struct in_addr addr; |
| 292 | struct ul66_t eua; |
| 293 | /*printf("encaps_gtp. Packet received: forwarding to gtp.\n");*/ |
| 294 | /* First we need to extract the IP destination address */ |
| 295 | memcpy(&addr.s_addr, pack+12, 4); /* This ought to be dest addr */ |
| 296 | pdp_ntoeua(&addr, &eua); |
| 297 | if (pdp_ipget(&pdp, tun, &eua) == 0) { |
| 298 | return gtp_gpdu((struct gsn_t*) gsn, pdp, pack, len); |
| 299 | } |
| 300 | else { |
| 301 | printf("Received packet with no destination!!!\n"); |
| 302 | return 0; |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | int encaps_tun(struct pdp_t *pdp, void *pack, unsigned len) { |
| 307 | /* printf("encaps_tun. Packet received: forwarding to tun\n");*/ |
| 308 | return tun_encaps((struct tun_t*) pdp->ipif, pack, len); |
| 309 | } |
| 310 | |
| 311 | int main(int argc, char **argv) |
| 312 | { |
| 313 | /* gengeopt declarations */ |
| 314 | struct gengetopt_args_info args_info; |
| 315 | |
| 316 | /* function-local options */ |
| 317 | |
| 318 | struct hostent *host; |
| 319 | |
| 320 | struct in_addr listen, remote; |
| 321 | struct in_addr dns; |
| 322 | |
| 323 | int gtpfd = -1; /* Network file descriptor */ |
| 324 | struct gsn_t *gsn; /* GSN instance */ |
| 325 | |
| 326 | fd_set fds; /* For select() */ |
| 327 | struct timeval idleTime; /* How long to select() */ |
| 328 | |
| 329 | struct pdp_t *pdp[2]; |
| 330 | |
| 331 | int n; /* For counter */ |
| 332 | |
| 333 | int contexts; /* Number of contexts to create */ |
| 334 | int timelimit; /* Number of seconds to be connected */ |
| 335 | int starttime; /* Time program was started */ |
| 336 | |
| 337 | struct ul_t imsi, qos, apn, msisdn; |
| 338 | unsigned char qosh[3], imsih[8], apnh[256], msisdnh[256]; |
| 339 | struct ul255_t pco; |
| 340 | uint64_t imsi3; |
| 341 | |
| 342 | /* open a connection to the syslog daemon */ |
| 343 | /*openlog(PACKAGE, LOG_PID, LOG_DAEMON);*/ |
| 344 | openlog(PACKAGE, (LOG_PID | LOG_PERROR), LOG_DAEMON); |
| 345 | |
| 346 | if (cmdline_parser (argc, argv, &args_info) != 0) |
| 347 | exit(1); |
| 348 | if (args_info.debug_flag) { |
| 349 | printf("remote: %s\n", args_info.remote_arg); |
| 350 | printf("listen: %s\n", args_info.listen_arg); |
| 351 | printf("conf: %s\n", args_info.conf_arg); |
| 352 | printf("fg: %d\n", args_info.fg_flag); |
| 353 | printf("debug: %d\n", args_info.debug_flag); |
| 354 | printf("imsi: %s\n", args_info.imsi_arg); |
| 355 | printf("qos: %#08x\n", args_info.qos_arg); |
| 356 | printf("apn: %s\n", args_info.apn_arg); |
| 357 | printf("msisdn: %s\n", args_info.msisdn_arg); |
| 358 | printf("uid: %s\n", args_info.uid_arg); |
| 359 | printf("pwd: %s\n", args_info.pwd_arg); |
| 360 | printf("static: %d\n", args_info.static_flag); |
| 361 | printf("net: %s\n", args_info.net_arg); |
| 362 | printf("mask: %s\n", args_info.mask_arg); |
| 363 | printf("pidfile: %s\n", args_info.pidfile_arg); |
| 364 | printf("statedir: %s\n", args_info.statedir_arg); |
| 365 | printf("dns: %s\n", args_info.dns_arg); |
| 366 | printf("contexts: %d\n", args_info.contexts_arg); |
| 367 | printf("timelimit: %d\n", args_info.timelimit_arg); |
| 368 | } |
| 369 | |
| 370 | /* Try out our new parser */ |
| 371 | |
| 372 | if (args_info.conf_arg) { |
| 373 | if (cmdline_parser_configfile (args_info.conf_arg, &args_info, 0) != 0) |
| 374 | exit(1); |
| 375 | if (args_info.debug_flag) { |
| 376 | printf("cmdline_parser_configfile\n"); |
| 377 | printf("remote: %s\n", args_info.remote_arg); |
| 378 | printf("listen: %s\n", args_info.listen_arg); |
| 379 | printf("conf: %s\n", args_info.conf_arg); |
| 380 | printf("fg: %d\n", args_info.fg_flag); |
| 381 | printf("debug: %d\n", args_info.debug_flag); |
| 382 | printf("imsi: %s\n", args_info.imsi_arg); |
| 383 | printf("qos: %#08x\n", args_info.qos_arg); |
| 384 | printf("apn: %s\n", args_info.apn_arg); |
| 385 | printf("msisdn: %s\n", args_info.msisdn_arg); |
| 386 | printf("uid: %s\n", args_info.uid_arg); |
| 387 | printf("pwd: %s\n", args_info.pwd_arg); |
| 388 | printf("static: %d\n", args_info.static_flag); |
| 389 | printf("net: %s\n", args_info.net_arg); |
| 390 | printf("mask: %s\n", args_info.mask_arg); |
| 391 | printf("pidfile: %s\n", args_info.pidfile_arg); |
| 392 | printf("statedir: %s\n", args_info.statedir_arg); |
| 393 | printf("dns: %s\n", args_info.dns_arg); |
| 394 | printf("contexts: %d\n", args_info.contexts_arg); |
| 395 | printf("timelimit: %d\n", args_info.timelimit_arg); |
| 396 | } |
| 397 | } |
| 398 | |
| 399 | /* Handle each option */ |
| 400 | |
| 401 | /* foreground */ |
| 402 | /* If flag not given run as a daemon */ |
| 403 | if (!args_info.fg_flag) |
| 404 | { |
| 405 | closelog(); |
| 406 | /* Close the standard file descriptors. Why? */ |
| 407 | freopen("/dev/null", "w", stdout); |
| 408 | freopen("/dev/null", "w", stderr); |
| 409 | freopen("/dev/null", "r", stdin); |
| 410 | daemon(0, 0); |
| 411 | /* Open log again. This time with new pid */ |
| 412 | openlog(PACKAGE, LOG_PID, LOG_DAEMON); |
| 413 | } |
| 414 | |
| 415 | /* debug */ |
| 416 | debug = args_info.debug_flag; |
| 417 | |
| 418 | /* pidfile */ |
| 419 | /* This has to be done after we have our final pid */ |
| 420 | if (args_info.pidfile_arg) { |
| 421 | log_pid(args_info.pidfile_arg); |
| 422 | } |
| 423 | |
| 424 | /* dns */ |
| 425 | /* If no dns option is given use system default */ |
| 426 | /* Do hostname lookup to translate hostname to IP address */ |
| 427 | printf("\n"); |
| 428 | if (args_info.dns_arg) { |
| 429 | if (!(host = gethostbyname(args_info.dns_arg))) { |
| 430 | fprintf(stderr, "%s: Invalid dns address: %s!\n", |
| 431 | PACKAGE, args_info.dns_arg); |
| 432 | syslog(LOG_ERR, "Invalid dns address: %s!", |
| 433 | args_info.dns_arg); |
| 434 | exit(1); |
| 435 | } |
| 436 | else { |
| 437 | memcpy(&dns.s_addr, host->h_addr, host->h_length); |
| 438 | _res.nscount = 1; |
| 439 | _res.nsaddr_list[0].sin_addr = dns; |
| 440 | printf("Using DNS server: %s (%s)\n", args_info.dns_arg, inet_ntoa(dns)); |
| 441 | } |
| 442 | } |
| 443 | else { |
| 444 | dns.s_addr= 0; |
| 445 | printf("Using default DNS server\n"); |
| 446 | } |
| 447 | |
| 448 | /* listen */ |
| 449 | /* If no listen option is specified listen to any local port */ |
| 450 | /* Do hostname lookup to translate hostname to IP address */ |
| 451 | if (args_info.listen_arg) { |
| 452 | if (!(host = gethostbyname(args_info.listen_arg))) { |
| 453 | fprintf(stderr, "%s: Invalid listening address: %s!\n", |
| 454 | PACKAGE, args_info.listen_arg); |
| 455 | syslog(LOG_ERR, "Invalid listening address: %s!", |
| 456 | args_info.listen_arg); |
| 457 | exit(1); |
| 458 | } |
| 459 | else { |
| 460 | memcpy(&listen.s_addr, host->h_addr, host->h_length); |
| 461 | printf("Local IP address is: %s (%s)\n", args_info.listen_arg, inet_ntoa(listen)); |
| 462 | } |
| 463 | } |
| 464 | else { |
| 465 | fprintf(stderr, "%s: Listening address must be specified: %s!\n", |
| 466 | PACKAGE, args_info.listen_arg); |
| 467 | syslog(LOG_ERR, "Listening address must be specified: %s!", |
| 468 | args_info.listen_arg); |
| 469 | exit(1); |
| 470 | } |
| 471 | |
| 472 | |
| 473 | /* remote */ |
| 474 | /* If no remote option is specified terminate */ |
| 475 | /* Do hostname lookup to translate hostname to IP address */ |
| 476 | if (args_info.remote_arg) { |
| 477 | if (!(host = gethostbyname(args_info.remote_arg))) { |
| 478 | fprintf(stderr, "%s: Invalid remote address: %s!\n", |
| 479 | PACKAGE, args_info.remote_arg); |
| 480 | syslog(LOG_ERR, "Invalid remote address: %s!", |
| 481 | args_info.remote_arg); |
| 482 | exit(1); |
| 483 | } |
| 484 | else { |
| 485 | memcpy(&remote.s_addr, host->h_addr, host->h_length); |
| 486 | printf("Remote IP address is: %s (%s)\n", args_info.remote_arg, inet_ntoa(remote)); |
| 487 | } |
| 488 | } |
| 489 | else { |
| 490 | fprintf(stderr, "%s: No remote address given!\n", |
| 491 | PACKAGE); |
| 492 | syslog(LOG_ERR, "No remote address given!"); |
| 493 | exit(1); |
| 494 | } |
| 495 | |
| 496 | |
| 497 | /* net */ |
| 498 | /* Store net as in_addr */ |
| 499 | if (args_info.net_arg) { |
| 500 | if (!inet_aton(args_info.net_arg, &net)) { |
| 501 | fprintf(stderr, "%s: Invalid network address: %s!\n", |
| 502 | PACKAGE, args_info.net_arg); |
| 503 | syslog(LOG_ERR, "Invalid network address: %s!", |
| 504 | args_info.net_arg); |
| 505 | exit(1); |
| 506 | } |
| 507 | } |
| 508 | |
| 509 | /* mask */ |
| 510 | /* Store mask as in_addr */ |
| 511 | if (args_info.mask_arg) { |
| 512 | if (!inet_aton(args_info.mask_arg, &mask)) { |
| 513 | fprintf(stderr, "%s: Invalid network mask: %s!\n", |
| 514 | PACKAGE, args_info.mask_arg); |
| 515 | syslog(LOG_ERR, "Invalid network mask: %s!", |
| 516 | args_info.mask_arg); |
| 517 | exit(1); |
| 518 | } |
| 519 | } |
| 520 | |
| 521 | /* imsi */ |
| 522 | if (strlen(args_info.imsi_arg)!=15) { |
| 523 | printf("Invalid IMSI\n"); |
| 524 | exit(1); |
| 525 | } |
| 526 | imsi.l = 8; |
| 527 | imsi.v = imsih; |
| 528 | imsi.v[0] = args_info.imsi_arg[0]-48 + (args_info.imsi_arg[1]-48)*16; |
| 529 | imsi.v[1] = args_info.imsi_arg[2]-48 + (args_info.imsi_arg[3]-48)*16; |
| 530 | imsi.v[2] = args_info.imsi_arg[4]-48 + (args_info.imsi_arg[5]-48)*16; |
| 531 | imsi.v[3] = args_info.imsi_arg[6]-48 + (args_info.imsi_arg[7]-48)*16; |
| 532 | imsi.v[4] = args_info.imsi_arg[8]-48 + (args_info.imsi_arg[9]-48)*16; |
| 533 | imsi.v[5] = args_info.imsi_arg[10]-48 + (args_info.imsi_arg[11]-48)*16; |
| 534 | imsi.v[6] = args_info.imsi_arg[12]-48 + (args_info.imsi_arg[13]-48)*16; |
| 535 | imsi.v[7] = args_info.imsi_arg[14]-48 + 0*16; |
| 536 | |
| 537 | if (imsi.l > sizeof(imsi3)) { |
| 538 | printf("Invalid IMSI\n"); |
| 539 | exit(1); |
| 540 | } |
| 541 | else { |
| 542 | memcpy(&imsi3, imsi.v, imsi.l); |
| 543 | printf("IMSI is: %s (%#08llx)\n", args_info.imsi_arg, imsi3); |
| 544 | } |
| 545 | |
| 546 | /* qos */ |
| 547 | qos.l = 3; |
| 548 | qos.v = qosh; |
| 549 | qos.v[2] = (args_info.qos_arg) & 0xff; |
| 550 | qos.v[1] = ((args_info.qos_arg) >> 8) & 0xff; |
| 551 | qos.v[0] = ((args_info.qos_arg) >> 16) & 0xff; |
| 552 | |
| 553 | /* contexts */ |
| 554 | contexts = args_info.contexts_arg; |
| 555 | |
| 556 | /* Timelimit */ |
| 557 | timelimit = args_info.timelimit_arg; |
| 558 | starttime = time(NULL); |
| 559 | |
| 560 | /* apn */ |
| 561 | if (strlen(args_info.apn_arg)>255) { |
| 562 | printf("Invalid APN\n"); |
| 563 | exit(1); |
| 564 | } |
| 565 | apn.l = strlen(args_info.apn_arg) + 1; |
| 566 | apn.v = apnh; |
| 567 | apn.v[0] = (char) strlen(args_info.apn_arg); |
| 568 | strncpy(&apn.v[1], args_info.apn_arg, 255); |
| 569 | printf("Using APN: %s\n", args_info.apn_arg); |
| 570 | |
| 571 | /* msisdn */ |
| 572 | if (strlen(args_info.msisdn_arg)>255) { |
| 573 | printf("Invalid MSISDN\n"); |
| 574 | exit(1); |
| 575 | } |
| 576 | msisdn.l = 1; |
| 577 | msisdn.v = msisdnh; |
| 578 | msisdn.v[0] = 0x91; /* International format */ |
| 579 | for(n=0; n<strlen(args_info.msisdn_arg); n++) { |
| 580 | if ((n%2) == 0) { |
| 581 | msisdn.v[((int)n/2)+1] = args_info.msisdn_arg[n] - 48 + 0xf0; |
| 582 | msisdn.l += 1; |
| 583 | } |
| 584 | else { |
| 585 | msisdn.v[((int)n/2)+1] = (msisdn.v[((int)n/2)+1] & 0x0f) + (args_info.msisdn_arg[n] - 48) * 16; |
| 586 | } |
| 587 | } |
| 588 | printf("Using MSISDN: %s\n", args_info.msisdn_arg); |
| 589 | |
| 590 | /* UID and PWD */ |
| 591 | /* Might need to also insert stuff like DNS etc. */ |
| 592 | if ((strlen(args_info.uid_arg) + strlen(args_info.pwd_arg) + 10)>255) { |
| 593 | printf("invalid UID and PWD\n"); |
| 594 | exit(1); |
| 595 | } |
| 596 | pco.l = strlen(args_info.uid_arg) + strlen(args_info.pwd_arg) + 10; |
| 597 | pco.v[0] = 0x80; /* PPP */ |
| 598 | pco.v[1] = 0xc0; |
| 599 | pco.v[2] = 0x23; /* PAP */ |
| 600 | pco.v[3] = 0x12; |
| 601 | pco.v[4] = 0x01; /* Authenticate request */ |
| 602 | pco.v[5] = 0x01; |
| 603 | pco.v[6] = 0x00; /* MSB of length */ |
| 604 | pco.v[7] = strlen(args_info.uid_arg) + strlen(args_info.pwd_arg) + 6; |
| 605 | pco.v[8] = strlen(args_info.uid_arg); |
| 606 | memcpy(&pco.v[9], args_info.uid_arg, strlen(args_info.uid_arg)); |
| 607 | pco.v[9+strlen(args_info.uid_arg)] = strlen(args_info.pwd_arg); |
| 608 | memcpy(&pco.v[10+strlen(args_info.uid_arg)], args_info.pwd_arg, strlen(args_info.pwd_arg)); |
| 609 | |
| 610 | /* static */ |
| 611 | stattun = args_info.static_flag; |
| 612 | |
| 613 | printf("\nInitialising GTP library\n"); |
| 614 | if ((gtpfd = gtp_new(&gsn, args_info.statedir_arg, &listen)) > maxfd) |
| 615 | maxfd = gtpfd; |
| 616 | |
| 617 | if ((gtpfd = gtp_fd(gsn)) > maxfd) |
| 618 | maxfd = gtpfd; |
| 619 | |
| 620 | gtp_set_cb_gpdu(gsn, encaps_tun); |
| 621 | gtp_set_cb_delete_context(gsn, delete_context); |
| 622 | |
| 623 | gtp_set_cb_conf(gsn, conf); |
| 624 | printf("Done initialising GTP library\n\n"); |
| 625 | |
| 626 | if (stattun) { |
| 627 | create_tun(); |
| 628 | tun1 = tun; |
| 629 | tun_fd1 = tun1->fd; |
| 630 | } |
| 631 | |
| 632 | /* See if anybody is there */ |
| 633 | printf("Sending off echo request\n"); |
| 634 | if (gtpfd != -1) gtp_echo_req(gsn, &remote); /* See if remote is alive ? */ |
| 635 | |
| 636 | for(n=0; n<contexts; n++) { |
| 637 | printf("Setting up PDP context #%d\n", n); |
| 638 | |
| 639 | pdp_newpdp(&pdp[n], imsi3, n, NULL); /* Allocated here. Cleaned up in gtp.c: TODO Should be statically allocated! */ |
| 640 | |
| 641 | /* |
| 642 | if (qos.l > sizeof(pdp[n]->qos_req.v)) { |
| 643 | exit(1); |
| 644 | } |
| 645 | else { |
| 646 | pdp[n]->qos_req.l = qos.l; |
| 647 | memcpy(pdp[n]->qos_req.v, qos.v, qos.l); |
| 648 | } |
| 649 | */ |
| 650 | memcpy(pdp[n]->qos_req0, qos.v, qos.l); /* TODO range check */ |
| 651 | |
| 652 | pdp[n]->selmode = 0x01; /* MS provided APN, subscription not verified */ |
| 653 | |
| 654 | if (apn.l > sizeof(pdp[n]->apn_use.v)) { |
| 655 | exit(1); |
| 656 | } |
| 657 | else { |
| 658 | pdp[n]->apn_use.l = apn.l; |
| 659 | memcpy(pdp[n]->apn_use.v, apn.v, apn.l); |
| 660 | } |
| 661 | |
| 662 | pdp[n]->gsnlc.l = 4; |
| 663 | memcpy(pdp[n]->gsnlc.v, &listen, 4); |
| 664 | pdp[n]->gsnlu.l = 4; |
| 665 | memcpy(pdp[n]->gsnlu.v, &listen, 4); |
| 666 | |
| 667 | if (msisdn.l > sizeof(pdp[n]->msisdn.v)) { |
| 668 | exit(1); |
| 669 | } |
| 670 | else { |
| 671 | pdp[n]->msisdn.l = msisdn.l; |
| 672 | memcpy(pdp[n]->msisdn.v, msisdn.v, msisdn.l); |
| 673 | } |
| 674 | |
| 675 | ipv42eua(&pdp[n]->eua, NULL); /* Request dynamic IP address */ |
| 676 | |
| 677 | if (pco.l > sizeof(pdp[n]->pco_req.v)) { |
| 678 | exit(1); |
| 679 | } |
| 680 | else { |
| 681 | pdp[n]->pco_req.l = pco.l; |
| 682 | memcpy(pdp[n]->pco_req.v, pco.v, pco.l); |
| 683 | } |
| 684 | |
| 685 | /* Create context */ |
| 686 | /* We send this of once. Retransmissions are handled by gtplib */ |
| 687 | if (gtpfd != -1) gtp_create_context(gsn, pdp[n], NULL, &remote); |
| 688 | } |
| 689 | |
| 690 | state = 1; /* Enter wait_connection state */ |
| 691 | |
| 692 | printf("Waiting for response from ggsn........\n\n"); |
| 693 | |
| 694 | |
| 695 | /******************************************************************/ |
| 696 | /* Main select loop */ |
| 697 | /******************************************************************/ |
| 698 | |
| 699 | while (((starttime + timelimit + 10) > time(NULL)) || (0 == timelimit)) { |
| 700 | |
| 701 | /* Take down client connections at some stage */ |
| 702 | if (((starttime + timelimit) <= time(NULL)) && (0 != timelimit) && (2 == state)) { |
| 703 | state = 3; |
| 704 | for(n=0; n<contexts; n++) { |
| 705 | /* Delete context */ |
| 706 | printf("Disconnecting PDP context #%d\n", n); |
| 707 | if (gtpfd != -1) gtp_delete_context(gsn, pdp[n], NULL); |
| 708 | } |
| 709 | } |
| 710 | |
| 711 | FD_ZERO(&fds); |
| 712 | if (tun_fd1 != -1) FD_SET(tun_fd1, &fds); |
| 713 | if (tun_fd2 != -1) FD_SET(tun_fd2, &fds); |
| 714 | if (gtpfd != -1) FD_SET(gtpfd, &fds); |
| 715 | |
| 716 | gtp_retranstimeout(gsn, &idleTime); |
| 717 | |
| 718 | switch (select(maxfd + 1, &fds, NULL, NULL, &idleTime)) { |
| 719 | case -1: |
| 720 | syslog(LOG_ERR, "sgsnemu: select = -1"); |
| 721 | break; |
| 722 | case 0: |
| 723 | gtp_retrans(gsn); /* Only retransmit if nothing else */ |
| 724 | break; |
| 725 | default: |
| 726 | break; |
| 727 | } |
| 728 | |
| 729 | if (tun_fd1 != -1 && |
| 730 | FD_ISSET(tun_fd1, &fds) && |
| 731 | tun_decaps(tun1, encaps_gtp_client, gsn) < 0) { |
| 732 | syslog(LOG_ERR, "TUN read failed (fd)=(%d)", tun_fd1); |
| 733 | } |
| 734 | |
| 735 | if (tun_fd2 != -1 && |
| 736 | FD_ISSET(tun_fd2, &fds) && |
| 737 | tun_decaps(tun2, encaps_gtp_client, gsn) < 0) { |
| 738 | syslog(LOG_ERR, "TUN read failed (fd)=(%d)", tun_fd2); |
| 739 | } |
| 740 | |
| 741 | if (gtpfd != -1 && FD_ISSET(gtpfd, &fds) && |
| 742 | gtp_decaps(gsn) < 0) { |
| 743 | syslog(LOG_ERR, "GTP read failed (gre)=(%d)", gtpfd); |
| 744 | } |
| 745 | |
| 746 | |
| 747 | } |
| 748 | |
| 749 | gtp_free(gsn); /* Clean up the gsn instance */ |
| 750 | |
| 751 | return 1; |
| 752 | |
| 753 | } |
| 754 | |