| File: | src/usr.sbin/npppd/npppd/../pptp/pptp_ctrl.c |
| Warning: | line 1046, column 2 Value stored to 'reason' is never read |
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| 1 | /* $OpenBSD: pptp_ctrl.c,v 1.13 2021/03/29 03:54:40 yasuoka Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2009 Internet Initiative Japan Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 26 | * SUCH DAMAGE. |
| 27 | */ |
| 28 | /**@file |
| 29 | * PPTP(RFC 2637) control connection implementation. |
| 30 | * currently it only support PAC part |
| 31 | */ |
| 32 | /* $Id: pptp_ctrl.c,v 1.13 2021/03/29 03:54:40 yasuoka Exp $ */ |
| 33 | #include <sys/types.h> |
| 34 | #include <sys/socket.h> |
| 35 | #include <netinet/in.h> |
| 36 | #include <stdio.h> |
| 37 | #include <stdarg.h> |
| 38 | #include <stdlib.h> |
| 39 | #include <netdb.h> |
| 40 | #include <unistd.h> |
| 41 | #include <syslog.h> |
| 42 | #include <time.h> |
| 43 | #include <fcntl.h> |
| 44 | #include <errno(*__errno()).h> |
| 45 | #include <string.h> |
| 46 | #include <event.h> |
| 47 | |
| 48 | #include "bytebuf.h" |
| 49 | #include "debugutil.h" |
| 50 | #include "hash.h" |
| 51 | #include "slist.h" |
| 52 | #include "time_utils.h" |
| 53 | |
| 54 | #include "version.h" |
| 55 | |
| 56 | #include "pptp.h" |
| 57 | #include "pptp_local.h" |
| 58 | #include "pptp_subr.h" |
| 59 | |
| 60 | #define MINIMUM(a, b)(((a) < (b)) ? (a) : (b)) (((a) < (b)) ? (a) : (b)) |
| 61 | #define MAXIMUM(a, b)(((a) > (b)) ? (a) : (b)) (((a) > (b)) ? (a) : (b)) |
| 62 | |
| 63 | /* periods of pptp_ctrl_timeout */ |
| 64 | #define PPTP_CTRL_TIMEOUT_IVAL_SEC2 2 |
| 65 | |
| 66 | #ifdef PPTP_CTRL_DEBUG |
| 67 | #define PPTP_CTRL_ASSERT(x) ASSERT(x)((void)0); |
| 68 | #define PPTP_CTRL_DBG(x) pptp_ctrl_log x |
| 69 | #else |
| 70 | #define PPTP_CTRL_ASSERT(x) |
| 71 | #define PPTP_CTRL_DBG(x) |
| 72 | #endif |
| 73 | |
| 74 | static unsigned pptp_ctrl_seqno = 0; |
| 75 | |
| 76 | static void pptp_ctrl_log (pptp_ctrl *, int, const char *, ...) __printflike(3,4)__attribute__((__format__ (__printf__, 3, 4))); |
| 77 | static void pptp_ctrl_timeout (int, short, void *); |
| 78 | static void pptp_ctrl_reset_timeout (pptp_ctrl *); |
| 79 | static void pptp_ctrl_io_event (int, short, void *); |
| 80 | static void pptp_ctrl_set_io_event (pptp_ctrl *); |
| 81 | static int pptp_ctrl_output_flush (pptp_ctrl *); |
| 82 | static void pptp_ctrl_SCCRx_string (struct pptp_scc *, u_char *, int); |
| 83 | static int pptp_ctrl_recv_SCCRQ (pptp_ctrl *, u_char *, int); |
| 84 | static int pptp_ctrl_recv_StopCCRP (pptp_ctrl *, u_char *, int); |
| 85 | static int pptp_ctrl_send_StopCCRQ (pptp_ctrl *, int); |
| 86 | static int pptp_ctrl_recv_StopCCRQ (pptp_ctrl *, u_char *, int); |
| 87 | static int pptp_ctrl_send_StopCCRP (pptp_ctrl *, int, int); |
| 88 | static int pptp_ctrl_send_SCCRP (pptp_ctrl *, int, int); |
| 89 | static void pptp_ctrl_send_CDN (pptp_ctrl *, int, int, int, const char *); |
| 90 | static void pptp_ctrl_process_echo_req (pptp_ctrl *, u_char *, int); |
| 91 | static int pptp_ctrl_recv_echo_rep (pptp_ctrl *, u_char *, int); |
| 92 | static void pptp_ctrl_send_echo_req (pptp_ctrl *); |
| 93 | static int pptp_ctrl_input (pptp_ctrl *, u_char *, int); |
| 94 | static int pptp_ctrl_call_input (pptp_ctrl *, int, u_char *, int); |
| 95 | static const char *pptp_ctrl_state_string (int); |
| 96 | static void pptp_ctrl_fini(pptp_ctrl *); |
| 97 | |
| 98 | /* |
| 99 | * pptp_ctrl instance operation functions |
| 100 | */ |
| 101 | pptp_ctrl * |
| 102 | pptp_ctrl_create(void) |
| 103 | { |
| 104 | pptp_ctrl *_this; |
| 105 | |
| 106 | if ((_this = malloc(sizeof(pptp_ctrl))) == NULL((void *)0)) |
| 107 | return NULL((void *)0); |
| 108 | |
| 109 | return _this; |
| 110 | } |
| 111 | |
| 112 | int |
| 113 | pptp_ctrl_init(pptp_ctrl *_this) |
| 114 | { |
| 115 | time_t curr_time; |
| 116 | |
| 117 | PPTP_CTRL_ASSERT(_this != NULL); |
| 118 | curr_time = get_monosec()((time_t)(get_nanotime() / 1000000000LL)); |
| 119 | memset(_this, 0, sizeof(pptp_ctrl)); |
| 120 | _this->id = pptp_ctrl_seqno++; |
| 121 | _this->sock = -1; |
| 122 | |
| 123 | if ((_this->recv_buf = bytebuffer_create(PPTP_BUFSIZ1024)) == NULL((void *)0)) { |
| 124 | pptp_ctrl_log(_this, LOG_ERR3, "bytebuffer_create() failed at " |
| 125 | "%s(): %m", __func__); |
| 126 | goto fail; |
| 127 | } |
| 128 | if ((_this->send_buf = bytebuffer_create(PPTP_BUFSIZ1024)) == NULL((void *)0)) { |
| 129 | pptp_ctrl_log(_this, LOG_ERR3, "bytebuffer_create() failed at " |
| 130 | "%s(): %m", __func__); |
| 131 | goto fail; |
| 132 | } |
| 133 | _this->last_rcv_ctrl = curr_time; |
| 134 | _this->last_snd_ctrl = curr_time; |
| 135 | _this->echo_seq = arc4random(); |
| 136 | _this->echo_interval = PPTP_CTRL_DEFAULT_ECHO_INTERVAL60; |
| 137 | _this->echo_timeout = PPTP_CTRL_DEFAULT_ECHO_TIMEOUT60; |
| 138 | slist_init(&_this->call_list); |
| 139 | evtimer_set(&_this->ev_timer, pptp_ctrl_timeout, _this)event_set(&_this->ev_timer, -1, 0, pptp_ctrl_timeout, _this ); |
| 140 | |
| 141 | return 0; |
| 142 | fail: |
| 143 | return 1; |
| 144 | } |
| 145 | |
| 146 | int |
| 147 | pptp_ctrl_start(pptp_ctrl *_this) |
| 148 | { |
| 149 | int ival; |
| 150 | char hbuf0[NI_MAXHOST256], sbuf0[NI_MAXSERV32]; |
| 151 | char hbuf1[NI_MAXHOST256], sbuf1[NI_MAXSERV32]; |
| 152 | struct sockaddr_storage sock; |
| 153 | socklen_t socklen; |
| 154 | |
| 155 | PPTP_CTRL_ASSERT(_this != NULL); |
| 156 | PPTP_CTRL_ASSERT(_this->sock >= 0); |
| 157 | |
| 158 | /* convert address to strings for logging */ |
| 159 | strlcpy(hbuf0, "<unknown>", sizeof(hbuf0)); |
| 160 | strlcpy(sbuf0, "<unknown>", sizeof(sbuf0)); |
| 161 | strlcpy(hbuf1, "<unknown>", sizeof(hbuf1)); |
| 162 | strlcpy(sbuf1, "<unknown>", sizeof(sbuf1)); |
| 163 | if (getnameinfo((struct sockaddr *)&_this->peer, _this->peer.ss_len, |
| 164 | hbuf0, sizeof(hbuf0), sbuf0, sizeof(sbuf0), |
| 165 | NI_NUMERICHOST1 | NI_NUMERICSERV2) != 0) { |
| 166 | pptp_ctrl_log(_this, LOG_ERR3, |
| 167 | "getnameinfo() failed at %s(): %m", __func__); |
| 168 | } |
| 169 | socklen = sizeof(sock); |
| 170 | if (getsockname(_this->sock, (struct sockaddr *)&sock, &socklen) != 0) { |
| 171 | pptp_ctrl_log(_this, LOG_ERR3, |
| 172 | "getsockname() failed at %s(): %m", __func__); |
| 173 | goto fail; |
| 174 | } |
| 175 | if (getnameinfo((struct sockaddr *)&sock, sock.ss_len, hbuf1, |
| 176 | sizeof(hbuf1), sbuf1, sizeof(sbuf1), |
| 177 | NI_NUMERICHOST1 | NI_NUMERICSERV2) != 0) { |
| 178 | pptp_ctrl_log(_this, LOG_ERR3, |
| 179 | "getnameinfo() failed at %s(): %m", __func__); |
| 180 | } |
| 181 | pptp_ctrl_log(_this, LOG_INFO6, "Starting peer=%s:%s/tcp " |
| 182 | "sock=%s:%s/tcp", hbuf0, sbuf0, hbuf1, sbuf1); |
| 183 | |
| 184 | if ((ival = fcntl(_this->sock, F_GETFL3)) < 0) { |
| 185 | pptp_ctrl_log(_this, LOG_ERR3, |
| 186 | "fcntl(F_GET_FL) failed at %s(): %m", __func__); |
| 187 | goto fail; |
| 188 | } else if (fcntl(_this->sock, F_SETFL4, ival | O_NONBLOCK0x0004) < 0) { |
| 189 | pptp_ctrl_log(_this, LOG_ERR3, |
| 190 | "fcntl(F_SET_FL) failed at %s(): %m", __func__); |
| 191 | goto fail; |
| 192 | } |
| 193 | pptp_ctrl_set_io_event(_this); |
| 194 | pptp_ctrl_reset_timeout(_this); |
| 195 | |
| 196 | return 0; |
| 197 | fail: |
| 198 | return 1; |
| 199 | } |
| 200 | |
| 201 | /* Timer */ |
| 202 | static void |
| 203 | pptp_ctrl_timeout(int fd, short event, void *ctx) |
| 204 | { |
| 205 | int i; |
| 206 | pptp_call *call; |
| 207 | pptp_ctrl *_this; |
| 208 | time_t last, curr_time; |
| 209 | |
| 210 | _this = ctx; |
| 211 | curr_time = get_monosec()((time_t)(get_nanotime() / 1000000000LL)); |
| 212 | |
| 213 | PPTP_CTRL_DBG((_this, DEBUG_LEVEL_3, "enter %s()", __func__)); |
| 214 | /* clean up call */ |
| 215 | i = 0; |
| 216 | while (i < slist_length(&_this->call_list)) { |
| 217 | call = slist_get(&_this->call_list, i); |
| 218 | if (call->state == PPTP_CALL_STATE_CLEANUP_WAIT3 && |
| 219 | curr_time - call->last_io > PPTP_CALL_CLEANUP_WAIT_TIME3) { |
| 220 | pptp_call_stop(call); |
| 221 | pptp_call_destroy(call); |
| 222 | slist_remove(&_this->call_list, i); |
| 223 | } else |
| 224 | i++; |
| 225 | } |
| 226 | |
| 227 | /* State machine: Timeout */ |
| 228 | switch (_this->state) { |
| 229 | default: |
| 230 | case PPTP_CTRL_STATE_WAIT_CTRL_REPLY1: |
| 231 | case PPTP_CTRL_STATE_IDLE0: |
| 232 | if (curr_time - _this->last_rcv_ctrl > PPTPD_IDLE_TIMEOUT60) { |
| 233 | pptp_ctrl_log(_this, LOG_ERR3, |
| 234 | "Timeout in state %s", |
| 235 | pptp_ctrl_state_string(_this->state)); |
| 236 | pptp_ctrl_fini(_this); |
| 237 | return; |
| 238 | } |
| 239 | break; |
| 240 | case PPTP_CTRL_STATE_ESTABLISHED2: |
| 241 | last = MAXIMUM(_this->last_rcv_ctrl, _this->last_snd_ctrl)(((_this->last_rcv_ctrl) > (_this->last_snd_ctrl)) ? (_this->last_rcv_ctrl) : (_this->last_snd_ctrl)); |
| 242 | |
| 243 | if (curr_time - _this->last_rcv_ctrl |
| 244 | >= _this->echo_interval + _this->echo_timeout) { |
| 245 | pptp_ctrl_log(_this, LOG_INFO6, |
| 246 | "Timeout waiting for echo reply"); |
| 247 | pptp_ctrl_fini(_this); |
| 248 | return; |
| 249 | } |
| 250 | if (curr_time - last >= _this->echo_interval) { |
| 251 | PPTP_CTRL_DBG((_this, LOG_DEBUG, "Echo")); |
| 252 | _this->echo_seq++; |
| 253 | pptp_ctrl_send_echo_req(_this); |
| 254 | } |
| 255 | break; |
| 256 | case PPTP_CTRL_STATE_WAIT_STOP_REPLY3: |
| 257 | if (curr_time - _this->last_snd_ctrl > |
| 258 | PPTP_CTRL_StopCCRP_WAIT_TIME3) { |
| 259 | pptp_ctrl_log(_this, LOG_WARNING4, |
| 260 | "Timeout waiting for StopCCRP"); |
| 261 | pptp_ctrl_fini(_this); |
| 262 | return; |
| 263 | } |
| 264 | break; |
| 265 | case PPTP_CTRL_STATE_DISPOSING4: |
| 266 | pptp_ctrl_fini(_this); |
| 267 | return; |
| 268 | } |
| 269 | pptp_ctrl_reset_timeout(_this); |
| 270 | } |
| 271 | |
| 272 | static void |
| 273 | pptp_ctrl_reset_timeout(pptp_ctrl *_this) |
| 274 | { |
| 275 | struct timeval tv; |
| 276 | |
| 277 | switch (_this->state) { |
| 278 | case PPTP_CTRL_STATE_DISPOSING4: |
| 279 | /* call back immediately */ |
| 280 | timerclear(&tv)(&tv)->tv_sec = (&tv)->tv_usec = 0; |
| 281 | break; |
| 282 | default: |
| 283 | tv.tv_sec = PPTP_CTRL_TIMEOUT_IVAL_SEC2; |
| 284 | tv.tv_usec = 0; |
| 285 | break; |
| 286 | } |
| 287 | evtimer_add(&_this->ev_timer, &tv)event_add(&_this->ev_timer, &tv); |
| 288 | } |
| 289 | |
| 290 | /** |
| 291 | * Terminate PPTP control connection |
| 292 | * @result The value for Stop-Control-Connection-Request(StopCCRQ) result. |
| 293 | This function will not sent StopCCRQ when the value == 0 and |
| 294 | the specification does not require to sent it. |
| 295 | * @see ::#PPTP_StopCCRQ_REASON_STOP_PROTOCOL |
| 296 | * @see ::#PPTP_StopCCRQ_REASON_STOP_LOCAL_SHUTDOWN |
| 297 | */ |
| 298 | void |
| 299 | pptp_ctrl_stop(pptp_ctrl *_this, int result) |
| 300 | { |
| 301 | int i; |
| 302 | pptp_call *call; |
| 303 | |
| 304 | switch (_this->state) { |
| 305 | case PPTP_CTRL_STATE_WAIT_STOP_REPLY3: |
| 306 | /* waiting response. */ |
| 307 | /* this state will timeout by pptp_ctrl_timeout */ |
| 308 | break; |
| 309 | case PPTP_CTRL_STATE_ESTABLISHED2: |
| 310 | if (result != 0) { |
| 311 | for (i = 0; i < slist_length(&_this->call_list); i++) { |
| 312 | call = slist_get(&_this->call_list, i); |
| 313 | pptp_call_disconnect(call, |
| 314 | PPTP_CDN_RESULT_ADMIN_SHUTDOWN3, 0, NULL((void *)0)); |
| 315 | } |
| 316 | pptp_ctrl_send_StopCCRQ(_this, result); |
| 317 | _this->state = PPTP_CTRL_STATE_WAIT_STOP_REPLY3; |
| 318 | break; |
| 319 | } |
| 320 | /* FALLTHROUGH */ |
| 321 | default: |
| 322 | pptp_ctrl_fini(_this); |
| 323 | } |
| 324 | return; |
| 325 | } |
| 326 | |
| 327 | |
| 328 | /* finish PPTP control */ |
| 329 | static void |
| 330 | pptp_ctrl_fini(pptp_ctrl *_this) |
| 331 | { |
| 332 | pptp_call *call; |
| 333 | |
| 334 | PPTP_CTRL_ASSERT(_this != NULL); |
| 335 | |
| 336 | if (_this->sock >= 0) { |
| 337 | event_del(&_this->ev_sock); |
| 338 | close(_this->sock); |
| 339 | _this->sock = -1; |
| 340 | } |
| 341 | for (slist_itr_first(&_this->call_list); |
| 342 | slist_itr_has_next(&_this->call_list);) { |
| 343 | call = slist_itr_next(&_this->call_list); |
| 344 | pptp_call_stop(call); |
| 345 | pptp_call_destroy(call); |
| 346 | slist_itr_remove(&_this->call_list); |
| 347 | } |
| 348 | |
| 349 | if (_this->on_io_event != 0) { |
| 350 | /* |
| 351 | * as the complete terminate process needs complicated |
| 352 | * exception handling, do partially at here. |
| 353 | * rest of part will be handled by timer-event-handler. |
| 354 | */ |
| 355 | PPTP_CTRL_DBG((_this, LOG_DEBUG, "Disposing")); |
| 356 | _this->state = PPTP_CTRL_STATE_DISPOSING4; |
| 357 | pptp_ctrl_reset_timeout(_this); |
| 358 | return; |
| 359 | } |
| 360 | |
| 361 | evtimer_del(&_this->ev_timer)event_del(&_this->ev_timer); |
| 362 | slist_fini(&_this->call_list); |
| 363 | |
| 364 | pptp_ctrl_log (_this, LOG_NOTICE5, "logtype=Finished"); |
| 365 | |
| 366 | /* disable _this */ |
| 367 | pptpd_ctrl_finished_notify(_this->pptpd, _this); |
| 368 | } |
| 369 | |
| 370 | /* free PPTP control context */ |
| 371 | void |
| 372 | pptp_ctrl_destroy(pptp_ctrl *_this) |
| 373 | { |
| 374 | if (_this->send_buf != NULL((void *)0)) { |
| 375 | bytebuffer_destroy(_this->send_buf); |
| 376 | _this->send_buf = NULL((void *)0); |
| 377 | } |
| 378 | if (_this->recv_buf != NULL((void *)0)) { |
| 379 | bytebuffer_destroy(_this->recv_buf); |
| 380 | _this->recv_buf = NULL((void *)0); |
| 381 | } |
| 382 | free(_this); |
| 383 | } |
| 384 | |
| 385 | /* |
| 386 | * network I/O |
| 387 | */ |
| 388 | /* I/O event dispather */ |
| 389 | static void |
| 390 | pptp_ctrl_io_event(int fd, short evmask, void *ctx) |
| 391 | { |
| 392 | int sz, lpkt, hdrlen; |
| 393 | u_char *pkt; |
| 394 | pptp_ctrl *_this; |
| 395 | |
| 396 | _this = ctx; |
| 397 | PPTP_CTRL_ASSERT(_this != NULL); |
| 398 | |
| 399 | _this->on_io_event = 1; |
| 400 | if ((evmask & EV_WRITE0x04) != 0) { |
| 401 | if (pptp_ctrl_output_flush(_this) != 0 || |
| 402 | _this->state == PPTP_CTRL_STATE_DISPOSING4) |
| 403 | goto fail; |
| 404 | _this->send_ready = 1; |
| 405 | } |
| 406 | if ((evmask & EV_READ0x02) != 0) { |
| 407 | sz = read(_this->sock, bytebuffer_pointer(_this->recv_buf), |
| 408 | bytebuffer_remaining(_this->recv_buf)); |
| 409 | if (sz <= 0) { |
| 410 | if (sz == 0 || errno(*__errno()) == ECONNRESET54) { |
| 411 | pptp_ctrl_log(_this, LOG_INFO6, |
| 412 | "Connection closed by foreign host"); |
| 413 | pptp_ctrl_fini(_this); |
| 414 | goto fail; |
| 415 | } else if (errno(*__errno()) != EAGAIN35 && errno(*__errno()) != EINTR4) { |
| 416 | pptp_ctrl_log(_this, LOG_INFO6, |
| 417 | "read() failed at %s(): %m", __func__); |
| 418 | pptp_ctrl_fini(_this); |
| 419 | goto fail; |
| 420 | } |
| 421 | } |
| 422 | bytebuffer_put(_this->recv_buf, BYTEBUFFER_PUT_DIRECT, sz); |
| 423 | bytebuffer_flip(_this->recv_buf); |
| 424 | |
| 425 | for (;;) { |
| 426 | pkt = bytebuffer_pointer(_this->recv_buf); |
| 427 | lpkt = bytebuffer_remaining(_this->recv_buf); |
| 428 | if (pkt == NULL((void *)0) || |
| 429 | lpkt < sizeof(struct pptp_ctrl_header)) |
| 430 | break; /* read again */ |
| 431 | |
| 432 | hdrlen = pkt[0] << 8 | pkt[1]; |
| 433 | if (lpkt < hdrlen) |
| 434 | break; /* read again */ |
| 435 | |
| 436 | bytebuffer_get(_this->recv_buf, NULL((void *)0), hdrlen); |
| 437 | if (pptp_ctrl_input(_this, pkt, hdrlen) != 0 || |
| 438 | _this->state == PPTP_CTRL_STATE_DISPOSING4) { |
| 439 | bytebuffer_compact(_this->recv_buf); |
| 440 | goto fail; |
| 441 | } |
| 442 | } |
| 443 | bytebuffer_compact(_this->recv_buf); |
| 444 | } |
| 445 | if (pptp_ctrl_output_flush(_this) != 0) |
| 446 | goto fail; |
| 447 | pptp_ctrl_set_io_event(_this); |
| 448 | fail: |
| 449 | _this->on_io_event = 0; |
| 450 | } |
| 451 | |
| 452 | |
| 453 | /* set i/o event mask */ |
| 454 | static void |
| 455 | pptp_ctrl_set_io_event(pptp_ctrl *_this) |
| 456 | { |
| 457 | int evmask; |
| 458 | |
| 459 | PPTP_CTRL_ASSERT(_this != NULL); |
| 460 | PPTP_CTRL_ASSERT(_this->sock >= 0); |
| 461 | |
| 462 | evmask = 0; |
| 463 | if (bytebuffer_remaining(_this->recv_buf) > 128) |
| 464 | evmask |= EV_READ0x02; |
| 465 | if (_this->send_ready == 0) |
| 466 | evmask |= EV_WRITE0x04; |
| 467 | |
| 468 | event_del(&_this->ev_sock); |
| 469 | if (evmask != 0) { |
| 470 | event_set(&_this->ev_sock, _this->sock, evmask, |
| 471 | pptp_ctrl_io_event, _this); |
| 472 | event_add(&_this->ev_sock, NULL((void *)0)); |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | /** |
| 477 | * Output PPTP control packet |
| 478 | * @param pkt pointer to packet buffer. |
| 479 | * when it was appended by _this-.send_buf using bytebuffer, |
| 480 | * specify NULL. |
| 481 | * @param lpkt packet length |
| 482 | */ |
| 483 | void |
| 484 | pptp_ctrl_output(pptp_ctrl *_this, u_char *pkt, int lpkt) |
| 485 | { |
| 486 | PPTP_CTRL_ASSERT(_this != NULL); |
| 487 | PPTP_CTRL_ASSERT(lpkt > 0); |
| 488 | |
| 489 | /* just put the packet into the buffer now. send it later */ |
| 490 | bytebuffer_put(_this->send_buf, pkt, lpkt); |
| 491 | |
| 492 | if (_this->on_io_event != 0) { |
| 493 | /* |
| 494 | * pptp_ctrl_output_flush() will be called by the end of |
| 495 | * the I/O event handler. |
| 496 | */ |
| 497 | } else { |
| 498 | /* |
| 499 | * When this function is called by other than I/O event handler, |
| 500 | * we need to call pptp_ctrl_output_flush(). However if we do |
| 501 | * it here, then we need to consider the situation |
| 502 | * 'flush => write failure => finalize'. The situation requires |
| 503 | * the caller function to handle the exception and causes |
| 504 | * complication. So we call pptp_ctrl_output_flush() by the |
| 505 | * the next send ready event. |
| 506 | */ |
| 507 | _this->send_ready = 0; /* clear 'send ready' */ |
| 508 | pptp_ctrl_set_io_event(_this); /* wait 'send ready */ |
| 509 | } |
| 510 | |
| 511 | return; |
| 512 | } |
| 513 | |
| 514 | /* Send Stop-Control-Connection-Request */ |
| 515 | |
| 516 | /* flush output packet */ |
| 517 | static int |
| 518 | pptp_ctrl_output_flush(pptp_ctrl *_this) |
| 519 | { |
| 520 | int sz; |
| 521 | time_t curr_time; |
| 522 | |
| 523 | curr_time = get_monosec()((time_t)(get_nanotime() / 1000000000LL)); |
| 524 | |
| 525 | if (bytebuffer_position(_this->send_buf) <= 0) |
| 526 | return 0; /* nothing to write */ |
| 527 | if (_this->send_ready == 0) { |
| 528 | pptp_ctrl_set_io_event(_this); |
| 529 | return 0; /* not ready to write */ |
| 530 | } |
| 531 | |
| 532 | bytebuffer_flip(_this->send_buf); |
| 533 | |
| 534 | if (PPTP_CTRL_CONF(_this)((pptpd_listener *)slist_get(&(_this)->pptpd->listener , (_this)->listener_index))->conf->ctrl_out_pktdump != 0) { |
| 535 | pptp_ctrl_log(_this, LOG_DEBUG7, "PPTP Control output packet"); |
| 536 | show_hd(debug_get_debugfp(), |
| 537 | bytebuffer_pointer(_this->send_buf), |
| 538 | bytebuffer_remaining(_this->send_buf)); |
| 539 | } |
| 540 | if ((sz = write(_this->sock, bytebuffer_pointer(_this->send_buf), |
| 541 | bytebuffer_remaining(_this->send_buf))) < 0) { |
| 542 | pptp_ctrl_log(_this, LOG_ERR3, "write to socket failed: %m"); |
| 543 | pptp_ctrl_fini(_this); |
| 544 | |
| 545 | return 1; |
| 546 | } |
| 547 | _this->last_snd_ctrl = curr_time; |
| 548 | bytebuffer_get(_this->send_buf, NULL((void *)0), sz); |
| 549 | bytebuffer_compact(_this->send_buf); |
| 550 | _this->send_ready = 0; |
| 551 | |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | /* convert Start-Control-Connection-{Request,Reply} packet to strings */ |
| 556 | static void |
| 557 | pptp_ctrl_SCCRx_string(struct pptp_scc *scc, u_char *buf, int lbuf) |
| 558 | { |
| 559 | char results[128]; |
| 560 | |
| 561 | if (scc->result_code != 0) |
| 562 | snprintf(results, sizeof(results), "result=%d error=%d ", |
| 563 | scc->result_code, scc->error_code); |
| 564 | else |
| 565 | results[0] = '\0'; |
| 566 | |
| 567 | snprintf(buf, lbuf, |
| 568 | "protocol_version=%d.%d %sframing=%s bearer=%s max_channels=%d " |
| 569 | "firmware_revision=%d(0x%04x) host_name=\"%.*s\" " |
| 570 | "vendor_string=\"%.*s\"", |
| 571 | scc->protocol_version >> 8, scc->protocol_version & 0xff, results, |
| 572 | pptp_framing_string(scc->framing_caps), |
| 573 | pptp_bearer_string(scc->bearer_caps), scc->max_channels, |
| 574 | scc->firmware_revision, scc->firmware_revision, |
| 575 | (u_int)sizeof(scc->host_name), scc->host_name, |
| 576 | (u_int)sizeof(scc->vendor_string), scc->vendor_string); |
| 577 | } |
| 578 | |
| 579 | /* receive Start-Control-Connection-Request */ |
| 580 | static int |
| 581 | pptp_ctrl_recv_SCCRQ(pptp_ctrl *_this, u_char *pkt, int lpkt) |
| 582 | { |
| 583 | char logbuf[512]; |
| 584 | struct pptp_scc *scc; |
| 585 | |
| 586 | /* sanity check */ |
| 587 | if (lpkt < sizeof(struct pptp_scc)) { |
| 588 | pptp_ctrl_log(_this, LOG_ERR3, "Received bad SCCRQ: packet too " |
| 589 | "short: %d < %d", lpkt, (int)sizeof(struct pptp_scc)); |
| 590 | return 1; |
| 591 | } |
| 592 | scc = (struct pptp_scc *)pkt; |
| 593 | |
| 594 | scc->protocol_version = ntohs(scc->protocol_version)(__uint16_t)(__builtin_constant_p(scc->protocol_version) ? (__uint16_t)(((__uint16_t)(scc->protocol_version) & 0xffU ) << 8 | ((__uint16_t)(scc->protocol_version) & 0xff00U ) >> 8) : __swap16md(scc->protocol_version)); |
| 595 | scc->framing_caps = htonl(scc->framing_caps)(__uint32_t)(__builtin_constant_p(scc->framing_caps) ? (__uint32_t )(((__uint32_t)(scc->framing_caps) & 0xff) << 24 | ((__uint32_t)(scc->framing_caps) & 0xff00) << 8 | ((__uint32_t)(scc->framing_caps) & 0xff0000) >> 8 | ((__uint32_t)(scc->framing_caps) & 0xff000000) >> 24) : __swap32md(scc->framing_caps)); |
| 596 | scc->bearer_caps = htonl(scc->bearer_caps)(__uint32_t)(__builtin_constant_p(scc->bearer_caps) ? (__uint32_t )(((__uint32_t)(scc->bearer_caps) & 0xff) << 24 | ((__uint32_t)(scc->bearer_caps) & 0xff00) << 8 | ((__uint32_t)(scc->bearer_caps) & 0xff0000) >> 8 | ((__uint32_t)(scc->bearer_caps) & 0xff000000) >> 24) : __swap32md(scc->bearer_caps)); |
| 597 | scc->max_channels = htons(scc->max_channels)(__uint16_t)(__builtin_constant_p(scc->max_channels) ? (__uint16_t )(((__uint16_t)(scc->max_channels) & 0xffU) << 8 | ((__uint16_t)(scc->max_channels) & 0xff00U) >> 8) : __swap16md(scc->max_channels)); |
| 598 | scc->firmware_revision = htons(scc->firmware_revision)(__uint16_t)(__builtin_constant_p(scc->firmware_revision) ? (__uint16_t)(((__uint16_t)(scc->firmware_revision) & 0xffU ) << 8 | ((__uint16_t)(scc->firmware_revision) & 0xff00U) >> 8) : __swap16md(scc->firmware_revision) ); |
| 599 | |
| 600 | /* check protocol version */ |
| 601 | if (scc->protocol_version != PPTP_RFC_2637_VERSION0x0100) { |
| 602 | pptp_ctrl_log(_this, LOG_ERR3, "Received bad SCCRQ: " |
| 603 | "unknown protocol version %d", scc->protocol_version); |
| 604 | return 1; |
| 605 | } |
| 606 | |
| 607 | pptp_ctrl_SCCRx_string(scc, logbuf, sizeof(logbuf)); |
| 608 | pptp_ctrl_log(_this, LOG_INFO6, "RecvSCCRQ %s", logbuf); |
| 609 | |
| 610 | return 0; |
| 611 | } |
| 612 | |
| 613 | /* Receive Stop-Control-Connection-Reply */ |
| 614 | static int |
| 615 | pptp_ctrl_recv_StopCCRP(pptp_ctrl *_this, u_char *pkt, int lpkt) |
| 616 | { |
| 617 | struct pptp_stop_ccrp *stop_ccrp; |
| 618 | |
| 619 | if (lpkt < sizeof(struct pptp_stop_ccrp)) { |
| 620 | pptp_ctrl_log(_this, LOG_ERR3, "Received bad StopCCRP: packet " |
| 621 | "too short: %d < %d", lpkt, |
| 622 | (int)sizeof(struct pptp_stop_ccrp)); |
| 623 | return 1; |
| 624 | } |
| 625 | stop_ccrp = (struct pptp_stop_ccrp *)pkt; |
| 626 | |
| 627 | pptp_ctrl_log(_this, LOG_INFO6, "RecvStopCCRP reason=%s(%u)", |
| 628 | pptp_StopCCRP_result_string(stop_ccrp->result), stop_ccrp->result); |
| 629 | |
| 630 | return 0; |
| 631 | } |
| 632 | |
| 633 | static int |
| 634 | pptp_ctrl_send_StopCCRQ(pptp_ctrl *_this, int reason) |
| 635 | { |
| 636 | int lpkt; |
| 637 | struct pptp_stop_ccrq *stop_ccrq; |
| 638 | |
| 639 | stop_ccrq = bytebuffer_pointer(_this->send_buf); |
| 640 | lpkt = bytebuffer_remaining(_this->send_buf); |
| 641 | if (lpkt < sizeof(struct pptp_stop_ccrq)) { |
| 642 | pptp_ctrl_log(_this, LOG_ERR3, |
| 643 | "SendCCRP failed: No buffer space available"); |
| 644 | return -1; |
| 645 | } |
| 646 | memset(stop_ccrq, 0, sizeof(struct pptp_stop_ccrq)); |
| 647 | |
| 648 | pptp_init_header(&stop_ccrq->header, sizeof(struct pptp_stop_ccrq), |
| 649 | PPTP_CTRL_MES_CODE_StopCCRQ3); |
| 650 | |
| 651 | stop_ccrq->reason = reason; |
| 652 | |
| 653 | pptp_ctrl_log(_this, LOG_INFO6, "SendStopCCRQ reason=%s(%u)", |
| 654 | pptp_StopCCRQ_reason_string(stop_ccrq->reason), stop_ccrq->reason); |
| 655 | |
| 656 | pptp_ctrl_output(_this, NULL((void *)0), sizeof(struct pptp_stop_ccrq)); |
| 657 | |
| 658 | return 0; |
| 659 | } |
| 660 | |
| 661 | /* Receive Stop-Control-Connection-Request */ |
| 662 | static int |
| 663 | pptp_ctrl_recv_StopCCRQ(pptp_ctrl *_this, u_char *pkt, int lpkt) |
| 664 | { |
| 665 | struct pptp_stop_ccrq *stop_ccrq; |
| 666 | |
| 667 | if (lpkt < sizeof(struct pptp_stop_ccrq)) { |
| 668 | pptp_ctrl_log(_this, LOG_ERR3, "Received bad StopCCRQ: packet " |
| 669 | "too short: %d < %d", lpkt, |
| 670 | (int)sizeof(struct pptp_stop_ccrq)); |
| 671 | return 1; |
| 672 | } |
| 673 | stop_ccrq = (struct pptp_stop_ccrq *)pkt; |
| 674 | |
| 675 | pptp_ctrl_log(_this, LOG_INFO6, "RecvStopCCRQ reason=%s(%u)", |
| 676 | pptp_StopCCRQ_reason_string(stop_ccrq->reason), stop_ccrq->reason); |
| 677 | |
| 678 | return 0; |
| 679 | } |
| 680 | |
| 681 | /* Send Stop-Control-Connection-Reply */ |
| 682 | static int |
| 683 | pptp_ctrl_send_StopCCRP(pptp_ctrl *_this, int result, int error) |
| 684 | { |
| 685 | int lpkt; |
| 686 | struct pptp_stop_ccrp *stop_ccrp; |
| 687 | |
| 688 | stop_ccrp = bytebuffer_pointer(_this->send_buf); |
| 689 | |
| 690 | lpkt = bytebuffer_remaining(_this->send_buf); |
| 691 | if (lpkt < sizeof(struct pptp_stop_ccrp)) { |
| 692 | pptp_ctrl_log(_this, LOG_ERR3, |
| 693 | "SendCCRQ failed: No buffer space available"); |
| 694 | return -1; |
| 695 | } |
| 696 | memset(stop_ccrp, 0, sizeof(struct pptp_stop_ccrp)); |
| 697 | |
| 698 | pptp_init_header(&stop_ccrp->header, sizeof(struct pptp_stop_ccrp), |
| 699 | PPTP_CTRL_MES_CODE_StopCCRP4); |
| 700 | |
| 701 | stop_ccrp->result = result; |
| 702 | stop_ccrp->error = error; |
| 703 | |
| 704 | pptp_ctrl_log(_this, LOG_INFO6, |
| 705 | "SendStopCCRP result=%s(%u) error=%s(%u)", |
| 706 | pptp_StopCCRP_result_string(stop_ccrp->result), stop_ccrp->result, |
| 707 | pptp_general_error_string(stop_ccrp->error), stop_ccrp->error); |
| 708 | |
| 709 | pptp_ctrl_output(_this, NULL((void *)0), sizeof(struct pptp_stop_ccrp)); |
| 710 | |
| 711 | return 0; |
| 712 | } |
| 713 | |
| 714 | /* Send Start-Control-Connection-Reply */ |
| 715 | static int |
| 716 | pptp_ctrl_send_SCCRP(pptp_ctrl *_this, int result, int error) |
| 717 | { |
| 718 | int lpkt; |
| 719 | struct pptp_scc *scc; |
| 720 | char logbuf[512]; |
| 721 | const char *val; |
| 722 | |
| 723 | scc = bytebuffer_pointer(_this->send_buf); |
| 724 | lpkt = bytebuffer_remaining(_this->send_buf); |
| 725 | if (lpkt < sizeof(struct pptp_scc)) { |
| 726 | pptp_ctrl_log(_this, LOG_ERR3, |
| 727 | "SendSCCRP failed: No buffer space available"); |
| 728 | return -1; |
| 729 | } |
| 730 | memset(scc, 0, sizeof(struct pptp_scc)); |
| 731 | |
| 732 | pptp_init_header(&scc->header, sizeof(struct pptp_scc), |
| 733 | PPTP_CTRL_MES_CODE_SCCRP2); |
| 734 | |
| 735 | scc->protocol_version = PPTP_RFC_2637_VERSION0x0100; |
| 736 | scc->result_code = result; |
| 737 | scc->error_code = error; |
| 738 | |
| 739 | /* XXX only support sync frames */ |
| 740 | scc->framing_caps = PPTP_CTRL_FRAMING_SYNC2; |
| 741 | scc->bearer_caps = PPTP_CTRL_BEARER_DIGITAL2; |
| 742 | |
| 743 | scc->max_channels = 4; /* XXX */ |
| 744 | scc->firmware_revision = MAJOR_VERSION5 << 8 | MINOR_VERSION2; |
| 745 | |
| 746 | /* this implementation only support these strings up to |
| 747 | * 63 character */ |
| 748 | /* host name */ |
| 749 | |
| 750 | if ((val = PPTP_CTRL_CONF(_this)((pptpd_listener *)slist_get(&(_this)->pptpd->listener , (_this)->listener_index))->conf->hostname) == NULL((void *)0)) |
| 751 | val = ""; |
| 752 | strlcpy(scc->host_name, val, sizeof(scc->host_name)); |
| 753 | |
| 754 | /* vendor name */ |
| 755 | if (PPTP_CTRL_CONF(_this)((pptpd_listener *)slist_get(&(_this)->pptpd->listener , (_this)->listener_index))->conf->vendor_name == NULL((void *)0)) |
| 756 | val = PPTPD_DEFAULT_VENDOR_NAME""; |
| 757 | strlcpy(scc->vendor_string, val, sizeof(scc->vendor_string)); |
| 758 | |
| 759 | pptp_ctrl_SCCRx_string(scc, logbuf, sizeof(logbuf)); |
| 760 | pptp_ctrl_log(_this, LOG_INFO6, "SendSCCRP %s", logbuf); |
| 761 | |
| 762 | scc->protocol_version = htons(scc->protocol_version)(__uint16_t)(__builtin_constant_p(scc->protocol_version) ? (__uint16_t)(((__uint16_t)(scc->protocol_version) & 0xffU ) << 8 | ((__uint16_t)(scc->protocol_version) & 0xff00U ) >> 8) : __swap16md(scc->protocol_version)); |
| 763 | scc->framing_caps = htonl(scc->framing_caps)(__uint32_t)(__builtin_constant_p(scc->framing_caps) ? (__uint32_t )(((__uint32_t)(scc->framing_caps) & 0xff) << 24 | ((__uint32_t)(scc->framing_caps) & 0xff00) << 8 | ((__uint32_t)(scc->framing_caps) & 0xff0000) >> 8 | ((__uint32_t)(scc->framing_caps) & 0xff000000) >> 24) : __swap32md(scc->framing_caps)); |
| 764 | scc->bearer_caps = htonl(scc->bearer_caps)(__uint32_t)(__builtin_constant_p(scc->bearer_caps) ? (__uint32_t )(((__uint32_t)(scc->bearer_caps) & 0xff) << 24 | ((__uint32_t)(scc->bearer_caps) & 0xff00) << 8 | ((__uint32_t)(scc->bearer_caps) & 0xff0000) >> 8 | ((__uint32_t)(scc->bearer_caps) & 0xff000000) >> 24) : __swap32md(scc->bearer_caps)); |
| 765 | scc->max_channels = htons(scc->max_channels)(__uint16_t)(__builtin_constant_p(scc->max_channels) ? (__uint16_t )(((__uint16_t)(scc->max_channels) & 0xffU) << 8 | ((__uint16_t)(scc->max_channels) & 0xff00U) >> 8) : __swap16md(scc->max_channels)); |
| 766 | scc->firmware_revision = htons(scc->firmware_revision)(__uint16_t)(__builtin_constant_p(scc->firmware_revision) ? (__uint16_t)(((__uint16_t)(scc->firmware_revision) & 0xffU ) << 8 | ((__uint16_t)(scc->firmware_revision) & 0xff00U) >> 8) : __swap16md(scc->firmware_revision) ); |
| 767 | |
| 768 | pptp_ctrl_output(_this, NULL((void *)0), sizeof(struct pptp_scc)); |
| 769 | |
| 770 | return 0; |
| 771 | } |
| 772 | |
| 773 | /* receive ECHO and reply */ |
| 774 | static void |
| 775 | pptp_ctrl_process_echo_req(pptp_ctrl *_this, u_char *pkt, int lpkt) |
| 776 | { |
| 777 | struct pptp_echo_rq *echo_rq; |
| 778 | struct pptp_echo_rp *echo_rp; |
| 779 | |
| 780 | if (lpkt < sizeof(struct pptp_echo_rq)) { |
| 781 | pptp_ctrl_log(_this, LOG_ERR3, "Received bad EchoReq: packet " |
| 782 | "too short: %d < %d", lpkt, |
| 783 | (int)sizeof(struct pptp_echo_rq)); |
| 784 | return; |
| 785 | } |
| 786 | echo_rq = (struct pptp_echo_rq *)pkt; |
| 787 | |
| 788 | PPTP_CTRL_DBG((_this, LOG_DEBUG, "RecvEchoReq")); |
| 789 | |
| 790 | echo_rp = bytebuffer_pointer(_this->send_buf); |
| 791 | lpkt = bytebuffer_remaining(_this->send_buf); |
| 792 | if (echo_rp == NULL((void *)0) || lpkt < sizeof(struct pptp_echo_rp)) { |
| 793 | pptp_ctrl_log(_this, LOG_ERR3, |
| 794 | "Failed to send EchoReq: No buffer space available"); |
| 795 | return; |
| 796 | } |
| 797 | memset(echo_rp, 0, sizeof(struct pptp_echo_rp)); |
| 798 | |
| 799 | pptp_init_header(&echo_rp->header, sizeof(struct pptp_echo_rp), |
| 800 | PPTP_CTRL_MES_CODE_ECHO_RP6); |
| 801 | |
| 802 | echo_rp->identifier = echo_rq->identifier; |
| 803 | echo_rp->result_code = PPTP_ECHO_RP_RESULT_OK1; |
| 804 | echo_rp->error_code = PPTP_ERROR_NONE0; |
| 805 | echo_rp->reserved1 = htons(0)(__uint16_t)(__builtin_constant_p(0) ? (__uint16_t)(((__uint16_t )(0) & 0xffU) << 8 | ((__uint16_t)(0) & 0xff00U ) >> 8) : __swap16md(0)); |
| 806 | |
| 807 | pptp_ctrl_output(_this, NULL((void *)0), sizeof(struct pptp_echo_rp)); |
| 808 | PPTP_CTRL_DBG((_this, LOG_DEBUG, "SendEchoReply")); |
| 809 | } |
| 810 | |
| 811 | /* receiver Echo-Reply */ |
| 812 | static int |
| 813 | pptp_ctrl_recv_echo_rep(pptp_ctrl *_this, u_char *pkt, int lpkt) |
| 814 | { |
| 815 | struct pptp_echo_rp *echo_rp; |
| 816 | |
| 817 | if (lpkt < sizeof(struct pptp_echo_rp)) { |
| 818 | pptp_ctrl_log(_this, LOG_ERR3, "Received bad EchoReq: packet " |
| 819 | "too short: %d < %d", lpkt, |
| 820 | (int)sizeof(struct pptp_echo_rp)); |
| 821 | return 1; |
| 822 | } |
| 823 | echo_rp = (struct pptp_echo_rp *)pkt; |
| 824 | |
| 825 | if (echo_rp->result_code != PPTP_ECHO_RP_RESULT_OK1) { |
| 826 | pptp_ctrl_log(_this, LOG_ERR3, "Received negative EchoReply: %s", |
| 827 | pptp_general_error_string(echo_rp->error_code)); |
| 828 | return 1; |
| 829 | } |
| 830 | if (_this->echo_seq != ntohl(echo_rp->identifier)(__uint32_t)(__builtin_constant_p(echo_rp->identifier) ? ( __uint32_t)(((__uint32_t)(echo_rp->identifier) & 0xff) << 24 | ((__uint32_t)(echo_rp->identifier) & 0xff00 ) << 8 | ((__uint32_t)(echo_rp->identifier) & 0xff0000 ) >> 8 | ((__uint32_t)(echo_rp->identifier) & 0xff000000 ) >> 24) : __swap32md(echo_rp->identifier))) { |
| 831 | pptp_ctrl_log(_this, LOG_ERR3, "Received bad EchoReply: " |
| 832 | "Identifier mismatch sent=%u recv=%u", |
| 833 | _this->echo_seq , ntohl(echo_rp->identifier)(__uint32_t)(__builtin_constant_p(echo_rp->identifier) ? ( __uint32_t)(((__uint32_t)(echo_rp->identifier) & 0xff) << 24 | ((__uint32_t)(echo_rp->identifier) & 0xff00 ) << 8 | ((__uint32_t)(echo_rp->identifier) & 0xff0000 ) >> 8 | ((__uint32_t)(echo_rp->identifier) & 0xff000000 ) >> 24) : __swap32md(echo_rp->identifier))); |
| 834 | return 1; |
| 835 | } |
| 836 | PPTP_CTRL_DBG((_this, LOG_DEBUG, "RecvEchoReply")); |
| 837 | return 0; |
| 838 | } |
| 839 | |
| 840 | /* send Echo-Request */ |
| 841 | static void |
| 842 | pptp_ctrl_send_echo_req(pptp_ctrl *_this) |
| 843 | { |
| 844 | int lpkt; |
| 845 | struct pptp_echo_rq *echo_rq; |
| 846 | |
| 847 | echo_rq = (struct pptp_echo_rq *)bytebuffer_pointer(_this->send_buf); |
| 848 | lpkt = bytebuffer_remaining(_this->send_buf); |
| 849 | if (echo_rq == NULL((void *)0) || lpkt < sizeof(struct pptp_echo_rq)) { |
| 850 | pptp_ctrl_log(_this, LOG_ERR3, |
| 851 | "SendEchoReq failed: No buffer space available"); |
| 852 | return; |
| 853 | } |
| 854 | memset(echo_rq, 0, sizeof(struct pptp_echo_rq)); |
| 855 | |
| 856 | pptp_init_header(&echo_rq->header, sizeof(struct pptp_echo_rq), |
| 857 | PPTP_CTRL_MES_CODE_ECHO_RQ5); |
| 858 | |
| 859 | echo_rq->identifier = htonl(_this->echo_seq)(__uint32_t)(__builtin_constant_p(_this->echo_seq) ? (__uint32_t )(((__uint32_t)(_this->echo_seq) & 0xff) << 24 | ((__uint32_t)(_this->echo_seq) & 0xff00) << 8 | ((__uint32_t)(_this->echo_seq) & 0xff0000) >> 8 | ((__uint32_t)(_this->echo_seq) & 0xff000000) >> 24) : __swap32md(_this->echo_seq)); |
| 860 | |
| 861 | pptp_ctrl_output(_this, NULL((void *)0), sizeof(struct pptp_echo_rq)); |
| 862 | PPTP_CTRL_DBG((_this, LOG_DEBUG, "SendEchoReq")); |
| 863 | } |
| 864 | |
| 865 | /* send Call-Disconnect-Notify */ |
| 866 | static void |
| 867 | pptp_ctrl_send_CDN(pptp_ctrl *_this, int result, int error, int cause, |
| 868 | const char *statistics) |
| 869 | { |
| 870 | int lpkt; |
| 871 | struct pptp_cdn *cdn; |
| 872 | |
| 873 | cdn = bytebuffer_pointer(_this->send_buf); |
| 874 | lpkt = bytebuffer_remaining(_this->send_buf); |
| 875 | if (lpkt < sizeof(struct pptp_cdn)) { |
| 876 | pptp_ctrl_log(_this, LOG_ERR3, |
| 877 | "SendCCR failed: No buffer space available"); |
| 878 | return; |
| 879 | } |
| 880 | memset(cdn, 0, sizeof(struct pptp_cdn)); |
| 881 | |
| 882 | pptp_init_header(&cdn->header, sizeof(struct pptp_cdn), |
| 883 | PPTP_CTRL_MES_CODE_CDN13); |
| 884 | |
| 885 | cdn->call_id = _this->id; |
| 886 | cdn->result_code = result; |
| 887 | cdn->error_code = error; |
| 888 | cdn->cause_code = cause; |
| 889 | if (statistics != NULL((void *)0)) |
| 890 | strlcpy(cdn->statistics, statistics, sizeof(cdn->statistics)); |
| 891 | |
| 892 | cdn->call_id = htons(cdn->call_id)(__uint16_t)(__builtin_constant_p(cdn->call_id) ? (__uint16_t )(((__uint16_t)(cdn->call_id) & 0xffU) << 8 | (( __uint16_t)(cdn->call_id) & 0xff00U) >> 8) : __swap16md (cdn->call_id)); |
| 893 | cdn->cause_code = htons(cdn->cause_code)(__uint16_t)(__builtin_constant_p(cdn->cause_code) ? (__uint16_t )(((__uint16_t)(cdn->cause_code) & 0xffU) << 8 | ((__uint16_t)(cdn->cause_code) & 0xff00U) >> 8) : __swap16md(cdn->cause_code)); |
| 894 | |
| 895 | pptp_ctrl_output(_this, NULL((void *)0), sizeof(struct pptp_cdn)); |
| 896 | } |
| 897 | |
| 898 | /* receive Control-packet */ |
| 899 | static int |
| 900 | pptp_ctrl_input(pptp_ctrl *_this, u_char *pkt, int lpkt) |
| 901 | { |
| 902 | char errmes[256]; |
| 903 | time_t curr_time; |
| 904 | struct pptp_ctrl_header *hdr; |
| 905 | |
| 906 | PPTP_CTRL_ASSERT(lpkt >= sizeof(struct pptp_ctrl_header)); |
| 907 | |
| 908 | curr_time = get_monosec()((time_t)(get_nanotime() / 1000000000LL)); |
| 909 | hdr = (struct pptp_ctrl_header *)pkt; |
| 910 | |
| 911 | hdr->length = ntohs(hdr->length)(__uint16_t)(__builtin_constant_p(hdr->length) ? (__uint16_t )(((__uint16_t)(hdr->length) & 0xffU) << 8 | ((__uint16_t )(hdr->length) & 0xff00U) >> 8) : __swap16md(hdr ->length)); |
| 912 | hdr->pptp_message_type = ntohs(hdr->pptp_message_type)(__uint16_t)(__builtin_constant_p(hdr->pptp_message_type) ? (__uint16_t)(((__uint16_t)(hdr->pptp_message_type) & 0xffU ) << 8 | ((__uint16_t)(hdr->pptp_message_type) & 0xff00U) >> 8) : __swap16md(hdr->pptp_message_type) ); |
| 913 | hdr->magic_cookie = ntohl(hdr->magic_cookie)(__uint32_t)(__builtin_constant_p(hdr->magic_cookie) ? (__uint32_t )(((__uint32_t)(hdr->magic_cookie) & 0xff) << 24 | ((__uint32_t)(hdr->magic_cookie) & 0xff00) << 8 | ((__uint32_t)(hdr->magic_cookie) & 0xff0000) >> 8 | ((__uint32_t)(hdr->magic_cookie) & 0xff000000) >> 24) : __swap32md(hdr->magic_cookie)); |
| 914 | hdr->control_message_type = ntohs(hdr->control_message_type)(__uint16_t)(__builtin_constant_p(hdr->control_message_type ) ? (__uint16_t)(((__uint16_t)(hdr->control_message_type) & 0xffU) << 8 | ((__uint16_t)(hdr->control_message_type ) & 0xff00U) >> 8) : __swap16md(hdr->control_message_type )); |
| 915 | hdr->reserved0 = ntohs(hdr->reserved0)(__uint16_t)(__builtin_constant_p(hdr->reserved0) ? (__uint16_t )(((__uint16_t)(hdr->reserved0) & 0xffU) << 8 | ( (__uint16_t)(hdr->reserved0) & 0xff00U) >> 8) : __swap16md (hdr->reserved0)); |
| 916 | |
| 917 | /* sanity check */ |
| 918 | PPTP_CTRL_ASSERT(hdr->length <= lpkt); |
| 919 | |
| 920 | _this->last_rcv_ctrl = curr_time; |
| 921 | |
| 922 | if (PPTP_CTRL_CONF(_this)((pptpd_listener *)slist_get(&(_this)->pptpd->listener , (_this)->listener_index))->conf->ctrl_in_pktdump != 0) { |
| 923 | pptp_ctrl_log(_this, LOG_DEBUG7, |
| 924 | "PPTP Control input packet dump: mestype=%s(%d)", |
| 925 | pptp_ctrl_mes_type_string(hdr->control_message_type), |
| 926 | hdr->control_message_type); |
| 927 | show_hd(debug_get_debugfp(), pkt, lpkt); |
| 928 | } |
| 929 | |
| 930 | /* inspect packet body */ |
| 931 | /* message type */ |
| 932 | if (hdr->pptp_message_type != PPTP_MES_TYPE_CTRL1) { |
| 933 | snprintf(errmes, sizeof(errmes), "unknown message type %d", |
| 934 | hdr->pptp_message_type); |
| 935 | goto bad_packet; |
| 936 | } |
| 937 | /* magic cookie */ |
| 938 | if (hdr->magic_cookie != PPTP_MAGIC_COOKIE0x1a2b3c4d) { |
| 939 | snprintf(errmes, sizeof(errmes), "wrong magic %08x != %08x", |
| 940 | hdr->magic_cookie, PPTP_MAGIC_COOKIE0x1a2b3c4d); |
| 941 | goto bad_packet; |
| 942 | } |
| 943 | |
| 944 | /* As there is possibility of state conflicts, |
| 945 | * ECHO Reply requiries special care. |
| 946 | */ |
| 947 | switch (hdr->control_message_type) { |
| 948 | case PPTP_CTRL_MES_CODE_ECHO_RP6: |
| 949 | if (pptp_ctrl_recv_echo_rep(_this, pkt, lpkt) != 0) { |
| 950 | pptp_ctrl_fini(_this); |
| 951 | return 1; |
| 952 | } |
| 953 | return 0; |
| 954 | } |
| 955 | |
| 956 | /* |
| 957 | * State machine |
| 958 | */ |
| 959 | switch (_this->state) { |
| 960 | case PPTP_CTRL_STATE_IDLE0: |
| 961 | switch (hdr->control_message_type) { |
| 962 | case PPTP_CTRL_MES_CODE_SCCRQ1: |
| 963 | if (pptp_ctrl_recv_SCCRQ(_this, pkt, lpkt) != 0) { |
| 964 | return 0; |
| 965 | } |
| 966 | if (pptp_ctrl_send_SCCRP(_this, |
| 967 | PPTP_SCCRP_RESULT_SUCCESS1, PPTP_ERROR_NONE0) != 0) { |
| 968 | return 0; |
| 969 | } |
| 970 | _this->state = PPTP_CTRL_STATE_ESTABLISHED2; |
| 971 | return 0; |
| 972 | default: |
| 973 | break; |
| 974 | } |
| 975 | break; |
| 976 | case PPTP_CTRL_STATE_ESTABLISHED2: |
| 977 | switch (hdr->control_message_type) { |
| 978 | case PPTP_CTRL_MES_CODE_ECHO_RQ5: |
| 979 | pptp_ctrl_process_echo_req(_this, pkt, lpkt); |
| 980 | return 0; |
| 981 | /* dispatch to pptp_call_input() if it is call-related-packet */ |
| 982 | case PPTP_CTRL_MES_CODE_SLI15: |
| 983 | case PPTP_CTRL_MES_CODE_ICRQ9: |
| 984 | case PPTP_CTRL_MES_CODE_ICRP10: |
| 985 | case PPTP_CTRL_MES_CODE_OCRQ7: |
| 986 | case PPTP_CTRL_MES_CODE_OCRP8: |
| 987 | case PPTP_CTRL_MES_CODE_ICCN11: |
| 988 | case PPTP_CTRL_MES_CODE_CDN13: |
| 989 | case PPTP_CTRL_MES_CODE_CCR12: |
| 990 | return pptp_ctrl_call_input(_this, |
| 991 | hdr->control_message_type, pkt, lpkt); |
| 992 | case PPTP_CTRL_MES_CODE_StopCCRQ3: |
| 993 | if (pptp_ctrl_recv_StopCCRQ(_this, pkt, lpkt) != 0) { |
| 994 | pptp_ctrl_stop(_this, |
| 995 | PPTP_StopCCRQ_REASON_STOP_PROTOCOL2); |
| 996 | return 0; |
| 997 | } |
| 998 | if (pptp_ctrl_send_StopCCRP(_this, |
| 999 | PPTP_StopCCRP_RESULT_OK1, PPTP_ERROR_NONE0)!= 0) { |
| 1000 | return 0; |
| 1001 | } |
| 1002 | pptp_ctrl_fini(_this); |
| 1003 | return 1; |
| 1004 | default: |
| 1005 | break; |
| 1006 | } |
| 1007 | case PPTP_CTRL_STATE_WAIT_STOP_REPLY3: |
| 1008 | switch (hdr->control_message_type) { |
| 1009 | case PPTP_CTRL_MES_CODE_StopCCRP4: |
| 1010 | pptp_ctrl_recv_StopCCRP(_this, pkt, lpkt); |
| 1011 | pptp_ctrl_fini(_this); |
| 1012 | return 1; |
| 1013 | } |
| 1014 | break; |
| 1015 | case PPTP_CTRL_STATE_WAIT_CTRL_REPLY1: |
| 1016 | /* XXX this implementation only support PAC mode */ |
| 1017 | break; |
| 1018 | } |
| 1019 | pptp_ctrl_log(_this, LOG_WARNING4, |
| 1020 | "Unhandled control message type=%s(%d)", |
| 1021 | pptp_ctrl_mes_type_string(hdr->control_message_type), |
| 1022 | hdr->control_message_type); |
| 1023 | return 0; |
| 1024 | |
| 1025 | bad_packet: |
| 1026 | pptp_ctrl_log(_this, LOG_ERR3, "Received bad packet: %s", errmes); |
| 1027 | pptp_ctrl_stop(_this, PPTP_StopCCRQ_REASON_STOP_PROTOCOL2); |
| 1028 | |
| 1029 | return 0; |
| 1030 | } |
| 1031 | |
| 1032 | /* receiver PPTP Call related messages */ |
| 1033 | static int |
| 1034 | pptp_ctrl_call_input(pptp_ctrl *_this, int mes_type, u_char *pkt, int lpkt) |
| 1035 | { |
| 1036 | int i, call_id, lpkt0; |
| 1037 | pptp_call *call; |
| 1038 | const char *reason; |
| 1039 | u_char *pkt0; |
| 1040 | |
| 1041 | pkt0 = pkt; |
| 1042 | lpkt0 = lpkt; |
| 1043 | call_id = -1; |
| 1044 | pkt += sizeof(struct pptp_ctrl_header); |
| 1045 | lpkt -= sizeof(struct pptp_ctrl_header); |
| 1046 | reason = "(no reason)"; |
Value stored to 'reason' is never read | |
| 1047 | |
| 1048 | /* sanity check */ |
| 1049 | if (lpkt < 4) { |
| 1050 | reason = "received packet is too short"; |
| 1051 | goto badpacket; |
| 1052 | } |
| 1053 | call = NULL((void *)0); |
| 1054 | call_id = ntohs(*(uint16_t *)pkt)(__uint16_t)(__builtin_constant_p(*(uint16_t *)pkt) ? (__uint16_t )(((__uint16_t)(*(uint16_t *)pkt) & 0xffU) << 8 | ( (__uint16_t)(*(uint16_t *)pkt) & 0xff00U) >> 8) : __swap16md (*(uint16_t *)pkt)); |
| 1055 | |
| 1056 | switch (mes_type) { |
| 1057 | case PPTP_CTRL_MES_CODE_SLI15: /* PNS <=> PAC */ |
| 1058 | /* only SLI contains Call-ID of this peer */ |
| 1059 | for (i = 0; i < slist_length(&_this->call_list); i++) { |
| 1060 | call = slist_get(&_this->call_list, i); |
| 1061 | if (call->id == call_id) |
| 1062 | break; |
| 1063 | call = NULL((void *)0); |
| 1064 | } |
| 1065 | if (call == NULL((void *)0)) { |
| 1066 | reason = "Call Id is not associated by this control"; |
| 1067 | goto badpacket; |
| 1068 | } |
| 1069 | goto call_searched; |
| 1070 | case PPTP_CTRL_MES_CODE_ICRP10: /* PNS => PAC */ |
| 1071 | /* |
| 1072 | * as this implementation never sent ICRQ, this case |
| 1073 | * should not happen. |
| 1074 | * But just to make sure, pptp_call.c can handle this |
| 1075 | * message. |
| 1076 | */ |
| 1077 | /* FALLTHROUGH */ |
| 1078 | case PPTP_CTRL_MES_CODE_OCRQ7: /* PNS => PAC */ |
| 1079 | case PPTP_CTRL_MES_CODE_CCR12: /* PNS => PAC */ |
| 1080 | /* liner-search will be enough */ |
| 1081 | for (i = 0; i < slist_length(&_this->call_list); i++) { |
| 1082 | call = slist_get(&_this->call_list, i); |
| 1083 | if (call->peers_call_id == call_id) |
| 1084 | break; |
| 1085 | call = NULL((void *)0); |
| 1086 | } |
| 1087 | if (call == NULL((void *)0) && mes_type == PPTP_CTRL_MES_CODE_CCR12) { |
| 1088 | pptp_ctrl_send_CDN(_this, PPTP_CDN_RESULT_GENRIC_ERROR2, |
| 1089 | PPTP_ERROR_BAD_CALL4, 0, NULL((void *)0)); |
| 1090 | goto call_searched; |
| 1091 | } |
| 1092 | if (mes_type == PPTP_CTRL_MES_CODE_OCRQ7) { |
| 1093 | /* make new call */ |
| 1094 | if (call != NULL((void *)0)) { |
| 1095 | pptp_call_input(call, mes_type, pkt0, lpkt0); |
| 1096 | return 0; |
| 1097 | } |
| 1098 | if ((call = pptp_call_create()) == NULL((void *)0)) { |
| 1099 | pptp_ctrl_log(_this, LOG_ERR3, |
| 1100 | "pptp_call_create() failed: %m"); |
| 1101 | goto fail; |
| 1102 | } |
| 1103 | if (pptp_call_init(call, _this) != 0) { |
| 1104 | pptp_ctrl_log(_this, LOG_ERR3, |
| 1105 | "pptp_call_init() failed: %m"); |
| 1106 | pptp_call_destroy(call); |
| 1107 | goto fail; |
| 1108 | } |
| 1109 | slist_add(&_this->call_list, call); |
| 1110 | } |
| 1111 | call_searched: |
| 1112 | if (call == NULL((void *)0)) { |
| 1113 | reason = "Call Id is not associated by this control"; |
| 1114 | goto badpacket; |
| 1115 | } |
| 1116 | pptp_call_input(call, mes_type, pkt0, lpkt0); |
| 1117 | return 0; |
| 1118 | case PPTP_CTRL_MES_CODE_OCRP8: /* PAC => PNS */ |
| 1119 | case PPTP_CTRL_MES_CODE_ICRQ9: /* PAC => PNS */ |
| 1120 | case PPTP_CTRL_MES_CODE_ICCN11: /* PAC => PNS */ |
| 1121 | case PPTP_CTRL_MES_CODE_CDN13: /* PAC => PNS */ |
| 1122 | /* don't receive because above messages are only of PNS */ |
| 1123 | default: |
| 1124 | break; |
| 1125 | } |
| 1126 | reason = "Message type is unexpected."; |
| 1127 | /* FALLTHROUGH */ |
| 1128 | badpacket: |
| 1129 | pptp_ctrl_log(_this, LOG_INFO6, |
| 1130 | "Received a bad %s(%d) call_id=%d: %s", |
| 1131 | pptp_ctrl_mes_type_string(mes_type), mes_type, call_id, reason); |
| 1132 | return 0; |
| 1133 | fail: |
| 1134 | pptp_ctrl_stop(_this, PPTP_StopCCRQ_REASON_STOP_PROTOCOL2); |
| 1135 | return 0; |
| 1136 | } |
| 1137 | |
| 1138 | |
| 1139 | /* |
| 1140 | * utilities |
| 1141 | */ |
| 1142 | |
| 1143 | /* logging with the label of the instance */ |
| 1144 | static void |
| 1145 | pptp_ctrl_log(pptp_ctrl *_this, int prio, const char *fmt, ...) |
| 1146 | { |
| 1147 | char logbuf[BUFSIZ1024]; |
| 1148 | va_list ap; |
| 1149 | |
| 1150 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
| 1151 | #ifdef PPTPD_MULTIPLE |
| 1152 | snprintf(logbuf, sizeof(logbuf), "pptpd id=%u ctrl=%u %s", |
| 1153 | _this->pptpd->id, _this->id, fmt); |
| 1154 | #else |
| 1155 | snprintf(logbuf, sizeof(logbuf), "pptpd ctrl=%u %s", _this->id, fmt); |
| 1156 | #endif |
| 1157 | vlog_printf(prio, logbuf, ap); |
| 1158 | va_end(ap)__builtin_va_end(ap); |
| 1159 | } |
| 1160 | |
| 1161 | static const char * |
| 1162 | pptp_ctrl_state_string(int state) |
| 1163 | { |
| 1164 | switch (state) { |
| 1165 | case PPTP_CTRL_STATE_IDLE0: |
| 1166 | return "idle"; |
| 1167 | case PPTP_CTRL_STATE_WAIT_CTRL_REPLY1: |
| 1168 | return "wait-ctrl-reply"; |
| 1169 | case PPTP_CTRL_STATE_ESTABLISHED2: |
| 1170 | return "established"; |
| 1171 | case PPTP_CTRL_STATE_WAIT_STOP_REPLY3: |
| 1172 | return "wait-stop-reply"; |
| 1173 | } |
| 1174 | return "unknown"; |
| 1175 | } |