1 /* crypto/bio/bio_dgram.c */ 2 /* 3 * DTLS implementation written by Nagendra Modadugu 4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. 5 */ 6 /* ==================================================================== 7 * Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * openssl-core@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59 60 61 #include <stdio.h> 62 #include <errno.h> 63 #define USE_SOCKETS 64 #include "cryptlib.h" 65 66 #include <openssl/bio.h> 67 #ifndef OPENSSL_NO_DGRAM 68 69 #if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) 70 #include <sys/timeb.h> 71 #endif 72 73 #ifdef OPENSSL_SYS_LINUX 74 #define IP_MTU 14 /* linux is lame */ 75 #endif 76 77 #ifdef WATT32 78 #define sock_write SockWrite /* Watt-32 uses same names */ 79 #define sock_read SockRead 80 #define sock_puts SockPuts 81 #endif 82 83 static int dgram_write(BIO *h, const char *buf, int num); 84 static int dgram_read(BIO *h, char *buf, int size); 85 static int dgram_puts(BIO *h, const char *str); 86 static long dgram_ctrl(BIO *h, int cmd, long arg1, void *arg2); 87 static int dgram_new(BIO *h); 88 static int dgram_free(BIO *data); 89 static int dgram_clear(BIO *bio); 90 91 static int BIO_dgram_should_retry(int s); 92 93 static void get_current_time(struct timeval *t); 94 95 static BIO_METHOD methods_dgramp= 96 { 97 BIO_TYPE_DGRAM, 98 "datagram socket", 99 dgram_write, 100 dgram_read, 101 dgram_puts, 102 NULL, /* dgram_gets, */ 103 dgram_ctrl, 104 dgram_new, 105 dgram_free, 106 NULL, 107 }; 108 109 typedef struct bio_dgram_data_st 110 { 111 union { 112 struct sockaddr sa; 113 struct sockaddr_in sa_in; 114 #if OPENSSL_USE_IPV6 115 struct sockaddr_in6 sa_in6; 116 #endif 117 } peer; 118 unsigned int connected; 119 unsigned int _errno; 120 unsigned int mtu; 121 struct timeval next_timeout; 122 struct timeval socket_timeout; 123 } bio_dgram_data; 124 125 BIO_METHOD *BIO_s_datagram(void) 126 { 127 return(&methods_dgramp); 128 } 129 130 BIO *BIO_new_dgram(int fd, int close_flag) 131 { 132 BIO *ret; 133 134 ret=BIO_new(BIO_s_datagram()); 135 if (ret == NULL) return(NULL); 136 BIO_set_fd(ret,fd,close_flag); 137 return(ret); 138 } 139 140 static int dgram_new(BIO *bi) 141 { 142 bio_dgram_data *data = NULL; 143 144 bi->init=0; 145 bi->num=0; 146 data = OPENSSL_malloc(sizeof(bio_dgram_data)); 147 if (data == NULL) 148 return 0; 149 memset(data, 0x00, sizeof(bio_dgram_data)); 150 bi->ptr = data; 151 152 bi->flags=0; 153 return(1); 154 } 155 156 static int dgram_free(BIO *a) 157 { 158 bio_dgram_data *data; 159 160 if (a == NULL) return(0); 161 if ( ! dgram_clear(a)) 162 return 0; 163 164 data = (bio_dgram_data *)a->ptr; 165 if(data != NULL) OPENSSL_free(data); 166 167 return(1); 168 } 169 170 static int dgram_clear(BIO *a) 171 { 172 if (a == NULL) return(0); 173 if (a->shutdown) 174 { 175 if (a->init) 176 { 177 SHUTDOWN2(a->num); 178 } 179 a->init=0; 180 a->flags=0; 181 } 182 return(1); 183 } 184 185 static void dgram_adjust_rcv_timeout(BIO *b) 186 { 187 #if defined(SO_RCVTIMEO) 188 bio_dgram_data *data = (bio_dgram_data *)b->ptr; 189 int sz = sizeof(int); 190 191 /* Is a timer active? */ 192 if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0) 193 { 194 struct timeval timenow, timeleft; 195 196 /* Read current socket timeout */ 197 #ifdef OPENSSL_SYS_WINDOWS 198 int timeout; 199 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, 200 (void*)&timeout, &sz) < 0) 201 { perror("getsockopt"); } 202 else 203 { 204 data->socket_timeout.tv_sec = timeout / 1000; 205 data->socket_timeout.tv_usec = (timeout % 1000) * 1000; 206 } 207 #else 208 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, 209 &(data->socket_timeout), (void *)&sz) < 0) 210 { perror("getsockopt"); } 211 #endif 212 213 /* Get current time */ 214 get_current_time(&timenow); 215 216 /* Calculate time left until timer expires */ 217 memcpy(&timeleft, &(data->next_timeout), sizeof(struct timeval)); 218 timeleft.tv_sec -= timenow.tv_sec; 219 timeleft.tv_usec -= timenow.tv_usec; 220 if (timeleft.tv_usec < 0) 221 { 222 timeleft.tv_sec--; 223 timeleft.tv_usec += 1000000; 224 } 225 226 if (timeleft.tv_sec < 0) 227 { 228 timeleft.tv_sec = 0; 229 timeleft.tv_usec = 1; 230 } 231 232 /* Adjust socket timeout if next handhake message timer 233 * will expire earlier. 234 */ 235 if ((data->socket_timeout.tv_sec == 0 && data->socket_timeout.tv_usec == 0) || 236 (data->socket_timeout.tv_sec > timeleft.tv_sec) || 237 (data->socket_timeout.tv_sec == timeleft.tv_sec && 238 data->socket_timeout.tv_usec >= timeleft.tv_usec)) 239 { 240 #ifdef OPENSSL_SYS_WINDOWS 241 timeout = timeleft.tv_sec * 1000 + timeleft.tv_usec / 1000; 242 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, 243 (void*)&timeout, sizeof(timeout)) < 0) 244 { perror("setsockopt"); } 245 #else 246 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &timeleft, 247 sizeof(struct timeval)) < 0) 248 { perror("setsockopt"); } 249 #endif 250 } 251 } 252 #endif 253 } 254 255 static void dgram_reset_rcv_timeout(BIO *b) 256 { 257 #if defined(SO_RCVTIMEO) 258 bio_dgram_data *data = (bio_dgram_data *)b->ptr; 259 260 /* Is a timer active? */ 261 if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0) 262 { 263 #ifdef OPENSSL_SYS_WINDOWS 264 int timeout = data->socket_timeout.tv_sec * 1000 + 265 data->socket_timeout.tv_usec / 1000; 266 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, 267 (void*)&timeout, sizeof(timeout)) < 0) 268 { perror("setsockopt"); } 269 #else 270 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, &(data->socket_timeout), 271 sizeof(struct timeval)) < 0) 272 { perror("setsockopt"); } 273 #endif 274 } 275 #endif 276 } 277 278 static int dgram_read(BIO *b, char *out, int outl) 279 { 280 int ret=0; 281 bio_dgram_data *data = (bio_dgram_data *)b->ptr; 282 283 struct { 284 /* 285 * See commentary in b_sock.c. <appro> 286 */ 287 union { size_t s; int i; } len; 288 union { 289 struct sockaddr sa; 290 struct sockaddr_in sa_in; 291 #if OPENSSL_USE_IPV6 292 struct sockaddr_in6 sa_in6; 293 #endif 294 } peer; 295 } sa; 296 297 sa.len.s=0; 298 sa.len.i=sizeof(sa.peer); 299 300 if (out != NULL) 301 { 302 clear_socket_error(); 303 memset(&sa.peer, 0x00, sizeof(sa.peer)); 304 dgram_adjust_rcv_timeout(b); 305 ret=recvfrom(b->num,out,outl,0,&sa.peer.sa,(void *)&sa.len); 306 if (sizeof(sa.len.i)!=sizeof(sa.len.s) && sa.len.i==0) 307 { 308 OPENSSL_assert(sa.len.s<=sizeof(sa.peer)); 309 sa.len.i = (int)sa.len.s; 310 } 311 312 if ( ! data->connected && ret >= 0) 313 BIO_ctrl(b, BIO_CTRL_DGRAM_SET_PEER, 0, &sa.peer); 314 315 BIO_clear_retry_flags(b); 316 if (ret < 0) 317 { 318 if (BIO_dgram_should_retry(ret)) 319 { 320 BIO_set_retry_read(b); 321 data->_errno = get_last_socket_error(); 322 } 323 } 324 325 dgram_reset_rcv_timeout(b); 326 } 327 return(ret); 328 } 329 330 static int dgram_write(BIO *b, const char *in, int inl) 331 { 332 int ret; 333 bio_dgram_data *data = (bio_dgram_data *)b->ptr; 334 clear_socket_error(); 335 336 if ( data->connected ) 337 ret=writesocket(b->num,in,inl); 338 else 339 { 340 int peerlen = sizeof(data->peer); 341 342 if (data->peer.sa.sa_family == AF_INET) 343 peerlen = sizeof(data->peer.sa_in); 344 #if OPENSSL_USE_IPV6 345 else if (data->peer.sa.sa_family == AF_INET6) 346 peerlen = sizeof(data->peer.sa_in6); 347 #endif 348 #if defined(NETWARE_CLIB) && defined(NETWARE_BSDSOCK) 349 ret=sendto(b->num, (char *)in, inl, 0, &data->peer.sa, peerlen); 350 #else 351 ret=sendto(b->num, in, inl, 0, &data->peer.sa, peerlen); 352 #endif 353 } 354 355 BIO_clear_retry_flags(b); 356 if (ret <= 0) 357 { 358 if (BIO_dgram_should_retry(ret)) 359 { 360 BIO_set_retry_write(b); 361 data->_errno = get_last_socket_error(); 362 363 #if 0 /* higher layers are responsible for querying MTU, if necessary */ 364 if ( data->_errno == EMSGSIZE) 365 /* retrieve the new MTU */ 366 BIO_ctrl(b, BIO_CTRL_DGRAM_QUERY_MTU, 0, NULL); 367 #endif 368 } 369 } 370 return(ret); 371 } 372 373 static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr) 374 { 375 long ret=1; 376 int *ip; 377 struct sockaddr *to = NULL; 378 bio_dgram_data *data = NULL; 379 #if defined(IP_MTU_DISCOVER) || defined(IP_MTU) 380 long sockopt_val = 0; 381 unsigned int sockopt_len = 0; 382 #endif 383 #ifdef OPENSSL_SYS_LINUX 384 socklen_t addr_len; 385 union { 386 struct sockaddr sa; 387 struct sockaddr_in s4; 388 #if OPENSSL_USE_IPV6 389 struct sockaddr_in6 s6; 390 #endif 391 } addr; 392 #endif 393 394 data = (bio_dgram_data *)b->ptr; 395 396 switch (cmd) 397 { 398 case BIO_CTRL_RESET: 399 num=0; 400 case BIO_C_FILE_SEEK: 401 ret=0; 402 break; 403 case BIO_C_FILE_TELL: 404 case BIO_CTRL_INFO: 405 ret=0; 406 break; 407 case BIO_C_SET_FD: 408 dgram_clear(b); 409 b->num= *((int *)ptr); 410 b->shutdown=(int)num; 411 b->init=1; 412 break; 413 case BIO_C_GET_FD: 414 if (b->init) 415 { 416 ip=(int *)ptr; 417 if (ip != NULL) *ip=b->num; 418 ret=b->num; 419 } 420 else 421 ret= -1; 422 break; 423 case BIO_CTRL_GET_CLOSE: 424 ret=b->shutdown; 425 break; 426 case BIO_CTRL_SET_CLOSE: 427 b->shutdown=(int)num; 428 break; 429 case BIO_CTRL_PENDING: 430 case BIO_CTRL_WPENDING: 431 ret=0; 432 break; 433 case BIO_CTRL_DUP: 434 case BIO_CTRL_FLUSH: 435 ret=1; 436 break; 437 case BIO_CTRL_DGRAM_CONNECT: 438 to = (struct sockaddr *)ptr; 439 #if 0 440 if (connect(b->num, to, sizeof(struct sockaddr)) < 0) 441 { perror("connect"); ret = 0; } 442 else 443 { 444 #endif 445 switch (to->sa_family) 446 { 447 case AF_INET: 448 memcpy(&data->peer,to,sizeof(data->peer.sa_in)); 449 break; 450 #if OPENSSL_USE_IPV6 451 case AF_INET6: 452 memcpy(&data->peer,to,sizeof(data->peer.sa_in6)); 453 break; 454 #endif 455 default: 456 memcpy(&data->peer,to,sizeof(data->peer.sa)); 457 break; 458 } 459 #if 0 460 } 461 #endif 462 break; 463 /* (Linux)kernel sets DF bit on outgoing IP packets */ 464 case BIO_CTRL_DGRAM_MTU_DISCOVER: 465 #ifdef OPENSSL_SYS_LINUX 466 addr_len = (socklen_t)sizeof(addr); 467 memset((void *)&addr, 0, sizeof(addr)); 468 if (getsockname(b->num, &addr.sa, &addr_len) < 0) 469 { 470 ret = 0; 471 break; 472 } 473 sockopt_len = sizeof(sockopt_val); 474 switch (addr.sa.sa_family) 475 { 476 case AF_INET: 477 sockopt_val = IP_PMTUDISC_DO; 478 if ((ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER, 479 &sockopt_val, sizeof(sockopt_val))) < 0) 480 perror("setsockopt"); 481 break; 482 #if OPENSSL_USE_IPV6 && defined(IPV6_MTU_DISCOVER) 483 case AF_INET6: 484 sockopt_val = IPV6_PMTUDISC_DO; 485 if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER, 486 &sockopt_val, sizeof(sockopt_val))) < 0) 487 perror("setsockopt"); 488 break; 489 #endif 490 default: 491 ret = -1; 492 break; 493 } 494 ret = -1; 495 #else 496 break; 497 #endif 498 case BIO_CTRL_DGRAM_QUERY_MTU: 499 #ifdef OPENSSL_SYS_LINUX 500 addr_len = (socklen_t)sizeof(addr); 501 memset((void *)&addr, 0, sizeof(addr)); 502 if (getsockname(b->num, &addr.sa, &addr_len) < 0) 503 { 504 ret = 0; 505 break; 506 } 507 sockopt_len = sizeof(sockopt_val); 508 switch (addr.sa.sa_family) 509 { 510 case AF_INET: 511 if ((ret = getsockopt(b->num, IPPROTO_IP, IP_MTU, (void *)&sockopt_val, 512 &sockopt_len)) < 0 || sockopt_val < 0) 513 { 514 ret = 0; 515 } 516 else 517 { 518 /* we assume that the transport protocol is UDP and no 519 * IP options are used. 520 */ 521 data->mtu = sockopt_val - 8 - 20; 522 ret = data->mtu; 523 } 524 break; 525 #if OPENSSL_USE_IPV6 && defined(IPV6_MTU) 526 case AF_INET6: 527 if ((ret = getsockopt(b->num, IPPROTO_IPV6, IPV6_MTU, (void *)&sockopt_val, 528 &sockopt_len)) < 0 || sockopt_val < 0) 529 { 530 ret = 0; 531 } 532 else 533 { 534 /* we assume that the transport protocol is UDP and no 535 * IPV6 options are used. 536 */ 537 data->mtu = sockopt_val - 8 - 40; 538 ret = data->mtu; 539 } 540 break; 541 #endif 542 default: 543 ret = 0; 544 break; 545 } 546 #else 547 ret = 0; 548 #endif 549 break; 550 case BIO_CTRL_DGRAM_GET_MTU: 551 return data->mtu; 552 break; 553 case BIO_CTRL_DGRAM_SET_MTU: 554 data->mtu = num; 555 ret = num; 556 break; 557 case BIO_CTRL_DGRAM_SET_CONNECTED: 558 to = (struct sockaddr *)ptr; 559 560 if ( to != NULL) 561 { 562 data->connected = 1; 563 switch (to->sa_family) 564 { 565 case AF_INET: 566 memcpy(&data->peer,to,sizeof(data->peer.sa_in)); 567 break; 568 #if OPENSSL_USE_IPV6 569 case AF_INET6: 570 memcpy(&data->peer,to,sizeof(data->peer.sa_in6)); 571 break; 572 #endif 573 default: 574 memcpy(&data->peer,to,sizeof(data->peer.sa)); 575 break; 576 } 577 } 578 else 579 { 580 data->connected = 0; 581 memset(&(data->peer), 0x00, sizeof(data->peer)); 582 } 583 break; 584 case BIO_CTRL_DGRAM_GET_PEER: 585 switch (data->peer.sa.sa_family) 586 { 587 case AF_INET: 588 ret=sizeof(data->peer.sa_in); 589 break; 590 #if OPENSSL_USE_IPV6 591 case AF_INET6: 592 ret=sizeof(data->peer.sa_in6); 593 break; 594 #endif 595 default: 596 ret=sizeof(data->peer.sa); 597 break; 598 } 599 if (num==0 || num>ret) 600 num=ret; 601 memcpy(ptr,&data->peer,(ret=num)); 602 break; 603 case BIO_CTRL_DGRAM_SET_PEER: 604 to = (struct sockaddr *) ptr; 605 switch (to->sa_family) 606 { 607 case AF_INET: 608 memcpy(&data->peer,to,sizeof(data->peer.sa_in)); 609 break; 610 #if OPENSSL_USE_IPV6 611 case AF_INET6: 612 memcpy(&data->peer,to,sizeof(data->peer.sa_in6)); 613 break; 614 #endif 615 default: 616 memcpy(&data->peer,to,sizeof(data->peer.sa)); 617 break; 618 } 619 break; 620 case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT: 621 memcpy(&(data->next_timeout), ptr, sizeof(struct timeval)); 622 break; 623 #if defined(SO_RCVTIMEO) 624 case BIO_CTRL_DGRAM_SET_RECV_TIMEOUT: 625 #ifdef OPENSSL_SYS_WINDOWS 626 { 627 struct timeval *tv = (struct timeval *)ptr; 628 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000; 629 if (setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, 630 (void*)&timeout, sizeof(timeout)) < 0) 631 { perror("setsockopt"); ret = -1; } 632 } 633 #else 634 if ( setsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, ptr, 635 sizeof(struct timeval)) < 0) 636 { perror("setsockopt"); ret = -1; } 637 #endif 638 break; 639 case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT: 640 #ifdef OPENSSL_SYS_WINDOWS 641 { 642 int timeout, sz = sizeof(timeout); 643 struct timeval *tv = (struct timeval *)ptr; 644 if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, 645 (void*)&timeout, &sz) < 0) 646 { perror("getsockopt"); ret = -1; } 647 else 648 { 649 tv->tv_sec = timeout / 1000; 650 tv->tv_usec = (timeout % 1000) * 1000; 651 ret = sizeof(*tv); 652 } 653 } 654 #else 655 if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, 656 ptr, (void *)&ret) < 0) 657 { perror("getsockopt"); ret = -1; } 658 #endif 659 break; 660 #endif 661 #if defined(SO_SNDTIMEO) 662 case BIO_CTRL_DGRAM_SET_SEND_TIMEOUT: 663 #ifdef OPENSSL_SYS_WINDOWS 664 { 665 struct timeval *tv = (struct timeval *)ptr; 666 int timeout = tv->tv_sec * 1000 + tv->tv_usec/1000; 667 if (setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, 668 (void*)&timeout, sizeof(timeout)) < 0) 669 { perror("setsockopt"); ret = -1; } 670 } 671 #else 672 if ( setsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, ptr, 673 sizeof(struct timeval)) < 0) 674 { perror("setsockopt"); ret = -1; } 675 #endif 676 break; 677 case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT: 678 #ifdef OPENSSL_SYS_WINDOWS 679 { 680 int timeout, sz = sizeof(timeout); 681 struct timeval *tv = (struct timeval *)ptr; 682 if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, 683 (void*)&timeout, &sz) < 0) 684 { perror("getsockopt"); ret = -1; } 685 else 686 { 687 tv->tv_sec = timeout / 1000; 688 tv->tv_usec = (timeout % 1000) * 1000; 689 ret = sizeof(*tv); 690 } 691 } 692 #else 693 if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, 694 ptr, (void *)&ret) < 0) 695 { perror("getsockopt"); ret = -1; } 696 #endif 697 break; 698 #endif 699 case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP: 700 /* fall-through */ 701 case BIO_CTRL_DGRAM_GET_RECV_TIMER_EXP: 702 #ifdef OPENSSL_SYS_WINDOWS 703 if ( data->_errno == WSAETIMEDOUT) 704 #else 705 if ( data->_errno == EAGAIN) 706 #endif 707 { 708 ret = 1; 709 data->_errno = 0; 710 } 711 else 712 ret = 0; 713 break; 714 #ifdef EMSGSIZE 715 case BIO_CTRL_DGRAM_MTU_EXCEEDED: 716 if ( data->_errno == EMSGSIZE) 717 { 718 ret = 1; 719 data->_errno = 0; 720 } 721 else 722 ret = 0; 723 break; 724 #endif 725 default: 726 ret=0; 727 break; 728 } 729 return(ret); 730 } 731 732 static int dgram_puts(BIO *bp, const char *str) 733 { 734 int n,ret; 735 736 n=strlen(str); 737 ret=dgram_write(bp,str,n); 738 return(ret); 739 } 740 741 static int BIO_dgram_should_retry(int i) 742 { 743 int err; 744 745 if ((i == 0) || (i == -1)) 746 { 747 err=get_last_socket_error(); 748 749 #if defined(OPENSSL_SYS_WINDOWS) 750 /* If the socket return value (i) is -1 751 * and err is unexpectedly 0 at this point, 752 * the error code was overwritten by 753 * another system call before this error 754 * handling is called. 755 */ 756 #endif 757 758 return(BIO_dgram_non_fatal_error(err)); 759 } 760 return(0); 761 } 762 763 int BIO_dgram_non_fatal_error(int err) 764 { 765 switch (err) 766 { 767 #if defined(OPENSSL_SYS_WINDOWS) 768 # if defined(WSAEWOULDBLOCK) 769 case WSAEWOULDBLOCK: 770 # endif 771 772 # if 0 /* This appears to always be an error */ 773 # if defined(WSAENOTCONN) 774 case WSAENOTCONN: 775 # endif 776 # endif 777 #endif 778 779 #ifdef EWOULDBLOCK 780 # ifdef WSAEWOULDBLOCK 781 # if WSAEWOULDBLOCK != EWOULDBLOCK 782 case EWOULDBLOCK: 783 # endif 784 # else 785 case EWOULDBLOCK: 786 # endif 787 #endif 788 789 #ifdef EINTR 790 case EINTR: 791 #endif 792 793 #ifdef EAGAIN 794 #if EWOULDBLOCK != EAGAIN 795 case EAGAIN: 796 # endif 797 #endif 798 799 #ifdef EPROTO 800 case EPROTO: 801 #endif 802 803 #ifdef EINPROGRESS 804 case EINPROGRESS: 805 #endif 806 807 #ifdef EALREADY 808 case EALREADY: 809 #endif 810 811 return(1); 812 /* break; */ 813 default: 814 break; 815 } 816 return(0); 817 } 818 819 static void get_current_time(struct timeval *t) 820 { 821 #ifdef OPENSSL_SYS_WIN32 822 struct _timeb tb; 823 _ftime(&tb); 824 t->tv_sec = (long)tb.time; 825 t->tv_usec = (long)tb.millitm * 1000; 826 #elif defined(OPENSSL_SYS_VMS) 827 struct timeb tb; 828 ftime(&tb); 829 t->tv_sec = (long)tb.time; 830 t->tv_usec = (long)tb.millitm * 1000; 831 #else 832 gettimeofday(t, NULL); 833 #endif 834 } 835 836 #endif 837