1 /* 2 * Copyright (c) 1997-2001 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "kdc_locl.h" 35 36 RCSID("$Id: connect.c,v 1.82 2001/05/14 06:18:11 assar Exp $"); 37 38 /* 39 * a tuple describing on what to listen 40 */ 41 42 struct port_desc{ 43 int family; 44 int type; 45 int port; 46 }; 47 48 /* the current ones */ 49 50 static struct port_desc *ports; 51 static int num_ports; 52 53 /* 54 * add `family, port, protocol' to the list with duplicate suppresion. 55 */ 56 57 static void 58 add_port(int family, int port, const char *protocol) 59 { 60 int type; 61 int i; 62 63 if(strcmp(protocol, "udp") == 0) 64 type = SOCK_DGRAM; 65 else if(strcmp(protocol, "tcp") == 0) 66 type = SOCK_STREAM; 67 else 68 return; 69 for(i = 0; i < num_ports; i++){ 70 if(ports[i].type == type 71 && ports[i].port == port 72 && ports[i].family == family) 73 return; 74 } 75 ports = realloc(ports, (num_ports + 1) * sizeof(*ports)); 76 if (ports == NULL) 77 krb5_err (context, 1, errno, "realloc"); 78 ports[num_ports].family = family; 79 ports[num_ports].type = type; 80 ports[num_ports].port = port; 81 num_ports++; 82 } 83 84 /* 85 * add a triple but with service -> port lookup 86 * (this prints warnings for stuff that does not exist) 87 */ 88 89 static void 90 add_port_service(int family, const char *service, int port, 91 const char *protocol) 92 { 93 port = krb5_getportbyname (context, service, protocol, port); 94 add_port (family, port, protocol); 95 } 96 97 /* 98 * add the port with service -> port lookup or string -> number 99 * (no warning is printed) 100 */ 101 102 static void 103 add_port_string (int family, const char *port_str, const char *protocol) 104 { 105 struct servent *sp; 106 int port; 107 108 sp = roken_getservbyname (port_str, protocol); 109 if (sp != NULL) { 110 port = sp->s_port; 111 } else { 112 char *end; 113 114 port = htons(strtol(port_str, &end, 0)); 115 if (end == port_str) 116 return; 117 } 118 add_port (family, port, protocol); 119 } 120 121 /* 122 * add the standard collection of ports for `family' 123 */ 124 125 static void 126 add_standard_ports (int family) 127 { 128 add_port_service(family, "kerberos", 88, "udp"); 129 add_port_service(family, "kerberos", 88, "tcp"); 130 add_port_service(family, "kerberos-sec", 88, "udp"); 131 add_port_service(family, "kerberos-sec", 88, "tcp"); 132 if(enable_http) 133 add_port_service(family, "http", 80, "tcp"); 134 #ifdef KRB4 135 if(enable_v4) { 136 add_port_service(family, "kerberos-iv", 750, "udp"); 137 add_port_service(family, "kerberos-iv", 750, "tcp"); 138 } 139 if(enable_524) { 140 add_port_service(family, "krb524", 4444, "udp"); 141 add_port_service(family, "krb524", 4444, "tcp"); 142 } 143 #endif 144 #ifdef KASERVER 145 if (enable_kaserver) 146 add_port_service(family, "afs3-kaserver", 7004, "udp"); 147 #endif 148 } 149 150 /* 151 * parse the set of space-delimited ports in `str' and add them. 152 * "+" => all the standard ones 153 * otherwise it's port|service[/protocol] 154 */ 155 156 static void 157 parse_ports(const char *str) 158 { 159 char *pos = NULL; 160 char *p; 161 char *str_copy = strdup (str); 162 163 p = strtok_r(str_copy, " \t", &pos); 164 while(p != NULL) { 165 if(strcmp(p, "+") == 0) { 166 #ifdef HAVE_IPV6 167 add_standard_ports(AF_INET6); 168 #endif 169 add_standard_ports(AF_INET); 170 } else { 171 char *q = strchr(p, '/'); 172 if(q){ 173 *q++ = 0; 174 #ifdef HAVE_IPV6 175 add_port_string(AF_INET6, p, q); 176 #endif 177 add_port_string(AF_INET, p, q); 178 }else { 179 #ifdef HAVE_IPV6 180 add_port_string(AF_INET6, p, "udp"); 181 add_port_string(AF_INET6, p, "tcp"); 182 #endif 183 add_port_string(AF_INET, p, "udp"); 184 add_port_string(AF_INET, p, "tcp"); 185 } 186 } 187 188 p = strtok_r(NULL, " \t", &pos); 189 } 190 free (str_copy); 191 } 192 193 /* 194 * every socket we listen on 195 */ 196 197 struct descr { 198 int s; 199 int type; 200 unsigned char *buf; 201 size_t size; 202 size_t len; 203 time_t timeout; 204 struct sockaddr_storage __ss; 205 struct sockaddr *sa; 206 socklen_t sock_len; 207 char addr_string[128]; 208 }; 209 210 static void 211 init_descr(struct descr *d) 212 { 213 memset(d, 0, sizeof(*d)); 214 d->sa = (struct sockaddr *)&d->__ss; 215 d->s = -1; 216 } 217 218 /* 219 * re-intialize all `n' ->sa in `d'. 220 */ 221 222 static void 223 reinit_descrs (struct descr *d, int n) 224 { 225 int i; 226 227 for (i = 0; i < n; ++i) 228 d[i].sa = (struct sockaddr *)&d[i].__ss; 229 } 230 231 /* 232 * Create the socket (family, type, port) in `d' 233 */ 234 235 static void 236 init_socket(struct descr *d, krb5_address *a, int family, int type, int port) 237 { 238 krb5_error_code ret; 239 struct sockaddr_storage __ss; 240 struct sockaddr *sa = (struct sockaddr *)&__ss; 241 int sa_size; 242 243 init_descr (d); 244 245 ret = krb5_addr2sockaddr (context, a, sa, &sa_size, port); 246 if (ret) { 247 krb5_warn(context, ret, "krb5_addr2sockaddr"); 248 close(d->s); 249 d->s = -1; 250 return; 251 } 252 253 if (sa->sa_family != family) 254 return; 255 256 d->s = socket(family, type, 0); 257 if(d->s < 0){ 258 krb5_warn(context, errno, "socket(%d, %d, 0)", family, type); 259 d->s = -1; 260 return; 261 } 262 #if defined(HAVE_SETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_REUSEADDR) 263 { 264 int one = 1; 265 setsockopt(d->s, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one)); 266 } 267 #endif 268 d->type = type; 269 270 if(bind(d->s, sa, sa_size) < 0){ 271 char a_str[256]; 272 size_t len; 273 274 krb5_print_address (a, a_str, sizeof(a_str), &len); 275 krb5_warn(context, errno, "bind %s/%d", a_str, ntohs(port)); 276 close(d->s); 277 d->s = -1; 278 return; 279 } 280 if(type == SOCK_STREAM && listen(d->s, SOMAXCONN) < 0){ 281 char a_str[256]; 282 size_t len; 283 284 krb5_print_address (a, a_str, sizeof(a_str), &len); 285 krb5_warn(context, errno, "listen %s/%d", a_str, ntohs(port)); 286 close(d->s); 287 d->s = -1; 288 return; 289 } 290 } 291 292 /* 293 * Allocate descriptors for all the sockets that we should listen on 294 * and return the number of them. 295 */ 296 297 static int 298 init_sockets(struct descr **desc) 299 { 300 krb5_error_code ret; 301 int i, j; 302 struct descr *d; 303 int num = 0; 304 krb5_addresses addresses; 305 306 if (explicit_addresses.len) { 307 addresses = explicit_addresses; 308 } else { 309 ret = krb5_get_all_server_addrs (context, &addresses); 310 if (ret) 311 krb5_err (context, 1, ret, "krb5_get_all_server_addrs"); 312 } 313 parse_ports(port_str); 314 d = malloc(addresses.len * num_ports * sizeof(*d)); 315 if (d == NULL) 316 krb5_errx(context, 1, "malloc(%lu) failed", 317 (unsigned long)num_ports * sizeof(*d)); 318 319 for (i = 0; i < num_ports; i++){ 320 for (j = 0; j < addresses.len; ++j) { 321 init_socket(&d[num], &addresses.val[j], 322 ports[i].family, ports[i].type, ports[i].port); 323 if(d[num].s != -1){ 324 char a_str[80]; 325 size_t len; 326 327 krb5_print_address (&addresses.val[j], a_str, 328 sizeof(a_str), &len); 329 330 kdc_log(5, "listening on %s port %u/%s", 331 a_str, 332 ntohs(ports[i].port), 333 (ports[i].type == SOCK_STREAM) ? "tcp" : "udp"); 334 /* XXX */ 335 num++; 336 } 337 } 338 } 339 krb5_free_addresses (context, &addresses); 340 d = realloc(d, num * sizeof(*d)); 341 if (d == NULL && num != 0) 342 krb5_errx(context, 1, "realloc(%lu) failed", 343 (unsigned long)num * sizeof(*d)); 344 reinit_descrs (d, num); 345 *desc = d; 346 return num; 347 } 348 349 /* 350 * handle the request in `buf, len', from `addr' (or `from' as a string), 351 * sending a reply in `reply'. 352 */ 353 354 static int 355 process_request(unsigned char *buf, 356 size_t len, 357 krb5_data *reply, 358 int *sendlength, 359 const char *from, 360 struct sockaddr *addr) 361 { 362 KDC_REQ req; 363 #ifdef KRB4 364 Ticket ticket; 365 #endif 366 krb5_error_code ret; 367 size_t i; 368 369 gettimeofday(&now, NULL); 370 if(decode_AS_REQ(buf, len, &req, &i) == 0){ 371 ret = as_rep(&req, reply, from, addr); 372 free_AS_REQ(&req); 373 return ret; 374 }else if(decode_TGS_REQ(buf, len, &req, &i) == 0){ 375 ret = tgs_rep(&req, reply, from, addr); 376 free_TGS_REQ(&req); 377 return ret; 378 } 379 #ifdef KRB4 380 else if(maybe_version4(buf, len)){ 381 *sendlength = 0; /* elbitapmoc sdrawkcab XXX */ 382 do_version4(buf, len, reply, from, (struct sockaddr_in*)addr); 383 return 0; 384 }else if(decode_Ticket(buf, len, &ticket, &i) == 0){ 385 ret = do_524(&ticket, reply, from, addr); 386 free_Ticket(&ticket); 387 return ret; 388 } 389 #endif 390 #ifdef KASERVER 391 else if (enable_kaserver) { 392 ret = do_kaserver (buf, len, reply, from, (struct sockaddr_in*)addr); 393 return ret; 394 } 395 #endif 396 397 return -1; 398 } 399 400 static void 401 addr_to_string(struct sockaddr *addr, size_t addr_len, char *str, size_t len) 402 { 403 krb5_address a; 404 krb5_sockaddr2address(context, addr, &a); 405 if(krb5_print_address(&a, str, len, &len) == 0) { 406 krb5_free_address(context, &a); 407 return; 408 } 409 krb5_free_address(context, &a); 410 snprintf(str, len, "<family=%d>", addr->sa_family); 411 } 412 413 /* 414 * Handle the request in `buf, len' to socket `d' 415 */ 416 417 static void 418 do_request(void *buf, size_t len, int sendlength, 419 struct descr *d) 420 { 421 krb5_error_code ret; 422 krb5_data reply; 423 424 reply.length = 0; 425 ret = process_request(buf, len, &reply, &sendlength, 426 d->addr_string, d->sa); 427 if(reply.length){ 428 kdc_log(5, "sending %d bytes to %s", reply.length, d->addr_string); 429 if(sendlength){ 430 unsigned char len[4]; 431 len[0] = (reply.length >> 24) & 0xff; 432 len[1] = (reply.length >> 16) & 0xff; 433 len[2] = (reply.length >> 8) & 0xff; 434 len[3] = reply.length & 0xff; 435 if(sendto(d->s, len, sizeof(len), 0, d->sa, d->sock_len) < 0) { 436 kdc_log (0, "sendto(%s): %s", d->addr_string, strerror(errno)); 437 krb5_data_free(&reply); 438 return; 439 } 440 } 441 if(sendto(d->s, reply.data, reply.length, 0, d->sa, d->sock_len) < 0) { 442 kdc_log (0, "sendto(%s): %s", d->addr_string, strerror(errno)); 443 krb5_data_free(&reply); 444 return; 445 } 446 krb5_data_free(&reply); 447 } 448 if(ret) 449 kdc_log(0, "Failed processing %lu byte request from %s", 450 (unsigned long)len, d->addr_string); 451 } 452 453 /* 454 * Handle incoming data to the UDP socket in `d' 455 */ 456 457 static void 458 handle_udp(struct descr *d) 459 { 460 unsigned char *buf; 461 int n; 462 463 buf = malloc(max_request); 464 if(buf == NULL){ 465 kdc_log(0, "Failed to allocate %lu bytes", (unsigned long)max_request); 466 return; 467 } 468 469 d->sock_len = sizeof(d->__ss); 470 n = recvfrom(d->s, buf, max_request, 0, d->sa, &d->sock_len); 471 if(n < 0) 472 krb5_warn(context, errno, "recvfrom"); 473 else { 474 addr_to_string (d->sa, d->sock_len, 475 d->addr_string, sizeof(d->addr_string)); 476 do_request(buf, n, 0, d); 477 } 478 free (buf); 479 } 480 481 static void 482 clear_descr(struct descr *d) 483 { 484 if(d->buf) 485 memset(d->buf, 0, d->size); 486 d->len = 0; 487 if(d->s != -1) 488 close(d->s); 489 d->s = -1; 490 } 491 492 493 /* remove HTTP %-quoting from buf */ 494 static int 495 de_http(char *buf) 496 { 497 char *p, *q; 498 for(p = q = buf; *p; p++, q++) { 499 if(*p == '%') { 500 unsigned int x; 501 if(sscanf(p + 1, "%2x", &x) != 1) 502 return -1; 503 *q = x; 504 p += 2; 505 } else 506 *q = *p; 507 } 508 *q = '\0'; 509 return 0; 510 } 511 512 #define TCP_TIMEOUT 4 513 514 /* 515 * accept a new TCP connection on `d[parent]' and store it in `d[child]' 516 */ 517 518 static void 519 add_new_tcp (struct descr *d, int parent, int child) 520 { 521 int s; 522 523 if (child == -1) 524 return; 525 526 d[child].sock_len = sizeof(d[child].__ss); 527 s = accept(d[parent].s, d[child].sa, &d[child].sock_len); 528 if(s < 0) { 529 krb5_warn(context, errno, "accept"); 530 return; 531 } 532 533 if (s >= FD_SETSIZE) { 534 krb5_warnx(context, "socket FD too large"); 535 close (s); 536 return; 537 } 538 539 d[child].s = s; 540 d[child].timeout = time(NULL) + TCP_TIMEOUT; 541 d[child].type = SOCK_STREAM; 542 addr_to_string (d[child].sa, d[child].sock_len, 543 d[child].addr_string, sizeof(d[child].addr_string)); 544 } 545 546 /* 547 * Grow `d' to handle at least `n'. 548 * Return != 0 if fails 549 */ 550 551 static int 552 grow_descr (struct descr *d, size_t n) 553 { 554 if (d->size - d->len < n) { 555 unsigned char *tmp; 556 557 d->size += max(1024, d->len + n); 558 if (d->size >= max_request) { 559 kdc_log(0, "Request exceeds max request size (%lu bytes).", 560 (unsigned long)d->size); 561 clear_descr(d); 562 return -1; 563 } 564 tmp = realloc (d->buf, d->size); 565 if (tmp == NULL) { 566 kdc_log(0, "Failed to re-allocate %lu bytes.", 567 (unsigned long)d->size); 568 clear_descr(d); 569 return -1; 570 } 571 d->buf = tmp; 572 } 573 return 0; 574 } 575 576 /* 577 * Try to handle the TCP data at `d->buf, d->len'. 578 * Return -1 if failed, 0 if succesful, and 1 if data is complete. 579 */ 580 581 static int 582 handle_vanilla_tcp (struct descr *d) 583 { 584 krb5_storage *sp; 585 int32_t len; 586 587 sp = krb5_storage_from_mem(d->buf, d->len); 588 if (sp == NULL) { 589 kdc_log (0, "krb5_storage_from_mem failed"); 590 return -1; 591 } 592 krb5_ret_int32(sp, &len); 593 krb5_storage_free(sp); 594 if(d->len - 4 >= len) { 595 memmove(d->buf, d->buf + 4, d->len - 4); 596 return 1; 597 } 598 return 0; 599 } 600 601 /* 602 * Try to handle the TCP/HTTP data at `d->buf, d->len'. 603 * Return -1 if failed, 0 if succesful, and 1 if data is complete. 604 */ 605 606 static int 607 handle_http_tcp (struct descr *d) 608 { 609 char *s, *p, *t; 610 void *data; 611 char *proto; 612 int len; 613 614 s = (char *)d->buf; 615 616 p = strstr(s, "\r\n"); 617 if (p == NULL) { 618 kdc_log(0, "Malformed HTTP request from %s", d->addr_string); 619 return -1; 620 } 621 *p = 0; 622 623 p = NULL; 624 t = strtok_r(s, " \t", &p); 625 if (t == NULL) { 626 kdc_log(0, "Malformed HTTP request from %s", d->addr_string); 627 return -1; 628 } 629 t = strtok_r(NULL, " \t", &p); 630 if(t == NULL) { 631 kdc_log(0, "Malformed HTTP request from %s", d->addr_string); 632 return -1; 633 } 634 data = malloc(strlen(t)); 635 if (data == NULL) { 636 kdc_log(0, "Failed to allocate %lu bytes", 637 (unsigned long)strlen(t)); 638 return -1; 639 } 640 if(*t == '/') 641 t++; 642 if(de_http(t) != 0) { 643 kdc_log(0, "Malformed HTTP request from %s", d->addr_string); 644 kdc_log(5, "Request: %s", t); 645 free(data); 646 return -1; 647 } 648 proto = strtok_r(NULL, " \t", &p); 649 if (proto == NULL) { 650 kdc_log(0, "Malformed HTTP request from %s", d->addr_string); 651 free(data); 652 return -1; 653 } 654 len = base64_decode(t, data); 655 if(len <= 0){ 656 const char *msg = 657 " 404 Not found\r\n" 658 "Server: Heimdal/" VERSION "\r\n" 659 "Content-type: text/html\r\n" 660 "Content-transfer-encoding: 8bit\r\n\r\n" 661 "<TITLE>404 Not found</TITLE>\r\n" 662 "<H1>404 Not found</H1>\r\n" 663 "That page doesn't exist, maybe you are looking for " 664 "<A HREF=\"http://www.pdc.kth.se/heimdal\">Heimdal</A>?\r\n"; 665 write(d->s, proto, strlen(proto)); 666 write(d->s, msg, strlen(msg)); 667 kdc_log(0, "HTTP request from %s is non KDC request", d->addr_string); 668 kdc_log(5, "Request: %s", t); 669 free(data); 670 return -1; 671 } 672 { 673 const char *msg = 674 " 200 OK\r\n" 675 "Server: Heimdal/" VERSION "\r\n" 676 "Content-type: application/octet-stream\r\n" 677 "Content-transfer-encoding: binary\r\n\r\n"; 678 write(d->s, proto, strlen(proto)); 679 write(d->s, msg, strlen(msg)); 680 } 681 memcpy(d->buf, data, len); 682 d->len = len; 683 free(data); 684 return 1; 685 } 686 687 /* 688 * Handle incoming data to the TCP socket in `d[index]' 689 */ 690 691 static void 692 handle_tcp(struct descr *d, int index, int min_free) 693 { 694 unsigned char buf[1024]; 695 int n; 696 int ret = 0; 697 698 if (d[index].timeout == 0) { 699 add_new_tcp (d, index, min_free); 700 return; 701 } 702 703 n = recvfrom(d[index].s, buf, sizeof(buf), 0, NULL, NULL); 704 if(n < 0){ 705 krb5_warn(context, errno, "recvfrom"); 706 return; 707 } 708 if (grow_descr (&d[index], n)) 709 return; 710 memcpy(d[index].buf + d[index].len, buf, n); 711 d[index].len += n; 712 if(d[index].len > 4 && d[index].buf[0] == 0) { 713 ret = handle_vanilla_tcp (&d[index]); 714 } else if(enable_http && 715 d[index].len >= 4 && 716 strncmp((char *)d[index].buf, "GET ", 4) == 0 && 717 strncmp((char *)d[index].buf + d[index].len - 4, 718 "\r\n\r\n", 4) == 0) { 719 ret = handle_http_tcp (&d[index]); 720 if (ret < 0) 721 clear_descr (d + index); 722 } else if (d[index].len > 4) { 723 kdc_log (0, "TCP data of strange type from %s", d[index].addr_string); 724 return; 725 } 726 if (ret < 0) 727 return; 728 else if (ret == 1) { 729 do_request(d[index].buf, d[index].len, 1, &d[index]); 730 clear_descr(d + index); 731 } 732 } 733 734 void 735 loop(void) 736 { 737 struct descr *d; 738 int ndescr; 739 740 ndescr = init_sockets(&d); 741 if(ndescr <= 0) 742 krb5_errx(context, 1, "No sockets!"); 743 while(exit_flag == 0){ 744 struct timeval tmout; 745 fd_set fds; 746 int min_free = -1; 747 int max_fd = 0; 748 int i; 749 750 FD_ZERO(&fds); 751 for(i = 0; i < ndescr; i++) { 752 if(d[i].s >= 0){ 753 if(d[i].type == SOCK_STREAM && 754 d[i].timeout && d[i].timeout < time(NULL)) { 755 kdc_log(1, "TCP-connection from %s expired after %lu bytes", 756 d[i].addr_string, (unsigned long)d[i].len); 757 clear_descr(&d[i]); 758 continue; 759 } 760 if(max_fd < d[i].s) 761 max_fd = d[i].s; 762 if (max_fd >= FD_SETSIZE) 763 krb5_errx(context, 1, "fd too large"); 764 FD_SET(d[i].s, &fds); 765 } else if(min_free < 0 || i < min_free) 766 min_free = i; 767 } 768 if(min_free == -1){ 769 struct descr *tmp; 770 tmp = realloc(d, (ndescr + 4) * sizeof(*d)); 771 if(tmp == NULL) 772 krb5_warnx(context, "No memory"); 773 else { 774 d = tmp; 775 reinit_descrs (d, ndescr); 776 memset(d + ndescr, 0, 4 * sizeof(*d)); 777 for(i = ndescr; i < ndescr + 4; i++) 778 init_descr (&d[i]); 779 min_free = ndescr; 780 ndescr += 4; 781 } 782 } 783 784 tmout.tv_sec = TCP_TIMEOUT; 785 tmout.tv_usec = 0; 786 switch(select(max_fd + 1, &fds, 0, 0, &tmout)){ 787 case 0: 788 break; 789 case -1: 790 if (errno != EINTR) 791 krb5_warn(context, errno, "select"); 792 break; 793 default: 794 for(i = 0; i < ndescr; i++) 795 if(d[i].s >= 0 && FD_ISSET(d[i].s, &fds)) { 796 if(d[i].type == SOCK_DGRAM) 797 handle_udp(&d[i]); 798 else if(d[i].type == SOCK_STREAM) 799 handle_tcp(d, i, min_free); 800 } 801 } 802 } 803 free (d); 804 } 805