1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201
|
/* hey emacs! -*- Mode: C; c-file-style: "k&r"; indent-tabs-mode: nil -*- */
/*
* tftpd.c
* main server file
*
* $Id: tftpd.c,v 1.61 2004/02/27 02:05:26 jp Exp $
*
* Copyright (c) 2000 Jean-Pierre Lefebvre <helix@step.polymtl.ca>
* and Remi Lefebvre <remi@debian.org>
*
* atftp is free software; you can redistribute them and/or modify them
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <getopt.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <pthread.h>
#include <string.h>
#include <pwd.h>
#include <grp.h>
#ifdef HAVE_WRAP
#include <tcpd.h>
#endif
#include "tftpd.h"
#include "tftp_io.h"
#include "tftp_def.h"
#include "logger.h"
#include "options.h"
#include "stats.h"
#ifdef HAVE_PCRE
#include "tftpd_pcre.h"
#endif
#ifdef HAVE_MTFTP
#include "tftpd_mtftp.h"
#endif
#undef RATE_CONTROL
/*
* Global variables set by main when starting. Read-only for threads
*/
int tftpd_max_thread = 100; /* number of concurent thread allowed */
int tftpd_timeout = 300; /* number of second of inactivity
before exiting */
char directory[MAXLEN] = "/srv/tftp/";
int retry_timeout = S_TIMEOUT;
int on = 1;
int listen_local = 0;
int tftpd_daemon = 0; /* By default we are started by inetd */
int tftpd_daemon_no_fork = 0; /* For who want a false daemon mode */
short tftpd_port = 0; /* Port atftpd listen to */
char tftpd_addr[MAXLEN] = ""; /* IP address atftpd binds to */
int tftpd_cancel = 0; /* When true, thread must exit. pthread
cancellation point are not used because
thread id are not tracked. */
char *pidfile = NULL; /* File to write own's pid */
pthread_t main_thread_id;
/*
* Multicast related. These reflect option from command line
* argument --mcast-ttl, --mcast-port and --mcast-addr
*/
int mcast_ttl = 1;
char mcast_addr[MAXLEN] = "239.255.0.0-255";
char mcast_port[MAXLEN] = "1758";
/*
* "logging level" is the maximum error level that will get logged.
* This can be increased with the -v switch.
*/
int logging_level = LOG_NOTICE;
char *log_file = NULL;
/* logging level as requested by libwrap */
#ifdef HAVE_WRAP
int allow_severity = LOG_NOTICE;
int deny_severity = LOG_NOTICE;
#endif
/* user ID and group ID when running as a daemon */
char user_name[MAXLEN] = "nobody";
char group_name[MAXLEN] = "nogroup";
/* For special uses, disable source port checking */
int source_port_checking = 1;
/* Special feature to make the server switch to new client as soon as
the current client timeout in multicast mode */
int mcast_switch_client = 0;
int trace = 0;
#ifdef HAVE_PCRE
/* Use for PCRE file name substitution */
tftpd_pcre_self_t *pcre_top = NULL;
char *pcre_file;
#endif
#ifdef HAVE_MTFTP
/* mtftp options */
struct mtftp_data *mtftp_data = NULL;
char mtftp_file[MAXLEN] = "";
int mtftp_sport = 75;
#endif
#ifdef RATE_CONTROL
int rate = 0;
#endif
/*
* We need a lock on stdin from the time we notice fresh data coming from
* stdin to the time the freshly created server thread as read it.
*/
pthread_mutex_t stdin_mutex = PTHREAD_MUTEX_INITIALIZER;
/*
* Function defined in this file
*/
void *tftpd_receive_request(void *);
void signal_handler(int signal);
int tftpd_cmd_line_options(int argc, char **argv);
void tftpd_log_options(void);
int tftpd_pid_file(char *file, int action);
void tftpd_usage(void);
/*
* Main thread. Do required initialisation and then go through a loop
* listening for client requests. When a request arrives, we allocate
* memory for a thread data structure and start a thread to serve the
* new client. If theres no activity for more than 'tftpd_timeout'
* seconds, we exit and tftpd must be respawned by inetd.
*/
int main(int argc, char **argv)
{
fd_set rfds; /* for select */
struct timeval tv; /* for select */
int run = 1; /* while (run) loop */
struct thread_data *new; /* for allocation of new thread_data */
int sockfd; /* used in daemon mode */
struct sockaddr_storage sa; /* used in daemon mode */
struct passwd *user;
struct group *group;
pthread_t tid;
#ifdef HAVE_MTFTP
pthread_t mtftp_thread;
#endif
#ifdef RATE_CONTROL
struct timeval current_time = {0, 0}; /* For rate control */
long long current = 0L;
struct timeval previous_time = {0, 0};
long long previous = 0L;
int rcvbuf; /* size of input socket buffer */
#endif
int one = 1; /* for setsockopt() */
/*
* Parse command line options. We parse before verifying
* if we are running on a tty or not to make it possible to
* verify the command line arguments
*/
if (tftpd_cmd_line_options(argc, argv) == ERR)
exit(1);
/*
* Can't be started from the prompt without explicitely specifying
* the --daemon option.
*/
if (isatty(0) && !(tftpd_daemon))
{
tftpd_usage();
exit(1);
}
/* Using syslog facilties through a wrapper. This call divert logs
* to a file as specified or to syslog if no file specified. Specifying
* /dev/stderr or /dev/stdout will work if the server is started in
* daemon mode.
*/
open_logger("atftpd", log_file, logging_level);
logger(LOG_NOTICE, "Advanced Trivial FTP server started (%s)", VERSION);
#ifdef HAVE_PCRE
/* */
if (pcre_file)
{
if ((pcre_top = tftpd_pcre_open(pcre_file)) == NULL)
logger(LOG_WARNING, "Failed to initialise PCRE, continuing anyway.");
}
#endif
#ifdef RATE_CONTROL
/* Some tuning */
rcvbuf = 128;
if (setsockopt(0, SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof(rcvbuf)) == 0)
{
logger(LOG_WARNING, "Failed to set socket option: %s", strerror(errno));
}
logger(LOG_DEBUG, "Receive socket buffer set to %d bytes", rcvbuf);
#endif
/*
* If tftpd is run in daemon mode ...
*/
if (tftpd_daemon)
{
/* daemonize here */
if (!tftpd_daemon_no_fork)
{
if (daemon(0, 0) == -1)
exit(2);
}
/* find the port; initialise sockaddr_storage structure */
if (strlen(tftpd_addr) > 0 || tftpd_port == 0)
{
struct addrinfo hints, *result;
int err;
/* look up the service and host */
memset(&hints, 0, sizeof(hints));
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_NUMERICHOST;
err = getaddrinfo(tftpd_addr, tftpd_port ? NULL : "tftp",
&hints, &result);
if (err == EAI_SERVICE)
{
logger(LOG_ERR, "atftpd: udp/tftp, unknown service");
exit(1);
}
if (err || sockaddr_set_addrinfo(&sa, result))
{
logger(LOG_ERR, "atftpd: invalid IP address %s", tftpd_addr);
exit(1);
}
if (!tftpd_port)
tftpd_port = sockaddr_get_port(&sa);
freeaddrinfo(result);
}
if (strlen(tftpd_addr) == 0)
{
memset(&sa, 0, sizeof(sa));
sa.ss_family = AF_INET;
sockaddr_set_port(&sa, tftpd_port);
}
/* open the socket */
if ((sockfd = socket(sa.ss_family, SOCK_DGRAM, 0)) == 0)
{
logger(LOG_ERR, "atftpd: can't open socket");
exit(1);
}
/* bind the socket to the desired address and port */
if (bind(sockfd, (struct sockaddr*)&sa, sizeof(sa)) < 0)
{
logger(LOG_ERR, "atftpd: can't bind port %s:%d/udp",
tftpd_addr, tftpd_port);
exit(1);
}
/*
* dup sockfd on 0 only, not 1,2 like inetd do to allow
* logging to stderr in pseudo daemon mode (--daemon --no-fork)
*/
dup2(sockfd, 0);
close(sockfd);
/* release priviliedge */
user = getpwnam(user_name);
group = getgrnam(group_name);
if (!user || !group)
{
logger(LOG_ERR,
"atftpd: can't change identity to %s.%s, exiting.",
user_name, group_name);
exit(1);
}
/* write our pid in the specified file before changing user*/
if (pidfile)
{
if (tftpd_pid_file(pidfile, 1) != OK)
exit(1);
/* to be able to remove it later */
chown(pidfile, user->pw_uid, group->gr_gid);
}
setgid(group->gr_gid);
setuid(user->pw_uid);
/* Reopen log file now that we changed user, and that we've
* open and dup2 the socket. */
open_logger("atftpd", log_file, logging_level);
}
#if defined(SOL_IP) && defined(IP_PKTINFO)
/* We need to retieve some information from incomming packets */
if (setsockopt(0, SOL_IP, IP_PKTINFO, &one, sizeof(one)) != 0)
{
logger(LOG_WARNING, "Failed to set socket option: %s", strerror(errno));
}
#endif
/* save main thread ID for proper signal handling */
main_thread_id = pthread_self();
/* Register signal handler. */
signal(SIGINT, signal_handler);
signal(SIGTERM, signal_handler);
/* print summary of options */
tftpd_log_options();
/* start collecting stats */
stats_start();
#ifdef HAVE_MTFTP
/* start mtftp server thread */
if (strlen(mtftp_file) > 0)
{
if (!tftpd_daemon)
logger(LOG_ERR, "Can't start mtftp server, use --deamon");
else
{
if ((mtftp_data = tftpd_mtftp_init(mtftp_file)) == NULL)
logger(LOG_ERR, "Failled initialise mtftp");
else
{
mtftp_data->server_port = mtftp_sport;
mtftp_data->mcast_ttl = mcast_ttl;
mtftp_data->timeout = retry_timeout;
mtftp_data->checkport = source_port_checking;
mtftp_data->trace = trace;
/* Start server thread. */
if (pthread_create(&mtftp_thread, NULL, tftpd_mtftp_server,
(void *)mtftp_data) != 0)
{
logger(LOG_ERR, "Failed to start mtftp server thread");
tftpd_mtftp_clean(mtftp_data);
mtftp_data = NULL;
}
}
}
}
#endif
/* Wait for read or write request and exit if timeout. */
while (run)
{
/*
* inetd dups the socket file descriptor to 0, 1 and 2 so we can
* use any of those as the socket fd. We use 0. stdout and stderr
* may not be used to print messages.
*/
FD_ZERO(&rfds);
FD_SET(0, &rfds);
tv.tv_sec = tftpd_timeout;
tv.tv_usec = 0;
/* We need to lock stdin, and release it when the thread
is done reading the request. */
pthread_mutex_lock(&stdin_mutex);
#ifdef RATE_CONTROL
/* if we want to implement rate control, we sleep some time here
so we cannot exceed the allowed thread/sec. */
if (rate > 0)
{
gettimeofday(¤t_time, NULL);
current = (long long)current_time.tv_sec*1000000L + current_time.tv_usec;
logger(LOG_DEBUG, "time from previous request: %Ld", current - previous);
if ((current - previous) < (60L*1000000L / (long long)rate))
{
logger(LOG_DEBUG, "will sleep for rate control (%Ld)",
(60L*1000000L / (long long)rate) - (current - previous));
usleep((60L*1000000L / (long long)rate) - (current - previous));
}
}
#endif
/* A timeout of 0 is interpreted as infinity. Wait for incomming
packets */
if (!tftpd_cancel)
{
int rv;
if ((tftpd_timeout == 0) || (tftpd_daemon))
rv = select(FD_SETSIZE, &rfds, NULL, NULL, NULL);
else
rv = select(FD_SETSIZE, &rfds, NULL, NULL, &tv);
if (rv < 0) {
logger(LOG_ERR, "%s: %d: select: %s",
__FILE__, __LINE__, strerror(errno));
/* Clear the bits, they are undefined! */
FD_ZERO(&rfds);
}
}
#ifdef RATE_CONTROL
/* get the time we receive this packet */
if (rate > 0)
{
gettimeofday(&previous_time, NULL);
previous = (long long)previous_time.tv_sec*1000000L +
previous_time.tv_usec;
}
#endif
if (FD_ISSET(0, &rfds) && (!tftpd_cancel))
{
/* Allocate memory for thread_data structure. */
if ((new = calloc(1, sizeof(struct thread_data))) == NULL)
{
logger(LOG_ERR, "%s: %d: Memory allocation failed",
__FILE__, __LINE__);
exit(1);
}
/*
* Initialisation of thread_data structure.
*/
pthread_mutex_init(&new->client_mutex, NULL);
new->sockfd = 0;
/* Allocate data buffer for tftp transfer. */
if ((new->data_buffer = malloc((size_t)SEGSIZE + 4)) == NULL)
{
logger(LOG_ERR, "%s: %d: Memory allocation failed",
__FILE__, __LINE__);
exit(1);
}
new->data_buffer_size = SEGSIZE + 4;
/* Allocate memory for tftp option structure. */
if ((new->tftp_options =
malloc(sizeof(tftp_default_options))) == NULL)
{
logger(LOG_ERR, "%s: %d: Memory allocation failed",
__FILE__, __LINE__);
exit(1);
}
/* Copy default options. */
memcpy(new->tftp_options, tftp_default_options,
sizeof(tftp_default_options));
/* default timeout */
new->timeout = retry_timeout;
/* wheter we check source port or not */
new->checkport = source_port_checking;
/* other options */
new->mcast_switch_client = mcast_switch_client;
new->trace = trace;
/* default ttl for multicast */
new->mcast_ttl = mcast_ttl;
/* Allocate memory for a client structure. */
if ((new->client_info =
calloc(1, sizeof(struct client_info))) == NULL)
{
logger(LOG_ERR, "%s: %d: Memory allocation failed",
__FILE__, __LINE__);
exit(1);
}
new->client_info->done = 0;
new->client_info->next = NULL;
/* Start a new server thread. */
if (pthread_create(&tid, NULL, tftpd_receive_request,
(void *)new) != 0)
{
logger(LOG_ERR, "Failed to start new thread");
free(new);
pthread_mutex_unlock(&stdin_mutex);
}
}
else
{
pthread_mutex_unlock(&stdin_mutex);
/* Either select return after timeout of we've been killed. In the first case
we wait for server thread to finish, in the other we kill them */
if (tftpd_cancel)
tftpd_list_kill_threads();
while (tftpd_list_num_of_thread() != 0)
sleep(1);
run = 0;
if (tftpd_daemon || (tftpd_timeout == 0))
logger(LOG_NOTICE, "atftpd terminating");
else
logger(LOG_NOTICE,
"atftpd terminating after %d seconds",
tftpd_timeout);
}
}
/* close all open file descriptors */
close(0);
close(1);
close(2);
#ifdef HAVE_MTFTP
/* stop the mtftp threads */
if (mtftp_data)
{
/* kill mtftp serving thread */
tftpd_mtftp_kill_threads(mtftp_data);
/* kill mtftp main thread */
pthread_kill(mtftp_thread, SIGTERM);
pthread_join(mtftp_thread, NULL);
}
#endif
/* stop collecting stats and print them*/
stats_end();
stats_print();
#ifdef HAVE_PCRE
/* remove allocated memory for tftpd_pcre */
if (pcre_top)
tftpd_pcre_close(pcre_top);
#endif
/* some cleaning */
if (log_file)
free(log_file);
#ifdef HAVE_PCRE
if (pcre_file)
free(pcre_file);
#endif
/* remove PID file */
if (pidfile)
tftpd_pid_file(pidfile, 0);
logger(LOG_NOTICE, "Main thread exiting");
close_logger();
exit(0);
}
/*
* This function handles the initial connection with a client. It reads
* the request from stdin and then release the stdin_mutex, so the main
* thread may listen for new clients. After that, we process options and
* call the sending or receiving function.
*
* arg is a thread_data structure pointer for that thread.
*/
void *tftpd_receive_request(void *arg)
{
struct thread_data *data = (struct thread_data *)arg;
int retval; /* hold return value for testing */
int data_size; /* returned size by recvfrom */
char string[MAXLEN]; /* hold the string we pass to the logger */
int num_of_threads;
int abort = 0; /* 1 if we need to abort because the maximum
number of threads have been reached*/
struct sockaddr_storage to; /* destination of client's packet */
socklen_t len = sizeof(to);
char addr_str[SOCKADDR_PRINT_ADDR_LEN];
/* Detach ourself. That way the main thread does not have to
* wait for us with pthread_join. */
data->tid = pthread_self();
pthread_detach(data->tid);
/* Read the first packet from stdin. */
data_size = data->data_buffer_size;
retval = tftp_get_packet(0, -1, NULL, &data->client_info->client, NULL,
&to, data->timeout, &data_size,
data->data_buffer);
/* now unlock stdin */
pthread_mutex_unlock(&stdin_mutex);
/* Verify the number of threads */
if ((num_of_threads = tftpd_list_num_of_thread()) >= tftpd_max_thread)
{
logger(LOG_INFO, "Maximum number of threads reached: %d",
num_of_threads);
abort = 1;
}
#ifdef HAVE_WRAP
if (!abort)
{
/* Verify the client has access. We don't look for the name but
rely only on the IP address for that. */
sockaddr_print_addr(&data->client_info->client,
addr_str, sizeof(addr_str));
if (hosts_ctl("in.tftpd", STRING_UNKNOWN, addr_str,
STRING_UNKNOWN) == 0)
{
logger(LOG_ERR, "Connection refused from %s", addr_str);
abort = 1;
}
}
#endif
/* Add this new thread structure to the list. */
if (!abort)
stats_new_thread(tftpd_list_add(data));
/* if the maximum number of thread is reached, too bad we abort. */
if (abort)
stats_abort_locked();
else
{
/* open a socket for client communication */
data->sockfd = socket(data->client_info->client.ss_family,
SOCK_DGRAM, 0);
memset(&to, 0, sizeof(to));
to.ss_family = data->client_info->client.ss_family;
/* Force socket to listen on local address. Do not listen on broadcast address 255.255.255.255.
If the socket listens on the broadcast address, Linux tells the remote client the port
is unreachable. This happens even if SO_BROADCAST is set in setsockopt for this socket.
I was unable to find a kernel option or /proc/sys flag to make the kernel pay attention to
these requests, so the workaround is to force listening on the local address. */
if (listen_local == 1)
{
logger(LOG_INFO, "forcing socket to listen on local address");
if (setsockopt(data->sockfd, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) != 0) {
logger(LOG_ERR, "setsockopt: %s", strerror(errno));
}
}
else
{
logger(LOG_INFO, "socket may listen on any address, including broadcast");
}
if (data->sockfd > 0)
{
/* bind the socket to the interface */
if (bind(data->sockfd, (struct sockaddr *)&to, len) == -1)
{
logger(LOG_ERR, "bind: %s", strerror(errno));
retval = ABORT;
}
/* read back assigned port */
len = sizeof(to);
if (getsockname(data->sockfd, (struct sockaddr *)&to, &len) == -1)
{
logger(LOG_ERR, "getsockname: %s", strerror(errno));
retval = ABORT;
}
/* connect the socket, faster for kernel operation */
if (connect(data->sockfd,
(struct sockaddr *)&data->client_info->client,
sizeof(data->client_info->client)) == -1)
{
logger(LOG_ERR, "connect: %s", strerror(errno));
retval = ABORT;
}
logger(LOG_DEBUG, "Creating new socket: %s:%d",
sockaddr_print_addr(&to, addr_str, sizeof(addr_str)),
sockaddr_get_port(&to));
/* read options from request */
opt_parse_request(data->data_buffer, data_size,
data->tftp_options);
opt_request_to_string(data->tftp_options, string, MAXLEN);
}
else
{
retval = ABORT;
}
/* Analyse the request. */
switch (retval)
{
case GET_RRQ:
logger(LOG_NOTICE, "Serving %s to %s:%d",
data->tftp_options[OPT_FILENAME].value,
sockaddr_print_addr(&data->client_info->client,
addr_str, sizeof(addr_str)),
sockaddr_get_port(&data->client_info->client));
if (data->trace)
logger(LOG_DEBUG, "received RRQ <%s>", string);
if (tftpd_send_file(data) == OK)
stats_send_locked();
else
stats_err_locked();
break;
case GET_WRQ:
logger(LOG_NOTICE, "Fetching from %s to %s",
sockaddr_print_addr(&data->client_info->client,
addr_str, sizeof(addr_str)),
data->tftp_options[OPT_FILENAME].value);
if (data->trace)
logger(LOG_DEBUG, "received WRQ <%s>", string);
if (tftpd_receive_file(data) == OK)
stats_recv_locked();
else
stats_err_locked();
break;
case ERR:
logger(LOG_ERR, "Error from tftp_get_packet");
tftp_send_error(data->sockfd, &data->client_info->client,
EUNDEF, data->data_buffer, data->data_buffer_size);
if (data->trace)
logger(LOG_DEBUG, "sent ERROR <code: %d, msg: %s>", EUNDEF,
tftp_errmsg[EUNDEF]);
stats_err_locked();
break;
case ABORT:
if (data->trace)
logger(LOG_ERR, "thread aborting");
stats_err_locked();
break;
default:
logger(LOG_NOTICE, "Invalid request <%d> from %s",
retval,
sockaddr_print_addr(&data->client_info->client,
addr_str, sizeof(addr_str)));
tftp_send_error(data->sockfd, &data->client_info->client,
EBADOP, data->data_buffer, data->data_buffer_size);
if (data->trace)
logger(LOG_DEBUG, "sent ERROR <code: %d, msg: %s>", EBADOP,
tftp_errmsg[EBADOP]);
stats_err_locked();
}
}
/* make sure all data is sent to the network */
if (data->sockfd)
{
fsync(data->sockfd);
close(data->sockfd);
}
/* update stats */
stats_thread_usage_locked();
/* Remove the thread_data structure from the list, if it as been
added. */
if (!abort)
tftpd_list_remove(data);
/* Free memory. */
if (data->data_buffer)
free(data->data_buffer);
free(data->tftp_options);
/* if the thread had reserverd a multicast IP/Port, deallocate it */
if (data->mc_port != 0)
tftpd_mcast_free_tid(data->mc_addr, data->mc_port);
/* this function take care of freeing allocated memory by other threads */
tftpd_clientlist_free(data);
/* free the thread structure */
free(data);
logger(LOG_INFO, "Server thread exiting");
pthread_exit(NULL);
}
/*
* If we receive signals, we must exit in a clean way. This means
* sending an ERROR packet to all clients to terminate the connection.
*/
void signal_handler(int signal)
{
/* Any thread may receive the signal, always make sure the main thread receive it
and cancel other threads itself. However, if tftpd_cancel already set, just
ignore the signal since the master thread as already got the signal. */
if (pthread_self() != main_thread_id)
{
if (tftpd_cancel == 0)
{
logger(LOG_ERR, "Forwarding signal to main thread");
pthread_kill(main_thread_id, signal);
}
return;
}
/* Only signals for the main thread get there */
switch (signal)
{
case SIGINT:
logger(LOG_ERR, "SIGINT received, stopping threads and exiting.");
tftpd_cancel = 1;
break;
case SIGTERM:
logger(LOG_ERR, "SIGTERM received, stopping threads and exiting.");
tftpd_cancel = 1;
break;
default:
logger(LOG_WARNING, "Signal %d received, ignoring.", signal);
break;
}
}
#define OPT_RATE 'R'
#define OPT_MCAST_TTL '0'
#define OPT_MCAST_ADDR '1'
#define OPT_MCAST_PORT '2'
#define OPT_PCRE '3'
#define OPT_PCRE_TEST '4'
#define OPT_PORT_CHECK '5'
#define OPT_MCAST_SWITCH '6'
#define OPT_MTFTP '7'
#define OPT_MTFTP_PORT '8'
#define OPT_TRACE '9'
/*
* Parse the command line using the standard getopt function.
*/
int tftpd_cmd_line_options(int argc, char **argv)
{
int c;
char *tmp;
#ifdef HAVE_PCRE
char string[MAXLEN], out[MAXLEN];
#endif
static struct option options[] = {
{ "tftpd-timeout", 1, NULL, 't' },
{ "retry-timeout", 1, NULL, 'r' },
{ "maxthread", 1, NULL, 'm' },
#ifdef RATE_CONTROL
{ "rate", 1, NULL, OPT_RATE },
#endif
{ "verbose", 2, NULL, 'v' },
{ "trace", 0, NULL, OPT_TRACE },
{ "no-timeout", 0, NULL, 'T' },
{ "no-tsize", 0, NULL, 'S' },
{ "no-blksize", 0, NULL, 'B' },
{ "no-multicast", 0, NULL, 'M' },
{ "logfile", 1, NULL, 'L' },
{ "pidfile", 1, NULL, 'I'},
{ "listen-local", 0, NULL, 'F'},
{ "daemon", 0, NULL, 'D' },
{ "no-fork", 0, NULL, 'N'},
{ "user", 1, NULL, 'U'},
{ "group", 1, NULL, 'G'},
{ "port", 1, NULL, 'P' },
{ "bind-address", 1, NULL, 'A'},
{ "mcast-ttl", 1, NULL, OPT_MCAST_TTL },
{ "mcast_ttl", 1, NULL, OPT_MCAST_TTL },
{ "mcast-addr", 1, NULL, OPT_MCAST_ADDR },
{ "mcast_addr", 1, NULL, OPT_MCAST_ADDR },
{ "mcast-port", 1, NULL, OPT_MCAST_PORT },
{ "mcast_port", 1, NULL, OPT_MCAST_PORT },
#ifdef HAVE_PCRE
{ "pcre", 1, NULL, OPT_PCRE },
{ "pcre-test", 1, NULL, OPT_PCRE_TEST },
#endif
#ifdef HAVE_MTFTP
{ "mtftp", 1, NULL, OPT_MTFTP },
{ "mtftp-port", 1, NULL, OPT_MTFTP_PORT },
#endif
{ "no-source-port-checking", 0, NULL, OPT_PORT_CHECK },
{ "mcast-switch-client", 0, NULL, OPT_MCAST_SWITCH },
{ "version", 0, NULL, 'V' },
{ "help", 0, NULL, 'h' },
{ 0, 0, 0, 0 }
};
while ((c = getopt_long(argc, argv, "t:r:m:v::Vh",
options, NULL)) != EOF)
{
switch (c)
{
case 't':
tftpd_timeout = atoi(optarg);
break;
case 'r':
retry_timeout = atoi(optarg);
break;
case 'm':
tftpd_max_thread = atoi(optarg);
break;
#ifdef RATE_CONTROL
case OPT_RATE:
rate = atoi(optarg);
break;
#endif
case 'v':
if (optarg)
logging_level = atoi(optarg);
else
logging_level++;
#ifdef HAVE_WRAP
allow_severity = logging_level;
deny_severity = logging_level;
#endif
break;
case OPT_TRACE:
trace = 1;
break;
case 'T':
tftp_default_options[OPT_TIMEOUT].enabled = 0;
break;
case 'S':
tftp_default_options[OPT_TSIZE].enabled = 0;
break;
case 'B':
tftp_default_options[OPT_BLKSIZE].enabled = 0;
break;
case 'M':
tftp_default_options[OPT_MULTICAST].enabled = 0;
break;
case 'L':
log_file = strdup(optarg);
break;
case 'I':
pidfile = strdup(optarg);
break;
case 'F':
listen_local = 1;
break;
case 'D':
tftpd_daemon = 1;
break;
case 'N':
tftpd_daemon_no_fork = 1;
break;
case 'U':
tmp = strtok(optarg, ".");
if (tmp != NULL)
Strncpy(user_name, tmp, MAXLEN);
tmp = strtok(NULL, "");
if (tmp != NULL)
Strncpy(group_name, optarg, MAXLEN);
break;
case 'G':
Strncpy(group_name, optarg, MAXLEN);
break;
case 'P':
tftpd_port = (short)atoi(optarg);
break;
case 'A':
Strncpy(tftpd_addr, optarg, MAXLEN);
break;
case OPT_MCAST_TTL:
mcast_ttl = atoi(optarg);
break;
case OPT_MCAST_ADDR:
Strncpy(mcast_addr, optarg, MAXLEN);
break;
case '2':
Strncpy(mcast_port, optarg, MAXLEN);
break;
#ifdef HAVE_PCRE
case OPT_PCRE:
pcre_file = strdup(optarg);
break;
case OPT_PCRE_TEST:
/* test the pattern file */
if ((pcre_top = tftpd_pcre_open(optarg)) == NULL)
{
fprintf(stderr, "Failed to initialise PCRE with file %s", optarg);
exit(1);
}
/* run test */
while (1)
{
if (isatty(0))
printf("> ");
if (fgets(string, MAXLEN, stdin) == NULL)
{
tftpd_pcre_close(pcre_top);
exit(0);
}
/* exit on empty line */
if (string[0] == '\n')
{
tftpd_pcre_close(pcre_top);
exit(0);
}
/* remove \n from input */
string[strlen(string) - 1] = '\0';
/* do the substitution */
if (tftpd_pcre_sub(pcre_top, out, MAXLEN, string) < 0)
printf("Substitution: \"%s\" -> \"\"\n", string);
else
printf("Substitution: \"%s\" -> \"%s\"\n", string, out);
}
#endif
case OPT_PORT_CHECK:
source_port_checking = 0;
break;
case OPT_MCAST_SWITCH:
mcast_switch_client = 1;
break;
#ifdef HAVE_MTFTP
case OPT_MTFTP:
Strncpy(mtftp_file, optarg, MAXLEN);
break;
case OPT_MTFTP_PORT:
mtftp_sport = atoi(optarg);
break;
#endif
case 'V':
printf("atftp-%s (server)\n", VERSION);
exit(0);
case 'h':
tftpd_usage();
exit(0);
case '?':
exit(1);
break;
}
}
/* verify that only one arguement is left */
if (optind < argc)
Strncpy(directory, argv[optind], MAXLEN);
/* make sure the last caracter is a / */
if (directory[strlen(directory)] != '/')
strcat(directory, "/");
/* build multicast address/port range */
if (tftpd_mcast_parse_opt(mcast_addr, mcast_port) != OK)
exit(1);
return OK;
}
/*
* Output option to the syslog.
*/
void tftpd_log_options(void)
{
if (tftpd_daemon == 1)
{
logger(LOG_INFO, " running in daemon mode on port %d", tftpd_port);
if (strlen(tftpd_addr) > 0)
logger(LOG_INFO, " bound to IP address %s only", tftpd_addr);
}
else
logger(LOG_INFO, " started by inetd");
logger(LOG_INFO, " logging level: %d", logging_level);
if (trace)
logger(LOG_INFO, " trace enabled");
logger(LOG_INFO, " directory: %s", directory);
logger(LOG_INFO, " user: %s.%s", user_name, group_name);
logger(LOG_INFO, " log file: %s", (log_file==NULL) ? "syslog":log_file);
if (pidfile)
logger(LOG_INFO, " pid file: %s", pidfile);
if (listen_local == 1)
logger(LOG_INFO, " forcing to listen on local interfaces: on.");
else
logger(LOG_INFO, " not forcing to listen on local interfaces.");
if (tftpd_daemon == 1)
logger(LOG_INFO, " server timeout: Not used");
else
logger(LOG_INFO, " server timeout: %d", tftpd_timeout);
logger(LOG_INFO, " tftp retry timeout: %d", retry_timeout);
logger(LOG_INFO, " maximum number of thread: %d", tftpd_max_thread);
#ifdef RATE_CONTROL
if (rate > 0)
logger(LOG_INFO, " request per minute limit: %d", rate);
else
logger(LOG_INFO, " request per minute limit: ---");
#endif
logger(LOG_INFO, " option timeout: %s",
tftp_default_options[OPT_TIMEOUT].enabled ? "enabled":"disabled");
logger(LOG_INFO, " option tzise: %s",
tftp_default_options[OPT_TSIZE].enabled ? "enabled":"disabled");
logger(LOG_INFO, " option blksize: %s",
tftp_default_options[OPT_BLKSIZE].enabled ? "enabled":"disabled");
logger(LOG_INFO, " option multicast: %s",
tftp_default_options[OPT_MULTICAST].enabled ? "enabled":"disabled");
logger(LOG_INFO, " address range: %s", mcast_addr);
logger(LOG_INFO, " port range: %s", mcast_port);
#ifdef HAVE_PCRE
if (pcre_top)
logger(LOG_INFO, " PCRE: using file: %s", pcre_file);
#endif
#ifdef HAVE_MTFTP
if (strcmp(mtftp_file, "") != 0)
{
logger(LOG_INFO, " mtftp: using file: %s", mtftp_file);
logger(LOG_INFO, " mtftp: listenning on port %d", mtftp_sport);
}
#endif
if (mcast_switch_client)
logger(LOG_INFO, " --mcast-switch-client turned on");
if (!source_port_checking)
logger(LOG_INFO, " --no-source-port-checking turned on");
}
/*
*
*/
int tftpd_pid_file(char *file, int action)
{
FILE *fp;
pid_t pid;
if (action)
{
/* check if file exist */
if ((fp = fopen(file, "r")) != NULL)
{
logger(LOG_NOTICE, "pid file already exist, overwriting");
fclose(fp);
}
/* open file for writing */
if ((fp = fopen(file, "w")) == NULL)
{
logger(LOG_ERR, "error writing PID to file %s\n", file);
return ERR;
}
/* write it */
pid = getpid();
fprintf(fp, "%d\n", pid);
fclose(fp);
return OK;
}
else
{
/* unlink the pid file */
if (unlink(file) == -1)
logger(LOG_ERR, "unlink: %s", strerror(errno));
return OK;
}
}
/*
* Show a nice usage...
*/
void tftpd_usage(void)
{
printf("Usage: tftpd [options] [directory]\n"
" [options] may be:\n"
" -t, --tftpd-timeout <value>: number of second of inactivity"
" before exiting\n"
" -r, --retry-timeout <value>: time to wait a reply before"
" retransmition\n"
" -m, --maxthread <value> : number of concurrent thread"
" allowed\n"
#ifdef RATE_CONTROL
" --rate <value> : number of request per minute limit\n"
#endif
" -v, --verbose [value] : increase or set the level of"
" output messages\n"
" --trace : log all sent and received packets\n"
" --no-timeout : disable 'timeout' from RFC2349\n"
" --no-tsize : disable 'tsize' from RFC2349\n"
" --no-blksize : disable 'blksize' from RFC2348\n"
" --no-multicast : disable 'multicast' from RFC2090\n"
" --logfile <file> : logfile to log logs to ;-)\n"
" --pidfile <file> : write PID to this file\n"
" --listen-local : force listen on local network address\n"
" --daemon : run atftpd standalone (no inetd)\n"
" --no-fork : run as a daemon, don't fork\n"
" --user <user[.group]> : default is nobody\n"
" --group <group> : default is nogroup\n"
" --port <port> : port on which atftp listen\n"
" --bind-address <IP> : local address atftpd listen to\n"
" --mcast-ttl : ttl to used for multicast\n"
" --mcast-addr <address list>: list/range of IP address to use\n"
" --mcast-port <port range> : ports to use for multicast"
" transfer\n"
#ifdef HAVE_PCRE
" --pcre <file> : use this file for pattern replacement\n"
" --pcre-test <file> : just test pattern file, not starting server\n"
#endif
#ifdef HAVE_MTFTP
" --mtftp <file> : mtftp configuration file\n"
" --mtftp-port <port> : port mtftp will listen\n"
#endif
" --no-source-port-checking : violate RFC, see man page\n"
" --mcast-switch-client : switch client on first timeout, see man page\n"
" -V, --version : print version information\n"
" -h, --help : print this help\n"
"\n"
" [directory] must be a world readable/writable directories.\n"
" By default /tftpboot is assumed."
"\n");
}
|