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
|
/*------------------------------------------------------------------
* simple_server_windows.c -
* This is a very simple Windows API
* multi-threaded TCP server used by the
* example EST server and EST proxy
* applications when built on Windows.
*
* April, 2016
*
* Copyright (c) 2016 by cisco Systems, Inc.
* All rights reserved.
**------------------------------------------------------------------
*/
#include <stdio.h>
#include <WS2tcpip.h>
#include <fcntl.h>
#include <sys/types.h>
#include <est.h>
#include <signal.h>
#include <stdint.h>
#pragma comment(lib, "Ws2_32.lib")
#define NON_BLOCKING_SOCKET 1
volatile int stop_flag = 0;
int sock;
static int tcp_port = 8085;
static int family = AF_INET;
volatile int num_threads;
static EST_CTX *ctx;
CONDITION_VARIABLE cond;
CONDITION_VARIABLE BufferNotEmpty;
CONDITION_VARIABLE BufferNotFull;
CRITICAL_SECTION BufferLock;
int queue[20];
volatile int head;
volatile int tail;
#define SLEEP(x) Sleep(x*1000)
#define close(socket) closesocket(socket)
#define snprintf _snprintf
#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
#define NUM_WORKER_THREADS 5
static int grab_work (int *sp)
{
EnterCriticalSection(&BufferLock);
// Check for new work
while (head == tail && stop_flag == 0) {
SleepConditionVariableCS(&BufferNotEmpty, &BufferLock, INFINITE);
}
if (head > tail) {
*sp = queue[tail % ARRAY_SIZE(queue)];
tail++;
// Keep our pointers aligned
while (tail > (int) ARRAY_SIZE(queue)) {
tail -= ARRAY_SIZE(queue);
head -= ARRAY_SIZE(queue);
}
}
WakeConditionVariable(&BufferNotFull);
LeaveCriticalSection(&BufferLock);
return !stop_flag;
}
DWORD WINAPI worker_thread (void* args)
{
int sock = 0;
while (grab_work(&sock)) {
/*
* Both SERVER and PROXY modes use the
* same entry point to hand off the socket
* to libest
*/
est_server_handle_request(ctx, sock);
close(sock);
}
// Tell the boss that we're finishing
EnterCriticalSection(&BufferLock);
num_threads--;
WakeConditionVariable(&cond);
LeaveCriticalSection(&BufferLock);
return 0;
}
static void process_socket (int fd)
{
EnterCriticalSection(&BufferLock);
// Check if work queue is full and wait
while (stop_flag == 0 && head - tail >= (int) ARRAY_SIZE(queue)) {
SleepConditionVariableCS(&BufferNotFull, &BufferLock, INFINITE);
}
if (head - tail < (int) ARRAY_SIZE(queue)) {
// Put the accepted socket on to the work queue
queue[head % ARRAY_SIZE(queue)] = fd;
head++;
}
WakeConditionVariable(&BufferNotEmpty);
LeaveCriticalSection(&BufferLock);
}
static DWORD WINAPI master_thread_v4(LPVOID lpParam)
{
int sock;
struct sockaddr_in addr;
int on = 1;
int rc;
int new;
int unsigned len;
u_long iMode = NON_BLOCKING_SOCKET;
memset(&addr, 0x0, sizeof(struct sockaddr_in));
addr.sin_family = AF_INET;
addr.sin_port = htons(tcp_port);
sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sock == -1) {
fprintf(stderr, "\nsocket call failed\n");
exit(1);
}
// Needs to be done to bind to both :: and 0.0.0.0 to the same port
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char*)&on, sizeof(on));
setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (char*)&on, sizeof(on));
/*
Replace POSIX code with Windows equivalent for setting non-blocking socket
*/
ioctlsocket(sock, FIONBIO, &iMode);
rc = bind(sock, (const struct sockaddr*)&addr, sizeof(addr));
if (rc == -1) {
fprintf(stderr, "\nbind call failed\n");
exit(1);
}
listen(sock, SOMAXCONN);
stop_flag = 0;
while (stop_flag == 0) {
len = sizeof(addr);
new = accept(sock, (struct sockaddr*)&addr, &len);
if (new < 0) {
/*
* this is a bit cheesy, but much easier to implement than using select()
*/
SLEEP(1);
}
else {
if (stop_flag == 0) {
est_server_handle_request(ctx, new);
close(new);
}
}
}
close(sock);
return 0;
}
static DWORD WINAPI master_thread_v6 (LPVOID lpParam)
{
int sock;
struct sockaddr_in6 addr;
int on = 1;
int rc;
int new;
int unsigned len;
u_long iMode = NON_BLOCKING_SOCKET;
memset(&addr, 0x0, sizeof(struct sockaddr_in6));
addr.sin6_family = AF_INET6;
addr.sin6_port = htons((uint16_t)tcp_port);
sock = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
if (sock == -1) {
fprintf(stderr, "\nsocket call failed\n");
exit(1);
}
// Needs to be done to bind to both :: and 0.0.0.0 to the same port
int no = 0;
setsockopt(sock, SOL_SOCKET, IPV6_V6ONLY, (void *)&no, sizeof(no));
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char*)&on, sizeof(on));
setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (char*)&on, sizeof(on));
/*
Replace POSIX code with Windows equivalent for setting non-blocking socket
*/
ioctlsocket(sock, FIONBIO, &iMode);
rc = bind(sock, (const struct sockaddr*)&addr, sizeof(addr));
if (rc == -1) {
fprintf(stderr, "\nbind call failed\n");
exit(1);
}
listen(sock, SOMAXCONN);
stop_flag = 0;
while (stop_flag == 0) {
len = sizeof(addr);
new = accept(sock, (struct sockaddr*)&addr, &len);
if (new < 0) {
/*
* this is a bit cheesy, but much easier to implement than using select()
*/
SLEEP(1);
}
else {
if (stop_flag == 0) {
est_server_handle_request(ctx, new);
close(new);
}
}
}
close(sock);
return 0;
}
#if 0
DWORD WINAPI master_thread (void *arg)
{
struct addrinfo hints, *ai, *aiptr;
char portstr[12];
int on = 1;
int rc;
int new;
u_long iMode = NON_BLOCKING_SOCKET;
/*
* Lookup the local address we'll use to bind too
*/
memset(&hints, '\0', sizeof(struct addrinfo));
hints.ai_family = family;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
snprintf(portstr, sizeof(portstr), "%u", tcp_port);
rc = getaddrinfo(NULL, portstr, &hints, &aiptr);
if (rc) {
printf("\ngetaddrinfo call failed\n");
printf("getaddrinfo(): %s\n", gai_strerror(rc));
exit(1);
}
for (ai = aiptr; ai; ai = ai->ai_next) {
sock = socket(family, SOCK_STREAM, IPPROTO_TCP);
if (sock == -1) {
/* If we can't create a socket using this address, then
* try the next address */
continue;
}
/*
* Set some socket options for our server
*/
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char*) &on,
sizeof(on))) {
printf("\nsetsockopt REUSEADDR call failed\n");
exit(1);
}
if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (char*) &on,
sizeof(on))) {
printf("\nsetsockopt KEEPALIAVE call failed\n");
exit(1);
}
ioctlsocket(sock, FIONBIO, &iMode);
/*
* Bind to the socket
*/
rc = bind(sock, ai->ai_addr, ai->ai_addrlen);
if (rc == -1) {
printf("\nbind call failed\n");
exit(1);
}
break;
}
if (ai) {
listen(sock, SOMAXCONN);
} else {
printf("\nNo address info found\n");
exit(1);
}
while (stop_flag == 0) {
new = accept(sock, NULL, NULL);
if (new < 0) {
if (stop_flag != 0) {
break;
}
/*
* this is a bit cheesy, but much easier to implement than using select()
*/
SLEEP(1);
} else {
if (stop_flag == 0) {
process_socket(new);
}
}
}
close(sock);
freeaddrinfo(aiptr);
// Notify all the workers that it's time to shutdown
WakeAllConditionVariable(&BufferNotEmpty);
// Wait for the workers to finish
EnterCriticalSection(&BufferLock);
while (num_threads > 0) {
SleepConditionVariableCS(&cond, &BufferLock, INFINITE);
}
LeaveCriticalSection(&BufferLock);
DeleteCriticalSection(&BufferLock);
stop_flag = 2;
return 0;
}
#endif
static HANDLE start_thread (LPTHREAD_START_ROUTINE func)
{
DWORD mThreadID;
return CreateThread(NULL, 0, func, NULL, 0, &mThreadID);
}
static void catch_int (int signo)
{
stop_flag = 1;
}
/*
* This is the entry point into the Simple TCP server.
* This is designed to work with either the EST server
* or EST proxy example applications. This creates
* a multi-threaded TCP server. It opens a socket,
* waits for incoming connections on the socket,
* and dispatches work to a separate thread to process
* the incoming EST request.
*
* Parameters:
* ectx Pointer to the EST_CTX that was provided from
* calling est_server_init().
* port The TCP port to listen too.
* delay The number of seconds to wait before
* automatically shutting down the server.
* Pass in 0 to run until keyboard input is
* detected.
* v6 Set to non-zero value to enable IPv6
*/
void start_simple_server (EST_CTX *ectx, int port, int delay, int v6)
{
int i;
/*
* Save a global reference to the context.
* This code only supports running a single
* instance of the server.
*/
ctx = ectx;
tcp_port = port;
if (v6) {
family = AF_INET6;
}
/*
* Install handler to catch ctrl-C to stop the process gracefully
*/
signal(SIGINT, catch_int);
InitializeCriticalSection(&BufferLock);
InitializeConditionVariable(&cond);
InitializeConditionVariable(&BufferNotEmpty);
InitializeConditionVariable(&BufferNotFull);
// Start master (listening) thread
if (v6) {
start_thread(master_thread_v6);
} else {
start_thread(master_thread_v4);
}
// Start worker threads
for (i = 0; i < NUM_WORKER_THREADS; i++) {
if (start_thread(worker_thread) == NULL) {
printf("\nCannot start worker thread\n");
} else {
EnterCriticalSection(&BufferLock);
num_threads++;
LeaveCriticalSection(&BufferLock);
}
}
if (delay > 0) {
/* We will automatically shut down the server
* after <delay> seconds */
SLEEP(delay);
stop_flag = 1;
}
while (!stop_flag) {
SLEEP(1);
}
}
|