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/*------------------------------------------------------------------
* simple_server.c - This is a very simple multi-threaded TCP
* server used by the example EST server and EST
* proxy applications.
*
* August, 2013
*
* Copyright (c) 2013-2014, 2016 by cisco Systems, Inc.
* All rights reserved.
**------------------------------------------------------------------
*/
#include <stdio.h>
#include <unistd.h>
#ifndef DISABLE_PTHREADS
#include <pthread.h>
#endif
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <est.h>
#include <signal.h>
volatile int stop_flag = 0;
int sock;
#ifdef HAVE_LIBCOAP
static int udp_port;
#endif
extern int coap_mode;
static int tcp_port;
static int family = AF_INET;
volatile int num_threads;
static EST_CTX *ctx;
#ifndef DISABLE_PTHREADS
pthread_mutex_t mutex;
pthread_cond_t cond;
int queue[20];
volatile int head;
volatile int tail;
pthread_cond_t full;
pthread_cond_t empty;
typedef void * (*thread_func_t)(void *);
#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
#if HAVE_LIBCOAP
#define NUM_WORKER_THREADS 1
#else
#define NUM_WORKER_THREADS 5
#endif
static int grab_work (int *sp)
{
pthread_mutex_lock(&mutex);
// Check for new work
while (head == tail && stop_flag == 0) {
pthread_cond_wait(&full, &mutex);
}
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);
}
}
pthread_cond_signal(&empty);
pthread_mutex_unlock(&mutex);
return !stop_flag;
}
static void * worker_thread (void* data)
{
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
pthread_mutex_lock(&mutex);
num_threads--;
pthread_cond_signal(&cond);
pthread_mutex_unlock(&mutex);
return NULL;
}
static void process_socket (int fd)
{
pthread_mutex_lock(&mutex);
// Check if work queue is full and wait
while (stop_flag == 0 && head - tail >= (int)ARRAY_SIZE(queue)) {
pthread_cond_wait(&empty, &mutex);
}
if (head - tail < (int)ARRAY_SIZE(queue)) {
// Put the accepted socket on to the work queue
queue[head % ARRAY_SIZE(queue)] = fd;
head++;
}
pthread_cond_signal(&full);
pthread_mutex_unlock(&mutex);
}
#else
static void process_socket (int fd)
{
est_server_handle_request(ctx, fd);
close(fd);
}
#endif
static void * master_thread (void *data)
{
struct addrinfo hints, *ai, *aiptr;
char portstr[12];
int on = 1;
int rc;
struct sockaddr *addr;
int flags;
int new;
int unsigned len;
#if (HAVE_LIBCOAP)
int processing_error = 0;
#endif
if (coap_mode == 0){
/*
* 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);
}
flags = fcntl(sock, F_GETFL, 0);
if (fcntl(sock, F_SETFL, flags | O_NONBLOCK)) {
printf("\nfcntl SETFL call failed\n");
exit(1);
}
/*
* 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) {
addr = ai->ai_addr;
listen(sock, SOMAXCONN);
} else {
printf("\nNo address info found\n");
exit(1);
}
while (stop_flag == 0) {
len = sizeof(struct sockaddr);
new = accept(sock, (struct sockaddr*)addr, &len);
if (new < 0) {
if (stop_flag != 0) {
break;
}
/*
* this is a bit cheesy, but much easier to implement than using select()
*/
usleep(100);
} else {
if (stop_flag == 0) {
process_socket(new);
}
}
}
close(sock);
freeaddrinfo(aiptr);
} else if (coap_mode == 1) {
#if !(HAVE_LIBCOAP)
printf("\nestserver not built with coap support and --enable-coap has been specified.\n");
exit(1);
#else
while (stop_flag == 0 && processing_error == 0) {
processing_error = est_server_coap_run_once(ctx);
}
#endif
} else {
printf("\ninvalid setting for coap_mode.\n");
exit(1);
}
#ifndef DISABLE_PTHREADS
// Notify all the workers that it's time to shutdown
pthread_cond_broadcast(&full);
// Wait for the workers to finish
pthread_mutex_lock(&mutex);
while (num_threads > 0) {
pthread_cond_wait(&cond, &mutex);
}
pthread_mutex_unlock(&mutex);
pthread_mutex_destroy(&mutex);
pthread_cond_destroy(&cond);
pthread_cond_destroy(&empty);
pthread_cond_destroy(&full);
#endif
stop_flag = 2;
return NULL;
}
#ifndef DISABLE_PTHREADS
static int start_thread (thread_func_t func)
{
pthread_t thread_id;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
return pthread_create(&thread_id, &attr, func, 0);
}
#endif
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)
{
#ifndef DISABLE_PTHREADS
int i;
#endif
struct sigaction sig_act;
/*
* Save a global reference to the context.
* This code only supports running a single
* instance of the server.
*/
ctx = ectx;
/*
* Make the port number visible to the master thread
* by setting up a global
*/
#ifdef HAVE_LIBCOAP
udp_port = port;
#endif
tcp_port = port;
if (v6) {
family = AF_INET6;
}
/*
* Install handler to catch ctrl-C to stop the process gracefully
*/
memset(&sig_act, 0, sizeof(struct sigaction));
sig_act.sa_handler = catch_int;
sigemptyset(&sig_act.sa_mask);
if (sigaction(SIGINT, &sig_act, NULL) == -1) {
printf("\nCannot set handler for SIGINT\n");
}
/*
* Indicate that the broken pipe signal during writes should be
* ignored
*/
memset(&sig_act, 0, sizeof(struct sigaction));
sig_act.sa_handler = SIG_IGN;
sigemptyset(&sig_act.sa_mask);
if (sigaction(SIGPIPE, &sig_act, NULL) == -1) {
printf("\nCannot set ignore action for SIGPIPE\n");
}
#ifndef DISABLE_PTHREADS
pthread_mutex_init(&mutex, NULL);
pthread_cond_init(&cond, NULL);
pthread_cond_init(&empty, NULL);
pthread_cond_init(&full, NULL);
// Start master (listening) thread
start_thread(master_thread);
// Start worker threads
for (i = 0; i < NUM_WORKER_THREADS; i++) {
if (start_thread(worker_thread) != 0) {
printf("\nCannot start worker thread: %d\n", errno);
} else {
pthread_mutex_lock(&mutex);
num_threads++;
pthread_mutex_unlock(&mutex);
}
}
#else
/*
* We're configured w/o support for pthreads.
* Just run the server on the current thread.
*/
master_thread(NULL);
#endif
if (delay > 0) {
/* We will automatically shut down the server
* after <delay> seconds */
sleep(delay);
stop_flag = 1;
}
while (!stop_flag) {
usleep(10000);
}
}
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