Start working on client listener

2016-08-29 17:21:20 +03:00
parent fa16b4fb8c
commit 97d7ec8b13
11 changed files with 322 additions and 77 deletions
--- a/client_pool.c
+++ b/client_pool.c
@@ -0,0 +1,137 @@
+#include "client_pool.h"
+#include "log.h"
+#include "protocol.h"
+#include <pthread.h>
+#include <unistd.h>
+
+#define MAXJOBS 10
+
+struct client_args {
+	int busy;
+	SSL *ssl;
+	int sd;
+	char ip[16]; /* IPv4 */
+};
+
+static void* servlet(void *args);
+static void send_reject_msg(SSL *ssl);
+
+static void* servlet(void *args)  /* Serve the connection -- threadable */
+{
+        struct msg_t buf;
+        int bytes, ret;
+	//unsigned short job[MAXJOBS] = { 0 };
+	struct client_args *client = (struct client_args*)args;
+	
+	SSL_load_error_strings();
+	ret = SSL_accept(client->ssl);
+	/* We check for unclean (ret < 0) and clean (ret == 0) failures */
+	if (ret <= 0) {
+                log(WARNING, "SSL_accept() failed. Reason below:");
+		log_ssl();
+	} else {
+		do {
+			//buf.meta.type = GET_MEMORY;
+			//sleep(1);
+			//SSL_write(client->ssl, &buf, sizeof(buf));
+			bytes = SSL_read(client->ssl, &buf, sizeof(buf));
+			if (bytes > 0) {
+				if (bytes != sizeof(struct msg_t)) {
+					log(WARNING,
+						"Client [%s] sent non-standard data!",
+						client->ip );
+					continue;
+				}
+				
+				log(VERBOSE, "Client msg: \"%s\"", buf.chunk.data);
+				/* TODO: Insert msg handler here */
+
+				continue;
+			}
+			if (SSL_get_shutdown(client->ssl) == SSL_RECEIVED_SHUTDOWN)
+				log(VERBOSE, "SSL_RECEIVED_SHUTDOWN from client [%s]", client->ip);
+			else {
+				log(VERBOSE, "Client didn't send data! SSL error below:");
+				//log_ssl(); /* We actually don't have anything to log from SSL */
+				sprintf((char*)buf.chunk.data, "%s", "Where's the data, m8?");
+				SSL_write(client->ssl, &buf, sizeof(struct msg_t));
+			}
+			log(INFO, "Client [%s] disconnected.", client->ip);
+		} while (bytes);
+	}
+	SSL_free(client->ssl);          /* release SSL state */
+	close(client->sd);              /* close connection */
+	client->busy = 0;
+	return 0;
+}
+
+static void send_reject_msg(SSL *ssl)
+{
+	char *reply = "FAILURE - The connection queue is full!\n";
+	SSL_write(ssl, reply, strlen(reply));
+}
+
+void* client_pool(void *args)
+{
+	struct pool_data *pool = args;
+	pthread_mutex_t mutex;
+	pthread_attr_t attr;
+	pthread_t *client_thread = (pthread_t*)malloc(pool->size * sizeof(pthread_t));
+	struct client_args *client_struct =
+			(struct client_args*)malloc(pool->size * sizeof(struct client_args));
+	int i;
+	
+	memset(client_thread, 0, sizeof(pthread_t) * pool->size);
+	memset(client_struct, 0, sizeof(struct client_args) * pool->size);
+	
+	pthread_mutex_init(&mutex, NULL);
+	pthread_attr_init(&attr);
+	pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
+
+	while (1) {
+		struct sockaddr_in addr;
+	        char address[INET6_ADDRSTRLEN];
+	        socklen_t len = sizeof(addr);
+	        SSL *ssl;
+	        int agent = accept(pool->srv, (struct sockaddr*)&addr, &len);
+	        log(INFO,
+			"Connection: %s:%d",
+			inet_ntop(AF_INET, &addr.sin_addr, address, sizeof(address)),
+			ntohs(addr.sin_port));
+		
+		for (i = 0; i < pool->size; i++) {
+			if (!client_struct[i].busy) {
+				client_struct[i].busy = 1;
+				client_struct[i].ssl = SSL_new(pool->ctx);
+				client_struct[i].sd = agent;
+				memcpy( client_struct[i].ip,
+					inet_ntop(AF_INET, &addr.sin_addr, address, sizeof(address)),
+					sizeof(client_struct[i].ip) );
+				SSL_set_fd(client_struct[i].ssl, client_struct[i].sd);
+				pthread_create( &client_thread[i],
+						&attr,
+						servlet,
+						&client_struct[i] );
+				break;
+			}
+		}
+		if (i == pool->size) {
+			log( WARNING,
+				   "Agent [%s] dropped. Poolsize limit reached.",
+				   inet_ntop(AF_INET, &addr.sin_addr, address, sizeof(address))
+			);
+			ssl = SSL_new(pool->ctx);
+			SSL_set_fd(ssl, agent);
+			if (SSL_accept(ssl) == FAIL) {
+				SSL_free(ssl);
+				close(agent);
+				continue;
+			}
+			send_reject_msg(ssl);
+			SSL_free(ssl);
+			close(agent);
+		}
+	}
+	pthread_attr_destroy(&attr);
+	pthread_mutex_destroy(&mutex);
+}