removed TTY port constraints, added client activity timestamps

client.c

@@ -6,12 +6,14 @@
 
 /* Closes client connection. */
 int client_close(struct client_t *client) {
+	char timestamp[TIMESTAMP_LEN];
 	/* force closing in case of error */
 	if (close(client->socket) == -1) {
 		close(client->socket);
 	}
 	client->socket = -1;
-	fprintf(stderr,"[%s] socket closed for client %s\n", __func__, client->ip_string);
+	time2string(time(NULL), timestamp);
+	fprintf(stderr,"[%s] socket closed for client %s @ %s\n", __func__, client->ip_string, timestamp);
 	return 0;
 }
 
@@ -46,6 +48,9 @@ int client_read(struct client_t *client) {
 	/* handle special telnet characters coming from client */
 	telnet_handle_client_read(client->data, &len);
 	
+	/* grab current time and store it as client last activity */
+	client->last_active = time(NULL);
+	
 	return len;
 }
 

moxerver.c

@@ -11,14 +11,12 @@
 #define NAME "moxerver"
 
 #define SERVER_WAIT_TIMEOUT 5 /* seconds for select() timeout in server loop */
-#define PORT_MIN 4001 /* minimum TCP port number */
-#define PORT_MAX 4008 /* maximum TCP port number */
 
 /* Prints help message. */
 static void usage() {
 	//TODO maybe some styling should be done
-	fprintf(stderr, "Usage: moxerver -p tcp_port -t tty_path [-h]\n");
-	fprintf(stderr, "- tcp_port range [%d .. %d]\n\n", PORT_MIN, PORT_MAX);
+	fprintf(stderr, "Usage: %s -p tcp_port -t tty_path [-h]\n", NAME);
+	fprintf(stderr, "\n");
 }
 
 /* Performs cleanup and exit. */
@@ -42,6 +40,12 @@ void quit_handler(int signum) {
 	cleanup(0);
 }
 
+/* Converts from time in seconds from Epoch to conveniently formatted string. */
+int time2string(time_t time, char* timestamp) {
+	strftime(timestamp, TIMESTAMP_LEN, TIMESTAMP_FORMAT, localtime(&time));
+	return 0;
+}
+
 /* MoxaNix main program loop. */
 int main(int argc, char *argv[]) {
 	
@@ -94,14 +98,6 @@ int main(int argc, char *argv[]) {
 				return -1;
 		}
 	}
-	/* check arguments */
-	if (tcp_port < PORT_MIN || tcp_port > PORT_MAX) {
-		//TODO do we really put port constraints in moxerver? Maybe higher SW layer that controls all servers should handle it.
-		fprintf(stderr, "[%s] error: port number out of %d-%d range\n\n",
-				NAME, PORT_MIN, PORT_MAX);
-		usage();
-		return -1;
-	}
 	
 	/* introduction message */
 	fprintf(stderr, "[%s] === MoxaNix ===\n", NAME);
@@ -152,6 +148,7 @@ int main(int argc, char *argv[]) {
 					ret = server_accept(&server, &client);
 					if ( ret != 0) {
 						/* print error but continue waiting for connection request */
+						//TODO maybe we should break here to avoid endless loop
 						fprintf(stderr, "[%s] problem accepting client\n", NAME);
 						continue;
 					}
@@ -184,7 +181,17 @@ int main(int argc, char *argv[]) {
 			}
 		}
 		if (ret == 0) {
-			fprintf(stderr, "[%s] server waiting\n", NAME);
+			/* do something with inactive client */
+			if (client.socket != -1) {
+				//TODO we could drop client if inactive for some time
+				time_t current_time = time(NULL);
+				fprintf(stderr, "[%s] client last active %u seconds ago\n", NAME,
+						(unsigned int) (current_time - client.last_active));
+			}
+			/* do something while listening for client connections */
+			else {
+				fprintf(stderr, "[%s] listening for client connection\n", NAME);
+			}
 		}
 		
 	} /* END while() loop */

moxerver.h

@@ -10,10 +10,12 @@
 #include <netinet/tcp.h> /* TCP_NODELAY */
 #include <arpa/inet.h>
 #include <termios.h>
+#include <time.h>
 
-#define DATA_BUFLEN 128
+#define DATABUF_LEN 128
 #define DEV_PATH 32
-
+#define TIMESTAMP_FORMAT "%d.%m.%Y. %H:%M:%S"
+#define TIMESTAMP_LEN 20+1 /* calculated following timestamp format */
 
 /* Structures used for communication parameters. */
 struct server_t {
@@ -26,14 +28,15 @@ struct client_t {
 	int socket; 						/* client socket */
 	struct sockaddr_in address; 		/* client address information */
 	char ip_string[INET_ADDRSTRLEN]; 	/* client IP address as a string */
-	char data[DATA_BUFLEN]; 			/* buffer for data received from client */
+	time_t last_active; 				/* time of client's last activity in seconds from Epoch */
+	char data[DATABUF_LEN]; 			/* buffer for data received from client */
 };
 
 struct tty_t {
 	int fd; 					/* tty file descriptor */
 	struct termios ttyset;		/* tty termios settings */
 	char path[DEV_PATH]; 		/* tty device path */
-	char data[DATA_BUFLEN]; 	/* buffer for data received from tty */
+	char data[DATABUF_LEN]; 	/* buffer for data received from tty */
 };
 
 
@@ -43,6 +46,17 @@ struct client_t client; 	/* connected client structure */ //TODO working with on
 struct tty_t tty_dev; 		/* connected tty device */
 
 
+/* Global functions used throughout the application. */
+
+/**
+ * Converts from time in seconds from Epoch to conveniently formatted string.
+ * 
+ * Returns:
+ * 0 always
+ */
+int time2string(time_t time, char* timestamp);
+
+
 /* Functions handling server operation. */
 
 /**
@@ -58,7 +72,7 @@ int server_setup(struct server_t *server, unsigned int port);
  * Closes the server socket.
  * 
  * Returns:
- * 0 always, but internally tries closing again if it fails.
+ * 0 always, but internally tries closing again if it fails
  */
 int server_close(struct server_t *server);
 
@@ -86,12 +100,13 @@ int server_reject(struct server_t *server);
  * Closes client connection.
  * 
  * Returns:
- * 0 always, but internally tries closing again if it fails.
+ * 0 always, but internally tries closing again if it fails
  */
 int client_close(struct client_t *client);
 
 /**
  * Reads data from client into client data buffer.
+ * Also updates client's last activity timestamp.
  * 
  * Returns:
  * - number of read bytes on success,

server.c

@@ -8,6 +8,7 @@
 int server_setup(struct server_t *server, unsigned int port) {
 	
 	int opt;
+	char timestamp[TIMESTAMP_LEN];
 	
 	/* set up server address information */
 	server->address.sin_family = AF_INET; 			/* use IPv4 address family */
@@ -52,17 +53,20 @@ int server_setup(struct server_t *server, unsigned int port) {
 		return -errno;
 	}
 	
-	fprintf(stderr,"[%s] server is up, listening for client connection\n", __func__);
+	time2string(time(NULL), timestamp);
+	fprintf(stderr,"[%s] server is up @ %s\n", __func__, timestamp);
 	return 0;
 }
 
 /* Closes the server socket. */
 int server_close(struct server_t *server) {
+	char timestamp[TIMESTAMP_LEN];
 	/* force closing in case of error */
 	if (close(server->socket) == -1) {
 		close(server->socket);
 	}
-	fprintf(stderr,"[%s] socket closed, server is down\n", __func__);
+	time2string(time(NULL), timestamp);
+	fprintf(stderr,"[%s] socket closed, server is down @ %s\n", __func__, timestamp);
 	return 0;
 }
 
@@ -70,6 +74,7 @@ int server_close(struct server_t *server) {
 int server_accept(struct server_t *server, struct client_t *accepted_client) {
 	
 	int namelen;
+	char timestamp[TIMESTAMP_LEN];
 	
 	/* accept connection request */
 	namelen = sizeof(accepted_client->address);
@@ -88,10 +93,13 @@ int server_accept(struct server_t *server, struct client_t *accepted_client) {
 	inet_ntop(accepted_client->address.sin_family, &accepted_client->address.sin_addr.s_addr, 
 				accepted_client->ip_string, INET_ADDRSTRLEN);
 	
+	/* grab current time and store it as client last activity*/
+	accepted_client->last_active = time(NULL);
+	
 	/* print client information */
-	//TODO also print timestamp
-	fprintf(stderr, "[%s] accepted client %s on port %u\n", __func__,
-			accepted_client->ip_string, server->port);
+	time2string(accepted_client->last_active, timestamp);
+	fprintf(stderr, "[%s] accepted client %s on port %u @ %s\n", __func__,
+			accepted_client->ip_string, server->port, timestamp);
 	return 0;
 }
 
@@ -101,6 +109,7 @@ int server_reject(struct server_t *server) {
 	int namelen;
 	struct client_t rclient;
 	char reject_msg[128];
+	char timestamp[TIMESTAMP_LEN];
 	
 	/* accept connection request */
 	namelen = sizeof(rclient.address);
@@ -111,6 +120,7 @@ int server_reject(struct server_t *server) {
 	/* close connection */
 	close(rclient.socket);
 	
-	fprintf(stderr, "[%s] rejected new client request, there is alredy a client connected\n", __func__);
+	time2string(time(NULL), timestamp);
+	fprintf(stderr, "[%s] rejected new client request @ %s\n", __func__, timestamp);
 	return 0;
 }

telnet.c

@@ -96,7 +96,7 @@ int telnet_set_character_mode(struct client_t *client) {
 int telnet_handle_client_read(char *databuf, int *datalen) {	
 	
 	int i;
-	char newdata[DATA_BUFLEN];
+	char newdata[DATABUF_LEN];
 	int newlen = 0;
 	
 	/* process data using a new buffer */
@@ -123,7 +123,7 @@ int telnet_handle_client_read(char *databuf, int *datalen) {
 int telnet_handle_client_write(char *databuf, int *datalen) {
 	
 	int i;
-	char newdata[DATA_BUFLEN];
+	char newdata[DATABUF_LEN];
 	int newlen = 0;
 	
 	/* process data using a new buffer */

tty.c

@@ -93,7 +93,7 @@ void *tty_thread_func(void *arg) {
 		ret = select(tty_dev->fd + 1, &read_fds, NULL, NULL, &tv);
 
 		if (ret > 0 && FD_ISSET(tty_dev->fd, &read_fds)) {
-			br = read(tty_dev->fd, tty_dev->data, DATA_BUFLEN);
+			br = read(tty_dev->fd, tty_dev->data, DATABUF_LEN);
 			client_write(&client, tty_dev->data, br);
 		}
 		else {