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Typedef custom structures

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This commit is contained in:
Igor Socec 2016-11-12 22:03:07 +01:00
parent 154f16a7f1
commit cad50493a6
6 changed files with 52 additions and 48 deletions
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10
client.c
View file

@ -5,7 +5,7 @@
#include "moxerver.h"
/* Closes client connection. */
int client_close(struct client_t *client) {
int client_close(client_t *client) {
char timestamp[TIMESTAMP_LEN];
/* force closing in case of error */
if (close(client->socket) == -1) {
@ -18,7 +18,7 @@ int client_close(struct client_t *client) {
}
/* Reads data from client into client data buffer. Returns number of read bytes. */
int client_read(struct client_t *client) {
int client_read(client_t *client) {
int len;
@ -55,7 +55,7 @@ int client_read(struct client_t *client) {
}
/* Sends data from a buffer to client. Returns number of sent bytes. */
int client_write(struct client_t *client, char *databuf, int datalen) {
int client_write(client_t *client, char *databuf, int datalen) {
int len;
@ -84,7 +84,7 @@ int client_write(struct client_t *client, char *databuf, int datalen) {
}
/* Waits for client input in "line mode". Blocks until input arrives. */
int client_wait_line(struct client_t *client) {
int client_wait_line(client_t *client) {
fd_set read_fds;
struct timeval tv;
@ -115,7 +115,7 @@ int client_wait_line(struct client_t *client) {
}
/* Waits for client to provide a username. Blocks until a username is entered. */
int client_ask_username(struct client_t *client) {
int client_ask_username(client_t *client) {
int i;
char msg[DATABUF_LEN];

2
moxerver.c
View file

@ -183,7 +183,7 @@ int main(int argc, char *argv[]) {
/* check if new client is availabe for connection */
if ( (client.socket == -1) && (new_client.socket != -1) ) {
/* copy new client information */
memcpy(&client, &new_client, sizeof(struct client_t));
memcpy(&client, &new_client, sizeof(client_t));
new_client.socket = -1;
fprintf(stderr, "[%s] client %s connected\n", NAME, client.ip_string);
/* ask client to provide a username before going to "character" mode */

51
moxerver.h
View file

@ -20,36 +20,39 @@
#define USERNAME_LEN 32
/* Structures used for communication parameters. */
struct server_t {
typedef struct
{
int socket; /* server socket */
struct sockaddr_in address; /* server address information */
unsigned int port; /* server port in host byte order, practical reference */
};
} server_t;
struct client_t {
typedef struct
{
int socket; /* client socket */
struct sockaddr_in address; /* client address information */
char ip_string[INET_ADDRSTRLEN]; /* client IP address as a string */
time_t last_active; /* time of client's last activity in seconds from Epoch */
char username[USERNAME_LEN]; /* username for human identification */
char data[DATABUF_LEN]; /* buffer for data received from client */
};
} client_t;
struct tty_t {
typedef struct
{
int fd; /* tty file descriptor */
struct termios ttysetdef; /* default tty termios settings */
struct termios ttyset; /* tty termios settings */
char path[DEV_PATH]; /* tty device path */
char data[DATABUF_LEN]; /* buffer for data received from tty */
};
} tty_t;
/* Global variables used throughout the application. */
int debug_messages; /* if > 0 debug messages will be printed */
struct server_t server; /* main server structure */
struct client_t client; /* connected client structure */ //TODO working with only 1 client, this can be expanded into a list
struct client_t new_client; /* client structure for new client request */
struct tty_t tty_dev; /* connected tty device */
server_t server; /* main server structure */
client_t client; /* connected client structure */ //TODO working with only 1 client, this can be expanded into a list
client_t new_client; /* client structure for new client request */
tty_t tty_dev; /* connected tty device */
/* Global functions used throughout the application. */
@ -72,7 +75,7 @@ int time2string(time_t time, char* timestamp);
* - 0 on success,
* - negative errno value set appropriately by error in setup process
*/
int server_setup(struct server_t *server, unsigned int port);
int server_setup(server_t *server, unsigned int port);
/**
* Closes the server socket.
@ -80,7 +83,7 @@ int server_setup(struct server_t *server, unsigned int port);
* Returns:
* 0 always, but internally tries closing again if it fails
*/
int server_close(struct server_t *server);
int server_close(server_t *server);
/**
* Accepts incoming client connection.
@ -89,7 +92,7 @@ int server_close(struct server_t *server);
* - 0 on success,
* - negative errno value set appropriately by error in setup process
*/
int server_accept(struct server_t *server, struct client_t *accepted_client);
int server_accept(server_t *server, client_t *accepted_client);
/**
* Thread function handling new client connections.
@ -113,7 +116,7 @@ void* server_new_client_thread(void *args);
* Returns:
* 0 always, but internally tries closing again if it fails
*/
int client_close(struct client_t *client);
int client_close(client_t *client);
/**
* Reads data from client into client data buffer.
@ -124,7 +127,7 @@ int client_close(struct client_t *client);
* - negative ENODATA value (-ENODATA) if client disconnected,
* - negative errno value set appropriately by error in reading
*/
int client_read(struct client_t *client);
int client_read(client_t *client);
/**
* Sends data from a buffer to client.
@ -133,7 +136,7 @@ int client_read(struct client_t *client);
* - number of sent bytes on success,
* - negative errno value set appropriately by error in sending
*/
int client_write(struct client_t *client, char *databuf, int datalen);
int client_write(client_t *client, char *databuf, int datalen);
/**
* Waits for client input in "line mode", where client sends a whole line of characters.
@ -143,7 +146,7 @@ int client_write(struct client_t *client, char *databuf, int datalen);
* - 0 on success
* - negative value if error occurred
*/
int client_wait_line(struct client_t *client);
int client_wait_line(client_t *client);
/**
* Waits for client to provide a username.
@ -153,7 +156,7 @@ int client_wait_line(struct client_t *client);
* - 0 on success
* - negative value if error occurred
*/
int client_ask_username(struct client_t *client);
int client_ask_username(client_t *client);
/* Functions handling details related to telnet protocol. */
@ -165,7 +168,7 @@ int client_ask_username(struct client_t *client);
* - 0 on success
* - negative value if error occurred
*/
int telnet_set_character_mode(struct client_t *client);
int telnet_set_character_mode(client_t *client);
/**
* Handles special characters in data buffer after receiving them from client.
@ -189,19 +192,19 @@ int telnet_handle_client_write(char *databuf, int *datalen);
/* Functions handling communication with tty device. */
/* Opens the tty device and configures it. */
int tty_open(struct tty_t *tty_dev);
int tty_open(tty_t *tty_dev);
/* Closes the tty device. */
int tty_close(struct tty_t *tty_dev);
int tty_close(tty_t *tty_dev);
/* Reconfigures the tty device. */
int tty_reconfigure(struct tty_t *tty_dev, struct termios newttyset);
int tty_reconfigure(tty_t *tty_dev, struct termios newttyset);
/* Reads incoming data from tty device to tty data buffer. */
int tty_read(struct tty_t *tty_dev);
int tty_read(tty_t *tty_dev);
/* Sends data from a buffer to tty device. */
int tty_write(struct tty_t *tty_dev, char *databuf, int datalen);
int tty_write(tty_t *tty_dev, char *databuf, int datalen);
/* Main tty thread function */
void *tty_thread_func(void *arg);

12
server.c
View file

@ -5,7 +5,7 @@
#include "moxerver.h"
/* Sets up the server on specific port, binds to a socket and listens for client connections. */
int server_setup(struct server_t *server, unsigned int port) {
int server_setup(server_t *server, unsigned int port) {
int opt;
char timestamp[TIMESTAMP_LEN];
@ -59,7 +59,7 @@ int server_setup(struct server_t *server, unsigned int port) {
}
/* Closes the server socket. */
int server_close(struct server_t *server) {
int server_close(server_t *server) {
char timestamp[TIMESTAMP_LEN];
/* force closing in case of error */
if (close(server->socket) == -1) {
@ -71,7 +71,7 @@ int server_close(struct server_t *server) {
}
/* Accepts incoming client connection. */
int server_accept(struct server_t *server, struct client_t *accepted_client) {
int server_accept(server_t *server, client_t *accepted_client) {
int namelen;
char timestamp[TIMESTAMP_LEN];
@ -108,14 +108,14 @@ void* server_new_client_thread(void *args) {
char msg[DATABUF_LEN];
char timestamp[TIMESTAMP_LEN];
struct client_t temp_client;
client_t temp_client;
/* accept new connection request */
if (server_accept(&server, &temp_client) != 0) return (void *) -1;
/* if no client is connected then make new client available for connection */
if (client.socket == -1) {
memcpy(&new_client, &temp_client, sizeof(struct client_t));
memcpy(&new_client, &temp_client, sizeof(client_t));
return (void *) 0;
}
@ -131,7 +131,7 @@ void* server_new_client_thread(void *args) {
}
/* make new client available for connection */
memcpy(&new_client, &temp_client, sizeof(struct client_t));
memcpy(&new_client, &temp_client, sizeof(client_t));
/* inform new client that port is already in use */
time2string(client.last_active, timestamp);

11
telnet.c
View file

@ -5,13 +5,14 @@
#include "moxerver.h"
/* structure for holding telnet option name and value */
struct telnet_option_t {
typedef struct
{
const char *name;
char value;
};
} telnet_option_t;
/* supported telnet option values */
struct telnet_option_t telnet_options[] = {
telnet_option_t telnet_options[] = {
{"WILL", 251},
{"WONT", 252},
{"DO", 253},
@ -45,7 +46,7 @@ static char telnet_option_value(const char* name) {
}
/* Sends telnet option command. Returns 0 on success, -1 on failure. */
static int telnet_send_command(struct client_t *client, const char* option, const char* command) {
static int telnet_send_command(client_t *client, const char* option, const char* command) {
char data[3];
@ -77,7 +78,7 @@ static int telnet_handle_command(char *databuf, int datalen) {
}
/* Tells client to go into "character" mode. */
int telnet_set_character_mode(struct client_t *client) {
int telnet_set_character_mode(client_t *client) {
int err = 0;

12
tty.c
View file

@ -10,7 +10,7 @@
#define TTY_DEF_BAUD_RATE B115200
/* Opens the tty device and configures it. */
int tty_open(struct tty_t *tty_dev) {
int tty_open(tty_t *tty_dev) {
int fd;
// PROPOSAL:
// open tty device to get file descriptor @tty_dev.fd
@ -59,7 +59,7 @@ int tty_open(struct tty_t *tty_dev) {
}
/* Closes the tty device. */
int tty_close(struct tty_t *tty_dev) {
int tty_close(tty_t *tty_dev) {
int fd = tty_dev->fd;
tty_dev->fd = -1;
@ -78,7 +78,7 @@ int tty_close(struct tty_t *tty_dev) {
}
/* Reconfigures the tty device. */
int tty_reconfigure(struct tty_t *tty_dev, struct termios newttyset) {
int tty_reconfigure(tty_t *tty_dev, struct termios newttyset) {
// not sure how to organize this:
// 1. parameters in external termios struct, copied @tty_dev.ttyset, applied with tcsetattr()
// 2. parameters directly @tty_dev.ttyset, applied with tcsetattr()
@ -86,13 +86,13 @@ int tty_reconfigure(struct tty_t *tty_dev, struct termios newttyset) {
}
/* Reads incoming data from tty device to tty data buffer. */
int tty_read(struct tty_t *tty_dev) {
int tty_read(tty_t *tty_dev) {
// read and save @tty_dev.data
return 0;
}
/* Sends data from a buffer to tty device. */
int tty_write(struct tty_t *tty_dev, char *databuf, int datalen) {
int tty_write(tty_t *tty_dev, char *databuf, int datalen) {
write(tty_dev->fd, databuf, datalen);
// databuf should point to client data buffer
return 0;
@ -101,7 +101,7 @@ int tty_write(struct tty_t *tty_dev, char *databuf, int datalen) {
/* Main thread for reading and writing to tty device */
void *tty_thread_func(void *arg) {
//char c;
struct tty_t *tty_dev = (struct tty_t*)arg;
tty_t *tty_dev = (tty_t*)arg;
struct timeval tv;
ssize_t br = 0;
int ret;