You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

162 lines
3.5 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <assert.h>
#include <unistd.h>
#include <signal.h>
#include "message.h"
#include "user.h"
#include "easysock.h"
#include "file_helpers.h"
#include "message_helpers.h"
#define BUFFER_SIZE 10000
#define MAX_CONNECTIONS 100
User** create_user_list(char* filename);
void sigint_handler(int dummy);
User* fetch_user(char* username);
User** users;
int num_users;
bool stop_running = false;
int main() {
signal(SIGINT,sigint_handler);
struct sockaddr temp_addr;
socklen_t temp_addrlen;
fd_set read_fd_set;
int conn_sockets[MAX_CONNECTIONS] = {-1};
User* dest_users[MAX_CONNECTIONS] = {NULL};
FD_ZERO(&read_fd_set);
char buffer[BUFFER_SIZE];
users = create_user_list("user_file.txt");
num_users = num_of_lines("user_file.txt");
struct sockaddr addr_struct;
int server_sock = create_local(4,'T',"127.0.0.1",30000,&addr_struct);
conn_sockets[0] = server_sock;
assert(listen(server_sock,MAX_CONNECTIONS) == 0);
while (true) {
FD_ZERO(&read_fd_set);
for (int i=0; i < MAX_CONNECTIONS; i++) {
if (conn_sockets[i] > 0) {
FD_SET(conn_sockets[i],&read_fd_set);
}
}
int num_conns = select(FD_SETSIZE, &read_fd_set, NULL, NULL, NULL);
if (num_conns > 0) {
if (FD_ISSET(conn_sockets[0],&read_fd_set)) {
int client_sock = accept(conn_sockets[0],&temp_addr,&temp_addrlen);
for (int i=0;i < MAX_CONNECTIONS; i++) {
if (conn_sockets[i] <= 0) {
conn_sockets[i] = client_sock;
break;
}
}
}
for (int i=1; i < MAX_CONNECTIONS; i++) {
if (FD_ISSET(conn_sockets[i],&read_fd_set)) {
int num_bytes_read = recv(conn_sockets[i],buffer,sizeof(buffer),0);
if (num_bytes_read <= 0) {
close(conn_sockets[i]);
conn_sockets[i] = 0;
dest_users[i] = NULL;
} else {
if (dest_users[i] == NULL) {
dest_users[i] = fetch_user(user_string(buffer));
if (dest_users[i] == NULL) {
printf("Invalid message format or User\n");
exit(241);
} else {
printf("Message intended for %s\n",dest_users[i]->username);
exit(0);
}
}
// for (int i=0;i<num_bytes_read;i++) {
// printf("%c",buffer[i]);
// }
}
}
}
}
if (stop_running) {
for (int i=0; i< MAX_CONNECTIONS; i++) {
close(conn_sockets[i]);
}
exit(130);
}
}
// Message message = new_message("Hello, this is a text message",users[0],users[1]);
// printf("Message was: %s\nSentfrom: %s\nSent to: %s\nWith password: %s\nSent at: %s\n",message.text, message.sender.username, message.recipient.username, message.recipient.password, asctime(&message.timeinfo));
}
User** create_user_list(char* filename) {
/* Structure of user file - <username> <password> on every line */
int num_users = num_of_lines(filename);
char* file_str = file_to_string(filename);
char* token = malloc(sizeof(char) * 30);
User** users = malloc (num_users * sizeof(User*));
token = strtok(file_str," \r\n");
for (int i=0;i<num_users-1;i++) {
users[i]->username = strdup(token);
token = strtok(NULL," \r\n");
users[i]->password = strdup(token);
token = strtok(NULL," \r\n");
}
return users;
}
void sigint_handler(int dummy) {
stop_running = true;
}
User* fetch_user(char* username) {
if (username == NULL) {
return NULL;
}
for (int i=0;i<num_users;i++) {
if (strcmp(users[i]->username, username) == 0) {
return users[i];
}
}
return NULL;
}