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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <limits.h>
#define SERVER_IP "127.0.0.1"
#define SERVER_PORT 6667
#define BUFFER_SIZE 512
int sock;
pthread_t recv_thread;
void *receive_handler(void *arg) {
char buffer[BUFFER_SIZE];
while (1) {
ssize_t bytes = recv(sock, buffer, sizeof(buffer) - 1, 0);
if (bytes <= 0) {
puts("Disconnected from server.");
close(sock);
exit(0);
}
buffer[bytes] = '\0';
printf("%s", buffer);
fflush(stdout);
}
return NULL;
}
void get_nickname(char *nickname, size_t size) {
char *user = getlogin();
if (!user) user = getenv("USER");
char hostname[HOST_NAME_MAX + 1];
if (gethostname(hostname, sizeof(hostname)) != 0) {
strncpy(hostname, "unknown", sizeof(hostname));
}
snprintf(nickname, size, "%s@%s", user ? user : "user", hostname);
}
int main() {
struct sockaddr_in server_addr;
char buffer[BUFFER_SIZE];
char nickname[100];
get_nickname(nickname, sizeof(nickname));
sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0) {
perror("socket");
return 1;
}
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(SERVER_PORT);
inet_pton(AF_INET, SERVER_IP, &server_addr.sin_addr);
if (connect(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
perror("connect");
return 1;
}
// Send NICK and USER commands
char init[BUFFER_SIZE];
snprintf(init, sizeof(init), "NICK %s\r\nUSER %s 0 * :realname\r\n", nickname, nickname);
send(sock, init, strlen(init), 0);
puts("Connected to chat server.");
pthread_create(&recv_thread, NULL, receive_handler, NULL);
while (1) {
fgets(buffer, sizeof(buffer), stdin);
if (strcmp(buffer, "/quit\n") == 0) {
break;
}
send(sock, buffer, strlen(buffer), 0);
}
close(sock);
return 0;
}
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