1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <sys/socket.h>
#include <string.h>
#include <errno.h>
#include <netinet/in.h>
#include <unistd.h>
#define SERVER_PORT 6667
#define BUFFER_SIZE 1024
#define EXIT_COMMAND "exit"
int main() {
int server_fd = socket(AF_INET, SOCK_STREAM, 0);
if (server_fd == -1) {
perror("[ERROR] unable to create a socket");
return EXIT_FAILURE;
}
struct sockaddr_in server;
server.sin_addr.s_addr = htonl(INADDR_ANY);
server.sin_family = AF_INET;
server.sin_port = htons(SERVER_PORT);
int opt_val = 1;
setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &opt_val, sizeof(opt_val));
if (bind(server_fd, (struct sockaddr *) &server, sizeof(server)) == -1) {
perror("[ERROR] could not bind");
close(server_fd);
return EXIT_FAILURE;
}
if (listen(server_fd, SOMAXCONN) == -1) {
perror("[ERROR] could not listen");
close(server_fd);
return EXIT_FAILURE;
}
printf("[INFO] server listening at port (%d)\n", SERVER_PORT);
struct sockaddr_in client;
socklen_t client_len = sizeof(client);
int client_fd = accept(server_fd, (struct sockaddr *) &client, &client_len);
if (client_fd == -1) {
perror("[ERROR] could not accept connection");
close(server_fd);
return EXIT_FAILURE;
}
bool running = true;
while (running) {
char client_buf[BUFFER_SIZE];
memset(client_buf, 0, BUFFER_SIZE);
if (recv(client_fd, client_buf, BUFFER_SIZE, 0) == -1) {
perror("[ERROR] could not read data from client");
continue;
}
if (!strncasecmp(client_buf, EXIT_COMMAND, strlen(EXIT_COMMAND) - 1)) {
puts("[INFO] exiting program. bye bye!");
close(client_fd);
close(server_fd);
exit(EXIT_SUCCESS);
}
if (send(client_fd, client_buf, BUFFER_SIZE, 0) == -1) {
perror("[ERROR] could not send data to client");
continue;
}
}
close(client_fd);
close(server_fd);
return EXIT_SUCCESS;
}
|
