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
81
82
83
84
85
86
87
88
|
#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
int main() {
struct sockaddr_in server;
int server_fd = socket(AF_INET, SOCK_STREAM, 0);
if (server_fd == -1) {
perror("Unable to create a socket");
return EXIT_FAILURE;
}
server.sin_addr.s_addr = htonl(INADDR_ANY);
server.sin_family = AF_INET;
server.sin_port = htons(SERVER_PORT);
int binderr = bind(server_fd, (struct sockaddr *) &server, sizeof(server));
if (binderr == -1) {
perror("Could not bind");
return EXIT_FAILURE;
}
int listenerr = listen(server_fd, SOMAXCONN);
if (listenerr == -1) {
perror("Could not listen");
return EXIT_FAILURE;
}
printf("Server listening at %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("Could not accept connections");
exit(1);
return EXIT_FAILURE;
}
char exit[] = "EXIT\r\n";
while (true) {
char client_buf[1024];
memset(client_buf, 0, 1024);
read(client_fd, client_buf, 1024);
printf("RECEIVED: %s\n", client_buf);
for (int i=0; client_buf[i] != 0; i++) {
printf("%d-", (int) client_buf[i]);
}
putchar(0xa);
for (int i = 0; exit[i] != 0; i++) {
printf("%d-", (int)exit[i]);
}
putchar(0xa);
if (!strncmp(client_buf, exit, 4)) {
puts("Bye");
close(server_fd);
close(client_fd);
return EXIT_SUCCESS;
}
write(client_fd, client_buf, 1024);
}
return EXIT_SUCCESS;
}
|
