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comparison src/main.c @ 4:691358f944e8

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remove hardcoded host info
author Dennis <dennisconcepcionmartin@gmail.com>
date Tue, 18 Jul 2023 12:04:37 +0100
parents 052cf5cf100a
children 45bac89a4da3
comparison
equal deleted inserted replaced
3:e96eaa6b74c1 4:691358f944e8
1 #include <signal.h> 1 #include <signal.h>
2 #include <stdio.h> 2 #include <stdio.h>
3 #include <stdlib.h> 3 #include <stdlib.h>
4 #include <unistd.h>
4 #include <string.h> 5 #include <string.h>
5 #include <sys/types.h> 6 #include <sys/types.h>
6 #include <sys/socket.h> 7 #include <sys/socket.h>
8 #include <netdb.h>
7 #include <netinet/in.h> 9 #include <netinet/in.h>
8 #include <arpa/inet.h> 10 #include <arpa/inet.h>
9 #include <time.h> 11 #include <time.h>
10 12
11 13
13 15
14 16
15 void sig_handler(int sig_num) { 17 void sig_handler(int sig_num) {
16 if (sig_num == 2) { 18 if (sig_num == 2) {
17 printf("\nClosing socket\n"); 19 printf("\nClosing socket\n");
18 shutdown(socketfd, 2); 20 close(socketfd);
19 exit(0); 21 exit(0);
20 } 22 }
21 } 23 }
22 24
23 25
24 int main() { 26 int main() {
27
25 signal(SIGINT, sig_handler); 28 signal(SIGINT, sig_handler);
26 socketfd = socket(AF_INET, SOCK_STREAM, 0); 29
30 struct addrinfo hints;
31 struct addrinfo *servinfo;
32
33 memset(&hints, 0, sizeof hints); // Make sure the struct is empty
34 hints.ai_family = AF_UNSPEC; // Don't care IPv4 or IPv6
35 hints.ai_socktype = SOCK_STREAM; // TCP stream sockets
36 hints.ai_flags = AI_PASSIVE; // Fill in my IP for me
37
38 if ((getaddrinfo(NULL, "5050", &hints, &servinfo)) != 0) {
39 perror("getaddrinfo: ");
40 exit(1);
41 }
42
43 socketfd = socket(servinfo->ai_family, servinfo->ai_socktype, servinfo->ai_protocol);
27 44
28 if (socketfd == -1) { 45 if (socketfd == -1) {
29 perror("socket: "); 46 perror("socket: ");
30 exit(1); 47 exit(1);
31 } 48 }
32 49
33 struct sockaddr_in sin; 50 if (bind(socketfd, servinfo->ai_addr, servinfo->ai_addrlen) == -1) {
34 memset(&sin, 0, sizeof(sin));
35 sin.sin_family = AF_INET;
36 sin.sin_addr.s_addr = inet_addr("127.0.0.1");
37 sin.sin_port = htons(5050);
38
39 if (bind(socketfd, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
40 perror("bind: "); 51 perror("bind: ");
41 exit(1); 52 exit(1);
42 } 53 }
54
55 freeaddrinfo(servinfo);
43 56
44 if (listen(socketfd, 10) == -1) { 57 if (listen(socketfd, 10) == -1) {
45 perror("listen: "); 58 perror("listen: ");
46 exit(1); 59 exit(1);
47 } 60 }
48 61
62 char send_buffer[100];
63 struct sockaddr_storage clientinfo;
64 socklen_t clientinfo_size;
65
49 printf("Waiting for connections...\n"); 66 printf("Waiting for connections...\n");
50 char send_buffer[100];
51 67
52 while (1) { 68 while (1) {
53 int connfd = accept(socketfd, (struct sockaddr*)NULL, NULL); 69 int connfd = accept(socketfd, (struct sockaddr *)&clientinfo, &clientinfo_size);
54 70
55 if (connfd == -1) { 71 if (connfd == -1) {
56 perror("accept: \n"); 72 perror("accept: \n");
57 exit(1); 73 exit(1);
58 } 74 }
59 75
60 time_t now = time(NULL); 76 time_t now = time(NULL);
61 snprintf(send_buffer, sizeof(send_buffer), "Server time: %s\n", ctime(&now)); 77 snprintf(send_buffer, sizeof(send_buffer), "Server time: %s\n", ctime(&now));
62 send(connfd, send_buffer, sizeof(send_buffer), 0); 78 send(connfd, send_buffer, sizeof(send_buffer), 0);
63 shutdown(connfd, 2); 79 close(connfd);
64 } 80 }
65 81
66 return 0; 82 return 0;
67 } 83 }