├── README.md
├── client.c
└── server.c


/README.md:
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1 | # TCP-Client-Server-Implementation-in-C


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/client.c:
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 1 | #include <stdio.h>
 2 | #include <stdlib.h>
 3 | #include <string.h>
 4 | #include <unistd.h>
 5 | #include <arpa/inet.h>
 6 | 
 7 | int main(){
 8 | 
 9 |   char *ip = "127.0.0.1";
10 |   int port = 5566;
11 | 
12 |   int sock;
13 |   struct sockaddr_in addr;
14 |   socklen_t addr_size;
15 |   char buffer[1024];
16 |   int n;
17 | 
18 |   sock = socket(AF_INET, SOCK_STREAM, 0);
19 |   if (sock < 0){
20 |     perror("[-]Socket error");
21 |     exit(1);
22 |   }
23 |   printf("[+]TCP server socket created.\n");
24 | 
25 |   memset(&addr, '\0', sizeof(addr));
26 |   addr.sin_family = AF_INET;
27 |   addr.sin_port = port;
28 |   addr.sin_addr.s_addr = inet_addr(ip);
29 | 
30 |   connect(sock, (struct sockaddr*)&addr, sizeof(addr));
31 |   printf("Connected to the server.\n");
32 | 
33 |   bzero(buffer, 1024);
34 |   strcpy(buffer, "HELLO, THIS IS CLIENT.");
35 |   printf("Client: %s\n", buffer);
36 |   send(sock, buffer, strlen(buffer), 0);
37 | 
38 |   bzero(buffer, 1024);
39 |   recv(sock, buffer, sizeof(buffer), 0);
40 |   printf("Server: %s\n", buffer);
41 | 
42 |   close(sock);
43 |   printf("Disconnected from the server.\n");
44 | 
45 |   return 0;
46 | 
47 | }
48 | 


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/server.c:
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 1 | #include <stdio.h>
 2 | #include <stdlib.h>
 3 | #include <string.h>
 4 | #include <unistd.h>
 5 | #include <arpa/inet.h>
 6 | 
 7 | int main(){
 8 | 
 9 |   char *ip = "127.0.0.1";
10 |   int port = 5566;
11 | 
12 |   int server_sock, client_sock;
13 |   struct sockaddr_in server_addr, client_addr;
14 |   socklen_t addr_size;
15 |   char buffer[1024];
16 |   int n;
17 | 
18 |   server_sock = socket(AF_INET, SOCK_STREAM, 0);
19 |   if (server_sock < 0){
20 |     perror("[-]Socket error");
21 |     exit(1);
22 |   }
23 |   printf("[+]TCP server socket created.\n");
24 | 
25 |   memset(&server_addr, '\0', sizeof(server_addr));
26 |   server_addr.sin_family = AF_INET;
27 |   server_addr.sin_port = port;
28 |   server_addr.sin_addr.s_addr = inet_addr(ip);
29 | 
30 |   n = bind(server_sock, (struct sockaddr*)&server_addr, sizeof(server_addr));
31 |   if (n < 0){
32 |     perror("[-]Bind error");
33 |     exit(1);
34 |   }
35 |   printf("[+]Bind to the port number: %d\n", port);
36 | 
37 |   listen(server_sock, 5);
38 |   printf("Listening...\n");
39 | 
40 |   while(1){
41 |     addr_size = sizeof(client_addr);
42 |     client_sock = accept(server_sock, (struct sockaddr*)&client_addr, &addr_size);
43 |     printf("[+]Client connected.\n");
44 | 
45 |     bzero(buffer, 1024);
46 |     recv(client_sock, buffer, sizeof(buffer), 0);
47 |     printf("Client: %s\n", buffer);
48 | 
49 |     bzero(buffer, 1024);
50 |     strcpy(buffer, "HI, THIS IS SERVER. HAVE A NICE DAY!!!");
51 |     printf("Server: %s\n", buffer);
52 |     send(client_sock, buffer, strlen(buffer), 0);
53 | 
54 |     close(client_sock);
55 |     printf("[+]Client disconnected.\n\n");
56 | 
57 |   }
58 | 
59 |   return 0;
60 | }
61 | 


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