├── img
    ├── README.md
    └── File Transfer TCP.png
├── send.txt
├── Makefile
├── README.md
├── client.c
└── server.c


/img/README.md:
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1 | 
2 | 


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/send.txt:
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1 | This is a sample text file.
2 | Lets add one more line to it.
3 | 


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/img/File Transfer TCP.png:
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https://raw.githubusercontent.com/nikhilroxtomar/File-Transfer-using-TCP-Socket-in-C/HEAD/img/File Transfer TCP.png


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/Makefile:
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 1 | server:
 2 | 	gcc server.c -o server
 3 | 
 4 | client:
 5 | 	gcc client.c -o client
 6 | 
 7 | clean:
 8 | 	rm server
 9 | 	rm client
10 | 
11 | all: server client
12 | 


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/README.md:
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 1 | # File-Transfer-using-TCP-Socket-in-C
 2 | A simple TCP client-server program written in C. In this program the client read a file and send its data to server. The server then receives the data and write it in a text file.
 3 | <br/><br/>
 4 | Blog post: https://idiotdeveloper.com/file-transfer-using-tcp-socket-in-c/
 5 | <br/>
 6 | 
 7 | <img src="img/File Transfer TCP.png">
 8 | 
 9 | Use the Makefile to compile the code.
10 | <ul>
11 | <li>make server - to compile the server.</li>
12 | <li>make client- to compile the client.</li>
13 | <li>make all - to compile both the server and client.</li>
14 | </ul>
15 | 


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/client.c:
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 1 | #include <stdio.h>
 2 | #include <stdlib.h>
 3 | #include <unistd.h>
 4 | #include <string.h>
 5 | #include <arpa/inet.h>
 6 | #define SIZE 1024
 7 | 
 8 | void send_file(FILE *fp, int sockfd){
 9 |   int n;
10 |   char data[SIZE] = {0};
11 | 
12 |   while(fgets(data, SIZE, fp) != NULL) {
13 |     if (send(sockfd, data, sizeof(data), 0) == -1) {
14 |       perror("[-]Error in sending file.");
15 |       exit(1);
16 |     }
17 |     bzero(data, SIZE);
18 |   }
19 | }
20 | 
21 | int main(){
22 |   char *ip = "127.0.0.1";
23 |   int port = 8080;
24 |   int e;
25 | 
26 |   int sockfd;
27 |   struct sockaddr_in server_addr;
28 |   FILE *fp;
29 |   char *filename = "send.txt";
30 | 
31 |   sockfd = socket(AF_INET, SOCK_STREAM, 0);
32 |   if(sockfd < 0) {
33 |     perror("[-]Error in socket");
34 |     exit(1);
35 |   }
36 |   printf("[+]Server socket created successfully.\n");
37 | 
38 |   server_addr.sin_family = AF_INET;
39 |   server_addr.sin_port = port;
40 |   server_addr.sin_addr.s_addr = inet_addr(ip);
41 | 
42 |   e = connect(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr));
43 |   if(e == -1) {
44 |     perror("[-]Error in socket");
45 |     exit(1);
46 |   }
47 | 	printf("[+]Connected to Server.\n");
48 | 
49 |   fp = fopen(filename, "r");
50 |   if (fp == NULL) {
51 |     perror("[-]Error in reading file.");
52 |     exit(1);
53 |   }
54 | 
55 |   send_file(fp, sockfd);
56 |   printf("[+]File data sent successfully.\n");
57 | 
58 | 	printf("[+]Closing the connection.\n");
59 |   close(sockfd);
60 | 
61 |   return 0;
62 | }
63 | 


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/server.c:
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 1 | #include <stdio.h>
 2 | #include <stdlib.h>
 3 | #include <string.h>
 4 | #include <arpa/inet.h>
 5 | #define SIZE 1024
 6 | 
 7 | void write_file(int sockfd){
 8 |   int n;
 9 |   FILE *fp;
10 |   char *filename = "recv.txt";
11 |   char buffer[SIZE];
12 | 
13 |   fp = fopen(filename, "w");
14 |   while (1) {
15 |     n = recv(sockfd, buffer, SIZE, 0);
16 |     if (n <= 0){
17 |       break;
18 |       return;
19 |     }
20 |     fprintf(fp, "%s", buffer);
21 |     bzero(buffer, SIZE);
22 |   }
23 |   return;
24 | }
25 | 
26 | int main(){
27 |   char *ip = "127.0.0.1";
28 |   int port = 8080;
29 |   int e;
30 | 
31 |   int sockfd, new_sock;
32 |   struct sockaddr_in server_addr, new_addr;
33 |   socklen_t addr_size;
34 |   char buffer[SIZE];
35 | 
36 |   sockfd = socket(AF_INET, SOCK_STREAM, 0);
37 |   if(sockfd < 0) {
38 |     perror("[-]Error in socket");
39 |     exit(1);
40 |   }
41 |   printf("[+]Server socket created successfully.\n");
42 | 
43 |   server_addr.sin_family = AF_INET;
44 |   server_addr.sin_port = port;
45 |   server_addr.sin_addr.s_addr = inet_addr(ip);
46 | 
47 |   e = bind(sockfd, (struct sockaddr*)&server_addr, sizeof(server_addr));
48 |   if(e < 0) {
49 |     perror("[-]Error in bind");
50 |     exit(1);
51 |   }
52 |   printf("[+]Binding successfull.\n");
53 | 
54 |   if(listen(sockfd, 10) == 0){
55 | 		printf("[+]Listening....\n");
56 | 	}else{
57 | 		perror("[-]Error in listening");
58 |     exit(1);
59 | 	}
60 | 
61 |   addr_size = sizeof(new_addr);
62 |   new_sock = accept(sockfd, (struct sockaddr*)&new_addr, &addr_size);
63 |   write_file(new_sock);
64 |   printf("[+]Data written in the file successfully.\n");
65 | 
66 |   return 0;
67 | }
68 | 


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