TCP file upload server client example

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Huma Chaudhry

Technology Education

Some Important
Terms:

socket
Stream:
a host-local,
Listen: Server does the
Listening at a port for application-created,
you OS-controlled interface
Port: 65535 ports (a “door”) into which
application process can
Socket: a door
between application both send and
process and end-end- receive messages to/from
transport protocol another application
(UCP or TCP) process
Try-Catch

Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 2

Overview of Client/Server interaction
TCP
create socket,
port=xyz, for
incoming request:
welcomeSocket =
ServerSocket()
TCP create socket,
wait for incoming
connection request connection setup connect to hostid, port=x
clientSocket =
connectionSocket =
welcomeSocket.accept() Socket()

send request using
read request from clientSocket
connectionSocket

write reply to
connectionSocket read reply from
clientSocket
close
connectionSocket Close req
3 clientSocket
Huma Chaudhry(ME111012), Nima Bahrami(ME101004)

controlled by
controlled by process application
application process
developer
developer socket socket
TCP with TCP with controlled by
controlled by
buffers, operating
operating buffers, internet system
system variables variables

host or host or
server server
Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 4

Networking:

Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 5

Sneak Peak into the Code

Server Side

Client Side

Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 6

Huma Chaudhry(ME111012), Nima Bahrami(ME101004)

Socket programming (server)
Passive Listening:

7

Socket programming (server)
Streams of Data to carry data to/from Client:

Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 8

Socket programming (server)
Receiving File from Client:

Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 9

Socket programming (server)
Client Terminating Connection:

Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 10

Socket programming (server)
Server Terminating Connection:

Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 11

Client Request for Connection:-

Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 12

Socket programming: Client
Client reaching out to Server

Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 13

Client Communication with Server:

Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 14

Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 15

Client Side:
Client Sending File

Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 16

Client Closing Connection:

Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 17

Thanks to TCP

Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 18

Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 19

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CODE FOR echo_client.c: /* A simple echo client using TCP */ #include #include #include #include #include #include #include #include #include #define SERVER_TCP_PORT 3000 /* well-known port */ #define BUFLEN 256 /* buffer length */ int main(int argc, char **argv) { int n, i, bytes_to_read; int sd, port; struct hostent *hp; struct sockaddr_in server; char *host, *bp, rbuf[BUFLEN], sbuf[BUFLEN]; switch(argc){ case 2: host = argv[1]; port = SERVER_TCP_PORT; break; case 3: host = argv[1]; port = atoi(argv[2]); break; default: fprintf(stderr, "Usage: %s host [port]\n", argv[0]); exit(1); } /* Create a stream socket */ if ((sd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { fprintf(stderr, "Can't creat a socket\n"); exit(1); } bzero((char *)&server, sizeof(struct sockaddr_in)); server.sin_family = AF_INET; server.sin_port = htons(port); if (hp = gethostbyname(host)) bcopy(hp->h_addr, (char *)&server.sin_addr, hp->h_length); else if ( inet_aton(host, (struct in_addr *) &server.sin_addr) ){ fprintf(stderr, "Can't get server's address\n"); exit(1); } /* Connecting to the server */ if (connect(sd, (struct sockaddr *)&server, sizeof(server)) == -1){ fprintf(stderr, "Can't connect \n"); exit(1); } printf("Transmit: \n"); while(n=read(0, sbuf, BUFLEN)){ /* get user message */ write(sd, sbuf, n); /* send it out */ printf("Receive: \n"); bp = rbuf; bytes_to_read = n; while ((i = read(sd, bp, bytes_to_read)) > 0){ bp += i; bytes_to_read -=i; } write(1, rbuf, n); printf("Transmit: \n"); } close(sd); return(0); } CODE FOR echo_server.c: /* A simple echo server using TCP */ #include #include #include #include #include #include #include #include #include #define SERVER_TCP_PORT 3000 /* well-known port */ #define BUFLEN 256 /* buffer length */ int echod(int); void reaper(int); int main(int argc, char **argv) { int sd, new_sd, client_len, port; struct sockaddr_in server, client; switch(argc){ case 1: port = SERVER_TCP_PORT; break; case 2: port = atoi(argv[1]); break; default: fprintf(stderr, "Usage: %s [port]\n", argv[0]); exit(1); } /* Create a stream socket */ if ((sd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { fprintf(stderr, "Can't creat a socket\n"); exit(1); } /* Bind an address to the socket */ bzero((char *)&server, sizeof(struct sockaddr_in)); server.sin_family = AF_INET; server.sin_port = htons(port); server.sin_addr.s_addr = htonl(INADDR_ANY); if (bind(sd, (struct sockaddr *)&server, sizeof(server)) == -1){ fprintf(stderr, "Can't bind name to socket\n"); exit(1); } /* queue up to 5 connect requests */ listen(sd, 5); (void) signal(SIGCHLD, reaper); while(1) { client_len = sizeof(client); new_sd = accept(sd, (struct sockaddr *)&client, &client_len); if(new_sd < 0){ fprintf(stderr, "Can't accept client \n"); exit(1); } switch (fork()){ case 0: /* child */ (void) close(sd); exit(echod(new_sd)); default: /* parent */ (void) close(new_sd); break; case -1: fprintf(stderr, "fork: error\n"); } } } /* echod program */ int echod(int sd) { char *bp, buf[BUFLEN]; int n,.

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TCP file upload server client example

1. Huma Chaudhry ME111012 Nima bahrami ME101004 1 Huma Chaudhry(ME111012), Nima Bahrami(ME101004)

2. Some Important Terms: socket Stream: a host-local, Listen: Server does the Listening at a port for application-created, you OS-controlled interface Port: 65535 ports (a “door”) into which application process can Socket: a door between application both send and process and end-end- receive messages to/from transport protocol another application (UCP or TCP) process Try-Catch Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 2

3. Overview of Client/Server interaction TCP create socket, port=xyz, for incoming request: welcomeSocket = ServerSocket() TCP create socket, wait for incoming connection request connection setup connect to hostid, port=x clientSocket = connectionSocket = welcomeSocket.accept() Socket() send request using read request from clientSocket connectionSocket write reply to connectionSocket read reply from clientSocket close connectionSocket Close req 3 clientSocket Huma Chaudhry(ME111012), Nima Bahrami(ME101004)

4. controlled by controlled by process application application process developer developer socket socket TCP with TCP with controlled by controlled by buffers, operating operating buffers, internet system system variables variables host or host or server server Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 4

5. Networking: Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 5

6. Sneak Peak into the Code Server Side Client Side Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 6

7. Huma Chaudhry(ME111012), Nima Bahrami(ME101004) Socket programming (server) Passive Listening: 7

8. Socket programming (server) Streams of Data to carry data to/from Client: Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 8

9. Socket programming (server) Receiving File from Client: Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 9

10. Socket programming (server) Client Terminating Connection: Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 10

11. Socket programming (server) Server Terminating Connection: Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 11

12. Client Request for Connection:- Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 12

13. Socket programming: Client Client reaching out to Server Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 13

14. Client Communication with Server: Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 14

15. Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 15

16. Client Side: Client Sending File Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 16

17. Client Closing Connection: Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 17

18. Thanks to TCP Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 18

19. Huma Chaudhry(ME111012), Nima Bahrami(ME101004) 19

TCP file upload server client example

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