![]() ![]() ![]() And we keep on sending the packets until we reach the end of the file. Then it contains the 512 bytes of data which is terminated by '\0'. Each data packet starts with the opcode 03 and then it has 2 bytes containing the block number. If that file exists, then server starts to send the file. This can be changed from utility.h After this, server waits for first request from the client - either RRQ or WRQĪfter a server gets a read request with the filename, then if that file does not exist then, server throws an error packet that file does not exist. This code has been implemented in file tftp_s.cįirstly, a socket is opened on the server side and port 4950 is bound to it. And once client receives error packet, it stops transfering file.Īlso the packet has block size of 2 bytes and we are sending the packet as a string, even then we can transfer as large file because once the block number value crosses the limit, it again initializes to 1. Similarly, read/write priviledges and file not existing errors has been handled, server is responding to them with the proper error code and message. And then for the sample input and differenet TIME_OUT, output on server/client is shown in the next section.Īlso if we are transfering the file to the server which already exists then server will send an ERR packet which stores the message that file already exists. Individual working of the server and client has been explained in the next 2 secions. Also, we can send file of as big size from it. Also, if the ACK is getting lost and not that data packet, then the server won't write that data again to file, it will just send that ACK again. It will try for MAX_TRIES and after that it will drop the connection. Then, if server is not able to send an ACK within TIME_OUT, then client will send the previous data packet again and will wait till it gets the ACK for that packet. Let us suppose client wants to send a file to server. MYPORT: It is the port number of the server MAX_TRIES: These are the maximum number of tries a host will try to send the packet to other host(client/server) ![]() TIME_OUT: It means for how much time host should wait for ACK and after that it will again send the previous packet General Configuration of the program can be changed from utility.h PUT = to send file_name to server_address.GET = to fetch file_name from server_address.$./tftp_c GET/PUT server_address file_name Sample - Sample file which we would PUT/GET to/from server Utility.h - Utility library for the above two programs Tftp_d.c - TFTP Server Side Implementation Tftp_c.c - TFTP Client Side Implementation TFTP(RFC 1350) implementation for Networks Assignment I. ![]()
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