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Questions tagged [tftp]

Trivial File Transfer Protocol (TFTP) is a file transfer protocol notable for its simplicity.

TFTP is a very simple and lightweight file transfer protocol.
It only supports to read and to write files from/to a remote. Even a directory listing is not supported. It is sometimes used to boot devices without data storage or to update firmware.
TFTP is build on top of UDP and using port 69.

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How can I use SIGALRM to abort my server connection?

I am using fork() to implement a TFTP server right now. If my server does not hear from another party for 20s, how can I use SIGALRM to abort the connection? Here is a part of my code: while (1) { pid = fork(); if ( pid == -1 ) { …
Haotian Song
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Old-duplicate data packets in TFTP protocol

I found this question in Book called An Introduction to Computer Networks by Peter L Dordal, and I met with this question which I found it a little bit tricky: In the TFTP protocol: If the client changes its port number on a subsequent connection,…
user8241522
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(Python/TFTP-Server) how to listen to an non (yet) existing IP-address (RNDIS)?

Hy folks, my problem: I want to start a (tftp) server for an non-existing IP-address. the server is meant for USB/RNDIS where its IP-address by nature only is existing when there is actual network-traffic going on -- but I want to start the server…
Jörg
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Incorrect source port (69) in request reply. TFTP sendFile

I'm tring to execute this TFTP DOS send command by TFTP Client in Java: tftp -i 192.168.1.13 put file1.romz file1.romz It means to send the file file1.romz to host: 192.168.1.13, in binary way and rename the file when arrives to file1.romz. About…
Jairo Ernesto Sánchez Galvis
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TFTP Connect Request Failed

I am trying to setup a TFTP server on Windows Server 2012R2 for a university project, and I am running into an issue when trying to GET or PUT anything on the server. The command tftp -i 192.168.2.10 put C:\test.txt on the server itself results in…
Benjamin Dennison
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is the logic behind my trivial tftp client flawed?

I'm still a student so I might have missed something really obvious. So I am stressing out about this so much. But anyway here's my TFTP python code, all it does is downloading a text-file from our lecturer's server. The file generated by it looks…
M B
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Is a software image loaded into non-volatile RAM when using tftpboot from U-boot?

I have a Xilinx development board connected to a RHEL workstation. I have U-boot loaded over JTAG and connect to it with minicom. Then I tftpboot the helloworld standalone application. Where do these images go? I understand I am specifying a…
user_ABCD
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Python NamedTemporaryFile - ValueError When Reading

I am having an issue writing to a NamedTemporaryFile in Python and then reading it back. The function downloads a file via tftpy to the temp file, reads it, hashes the contents, and then compares the hash digest to the original file. The function…
Kin3TiX
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How to check status of connection of a TFTP connection?

I want to check whether or not this connection is made. I am fairly new with node js and tftp so I am not sure how to check the connection. Can i return some kind of status? var tftp= require('tftp'); var client = tftp.createClient({ host:…
lord
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uint16_t in array of char

For a school project, I have to develop a TFTP server in C. I have to build a packet in a array of char like this : 2 bytes 2 bytes n bytes +--------+-----------+--------+ | CODE | Block # | Data | +--------+-----------+--------+ Here…
Mathieu
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Parsing a string of a TFTP packet in C using pointers

I receive TFTP packets (read requests) using recvfrom with a 512 byte buffer. The string (file name to be transfered) starts at the third byte of the buffer. The first two are reserverd for the opcode. I wrote the following function: char *…
paranoidhominid
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recv() function in TFTP

My question is this: During TFTP, when a client connects to a server, the default port for intitial data transmission is port 69. When the server receives a WRQ (write request) packet from the client, it returns an ACK(acknowledgement) packet.…
MDK
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Can't connect to docker published port for tftp

i'm desperately trying to run tftp-hpa in a docker container. I built an image from dockerfile and start it with: docker run -v /tmp:/srv/tftp -d -p 69:69/udp -t tftp_server It's up and running and i can access the server via the virtual docker…
Peter Power
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TFTP boot of a bare-metal program on imx53-QSB

I'm working on a bare-metal program on my imx53-QSB. I wrote de program and build it correctly and succeeded to boot it form the SD card. But now I want to boot using TFTP. I put U-Boot on my SD card, and created my TFTP server on my computer in…
EngineerN
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Detecting incoming port for TFTP data?

I'm working on implementing a TFTP client (UDP socket). Currently I have to switch off the entire firewall on my Windows 8 machine or else the data doesn't reach the TFTP client. The outgoing connect request happens on port 69, but the first data…
user1884325
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