What is the octet mode in TFTP?

by

In octet mode, data is transferred and stored exactly as-is. In netascii mode, line endings are converted (if needed) on the receiving end to its preferred line-ending (i.e. Newline on Unixes). There is no default as the mode string is always included in the ReadReQuest or WriteReQuest packet.

[edit] Every packet (except the last) sent must contain exactly 512 bytes of data. If a packet contains less (0..511) it signals the end of the file.
The protocol was designed to able to be implemented with a minimum amount of code, so using a fixed-size buffer was anticipated. You could probably come up with a more complicated scheme, but why?

RFC 1350* defines the protocol.

[more]

The “Sorcerer’s Apprentice Syndrome” is protected against by only sending the next block upon timeout or the receipt of the first acknowledgment for a block (any further acknowledgments are silently ignored).

The RFC (see section 7) requires an ERROR packet upon error (including malformed request).

*RFC = “Request for Comments”. RFC 1350 is the latest and official description and standard for the TFTP protocol.

More Related Contents:

  1. Connection refused – tcp socket in linux [closed]
  2. How it works in C? (implement strcat function) [closed]
  3. Memory layout of C program
  4. C non-blocking keyboard input
  5. Retrieve filename from file descriptor in C
  6. Why is malloc not “using up” the memory on my computer?
  7. Is errno thread-safe?
  8. How to capture Control+D signal?
  9. How to know what the ‘errno’ means?
  10. building a .so that is also an executable
  11. What are vdso and vsyscall?
  12. How to get MAC address of your machine using a C program?
  13. How to detect the launching of programs on Linux?
  14. Re-opening stdout and stdin file descriptors after closing them
  15. How to get 100% CPU usage from a C program
  16. Linux: is there a read or recv from socket with timeout?
  17. Are there any platforms where using structure copy on an fd_set (for select() or pselect()) causes problems?
  18. Disable variable-length automatic arrays in gcc
  19. Cannot insert breakpoints. Addresses with low values
  20. Read and write to binary files in C?
  21. When to use pthread condition variables?
  22. How to get file creation date in Linux?
  23. Implementation of sizeof operator
  24. How do you write a C program to execute another program?
  25. Pipes, dup2 and exec()
  26. What API do I call to get the system uptime?
  27. Where are syscalls located in glibc source
  28. Linux function to get mount points
  29. multiple threads able to get flock at the same time
  30. How to know if a Linux system call is restartable or not?

Leave a Comment