bind socket to network interface

by

You can bind to a specific interface by setting SO_BINDTODEVICE socket option.

struct ifreq ifr;

memset(&ifr, 0, sizeof(ifr));
snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "eth0");
if (setsockopt(s, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr)) < 0) {
    ... error handling ...
}

Warning: You have to be root and have the CAP_NET_RAW capability in order to use this option.

The second method is that you can resolv IP address tied to an interface with getifaddrs().

Follow the latter link for a comprehensive example.

More Related Contents:

  1. Connection refused – tcp socket in linux [closed]
  2. What’s the correct answer about getservbyname?
  3. How to set socket timeout in C when making multiple connections?
  4. listen() ignores the backlog argument?
  5. Get IP address of an interface on Linux
  6. Sending file descriptor by Linux socket
  7. Why do we cast sockaddr_in to sockaddr when calling bind()?
  8. Error: Address already in use while binding socket with address but the port number is shown free by `netstat`
  9. Turn a simple socket into an SSL socket
  10. Linux: is there a read or recv from socket with timeout?
  11. Bind failed: Address already in use
  12. Receiving multiple multicast feeds on the same port – C, Linux
  13. Writing to a closed, local TCP socket not failing
  14. Problems with SO_BINDTODEVICE Linux socket option
  15. how to bind raw socket to specific interface
  16. How to use SO_KEEPALIVE option properly to detect that the client at the other end is down?
  17. What can cause a “Resource temporarily unavailable” on sock send() command
  18. What is the difference between AF_INET and PF_INET in socket programming?
  19. What are the flags and macros in a Makefile? [closed]
  20. Working of fork() in linux gcc [duplicate]
  21. Where is PATH_MAX defined in Linux?
  22. Understanding INADDR_ANY for socket programming
  23. Build .so file from .c file using gcc command line
  24. How to solve “ptrace operation not permitted” when trying to attach GDB to a process?
  25. Memory usage of current process in C
  26. What do fully buffered, line buffered and unbuffered mean in C? [closed]
  27. How to set up a cron job to run an executable every hour?
  28. Pipes, dup2 and exec()
  29. How to read terminal’s input buffer immediately after keypress
  30. Can you bind() and connect() both ends of a UDP connection

Leave a Comment