syscall: AF_INET/SOCK_PACKET interface doesn't work on Linux

[gopherbot]

by xiezhenye:

The "from" return value of syscall.Recvfrom on a raw socket should not be
SockaddrUnix

What steps reproduce the problem?
sock, _ =  syscall.Socket(syscall.AF_INET, syscall.SOCK_PACKET,
int(htons(syscall.ETH_P_ARP)))
_, from, err := syscall.Recvfrom(sock, buf, 0)

The type of from is SockaddrUnix so that the "from" returned can not used to
syscall.Sendto

[gopherbot]

Comment 1 by xiezhenye:

use SockaddrUnix to syscall.Sendto caused the arg passed to sendto syscall is
AF_FILE，and got a return -1 EINVAL (Invalid argument)

[gopherbot]

Comment 2 by xiezhenye:

use SockaddrUnix to syscall.Sendto caused the arg passed to sendto syscall is
AF_FILE，and got a return -1 EINVAL (Invalid argument)

[mikioh]

Comment 3:

Your code doesn't compile, there's no htons/ntohs-like stuff in Go standard library.
Also your code looks wrong. The obsoleted Linux's AF_INET/SOCK_PACKET access interface
requires struct sockaddr in C, syscall.RawSockaddr in Go. But syscall.Bind requires a
struct that implements syscall.Sockaddr interface for its argument. So, trying to make
AF_INET/SOCK_PACKET socket work in Go is waste of time. Instead, you can use address
family AF_PACKET socket (see attached for the detail), or LSF, PF_RING, other.

Status changed to Invalid.

Attachments:

1. afpacket.go (885 bytes)

[gopherbot]

Comment 4 by xiezhenye:

Thank you. that solves my problem.