3 # Open a raw socket to sniff an interface; output to stdout
5 (signal 2 (fn (x) (exit 0)))
8 (constant 'library "/lib/x86_64-linux-gnu/libc.so.6")
9 (import library "ioctl" "int" "int" "long" "void*" )
10 (import library "perror" "void" "char*" )
11 (import library "fdopen" "void*" "int" "char*" )
12 (import library "setbuf" "void" "void*" "void*" )
13 (import library "ntohs" "int" "int" )
14 (import library "htons" "int" "int" )
15 (import library "inet_addr" "void*" "void*")
16 (import library "socket" "int" "int" "int" "int")
17 (import library "setsockopt" "int" "int" "int" "int" "void*" "int")
18 (import library "perror" "void" "char*")
19 (setf bind-socket (import library "bind" "int" "int" "void*" "int"))
22 (perror (join (map string (args)) " "))
27 (IPPROTO_RAW (htons 0x0800))
31 (SIZEOF_struct_sockaddr 16)
34 (socket AF_INET SOCK_RAW IPPROTO_RAW))
36 (define (bind-to-device FD IFACE)
37 (when (!= (setsockopt FD SOL_SOCKET SO_BINDTODEVICE IFACE (length IFACE)))
38 (die "setsockopt bind"))
39 (when (!= (setsockopt FD SOL_SOCKET SO_BROADCAST (pack "lu" 1) 4))
40 (die "setsockopt broadcast"))
47 (setf IFACE (main-args -1) FD (LIBC6:raw-socket) )
52 (when (!= (LIBC6:bind-to-device FD IFACE))
53 (LIBC6:die "bind-to-device"))
55 (LIBC6:setbuf (LIBC6:fdopen 1 "w") 0)
57 (while (> (setf N (read FD BUFFER 2048)) 0)