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close raw sockets on error

This commit is contained in:
Christian Ulrich 2020-10-10 11:38:53 +02:00
parent 6dff0847b3
commit d9ff4d40cc
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GPG Key ID: 8241BE099775A097
1 changed files with 3 additions and 0 deletions
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3
raw_socket.nim
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@ -53,6 +53,7 @@ proc setupEthernetCapturingSocket*(iface: NetworkInterface): AsyncFD =
if bindAddr(result.SocketHandle, if bindAddr(result.SocketHandle,
cast[ptr SockAddr](addr sa), cast[ptr SockAddr](addr sa),
sizeof(Sockaddr_ll).SockLen) != 0: sizeof(Sockaddr_ll).SockLen) != 0:
closeSocket(result)
raise newException(RawSocketError, "cannot bind to interface") raise newException(RawSocketError, "cannot bind to interface")
# Enable promiscuous mode, see netdevice(7) man page # Enable promiscuous mode, see netdevice(7) man page
@ -62,6 +63,7 @@ proc setupEthernetCapturingSocket*(iface: NetworkInterface): AsyncFD =
PACKET_ADD_MEMBERSHIP.cint, PACKET_ADD_MEMBERSHIP.cint,
addr req, addr req,
sizeof(req).SockLen) != 0: sizeof(req).SockLen) != 0:
closeSocket(result)
raise newException(RawSocketError, "cannot enable promiscuous mode") raise newException(RawSocketError, "cannot enable promiscuous mode")
proc setupTcpInjectingSocket*(): AsyncFD = proc setupTcpInjectingSocket*(): AsyncFD =
@ -74,4 +76,5 @@ proc setupTcpInjectingSocket*(): AsyncFD =
var sockOpt: cint = 1 var sockOpt: cint = 1
if setsockopt(result.SocketHandle, IPPROTO_IP, IP_HDRINCL, addr sockOpt, if setsockopt(result.SocketHandle, IPPROTO_IP, IP_HDRINCL, addr sockOpt,
sizeof(sockOpt).SockLen) != 0: sizeof(sockOpt).SockLen) != 0:
closeSocket(result)
raise newException(RawSocketError, "cannot set IP_HDRINCL option") raise newException(RawSocketError, "cannot set IP_HDRINCL option")