From 5cc152c0395e9d4bf29b53b7d4fb4a1cebcb3513 Mon Sep 17 00:00:00 2001
From: Christian Ulrich <christian@ulrich.earth>
Date: Fri, 17 Jul 2020 00:09:09 +0200
Subject: [PATCH] nativesockets.IPPROTO_IP is wrong here; use setsockopt
 instead of setSockOptInt

---
 raw_socket.nim | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/raw_socket.nim b/raw_socket.nim
index 3bca0be..a70a18d 100644
--- a/raw_socket.nim
+++ b/raw_socket.nim
@@ -1,12 +1,10 @@
 import asyncdispatch
 from nativesockets import
   AF_INET,
-  IPPROTO_IP,
   IPPROTO_TCP,
   SOCK_RAW,
   bindAddr,
-  htons,
-  setSockOptInt
+  htons
 from posix import setsockopt, SockAddr, SockLen, SocketHandle
 import network_interface
 
@@ -34,6 +32,7 @@ var
   AF_PACKET {.importc: "AF_PACKET", header: "<sys/socket.h>".}: cushort
   SOL_PACKET {.importc: "SOL_PACKET", header: "<sys/socket.h>".}: cushort
   ETH_P_ALL {.importc: "ETH_P_ALL", header: "<linux/if_ether.h>".}: cushort
+  IPPROTO_IP {.importc: "IPPROTO_IP", header: "<netinet/in.h>".}: cint
   IP_HDRINCL {.importc: "IP_HDRINCL", header: "<netinet/in.h>".}: cint
   PACKET_ADD_MEMBERSHIP {.importc: "PACKET_ADD_MEMBERSHIP", header: "<linux/if_packet.h>".}: cushort
   PACKET_MR_PROMISC {.importc: "PACKET_MR_PROMISC", header: "<linux/if_packet.h>".}: cushort
@@ -70,6 +69,9 @@ proc setupTcpInjectingSocket*(): AsyncFD =
   result = createAsyncNativeSocket(AF_INET.cint, SOCK_RAW.cint,
                                    IPPROTO_TCP.cint)
 
-  # Tell the kernel to not generate an IP header, as we generate it ourselves,
-  # see raw(7) man page.
-  setSockOptInt(result.SocketHandle, IPPROTO_IP.int, IP_HDRINCL, 1)
+  ## Tell the kernel to not generate an IP header, as we generate it ourselves,
+  ## see raw(7) man page.
+  var sockOpt: cint = 1
+  if setsockopt(result.SocketHandle, IPPROTO_IP, IP_HDRINCL, addr sockOpt,
+                sizeof(sockOpt).SockLen) != 0:
+    raise newException(RawSocketError, "cannot set IP_HDRINCL option")