christian
/
punchd
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

nativesockets.IPPROTO_IP is wrong here; use setsockopt instead of setSockOptInt

This commit is contained in:
Christian Ulrich 2020-07-17 00:09:09 +02:00
parent 504445a118
commit 5cc152c039
No known key found for this signature in database
GPG Key ID: 8241BE099775A097
1 changed files with 8 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
raw_socket.nim
View File

@ -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")