[英]Python raw udp packet not arriving at udp listener
我正在嘗試從原始套接字(在Windows上,如果相關的話)向我的VPS上的udp監聽器發送自定義UDP數據包,但數據包永遠不會出現在它的目的地。
客戶端:import struct import socket
def make_ipv4_header(srcip, dstip, datal, srcprt, dstprt):
srcip = socket.inet_aton(srcip)
dstip = socket.inet_aton(dstip)
ver = 4 #Version 4 for IPv4
ihl = 5 #Header length in 32 bit words. 5 words == 20 bytes
dscp_ecn = 0#Optional fields, don't feel like implementing. Let's keep it at 0
tlen = datal + 28 #Length of data + 20 bytes for ipv4 header + 8 bytes for udp header
ident = socket.htons(54321) #ID of packet
flg_frgoff = 0 #Flags and fragment offset
ttl = 64 #Time to live
ptcl = 17 #Protocol, 17 (UDP)
chksm = 0 #Will automatically fill in checksum
return struct.pack(
"!" #Network(Big endian)
"2B" #Version and IHL, DSCP and ECN
"3H" #Total Length, Identification, Flags and Fragment Offset
"2B" #Time to live, Protocol
"H" #Checksum
"4s" #Source ip
"4s" #Destination ip
, (ver << 4) + ihl, dscp_ecn, tlen, ident, flg_frgoff, ttl, ptcl, chksm, srcip, dstip)
def make_udp_header(srcprt, dstprt, datal):
return struct.pack(
"!4H" #Source port, Destination port, Length, Checksum
, srcprt, dstprt, datal+16, 0)
def makepacket(src, dst, data):
ph = make_ipv4_header(src[0], dst[0], len(data), src[1], dst[1])
uh = make_udp_header(src[1], dst[1], len(data))
return ph+uh+data
s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_RAW)
packet = makepacket(("my ip", 1000), ("vps ip", 10101), "asdf")
s.sendto(packet, ("vps ip", 10101))
服務器:
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(("", 10101))
while True:
msg, addr = s.recvfrom(1024)
print msg, addr
我可以發送一個統一的udp數據包,它會成功到達:
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.sendto("asdf", ("vps ip", 10101))
救命?
在make_udp_header
將數據從+16
更改為+8
。 這似乎對我有用。
改變這幾行
s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_RAW)
packet = makepacket(("my ip", 1000), ("vps ip", 10101), "asdf")
s.sendto(packet, ("vps ip", 10101))
通過
s=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
packet = makepacket(("my ip", 1000), ("vps ip", 10101), "asdf")
s.connect(('vps ip',10101))
s.send(packet)
希望這是你想要的!!
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