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Tcp rst handling (#40)

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* claude suggests a way forward

* add timing to capture printer

* add pcap.Flags

* fix ICMP CRC calculation and add test

* bugfix: still send data on half-close state(close-wait)

* fix pcap test
This commit is contained in:
Pat Whittingslow
2026-02-23 13:50:13 +01:00
committed by GitHub
parent 08423d0dba
commit 7d323aae19
10 changed files with 386 additions and 46 deletions
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internet/pcap/capture_test.go
+7 -7
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@@ -474,15 +474,15 @@ func ExampleFormatter_dhcp() {
fmt.Println(string(out))
// Output:
// Ethernet len=14; destination=ff:ff:ff:ff:ff:ff; source=de:ad:be:ef:ca:fe; protocol=0x0800
// IPv4 len=20; version=0x04; (Header Length)=5; (Type of Service)=0x00; (Total Length)=312; identification=0x6043; identification=0x6043; flags=0x4000; (Time to live)=0x40; protocol=0x11; checksum=0xd972; source=0.0.0.0; destination=255.255.255.255
// IPv4 len=20; version=0x04; (Header Length)=5; (Type of Service)=0x00; (Total Length)=312; identification=0x6043; flags=0x4000; (Time to live)=0x40; protocol=0x11; checksum=0xd972; source=0.0.0.0; destination=255.255.255.255
// UDP [RFC768] len=8; (Source port)=68; (Destination port)=67; size=292; checksum=0x0000
// DHCPv4 len=240; op=1; (Hardware Address Type)=0x01; (Hardware Address Length)=6; Hops=0x00; (Transaction ID)=0xdeadbeef; (Start Time)=0x0001; Flags=0x0000; (Client Address)=0.0.0.0; (Offered Address)=0.0.0.0; (Server Next Address)=255.255.255.255; (Relay Agent Address)=0.0.0.0; (Client Hardware Address)=de:ad:be:ef:ca:fe; options
// (DHCP message type.)=1
// (Parameter request list)=0x0102031a1c060f2a
// (DHCP maximum message size)=558
// (Requested IP address)=192.168.1.100
// (Client identifier)="lneto-test"
// (Hostname string)="myhost"
// (DHCP message type.)=1
// (Parameter request list)=0x0102031a1c060f2a
// (DHCP maximum message size)=558
// (Requested IP address)=192.168.1.100
// (Client identifier)="lneto-test"
// (Hostname string)="myhost"
}
func writeOpt(dst []byte, opt dhcpv4.OptNum, data ...byte) int {
dst[0] = byte(opt)