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-rw-r--r--contrib/external-tests/go/main.go22
1 files changed, 20 insertions, 2 deletions
diff --git a/contrib/external-tests/go/main.go b/contrib/external-tests/go/main.go
index 68447fe..ba0e3ac 100644
--- a/contrib/external-tests/go/main.go
+++ b/contrib/external-tests/go/main.go
@@ -16,6 +16,24 @@ import (
"golang.org/x/net/ipv4"
)
+func ipChecksum(buf []byte) uint16 {
+ sum := uint32(0)
+ for ; len(buf) >= 2; buf = buf[2:] {
+ sum += uint32(buf[0])<<8 | uint32(buf[1])
+ }
+ if len(buf) > 0 {
+ sum += uint32(buf[0]) << 8
+ }
+ for sum > 0xffff {
+ sum = (sum >> 16) + (sum & 0xffff)
+ }
+ csum := ^uint16(sum)
+ if csum == 0 {
+ csum = 0xffff
+ }
+ return csum
+}
+
func main() {
ourPrivate, _ := base64.StdEncoding.DecodeString("WAmgVYXkbT2bCtdcDwolI88/iVi/aV3/PHcUBTQSYmo=")
ourPublic, _ := base64.StdEncoding.DecodeString("K5sF9yESrSBsOXPd6TcpKNgqoy1Ik3ZFKl4FolzrRyI=")
@@ -95,12 +113,12 @@ func main() {
Len: ipv4.HeaderLen,
TotalLen: ipv4.HeaderLen + len(pingMessage),
Protocol: 1, // ICMP
- TTL: 2,
- Checksum: 0xa15b, // the packet is always the same, hard-code checksum
+ TTL: 20,
Src: net.IPv4(10, 189, 129, 2),
Dst: net.IPv4(10, 189, 129, 1),
}).Marshal()
binary.BigEndian.PutUint16(pingHeader[2:], uint16(ipv4.HeaderLen+len(pingMessage))) // fix the length endianness on BSDs
+ binary.BigEndian.PutUint16(pingHeader[10:], ipChecksum(append(pingHeader, pingMessage...)))
if err != nil {
panic(err)
}