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Code Issues Packages Projects Releases 1 Wiki Activity

HTTP server example and DHCP Server rewrite (#38)

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* improvements to dhcpv4 server

* begin adding examples/httpserver

* add better VLAN tagging methods

* pcap: add error printing; fix bug in CRC

* ipv4: ToS and Flags construction and flag manipulation improvements

* add dhcp interception to httptap and improve httpserver example
This commit is contained in:
Pat Whittingslow
2026-02-18 20:48:30 +01:00
committed by GitHub
parent fae4552ddb
commit bf2d07d9f0
12 changed files with 1403 additions and 48 deletions
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examples/httptap/main.go
+24 -4
View File
@@ -9,6 +9,7 @@ import (
"net"
"net/http"
"net/netip"
"strconv"
"strings"
"time"
@@ -61,6 +62,21 @@ func run() error {
iface = br
}
// Wrap interface with DHCP server interceptor.
hwaddr, err := iface.HardwareAddress6()
if err != nil {
return err
}
ipMask, err := iface.IPMask()
if err != nil {
return err
}
svIP := ipMask.Addr().As4()
iface, err = newDHCPInterceptor(iface, svIP, hwaddr, ipMask.Masked())
if err != nil {
return fmt.Errorf("DHCP interceptor: %w", err)
}
sv, err := ltesto.NewHTTPTapServer(iface, flagMinMTU, flagPacketQueueSize, flagPacketQueueSize)
if err != nil {
return err
@@ -72,6 +88,10 @@ func run() error {
}
var pfbuf []byte
sv.OnTransfer(func(channel int, pkt []byte) {
channelstr := "OS"
if channel != 0 {
channelstr = strconv.Itoa(channel) // Will not allocate for values 99 and under (stdlib).
}
captime := time.Now()
frames, err := cap.CaptureEthernet(nil, pkt, 0)
if err == nil {
@@ -79,15 +99,15 @@ func run() error {
pfbuf, err = pf.FormatFrames(pfbuf, frames, pkt)
pfbuf = append(pfbuf, ']')
if err != nil {
fmt.Printf("%d %s !err:%s\n", channel, captime.Format("15:04:05.000"), err)
fmt.Printf("%-2s %s !err:%s\n", channelstr, captime.Format("15:04:05.000"), err)
} else {
fmt.Printf("%d %s %s\n", channel, captime.Format("15:04:05.000"), pfbuf)
fmt.Printf("%-2s %s %s\n", channelstr, captime.Format("15:04:05.000"), pfbuf)
}
} else {
fmt.Println(channel, captime.Format("15:04:05.000"), "cap ERR", frames, err.Error())
fmt.Printf("%-2s %s %s %v %s\n", channelstr, captime.Format("15:04:05.000"), "cap ERR", frames, err.Error())
}
})
hwaddr, err := sv.HardwareAddress6()
hwaddr, err = sv.HardwareAddress6()
if err != nil {
return err
}