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dhcpv4.go
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dhcpv4.go
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package main
import (
"encoding/binary"
"encoding/hex"
"encoding/json"
"fmt"
"net"
"sort"
"strconv"
"strings"
"github.com/pyke369/golang-support/rcache"
)
type V4HWTYPE struct {
name string
length int
}
type V4OPTION struct {
id int
mode int
min int
max int
multiple int
}
type V4MSGTYPE struct {
name string
opcode byte
request byte
}
const (
V4MODE_OPCODE = 1
V4MODE_HWTYPE = 2
V4MODE_BINARY = 3
V4MODE_SBINARY = 4
V4MODE_INTEGER = 5
V4MODE_DINTEGER = 6
V4MODE_BOOLEAN = 7
V4MODE_STRING = 8
V4MODE_INET4 = 9
V4MODE_INET4PAIR = 10
V4MODE_CIDR4 = 11
V4MODE_MSGTYPE = 12
V4MODE_OPTION = 13
V4MODE_MASK = 0x7f
V4MODE_LIST = 0x80
)
var (
V4MODE_NAMES = map[int]string{
V4MODE_OPCODE: "opcode",
V4MODE_HWTYPE: "hwtype",
V4MODE_BINARY: "binary",
V4MODE_SBINARY: "sbinary",
V4MODE_INTEGER: "integer",
V4MODE_DINTEGER: "dinteger",
V4MODE_BOOLEAN: "boolean",
V4MODE_STRING: "string",
V4MODE_INET4: "inet4",
V4MODE_INET4PAIR: "inet4pair",
V4MODE_CIDR4: "cidr4",
V4MODE_MSGTYPE: "msgtype",
V4MODE_OPTION: "option",
}
V4OPCODES = map[byte]string{
1: "request",
2: "reply",
}
V4HWTYPES = map[byte]*V4HWTYPE{
1: &V4HWTYPE{"ethernet", 6},
6: &V4HWTYPE{"ieee-802", 0},
7: &V4HWTYPE{"arcnet", 0},
11: &V4HWTYPE{"localtalk", 0},
12: &V4HWTYPE{"localnet", 0},
14: &V4HWTYPE{"smds", 0},
15: &V4HWTYPE{"frame-relay", 0},
16: &V4HWTYPE{"atm", 0},
17: &V4HWTYPE{"hdlc", 0},
18: &V4HWTYPE{"fiber-channel", 0},
19: &V4HWTYPE{"atm", 0},
20: &V4HWTYPE{"serial", 0},
}
V4RHWTYPES = map[string]byte{}
V4MSGTYPES = map[byte]*V4MSGTYPE{
1: &V4MSGTYPE{"discover", 1, 0},
2: &V4MSGTYPE{"offer", 2, 1},
3: &V4MSGTYPE{"request", 1, 0},
4: &V4MSGTYPE{"decline", 1, 0},
5: &V4MSGTYPE{"ack", 2, 3},
6: &V4MSGTYPE{"nak", 2, 3},
7: &V4MSGTYPE{"release", 1, 0},
8: &V4MSGTYPE{"inform", 1, 0},
9: &V4MSGTYPE{"forcerenew", 1, 0},
10: &V4MSGTYPE{"leasequery", 1, 0},
11: &V4MSGTYPE{"leaseunassigned", 2, 10},
12: &V4MSGTYPE{"leaseunknown", 2, 10},
13: &V4MSGTYPE{"leaseactive", 2, 10},
14: &V4MSGTYPE{"bulkleasequery", 1, 0},
15: &V4MSGTYPE{"leasequerydone", 2, 14},
}
V4RMSGTYPES = map[string]byte{}
V4OPTIONS = map[string]*V4OPTION{
"bootp-opcode": &V4OPTION{-14, V4MODE_OPCODE, 1, 1, 0},
"bootp-hardware-type": &V4OPTION{-13, V4MODE_HWTYPE, 1, 1, 0},
"bootp-hardware-length": &V4OPTION{-12, V4MODE_INTEGER, 1, 1, 0},
"bootp-relay-hops": &V4OPTION{-11, V4MODE_INTEGER, 1, 1, 0},
"bootp-transaction-id": &V4OPTION{-10, V4MODE_BINARY, 1, 1, 0},
"bootp-start-time": &V4OPTION{-9, V4MODE_INTEGER, 2, 2, 0},
"bootp-broadcast": &V4OPTION{-8, V4MODE_BOOLEAN, 2, 2, 0},
"bootp-client-address": &V4OPTION{-7, V4MODE_INET4, 4, 4, 0},
"bootp-assigned-address": &V4OPTION{-6, V4MODE_INET4, 4, 4, 0},
"bootp-server-address": &V4OPTION{-5, V4MODE_INET4, 4, 4, 0},
"bootp-relay-address": &V4OPTION{-4, V4MODE_INET4, 4, 4, 0},
"client-hardware-address": &V4OPTION{-3, V4MODE_SBINARY, 6, 6, 0},
"bootp-server-name": &V4OPTION{-2, V4MODE_STRING, 1, 63, 0},
"bootp-filename": &V4OPTION{-1, V4MODE_STRING, 1, 127, 0},
"subnet-mask": &V4OPTION{1, V4MODE_INET4, 4, 4, 0},
"time-offset": &V4OPTION{2, V4MODE_INTEGER, 4, 4, 0},
"routers": &V4OPTION{3, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"time-servers": &V4OPTION{4, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"name-servers": &V4OPTION{5, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"domain-name-servers": &V4OPTION{6, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"log-servers": &V4OPTION{7, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"cookie-servers": &V4OPTION{8, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"lpr-servers": &V4OPTION{9, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"impress-servers": &V4OPTION{10, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"resource-location-servers": &V4OPTION{11, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"hostname": &V4OPTION{12, V4MODE_STRING, 1, 0, 0},
"boot-file-size": &V4OPTION{13, V4MODE_INTEGER, 2, 2, 0},
"merit-dump-file": &V4OPTION{14, V4MODE_STRING, 1, 0, 0},
"domain-name": &V4OPTION{15, V4MODE_STRING, 1, 0, 0},
"swap-server": &V4OPTION{16, V4MODE_INET4, 4, 4, 0},
"root-path": &V4OPTION{17, V4MODE_STRING, 1, 0, 0},
"extensions-path": &V4OPTION{18, V4MODE_STRING, 1, 0, 0},
"ip-forwarding": &V4OPTION{19, V4MODE_BOOLEAN, 1, 1, 0},
"non-local-source-routing": &V4OPTION{20, V4MODE_BOOLEAN, 1, 1, 0},
"policy-filters": &V4OPTION{21, V4MODE_CIDR4 | V4MODE_LIST, 8, 0, 8},
"maximum-datagram-reassembly-size": &V4OPTION{22, V4MODE_INTEGER, 2, 2, 0},
"ip-default-ttl": &V4OPTION{23, V4MODE_INTEGER, 1, 1, 0},
"path-mtu-aging-timeout": &V4OPTION{24, V4MODE_INTEGER, 4, 4, 0},
"path-mtu-plateau-table": &V4OPTION{25, V4MODE_INTEGER | V4MODE_LIST, 2, 0, 2},
"interface-mtu": &V4OPTION{26, V4MODE_INTEGER, 2, 2, 0},
"all-subnets-local": &V4OPTION{27, V4MODE_BOOLEAN, 1, 1, 0},
"broadcast-address": &V4OPTION{28, V4MODE_INET4, 4, 4, 0},
"perform-mask-discovery": &V4OPTION{29, V4MODE_BOOLEAN, 1, 1, 0},
"mask-supplier": &V4OPTION{30, V4MODE_BOOLEAN, 1, 1, 0},
"perform-router-discovery": &V4OPTION{31, V4MODE_BOOLEAN, 1, 1, 0},
"router-solicitation-address": &V4OPTION{32, V4MODE_INET4, 4, 4, 0},
"static-routes": &V4OPTION{33, V4MODE_INET4PAIR | V4MODE_LIST, 8, 0, 8},
"trailer-encapsulation": &V4OPTION{34, V4MODE_BOOLEAN, 1, 1, 0},
"arp-cache-timeout": &V4OPTION{35, V4MODE_INTEGER, 4, 4, 0},
"ethernet-encapsulation": &V4OPTION{36, V4MODE_BOOLEAN, 1, 1, 0},
"tcp-default-ttl": &V4OPTION{37, V4MODE_INTEGER, 1, 1, 0},
"tcp-keepalive-interval": &V4OPTION{38, V4MODE_INTEGER, 4, 4, 0},
"tcp-keepalive-garbage": &V4OPTION{39, V4MODE_BOOLEAN, 1, 1, 0},
"nis-domain": &V4OPTION{40, V4MODE_STRING, 1, 0, 0},
"nis-servers": &V4OPTION{41, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"ntp-servers": &V4OPTION{42, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"vendor-specific-information": &V4OPTION{43, V4MODE_BINARY, 1, 0, 0},
"netbios-name-servers": &V4OPTION{44, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"netbios-dgram-distribution-servers": &V4OPTION{45, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"netbios-node-type": &V4OPTION{46, V4MODE_INTEGER, 1, 1, 0},
"netbios-scope": &V4OPTION{47, V4MODE_STRING, 1, 0, 0},
"xwindow-font-servers": &V4OPTION{48, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"xwindow-display-managers": &V4OPTION{49, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"requested-ip-address": &V4OPTION{50, V4MODE_INET4, 4, 4, 0},
"address-lease-time": &V4OPTION{51, V4MODE_INTEGER, 4, 4, 0},
"option-overload": &V4OPTION{52, V4MODE_INTEGER, 1, 1, 0},
"dhcp-message-type": &V4OPTION{53, V4MODE_MSGTYPE, 1, 1, 0},
"server-identifier": &V4OPTION{54, V4MODE_INET4, 4, 4, 0},
"parameters-request-list": &V4OPTION{55, V4MODE_OPTION | V4MODE_LIST, 1, 0, 1},
"message": &V4OPTION{56, V4MODE_STRING, 1, 0, 0},
"max-message-size": &V4OPTION{57, V4MODE_INTEGER, 2, 2, 0},
"renewal-time": &V4OPTION{58, V4MODE_INTEGER, 4, 4, 0},
"rebinding-time": &V4OPTION{59, V4MODE_INTEGER, 4, 4, 0},
"vendor-class-identifier": &V4OPTION{60, V4MODE_STRING, 1, 0, 0},
"client-identifier": &V4OPTION{61, V4MODE_BINARY, 2, 0, 0},
"netware-domain": &V4OPTION{62, V4MODE_STRING, 1, 0, 0},
"netware-option": &V4OPTION{63, V4MODE_BINARY, 1, 0, 0},
"nisplus-domain": &V4OPTION{64, V4MODE_STRING, 1, 0, 0},
"nisplus-servers": &V4OPTION{65, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"tftp-server-name": &V4OPTION{66, V4MODE_STRING, 1, 0, 0},
"boot-filename": &V4OPTION{67, V4MODE_STRING, 1, 0, 0},
"mobile-ip-home-agents": &V4OPTION{68, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"smtp-servers": &V4OPTION{69, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"pop3-servers": &V4OPTION{70, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"nntp-servers": &V4OPTION{71, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"www-servers": &V4OPTION{72, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"finger-servers": &V4OPTION{73, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"irc-servers": &V4OPTION{74, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"streettalk-servers": &V4OPTION{75, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"streettalk-directory-servers": &V4OPTION{76, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"user-class": &V4OPTION{77, V4MODE_STRING, 1, 0, 0},
"directory-agent": &V4OPTION{78, V4MODE_BINARY, 1, 0, 0},
"service-scope": &V4OPTION{79, V4MODE_BINARY, 1, 0, 0},
"client-fqdn": &V4OPTION{81, V4MODE_BINARY, 1, 0, 0},
"relay-agent-information": &V4OPTION{82, V4MODE_BINARY, 1, 0, 0},
"isns-configuration": &V4OPTION{83, V4MODE_BINARY, 1, 0, 0},
"nds-servers": &V4OPTION{85, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"nds-tree-name": &V4OPTION{86, V4MODE_STRING, 1, 0, 0},
"nds-context": &V4OPTION{87, V4MODE_STRING, 1, 0, 0},
"bcmcs-domain": &V4OPTION{88, V4MODE_STRING, 1, 0, 0},
"bcmcs-servers": &V4OPTION{89, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"authentication": &V4OPTION{90, V4MODE_BINARY, 3, 0, 0},
"last-transaction-time": &V4OPTION{91, V4MODE_INTEGER, 4, 4, 0},
"associated-addresses": &V4OPTION{92, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"client-system": &V4OPTION{93, V4MODE_INTEGER, 2, 2, 0},
"client-ndi": &V4OPTION{94, V4MODE_DINTEGER, 3, 3, 0},
"client-guid": &V4OPTION{97, V4MODE_BINARY, 1, 0, 0},
"user-authentication": &V4OPTION{98, V4MODE_STRING, 1, 0, 0},
"geoconf-civic": &V4OPTION{99, V4MODE_BINARY, 1, 0, 0},
"tz-posix": &V4OPTION{100, V4MODE_STRING, 1, 0, 0},
"tz-database": &V4OPTION{101, V4MODE_STRING, 1, 0, 0},
"auto-configuration": &V4OPTION{116, V4MODE_INTEGER, 1, 1, 0},
"name-service-search": &V4OPTION{117, V4MODE_INTEGER | V4MODE_LIST, 2, 0, 2},
"subnet-selection": &V4OPTION{118, V4MODE_INET4, 4, 4, 0},
"domain-search": &V4OPTION{119, V4MODE_STRING, 1, 0, 0},
"sip-server": &V4OPTION{120, V4MODE_BINARY, 1, 0, 0},
"classless-route": &V4OPTION{121, V4MODE_BINARY, 1, 0, 0},
"cablelabs-configuration": &V4OPTION{122, V4MODE_BINARY, 1, 0, 0},
"geoconf": &V4OPTION{123, V4MODE_BINARY, 1, 0, 0},
"vi-vendor-class": &V4OPTION{124, V4MODE_BINARY, 1, 0, 0},
"vi-vendor-specific-information": &V4OPTION{125, V4MODE_BINARY, 1, 0, 0},
"pana-agents": &V4OPTION{136, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"v4-lost": &V4OPTION{137, V4MODE_STRING, 1, 0, 0},
"v4-capwap-access-controller": &V4OPTION{138, V4MODE_BINARY, 1, 0, 0},
"v4-address-mos": &V4OPTION{139, V4MODE_BINARY, 1, 0, 0},
"v4-fqdn-mos": &V4OPTION{140, V4MODE_BINARY, 1, 0, 0},
"sip-ua-domain": &V4OPTION{141, V4MODE_STRING, 1, 0, 0},
"v4-address-andsf": &V4OPTION{142, V4MODE_BINARY, 1, 0, 0},
"v4-geoloc": &V4OPTION{144, V4MODE_BINARY, 1, 0, 0},
"forcerenew-nonce-capable": &V4OPTION{145, V4MODE_BINARY, 1, 0, 0},
"rdnss-selection": &V4OPTION{146, V4MODE_BINARY, 1, 0, 0},
"tftp-servers": &V4OPTION{150, V4MODE_INET4 | V4MODE_LIST, 4, 0, 4},
"status-code": &V4OPTION{151, V4MODE_STRING, 1, 0, 0},
"base-time": &V4OPTION{152, V4MODE_INTEGER, 4, 4, 0},
"start-time-of-state": &V4OPTION{153, V4MODE_INTEGER, 4, 4, 0},
"query-start-time": &V4OPTION{154, V4MODE_INTEGER, 4, 4, 0},
"query-end-time": &V4OPTION{155, V4MODE_INTEGER, 4, 4, 0},
"dhcp-state": &V4OPTION{156, V4MODE_INTEGER, 1, 1, 0},
"data-source": &V4OPTION{157, V4MODE_INTEGER, 1, 1, 0},
"v4-pcp-server": &V4OPTION{158, V4MODE_BINARY, 5, 0, 0},
"pxelinux-magic": &V4OPTION{208, V4MODE_BINARY, 4, 4, 0},
"configuration-file": &V4OPTION{209, V4MODE_STRING, 1, 0, 0},
"path-prefix": &V4OPTION{210, V4MODE_STRING, 1, 0, 0},
"reboot-time": &V4OPTION{211, V4MODE_INTEGER, 4, 4, 0},
"v6-6rd": &V4OPTION{212, V4MODE_BINARY, 1, 0, 0},
"v4-access-domain": &V4OPTION{213, V4MODE_STRING, 1, 0, 0},
"subnet-allocation": &V4OPTION{220, V4MODE_BINARY, 1, 0, 0},
"virtual-subnet-allocation": &V4OPTION{221, V4MODE_BINARY, 1, 0, 0},
"private-01": &V4OPTION{224, V4MODE_BINARY, 1, 0, 0},
"private-02": &V4OPTION{225, V4MODE_BINARY, 1, 0, 0},
"private-03": &V4OPTION{226, V4MODE_BINARY, 1, 0, 0},
"private-04": &V4OPTION{227, V4MODE_BINARY, 1, 0, 0},
"private-05": &V4OPTION{228, V4MODE_BINARY, 1, 0, 0},
"private-06": &V4OPTION{229, V4MODE_BINARY, 1, 0, 0},
"private-07": &V4OPTION{230, V4MODE_BINARY, 1, 0, 0},
"private-08": &V4OPTION{231, V4MODE_BINARY, 1, 0, 0},
"private-09": &V4OPTION{232, V4MODE_BINARY, 1, 0, 0},
"private-10": &V4OPTION{233, V4MODE_BINARY, 1, 0, 0},
"private-11": &V4OPTION{234, V4MODE_BINARY, 1, 0, 0},
"private-12": &V4OPTION{235, V4MODE_BINARY, 1, 0, 0},
"private-13": &V4OPTION{236, V4MODE_BINARY, 1, 0, 0},
"private-14": &V4OPTION{237, V4MODE_BINARY, 1, 0, 0},
"private-15": &V4OPTION{238, V4MODE_BINARY, 1, 0, 0},
"private-16": &V4OPTION{239, V4MODE_BINARY, 1, 0, 0},
"private-17": &V4OPTION{240, V4MODE_BINARY, 1, 0, 0},
"private-18": &V4OPTION{241, V4MODE_BINARY, 1, 0, 0},
"private-19": &V4OPTION{242, V4MODE_BINARY, 1, 0, 0},
"private-20": &V4OPTION{243, V4MODE_BINARY, 1, 0, 0},
"private-21": &V4OPTION{244, V4MODE_BINARY, 1, 0, 0},
"private-22": &V4OPTION{245, V4MODE_BINARY, 1, 0, 0},
"private-23": &V4OPTION{246, V4MODE_BINARY, 1, 0, 0},
"private-24": &V4OPTION{247, V4MODE_BINARY, 1, 0, 0},
"private-25": &V4OPTION{248, V4MODE_BINARY, 1, 0, 0},
"private-26": &V4OPTION{249, V4MODE_BINARY, 1, 0, 0},
"private-27": &V4OPTION{250, V4MODE_BINARY, 1, 0, 0},
"private-28": &V4OPTION{251, V4MODE_BINARY, 1, 0, 0},
"private-29": &V4OPTION{252, V4MODE_BINARY, 1, 0, 0},
"private-30": &V4OPTION{253, V4MODE_BINARY, 1, 0, 0},
"private-31": &V4OPTION{254, V4MODE_BINARY, 1, 0, 0},
}
V4ROPTIONS = map[int]string{}
)
func init() {
for id, hwtype := range V4HWTYPES {
V4RHWTYPES[hwtype.name] = id
}
for id, msgtype := range V4MSGTYPES {
V4RMSGTYPES[msgtype.name] = id
}
for name, option := range V4OPTIONS {
V4ROPTIONS[option.id] = name
}
}
func v4options(marshal bool) {
if marshal {
options := map[string]interface{}{}
for name, option := range V4OPTIONS {
options[name] = map[string]interface{}{"id": option.id, "mode": V4MODE_NAMES[option.mode&V4MODE_MASK], "list": option.mode&V4MODE_LIST != 0}
}
if content, err := json.Marshal(options); err == nil {
fmt.Printf("%s\n", content)
}
return
}
fmt.Printf("option type id\n")
fmt.Printf("--------------------------------------- --------------------------------------- ---\n")
ids := []int{}
for id, _ := range V4ROPTIONS {
ids = append(ids, id)
}
sort.Ints(ids)
for _, id := range ids {
name := V4ROPTIONS[id]
option := V4OPTIONS[name]
mode, plural := "", "s"
switch option.mode & V4MODE_MASK {
case V4MODE_BINARY:
mode = "hex-encoded blob"
case V4MODE_SBINARY:
mode = "colon-separated hex-encoded blob"
case V4MODE_INTEGER:
mode = fmt.Sprintf("%dbits integer", 8*option.min)
case V4MODE_DINTEGER:
mode = "dotted-integer (version)"
case V4MODE_BOOLEAN:
mode = "boolean"
case V4MODE_STRING:
mode = "string"
case V4MODE_INET4:
mode, plural = "IPv4 address", "es"
case V4MODE_INET4PAIR:
mode = "IPv4 addresses pair"
case V4MODE_CIDR4:
mode = "IPv4 CIDR block"
case V4MODE_OPCODE:
mode = "BOOTP opcode"
case V4MODE_HWTYPE:
mode = "hardware address type"
case V4MODE_MSGTYPE:
mode = "DHCP message type"
case V4MODE_OPTION:
mode = "DHCP option"
}
fmt.Printf("%-40.40s", name)
if option.mode&V4MODE_LIST != 0 {
fmt.Printf("%-40.40s", fmt.Sprintf("%s%s list", mode, plural))
} else {
fmt.Printf("%-40.40s", mode)
}
if option.id > 0 {
fmt.Printf("%d", option.id)
} else {
fmt.Printf("-")
}
fmt.Printf("\n")
}
}
func v4parse(packet []byte) (frame FRAME, err error) {
frame = FRAME{}
if len(packet) < 240 {
return nil, fmt.Errorf(`invalid packet size %d`, len(packet))
}
if opcode := V4OPCODES[packet[0]]; opcode == "" {
return nil, fmt.Errorf(`invalid opcode 0x%02x`, packet[0])
} else {
if hwtype := V4HWTYPES[packet[1]]; hwtype == nil || int(packet[2]) > 16 || (hwtype.length != 0 && int(packet[2]) != hwtype.length) {
return nil, fmt.Errorf(`invalid hardware address type 0x%02x`, packet[1])
} else {
frame["bootp-opcode"] = opcode
frame["bootp-hardware-type"] = hwtype.name
frame["bootp-hardware-length"] = hwtype.length
}
}
frame["bootp-relay-hops"] = int(packet[3])
frame["bootp-transaction-id"] = fmt.Sprintf("%08x", binary.BigEndian.Uint32(packet[4:]))
frame["bootp-start-time"] = int(binary.BigEndian.Uint16(packet[8:]))
frame["bootp-broadcast"] = packet[10]&0x80 != 0
if value := binary.BigEndian.Uint32(packet[12:]); value != 0 {
frame["bootp-client-address"] = fmt.Sprintf("%d.%d.%d.%d", byte(value>>24), byte(value>>16), byte(value>>8), byte(value))
}
if value := binary.BigEndian.Uint32(packet[16:]); value != 0 {
frame["bootp-assigned-address"] = fmt.Sprintf("%d.%d.%d.%d", byte(value>>24), byte(value>>16), byte(value>>8), byte(value))
}
if value := binary.BigEndian.Uint32(packet[20:]); value != 0 {
frame["bootp-server-address"] = fmt.Sprintf("%d.%d.%d.%d", byte(value>>24), byte(value>>16), byte(value>>8), byte(value))
}
if value := binary.BigEndian.Uint32(packet[24:]); value != 0 {
frame["bootp-relay-address"] = fmt.Sprintf("%d.%d.%d.%d", byte(value>>24), byte(value>>16), byte(value>>8), byte(value))
}
frame["client-hardware-address"] = strings.ReplaceAll(fmt.Sprintf("% x", packet[28:28+frame["bootp-hardware-length"].(int)]), " ", ":")
offset := 44
if packet[offset] != 0 {
for ; offset < 107; offset++ {
if packet[offset] == 0 {
break
}
}
frame["bootp-server-name"] = fmt.Sprintf("%s", packet[44:offset])
}
offset = 108
if packet[offset] != 0 {
for ; offset < 235; offset++ {
if packet[offset] == 0 {
break
}
}
frame["bootp-filename"] = fmt.Sprintf("%s", packet[108:offset])
}
if value := binary.BigEndian.Uint32(packet[236:]); value != 0x63825363 {
return frame, nil
}
offset = 240
loop:
for offset < len(packet) {
switch packet[offset] {
case 0:
offset++
case 0xff:
break loop
default:
name := V4ROPTIONS[int(packet[offset])]
if name == "" {
name = fmt.Sprintf("%d", packet[offset])
}
option := V4OPTIONS[name]
if option == nil {
option = &V4OPTION{int(packet[offset]), V4MODE_BINARY, 1, 0, 0}
}
size := int(packet[offset+1])
if size < option.min || (option.max != 0 && size > option.max) && (option.multiple != 0 && size%option.multiple != 0) {
return nil, fmt.Errorf(`invalid size %d for option "%s"`, size, name)
}
if offset+2+size <= len(packet) {
frame[name] = 0
if option.mode&V4MODE_LIST != 0 {
frame[name] = []interface{}{}
}
for index := offset + 2; index < offset+2+size; {
var value interface{}
switch option.mode & V4MODE_MASK {
case V4MODE_BINARY:
value = fmt.Sprintf("%x", packet[index:index+size])
case V4MODE_SBINARY:
value = strings.ReplaceAll(fmt.Sprintf("% x", packet[index:index+size]), " ", ":")
case V4MODE_INTEGER:
switch option.min {
case 1:
value = int(packet[index])
case 2:
value = int(binary.BigEndian.Uint16(packet[index:]))
case 4:
value = int(binary.BigEndian.Uint32(packet[index:]))
case 8:
value = int(binary.BigEndian.Uint64(packet[index:]))
default:
return nil, fmt.Errorf(`invalid integer length %d for option "%s"`, option.min, name)
}
case V4MODE_DINTEGER:
dinteger := ""
for position := index; position < index+size; position++ {
dinteger += fmt.Sprintf("%d.", packet[position])
}
value = strings.Trim(dinteger, ".")
case V4MODE_BOOLEAN:
value = packet[index] != 0
case V4MODE_STRING:
value = fmt.Sprintf("%s", packet[offset+2:offset+2+size])
case V4MODE_INET4:
address := binary.BigEndian.Uint32(packet[index:])
value = fmt.Sprintf("%d.%d.%d.%d", byte(address>>24), byte(address>>16), byte(address>>8), byte(address))
case V4MODE_INET4PAIR:
address1 := binary.BigEndian.Uint32(packet[index:])
address2 := binary.BigEndian.Uint32(packet[index+4:])
value = fmt.Sprintf("%d.%d.%d.%d:%d.%d.%d.%d",
byte(address1>>24), byte(address1>>16), byte(address1>>8), byte(address1),
byte(address2>>24), byte(address2>>16), byte(address2>>8), byte(address2))
case V4MODE_CIDR4:
address, bmask := binary.BigEndian.Uint32(packet[index:]), binary.BigEndian.Uint32(packet[index+4:])
mask := net.IPv4Mask(byte(bmask>>24), byte(bmask>>16), byte(bmask>>8), byte(bmask))
size, _ := mask.Size()
value = fmt.Sprintf("%d.%d.%d.%d/%d", byte(address>>24), byte(address>>16), byte(address>>8), byte(address), size)
case V4MODE_MSGTYPE:
if msgtype := V4MSGTYPES[packet[index]]; msgtype == nil {
return nil, fmt.Errorf(`invalid message type 0x%02x`, packet[index])
} else {
value = msgtype.name
}
case V4MODE_OPTION:
if value = V4ROPTIONS[int(packet[index])]; value == "" {
value = fmt.Sprintf("%d", packet[index])
}
}
if value == nil {
return nil, fmt.Errorf(`invalid value for option "%s"`, name)
}
if option.mode&V4MODE_LIST != 0 {
index += option.multiple
frame[name] = append(frame[name].([]interface{}), value)
} else {
index += size
frame[name] = value
}
}
}
offset += 2 + size
}
}
if frame["dhcp-message-type"] == nil {
frame["dhcp-message-type"] = "request"
}
return frame, nil
}
func v4key(frame FRAME) string {
key := ""
if value, ok := frame["client-hardware-address"].(string); ok {
key += strings.ReplaceAll(value, ":", "")
}
if value, ok := frame["bootp-transaction-id"].(string); ok {
key += value
}
if value, ok := frame["dhcp-message-type"].(string); ok && V4RMSGTYPES[value] != 0 {
if request := V4MSGTYPES[V4RMSGTYPES[value]].request; request != 0 {
key += fmt.Sprintf("%02x", request)
} else {
key += fmt.Sprintf("%02x", V4RMSGTYPES[value])
}
} else {
key += "01"
}
return key
}
func v4build(frame FRAME) (packet []byte, err error) {
packet = make([]byte, 4<<10)
dhcp := true
if value, ok := frame["dhcp-message-type"].(string); !ok || value == "" {
frame["dhcp-message-type"] = "request"
dhcp = false
}
if value := V4RMSGTYPES[frame["dhcp-message-type"].(string)]; value != 0 {
packet[0] = V4MSGTYPES[value].opcode
} else {
return nil, fmt.Errorf(`invalid message type "%v"`, frame["dhcp-message-type"])
}
if value, ok := frame["bootp-hardware-type"].(string); !ok || value == "" {
frame["bootp-hardware-type"] = "ethernet"
}
if value, ok := frame["bootp-hardware-length"].(float64); ok {
frame["bootp-hardware-length"] = int(value)
}
if value := V4RHWTYPES[frame["bootp-hardware-type"].(string)]; value != 0 {
packet[1] = value
if length := V4HWTYPES[value].length; length != 0 {
packet[2] = byte(length)
} else if value, ok := frame["bootp-hardware-length"].(int); ok && value <= 16 {
packet[2] = byte(value)
}
} else {
return nil, fmt.Errorf(`invalid hardware address type "%v"`, frame["bootp-hardware-type"])
}
if value, ok := frame["bootp-relay-hops"].(float64); ok {
frame["bootp-relay-hops"] = int(value)
}
if value, ok := frame["bootp-relay-hops"].(int); ok {
packet[3] = byte(value)
}
if value, ok := frame["bootp-transaction-id"].(string); ok && len(value) == 8 {
if id, err := hex.DecodeString(value); err == nil {
copy(packet[4:], id)
} else {
return nil, fmt.Errorf(`invalid transaction id "%v"`, frame)
}
}
if value, ok := frame["bootp-start-time"].(int); ok {
binary.BigEndian.PutUint16(packet[8:], uint16(value))
}
if value, ok := frame["bootp-broadcast"].(bool); ok && value {
packet[10] |= 0x80
}
if value, ok := frame["bootp-client-address"].(string); ok {
if address := net.ParseIP(value); address != nil && address.To4() != nil {
copy(packet[12:], address.To4()[:4])
} else {
return nil, fmt.Errorf(`invalid client address "%v"`, address)
}
}
if value, ok := frame["bootp-assigned-address"].(string); ok {
if address := net.ParseIP(value); address != nil && address.To4() != nil {
copy(packet[16:], address.To4()[:4])
} else {
return nil, fmt.Errorf(`invalid assigned address "%v"`, address)
}
}
if value, ok := frame["bootp-server-address"].(string); ok {
if address := net.ParseIP(value); address != nil && address.To4() != nil {
copy(packet[20:], address.To4()[:4])
} else {
return nil, fmt.Errorf(`invalid server address "%v"`, address)
}
}
if value, ok := frame["bootp-relay-address"].(string); ok {
if address := net.ParseIP(value); address != nil && address.To4() != nil {
copy(packet[24:], address.To4()[:4])
} else {
return nil, fmt.Errorf(`invalid relay address "%v"`, address)
}
}
if value, ok := frame["client-hardware-address"].(string); ok {
if matcher := rcache.Get(fmt.Sprintf("^([0-9a-f][0-9a-f]:){%d}[0-9a-f][0-9a-f]$", packet[2]-1)); matcher == nil || !matcher.MatchString(value) {
return nil, fmt.Errorf(`invalid hardware address "%s"`, value)
} else {
hex.Decode(packet[28:], []byte(strings.ReplaceAll(value, ":", "")))
}
}
if value, ok := frame["bootp-server-name"].(string); ok && len(value) > 0 {
copy(packet[44:107], value)
}
if value, ok := frame["bootp-filename"].(string); ok && len(value) > 0 {
copy(packet[108:235], value)
}
if !dhcp {
return packet[:300], nil
}
binary.BigEndian.PutUint32(packet[236:], 0x63825363)
offset := 240
for name, value := range frame {
var option *V4OPTION = nil
id := 0
if id, _ = strconv.Atoi(name); id > 0 && id <= 254 {
for oname, option := range V4OPTIONS {
if id == option.id {
name = oname
break
}
}
}
if option = V4OPTIONS[name]; option != nil {
if option.id < 1 {
continue
}
} else if id != 0 {
option = &V4OPTION{id, V4MODE_BINARY, 1, 0, 0}
}
if option == nil {
continue
}
if _, ok := value.([]interface{}); !ok {
value = []interface{}{value}
}
if option.mode&V4MODE_LIST == 0 && len(value.([]interface{})) > 1 {
return nil, fmt.Errorf(`option "%s" is not a list of values`, name)
}
if offset >= len(packet)-256 {
return nil, fmt.Errorf(`packet size exceeded`)
}
packet[offset] = byte(option.id)
size := 0
for _, item := range value.([]interface{}) {
if _, ok := item.(float64); ok {
item = int(item.(float64))
}
switch option.mode & V4MODE_MASK {
case V4MODE_BINARY:
if tvalue, ok := item.(string); ok && tvalue != "" {
if matcher := rcache.Get(fmt.Sprintf(`^([0-9a-f][0-9a-f]){1,%d}$`, 254-size)); matcher == nil || !matcher.MatchString(tvalue) {
return nil, fmt.Errorf(`invalid format "%v" for binary option "%s"`, item, name)
} else {
hex.Decode(packet[offset+2+size:], []byte(tvalue))
size += len(tvalue) / 2
}
} else {
return nil, fmt.Errorf(`invalid format "%v" for binary option "%s"`, item, name)
}
case V4MODE_SBINARY:
if tvalue, ok := item.(string); ok && tvalue != "" {
if matcher := rcache.Get(fmt.Sprintf(`^([0-9a-f][0-9a-f]:){0,%d}[0-9a-f][0-9a-f]$`, 253-size)); matcher == nil || !matcher.MatchString(tvalue) {
return nil, fmt.Errorf(`invalid format "%v" for separated-binary option "%s"`, item, name)
} else {
tvalue = strings.ReplaceAll(tvalue, ":", "")
hex.Decode(packet[offset+2+size:], []byte(tvalue))
size += len(tvalue) / 2
}
} else {
return nil, fmt.Errorf(`invalid format "%v" for separated-binary option "%s"`, item, name)
}
case V4MODE_INTEGER:
if tvalue, ok := item.(string); ok {
if tvalue, err := strconv.Atoi(tvalue); err == nil {
item = tvalue
}
}
if tvalue, ok := item.(int); ok {
switch option.min {
case 1:
packet[offset+2+size] = byte(tvalue)
case 2:
binary.BigEndian.PutUint16(packet[offset+2+size:], uint16(tvalue))
case 4:
binary.BigEndian.PutUint32(packet[offset+2+size:], uint32(tvalue))
case 8:
binary.BigEndian.PutUint64(packet[offset+2+size:], uint64(tvalue))
default:
return nil, fmt.Errorf(`invalid length %d for integer option "%s"`, option.min, name)
}
size += option.min
} else {
return nil, fmt.Errorf(`invalid format "%v" for integer option "%s"`, item, name)
}
case V4MODE_DINTEGER:
if tvalue, ok := item.(string); ok && tvalue != "" {
if matcher := rcache.Get(fmt.Sprintf(`^(\d+\.){0,%d}\d+$`, 253-size)); matcher == nil || !matcher.MatchString(tvalue) {
return nil, fmt.Errorf(`invalid format "%v" for dotted-integer option "%s"`, item, name)
} else {
for _, integer := range strings.Split(tvalue, ".") {
value, _ := strconv.Atoi(integer)
packet[offset+2+size] = byte(value)
size++
}
}
} else {
return nil, fmt.Errorf(`invalid format "%v" for dotted-integer option "%s"`, item, name)
}
case V4MODE_BOOLEAN:
if tvalue, ok := item.(string); ok {
item = false
if value = strings.ToLower(strings.TrimSpace(tvalue)); value == "1" || value == "on" || value == "yes" || value == "true" {
item = true
}
}
if tvalue, ok := item.(bool); ok {
if tvalue {
packet[offset+2+size] = 1
}
size++
} else {
return nil, fmt.Errorf(`invalid format "%v" for boolean option "%s"`, item, name)
}
case V4MODE_STRING:
if tvalue, ok := item.(string); ok && tvalue != "" && len(tvalue) <= 254 {
copy(packet[offset+2+size:], tvalue)
size += len(tvalue)
} else {
return nil, fmt.Errorf(`invalid format "%v" for string option "%s"`, item, name)
}
case V4MODE_INET4:
if tvalue, ok := item.(string); ok {
if address := net.ParseIP(tvalue); address == nil || address.To4() == nil {
return nil, fmt.Errorf(`invalid format "%v" for inet4 option "%s"`, item, name)
} else {
copy(packet[offset+2+size:], address.To4()[:4])
size += 4
}
} else {
return nil, fmt.Errorf(`invalid format "%v" for inet4 option "%s"`, item, name)
}
case V4MODE_INET4PAIR:
if tvalue, ok := item.(string); ok {
if matcher := rcache.Get(`^((?:\d+\.){3}\d+):((?:\d+\.){3}\d+)$`); matcher == nil || !matcher.MatchString(tvalue) {
return nil, fmt.Errorf(`invalid format "%v" for inet4pair option "%s"`, item, name)
} else {
matches := matcher.FindStringSubmatch(tvalue)
if address1 := net.ParseIP(matches[1]); address1 == nil || address1.To4() == nil {
return nil, fmt.Errorf(`invalid format "%v" for inet4pair option "%s"`, item, name)
} else if address2 := net.ParseIP(matches[2]); address2 == nil || address2.To4() == nil {
return nil, fmt.Errorf(`invalid format "%v" for inet4pair option "%s"`, item, name)
} else {
copy(packet[offset+2+size:], address1.To4()[:4])
copy(packet[offset+2+size+4:], address2.To4()[:4])
size += 8
}
}
} else {
return nil, fmt.Errorf(`invalid format "%v" for inet4pair option "%s"`, item, name)
}
case V4MODE_CIDR4:
if tvalue, ok := item.(string); ok {
if matcher := rcache.Get(`^((?:\d+\.){3}\d+)/(\d+)$`); matcher == nil || !matcher.MatchString(tvalue) {
return nil, fmt.Errorf(`invalid format "%v" for cidr4 option "%s"`, item, name)
} else {
matches := matcher.FindStringSubmatch(tvalue)
if address := net.ParseIP(matches[1]); address == nil || address.To4() == nil {
return nil, fmt.Errorf(`invalid format "%v" for cidr4 option "%s"`, item, name)
} else {
copy(packet[offset+2+size:], address.To4()[:4])
size += 4
ones, _ := strconv.Atoi(matches[2])
mask := net.CIDRMask(ones, 32)
copy(packet[offset+2+size:], mask[:4])
size += 4
}
}
} else {
return nil, fmt.Errorf(`invalid format "%v" for cidr4 option "%s"`, item, name)
}
case V4MODE_MSGTYPE:
if tvalue, ok := item.(string); ok && V4RMSGTYPES[tvalue] != 0 {
packet[offset+2+size] = V4RMSGTYPES[tvalue]
size++
} else {
return nil, fmt.Errorf(`invalid message type "%v"`, item)
}
case V4MODE_OPTION:
if tvalue, ok := item.(string); ok {
if option := V4OPTIONS[tvalue]; option != nil {
packet[offset+2+size] = byte(option.id)
size++
} else {
if id, _ := strconv.Atoi(tvalue); id > 0 && id < 255 {
packet[offset+2+size] = byte(id)
size++
} else {
return nil, fmt.Errorf(`invalid format "%v" for option "%s"`, item, name)
}
}
} else {
return nil, fmt.Errorf(`invalid format "%v" for option "%s"`, item, name)
}
default:
return nil, fmt.Errorf(`unknow type %d for option "%s"`, option.mode&V4MODE_MASK, name)
}
}
if (option.min != 0 && size < option.min) || (option.max != 0 && size > option.max) || size > 255 {
return nil, fmt.Errorf(`out-of-bounds size %d for option "%s"`, size, name)
}
packet[offset+1] = byte(size)
offset += 2 + size
}
packet[offset] = 0xff
offset++
if offset < 300 {
offset = 300
}
return packet[:offset], nil
}