2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
3 Copyright (C) 2016-2023 Sergey Matveev <stargrave@stargrave.org>
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, version 3 of the License.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 // Parse raw NNCP packet.
30 xdr "github.com/davecgh/go-xdr/xdr2"
31 "github.com/klauspost/compress/zstd"
32 "go.cypherpunks.ru/nncp/v8"
36 fmt.Fprint(os.Stderr, nncp.UsageHeader())
37 fmt.Fprint(os.Stderr, "nncp-pkt -- parse raw packet\n\n")
38 fmt.Fprintf(os.Stderr, "Usage: %s [options]\nOptions:\n", os.Args[0])
40 fmt.Fprintln(os.Stderr, "Packet is read from stdin.")
43 func doPlain(ctx *nncp.Ctx, pkt nncp.Pkt, dump, decompress bool) {
45 bufW := bufio.NewWriter(os.Stdout)
47 r = bufio.NewReader(os.Stdin)
49 decompressor, err := zstd.NewReader(r)
55 if _, err := io.Copy(bufW, r); err != nil {
58 if err := bufW.Flush(); err != nil {
63 payloadType := "unknown"
65 case nncp.PktTypeFile:
67 case nncp.PktTypeFreq:
68 payloadType = "file request"
69 case nncp.PktTypeExec:
70 payloadType = "exec compressed"
71 case nncp.PktTypeTrns:
72 payloadType = "transitional"
73 case nncp.PktTypeExecFat:
74 payloadType = "exec uncompressed"
75 case nncp.PktTypeArea:
78 payloadType = "acknowledgement"
82 case nncp.PktTypeExec, nncp.PktTypeExecFat:
83 path = string(bytes.Replace(
84 pkt.Path[:pkt.PathLen], []byte{0}, []byte(" "), -1,
86 case nncp.PktTypeTrns:
87 path = nncp.Base32Codec.EncodeToString(pkt.Path[:pkt.PathLen])
88 node, err := ctx.FindNode(path)
90 path = fmt.Sprintf("%s (%s)", path, node.Name)
92 case nncp.PktTypeArea:
93 path = nncp.Base32Codec.EncodeToString(pkt.Path[:pkt.PathLen])
94 if areaId, err := nncp.AreaIdFromString(path); err == nil {
95 path = fmt.Sprintf("%s (%s)", path, ctx.AreaName(areaId))
98 path = nncp.Base32Codec.EncodeToString(pkt.Path[:pkt.PathLen])
100 path = string(pkt.Path[:pkt.PathLen])
103 "Packet type: plain\nPayload type: %s\nNiceness: %s (%d)\nPath: %s\n",
104 payloadType, nncp.NicenessFmt(pkt.Nice), pkt.Nice, path,
114 senderName := "unknown"
115 senderNode := ctx.Neigh[*pktEnc.Sender]
116 if senderNode != nil {
117 senderName = senderNode.Name
120 recipientName := "unknown"
122 recipientNode := ctx.Neigh[*pktEnc.Recipient]
123 if recipientNode == nil {
124 area = ctx.AreaId2Area[nncp.AreaId(*pktEnc.Recipient)]
126 recipientName = "area " + area.Name
129 recipientName = recipientNode.Name
133 fmt.Printf(`Packet type: encrypted
138 nncp.NicenessFmt(pktEnc.Nice), pktEnc.Nice,
139 pktEnc.Sender, senderName,
140 pktEnc.Recipient, recipientName,
145 log.Fatalln("Config lacks private keys")
147 bufW := bufio.NewWriter(os.Stdout)
150 _, _, _, err = nncp.PktEncRead(
152 io.MultiReader(bytes.NewReader(beginning), bufio.NewReader(os.Stdin)),
153 bufW, senderNode != nil, nil,
156 areaNode := nncp.NodeOur{Id: new(nncp.NodeId), ExchPrv: new([32]byte)}
157 copy(areaNode.Id[:], area.Id[:])
158 copy(areaNode.ExchPrv[:], area.Prv[:])
159 _, _, _, err = nncp.PktEncRead(
160 &areaNode, ctx.Neigh,
161 io.MultiReader(bytes.NewReader(beginning), bufio.NewReader(os.Stdin)),
162 bufW, senderNode != nil, nil,
168 if err = bufW.Flush(); err != nil {
175 overheads = flag.Bool("overheads", false, "Print packet overheads")
176 dump = flag.Bool("dump", false, "Write decrypted/parsed payload to stdout")
177 decompress = flag.Bool("decompress", false, "Try to zstd decompress dumped data")
178 cfgPath = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
179 version = flag.Bool("version", false, "Print version information")
180 warranty = flag.Bool("warranty", false, "Print warranty information")
182 log.SetFlags(log.Lshortfile)
186 fmt.Println(nncp.Warranty)
190 fmt.Println(nncp.VersionGet())
194 ctx, err := nncp.CtxFromCmdline(*cfgPath, "", "", false, false, false, false)
196 log.Fatalln("Error during initialization:", err)
201 "Plain: %d\nEncrypted: %d\nSize: %d\n",
204 nncp.PktSizeOverhead,
209 beginning := make([]byte, nncp.PktOverhead)
210 if _, err := io.ReadFull(os.Stdin, beginning[:nncp.PktEncOverhead]); err != nil {
211 log.Fatalln("Not enough data to read")
213 var pktEnc nncp.PktEnc
214 if _, err := xdr.Unmarshal(bytes.NewReader(beginning), &pktEnc); err == nil {
215 switch pktEnc.Magic {
216 case nncp.MagicNNCPEv1.B:
217 log.Fatalln(nncp.MagicNNCPEv1.TooOld())
218 case nncp.MagicNNCPEv2.B:
219 log.Fatalln(nncp.MagicNNCPEv2.TooOld())
220 case nncp.MagicNNCPEv3.B:
221 log.Fatalln(nncp.MagicNNCPEv3.TooOld())
222 case nncp.MagicNNCPEv4.B:
223 log.Fatalln(nncp.MagicNNCPEv4.TooOld())
224 case nncp.MagicNNCPEv5.B:
225 log.Fatalln(nncp.MagicNNCPEv5.TooOld())
226 case nncp.MagicNNCPEv6.B:
227 doEncrypted(ctx, pktEnc, *dump, beginning[:nncp.PktEncOverhead])
232 if _, err := io.ReadFull(os.Stdin, beginning[nncp.PktEncOverhead:]); err != nil {
233 log.Fatalln("Not enough data to read")
236 if _, err := xdr.Unmarshal(bytes.NewReader(beginning), &pkt); err == nil {
238 case nncp.MagicNNCPPv1.B:
239 log.Fatalln(nncp.MagicNNCPPv1.TooOld())
240 case nncp.MagicNNCPPv2.B:
241 log.Fatalln(nncp.MagicNNCPPv2.TooOld())
242 case nncp.MagicNNCPPv3.B:
243 doPlain(ctx, pkt, *dump, *decompress)
247 log.Fatalln("Unable to determine packet type")