2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
3 Copyright (C) 2016-2022 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.Fprintf(os.Stderr, nncp.UsageHeader())
37 fmt.Fprintf(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:
80 case nncp.PktTypeExec, nncp.PktTypeExecFat:
81 path = string(bytes.Replace(
82 pkt.Path[:pkt.PathLen], []byte{0}, []byte(" "), -1,
84 case nncp.PktTypeTrns:
85 path = nncp.Base32Codec.EncodeToString(pkt.Path[:pkt.PathLen])
86 node, err := ctx.FindNode(path)
88 path = fmt.Sprintf("%s (%s)", path, node.Name)
90 case nncp.PktTypeArea:
91 path = nncp.Base32Codec.EncodeToString(pkt.Path[:pkt.PathLen])
92 if areaId, err := nncp.AreaIdFromString(path); err == nil {
93 path = fmt.Sprintf("%s (%s)", path, ctx.AreaName(areaId))
96 path = string(pkt.Path[:pkt.PathLen])
99 "Packet type: plain\nPayload type: %s\nNiceness: %s (%d)\nPath: %s\n",
100 payloadType, nncp.NicenessFmt(pkt.Nice), pkt.Nice, path,
111 senderName := "unknown"
112 senderNode := ctx.Neigh[*pktEnc.Sender]
113 if senderNode != nil {
114 senderName = senderNode.Name
117 recipientName := "unknown"
119 recipientNode := ctx.Neigh[*pktEnc.Recipient]
120 if recipientNode == nil {
121 area = ctx.AreaId2Area[nncp.AreaId(*pktEnc.Recipient)]
123 recipientName = "area " + area.Name
126 recipientName = recipientNode.Name
130 fmt.Printf(`Packet type: encrypted
135 nncp.NicenessFmt(pktEnc.Nice), pktEnc.Nice,
136 pktEnc.Sender, senderName,
137 pktEnc.Recipient, recipientName,
142 log.Fatalln("Config lacks private keys")
144 bufW := bufio.NewWriter(os.Stdout)
147 _, _, _, err = nncp.PktEncRead(
149 io.MultiReader(bytes.NewReader(beginning), bufio.NewReader(os.Stdin)),
150 bufW, senderNode != nil, nil,
153 areaNode := nncp.NodeOur{Id: new(nncp.NodeId), ExchPrv: new([32]byte)}
154 copy(areaNode.Id[:], area.Id[:])
155 copy(areaNode.ExchPrv[:], area.Prv[:])
156 _, _, _, err = nncp.PktEncRead(
157 &areaNode, ctx.Neigh,
158 io.MultiReader(bytes.NewReader(beginning), bufio.NewReader(os.Stdin)),
159 bufW, senderNode != nil, nil,
165 if err = bufW.Flush(); err != nil {
172 overheads = flag.Bool("overheads", false, "Print packet overheads")
173 dump = flag.Bool("dump", false, "Write decrypted/parsed payload to stdout")
174 decompress = flag.Bool("decompress", false, "Try to zstd decompress dumped data")
175 cfgPath = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
176 version = flag.Bool("version", false, "Print version information")
177 warranty = flag.Bool("warranty", false, "Print warranty information")
179 log.SetFlags(log.Lshortfile)
183 fmt.Println(nncp.Warranty)
187 fmt.Println(nncp.VersionGet())
191 ctx, err := nncp.CtxFromCmdline(*cfgPath, "", "", false, false, false, false)
193 log.Fatalln("Error during initialization:", err)
198 "Plain: %d\nEncrypted: %d\nSize: %d\n",
201 nncp.PktSizeOverhead,
206 beginning := make([]byte, nncp.PktOverhead)
207 if _, err := io.ReadFull(os.Stdin, beginning[:nncp.PktEncOverhead]); err != nil {
208 log.Fatalln("Not enough data to read")
210 var pktEnc nncp.PktEnc
211 if _, err := xdr.Unmarshal(bytes.NewReader(beginning), &pktEnc); err == nil {
212 switch pktEnc.Magic {
213 case nncp.MagicNNCPEv1.B:
214 log.Fatalln(nncp.MagicNNCPEv1.TooOld())
215 case nncp.MagicNNCPEv2.B:
216 log.Fatalln(nncp.MagicNNCPEv2.TooOld())
217 case nncp.MagicNNCPEv3.B:
218 log.Fatalln(nncp.MagicNNCPEv3.TooOld())
219 case nncp.MagicNNCPEv4.B:
220 log.Fatalln(nncp.MagicNNCPEv4.TooOld())
221 case nncp.MagicNNCPEv5.B:
222 log.Fatalln(nncp.MagicNNCPEv5.TooOld())
223 case nncp.MagicNNCPEv6.B:
224 doEncrypted(ctx, pktEnc, *dump, beginning[:nncp.PktEncOverhead])
229 if _, err := io.ReadFull(os.Stdin, beginning[nncp.PktEncOverhead:]); err != nil {
230 log.Fatalln("Not enough data to read")
233 if _, err := xdr.Unmarshal(bytes.NewReader(beginning), &pkt); err == nil {
235 case nncp.MagicNNCPPv1.B:
236 log.Fatalln(nncp.MagicNNCPPv1.TooOld())
237 case nncp.MagicNNCPPv2.B:
238 log.Fatalln(nncp.MagicNNCPPv2.TooOld())
239 case nncp.MagicNNCPPv3.B:
240 doPlain(ctx, pkt, *dump, *decompress)
244 log.Fatalln("Unable to determine packet type")