2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
3 Copyright (C) 2016-2021 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/v7"
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(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.PktTypeExecFat:
72 payloadType = "exec uncompressed"
73 case nncp.PktTypeTrns:
74 payloadType = "transitional"
78 case nncp.PktTypeExec, nncp.PktTypeExecFat:
79 path = string(bytes.Replace(
80 pkt.Path[:pkt.PathLen],
85 case nncp.PktTypeTrns:
86 path = nncp.Base32Codec.EncodeToString(pkt.Path[:pkt.PathLen])
88 path = string(pkt.Path[:pkt.PathLen])
91 "Packet type: plain\nPayload type: %s\nNiceness: %s (%d)\nPath: %s\n",
92 payloadType, nncp.NicenessFmt(pkt.Nice), pkt.Nice, path,
97 func doEncrypted(pktEnc nncp.PktEnc, dump bool, cfgPath string, beginning []byte) {
98 ctx, err := nncp.CtxFromCmdline(cfgPath, "", "", false, false, false, false)
100 log.Fatalln("Error during initialization:", err)
104 recipientS := "unknown"
105 if n, ok := ctx.Neigh[*pktEnc.Sender]; ok {
108 if n, ok := ctx.Neigh[*pktEnc.Recipient]; ok {
112 "Packet type: encrypted\nNiceness: %s (%d)\nSender: %s (%s)\nRecipient: %s (%s)\n",
113 nncp.NicenessFmt(pktEnc.Nice), pktEnc.Nice,
114 pktEnc.Sender, senderS,
115 pktEnc.Recipient, recipientS,
120 log.Fatalln("Config lacks private keys")
122 bufW := bufio.NewWriter(os.Stdout)
123 if _, _, err = nncp.PktEncRead(
127 bytes.NewReader(beginning),
128 bufio.NewReader(os.Stdin),
134 if err = bufW.Flush(); err != nil {
141 overheads = flag.Bool("overheads", false, "Print packet overheads")
142 dump = flag.Bool("dump", false, "Write decrypted/parsed payload to stdout")
143 decompress = flag.Bool("decompress", false, "Try to zstd decompress dumped data")
144 cfgPath = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
145 version = flag.Bool("version", false, "Print version information")
146 warranty = flag.Bool("warranty", false, "Print warranty information")
148 log.SetFlags(log.Lshortfile)
152 fmt.Println(nncp.Warranty)
156 fmt.Println(nncp.VersionGet())
162 "Plain: %d\nEncrypted: %d\nSize: %d\n",
165 nncp.PktSizeOverhead,
170 beginning := make([]byte, nncp.PktOverhead)
171 if _, err := io.ReadFull(os.Stdin, beginning); err != nil {
172 log.Fatalln("Not enough data to read")
175 if _, err := xdr.Unmarshal(bytes.NewReader(beginning), &pkt); err == nil {
177 case nncp.MagicNNCPPv1.B:
178 log.Fatalln(nncp.MagicNNCPPv1.TooOld())
179 case nncp.MagicNNCPPv2.B:
180 log.Fatalln(nncp.MagicNNCPPv2.TooOld())
181 case nncp.MagicNNCPPv3.B:
182 doPlain(pkt, *dump, *decompress)
186 var pktEnc nncp.PktEnc
187 if _, err := xdr.Unmarshal(bytes.NewReader(beginning), &pktEnc); err == nil {
189 case nncp.MagicNNCPEv1.B:
190 log.Fatalln(nncp.MagicNNCPEv1.TooOld())
191 case nncp.MagicNNCPEv2.B:
192 log.Fatalln(nncp.MagicNNCPEv2.TooOld())
193 case nncp.MagicNNCPEv3.B:
194 log.Fatalln(nncp.MagicNNCPEv3.TooOld())
195 case nncp.MagicNNCPEv4.B:
196 log.Fatalln(nncp.MagicNNCPEv4.TooOld())
197 case nncp.MagicNNCPEv5.B:
198 doEncrypted(pktEnc, *dump, *cfgPath, beginning)
202 log.Fatalln("Unable to determine packet type")