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.")
45 overheads = flag.Bool("overheads", false, "Print packet overheads")
46 dump = flag.Bool("dump", false, "Write decrypted/parsed payload to stdout")
47 decompress = flag.Bool("decompress", false, "Try to zstd decompress dumped data")
48 cfgPath = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
49 version = flag.Bool("version", false, "Print version information")
50 warranty = flag.Bool("warranty", false, "Print warranty information")
52 log.SetFlags(log.Lshortfile)
56 fmt.Println(nncp.Warranty)
60 fmt.Println(nncp.VersionGet())
66 "Plain: %d\nEncrypted: %d\nSize: %d\n",
75 beginning := make([]byte, nncp.PktOverhead)
76 if _, err = io.ReadFull(os.Stdin, beginning); err != nil {
77 log.Fatalln("Not enough data to read")
80 _, err = xdr.Unmarshal(bytes.NewReader(beginning), &pkt)
81 if err == nil && pkt.Magic == nncp.MagicNNCPPv3 {
83 bufW := bufio.NewWriter(os.Stdout)
85 r = bufio.NewReader(os.Stdin)
87 decompressor, err := zstd.NewReader(r)
93 if _, err = io.Copy(bufW, r); err != nil {
96 if err = bufW.Flush(); err != nil {
101 payloadType := "unknown"
103 case nncp.PktTypeFile:
105 case nncp.PktTypeFreq:
106 payloadType = "file request"
107 case nncp.PktTypeExec:
109 case nncp.PktTypeExecFat:
110 payloadType = "exec uncompressed"
111 case nncp.PktTypeTrns:
112 payloadType = "transitional"
116 case nncp.PktTypeExec, nncp.PktTypeExecFat:
117 path = string(bytes.Replace(
118 pkt.Path[:pkt.PathLen],
123 case nncp.PktTypeTrns:
124 path = nncp.Base32Codec.EncodeToString(pkt.Path[:pkt.PathLen])
126 path = string(pkt.Path[:pkt.PathLen])
129 "Packet type: plain\nPayload type: %s\nNiceness: %s (%d)\nPath: %s\n",
130 payloadType, nncp.NicenessFmt(pkt.Nice), pkt.Nice, path,
134 var pktEnc nncp.PktEnc
135 _, err = xdr.Unmarshal(bytes.NewReader(beginning), &pktEnc)
136 if err == nil && pktEnc.Magic == nncp.MagicNNCPEv5 {
138 ctx, err := nncp.CtxFromCmdline(*cfgPath, "", "", false, false, false, false)
140 log.Fatalln("Error during initialization:", err)
143 log.Fatalln("Config lacks private keys")
145 bufW := bufio.NewWriter(os.Stdout)
146 if _, _, err = nncp.PktEncRead(
150 bytes.NewReader(beginning),
151 bufio.NewReader(os.Stdin),
157 if err = bufW.Flush(); err != nil {
163 "Packet type: encrypted\nNiceness: %s (%d)\nSender: %s\nRecipient: %s\n",
164 nncp.NicenessFmt(pktEnc.Nice), pktEnc.Nice, pktEnc.Sender, pktEnc.Recipient,
168 log.Fatalln("Unable to determine packet type")