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[nncp.git] / src / cmd / nncp-daemon / main.go
1 /*
2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
3 Copyright (C) 2016-2019 Sergey Matveev <stargrave@stargrave.org>
4
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.
8
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.
13
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/>.
16 */
17
18 // NNCP TCP daemon.
19 package main
20
21 import (
22         "flag"
23         "fmt"
24         "log"
25         "net"
26         "os"
27         "strconv"
28         "time"
29
30         "go.cypherpunks.ru/nncp/v5"
31         "golang.org/x/net/netutil"
32 )
33
34 func usage() {
35         fmt.Fprintf(os.Stderr, nncp.UsageHeader())
36         fmt.Fprintf(os.Stderr, "nncp-daemon -- TCP daemon\n\n")
37         fmt.Fprintf(os.Stderr, "Usage: %s [options]\nOptions:\n", os.Args[0])
38         flag.PrintDefaults()
39 }
40
41 type InetdConn struct {
42         r *os.File
43         w *os.File
44 }
45
46 func (c InetdConn) Read(p []byte) (n int, err error) {
47         return c.r.Read(p)
48 }
49
50 func (c InetdConn) Write(p []byte) (n int, err error) {
51         return c.w.Write(p)
52 }
53
54 func (c InetdConn) SetReadDeadline(t time.Time) error {
55         return c.r.SetReadDeadline(t)
56 }
57
58 func (c InetdConn) SetWriteDeadline(t time.Time) error {
59         return c.w.SetWriteDeadline(t)
60 }
61
62 func (c InetdConn) Close() error {
63         return c.w.Close()
64 }
65
66 func performSP(ctx *nncp.Ctx, conn nncp.ConnDeadlined, nice uint8) {
67         state := nncp.SPState{
68                 Ctx:  ctx,
69                 Nice: nice,
70         }
71         if err := state.StartR(conn); err == nil {
72                 ctx.LogI("call-start", nncp.SDS{"node": state.Node.Id}, "connected")
73                 state.Wait()
74                 ctx.LogI("call-finish", nncp.SDS{
75                         "node":     state.Node.Id,
76                         "duration": strconv.FormatInt(int64(state.Duration.Seconds()), 10),
77                         "rxbytes":  strconv.FormatInt(state.RxBytes, 10),
78                         "txbytes":  strconv.FormatInt(state.TxBytes, 10),
79                         "rxspeed":  strconv.FormatInt(state.RxSpeed, 10),
80                         "txspeed":  strconv.FormatInt(state.TxSpeed, 10),
81                 }, "")
82         } else {
83                 nodeId := "unknown"
84                 if state.Node != nil {
85                         nodeId = state.Node.Id.String()
86                 }
87                 ctx.LogE("call-start", nncp.SDS{"node": nodeId, "err": err}, "")
88         }
89 }
90
91 func main() {
92         var (
93                 cfgPath   = flag.String("cfg", nncp.DefaultCfgPath, "Path to configuration file")
94                 niceRaw   = flag.String("nice", nncp.NicenessFmt(255), "Minimal required niceness")
95                 bind      = flag.String("bind", "[::]:5400", "Address to bind to")
96                 inetd     = flag.Bool("inetd", false, "Is it started as inetd service")
97                 maxConn   = flag.Int("maxconn", 128, "Maximal number of simultaneous connections")
98                 spoolPath = flag.String("spool", "", "Override path to spool")
99                 logPath   = flag.String("log", "", "Override path to logfile")
100                 quiet     = flag.Bool("quiet", false, "Print only errors")
101                 debug     = flag.Bool("debug", false, "Print debug messages")
102                 version   = flag.Bool("version", false, "Print version information")
103                 warranty  = flag.Bool("warranty", false, "Print warranty information")
104         )
105         flag.Usage = usage
106         flag.Parse()
107         if *warranty {
108                 fmt.Println(nncp.Warranty)
109                 return
110         }
111         if *version {
112                 fmt.Println(nncp.VersionGet())
113                 return
114         }
115         nice, err := nncp.NicenessParse(*niceRaw)
116         if err != nil {
117                 log.Fatalln(err)
118         }
119
120         ctx, err := nncp.CtxFromCmdline(*cfgPath, *spoolPath, *logPath, *quiet, *debug)
121         if err != nil {
122                 log.Fatalln("Error during initialization:", err)
123         }
124         if ctx.Self == nil {
125                 log.Fatalln("Config lacks private keys")
126         }
127         ctx.Umask()
128
129         if *inetd {
130                 os.Stderr.Close()
131                 conn := &InetdConn{os.Stdin, os.Stdout}
132                 performSP(ctx, conn, nice)
133                 return
134         }
135
136         ln, err := net.Listen("tcp", *bind)
137         if err != nil {
138                 log.Fatalln("Can not listen:", err)
139         }
140         ln = netutil.LimitListener(ln, *maxConn)
141         for {
142                 conn, err := ln.Accept()
143                 if err != nil {
144                         log.Fatalln("Can not accept connection:", err)
145                 }
146                 ctx.LogD("daemon", nncp.SDS{"addr": conn.RemoteAddr()}, "accepted")
147                 go func(conn net.Conn) {
148                         performSP(ctx, conn, nice)
149                         conn.Close()
150                 }(conn)
151         }
152 }