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7
.gitignore vendored
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@ -4,9 +4,4 @@
/.env
/socks
/host.key
/custom
/dist
tools/
/CHANGELOG.md
/.chglog
/stats.json
/custom

95
.goreleaser.yaml
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@ -1,95 +0,0 @@
project_name: rebound
before:
hooks:
- go mod tidy
builds:
- id: rebound
env:
- CGO_ENABLED=0
ldflags:
- -s
- -w
- -X "main.Version={{ .Env.GORELEASER_CURRENT_TAG }}"
gcflags:
- -trimpath="${PWD}"
asmflags:
- -trimpath="${PWD}"
goos:
- linux
goarch:
- amd64
- "386"
main: ./cmd/server
archives:
- id: rebound
builds: ["rebound"]
name_template: '{{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}{{ with .Arm }}v{{ . }}{{ end }}{{ with .Mips }}_{{ . }}{{ end }}{{ if not (eq .Amd64 "v1") }}{{ .Amd64 }}{{ end }}'
files:
- README.md
checksum:
name_template: 'checksums.txt'
snapshot:
name_template: "{{ .Version }}"
changelog:
sort: asc
filters:
exclude:
- '^docs:'
- '^test:'
nfpms:
- id: rebound
builds:
- "rebound"
package_name: rebound
homepage: https://forge.cadoles.com/wpetit/rebound
maintainer: William Petit <wpetit@cadoles.com>
description: |-
SSH tunneling for machines behind NATs.
license: AGPL-3.0
formats:
- apk
- deb
- rpm
contents:
# Deb
- src: misc/packaging/systemd/rebound.systemd.service
dst: /usr/lib/systemd/system/rebound.service
packager: deb
- src: misc/packaging/systemd/rebound.env
dst: /etc/rebound/environ
type: config|noreplace
packager: deb
# RPM
- src: misc/packaging/systemd/rebound.systemd.service
dst: /usr/lib/systemd/system/rebound.service
packager: rpm
- src: misc/packaging/systemd/rebound.env
type: config|noreplace
dst: /etc/rebound/environ
packager: rpm
# APK
- src: misc/packaging/openrc/rebound.openrc.sh
dst: /etc/init.d/rebound
file_info:
mode: 0755
packager: apk
- src: misc/packaging/openrc/rebound.conf
type: config|noreplace
dst: /etc/conf.d/rebound
file_info:
mode: 0755
packager: apk
# All
- dst: /var/lib/rebound
type: dir
file_info:
mode: 0700
- dst: /var/log/rebound
type: dir
file_info:
mode: 0700
scripts:
postinstall: "misc/packaging/common/postinstall-rebound.sh"

661
LICENCE
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@ -1,661 +0,0 @@
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OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

28
Makefile
View File

@ -1,15 +1,6 @@
SHELL := /bin/bash
DOKKU_URL := dokku@dev.lookingfora.name:rebound
GORELEASER_VERSION ?= v1.13.1
GORELEASER_ARGS ?= release --snapshot --clean
MKT_GITEA_RELEASE_ORG ?= wpetit
MKT_GITEA_RELEASE_PROJECT ?= rebound
MKT_GITEA_RELEASE_VERSION ?= $(MKT_PROJECT_VERSION)
DEPLOY_TARGET ?= root@cadoles-rebound
all: build
watch: tools/modd/bin/modd
@ -43,25 +34,6 @@ dokku-deploy:
$(if $(shell git config remote.dokku.url),, git remote add dokku $(DOKKU_URL))
git push -f dokku $(shell git rev-parse HEAD):refs/heads/master
.PHONY: dist
dist: .mktools
( set -o allexport && source .env && set +o allexport && VERSION=$(GORELEASER_VERSION) curl -sfL https://goreleaser.com/static/run | GORELEASER_CURRENT_TAG="$(MKT_PROJECT_VERSION)" bash /dev/stdin $(GORELEASER_ARGS) )
.PHONY: release
release: changelog
$(MAKE) MKT_GITEA_RELEASE_ATTACHMENTS="$$(find dist/* -type f -name '*.apk' -or -name '*.deb' -or -name '*.rpm' -or -name 'checksums.txt' -or -name 'CHANGELOG.md' | tr '\n' ' ')" mkt-gitea-release
.PHONY: changelog
changelog: .mktools
$(MAKE) MKT_GIT_CHGLOG_ARGS='--next-tag $(MKT_PROJECT_VERSION) --tag-filter-pattern $(MKT_PROJECT_VERSION_CHANNEL) --output CHANGELOG.md' mkt-changelog
.PHONY: deploy
deploy: dist
FILE=$$(find ./dist -name '*amd64.deb') \
&& ssh $(DEPLOY_TARGET) rm -f ~/rebound_*amd64.deb \
&& scp $${FILE} $(DEPLOY_TARGET):~/ \
&& ssh $(DEPLOY_TARGET) dpkg -i $$(basename $${FILE})
.PHONY: mktools
mktools:
rm -rf .mktools

18
README.md
View File

@ -1,23 +1,19 @@
# Rebound
An TCP tunneling server requiring only a SSH client.
Serveur utilisant le protocole SSH pour créer des tunnels TCP/IP.
## Usage
We want to access `<local_address>:<local_port>` from machine A's network as `<target_port>` on machine B.
### Opening the tunnel on machine A
### Ouvrir un tunnel sur un port local
```shell
ssh -R 0:<local_address>:<local_port> root@rebound-server -p 80
ssh -R 0:<target_address>:<target_port> root@rebound.lookingfora.name -p 2222
```
### Connecting to the tunnel on machine B
### Se connecter à un tunnel ouvert
```shell
ssh -L <target_port>:0.0.0.0:1 <secret>@rebound-server -p 80
```
ssh -L <local_port>:0.0.0.0:1 <secret>@rebound.lookingfora.name -p 2222
```
## Licence
[AGPL-3.0](./LICENCE)
Vous pourrez ensuite accéder au service sur `127.0.0.1:<local_port>` comme si c'était `<target_address>:<target_port>`.

32
cmd/server/main.go
View File

@ -1,6 +1,7 @@
package main
import (
"flag"
"log"
"os"
"os/signal"
@ -11,8 +12,6 @@ import (
"github.com/pkg/errors"
)
var Version string = "unknown"
func main() {
opts := rebound.DefaultOptions()
@ -20,21 +19,30 @@ func main() {
log.Fatalf("[ERROR] %+v", errors.WithStack(err))
}
opts.HTTP.TemplateData.Version = Version
// Global Options
address := flag.String("address", opts.Address, "server listening address")
// SSH Options
sockDir := flag.String("ssh-sock-dir", opts.SSH.SockDir, "ssh sock directory")
publicPort := flag.Uint("ssh-public-port", opts.SSH.PublicPort, "ssh public port")
publicHost := flag.String("ssh-public-host", opts.SSH.PublicHost, "ssh public host")
hostKey := flag.String("ssh-host-key", opts.SSH.HostKey, "ssh host key")
// HTTP Options
customDir := flag.String("http-custom-dir", opts.HTTP.CustomDir, "http custom templates/assets directory")
flag.Parse()
server := rebound.NewServer(
rebound.WithAddress(opts.Address),
rebound.WithStatsFile(opts.StatsFile),
rebound.WithStatsFileSaveInterval(opts.StatsFileSaveInterval),
rebound.WithAddress(*address),
rebound.WithSSHOption(
ssh.WithSockDir(opts.SSH.SockDir),
ssh.WithPublicHost(opts.SSH.PublicHost),
ssh.WithPublicPort(opts.SSH.PublicPort),
ssh.WithHostKey(opts.SSH.HostKey),
ssh.WithSockDir(*sockDir),
ssh.WithPublicHost(*publicHost),
ssh.WithPublicPort(*publicPort),
ssh.WithHostKey(*hostKey),
),
rebound.WitHTTPOption(
http.WithCustomDir(opts.HTTP.CustomDir),
http.WithTemplateData(opts.HTTP.TemplateData),
http.WithCustomDir(*customDir),
),
)

37
http/options.go
View File

@ -1,23 +1,10 @@
package http
import (
"log"
"forge.cadoles.com/wpetit/rebound/stat"
)
import "log"
type Options struct {
Logger func(message string, args ...any)
CustomDir string `env:"CUSTOM_DIR"`
TemplateData *TemplateData `envPrefix:"TEMPLATE_DATA_"`
Stats *stat.Store
}
type TemplateData struct {
Title string `env:"TITLE"`
Version string
SSHPublicHost string `env:"SSH_PUBLIC_HOST"`
SSHPublicPort int `env:"SSH_PUBLIC_PORT"`
Logger func(message string, args ...any)
CustomDir string `env:"CUSTOM_DIR"`
}
type OptionFunc func(*Options)
@ -26,12 +13,6 @@ func DefaultOptions() *Options {
return &Options{
Logger: log.Printf,
CustomDir: "",
TemplateData: &TemplateData{
Title: "Rebound",
SSHPublicHost: "127.0.0.1",
SSHPublicPort: 2222,
},
Stats: stat.NewStore(),
}
}
@ -46,15 +27,3 @@ func WithCustomDir(customDir string) func(*Options) {
opts.CustomDir = customDir
}
}
func WithTemplateData(templateData *TemplateData) func(*Options) {
return func(opts *Options) {
opts.TemplateData = templateData
}
}
func WithStats(stats *stat.Store) func(*Options) {
return func(opts *Options) {
opts.Stats = stats
}
}

39
http/server.go
View File

@ -3,11 +3,9 @@ package http
import (
"bytes"
"embed"
"fmt"
"html/template"
"io"
"io/fs"
"log/slog"
"net"
"net/http"
"os"
@ -31,44 +29,13 @@ type Server struct {
templates template.Template
}
var templateFuncs = template.FuncMap{
"humanSize": func(b float64) string {
const unit = 1000
if b < unit {
return fmt.Sprintf("%d B", int64(b))
}
div, exp := int64(unit), 0
for n := b / unit; n >= unit; n /= unit {
div *= unit
exp++
}
return fmt.Sprintf("%.1f %cB",
float64(b)/float64(div), "kMGTPE"[exp])
},
}
func (s *Server) serveHomepage(w http.ResponseWriter, r *http.Request) {
stats, err := s.opts.Stats.Snapshot()
if err != nil {
slog.Error("could not make stats snapshot", slog.Any("error", errors.WithStack(err)))
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
return
}
data := struct {
TemplateData
Stats map[string]float64
Title string
}{
TemplateData: *s.opts.TemplateData,
Stats: stats,
Title: "Rebound",
}
s.opts.Stats.Add(StatTotalPageView, 1, 0)
s.renderTemplate(w, "index", data)
}
@ -106,7 +73,7 @@ func (s *Server) Serve(l net.Listener) error {
}
func (s *Server) parseTemplates(fs fs.FS) error {
templates, err := template.New("").Funcs(templateFuncs).ParseFS(fs, "templates/*.html")
templates, err := template.ParseFS(fs, "templates/*.html")
if err != nil {
return errors.WithStack(err)
}

5
http/stats.go
View File

@ -1,5 +0,0 @@
package http
const (
StatTotalPageView = "total_page_view"
)

2
http/templates/footer.html
View File

@ -2,7 +2,7 @@
<footer class="footer">
<div class="container">
<div class="content has-text-centered">
Ce service est propulsé par <a href="https://forge.cadoles.com/wpetit/rebound" title="Rebound repository">rebound@{{ .Version }}</a>, un logiciel libre diffusé sous licence <a href="https://www.gnu.org/licenses/agpl-3.0.en.html#license-text">AGPL-3.0</a>.
Ce service est propulsé par Rebound, un logiciel libre diffusé sous licence <a href="#">AGPL-3.0</a>.
</div>
</div>
</footer>

48
http/templates/index.html
View File

@ -13,46 +13,14 @@
<p class="subtitle is-size-3">
Bienvenue sur <strong>Rebound</strong>!
</p>
<div class="block">
<div class="content">
<p>Rebound est un serveur SSH permettant de créer des tunnels TCP/IP éphémères et privés entre 2 machines positionnées
derrière un <abbr title="Network Address Traversal">NAT</abbr>.</p>
<p>Pour l'utiliser <strong>un simple client SSH suffit !</strong></p>
<pre class="has-background-dark has-text-white-ter is-family-monospace">ssh -R 0:127.0.0.1:<span class="has-text-info">&lt;port&gt;</span> rebound@{{ .SSHPublicHost }} -p {{ .SSHPublicPort }}</pre>
<p class="is-italic">Où <span class="has-text-info">&lt;port&gt;</span> est à remplacer par le port du service
s'exécutant sur votre machine en local.</span>
<p>Une fois connecté, suivez les instructions. 😉</p>
</div>
</div>
<hr />
<div class="block">
<div class="columns">
<div class="column is-4">
<h3 class="title is-size-4">En savoir plus</h3>
<div class="content">
À venir...
</div>
</div>
<div class="column is-4">
<h3 class="title is-size-4">Statistiques</h3>
<table class="table is-bordered is-striped is-fullwidth">
<tbody>
<tr>
<td><strong>Total tunnels ouverts</strong></td>
<td>{{ index .Stats "total_opened_tunnels" }}</td>
</tr>
<tr>
<td><strong>Total données entrantes</strong></td>
<td>{{ humanSize ( index .Stats "total_rx_bytes" ) }}</td>
</tr>
<tr>
<td><strong>Total données sortantes</strong></td>
<td>{{ humanSize ( index .Stats "total_tx_bytes" ) }}</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="content">
<p>Rebound est un serveur SSH permettant de créer des tunnels TCP/IP éphémères et privés entre 2 machines positionnées
derrière un <abbr title="Network Address Traversal">NAT</abbr>.</p>
<p>Pour l'utiliser <strong>un simple client SSH suffit !</strong></p>
<pre class="has-background-dark has-text-white-ter is-family-monospace">ssh -R 0:127.0.0.1:<span class="has-text-info">&lt;port&gt;</span> rebound@rebound.cadol.es</pre>
<p class="is-italic">Où <span class="has-text-info">&lt;port&gt;</span> est à remplacer par le port du service
s'exécutant sur votre machine en local.</span>
<p>Une fois connecté, suivez les instructions. 😉</p>
</div>
</div>
</section>

75
misc/packaging/common/postinstall-rebound.sh
View File

@ -1,75 +0,0 @@
#!/bin/sh
use_systemctl="True"
systemd_version=0
if ! command -V systemctl >/dev/null 2>&1; then
use_systemctl="False"
else
systemd_version=$(systemctl --version | head -1 | cut -d ' ' -f 2)
fi
service_name=rebound
cleanup() {
if [ "${use_systemctl}" = "False" ]; then
rm -f /usr/lib/systemd/system/${service_name}.service
else
rm -f /etc/chkconfig/${service_name}
rm -f /etc/init.d/${service_name}
fi
}
cleanInstall() {
printf "\033[32m Post Install of an clean install\033[0m\n"
if [ "${use_systemctl}" = "False" ]; then
if command -V chkconfig >/dev/null 2>&1; then
chkconfig --add ${service_name}
fi
service ${service_name} restart || :
else
if [[ "${systemd_version}" -lt 231 ]]; then
printf "\033[31m systemd version %s is less then 231, fixing the service file \033[0m\n" "${systemd_version}"
sed -i "s/=+/=/g" /usr/lib/systemd/system/${service_name}.service
fi
printf "\033[32m Reload the service unit from disk\033[0m\n"
systemctl daemon-reload || :
printf "\033[32m Unmask the service\033[0m\n"
systemctl unmask ${service_name} || :
printf "\033[32m Set the preset flag for the service unit\033[0m\n"
systemctl preset ${service_name} || :
printf "\033[32m Set the enabled flag for the service unit\033[0m\n"
systemctl enable ${service_name} || :
systemctl restart ${service_name} || :
fi
}
upgrade() {
printf "\033[32m Post Install of an upgrade\033[0m\n"
systemctl daemon-reload || :
systemctl restart ${service_name} || :
}
# Step 2, check if this is a clean install or an upgrade
action="$1"
if [ "$1" = "configure" ] && [ -z "$2" ]; then
action="install"
elif [ "$1" = "configure" ] && [ -n "$2" ]; then
action="upgrade"
fi
case "$action" in
"1" | "install")
cleanInstall
;;
"2" | "upgrade")
printf "\033[32m Post Install of an upgrade\033[0m\n"
upgrade
;;
*)
printf "\033[32m Alpine\033[0m"
cleanInstall
;;
esac
cleanup

10
misc/packaging/openrc/rebound.conf
View File

@ -1,10 +0,0 @@
export REBOUND_ADDRESS=:2222
export REBOUND_HTTP_CUSTOM_DIR=/etc/rebound/custom
export REBOUND_SSH_PUBLIC_HOST=rebound
export REBOUND_SSH_PUBLIC_PORT=2222
export REBOUND_SSH_SOCK_DIR=/var/lib/rebound/socks
export REBOUND_SSH_HOST_KEY=/etc/rebound/host.key
export REBOUND_STATS_FILE=/var/lib/rebound/stats.json
export REBOUND_HTTP_TEMPLATE_DATA_TITLE=Rebound
export REBOUND_HTTP_TEMPLATE_DATA_SSH_PUBLIC_HOST=127.0.0.1
export REBOUND_HTTP_TEMPLATE_DATA_SSH_PUBLIC_PORT=8080

11
misc/packaging/openrc/rebound.openrc.sh
View File

@ -1,11 +0,0 @@
#!/sbin/openrc-run
command="/usr/bin/rebound"
command_args=""
supervisor=supervise-daemon
output_log="/var/log/rebound.log"
error_log="$output_log"
depend() {
need net
}

10
misc/packaging/systemd/rebound.env
View File

@ -1,10 +0,0 @@
REBOUND_ADDRESS=:8080
REBOUND_HTTP_CUSTOM_DIR=/var/lib/rebound/custom
REBOUND_SSH_PUBLIC_HOST=rebound
REBOUND_SSH_PUBLIC_PORT=8080
REBOUND_SSH_SOCK_DIR=/var/lib/rebound/socks
REBOUND_SSH_HOST_KEY=/var/lib/rebound/host.key
REBOUND_STATS_FILE=/var/lib/rebound/stats.json
REBOUND_HTTP_TEMPLATE_DATA_TITLE=Rebound
REBOUND_HTTP_TEMPLATE_DATA_SSH_PUBLIC_HOST=127.0.0.1
REBOUND_HTTP_TEMPLATE_DATA_SSH_PUBLIC_PORT=8080

35
misc/packaging/systemd/rebound.systemd.service
View File

@ -1,35 +0,0 @@
[Unit]
Description=rebound service
After=network.target
[Service]
Type=simple
Restart=on-failure
EnvironmentFile=/etc/rebound/environ
ExecStart=/usr/bin/rebound
EnvironmentFile=/etc/rebound/environ
NoNewPrivileges=yes
PrivateTmp=yes
PrivateDevices=yes
PrivateUsers=yes
DynamicUser=yes
StateDirectory=rebound
DevicePolicy=closed
ProtectSystem=true
ProtectHome=read-only
ProtectKernelLogs=yes
ProtectProc=invisible
ProtectClock=yes
ProtectControlGroups=yes
ProtectKernelModules=yes
ProtectKernelTunables=yes
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6 AF_NETLINK
RestrictNamespaces=yes
RestrictRealtime=yes
RestrictSUIDSGID=yes
MemoryDenyWriteExecute=yes
LockPersonality=yes
CapabilityBoundingSet=~CAP_SETUID CAP_SETGID CAP_SETPCAP CAP_SYS_ADMIN CAP_SYS_PTRACE CAP_CHOWN CAP_FSETID CAP_SETFCAP CAP_DAC_OVERRIDE CAP_DAC_READ_SEARCH CAP_FOWNER CAP_IPC_OWNER CAP_NET_ADMIN CAP_WAKE_ALARM CAP_SYS_TTY_CONFIG
[Install]
WantedBy=multi-user.target

33
options.go
View File

@ -2,7 +2,6 @@ package rebound
import (
"log"
"time"
"forge.cadoles.com/wpetit/rebound/http"
"forge.cadoles.com/wpetit/rebound/ssh"
@ -11,12 +10,10 @@ import (
)
type Options struct {
Address string `env:"REBOUND_ADDRESS"`
StatsFile string `env:"REBOUND_STATS_FILE"`
StatsFileSaveInterval time.Duration `env:"REBOUND_STATS_FILE_SAVE_INTERVAL"`
Logger func(message string, args ...any)
SSH *ssh.Options `envPrefix:"REBOUND_SSH_"`
HTTP *http.Options `envPrefix:"REBOUND_HTTP_"`
Address string `env:"REBOUND_ADDRESS"`
Logger func(message string, args ...any)
SSH *ssh.Options `envPrefix:"REBOUND_SSH_"`
HTTP *http.Options `envPrefix:"REBOUND_HTTP_"`
}
func (o *Options) ParseEnv() error {
@ -31,12 +28,10 @@ type OptionFunc func(*Options)
func DefaultOptions() *Options {
return &Options{
Address: "127.0.0.1:2222",
StatsFile: "stats.json",
StatsFileSaveInterval: 30 * time.Second,
Logger: log.Printf,
SSH: ssh.DefaultOptions(),
HTTP: http.DefaultOptions(),
Address: "127.0.0.1:2222",
Logger: log.Printf,
SSH: ssh.DefaultOptions(),
HTTP: http.DefaultOptions(),
}
}
@ -54,18 +49,6 @@ func WithLogger(logger func(message string, args ...any)) func(*Options) {
}
}
func WithStatsFile(path string) func(*Options) {
return func(o *Options) {
o.StatsFile = path
}
}
func WithStatsFileSaveInterval(interval time.Duration) func(*Options) {
return func(o *Options) {
o.StatsFileSaveInterval = interval
}
}
func WithSSHOption(funcs ...ssh.OptionFunc) func(*Options) {
return func(o *Options) {
for _, fn := range funcs {

36
server.go
View File

@ -1,34 +1,21 @@
package rebound
import (
"log/slog"
"net"
"os"
"time"
"forge.cadoles.com/wpetit/rebound/http"
"forge.cadoles.com/wpetit/rebound/ssh"
"forge.cadoles.com/wpetit/rebound/stat"
"github.com/pkg/errors"
)
type Server struct {
listener net.Listener
opts *Options
stats *stat.Store
}
func (s *Server) Start() error {
s.log("[INFO] listening on %s", s.opts.Address)
if err := s.stats.Load(s.opts.StatsFile); err != nil {
if errors.Is(err, os.ErrNotExist) {
s.log("[INFO] stats file does not exist. ignoring.")
} else {
return errors.WithStack(err)
}
}
listener, err := net.Listen("tcp", s.opts.Address)
if err != nil {
return errors.WithStack(err)
@ -47,7 +34,6 @@ func (s *Server) Start() error {
ssh.WithPublicPort(s.opts.SSH.PublicPort),
ssh.WithSockDir(s.opts.SSH.SockDir),
ssh.WithLogger(s.opts.SSH.Logger),
ssh.WithStats(s.stats),
)
if err := server.Serve(sshListener); err != nil {
@ -61,9 +47,7 @@ func (s *Server) Start() error {
server := http.NewServer(
http.WithCustomDir(s.opts.HTTP.CustomDir),
http.WithTemplateData(s.opts.HTTP.TemplateData),
http.WithLogger(s.opts.HTTP.Logger),
http.WithStats(s.stats),
)
if err := server.Serve(httpListener); err != nil {
@ -72,23 +56,6 @@ func (s *Server) Start() error {
}
}()
go func() {
defer listener.Close()
ticker := time.NewTicker(s.opts.StatsFileSaveInterval)
for {
<-ticker.C
slog.Info("saving stats", slog.String("file", s.opts.StatsFile), slog.Duration("interval", s.opts.StatsFileSaveInterval))
if err := s.stats.Save(s.opts.StatsFile); err != nil {
slog.Error("could not save stat file", slog.Any("error", errors.WithStack(err)))
return
}
}
}()
return nil
}
@ -117,7 +84,6 @@ func NewServer(funcs ...OptionFunc) *Server {
}
return &Server{
opts: opts,
stats: stat.NewStore(),
opts: opts,
}
}

16
ssh/direct_tcp_handler.go
View File

@ -77,13 +77,7 @@ func (s *Server) handleDirectTCP(srv *ssh.Server, conn *gossh.ServerConn, newCha
defer dconn.Close()
defer ch.Close()
reader := &instrumentedReader{
internal: dconn,
stats: s.opts.Stats,
name: StatTotalRxBytes,
}
if _, err := io.Copy(ch, reader); err != nil {
if _, err := io.Copy(ch, dconn); err != nil {
if errors.Is(err, net.ErrClosed) {
return
}
@ -96,13 +90,7 @@ func (s *Server) handleDirectTCP(srv *ssh.Server, conn *gossh.ServerConn, newCha
defer dconn.Close()
defer ch.Close()
writer := &instrumentedWriter{
internal: dconn,
stats: s.opts.Stats,
name: StatTotalTxBytes,
}
if _, err := io.Copy(writer, ch); err != nil {
if _, err := io.Copy(dconn, ch); err != nil {
s.log("[ERROR] %+v", errors.WithStack(err))
}
}()

14
ssh/options.go
View File

@ -1,10 +1,6 @@
package ssh
import (
"log"
"forge.cadoles.com/wpetit/rebound/stat"
)
import "log"
type Options struct {
Logger func(message string, args ...any)
@ -12,7 +8,6 @@ type Options struct {
PublicPort uint `env:"PUBLIC_PORT"`
PublicHost string `env:"PUBLIC_HOST"`
HostKey string `env:"HOST_KEY"`
Stats *stat.Store
}
type OptionFunc func(*Options)
@ -24,7 +19,6 @@ func DefaultOptions() *Options {
PublicPort: 2222,
PublicHost: "127.0.0.1",
HostKey: "./host.key",
Stats: stat.NewStore(),
}
}
@ -57,9 +51,3 @@ func WithLogger(logger func(message string, args ...any)) func(*Options) {
opts.Logger = logger
}
}
func WithStats(stats *stat.Store) func(*Options) {
return func(opts *Options) {
opts.Stats = stats
}
}

16
ssh/request_handler.go
View File

@ -80,19 +80,12 @@ func (s *Server) handleRequest(ctx ssh.Context, srv *ssh.Server, req *gossh.Requ
addr := s.getSocketPath(sessionID)
if err := s.ensureFileDir(addr); err != nil {
s.log("[ERROR] %+v", errors.WithStack(err))
return false, []byte("internal server error")
}
ln, err := net.Listen("unix", addr)
if err != nil {
s.log("[ERROR] %+v", errors.WithStack(err))
return false, []byte{}
}
s.opts.Stats.Add(StatTotalOpenedTunnels, 1, 0)
destPort := 1
s.requestHandlerLock.Lock()
@ -207,15 +200,6 @@ func (s *Server) getSocketPath(sessionID SessionID) string {
return filepath.Join(s.opts.SockDir, fmt.Sprintf("%s.sock", sessionID))
}
func (s *Server) ensureFileDir(file string) error {
dir := filepath.Dir(file)
if err := os.MkdirAll(dir, os.FileMode(0750)); err != nil {
return errors.WithStack(err)
}
return nil
}
func generateToken(length int) (string, error) {
chars := []rune(
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +

43
ssh/stats.go
View File

@ -1,43 +0,0 @@
package ssh
import (
"io"
"forge.cadoles.com/wpetit/rebound/stat"
)
const (
StatTotalOpenedTunnels = "total_opened_tunnels"
StatTotalTxBytes = "total_tx_bytes"
StatTotalRxBytes = "total_rx_bytes"
)
type instrumentedWriter struct {
name string
stats *stat.Store
internal io.Writer
}
// Write implements io.Writer.
func (w *instrumentedWriter) Write(p []byte) (n int, err error) {
n, err = w.internal.Write(p)
w.stats.Add(w.name, float64(n), 0)
return n, err
}
var _ io.Writer = &instrumentedWriter{}
type instrumentedReader struct {
name string
stats *stat.Store
internal io.Reader
}
// Read implements io.Reader.
func (w *instrumentedReader) Read(p []byte) (n int, err error) {
n, err = w.internal.Read(p)
w.stats.Add(w.name, float64(n), 0)
return n, err
}
var _ io.Reader = &instrumentedReader{}

154
stat/store.go
View File

@ -1,154 +0,0 @@
package stat
import (
"encoding/json"
"os"
"path/filepath"
"sync"
"log/slog"
"github.com/pkg/errors"
)
type Store struct {
data sync.Map
loadSaveLock sync.Mutex
}
func (s *Store) Load(path string) error {
s.loadSaveLock.Lock()
defer s.loadSaveLock.Unlock()
file, err := os.OpenFile(path, os.O_RDONLY, os.ModePerm)
if err != nil {
return errors.WithStack(err)
}
decoder := json.NewDecoder(file)
data := map[string]any{}
if err := decoder.Decode(&data); err != nil {
return errors.WithStack(err)
}
s.data.Range(func(key, value any) bool {
s.data.Delete(key)
return true
})
for k, v := range data {
s.data.Store(k, v)
}
return nil
}
func (s *Store) Save(path string) error {
s.loadSaveLock.Lock()
defer s.loadSaveLock.Unlock()
data, err := s.Snapshot()
if err != nil {
return errors.WithStack(err)
}
dir := filepath.Dir(path)
filename := filepath.Base(path)
temp, err := os.CreateTemp(dir, filename+".new*")
if err != nil {
return errors.WithStack(err)
}
defer func() {
if err := os.Remove(temp.Name()); err != nil && !errors.Is(err, os.ErrNotExist) {
slog.Error("could not remove temporary file",
slog.String("file", temp.Name()),
slog.Any("error", errors.WithStack(err)),
)
}
}()
encoder := json.NewEncoder(temp)
if err := encoder.Encode(data); err != nil {
return errors.WithStack(err)
}
if err := os.Rename(temp.Name(), path); err != nil {
return errors.WithStack(err)
}
return nil
}
func (s *Store) Snapshot() (map[string]float64, error) {
data := map[string]float64{}
var err error
s.data.Range(func(rawKey, rawValue any) bool {
key, ok := rawKey.(string)
if !ok {
err = errors.Errorf("unexpected stat key of '%v'", rawKey)
return false
}
value, ok := rawValue.(float64)
if !ok {
err = errors.Errorf("unexpected stat value of '%v'", rawValue)
return false
}
data[key] = value
return true
})
if err != nil {
return nil, errors.WithStack(err)
}
return data, nil
}
func (s *Store) Add(name string, added float64, defaultValue float64) float64 {
for {
value := s.Get(name, defaultValue)
if value == defaultValue {
s.data.Store(name, defaultValue)
}
sum := value + added
if s.data.CompareAndSwap(name, value, value+added) {
return sum
}
}
}
func (s *Store) Set(name string, value float64) float64 {
s.data.Store(name, value)
return value
}
func (s *Store) Get(name string, defaultValue float64) float64 {
rawValue, ok := s.data.Load(name)
if !ok {
return defaultValue
}
value, ok := rawValue.(float64)
if !ok {
return defaultValue
}
return value
}
func NewStore() *Store {
return &Store{
data: sync.Map{},
loadSaveLock: sync.Mutex{},
}
}