Merge pull request #30 from shizunge/dependabot/go_modules/github.com/pierrre/geohash-1.1.0

Bump github.com/pierrre/geohash from 1.0.0 to 1.1.0

.github/dependabot.yml

@@ -0,0 +1,19 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "gomod"
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "github-actions"
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "docker"
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"

.github/workflows/docker-hub-build-push-on-release.yml

@@ -0,0 +1,62 @@
+name: Build docker image and push to docker hub on release
+
+on:
+  release:
+    types: # This configuration does not affect the page_build event above
+      - created
+env:
+  PLATFORMS: "linux/amd64,linux/386,linux/arm64,linux/arm/v7,linux/arm/v6,linux/s390x"
+  
+jobs:
+  build_and_push:
+    name: Build and push Docker image
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        
+      - name: Extract tag string
+        id: git
+        shell: bash
+        run: |
+          RELEASE_VERSION=${GITHUB_REF#refs/*/}
+          echo "::set-output name=image_tag::${RELEASE_VERSION}"
+          echo "Action image_tag=${RELEASE_VERSION}"
+      
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+        
+      - name: Install buildx
+        uses: docker/setup-buildx-action@v2.0.0
+        
+      - name: Login to docker hub
+        uses: docker/login-action@v2.0.0
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2.0.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ github.token }}
+        
+      - name: Build and push ${{ github.repository }}:${{ steps.git.outputs.image_tag }}
+        uses: docker/build-push-action@v3.1.1
+        with:
+          platforms: ${{ env.PLATFORMS }}
+          push: true
+          tags: |
+            ${{ github.repository }}:${{ steps.git.outputs.image_tag }}
+            ${{ github.repository }}:latest
+            ghcr.io/${{ github.repository }}:${{ steps.git.outputs.image_tag }}
+            ghcr.io/${{ github.repository }}:latest
+
+      - name: Update dockerhub description
+        uses: peter-evans/dockerhub-description@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+          repository: ${{ github.repository }}
+          short-description: ${{ github.event.repository.description }}

Dockerfile

@@ -0,0 +1,19 @@
+FROM golang:alpine AS build
+
+ADD . /go/src/app
+WORKDIR /go/src/app
+RUN go mod tidy
+RUN go build -o endlessh .
+
+FROM alpine:latest
+
+LABEL org.opencontainers.image.title=endlessh-go
+LABEL org.opencontainers.image.description="Endlessh: an SSH tarpit"
+LABEL org.opencontainers.image.vendor="Shizun Ge"
+LABEL org.opencontainers.image.licenses=GPLv3
+
+COPY --from=build /go/src/app/endlessh /usr/bin/endlessh
+EXPOSE 2222 2112
+USER nobody
+ENTRYPOINT  ["/usr/bin/endlessh"]
+CMD ["-logtostderr", "-v=1"]

LICENSE

@@ -0,0 +1,674 @@
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+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+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 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 General Public License for more details.
+
+    You should have received a copy of the GNU 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 the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  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 GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

README.md

@@ -0,0 +1,120 @@
+# endlessh-go
+
+A golang implementation of [endlessh](https://nullprogram.com/blog/2019/03/22/) exporting Prometheus metrics, visualized by a Grafana dashboard.
+
+![screenshot](https://github.com/shizunge/endlessh-go/raw/master/dashboard/screenshot.png)
+
+## Introduction
+
+Endlessh is a great idea that not only blocks the brute force SSH attacks, but also wastes attackers time as a kind of counter-attack. Besides trapping the attackers, I also want to visualize the Geolocations and other statistics of the sources of attacks. Unfortunately the wonderful original [C implementation of endlessh](https://github.com/skeeto/endlessh) only provides text based log, but I do not like the solution that writing extra scripts to parse the log outputs, then exporting the results to a dashboard, because it would introduce extra layers in my current setup and it would depend on the format of the text log file rather than some structured data. Thus I create this golang implementation of endlessh to export [Prometheus](https://prometheus.io/) metrics and a [Grafana](https://grafana.com/) dashboard to visualize them.
+
+If you want a dashboard of sources of attacks and do not mind the endlessh server, besides trapping the attackers, does extra things including: translating IP to Geohash, exporting Prometheus metrics, and using more memory (about 10MB), this is the solution for you.
+
+## Getting Started
+
+Clone the repo then build from source:
+
+```
+go build .
+./endlessh-go &
+```
+
+Alternatively, you can use the [docker image](https://hub.docker.com/r/shizunge/endlessh-go):
+
+```
+sudo docker run -d -p 2222:2222 shizunge/endlessh-go -logtostderr -v=1
+```
+
+It listens to port `2222` by default.
+
+Then you can try to connect to the endlessh server. Your SSH client should hang there.
+
+```
+ssh -p 2222 localhost
+```
+
+If you want log like the [C implementation](https://github.com/skeeto/endlessh), you need to set both CLI arguments `-logtostderr` and `-v=1`, then the log will go to stderr. You can set different log destinations via CLI arguments.
+
+Also check out [examples](./examples/README.md) for the setup of the full stack.
+
+## Usage
+
+`./endlessh-go --help`
+
+```
+Usage of ./endlessh-go
+  -alsologtostderr
+        log to standard error as well as files
+  -conn_type string
+        Connection type. Possible values are tcp, tcp4, tcp6 (default "tcp")
+  -enable_prometheus
+        Enable prometheus
+  -geoip_supplier string
+        Supplier to obtain Geohash of IPs. Possible values are "off", "ip-api", "freegeoip", "max-mind-db" (default "off")
+  -host string
+        SSH listening address (default "0.0.0.0")
+  -interval_ms int
+        Message millisecond delay (default 1000)
+  -line_length int
+        Maximum banner line length (default 32)
+  -log_backtrace_at value
+        when logging hits line file:N, emit a stack trace
+  -log_dir string
+        If non-empty, write log files in this directory
+  -logtostderr
+        log to standard error instead of files
+  -max_clients int
+        Maximum number of clients (default 4096)
+  -max_mind_db string
+        Path to the MaxMind DB file.
+  -port string
+        SSH listening port (default "2222")
+  -prometheus_entry string
+        Entry point for prometheus (default "metrics")
+  -prometheus_host string
+        The address for prometheus (default "0.0.0.0")
+  -prometheus_port string
+        The port for prometheus (default "2112")
+  -stderrthreshold value
+        logs at or above this threshold go to stderr
+  -v value
+        log level for V logs
+  -vmodule value
+        comma-separated list of pattern=N settings for file-filtered logging
+```
+
+## Metrics
+
+Endlessh-go exports the following Prometheus metrics.
+
+| Metric                               | Type  | Description  |
+|--------------------------------------|-------|--------------|
+| endlessh_client_open_count_total     | count | Total number of clients that tried to connect to this host. |
+| endlessh_client_closed_count_total   | count | Total number of clients that stopped connecting to this host. |
+| endlessh_sent_bytes_total            | count | Total bytes sent to clients that tried to connect to this host. |
+| endlessh_trapped_time_seconds_total  | count | Total seconds clients spent on endlessh. |
+| endlessh_client_open_count           | count | Number of connections of clients. <br> Labels: <br> <ul><li> `ip`: IP of the client </li> <li>  `country`: Country of the IP </li> <li>  `location`: Country, Region, and City </li> <li>  `geohash`: Geohash of the location </li></ul> |
+| endlessh_client_trapped_time_seconds | count | Seconds a client spends on endlessh. <br> Labels: <br> <ul><li>  `ip`: IP of the client </li></ul> |
+
+The metrics is off by default, you can turn it via the CLI argument `-enable_prometheus`.
+
+It listens to port `2112` and entry point is `/metrics` by default. The port and entry point can be changed via CLI arguments.
+
+The endlessh-go server stores the geohash of attackers as a label on `endlessh_client_open_count`, which is also off by default. You can turn it on via the CLI argument `-geoip_supplier`. The endlessh-go uses service from either [ip-api](https://ip-api.com/) or [freegeoip](https://freegeoip.live/), which may enforce a query rate and limit commercial use. Visit their website for their terms and policies.
+
+You could also use an offline GeoIP database from [MaxMind](https://www.maxmind.com) by setting `-geoip_supplier` to *max-mind-db* and `-max_mind_db` to the path of the database file.
+
+## Dashboard
+
+The dashboard requires Grafana 8.2.
+
+You can import the dashboard from Grafana.com using ID [15156](https://grafana.com/grafana/dashboards/15156)
+
+The dashboard visualizes data for the selected time range.
+
+The IP addresses are clickable and link you to the [ARIN](https://www.arin.net/) database.
+
+
+## Contacts
+
+If you have any problems or questions, please contact me through a [GitHub issue](https://github.com/shizunge/endlessh-go/issues)

client.go

@@ -0,0 +1,111 @@
+// Copyright (C) 2021 Shizun Ge
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+package main
+
+import (
+	"math/rand"
+	"net"
+	"sync/atomic"
+	"time"
+
+	"github.com/golang/glog"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+var letterBytes = []byte(" abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890!@#$%^&*()-=_+[]{}|;:',./<>?")
+
+func randStringBytes(n int64) []byte {
+	b := make([]byte, n+1)
+	for i := range b {
+		b[i] = letterBytes[rand.Intn(len(letterBytes))]
+	}
+	b[n] = '\n'
+	return b
+}
+
+type client struct {
+	conn              net.Conn
+	last              time.Time
+	next              time.Time
+	start             time.Time
+	interval          time.Duration
+	geoipSupplier     string
+	geohash           string
+	country           string
+	location          string
+	bytesSent         int
+	prometheusEnabled bool
+}
+
+func NewClient(conn net.Conn, interval time.Duration, maxClient int64, geoipSupplier string, prometheusEnabled bool) *client {
+	addr := conn.RemoteAddr().(*net.TCPAddr)
+	atomic.AddInt64(&numCurrentClients, 1)
+	atomic.AddInt64(&numTotalClients, 1)
+	geohash, country, location, err := geohashAndLocation(addr.IP.String(), geoipSupplier)
+	if err != nil {
+		glog.Warningf("Failed to obatin the geohash of %v: %v.", addr.IP, err)
+	}
+	if prometheusEnabled {
+		clientIP.With(prometheus.Labels{
+			"ip":       addr.IP.String(),
+			"geohash":  geohash,
+			"country":  country,
+			"location": location}).Inc()
+	}
+	glog.V(1).Infof("ACCEPT host=%v port=%v n=%v/%v\n", addr.IP, addr.Port, numCurrentClients, maxClient)
+	return &client{
+		conn:              conn,
+		last:              time.Now(),
+		next:              time.Now().Add(interval),
+		start:             time.Now(),
+		interval:          interval,
+		geohash:           geohash,
+		country:           country,
+		location:          location,
+		bytesSent:         0,
+		prometheusEnabled: prometheusEnabled,
+	}
+}
+
+func (c *client) Send(bannerMaxLength int64) error {
+	defer func(c *client) {
+		addr := c.conn.RemoteAddr().(*net.TCPAddr)
+		millisecondsSpent := time.Now().Sub(c.last).Milliseconds()
+		c.last = time.Now()
+		c.next = time.Now().Add(c.interval)
+		atomic.AddInt64(&numTotalMilliseconds, millisecondsSpent)
+		if c.prometheusEnabled {
+			clientSeconds.With(prometheus.Labels{"ip": addr.IP.String()}).Add(float64(millisecondsSpent) / 1000)
+		}
+	}(c)
+	length := rand.Int63n(bannerMaxLength)
+	bytesSent, err := c.conn.Write(randStringBytes(length))
+	if err != nil {
+		return err
+	}
+	c.bytesSent += bytesSent
+	atomic.AddInt64(&numTotalBytes, int64(bytesSent))
+	return nil
+}
+
+func (c *client) Close() {
+	addr := c.conn.RemoteAddr().(*net.TCPAddr)
+	atomic.AddInt64(&numCurrentClients, -1)
+	atomic.AddInt64(&numTotalClientsClosed, 1)
+	glog.V(1).Infof("CLOSE host=%v port=%v time=%v bytes=%v\n", addr.IP, addr.Port, time.Now().Sub(c.start).Seconds(), c.bytesSent)
+	c.conn.Close()
+}

examples/README.md

@@ -0,0 +1,6 @@
+# Examples
+
+## docker-simple
+
+An example how to setup endlessh-go, Prometheus, and Grafana using [docker compose](https://docs.docker.com/compose/).
+

examples/docker-simple/README.md

@@ -0,0 +1,22 @@
+## docker compose
+
+This is an example how to setup endlessh-go, Prometheus, and Grafana using [docker compose](https://docs.docker.com/compose/). The reference of the compose file can be found [here](https://docs.docker.com/compose/compose-file/).
+
+*prometheus.yml* is used as a [Prometheus configuration](https://prometheus.io/docs/prometheus/latest/configuration/configuration/).
+
+*grafana-datasource.yml* is used to provision a data source for Grafana to ease the setup, though Grafana data source can also be setup manually.
+
+To start the stack, in the *examples* folder, run:
+
+```
+sudo docker-compose up -d
+```
+
+This example exposes the following ports. Except the SSH port, you should not expose other ports to public without protections (not included in this example) in production.
+
+* **2222**: The SSH port. You may test endlessh-go by running `ssh -p 2222 localhost`. Your SSH client should hang. View the log of endlessh-go by running `sudo docker logs endlessh`.
+* **2112**: The Prometheus metrics exported by endlessh-go. Go to [http://localhost:2112/metrics](http://localhost:2112/metrics) in your web browser to view the metrics.
+* **9090**: Prometheus web interface. Go to [http://localhost:9090](http://localhost:9090) in your web browser for Prometheus. You can check whether the target of endlessh-go is up (Click Status, then Targets).
+* **3000**: Grafana. Go to [http://localhost:3000](http://localhost:3000) in your web browser for Grafana. Use username *examples* and password *examples* to login.
+
+In this example, we do not provision a dashboard for Grafana. You need to manually load the endlessh-go dashboard, by either importing it from the Grafana.com using ID [15156](https://grafana.com/grafana/dashboards/15156), or pasting the dashboard JSON text to the text area. See the [Grafana documentation](https://grafana.com/docs/grafana/latest/dashboards/export-import/) about import. Then select *Prometheus* as the data source.

examples/docker-simple/docker-compose.yml

@@ -0,0 +1,60 @@
+version: '3.5'
+services:
+  endlessh:
+    container_name: endlessh
+    image: shizunge/endlessh-go:latest
+    restart: always
+    command:
+      - -interval_ms=1000
+      - -logtostderr
+      - -v=1
+      - -enable_prometheus
+      - -geoip_supplier=ip-api
+    networks:
+      - example_network
+    ports:
+      # SSH port
+      - 2222:2222
+      # Prometheus metrics port
+      - 127.0.0.1:2112:2112
+
+  prometheus:
+    image: prom/prometheus:latest
+    container_name: prometheus
+    restart: always
+    command: 
+      - --config.file=/etc/prometheus/prometheus.yml
+      - --storage.tsdb.path=/prometheus
+      - --storage.tsdb.retention.time=45d
+      - --web.console.libraries=/usr/share/prometheus/console_libraries
+      - --web.console.templates=/usr/share/prometheus/consoles
+      - --web.enable-admin-api
+    networks:
+      - example_network
+    ports:
+      - 127.0.0.1:9090:9090
+    volumes:
+      - ./prometheus.yml:/etc/prometheus/prometheus.yml
+      - prometheus:/prometheus
+
+  grafana:
+    image: grafana/grafana:latest
+    container_name: grafana
+    restart: always
+    networks:
+      - example_network
+    ports:
+      - 127.0.0.1:3000:3000
+    environment:
+      - GF_SECURITY_ADMIN_USER=examples
+      - GF_SECURITY_ADMIN_PASSWORD=examples
+    volumes:
+      - grafana_var:/var/lib/grafana/
+      - ./grafana-datasource.yml:/etc/grafana/provisioning/datasources/prometheus.yml
+
+networks:
+  example_network:
+
+volumes:
+  prometheus:
+  grafana_var:

examples/docker-simple/grafana-datasource.yml

@@ -0,0 +1,6 @@
+apiVersion: 1
+
+datasources:
+  - name: Prometheus
+    type: prometheus
+    url: http://prometheus:9090

examples/docker-simple/prometheus.yml

@@ -0,0 +1,5 @@
+scrape_configs:
+  - job_name: 'endlessh'
+    scrape_interval: 60s
+    static_configs:
+      - targets: ['endlessh:2112']

geoip.go

@@ -0,0 +1,170 @@
+// Copyright (C) 2021 Shizun Ge
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"strings"
+
+	"github.com/oschwald/geoip2-golang"
+	"github.com/pierrre/geohash"
+)
+
+var (
+	maxMindDbFileName *string
+)
+
+func composeLocation(country string, region string, city string) string {
+	var locations []string
+	for _, s := range []string{country, region, city} {
+		if strings.TrimSpace(s) != "" {
+			locations = append(locations, s)
+		}
+	}
+	location := strings.Join(locations, ", ")
+	if location == "" {
+		return "Unknown"
+	}
+	return location
+}
+
+func composeCountry(country string) string {
+	if country == "" {
+		return "Unknown"
+	}
+	return country
+}
+
+type freegeoip struct {
+	Ip          string  `json:"ip"`
+	CountryCode string  `json:"country_code"`
+	CountryName string  `json:"country_name"`
+	RegionCode  string  `json:"region_code"`
+	RegionName  string  `json:"region_name"`
+	City        string  `json:"city"`
+	Zipcode     string  `json:"zipcode"`
+	Latitude    float64 `json:"latitude"`
+	Longitude   float64 `json:"longitude"`
+	MetroCode   int     `json:"metro_code"`
+	AreaCode    int     `json:"area_code"`
+}
+
+func geohashAndLocationFromFreegeoip(address string) (string, string, string, error) {
+	var geo freegeoip
+	response, err := http.Get("https://freegeoip.live/json/" + address)
+	if err != nil {
+		return "s000", "Unknown", "Unknown", err
+	}
+	defer response.Body.Close()
+
+	body, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return "s000", "Unknown", "Unknown", err
+	}
+
+	err = json.Unmarshal(body, &geo)
+	if err != nil {
+		return "s000", "Unknown", "Unknown", err
+	}
+
+	gh := geohash.EncodeAuto(geo.Latitude, geo.Longitude)
+	country := composeCountry(geo.CountryName)
+	location := composeLocation(geo.CountryName, geo.RegionName, geo.City)
+
+	return gh, country, location, nil
+}
+
+type ipapi struct {
+	Status      string  `json:"status"`
+	Message     string  `json:"message"`
+	Ip          string  `json:"query"`
+	CountryCode string  `json:"countryCode"`
+	CountryName string  `json:"country"`
+	RegionCode  string  `json:"region"`
+	RegionName  string  `json:"regionName"`
+	City        string  `json:"city"`
+	Zipcode     string  `json:"zip"`
+	Latitude    float64 `json:"lat"`
+	Longitude   float64 `json:"lon"`
+}
+
+func geohashAndLocationFromIpapi(address string) (string, string, string, error) {
+	var geo ipapi
+	response, err := http.Get("http://ip-api.com/json/" + address)
+	if err != nil {
+		return "s000", "Unknown", "Unknown", err
+	}
+	defer response.Body.Close()
+
+	body, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return "s000", "Unknown", "Unknown", err
+	}
+
+	err = json.Unmarshal(body, &geo)
+	if err != nil {
+		return "s000", "Unknown", "Unknown", err
+	}
+
+	if geo.Status != "success" {
+		return "s000", "Unknown", "Unknown", fmt.Errorf("failed to query %v via ip-api: status: %v, message: %v", address, geo.Status, geo.Message)
+	}
+
+	gh := geohash.EncodeAuto(geo.Latitude, geo.Longitude)
+	country := composeCountry(geo.CountryName)
+	location := composeLocation(geo.CountryName, geo.RegionName, geo.City)
+
+	return gh, country, location, nil
+}
+
+func geohashAndLocationFromMaxMindDb(address string) (string, string, string, error) {
+	db, err := geoip2.Open(*maxMindDbFileName)
+	if err != nil {
+		return "s000", "Unknown", "Unknown", err
+	}
+	defer db.Close()
+	// If you are using strings that may be invalid, check that ip is not nil
+	ip := net.ParseIP(address)
+	record, err := db.City(ip)
+	if err != nil {
+		return "s000", "Unknown", "Unknown", err
+	}
+	gh := geohash.EncodeAuto(record.Location.Latitude, record.Location.Longitude)
+	country := composeCountry(record.Country.Names["en"])
+	location := composeLocation(record.Country.Names["en"], "", record.City.Names["en"])
+
+	return gh, country, location, nil
+}
+
+func geohashAndLocation(address string, geoipSupplier string) (string, string, string, error) {
+	switch geoipSupplier {
+	case "off":
+		return "s000", "Geohash off", "Geohash off", nil
+	case "ip-api":
+		return geohashAndLocationFromIpapi(address)
+	case "freegeoip":
+		return geohashAndLocationFromFreegeoip(address)
+	case "max-mind-db":
+		return geohashAndLocationFromMaxMindDb(address)
+	default:
+		return "s000", "Unknown", "Unknown", fmt.Errorf("unknown geoipSupplier %v.", geoipSupplier)
+	}
+}

go.mod

@@ -1,3 +1,23 @@
 module endlessh-go
 
-go 1.17
+go 1.18
+
+require (
+	github.com/golang/glog v1.0.0
+	github.com/oschwald/geoip2-golang v1.8.0
+	github.com/pierrre/geohash v1.1.0
+	github.com/prometheus/client_golang v1.13.0
+)
+
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/oschwald/maxminddb-golang v1.10.0 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.37.0 // indirect
+	github.com/prometheus/procfs v0.8.0 // indirect
+	golang.org/x/sys v0.0.0-20220804214406-8e32c043e418 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
+)

go.sum

@@ -0,0 +1,495 @@
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main.go

@@ -1,68 +1,107 @@
-package main
+// Copyright (C) 2021 Shizun Ge
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
 
-//  echo -n "test out the server" | nc localhost 3333
+package main
 
 import (
 	"flag"
 	"fmt"
 	"math/rand"
 	"net"
+	"net/http"
 	"os"
-	"sync/atomic"
 	"time"
+
+	"github.com/golang/glog"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
 var (
-	numCurrentClients int64
-	numTotalClients   uint64
-	numTotalBytes     uint64
+	numCurrentClients     int64
+	numTotalClients       int64
+	numTotalClientsClosed int64
+	numTotalBytes         int64
+	numTotalMilliseconds  int64
+	totalClients          prometheus.CounterFunc
+	totalClientsClosed    prometheus.CounterFunc
+	totalBytes            prometheus.CounterFunc
+	totalSeconds          prometheus.CounterFunc
+	clientIP              *prometheus.CounterVec
+	clientSeconds         *prometheus.CounterVec
 )
 
-var letterBytes = []byte(" abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890!@#$%^&*()-=_+[]{}|;:',./<>?")
-
-func randStringBytes(n int64) []byte {
-	b := make([]byte, n+1)
-	for i := range b {
-		b[i] = letterBytes[rand.Intn(len(letterBytes))]
-	}
-	b[n] = '\n'
-	return b
-}
-
-type client struct {
-	conn       net.Conn
-	next       time.Time
-	start      time.Time
-	bytes_sent int
-}
-
-func NewClient(conn net.Conn, interval time.Duration, maxClient int64) *client {
-	atomic.AddInt64(&numCurrentClients, 1)
-	atomic.AddUint64(&numTotalClients, 1)
-	fmt.Printf("%v ACCEPT host=%v n=%v/%v\n", time.Now(), conn.RemoteAddr(), numCurrentClients, maxClient)
-	return &client{
-		conn:       conn,
-		next:       time.Now().Add(interval),
-		start:      time.Now(),
-		bytes_sent: 0,
-	}
-}
-
-func (c *client) Send(bannerMaxLength int64) error {
-	length := rand.Int63n(bannerMaxLength)
-	bytes_sent, err := c.conn.Write(randStringBytes(length))
-	if err != nil {
-		return err
-	}
-	c.bytes_sent += bytes_sent
-	atomic.AddUint64(&numTotalBytes, uint64(bytes_sent))
-	return nil
-}
-
-func (c *client) Close() {
-	atomic.AddInt64(&numCurrentClients, -1)
-	fmt.Printf("%v CLOSE host=%v time=%v bytes=%v\n", time.Now(), c.conn.RemoteAddr(), time.Now().Sub(c.start), c.bytes_sent)
-	c.conn.Close()
+func initPrometheus(prometheusHost, prometheusPort, prometheusEntry string) {
+	totalClients = prometheus.NewCounterFunc(
+		prometheus.CounterOpts{
+			Name: "endlessh_client_open_count_total",
+			Help: "Total number of clients that tried to connect to this host.",
+		}, func() float64 {
+			return float64(numTotalClients)
+		},
+	)
+	totalClientsClosed = prometheus.NewCounterFunc(
+		prometheus.CounterOpts{
+			Name: "endlessh_client_closed_count_total",
+			Help: "Total number of clients that stopped connecting to this host.",
+		}, func() float64 {
+			return float64(numTotalClientsClosed)
+		},
+	)
+	totalBytes = prometheus.NewCounterFunc(
+		prometheus.CounterOpts{
+			Name: "endlessh_sent_bytes_total",
+			Help: "Total bytes sent to clients that tried to connect to this host.",
+		}, func() float64 {
+			return float64(numTotalBytes)
+		},
+	)
+	totalSeconds = prometheus.NewCounterFunc(
+		prometheus.CounterOpts{
+			Name: "endlessh_trapped_time_seconds_total",
+			Help: "Total seconds clients spent on endlessh.",
+		}, func() float64 {
+			return float64(numTotalMilliseconds) / 1000
+		},
+	)
+	clientIP = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "endlessh_client_open_count",
+			Help: "Number of connections of clients.",
+		},
+		[]string{"ip", "geohash", "country", "location"},
+	)
+	clientSeconds = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "endlessh_client_trapped_time_seconds",
+			Help: "Seconds a client spends on endlessh.",
+		},
+		[]string{"ip"},
+	)
+	prometheus.MustRegister(totalClients)
+	prometheus.MustRegister(totalClientsClosed)
+	prometheus.MustRegister(totalBytes)
+	prometheus.MustRegister(totalSeconds)
+	prometheus.MustRegister(clientIP)
+	prometheus.MustRegister(clientSeconds)
+	http.Handle("/"+prometheusEntry, promhttp.Handler())
+	go func() {
+		glog.Infof("Starting Prometheus on %v:%v, entry point is /%v", prometheusHost, prometheusPort, prometheusEntry)
+		http.ListenAndServe(prometheusHost+":"+prometheusPort, nil)
+	}()
 }
 
 func main() {
@@ -70,28 +109,45 @@ func main() {
 	bannerMaxLength := flag.Int64("line_length", 32, "Maximum banner line length")
 	maxClients := flag.Int64("max_clients", 4096, "Maximum number of clients")
 	connType := flag.String("conn_type", "tcp", "Connection type. Possible values are tcp, tcp4, tcp6")
-	connHost := flag.String("host", "localhost", "Listening address")
-	connPort := flag.String("port", "2222", "Listening port")
+	connHost := flag.String("host", "0.0.0.0", "SSH listening address")
+	connPort := flag.String("port", "2222", "SSH listening port")
+	prometheusEnabled := flag.Bool("enable_prometheus", false, "Enable prometheus")
+	prometheusHost := flag.String("prometheus_host", "0.0.0.0", "The address for prometheus")
+	prometheusPort := flag.String("prometheus_port", "2112", "The port for prometheus")
+	prometheusEntry := flag.String("prometheus_entry", "metrics", "Entry point for prometheus")
+	geoipSupplier := flag.String("geoip_supplier", "off", "Supplier to obtain Geohash of IPs. Possible values are \"off\", \"ip-api\", \"freegeoip\", \"max-mind-db\"")
+	maxMindDbFileName = flag.String("max_mind_db", "", "Path to the MaxMind DB file.")
+
 	flag.Usage = func() {
 		fmt.Fprintf(flag.CommandLine.Output(), "Usage of %v \n", os.Args[0])
 		flag.PrintDefaults()
 	}
 	flag.Parse()
 
+	if *connType == "tcp6" && *prometheusHost == "0.0.0.0" {
+		*prometheusHost = "[::]"
+	}
+	if *prometheusEnabled {
+		initPrometheus(*prometheusHost, *prometheusPort, *prometheusEntry)
+	}
+
 	rand.Seed(time.Now().UnixNano())
 	interval := time.Duration(*intervalMs) * time.Millisecond
 	// Listen for incoming connections.
+	if *connType == "tcp6" && *connHost == "0.0.0.0" {
+		*connHost = "[::]"
+	}
 	l, err := net.Listen(*connType, *connHost+":"+*connPort)
 	if err != nil {
-		fmt.Println("Error listening:", err.Error())
+		glog.Errorf("Error listening: %v", err)
 		os.Exit(1)
 	}
 	// Close the listener when the application closes.
 	defer l.Close()
-	fmt.Println("Listening on " + *connHost + ":" + *connPort)
+	glog.Infof("Listening on %v:%v", *connHost, *connPort)
 
 	clients := make(chan *client, *maxClients)
-	go func(clients chan *client, interval time.Duration, bannerMaxLength int64) {
+	go func() {
 		for {
 			c, more := <-clients
 			if !more {
@@ -100,26 +156,28 @@ func main() {
 			if time.Now().Before(c.next) {
 				time.Sleep(c.next.Sub(time.Now()))
 			}
-			err := c.Send(bannerMaxLength)
+			err := c.Send(*bannerMaxLength)
 			if err != nil {
 				c.Close()
 				continue
 			}
-			c.next = time.Now().Add(interval)
 			go func() { clients <- c }()
 		}
-	}(clients, interval, *bannerMaxLength)
-	for {
-		// Listen for an incoming connection.
-		conn, err := l.Accept()
-		if err != nil {
-			fmt.Println("Error accepting: ", err.Error())
-			os.Exit(1)
+	}()
+	listener := func() {
+		for {
+			// Listen for an incoming connection.
+			conn, err := l.Accept()
+			if err != nil {
+				glog.Errorf("Error accepting: %v", err)
+				os.Exit(1)
+			}
+			// Handle connections in a new goroutine.
+			for numCurrentClients >= *maxClients {
+				time.Sleep(interval)
+			}
+			clients <- NewClient(conn, interval, *maxClients, *geoipSupplier, *prometheusEnabled)
 		}
-		// Handle connections in a new goroutine.
-		for numCurrentClients >= *maxClients {
-			time.Sleep(interval)
-		}
-		clients <- NewClient(conn, interval, *maxClients)
 	}
+	listener()
 }