fix CGO_ENABLE again

set CGO_ENABLED to 0
Add CGO_ENABLED=1 to Dockerfile
2023-06-25 23:32:15 -07:00 · 2023-06-25 22:58:30 -07:00 · 2023-06-25 22:55:09 -07:00 · 2023-06-24 23:40:55 -07:00 · 2023-06-19 17:51:58 -07:00 · 2023-06-20 00:50:25 +00:00
20 changed files with 1207 additions and 665 deletions
--- a/.github/dependabot.yml
+++ b/.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"
--- a/.github/workflows/docker-hub-build-push.yml
+++ b/.github/workflows/docker-hub-build-push.yml
@@ -1,25 +0,0 @@
-name: build docker image and push to docker hub
-
-on:
-  release:
-    types: # This configuration does not affect the page_build event above
-      - created
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - name: checkout code
-        uses: actions/checkout@v2
-      - name: install buildx
-        id: buildx
-        uses: crazy-max/ghaction-docker-buildx@v1
-        with:
-          version: latest
-      - name: login to docker hub
-        run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
-      - name: build the image
-        run: |
-          docker buildx build --push \
-            --tag shizunge/endlessh-go:latest \
-            --platform linux/amd64,linux/arm/v7,linux/arm64 .
--- a/.github/workflows/on-push-main.yml
+++ b/.github/workflows/on-push-main.yml
@@ -0,0 +1,55 @@
+name: On push to main
+
+on:
+  push:
+    branches:
+      - main
+
+env:
+  PLATFORMS: "linux/amd64,linux/arm64,linux/arm/v7"
+  
+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="dev-$(date +%s)"
+          echo "image_tag=${RELEASE_VERSION}" >> ${GITHUB_OUTPUT}
+      
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+        
+      - name: Install buildx
+        uses: docker/setup-buildx-action@v2.7.0
+        
+      - name: Login to docker hub
+        uses: docker/login-action@v2.2.0
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2.2.0
+        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@v4.1.1
+        with:
+          platforms: ${{ env.PLATFORMS }}
+          push: true
+          tags: |
+            ${{ github.repository }}:${{ steps.git.outputs.image_tag }}
+            ${{ github.repository }}:development
+            ghcr.io/${{ github.repository }}:${{ steps.git.outputs.image_tag }}
+            ghcr.io/${{ github.repository }}:development
+
--- a/.github/workflows/on-release.yml
+++ b/.github/workflows/on-release.yml
@@ -0,0 +1,61 @@
+name: On release
+
+on:
+  release:
+    types: # This configuration does not affect the page_build event above
+      - created
+env:
+  PLATFORMS: "linux/amd64,linux/arm64,linux/arm/v7"
+  
+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=${GITHUB_REF#refs/*/}
+          echo "image_tag=${RELEASE_VERSION}" >> ${GITHUB_OUTPUT}
+      
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+        
+      - name: Install buildx
+        uses: docker/setup-buildx-action@v2.7.0
+        
+      - name: Login to docker hub
+        uses: docker/login-action@v2.2.0
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2.2.0
+        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@v4.1.1
+        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 }}
--- a/15
+++ b/15
@@ -1,19 +1,20 @@
-FROM golang:alpine AS build
+FROM golang AS build

-ADD . /go/src/app
-WORKDIR /go/src/app
+RUN mkdir /endlessh
+ADD . /endlessh
+WORKDIR /endlessh
 RUN go mod tidy
-RUN go build -o endlessh .
+RUN CGO_ENABLED=0 go build -o endlessh .

-FROM alpine:latest
+FROM gcr.io/distroless/base

 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
+COPY --from=build /endlessh/endlessh /endlessh
 EXPOSE 2222 2112
 USER nobody
-ENTRYPOINT  ["/usr/bin/endlessh"]
+ENTRYPOINT  ["/endlessh"]
 CMD ["-logtostderr", "-v=1"]
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@

 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/main/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.
@@ -20,7 +22,7 @@ go build .
 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
+sudo docker run -d -p 2222:2222 shizunge/endlessh-go -logtostderr -v=1
 ```

 It listens to port `2222` by default.
@@ -31,50 +33,59 @@ Then you can try to connect to the endlessh server. Your SSH client should hang
 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 the stderr. You can set different log destinations via CLI arguments.
+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

-Usage of `./endlessh-go`
+`./endlessh-go --help`

-* -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" (default "off")
-* -host string
-  * 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)
-* -port string
-  * Listening port (default "2222")
-* -prometheus_entry string
-  * Entry point for prometheus (default "metrics")
-* -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
+```
+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", "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

-This golang implementation exports the following Prometheus metrics.
+Endlessh-go exports the following Prometheus metrics.

 | Metric                               | Type  | Description  |
 |--------------------------------------|-------|--------------|
@@ -89,14 +100,20 @@ The metrics is off by default, you can turn it via the CLI argument `-enable_pro

 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.
+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 [ip-api](https://ip-api.com/), 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

-![screenshot](dashboard/screenshot.png)
-
 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)
--- a/coordinates/country.go
+++ b/coordinates/country.go
@@ -0,0 +1,264 @@
+// Copyright (C) 2023 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 coordinates
+
+// Map country's ISO to their capital's latitude and longitude.
+// Country's ISO see https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
+type Location struct {
+	Latitude  float64
+	Longitude float64
+}
+
+var Country = map[string]Location{
+	"AD": {42.5, 1.5},
+	"AE": {24.4511, 54.3969},
+	"AF": {34.5328, 69.1658},
+	"AG": {17.1211, -61.8447},
+	"AI": {18.2167, -63.05},
+	"AL": {41.33, 19.82},
+	"AM": {40.1814, 44.5144},
+	"AO": {-8.8383, 13.2344},
+	"AR": {-34.5997, -58.3819},
+	"AS": {-14.274, -170.7046},
+	"AT": {48.2083, 16.3725},
+	"AU": {-35.2931, 149.1269},
+	"AW": {12.5186, -70.0358},
+	"AZ": {40.3667, 49.8352},
+	"BA": {43.8563, 18.4132},
+	"BB": {13.0975, -59.6167},
+	"BD": {23.7289, 90.3944},
+	"BE": {50.8353, 4.3314},
+	"BF": {12.3686, -1.5275},
+	"BG": {42.6979, 23.3217},
+	"BH": {26.225, 50.5775},
+	"BI": {-3.3825, 29.3611},
+	"BJ": {6.402, 2.518},
+	"BL": {17.8958, -62.8508},
+	"BM": {32.2942, -64.7839},
+	"BN": {4.9167, 114.9167},
+	"BO": {-16.4942, -68.1475},
+	"BR": {-15.7939, -47.8828},
+	"BS": {25.0667, -77.3333},
+	"BT": {27.4833, 89.6333},
+	"BW": {-24.6569, 25.9086},
+	"BY": {53.9022, 27.5618},
+	"BZ": {17.25, -88.7675},
+	"CA": {45.4247, -75.695},
+	"CD": {-4.3317, 15.3139},
+	"CF": {4.3732, 18.5628},
+	"CG": {-4.2667, 15.2833},
+	"CH": {46.948, 7.4474},
+	"CI": {5.3364, -4.0267},
+	"CK": {-21.207, -159.771},
+	"CL": {-33.45, -70.6667},
+	"CM": {3.8578, 11.5181},
+	"CN": {39.904, 116.4075},
+	"CO": {4.6126, -74.0705},
+	"CR": {9.9333, -84.0833},
+	"CU": {23.1367, -82.3589},
+	"CV": {14.9177, -23.5092},
+	"CW": {12.108, -68.935},
+	"CX": {-10.4167, 105.7167},
+	"CY": {35.1725, 33.365},
+	"CZ": {50.0833, 14.4167},
+	"DE": {52.5167, 13.3833},
+	"DJ": {11.595, 43.1481},
+	"DK": {55.6805, 12.5615},
+	"DM": {15.3, -61.3833},
+	"DO": {18.4764, -69.8933},
+	"DZ": {36.7764, 3.0586},
+	"EC": {-0.22, -78.5125},
+	"EE": {59.4372, 24.745},
+	"EG": {30.0444, 31.2358},
+	"ER": {15.3333, 38.9167},
+	"ES": {40.4167, -3.7167},
+	"ET": {9.0272, 38.7369},
+	"FI": {60.1756, 24.9342},
+	"FJ": {-18.1333, 178.4333},
+	"FK": {-51.7, -57.85},
+	"FM": {6.9178, 158.185},
+	"FO": {62, -6.7833},
+	"FR": {48.8566, 2.3522},
+	"GA": {0.3901, 9.4544},
+	"GB": {51.5072, -0.1275},
+	"GD": {12.0444, -61.7417},
+	"GE": {41.7225, 44.7925},
+	"GF": {4.933, -52.33},
+	"GH": {5.6037, -0.187},
+	"GI": {36.1324, -5.3781},
+	"GL": {64.175, -51.7333},
+	"GM": {13.4531, -16.5775},
+	"GN": {9.538, -13.6773},
+	"GP": {16.0104, -61.7055},
+	"GQ": {3.7521, 8.7737},
+	"GR": {37.9842, 23.7281},
+	"GS": {-54.2833, -36.5},
+	"GT": {14.6099, -90.5252},
+	"GU": {13.4745, 144.7504},
+	"GW": {11.8592, -15.5956},
+	"GY": {6.7833, -58.1667},
+	"HK": {22.3069, 114.1831},
+	"HN": {14.0942, -87.2067},
+	"HR": {45.8131, 15.9772},
+	"HT": {18.5425, -72.3386},
+	"HU": {47.4983, 19.0408},
+	"ID": {-6.2146, 106.8451},
+	"IE": {53.3497, -6.2603},
+	"IL": {31.7833, 35.2167},
+	"IM": {54.15, -4.4819},
+	"IN": {28.6139, 77.209},
+	"IQ": {33.35, 44.4167},
+	"IR": {35.7, 51.4167},
+	"IS": {64.1475, -21.935},
+	"IT": {41.8931, 12.4828},
+	"JE": {49.1858, -2.11},
+	"JM": {17.9714, -76.7931},
+	"JO": {31.95, 35.9333},
+	"JP": {35.6839, 139.7744},
+	"KE": {-1.2864, 36.8172},
+	"KG": {42.8667, 74.5667},
+	"KH": {11.5696, 104.921},
+	"KI": {1.3382, 173.0176},
+	"KM": {-11.7036, 43.2536},
+	"KN": {17.2983, -62.7342},
+	"KP": {39.03, 125.73},
+	"KR": {37.56, 126.99},
+	"KW": {29.375, 47.98},
+	"KY": {19.2866, -81.3744},
+	"KZ": {51.1333, 71.4333},
+	"LA": {17.9667, 102.6},
+	"LB": {33.8869, 35.5131},
+	"LC": {14.0167, -60.9833},
+	"LI": {47.1397, 9.5219},
+	"LK": {6.9, 79.9164},
+	"LR": {6.3106, -10.8047},
+	"LS": {-29.31, 27.48},
+	"LT": {54.6833, 25.2833},
+	"LU": {49.6106, 6.1328},
+	"LV": {56.9475, 24.1069},
+	"LY": {32.8752, 13.1875},
+	"MA": {26.0928, -10.6089},
+	"MC": {43.7396, 7.4069},
+	"MD": {47.0228, 28.8353},
+	"ME": {42.4397, 19.2661},
+	"MF": {18.0706, -63.0847},
+	"MG": {-18.9386, 47.5214},
+	"MH": {7.0918, 171.3802},
+	"MK": {41.9833, 21.4333},
+	"ML": {12.6458, -7.9922},
+	"MM": {16.795, 96.16},
+	"MN": {47.9214, 106.9055},
+	"MP": {15.2137, 145.7546},
+	"MQ": {14.6104, -61.08},
+	"MR": {18.0858, -15.9785},
+	"MS": {16.7928, -62.2106},
+	"MT": {35.8978, 14.5125},
+	"MU": {-20.1667, 57.5},
+	"MV": {4.175, 73.5083},
+	"MW": {-13.9833, 33.7833},
+	"MX": {19.4333, -99.1333},
+	"MY": {3.1478, 101.6953},
+	"MZ": {-25.9153, 32.5764},
+	"NA": {-22.57, 17.0836},
+	"NC": {-22.2625, 166.4443},
+	"NE": {13.5086, 2.1111},
+	"NF": {-29.0569, 167.9617},
+	"NG": {9.0556, 7.4914},
+	"NI": {12.15, -86.2667},
+	"NL": {52.08, 4.31},
+	"NO": {59.9111, 10.7528},
+	"NP": {27.7167, 85.3667},
+	"NR": {-0.5477, 166.9209},
+	"NU": {-19.056, -169.921},
+	"NZ": {-41.2889, 174.7772},
+	"OM": {23.6139, 58.5922},
+	"PA": {9, -79.5},
+	"PE": {-12.06, -77.0375},
+	"PF": {-17.5334, -149.5667},
+	"PG": {-9.4789, 147.1494},
+	"PH": {14.6, 120.9833},
+	"PK": {33.6989, 73.0369},
+	"PL": {52.23, 21.0111},
+	"PM": {46.7811, -56.1764},
+	"PN": {-25.0667, -130.0833},
+	"PR": {18.4037, -66.0636},
+	"PT": {38.708, -9.139},
+	"PW": {7.5006, 134.6242},
+	"PY": {-25.3, -57.6333},
+	"QA": {25.3, 51.5333},
+	"RE": {-20.8789, 55.4481},
+	"RO": {44.4, 26.0833},
+	"RS": {44.8167, 20.4667},
+	"RU": {55.7558, 37.6178},
+	"RW": {-1.9536, 30.0606},
+	"SA": {24.65, 46.71},
+	"SB": {-9.4333, 159.95},
+	"SC": {-4.6236, 55.4544},
+	"SD": {15.6031, 32.5265},
+	"SE": {59.3294, 18.0686},
+	"SG": {1.3, 103.8},
+	"SH": {-15.9251, -5.7179},
+	"SI": {46.05, 14.5167},
+	"SK": {48.1447, 17.1128},
+	"SL": {8.4833, -13.2331},
+	"SM": {43.932, 12.4484},
+	"SN": {14.7319, -17.4572},
+	"SO": {2.0408, 45.3425},
+	"SR": {5.8667, -55.1667},
+	"SS": {4.85, 31.6},
+	"ST": {0.3333, 6.7333},
+	"SV": {13.6989, -89.1914},
+	"SX": {18.0256, -63.0492},
+	"SY": {33.5131, 36.2919},
+	"SZ": {-26.3208, 31.1617},
+	"TC": {21.4664, -71.136},
+	"TD": {12.11, 15.05},
+	"TG": {6.1319, 1.2228},
+	"TH": {13.75, 100.5167},
+	"TJ": {38.5731, 68.7864},
+	"TL": {-8.5536, 125.5783},
+	"TM": {37.95, 58.3833},
+	"TN": {36.8008, 10.18},
+	"TO": {-21.1347, -175.2083},
+	"TR": {39.93, 32.85},
+	"TT": {10.6667, -61.5167},
+	"TV": {-8.5243, 179.1942},
+	"TZ": {-6.8, 39.2833},
+	"UA": {50.45, 30.5236},
+	"UG": {0.3136, 32.5811},
+	"US": {38.9047, -77.0163},
+	"UY": {-34.8667, -56.1667},
+	"UZ": {41.3, 69.2667},
+	"VA": {41.9033, 12.4534},
+	"VC": {13.1667, -61.2333},
+	"VE": {10.5, -66.9333},
+	"VG": {18.4167, -64.6167},
+	"VI": {18.3419, -64.9332},
+	"VN": {21.0245, 105.8412},
+	"VU": {-17.7333, 168.3167},
+	"WF": {-13.2825, -176.1736},
+	"WS": {-13.8333, -171.8333},
+	"XG": {31.5069, 34.456},
+	"XK": {42.6633, 21.1622},
+	"XR": {78.2167, 15.6333},
+	"XW": {31.7764, 35.2269},
+	"YE": {15.35, 44.2},
+	"YT": {-12.7871, 45.275},
+	"ZA": {-25.7464, 28.1881},
+	"ZM": {-15.4167, 28.2833},
+	"ZW": {-17.8292, 31.0522},
+}
--- a/dashboard/endlessh.json
+++ b/dashboard/endlessh.json
--- a/BIN
+++ b/BIN
--- a/examples/README.md
+++ b/examples/README.md
@@ -0,0 +1,18 @@
+# Examples
+
+> The default container user has uid 65534.
+
+## docker-simple
+
+An example how to setup endlessh-go, Prometheus, and Grafana using [docker compose](https://docs.docker.com/compose/).
+
+## docker-maxmind
+
+An example how to setup endlessh-go with the Maxmind GeoIP Database.
+
+## FAQ
+### Bind to privileged ports (<1024) in a container
+
+You need to add capability `NET_BIND_SERVICE` to the program.
+
+If you are using docker, this can be done via cli argument [`--cap-add`](https://docs.docker.com/engine/reference/run/#runtime-privilege-and-linux-capabilities) or [`cap_add`](https://docs.docker.com/compose/compose-file/compose-file-v3/#cap_add-cap_drop) in the docker compose file.
--- a/examples/docker-maxmind/README.md
+++ b/examples/docker-maxmind/README.md
@@ -0,0 +1,16 @@
+## docker compose
+
+This is an example how to setup endlessh-go with the Maxmind GeoIP Database 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/).
+
+To start the stack, in the _examples_ folder, run:
+
+```
+sudo docker-compose up -d
+```
+
+The GeoIP Database will be saved in a mounted volume in: `./geo-data`. And the endlessh-go container will use this database to do the location lookups.
+
+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.
--- a/examples/docker-maxmind/docker-compose.yml
+++ b/examples/docker-maxmind/docker-compose.yml
@@ -0,0 +1,36 @@
+version: "3"
+services:
+
+  endlessh:
+    container_name: endlessh
+    image: shizunge/endlessh-go:latest
+    restart: unless-stopped
+    #user: root
+    command:
+      - "-logtostderr"
+      - "-v=1"
+      - "-geoip_supplier=max-mind-db"
+      - "-max_mind_db=/geo-data/GeoLite2-City.mmdb"
+    networks:
+      - example_network
+    ports:
+      - 2222:2222 # SSH port
+      - 127.0.0.1:2112:2112 # Prometheus metrics port
+    volumes:
+      - ./geo-data/:/geo-data/:ro # geoip data
+
+  geoipupdate:
+    image: ghcr.io/maxmind/geoipupdate:v5
+    container_name: geoipupdate
+    restart: unless-stopped
+    security_opt: [ "no-new-privileges:true" ]
+    volumes:
+      - ./geo-data/:/usr/share/GeoIP/
+    environment:
+      - GEOIPUPDATE_EDITION_IDS=GeoLite2-City
+      - GEOIPUPDATE_FREQUENCY=72
+      - GEOIPUPDATE_ACCOUNT_ID=xxxxxx
+      - GEOIPUPDATE_LICENSE_KEY=xxxxxx
+
+networks:
+  example_network:
--- a/examples/docker-simple/README.md
+++ b/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.
--- a/examples/docker-simple/docker-compose.yml
+++ b/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:
+      - 2222:2222 # SSH port
+      - 127.0.0.1:2112:2112 # Prometheus metrics port
+
+  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:
--- a/examples/docker-simple/grafana-datasource.yml
+++ b/examples/docker-simple/grafana-datasource.yml
@@ -0,0 +1,6 @@
+apiVersion: 1
+
+datasources:
+  - name: Prometheus
+    type: prometheus
+    url: http://prometheus:9090
--- a/examples/docker-simple/prometheus.yml
+++ b/examples/docker-simple/prometheus.yml
@@ -0,0 +1,5 @@
+scrape_configs:
+  - job_name: 'endlessh'
+    scrape_interval: 60s
+    static_configs:
+      - targets: ['endlessh:2112']
--- a/geoip.go
+++ b/geoip.go
@@ -1,4 +1,4 @@
-// Copyright (C) 2021 Shizun Ge
+// Copyright (C) 2021-2023 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
@@ -20,61 +20,39 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"net"
 	"net/http"
 	"strings"

+	"endlessh-go/coordinates"
+
+	"github.com/oschwald/geoip2-golang"
 	"github.com/pierrre/geohash"
 )

-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
-	}
+var (
+	maxMindDbFileName *string
+)

+func composeLocation(country string, region string, city string) string {
 	var locations []string
-	for _, s := range []string{geo.CountryName, geo.RegionName, geo.City} {
+	for _, s := range []string{country, region, city} {
 		if strings.TrimSpace(s) != "" {
 			locations = append(locations, s)
 		}
 	}
 	location := strings.Join(locations, ", ")
 	if location == "" {
-		location = "Unknown"
+		return "Unknown"
 	}
-	country := geo.CountryName
-	if country == "" {
-		country = "Unknown"
-	}
-	gh := geohash.EncodeAuto(geo.Latitude, geo.Longitude)
+	return location
+}

-	return gh, country, location, nil
+func composeCountry(country string) string {
+	if country == "" {
+		return "Unknown"
+	}
+	return country
 }

 type ipapi struct {
@@ -113,21 +91,46 @@ func geohashAndLocationFromIpapi(address string) (string, string, string, error)
 		return "s000", "Unknown", "Unknown", fmt.Errorf("failed to query %v via ip-api: status: %v, message: %v", address, geo.Status, geo.Message)
 	}

-	var locations []string
-	for _, s := range []string{geo.CountryName, geo.RegionName, geo.City} {
-		if strings.TrimSpace(s) != "" {
-			locations = append(locations, s)
+	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)
+	cityRecord, err := db.City(ip)
+	if err != nil {
+		return "s000", "Unknown", "Unknown", err
+	}
+	countryName := cityRecord.Country.Names["en"]
+	cityName := cityRecord.City.Names["en"]
+	latitude := cityRecord.Location.Latitude
+	longitude := cityRecord.Location.Longitude
+	iso := cityRecord.Country.IsoCode
+	if latitude == 0 && longitude == 0 {
+		// In case of using Country DB, city is not available.
+		loc, ok := coordinates.Country[iso]
+		if ok {
+			latitude = loc.Latitude
+			longitude = loc.Longitude
+		} else {
+			if iso != "" {
+				// For debugging, adding the iso to the country name.
+				countryName = countryName + " (" + iso + ")"
+			}
 		}
 	}
-	location := strings.Join(locations, ", ")
-	if location == "" {
-		location = "Unknown"
-	}
-	country := geo.CountryName
-	if country == "" {
-		country = "Unknown"
-	}
-	gh := geohash.EncodeAuto(geo.Latitude, geo.Longitude)
+	gh := geohash.EncodeAuto(latitude, longitude)
+	country := composeCountry(countryName)
+	location := composeLocation(countryName, "", cityName)

 	return gh, country, location, nil
 }
@@ -138,8 +141,8 @@ func geohashAndLocation(address string, geoipSupplier string) (string, string, s
 		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)
 	}
--- a/go.mod
+++ b/go.mod
@@ -1,21 +1,23 @@
 module endlessh-go

-go 1.17
+go 1.20

 require (
-	github.com/golang/glog v1.0.0
-	github.com/pierrre/geohash v1.0.0
-	github.com/prometheus/client_golang v1.11.0
+	github.com/golang/glog v1.1.1
+	github.com/oschwald/geoip2-golang v1.9.0
+	github.com/pierrre/geohash v1.1.0
+	github.com/prometheus/client_golang v1.16.0
 )

 require (
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cespare/xxhash/v2 v2.1.1 // indirect
-	github.com/golang/protobuf v1.4.3 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
-	github.com/prometheus/client_model v0.2.0 // indirect
-	github.com/prometheus/common v0.26.0 // indirect
-	github.com/prometheus/procfs v0.6.0 // indirect
-	golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40 // indirect
-	google.golang.org/protobuf v1.26.0-rc.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
+	github.com/oschwald/maxminddb-golang v1.11.0 // indirect
+	github.com/prometheus/client_model v0.3.0 // indirect
+	github.com/prometheus/common v0.42.0 // indirect
+	github.com/prometheus/procfs v0.10.1 // indirect
+	golang.org/x/sys v0.9.0 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
 )
--- a/go.sum
+++ b/go.sum
@@ -1,156 +1,48 @@
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 github.com/Codefor/geohash v0.0.0-20140723084247-1b41c28e3a9d h1:iG9B49Q218F/XxXNRM7k/vWf7MKmLIS8AcJV9cGN4nA=
-github.com/Codefor/geohash v0.0.0-20140723084247-1b41c28e3a9d/go.mod h1:RVnhzAX71far8Kc3TQeA0k/dcaEKUnTDSOyet/JCmGI=
 github.com/TomiHiltunen/geohash-golang v0.0.0-20150112065804-b3e4e625abfb h1:wumPkzt4zaxO4rHPBrjDK8iZMR41C1qs7njNqlacwQg=
-github.com/TomiHiltunen/geohash-golang v0.0.0-20150112065804-b3e4e625abfb/go.mod h1:QiYsIBRQEO+Z4Rz7GoI+dsHVneZNONvhczuA+llOZNM=
-github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
-github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
-github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/broady/gogeohash v0.0.0-20120525094510-7b2c40d64042 h1:iEdmkrNMLXbM7ecffOAtZJQOQUTE4iMonxrb5opUgE4=
-github.com/broady/gogeohash v0.0.0-20120525094510-7b2c40d64042/go.mod h1:f1L9YvXvlt9JTa+A17trQjSMM6bV40f+tHjB+Pi+Fqk=
-github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
-github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/fanixk/geohash v0.0.0-20150324002647-c1f9b5fa157a h1:Fyfh/dsHFrC6nkX7H7+nFdTd1wROlX/FxEIWVpKYf1U=
-github.com/fanixk/geohash v0.0.0-20150324002647-c1f9b5fa157a/go.mod h1:UgNw+PTmmGN8rV7RvjvnBMsoTU8ZXXnaT3hYsDTBlgQ=
-github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
-github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
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-golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40 h1:JWgyZ1qgdTaF3N3oxC+MdTV7qvEEgHo3otj+HB5CM7Q=
-golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+golang.org/x/sys v0.9.0 h1:KS/R3tvhPqvJvwcKfnBHJwwthS11LRhmM5D59eEXa0s=
+golang.org/x/sys v0.9.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
-google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
-google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
-google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.26.0-rc.1 h1:7QnIQpGRHE5RnLKnESfDoxm2dTapTZua5a0kS0A+VXQ=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.30.0 h1:kPPoIgf3TsEvrm0PFe15JQ+570QVxYzEvvHqChK+cng=
+google.golang.org/protobuf v1.30.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
--- a/main.go
+++ b/main.go
@@ -1,4 +1,4 @@
-// Copyright (C) 2021 Shizun Ge
+// Copyright (C) 2021-2023 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
@@ -44,7 +44,7 @@ var (
 	clientSeconds         *prometheus.CounterVec
 )

-func initPrometheus(connHost, prometheusPort, prometheusEntry string) {
+func initPrometheus(prometheusHost, prometheusPort, prometheusEntry string) {
 	totalClients = prometheus.NewCounterFunc(
 		prometheus.CounterOpts{
 			Name: "endlessh_client_open_count_total",
@@ -99,8 +99,8 @@ func initPrometheus(connHost, prometheusPort, prometheusEntry string) {
 	prometheus.MustRegister(clientSeconds)
 	http.Handle("/"+prometheusEntry, promhttp.Handler())
 	go func() {
-		glog.Infof("Starting Prometheus on %v:%v, entry point is /%v", connHost, prometheusPort, prometheusEntry)
-		http.ListenAndServe(connHost+":"+prometheusPort, nil)
+		glog.Infof("Starting Prometheus on %v:%v, entry point is /%v", prometheusHost, prometheusPort, prometheusEntry)
+		http.ListenAndServe(prometheusHost+":"+prometheusPort, nil)
 	}()
 }

@@ -109,12 +109,14 @@ 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", "0.0.0.0", "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\"")
+	geoipSupplier := flag.String("geoip_supplier", "off", "Supplier to obtain Geohash of IPs. Possible values are \"off\", \"ip-api\", \"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])
@@ -122,8 +124,11 @@ func main() {
 	}
 	flag.Parse()

+	if *connType == "tcp6" && *prometheusHost == "0.0.0.0" {
+		*prometheusHost = "[::]"
+	}
 	if *prometheusEnabled {
-		initPrometheus(*connHost, *prometheusPort, *prometheusEntry)
+		initPrometheus(*prometheusHost, *prometheusPort, *prometheusEntry)
 	}

 	rand.Seed(time.Now().UnixNano())