Initial working version

.gitignore

+# Created by .ignore support plugin (hsz.mobi)
+
+### User config
+config.json
+
+### Go template
+# Binaries for programs and plugins
+*.exe
+*.dll
+*.so
+*.dylib
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736
+.glide/
+### macOS template
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff:
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/dictionaries
+
+# Sensitive or high-churn files:
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+.idea/**/dataSources.ids
+.idea/**/dataSources.xml
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+
+# Gradle:
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# CMake
+cmake-build-debug/
+
+# Mongo Explorer plugin:
+.idea/**/mongoSettings.xml
+
+## File-based project format:
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties

README.md

+dyndnsd-client
+==============
+
+Client for the [`dyndnsd`](https://github.com/cmur2/dyndnsd) daemon.

config-sample.json

+{
+  "username": "",
+  "password": "",
+  "protocol": "http",
+  "host": "",
+  "port": 8245,
+  "path": "",
+  "dns_hostname": "",
+  "ipv4_endpoint": "http://whatismyip.akamai.com/",
+  "ipv6_endpoint": "http://ipv6.whatismyip.akamai.com/"
+}
\ No newline at end of file

dyndnsd-client.go

 package main
 
+import (
+	"fmt"
+	"github.com/joshbetz/config"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+)
+
+var (
+	cfg          *config.Config
+	ipv4Endpoint string
+	ipv6Endpoint string
+)
+
+// Parse config
+func init() {
+	cfg = config.New("config.json")
+
+	cfg.Get("ipv4_endpoint", &ipv4Endpoint)
+	cfg.Get("ipv6_endpoint", &ipv6Endpoint)
+}
+
+// Do the update!
 func main() {
+	// Base URL
+	endpoint, err := buildEndpointUrl()
+	if err != nil {
+		return
+	}
+
+	// IPv4 is required
+	ipv4, err := getUrl(ipv4Endpoint)
+	if err == nil {
+		query := endpoint.Query()
+		query.Set("myip", ipv4)
+		endpoint.RawQuery = query.Encode()
+	} else {
+		return
+	}
+
+	fmt.Println(endpoint)
+
+	// IPv6 is optional
+	ipv6, err := getUrl(ipv6Endpoint)
+	if err == nil {
+		query := endpoint.Query()
+		query.Set("myip6", ipv6)
+		endpoint.RawQuery = query.Encode()
+	}
+
+	// Send the update
+	dyndns, err := getUrl(endpoint.String())
+	if err != nil {
+		return
+	}
+
+	// TODO: better formatting
+	fmt.Println(dyndns)
+}
+
+// Build endpoint URL from configuration
+func buildEndpointUrl() (*url.URL, error) {
+	var username string
+	var password string
+	var protocol string
+	var host string
+	var port int
+	var path string
+	var hostname string
+
+	cfg.Get("username", &username)
+	cfg.Get("password", &password)
+	cfg.Get("protocol", &protocol)
+	cfg.Get("host", &host)
+	cfg.Get("port", &port)
+	cfg.Get("path", &path)
+	cfg.Get("dns_hostname", &hostname)
+
+	daemonUrl, err := url.Parse("")
+	if err != nil {
+		return nil, err
+	}
+
+	daemonUrl.Scheme = protocol
+	daemonUrl.Host = fmt.Sprintf("%s:%d", host, port)
+	daemonUrl.Path = path
+
+	userInfo := url.UserPassword(username, password)
+	daemonUrl.User = userInfo
+
+	query := daemonUrl.Query()
+	query.Set("hostname", hostname)
+	daemonUrl.RawQuery = query.Encode()
+
+	return daemonUrl, nil
+}
+
+// Retrieve given URL
+func getUrl(url string) (string, error) {
+	resp, err := http.Get(url)
+	if err != nil {
+		return "", err
+	}
+
+	defer resp.Body.Close()
+	respBody, err := ioutil.ReadAll(resp.Body)
+
+	if err != nil {
+		return "", err
+	}
+
+	respBodyString := string(respBody)
+	return respBodyString, nil
 }