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Now cloudflare-ddns is faster and much lighter. It now checks and updates a DNS record with less than 20 allocations and using roughly 20 kilobyes of RAM, that is nothing compared to the 300+ allocations of the previous version, that used cpr. cloudflare-ddns now depends only on libcurl and libsimdjson, and should be much easier to package.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| name: CMake | ||
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| on: [push] | ||
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| jobs: | ||
| build: | ||
| runs-on: ubuntu-20.04 | ||
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| steps: | ||
| - uses: actions/checkout@v2 | ||
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| - name: Install dependencies | ||
| run: | | ||
| sudo rm /etc/apt/sources.list /etc/apt/sources.list.d/* | ||
| printf "Enabled: yes\nTypes: deb\nURIs: http://azure.archive.ubuntu.com/ubuntu/\nSuites: focal focal-updates focal-backports focal-security\nComponents: main universe\n" | sudo tee /etc/apt/sources.list.d/system.sources | ||
| sudo apt-get -qq update && sudo apt-get -qq install --assume-yes cmake libssl-dev | ||
| - name: Configure CMake | ||
| run: cmake -S . -B build -DCMAKE_BUILD_TYPE=Release | ||
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| - name: Build | ||
| run: cmake --build build | ||
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| - name: Test | ||
| run: ctest -C build | ||
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| - name: Store compiled program | ||
| uses: actions/upload-artifact@v2 | ||
| with: | ||
| name: cloudflare-ddns-static-main | ||
| path: ${{runner.workspace}}/cloudflare-ddns/build/cloudflare-ddns |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,59 +1,61 @@ | ||
| #include <cpr/cpr.h> | ||
| #include <curl/curl.h> | ||
| #include <string> | ||
| #include <iostream> | ||
| #include <simdjson.h> | ||
| #include <nlohmann/json.hpp> | ||
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| void libcurlSucks() { | ||
| curl_global_init(CURL_GLOBAL_SSL); | ||
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| CURL* curlHandle {curl_easy_init()}; | ||
| curl_easy_setopt(curlHandle, CURLOPT_NOPROGRESS, 1L); | ||
| curl_easy_setopt(curlHandle, CURLOPT_NOSIGNAL, 1L); | ||
| curl_easy_setopt(curlHandle, CURLOPT_HTTPGET, 1L); | ||
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| curl_global_cleanup(); | ||
| std::size_t writeData(char* incomingBuffer, std::size_t size, std::size_t count, std::string* data) { | ||
| data->append(incomingBuffer, size * count); | ||
| return size * count; | ||
| } | ||
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| int main(int argc, char* argv[]) { | ||
| if (argc != 4) { | ||
| std::cerr << "Usage: cloudflare-ddns <API token> <Zone ID> <DNS record name>\n"; | ||
| return EXIT_FAILURE; | ||
| } | ||
| const std::string apiToken {argv[1]}; | ||
| const std::string_view apiToken {argv[1]}; | ||
| const std::string zoneId {argv[2]}; | ||
| const std::string recordName {argv[3]}; | ||
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| CURL* curlHandle {curl_easy_init()}; | ||
| std::string response; | ||
| response.reserve(600); // Tipical size of largest response (GET to fetch the DNS IP) | ||
| curl_easy_setopt(curlHandle, CURLOPT_NOPROGRESS, 1L); | ||
| curl_easy_setopt(curlHandle, CURLOPT_NOSIGNAL, 1L); | ||
| curl_easy_setopt(curlHandle, CURLOPT_WRITEFUNCTION, writeData); | ||
| curl_easy_setopt(curlHandle, CURLOPT_WRITEDATA, &response); | ||
| curl_easy_setopt(curlHandle, CURLOPT_HTTPGET, 1L); | ||
| curl_easy_setopt(curlHandle, CURLOPT_URL, "https://1.1.1.1/cdn-cgi/trace"); | ||
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| simdjson::dom::parser parser; | ||
| const simdjson::dom::element parsed { | ||
| parser.parse( | ||
| cpr::Get( | ||
| cpr::Url{"https://api.cloudflare.com/client/v4/zones/" + zoneId + "/dns_records?type=A&name=" + recordName}, | ||
| cpr::Header{ | ||
| {"Content-Type", "application/json"}, | ||
| {"Authorization", "Bearer " + apiToken} | ||
| } | ||
| // cpr::Bearer{apiToken} in cpr 1.6 | ||
| ).text | ||
| ) | ||
| }; | ||
| curl_easy_perform(curlHandle); | ||
| const std::size_t ipBegin {response.find("ip=") + 3}; // + 3 because "ip=" is 3 chars | ||
| const std::size_t ipEnd {response.find('\n', ipBegin)}; | ||
| const std::string localIp {response.substr(ipBegin, ipEnd - ipBegin)}; | ||
| response.clear(); | ||
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| curl_easy_setopt(curlHandle, CURLOPT_URL, std::string{"https://api.cloudflare.com/client/v4/zones/" + zoneId + "/dns_records?type=A&name=" + recordName}.data()); | ||
| curl_easy_setopt(curlHandle, CURLOPT_HTTPAUTH, CURLAUTH_BEARER); | ||
| curl_easy_setopt(curlHandle, CURLOPT_XOAUTH2_BEARER, apiToken.data()); | ||
| struct curl_slist* headers {nullptr}; | ||
| headers = curl_slist_append(headers, "Content-Type: application/json"); | ||
| curl_easy_setopt(curlHandle, CURLOPT_HTTPHEADER, headers); | ||
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| const std::string trace {cpr::Get(cpr::Url{"https://1.1.1.1/cdn-cgi/trace"}).text}; | ||
| const std::size_t ipBegin {trace.find("ip=") + 3}; // + 3 because "ip=" is 3 chars | ||
| const std::size_t ipEnd {trace.find('\n', ipBegin)}; | ||
| const std::string_view currentIp {std::string_view{trace}.substr(ipBegin, ipEnd - ipBegin)}; // Begin, length | ||
| curl_easy_perform(curlHandle); | ||
| simdjson::dom::parser parser; | ||
| const simdjson::dom::element parsed {parser.parse(response)}; | ||
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| if (currentIp != static_cast<std::string_view>((*parsed["result"].begin())["content"])) { | ||
| std::cout << "New IP: " << (parser.parse(cpr::Patch( | ||
| cpr::Url{"https://api.cloudflare.com/client/v4/zones/" + zoneId + "/dns_records/" + std::string{static_cast<std::string_view>((*parsed["result"].begin())["id"])}}, | ||
| cpr::Header{ | ||
| {"Content-Type", "application/json"}, | ||
| {"Authorization", "Bearer " + apiToken} | ||
| }, | ||
| cpr::Body{nlohmann::json{{"content", currentIp}}.dump()} | ||
| ).text))["result"]["content"] << '\n'; | ||
| if (localIp != static_cast<std::string_view>((*parsed["result"].begin())["content"])) { | ||
| response.clear(); | ||
| curl_easy_setopt(curlHandle, CURLOPT_URL, std::string{"https://api.cloudflare.com/client/v4/zones/" + zoneId + "/dns_records/" + std::string{static_cast<std::string_view>((*parsed["result"].begin())["id"])}}.c_str()); | ||
| // curl_easy_setopt(curlHandle, CURLOPT_NOBODY, 0L); | ||
| curl_easy_setopt(curlHandle, CURLOPT_CUSTOMREQUEST, "PATCH"); | ||
| std::string request {R"({"content": ")" + localIp + "\"}"}; | ||
| curl_easy_setopt(curlHandle, CURLOPT_POSTFIELDS, request.c_str()); | ||
| curl_easy_perform(curlHandle); | ||
| std::cout << "New IP: " << parser.parse(response)["result"]["content"] << '\n'; | ||
| } | ||
| else { | ||
| std::cout << "The DNS is up to date\n"; | ||
| } | ||
| curl_easy_cleanup(curlHandle); | ||
| } |
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