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+/*
+ * librdkafka - Apache Kafka C library
+ *
+ * Copyright (c) 2021, Magnus Edenhill
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * OpenSSL engine integration example. This example fetches metadata
+ * over SSL connection with broker, established using OpenSSL engine.
+ */
+
+#include <iostream>
+#include <string>
+#include <cstdlib>
+#include <cstdio>
+#include <csignal>
+#include <cstring>
+
+#ifdef _WIN32
+#include "../win32/wingetopt.h"
+#elif _AIX
+#include <unistd.h>
+#else
+#include <getopt.h>
+#endif
+
+/*
+ * Typically include path in a real application would be
+ * #include <librdkafka/rdkafkacpp.h>
+ */
+#include "rdkafkacpp.h"
+
+static void metadata_print(const RdKafka::Metadata *metadata) {
+ std::cout << "Number of topics: " << metadata->topics()->size() << std::endl;
+
+ /* Iterate topics */
+ RdKafka::Metadata::TopicMetadataIterator it;
+ for (it = metadata->topics()->begin(); it != metadata->topics()->end(); ++it)
+ std::cout << " " << (*it)->topic() << " has "
+ << (*it)->partitions()->size() << " partitions." << std::endl;
+}
+
+
+class PrintingSSLVerifyCb : public RdKafka::SslCertificateVerifyCb {
+ /* This SSL cert verification callback simply prints the incoming
+ * parameters. It provides no validation, everything is ok. */
+ public:
+ bool ssl_cert_verify_cb(const std::string &broker_name,
+ int32_t broker_id,
+ int *x509_error,
+ int depth,
+ const char *buf,
+ size_t size,
+ std::string &errstr) {
+ std::cout << "ssl_cert_verify_cb :"
+ << ": broker_name=" << broker_name << ", broker_id=" << broker_id
+ << ", x509_error=" << *x509_error << ", depth=" << depth
+ << ", buf size=" << size << std::endl;
+
+ return true;
+ }
+};
+
+
+int main(int argc, char **argv) {
+ std::string brokers;
+ std::string errstr;
+ std::string engine_path;
+ std::string ca_location;
+
+ /*
+ * Create configuration objects
+ */
+ RdKafka::Conf *conf = RdKafka::Conf::create(RdKafka::Conf::CONF_GLOBAL);
+ std::string engine_id;
+ std::string engine_callback_data;
+ int opt;
+
+ if (conf->set("security.protocol", "ssl", errstr) != RdKafka::Conf::CONF_OK) {
+ std::cerr << errstr << std::endl;
+ exit(1);
+ }
+
+ while ((opt = getopt(argc, argv, "b:p:c:t:d:i:e:X:")) != -1) {
+ switch (opt) {
+ case 'b':
+ brokers = optarg;
+ break;
+ case 'p':
+ engine_path = optarg;
+ break;
+ case 'c':
+ ca_location = optarg;
+ break;
+ case 'i':
+ engine_id = optarg;
+ break;
+ case 'e':
+ engine_callback_data = optarg;
+ break;
+ case 'd':
+ if (conf->set("debug", optarg, errstr) != RdKafka::Conf::CONF_OK) {
+ std::cerr << errstr << std::endl;
+ exit(1);
+ }
+ break;
+ case 'X': {
+ char *name, *val;
+
+ name = optarg;
+ if (!(val = strchr(name, '='))) {
+ std::cerr << "%% Expected -X property=value, not " << name << std::endl;
+ exit(1);
+ }
+
+ *val = '\0';
+ val++;
+
+ if (conf->set(name, val, errstr) != RdKafka::Conf::CONF_OK) {
+ std::cerr << errstr << std::endl;
+ exit(1);
+ }
+ } break;
+
+ default:
+ goto usage;
+ }
+ }
+
+ if (brokers.empty() || engine_path.empty() || optind != argc) {
+ usage:
+ std::string features;
+ conf->get("builtin.features", features);
+ fprintf(stderr,
+ "Usage: %s [options] -b <brokers> -p <engine-path> \n"
+ "\n"
+ "OpenSSL engine integration example. This example fetches\n"
+ "metadata over SSL connection with broker, established using\n"
+ "OpenSSL engine.\n"
+ "\n"
+ "librdkafka version %s (0x%08x, builtin.features \"%s\")\n"
+ "\n"
+ " Options:\n"
+ " -b <brokers> Broker address\n"
+ " -p <engine-path> Path to OpenSSL engine\n"
+ " -i <engine-id> OpenSSL engine id\n"
+ " -e <engine-callback-data> OpenSSL engine callback_data\n"
+ " -c <ca-cert-location> File path to ca cert\n"
+ " -d [facs..] Enable debugging contexts: %s\n"
+ " -X <prop=name> Set arbitrary librdkafka configuration"
+ " property\n"
+ "\n",
+ argv[0], RdKafka::version_str().c_str(), RdKafka::version(),
+ features.c_str(), RdKafka::get_debug_contexts().c_str());
+ exit(1);
+ }
+
+ if (conf->set("bootstrap.servers", brokers, errstr) !=
+ RdKafka::Conf::CONF_OK) {
+ std::cerr << errstr << std::endl;
+ exit(1);
+ }
+
+ if (conf->set("ssl.engine.location", engine_path, errstr) !=
+ RdKafka::Conf::CONF_OK) {
+ std::cerr << errstr << std::endl;
+ exit(1);
+ }
+
+ if (ca_location.length() > 0 && conf->set("ssl.ca.location", ca_location,
+ errstr) != RdKafka::Conf::CONF_OK) {
+ std::cerr << errstr << std::endl;
+ exit(1);
+ }
+
+ if (engine_id.length() > 0 &&
+ conf->set("ssl.engine.id", engine_id, errstr) != RdKafka::Conf::CONF_OK) {
+ std::cerr << errstr << std::endl;
+ exit(1);
+ }
+
+ /* engine_callback_data needs to be persistent
+ * and outlive the lifetime of the Kafka client handle. */
+ if (engine_callback_data.length() > 0 &&
+ conf->set_engine_callback_data((void *)engine_callback_data.c_str(),
+ errstr) != RdKafka::Conf::CONF_OK) {
+ std::cerr << errstr << std::endl;
+ exit(1);
+ }
+
+ /* We use the Certificiate verification callback to print the
+ * certificate name being used. */
+ PrintingSSLVerifyCb ssl_verify_cb;
+
+ if (conf->set("ssl_cert_verify_cb", &ssl_verify_cb, errstr) !=
+ RdKafka::Conf::CONF_OK) {
+ std::cerr << errstr << std::endl;
+ exit(1);
+ }
+
+ /*
+ * Create producer using accumulated global configuration.
+ */
+ RdKafka::Producer *producer = RdKafka::Producer::create(conf, errstr);
+ if (!producer) {
+ std::cerr << "Failed to create producer: " << errstr << std::endl;
+ exit(1);
+ }
+
+ std::cout << "% Created producer " << producer->name() << std::endl;
+
+ class RdKafka::Metadata *metadata;
+
+ /* Fetch metadata */
+ RdKafka::ErrorCode err = producer->metadata(true, NULL, &metadata, 5000);
+ if (err != RdKafka::ERR_NO_ERROR)
+ std::cerr << "%% Failed to acquire metadata: " << RdKafka::err2str(err)
+ << std::endl;
+
+ metadata_print(metadata);
+
+ delete metadata;
+ delete producer;
+ delete conf;
+
+ return 0;
+}
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