- modified daemon code to support startup in case the specified network interface doesn't have an IP address. In this case the daemon waits for an IP address.

- removed not functional daemon option (-i)
- fixed exception handling in SAP::send() method

daemon/config.cpp

@@ -86,21 +86,23 @@ std::shared_ptr<Config> Config::parse(const std::string& filename) {
   config.mac_addr_ = mac_addr;
   config.mac_str_ = mac_str;
 
-  auto [ip_addr, ip_str] = get_interface_ip(config.interface_name_);
-  if (ip_str.empty()) {
-    std::cerr << "Cannot retrieve IPv4 address for interface "
-              << config.interface_name_ << std::endl;
-    return nullptr;
-  }
-  config.ip_addr_ = ip_addr;
-  config.ip_str_ = ip_str;
   auto interface_idx = get_interface_index(config.interface_name_);
   if (interface_idx < 0) {
     std::cerr << "Cannot retrieve index for interface "
               << config.interface_name_ << std::endl;
-    return nullptr;
+  } else {
+    config.interface_idx_ = interface_idx;
   }
-  config.interface_idx_ = interface_idx;
+
+  auto [ip_addr, ip_str] = get_interface_ip(config.interface_name_);
+  if (ip_str.empty()) {
+    std::cerr << "Cannot retrieve IPv4 address for interface "
+              << config.interface_name_ << std::endl;
+  } else {
+    config.ip_addr_ = ip_addr;
+    config.ip_str_ = ip_str;
+  }
+
   config.config_filename_ = filename;
   config.need_restart_ = false;
 

daemon/interface.cpp

@@ -30,7 +30,7 @@ std::pair<uint32_t, std::string> get_interface_ip(
     const std::string& interface_name) {
   int fd = socket(AF_INET, SOCK_DGRAM, 0);
   if (fd < 0) {
-    BOOST_LOG_TRIVIAL(error)
+    BOOST_LOG_TRIVIAL(warning)
         << "Cannot retrieve IP address for interface " << interface_name;
     return {0, ""};
   }
@@ -39,7 +39,7 @@ std::pair<uint32_t, std::string> get_interface_ip(
   strncpy(ifr.ifr_name, interface_name.c_str(), IFNAMSIZ - 1);
   if (ioctl(fd, SIOCGIFADDR, &ifr) < 0) {
     close(fd);
-    BOOST_LOG_TRIVIAL(error)
+    BOOST_LOG_TRIVIAL(warning)
         << "Cannot retrieve IP address for interface " << interface_name;
     return {0, ""};
   }
@@ -91,7 +91,7 @@ std::pair<std::array<uint8_t, 6>, std::string> get_interface_mac(
 int get_interface_index(const std::string& interface_name) {
   int fd = socket(AF_INET, SOCK_DGRAM, 0);
   if (fd < 0) {
-    BOOST_LOG_TRIVIAL(error)
+    BOOST_LOG_TRIVIAL(warning)
         << "Cannot retrieve index for interface " << interface_name;
     return -1;
   }
@@ -100,7 +100,7 @@ int get_interface_index(const std::string& interface_name) {
   strncpy(ifr.ifr_name, interface_name.c_str(), IFNAMSIZ - 1);
   if (ioctl(fd, SIOCGIFADDR, &ifr) < 0) {
     close(fd);
-    BOOST_LOG_TRIVIAL(error)
+    BOOST_LOG_TRIVIAL(warning)
         << "Cannot retrieve index for interface " << interface_name;
     return -1;
   }

daemon/main.cpp

@@ -52,9 +52,8 @@ int main(int argc, char* argv[]) {
   po::options_description desc("Options");
   desc.add_options()(
       "config,c", po::value<std::string>()->default_value("/etc/daemon.conf"),
-      "daemon configuration file")("interface_name,i", po::value<std::string>(),
-                                   "Network interface name")(
-      "http_port,p", po::value<int>(), "HTTP server port")(
+      "daemon configuration file")("http_port,p", po::value<int>(),
+                                   "HTTP server port")(
       "help,h", "Print this help message");
   int unix_style = postyle::unix_style | postyle::short_allow_next;
 
@@ -94,15 +93,18 @@ int main(int argc, char* argv[]) {
       return EXIT_FAILURE;
     }
     /* override configuration according to command line args */
-    if (vm.count("interface_name")) {
-      config->set_interface_name(vm["interface_name"].as<std::string>());
-    }
     if (vm.count("http_port")) {
       config->set_http_port(vm["http_port"].as<int>());
     }
     /* init logging */
     log_init(*config);
 
+    if (config->get_ip_addr_str().empty()) {
+      BOOST_LOG_TRIVIAL(info) << "main:: no IP address, waiting ...";
+      std::this_thread::sleep_for(std::chrono::seconds(1));
+      continue;
+    }
+
     BOOST_LOG_TRIVIAL(debug) << "main:: initializing daemon";
     try {
       auto driver = DriverManager::create();
@@ -147,11 +149,9 @@ int main(int argc, char* argv[]) {
       BOOST_LOG_TRIVIAL(debug) << "main:: init done, entering loop...";
       while (!is_terminated()) {
         auto [ip_addr, ip_str] = get_interface_ip(config->get_interface_name());
-        if (!ip_str.empty() && config->get_ip_addr_str() != ip_str) {
+        if (config->get_ip_addr_str() != ip_str) {
           BOOST_LOG_TRIVIAL(warning)
               << "main:: IP address changed, restarting ...";
-          config->set_ip_addr_str(ip_str);
-          config->set_ip_addr(ip_addr);
           break;
         }
 

daemon/sap.cpp

@@ -149,8 +149,8 @@ bool SAP::send(bool is_announce,
   try {
     socket_.send_to(boost::asio::buffer(buffer, sap_header_len + sdp.length()),
                     remote_endpoint_);
-  } catch (boost::system::error_code& ec) {
-    BOOST_LOG_TRIVIAL(error) << "sap::send_to " << ec.message();
+  } catch (...) {
+    BOOST_LOG_TRIVIAL(error) << "sap::send_to failed";
     return false;
   }
   return true;