Finished DNS-SD server. Finished Privet-specified DNS-SD server.

cloud_print/gcp20/prototype/printer.cc

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cloud_print/gcp20/prototype/printer.h"
+
+#include <ifaddrs.h>
+#include <netdb.h>
+
+#include "base/command_line.h"
+#include "base/strings/string_number_conversions.h"
+
+namespace {
+
+const char* kServiceNamePrefix = "first_privet_device";
+const char* kServiceDomainName = "my.privet.device.local";
+
+const uint16 kDefaultTTL = 60*60;
+const uint16 kDefaultHttpPort = 10101;
+
+uint16 ReadHttpPortFromCommandLine() {
+  uint32 http_port_tmp = kDefaultHttpPort;
+
+  std::string http_port_string_tmp =
+      CommandLine::ForCurrentProcess()->GetSwitchValueASCII("http-port");
+  base::StringToUint(http_port_string_tmp, &http_port_tmp);
+
+  if (http_port_tmp > kuint32max) {
+    LOG(ERROR) << "Port " << http_port_tmp << " is too large (maximum is " <<
+        kDefaultHttpPort << "). Using default port.";
+
+    http_port_tmp = kDefaultHttpPort;
+  }
+
+  VLOG(1) << "HTTP port for responses: " << http_port_tmp;
+  return static_cast<uint16>(http_port_tmp);
+}
+
+uint16 ReadTtlFromCommandLine() {
+  uint32 ttl = kDefaultTTL;
+

[Vitaly Buka (NO REVIEWS), 2013/06/14 23:46:52]

base::StringToUint(
    CommandLine::ForCurrentProcess()->GetSwitchValueASCII("ttl"),
    &ttl);

[maksymb, 2013/06/15 01:02:22]

Done.

+  std::string ttl_string_tmp =
+      CommandLine::ForCurrentProcess()->GetSwitchValueASCII("ttl");
+  base::StringToUint(ttl_string_tmp, &ttl);
+
+  VLOG(1) << "TTL for announcements: " << ttl;
+  return ttl;
+}
+
+// Returns pointer to local IP address number. Examples for interface name
+// are: "wlan0", "eth0", NULL (find first acceptable except "lo").
+net::IPAddressNumber GetLocalIp(const char* interface_name) {
+  ifaddrs* ifaddr = NULL;

[Vitaly Buka (NO REVIEWS), 2013/06/14 23:46:52]

move both this closer where it used first time

[maksymb, 2013/06/15 01:02:22]

Done.

+  char host[NI_MAXHOST] = {0};
+
+  net::IPAddressNumber result;  // |result| is empty if no interface found.
+  if (getifaddrs(&ifaddr) == -1) {

[Vitaly Buka (NO REVIEWS), 2013/06/14 23:46:52]

ifaddr -> first_address
ifa -> address

[maksymb, 2013/06/15 01:02:22]

I think "ifa" means "interface". Done.

+    LOG(ERROR) << "getifaddrs() failed";
+    return result;
+  }
+
+  // Browse all interfaces.
+  for (ifaddrs* ifa = ifaddr; ifa; ifa = ifa->ifa_next) {
+    if (!ifa->ifa_addr)
+      continue;
+
+    // Get additional info about current interface.
+    int rv = getnameinfo(ifa->ifa_addr,
+                         sizeof(*ifa->ifa_addr),
+                         host,
+                         NI_MAXHOST,
+                         NULL,
+                         0,
+                         NI_NUMERICHOST);
+
+    if (ifa->ifa_addr->sa_family == AF_INET) {
+      // Find interface we need.
+      if (interface_name ? (strcmp(ifa->ifa_name, interface_name) == 0)
+                         : (strcmp(ifa->ifa_name, "lo") != 0)) {
+        if (rv != 0) {
+          LOG(ERROR) << "getnameinfo() failed: " << gai_strerror(rv);
+          break;
+        }
+
+        net::ParseIPLiteralToNumber(host, &result);
+      }
+    }
+  }
+
+  // Erase memory under list of interfaces.
+  freeifaddrs(ifaddr);
+  return result;
+}
+
+}  // namespace
+
+Printer::Printer() : initialized_(false) {
+}
+
+Printer::~Printer() {
+  Stop();
+}
+
+bool Printer::Start() {
+  if (initialized_)
+    return true;
+
+  // TODO(maksymb): Add possibility to control interface via command line args.
+  net::IPAddressNumber ip = GetLocalIp(NULL);
+  if (ip.empty()) {
+    LOG(ERROR) << "No local IP found. Cannot start printer.";
+    return false;
+  }
+  VLOG(1) << "Local address: " << net::IPAddressToString(ip);
+
+  // Starting DNS-SD server.
+  initialized_ = dns_server_.Start(
+      new PrivetDnsResponseBuilderFactory(kServiceNamePrefix,
+                                          kServiceDomainName,
+                                          ip,
+                                          ReadHttpPortFromCommandLine()),
+      ReadTtlFromCommandLine());
+  return initialized_;
+}
+
+void Printer::Stop() {
+  if (!initialized_)
+    return;
+
+  dns_server_.Shutdown();
+}
+