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

cloud_print/gcp20/prototype/printer.cc

Index: cloud_print/gcp20/prototype/printer.cc
diff --git a/cloud_print/gcp20/prototype/printer.cc b/cloud_print/gcp20/prototype/printer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2f508174660234636f7b499dc59575167eb8ba28
--- /dev/null
+++ b/cloud_print/gcp20/prototype/printer.cc
@@ -0,0 +1,131 @@
+// 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;

[Vitaly Buka (NO REVIEWS), 2013/06/14 19:27:07]

always initialize variables if it has not default constructors

[maksymb, 2013/06/14 22:17:14]

Done.

+  if (!base::StringToUint(CommandLine::ForCurrentProcess()->
+                          GetSwitchValueASCII("http-port"), &http_port_tmp))

[Vitaly Buka (NO REVIEWS), 2013/06/14 19:27:07]

use temp variable for 
CommandLine::ForCurrentProcess()->GetSwitchValueASCII("http-port")
to fix this strange line break

[maksymb, 2013/06/14 22:17:14]

Done.

+    http_port_tmp = kDefaultHttpPort;

[Vitaly Buka (NO REVIEWS), 2013/06/14 19:27:07]

If you can't fit "if"  in one line please use {} for body

[maksymb, 2013/06/14 22:17:14]

Done.

+
+  if (http_port_tmp > kuint32max) {
+    LOG(ERROR) << "Port " << http_port_tmp << " is too large (maximum is " <<
+        kDefaultHttpPort << "). Using default port.";
+    http_port_tmp = kDefaultHttpPort;
+  }
+
+  uint16 http_port = static_cast<uint16>(http_port_tmp);
+  VLOG(1) << "HTTP port for responses: " << http_port;

[Vitaly Buka (NO REVIEWS), 2013/06/14 19:27:07]

you can do that without http_port variable

[maksymb, 2013/06/14 22:17:14]

Done.

+  return http_port;
+}
+
+uint16 ReadTtlFromCommandLine() {
+  uint32 ttl;

[Vitaly Buka (NO REVIEWS), 2013/06/14 19:27:07]

initialize

[maksymb, 2013/06/14 22:17:14]

Done.

+  if (!base::StringToUint(CommandLine::ForCurrentProcess()->
+                          GetSwitchValueASCII("ttl"), &ttl))

[Vitaly Buka (NO REVIEWS), 2013/06/14 19:27:07]

same

[maksymb, 2013/06/14 22:17:14]

Done.

+    ttl = kDefaultTTL;

[Vitaly Buka (NO REVIEWS), 2013/06/14 19:27:07]

same for {}

[maksymb, 2013/06/14 22:17:14]

Done.

+
+  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) {

[Vitaly Buka (NO REVIEWS), 2013/06/14 19:27:07]

Header fits one line

[maksymb, 2013/06/14 22:17:14]

Done.

+  struct ifaddrs *ifaddr;

[Vitaly Buka (NO REVIEWS), 2013/06/14 19:27:07]

uninitialized pointer and datastructor

char host[NI_MAXHOST] = {0}

[maksymb, 2013/06/14 22:17:14]

Done.

+  char host[NI_MAXHOST];
+
+  net::IPAddressNumber result;  // |result| is empty if no interface found.
+  if (getifaddrs(&ifaddr) == -1) {
+    LOG(ERROR) << "getifaddrs() failed";
+    return result;
+  }
+
+  // Browse all interfaces.
+  for (struct ifaddrs* ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {

[Vitaly Buka (NO REVIEWS), 2013/06/14 19:27:07]

don't need struct here

[Vitaly Buka (NO REVIEWS), 2013/06/14 19:27:07]

ifa != NULL  -> ifa

[maksymb, 2013/06/14 22:17:14]

Done.

[maksymb, 2013/06/14 22:17:14]

Done.

+    if (ifa->ifa_addr == NULL)
+      continue;
+
+    // Get additional info about current interface.
+    int rv = getnameinfo(ifa->ifa_addr,

[Vitaly Buka (NO REVIEWS), 2013/06/14 19:27:07]

missaligned

[maksymb, 2013/06/14 22:17:14]

Done.

+                    sizeof(struct sockaddr_in),

[Vitaly Buka (NO REVIEWS), 2013/06/14 19:27:07]

sizeof(*ifa->ifa_addr)

[maksymb, 2013/06/14 22:17:14]

Done.

+                    host,
+                    NI_MAXHOST,
+                    NULL,
+                    0,
+                    NI_NUMERICHOST);
+
+    if (ifa->ifa_addr->sa_family == AF_INET) {
+      // Find interface we need.
+      if (interface_name == NULL ? strcmp(ifa->ifa_name, "lo") != 0
+                                 : strcmp(ifa->ifa_name, interface_name) == 0) {

[Vitaly Buka (NO REVIEWS), 2013/06/14 19:27:07]

just "interface_name ? "

and add () in ? (...) : (...)

[maksymb, 2013/06/14 22:17:14]

Done.

+        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(2) << "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();
+}
+