| // Copyright (c) 2011 The Chromium OS 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 "shill/dhcp_config.h" |
| |
| #include <arpa/inet.h> |
| |
| #include <base/logging.h> |
| #include <glib.h> |
| |
| #include "shill/dhcpcd_proxy.h" |
| #include "shill/dhcp_provider.h" |
| |
| using std::string; |
| using std::vector; |
| |
| namespace shill { |
| |
| const char DHCPConfig::kConfigurationKeyBroadcastAddress[] = "BroadcastAddress"; |
| const char DHCPConfig::kConfigurationKeyDNS[] = "DomainNameServers"; |
| const char DHCPConfig::kConfigurationKeyDomainName[] = "DomainName"; |
| const char DHCPConfig::kConfigurationKeyDomainSearch[] = "DomainSearch"; |
| const char DHCPConfig::kConfigurationKeyIPAddress[] = "IPAddress"; |
| const char DHCPConfig::kConfigurationKeyMTU[] = "InterfaceMTU"; |
| const char DHCPConfig::kConfigurationKeyRouters[] = "Routers"; |
| const char DHCPConfig::kConfigurationKeySubnetCIDR[] = "SubnetCIDR"; |
| const char DHCPConfig::kDHCPCDPath[] = "/sbin/dhcpcd"; |
| |
| |
| DHCPConfig::DHCPConfig(DHCPProvider *provider, DeviceConstRefPtr device) |
| : IPConfig(device), |
| provider_(provider), |
| pid_(0) { |
| VLOG(2) << __func__ << ": " << GetDeviceName(); |
| } |
| |
| DHCPConfig::~DHCPConfig() { |
| VLOG(2) << __func__ << ": " << GetDeviceName(); |
| } |
| |
| bool DHCPConfig::Request() { |
| VLOG(2) << __func__ << ": " << GetDeviceName(); |
| if (!pid_) { |
| return Start(); |
| } |
| if (!proxy_.get()) { |
| LOG(ERROR) |
| << "Unable to acquire destination address before receiving request."; |
| return false; |
| } |
| return Renew(); |
| } |
| |
| bool DHCPConfig::Renew() { |
| VLOG(2) << __func__ << ": " << GetDeviceName(); |
| if (!pid_ || !proxy_.get()) { |
| return false; |
| } |
| proxy_->DoRebind(GetDeviceName()); |
| return true; |
| } |
| |
| void DHCPConfig::InitProxy(DBus::Connection *connection, const char *service) { |
| if (!proxy_.get()) { |
| proxy_.reset(new DHCPCDProxy(connection, service)); |
| } |
| } |
| |
| void DHCPConfig::ProcessEventSignal(const std::string &reason, |
| const Configuration &configuration) { |
| LOG(INFO) << "Event reason: " << reason; |
| |
| IPConfig::Properties properties; |
| if (!ParseConfiguration(configuration, &properties)) { |
| LOG(ERROR) << "Unable to parse the new DHCP configuration -- ignored."; |
| return; |
| } |
| UpdateProperties(properties); |
| } |
| |
| bool DHCPConfig::Start() { |
| VLOG(2) << __func__ << ": " << GetDeviceName(); |
| |
| char *argv[4], *envp[1]; |
| argv[0] = const_cast<char *>(kDHCPCDPath); |
| argv[1] = const_cast<char *>("-B"); // foreground |
| argv[2] = const_cast<char *>(GetDeviceName().c_str()); |
| argv[3] = NULL; |
| |
| envp[0] = NULL; |
| |
| GPid pid = 0; |
| if (!g_spawn_async(NULL, |
| argv, |
| envp, |
| G_SPAWN_DO_NOT_REAP_CHILD, |
| NULL, |
| NULL, |
| &pid, |
| NULL)) { |
| LOG(ERROR) << "Unable to spawn " << kDHCPCDPath; |
| return false; |
| } |
| pid_ = pid; |
| LOG(INFO) << "Spawned " << kDHCPCDPath << " with pid: " << pid_; |
| provider_->BindPID(pid_, DHCPConfigRefPtr(this)); |
| // TODO(petkov): Add an exit watch to cleanup w/ g_spawn_close_pid. |
| return true; |
| } |
| |
| string DHCPConfig::GetIPv4AddressString(unsigned int address) { |
| char str[INET_ADDRSTRLEN]; |
| if (inet_ntop(AF_INET, &address, str, arraysize(str))) { |
| return str; |
| } |
| LOG(ERROR) << "Unable to convert IPv4 address to string: " << address; |
| return ""; |
| } |
| |
| bool DHCPConfig::ParseConfiguration(const Configuration& configuration, |
| IPConfig::Properties *properties) { |
| VLOG(2) << __func__; |
| for (Configuration::const_iterator it = configuration.begin(); |
| it != configuration.end(); ++it) { |
| const string &key = it->first; |
| const DBus::Variant &value = it->second; |
| VLOG(2) << "Processing key: " << key; |
| if (key == kConfigurationKeyIPAddress) { |
| properties->address = GetIPv4AddressString(value.reader().get_uint32()); |
| if (properties->address.empty()) { |
| return false; |
| } |
| } else if (key == kConfigurationKeySubnetCIDR) { |
| properties->subnet_cidr = value.reader().get_byte(); |
| } else if (key == kConfigurationKeyBroadcastAddress) { |
| properties->broadcast_address = |
| GetIPv4AddressString(value.reader().get_uint32()); |
| if (properties->broadcast_address.empty()) { |
| return false; |
| } |
| } else if (key == kConfigurationKeyRouters) { |
| vector<unsigned int> routers; |
| DBus::MessageIter reader = value.reader(); |
| reader >> routers; |
| if (routers.empty()) { |
| LOG(ERROR) << "No routers provided."; |
| return false; |
| } |
| properties->gateway = GetIPv4AddressString(routers[0]); |
| if (properties->gateway.empty()) { |
| return false; |
| } |
| } else if (key == kConfigurationKeyDNS) { |
| vector<unsigned int> servers; |
| DBus::MessageIter reader = value.reader(); |
| reader >> servers; |
| vector<string> dns_servers; |
| for (vector<unsigned int>::const_iterator it = servers.begin(); |
| it != servers.end(); ++it) { |
| string server = GetIPv4AddressString(*it); |
| if (server.empty()) { |
| return false; |
| } |
| properties->dns_servers.push_back(server); |
| } |
| } else if (key == kConfigurationKeyDomainName) { |
| properties->domain_name = value.reader().get_string(); |
| } else if (key == kConfigurationKeyDomainSearch) { |
| DBus::MessageIter reader = value.reader(); |
| reader >> properties->domain_search; |
| } else if (key == kConfigurationKeyMTU) { |
| int mtu = value.reader().get_uint16(); |
| if (mtu >= 576) { |
| properties->mtu = mtu; |
| } |
| } else { |
| VLOG(2) << "Key ignored."; |
| } |
| } |
| return true; |
| } |
| |
| } // namespace shill |