/// Create an iterator from an addrinfo list returned by getaddrinfo.
static basic_resolver_iterator create(
asio::detail::addrinfo_type* address_info,
const std::string& host_name, const std::string& service_name)
{
basic_resolver_iterator iter;
if (!address_info)
return iter;
std::string actual_host_name = host_name;
if (address_info->ai_canonname)
actual_host_name = address_info->ai_canonname;
iter.values_.reset(new values_type);
while (address_info)
{
if (address_info->ai_family == ASIO_OS_DEF(AF_INET)
|| address_info->ai_family == ASIO_OS_DEF(AF_INET6))
{
using namespace std; // For memcpy.
typename InternetProtocol::endpoint endpoint;
endpoint.resize(static_cast<std::size_t>(address_info->ai_addrlen));
memcpy(endpoint.data(), address_info->ai_addr,
address_info->ai_addrlen);
iter.values_->push_back(
basic_resolver_entry<InternetProtocol>(endpoint,
actual_host_name, service_name));
}
address_info = address_info->ai_next;
}
return iter;
}
/**
* This constructor is typically used to perform name resolution for local
* service binding.
*
* @param service_name A string identifying the requested service. This may
* be a descriptive name or a numeric string corresponding to a port number.
*
* @param resolve_flags A set of flags that determine how name resolution
* should be performed. The default flags are suitable for local service
* binding.
*
* @note On POSIX systems, service names are typically defined in the file
* <tt>/etc/services</tt>. On Windows, service names may be found in the file
* <tt>c:\\windows\\system32\\drivers\\etc\\services</tt>. Operating systems
* may use additional locations when resolving service names.
*/
basic_resolver_query(const std::string& service_name,
resolver_query_base::flags resolve_flags = passive | address_configured)
: hints_(),
host_name_(),
service_name_(service_name)
{
typename InternetProtocol::endpoint endpoint;
hints_.ai_flags = static_cast<int>(resolve_flags);
hints_.ai_family = PF_UNSPEC;
hints_.ai_socktype = endpoint.protocol().type();
hints_.ai_protocol = endpoint.protocol().protocol();
hints_.ai_addrlen = 0;
hints_.ai_canonname = 0;
hints_.ai_addr = 0;
hints_.ai_next = 0;
}
/// Construct with specified host name and service name for any protocol.
basic_resolver_query(const std::string& host_name,
const std::string& service_name, int flags = address_configured)
: hints_(),
host_name_(host_name),
service_name_(service_name)
{
typename InternetProtocol::endpoint endpoint;
hints_.ai_flags = flags;
hints_.ai_family = PF_UNSPEC;
hints_.ai_socktype = endpoint.protocol().type();
hints_.ai_protocol = endpoint.protocol().protocol();
hints_.ai_addrlen = 0;
hints_.ai_canonname = 0;
hints_.ai_addr = 0;
hints_.ai_next = 0;
}