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/*
Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include "mechanism.hpp"
#include "options.hpp"
#include "msg.hpp"
#include "err.hpp"
#include "wire.hpp"
zmq::mechanism_t::mechanism_t (const options_t &options_) :
options (options_)
{
}
zmq::mechanism_t::~mechanism_t ()
{
}
void zmq::mechanism_t::set_peer_identity (const void *id_ptr, size_t id_size)
{
identity = blob_t (static_cast <const unsigned char*> (id_ptr), id_size);
}
void zmq::mechanism_t::peer_identity (msg_t *msg_)
{
const int rc = msg_->init_size (identity.size ());
errno_assert (rc == 0);
memcpy (msg_->data (), identity.data (), identity.size ());
msg_->set_flags (msg_t::identity);
}
const char *zmq::mechanism_t::socket_type_string (int socket_type) const
{
static const char *names [] = {"PAIR", "PUB", "SUB", "REQ", "REP",
"DEALER", "ROUTER", "PULL", "PUSH",
"XPUB", "XSUB", "STREAM"};
zmq_assert (socket_type >= 0 && socket_type <= 10);
return names [socket_type];
}
size_t zmq::mechanism_t::add_property (unsigned char *ptr, const char *name,
const void *value, size_t value_len) const
{
const size_t name_len = strlen (name);
zmq_assert (name_len <= 255);
*ptr++ = static_cast <unsigned char> (name_len);
memcpy (ptr, name, name_len);
ptr += name_len;
zmq_assert (value_len <= 0x7FFFFFFF);
put_uint32 (ptr, static_cast <uint32_t> (value_len));
ptr += 4;
memcpy (ptr, value, value_len);
return 1 + name_len + 4 + value_len;
}
int zmq::mechanism_t::parse_metadata (const unsigned char *ptr_,
size_t length_)
{
size_t bytes_left = length_;
while (bytes_left > 1) {
const size_t name_length = static_cast <size_t> (*ptr_);
ptr_ += 1;
bytes_left -= 1;
if (bytes_left < name_length)
break;
const std::string name = std::string ((char *) ptr_, name_length);
ptr_ += name_length;
bytes_left -= name_length;
if (bytes_left < 4)
break;
const size_t value_length = static_cast <size_t> (get_uint32 (ptr_));
ptr_ += 4;
bytes_left -= 4;
if (bytes_left < value_length)
break;
const uint8_t *value = ptr_;
ptr_ += value_length;
bytes_left -= value_length;
if (name == "Identity" && options.recv_identity)
set_peer_identity (value, value_length);
else
if (name == "Socket-Type") {
const std::string socket_type ((char *) value, value_length);
if (!check_socket_type (socket_type)) {
errno = EINVAL;
return -1;
}
}
else {
const int rc = property (name, value, value_length);
if (rc == -1)
return -1;
}
}
if (bytes_left > 0) {
errno = EPROTO;
return -1;
}
return 0;
}
int zmq::mechanism_t::property (const std::string name_,
const void *value_, size_t length_)
{
// Default implementation does not check
// property values and returns 0 to signal success.
return 0;
}
bool zmq::mechanism_t::check_socket_type (const std::string type_) const
{
switch (options.type) {
case ZMQ_REQ:
return type_ == "REP" || type_ == "ROUTER";
case ZMQ_REP:
return type_ == "REQ" || type_ == "DEALER";
case ZMQ_DEALER:
return type_ == "REP" || type_ == "DEALER" || type_ == "ROUTER";
case ZMQ_ROUTER:
return type_ == "REQ" || type_ == "DEALER" || type_ == "ROUTER";
case ZMQ_PUSH:
return type_ == "PULL";
case ZMQ_PULL:
return type_ == "PUSH";
case ZMQ_PUB:
return type_ == "SUB" || type_ == "XSUB";
case ZMQ_SUB:
return type_ == "PUB" || type_ == "XPUB";
case ZMQ_XPUB:
return type_ == "SUB" || type_ == "XSUB";
case ZMQ_XSUB:
return type_ == "PUB" || type_ == "XPUB";
case ZMQ_PAIR:
return type_ == "PAIR";
default:
break;
}
return false;
}
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