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Diffstat (limited to 'src/null_mechanism.cpp')
-rw-r--r-- | src/null_mechanism.cpp | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/src/null_mechanism.cpp b/src/null_mechanism.cpp new file mode 100644 index 0000000..f4ea9e7 --- /dev/null +++ b/src/null_mechanism.cpp @@ -0,0 +1,282 @@ +/* + 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 "platform.hpp" +#ifdef ZMQ_HAVE_WINDOWS +#include "windows.hpp" +#endif + +#include <stddef.h> +#include <string.h> +#include <stdlib.h> + +#include "err.hpp" +#include "msg.hpp" +#include "session_base.hpp" +#include "wire.hpp" +#include "null_mechanism.hpp" + +zmq::null_mechanism_t::null_mechanism_t (session_base_t *session_, + const std::string &peer_address_, + const options_t &options_) : + mechanism_t (options_), + session (session_), + peer_address (peer_address_), + ready_command_sent (false), + ready_command_received (false), + zap_connected (false), + zap_request_sent (false), + zap_reply_received (false) +{ + // NULL mechanism only uses ZAP if there's a domain defined + // This prevents ZAP requests on naive sockets + if (options.zap_domain.size () > 0 + && session->zap_connect () == 0) + zap_connected = true; +} + +zmq::null_mechanism_t::~null_mechanism_t () +{ +} + +int zmq::null_mechanism_t::next_handshake_command (msg_t *msg_) +{ + if (ready_command_sent) { + errno = EAGAIN; + return -1; + } + if (zap_connected && !zap_reply_received) { + if (zap_request_sent) { + errno = EAGAIN; + return -1; + } + send_zap_request (); + zap_request_sent = true; + const int rc = receive_and_process_zap_reply (); + if (rc != 0) + return -1; + zap_reply_received = true; + } + + unsigned char * const command_buffer = (unsigned char *) malloc (512); + alloc_assert (command_buffer); + + unsigned char *ptr = command_buffer; + + // Add mechanism string + memcpy (ptr, "\5READY", 6); + ptr += 6; + + // Add socket type property + const char *socket_type = socket_type_string (options.type); + ptr += add_property (ptr, "Socket-Type", socket_type, strlen (socket_type)); + + // Add identity property + if (options.type == ZMQ_REQ + || options.type == ZMQ_DEALER + || options.type == ZMQ_ROUTER) { + ptr += add_property (ptr, "Identity", + options.identity, options.identity_size); + } + + const size_t command_size = ptr - command_buffer; + const int rc = msg_->init_size (command_size); + errno_assert (rc == 0); + memcpy (msg_->data (), command_buffer, command_size); + free (command_buffer); + + ready_command_sent = true; + + return 0; +} + +int zmq::null_mechanism_t::process_handshake_command (msg_t *msg_) +{ + if (ready_command_received) { + errno = EPROTO; + return -1; + } + + const unsigned char *ptr = + static_cast <unsigned char *> (msg_->data ()); + size_t bytes_left = msg_->size (); + + if (bytes_left < 6 || memcmp (ptr, "\5READY", 6)) { + errno = EPROTO; + return -1; + } + + ptr += 6; + bytes_left -= 6; + + int rc = parse_metadata (ptr, bytes_left); + if (rc == 0) { + int rc = msg_->close (); + errno_assert (rc == 0); + rc = msg_->init (); + errno_assert (rc == 0); + } + + ready_command_received = true; + + return rc; +} + +int zmq::null_mechanism_t::zap_msg_available () +{ + if (zap_reply_received) { + errno = EFSM; + return -1; + } + const int rc = receive_and_process_zap_reply (); + if (rc == 0) + zap_reply_received = true; + return rc; +} + +bool zmq::null_mechanism_t::is_handshake_complete () const +{ + return ready_command_received && ready_command_sent; +} + +void zmq::null_mechanism_t::send_zap_request () +{ + int rc; + msg_t msg; + + // Address delimiter frame + rc = msg.init (); + errno_assert (rc == 0); + msg.set_flags (msg_t::more); + rc = session->write_zap_msg (&msg); + errno_assert (rc == 0); + + // Version frame + rc = msg.init_size (3); + errno_assert (rc == 0); + memcpy (msg.data (), "1.0", 3); + msg.set_flags (msg_t::more); + rc = session->write_zap_msg (&msg); + errno_assert (rc == 0); + + // Request id frame + rc = msg.init_size (1); + errno_assert (rc == 0); + memcpy (msg.data (), "1", 1); + msg.set_flags (msg_t::more); + rc = session->write_zap_msg (&msg); + errno_assert (rc == 0); + + // Domain frame + rc = msg.init_size (options.zap_domain.length ()); + errno_assert (rc == 0); + memcpy (msg.data (), options.zap_domain.c_str (), options.zap_domain.length ()); + msg.set_flags (msg_t::more); + rc = session->write_zap_msg (&msg); + errno_assert (rc == 0); + + // Address frame + rc = msg.init_size (peer_address.length ()); + errno_assert (rc == 0); + memcpy (msg.data (), peer_address.c_str (), peer_address.length ()); + msg.set_flags (msg_t::more); + rc = session->write_zap_msg (&msg); + errno_assert (rc == 0); + + // Identity frame + rc = msg.init_size (options.identity_size); + errno_assert (rc == 0); + memcpy (msg.data (), options.identity, options.identity_size); + msg.set_flags (msg_t::more); + rc = session->write_zap_msg (&msg); + errno_assert (rc == 0); + + // Mechanism frame + rc = msg.init_size (4); + errno_assert (rc == 0); + memcpy (msg.data (), "NULL", 4); + rc = session->write_zap_msg (&msg); + errno_assert (rc == 0); +} + +int zmq::null_mechanism_t::receive_and_process_zap_reply () +{ + int rc = 0; + msg_t msg [7]; // ZAP reply consists of 7 frames + + // Initialize all reply frames + for (int i = 0; i < 7; i++) { + rc = msg [i].init (); + errno_assert (rc == 0); + } + + for (int i = 0; i < 7; i++) { + rc = session->read_zap_msg (&msg [i]); + if (rc == -1) + break; + if ((msg [i].flags () & msg_t::more) == (i < 6? 0: msg_t::more)) { + errno = EPROTO; + rc = -1; + break; + } + } + + if (rc != 0) + goto error; + + // Address delimiter frame + if (msg [0].size () > 0) { + rc = -1; + errno = EPROTO; + goto error; + } + + // Version frame + if (msg [1].size () != 3 || memcmp (msg [1].data (), "1.0", 3)) { + rc = -1; + errno = EPROTO; + goto error; + } + + // Request id frame + if (msg [2].size () != 1 || memcmp (msg [2].data (), "1", 1)) { + rc = -1; + errno = EPROTO; + goto error; + } + + // Status code frame + if (msg [3].size () != 3 || memcmp (msg [3].data (), "200", 3)) { + rc = -1; + errno = EACCES; + goto error; + } + + // Process metadata frame + rc = parse_metadata (static_cast <const unsigned char*> (msg [6].data ()), + msg [6].size ()); + +error: + for (int i = 0; i < 7; i++) { + const int rc2 = msg [i].close (); + errno_assert (rc2 == 0); + } + + return rc; +} |