1/*
2 Copyright (c) 2007-2019 Contributors as noted in the AUTHORS file
3
4 This file is part of libzmq, the ZeroMQ core engine in C++.
5
6 libzmq is free software; you can redistribute it and/or modify it under
7 the terms of the GNU Lesser General Public License (LGPL) as published
8 by the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 As a special exception, the Contributors give you permission to link
12 this library with independent modules to produce an executable,
13 regardless of the license terms of these independent modules, and to
14 copy and distribute the resulting executable under terms of your choice,
15 provided that you also meet, for each linked independent module, the
16 terms and conditions of the license of that module. An independent
17 module is a module which is not derived from or based on this library.
18 If you modify this library, you must extend this exception to your
19 version of the library.
20
21 libzmq is distributed in the hope that it will be useful, but WITHOUT
22 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
23 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
24 License for more details.
25
26 You should have received a copy of the GNU Lesser General Public License
27 along with this program. If not, see <http://www.gnu.org/licenses/>.
28*/
29
30#include "precompiled.hpp"
31#include "ws_protocol.hpp"
32#include "ws_encoder.hpp"
33#include "msg.hpp"
34#include "likely.hpp"
35#include "wire.hpp"
36#include "random.hpp"
37
38#include <limits.h>
39
40zmq::ws_encoder_t::ws_encoder_t (size_t bufsize_, bool must_mask_) :
41 encoder_base_t<ws_encoder_t> (bufsize_),
42 _must_mask (must_mask_)
43{
44 // Write 0 bytes to the batch and go to message_ready state.
45 next_step (NULL, 0, &ws_encoder_t::message_ready, true);
46 _masked_msg.init ();
47}
48
49zmq::ws_encoder_t::~ws_encoder_t ()
50{
51 _masked_msg.close ();
52}
53
54void zmq::ws_encoder_t::message_ready ()
55{
56 int offset = 0;
57
58 // TODO: it might be close/ping/pong, which should be different op code
59 _tmp_buf[offset++] = 0x82; // Final | binary
60 _tmp_buf[offset] = _must_mask ? 0x80 : 0x00;
61
62 size_t size = in_progress ()->size ();
63 size++; // TODO: check if binary
64
65 if (size <= 125)
66 _tmp_buf[offset++] |= static_cast<unsigned char> (size & 127);
67 else if (size <= 0xFFFF) {
68 _tmp_buf[offset++] |= 126;
69 _tmp_buf[offset++] = static_cast<unsigned char> ((size >> 8) & 0xFF);
70 _tmp_buf[offset++] = static_cast<unsigned char> (size & 0xFF);
71 } else {
72 _tmp_buf[offset++] |= 127;
73 put_uint64 (_tmp_buf + offset, size);
74 offset += 8;
75 }
76
77 if (_must_mask) {
78 uint32_t random = generate_random ();
79 put_uint32 (_tmp_buf + offset, random);
80 put_uint32 (_mask, random);
81 offset += 4;
82 }
83
84 // TODO: check if binary
85
86 // Encode flags.
87 unsigned char protocol_flags = 0;
88 if (in_progress ()->flags () & msg_t::more)
89 protocol_flags |= ws_protocol_t::more_flag;
90 if (in_progress ()->flags () & msg_t::command)
91 protocol_flags |= ws_protocol_t::command_flag;
92
93 _tmp_buf[offset++] =
94 _must_mask ? protocol_flags ^ _mask[0] : protocol_flags;
95
96 next_step (_tmp_buf, offset, &ws_encoder_t::size_ready, false);
97}
98
99void zmq::ws_encoder_t::size_ready ()
100{
101 if (_must_mask) {
102 assert (in_progress () != &_masked_msg);
103 size_t size = in_progress ()->size ();
104
105 _masked_msg.close ();
106 _masked_msg.init_size (size);
107
108 int mask_index = 1; // TODO: check if binary message
109 unsigned char *dest =
110 static_cast<unsigned char *> (_masked_msg.data ());
111 unsigned char *src =
112 static_cast<unsigned char *> (in_progress ()->data ());
113 for (size_t i = 0; i < in_progress ()->size (); ++i, mask_index++)
114 dest[i] = src[i] ^ _mask[mask_index % 4];
115
116 next_step (_masked_msg.data (), _masked_msg.size (),
117 &ws_encoder_t::message_ready, true);
118 } else {
119 next_step (in_progress ()->data (), in_progress ()->size (),
120 &ws_encoder_t::message_ready, true);
121 }
122}
123