aboutsummaryrefslogtreecommitdiff
path: root/rfc4251.H
blob: 7284f20009e00ed338be7fb895b19c10797e64fc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
/*
 * rfc4251.h -- implements types from RFC 4251, section 5
 *
 * rfc4251::byte	byte
 * rfc4251::boolean	boolean
 * rfc4251::uint32	uint32
 * rfc4251::uint64	uint64
 * rfc4251::string	string, incl. mpint and name-list
 *
 * those structs contain the objects in their RFC 4251 representation,
 * conversions are provided via constructors and cast operators
 *
 * Copyright (C) 2013-2014 Timo Weingärtner <timo@tiwe.de>
 *
 * This file is part of ssh-agent-filter.
 *
 * ssh-agent-filter is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * ssh-agent-filter 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ssh-agent-filter.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <vector>
#include <string>
#include <iostream>
#include <limits>
#include <stdexcept>
#include <arpa/inet.h>	// ntohl() / htonl()
#include <gmpxx.h>
#include <boost/operators.hpp>

namespace rfc4251 {

struct byte {
	union {
		uint8_t value;
		char buf[1];
	};

	byte () = default;
	explicit byte (uint8_t v) : value(v) {}
	inline explicit byte (std::istream &);

	operator uint8_t () const { return value; }
};

inline std::istream & operator>> (std::istream & is, byte & x) {
	return is.read(x.buf, sizeof(x.buf));
}

inline std::ostream & operator<< (std::ostream & os, byte const & x) {
	return os.write(x.buf, sizeof(x.buf));
}

inline byte::byte (std::istream & is) {
	is >> *this;
}

struct boolean {
	union {
		bool value;
		char buf[1];
	};

	boolean () = default;
	explicit boolean (uint8_t v) : value(v) {}
	inline explicit boolean (std::istream &);

	operator uint8_t () const { return value; }
};

inline std::istream & operator>> (std::istream & is, boolean & x) {
	return is.read(x.buf, sizeof(x.buf));
}

inline std::ostream & operator<< (std::ostream & os, boolean const & x) {
	return os.write(x.buf, sizeof(x.buf));
}

inline boolean::boolean (std::istream & is) {
	is >> *this;
}

struct uint32 {
	union {
		uint32_t value;
		char buf[4];
	};

	uint32 () = default;
	explicit uint32 (uint32_t v) { value = htonl(v); }
	inline explicit uint32 (std::istream &);

	operator uint32_t () const { return ntohl(value); }
};

inline std::istream & operator>> (std::istream & is, uint32 & x) {
	return is.read(x.buf, sizeof(x.buf));
}

inline std::ostream & operator<< (std::ostream & os, uint32 const & x) {
	return os.write(x.buf, sizeof(x.buf));
}

inline uint32::uint32 (std::istream & is) {
	is >> *this;
}

struct uint64 {
	union {
		uint64_t value;
		char buf[8];
	};

	uint64 () = default;
	inline explicit uint64 (uint64_t v);
	inline explicit uint64 (std::istream &);

	inline explicit operator uint64_t () const;
};

inline uint64::uint64 (uint64_t v) {
	for (int_fast8_t i{7}; i >= 0; --i) {
		buf[i] = v & 0xff;
		v >>= 8;
	}
}

inline uint64::operator uint64_t () const {
	uint64_t ret{0};
	for (uint_fast8_t i{0}; i < 8; ++i) {
		ret <<= 8;
		ret |= static_cast<uint8_t>(buf[i]);
	}
	return ret;
}

inline std::istream & operator>> (std::istream & is, uint64 & x) {
	return is.read(x.buf, sizeof(x.buf));
}

inline std::ostream & operator<< (std::ostream & os, uint64 const & x) {
	return os.write(x.buf, sizeof(x.buf));
}

inline uint64::uint64 (std::istream & is) {
	is >> *this;
}

struct string : boost::totally_ordered<string> {
	std::vector<char> value;
	
	string () = default;
	inline explicit string (char const *, size_t);
	explicit string (std::string const & s) : string{s.data(), s.size()} {}
	explicit string (std::vector<std::string> const &);
	explicit string (mpz_srcptr);
	explicit string (mpz_class const & x) : string{x.get_mpz_t()} {}
	inline explicit string (std::istream &);

	size_t size () const { return value.size(); }
	char const * data () const { return value.data(); }
	char * data () { return value.data(); }

	operator std::string () const { return {value.begin(), value.end()}; }
	operator std::vector<std::string> () const;
	operator mpz_class () const;
};

inline string::string (char const * s, size_t l) {
	if (l > std::numeric_limits<uint32_t>::max())
		throw std::length_error{"32-bit limit for rfc4251::string exceeded"};
	value.insert(value.end(), s, s + l);
}

inline std::istream & operator>> (std::istream & is, string & s) {
	s.value.clear();
	uint32 len;
	if (is >> len) {
		s.value.resize(len);
		is.read(s.value.data(), len);
	}
	return is;
}

inline std::ostream & operator<< (std::ostream & os, string const & s) {
	if (s.value.size() > std::numeric_limits<uint32_t>::max())
		throw std::length_error{"32-bit limit for rfc4251::string exceeded"};
	if (os << uint32{static_cast<uint32_t>(s.value.size())})
		os.write(s.value.data(), s.value.size());
	return os;
}

inline string::string (std::istream & is) {
	is >> *this;
}

inline bool operator== (string const & l, string const & r) {
	return l.value == r.value;
}

inline bool operator< (string const & l, string const & r) {
	return l.value < r.value;
}

}