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/*
* rfc4251.h -- implements types from RFC 4251, section 5
*
* rfc4251byte byte
* rfc4251bool bool
* rfc4251uint32 uint32
* rfc4251uint64 uint64
* rfc4251string 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 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>
struct rfc4251byte {
union {
uint8_t value;
char buf[1];
};
rfc4251byte () = default;
explicit rfc4251byte (uint8_t v) : value(v) {}
inline explicit rfc4251byte (std::istream &);
operator uint8_t () const { return value; }
};
inline std::istream & operator>> (std::istream & is, rfc4251byte & x) {
return is.read(x.buf, sizeof(x.buf));
}
inline std::ostream & operator<< (std::ostream & os, rfc4251byte const & x) {
return os.write(x.buf, sizeof(x.buf));
}
inline rfc4251byte::rfc4251byte (std::istream & is) {
is >> *this;
}
struct rfc4251bool {
union {
bool value;
char buf[1];
};
rfc4251bool () = default;
explicit rfc4251bool (uint8_t v) : value(v) {}
inline explicit rfc4251bool (std::istream &);
operator uint8_t () const { return value; }
};
inline std::istream & operator>> (std::istream & is, rfc4251bool & x) {
return is.read(x.buf, sizeof(x.buf));
}
inline std::ostream & operator<< (std::ostream & os, rfc4251bool const & x) {
return os.write(x.buf, sizeof(x.buf));
}
inline rfc4251bool::rfc4251bool (std::istream & is) {
is >> *this;
}
struct rfc4251uint32 {
union {
uint32_t value;
char buf[4];
};
rfc4251uint32 () = default;
explicit rfc4251uint32 (uint32_t v) { value = htonl(v); }
inline explicit rfc4251uint32 (std::istream &);
operator uint32_t () const { return ntohl(value); }
};
inline std::istream & operator>> (std::istream & is, rfc4251uint32 & x) {
return is.read(x.buf, sizeof(x.buf));
}
inline std::ostream & operator<< (std::ostream & os, rfc4251uint32 const & x) {
return os.write(x.buf, sizeof(x.buf));
}
inline rfc4251uint32::rfc4251uint32 (std::istream & is) {
is >> *this;
}
struct rfc4251uint64 {
union {
uint64_t value;
char buf[8];
};
rfc4251uint64 () = default;
inline explicit rfc4251uint64 (uint64_t v);
inline explicit rfc4251uint64 (std::istream &);
inline explicit operator uint64_t () const;
};
inline rfc4251uint64::rfc4251uint64 (uint64_t v) {
for (int_fast8_t i{7}; i >= 0; --i) {
buf[i] = v & 0xff;
v >>= 8;
}
}
inline rfc4251uint64::operator uint64_t () const {
uint64_t ret{0};
for (uint_fast8_t i{0}; i < 8; ++i) {
ret |= buf[i];
ret <<= 8;
}
return ret;
}
inline std::istream & operator>> (std::istream & is, rfc4251uint64 & x) {
return is.read(x.buf, sizeof(x.buf));
}
inline std::ostream & operator<< (std::ostream & os, rfc4251uint64 const & x) {
return os.write(x.buf, sizeof(x.buf));
}
inline rfc4251uint64::rfc4251uint64 (std::istream & is) {
is >> *this;
}
struct rfc4251string : boost::totally_ordered<rfc4251string> {
std::vector<char> value;
rfc4251string () = default;
inline explicit rfc4251string (char const *, size_t);
explicit rfc4251string (std::string const & s) : rfc4251string{s.data(), s.size()} {}
explicit rfc4251string (std::vector<std::string> const &);
explicit rfc4251string (mpz_srcptr);
explicit rfc4251string (mpz_class const & x) : rfc4251string{x.get_mpz_t()} {}
inline explicit rfc4251string (std::istream &);
operator std::string () const { return {value.begin(), value.end()}; }
operator std::vector<std::string> () const;
operator mpz_class () const;
};
inline rfc4251string::rfc4251string (char const * s, size_t l) {
if (l > std::numeric_limits<uint32_t>::max())
throw std::length_error{"32-bit limit for rfc4251string exceeded"};
value.insert(value.end(), s, s + l);
}
inline std::istream & operator>> (std::istream & is, rfc4251string & s) {
s.value.clear();
rfc4251uint32 len;
if (is >> len) {
s.value.resize(len);
is.read(s.value.data(), len);
}
return is;
}
inline std::ostream & operator<< (std::ostream & os, rfc4251string const & s) {
if (s.value.size() > std::numeric_limits<uint32_t>::max())
throw std::length_error{"32-bit limit for rfc4251string exceeded"};
if (os << rfc4251uint32{static_cast<uint32_t>(s.value.size())})
os.write(s.value.data(), s.value.size());
return os;
}
inline rfc4251string::rfc4251string (std::istream & is) {
is >> *this;
}
inline bool operator== (rfc4251string const & l, rfc4251string const & r) {
return l.value == r.value;
}
inline bool operator< (rfc4251string const & l, rfc4251string const & r) {
return l.value < r.value;
}
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