mirror of
https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 20:13:05 +02:00
04b2a3c9b7
Signed-off-by: Samuli Seppänen <samuli@openvpn.net>
231 lines
5.6 KiB
C++
231 lines
5.6 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2016 OpenVPN Technologies, Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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// A collection of functions for rendering and parsing hexadecimal strings
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#ifndef OPENVPN_COMMON_HEXSTR_H
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#define OPENVPN_COMMON_HEXSTR_H
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#include <string>
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#include <iomanip>
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#include <sstream>
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#include <openvpn/common/exception.hpp>
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#include <openvpn/common/string.hpp>
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namespace openvpn {
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inline char render_hex_char(const int c, const bool caps=false)
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{
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if (c < 10)
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return '0' + c;
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else if (c < 16)
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return (caps ? 'A' : 'a') - 10 + c;
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else
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return '?';
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}
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inline int parse_hex_char(const char c)
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{
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if (c >= '0' && c <= '9')
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return c - '0';
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else if (c >= 'a' && c <= 'f')
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return c - 'a' + 10;
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else if (c >= 'A' && c <= 'F')
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return c - 'A' + 10;
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else
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return -1;
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}
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inline std::string render_hex(const unsigned char *data, size_t size, const bool caps=false)
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{
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if (!data)
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return "NULL";
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std::string ret;
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ret.reserve(size*2+1);
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while (size--)
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{
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const unsigned char c = *data++;
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ret += render_hex_char(c >> 4, caps);
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ret += render_hex_char(c & 0x0F, caps);
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}
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return ret;
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}
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inline std::string render_hex_sep(const unsigned char *data, size_t size, const char sep, const bool caps=false)
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{
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if (!data)
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return "NULL";
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std::string ret;
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ret.reserve(size*3);
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bool prsep = false;
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while (size--)
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{
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if (prsep)
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ret += sep;
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const unsigned char c = *data++;
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ret += render_hex_char(c >> 4, caps);
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ret += render_hex_char(c & 0x0F, caps);
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prsep = true;
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}
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return ret;
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}
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template <typename V>
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inline std::string render_hex_generic(const V& data, const bool caps=false)
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{
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std::string ret;
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ret.reserve(data.size()*2+1);
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for (size_t i = 0; i < data.size(); ++i)
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{
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const unsigned char c = data[i];
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ret += render_hex_char(c >> 4, caps);
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ret += render_hex_char(c & 0x0F, caps);
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}
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return ret;
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}
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inline std::string dump_hex(const unsigned char *data, size_t size)
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{
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if (!data)
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return "NULL\n";
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const unsigned int mask = 0x0F; // N bytes per line - 1
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std::ostringstream os;
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os << std::hex;
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std::string chars;
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size_t i;
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for (i = 0; i < size; ++i)
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{
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if (!(i & mask))
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{
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if (i)
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{
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os << " " << chars << std::endl;
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chars.clear();
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}
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os << std::setfill(' ') << std::setw(8) << i << ":";
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}
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const unsigned char c = data[i];
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os << ' ' << std::setfill('0') << std::setw(2) << (unsigned int)c;
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if (string::is_printable(c))
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chars += c;
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else
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chars += '.';
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}
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if (i)
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os << string::spaces(2 + (((i-1) & mask) ^ mask) * 3) << chars << std::endl;
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return os.str();
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}
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inline std::string dump_hex(const std::string& str)
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{
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return dump_hex((const unsigned char *)str.c_str(), str.length());
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}
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template <typename V>
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inline std::string dump_hex(const V& data)
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{
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return dump_hex(data.c_data(), data.size());
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}
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OPENVPN_SIMPLE_EXCEPTION(parse_hex_error);
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template <typename V>
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inline void parse_hex(V& dest, const std::string& str)
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{
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const int len = int(str.length());
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int i;
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for (i = 0; i <= len - 2; i += 2)
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{
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const int high = parse_hex_char(str[i]);
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const int low = parse_hex_char(str[i+1]);
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if (high == -1 || low == -1)
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throw parse_hex_error();
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dest.push_back((high<<4) + low);
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}
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if (i != len)
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throw parse_hex_error(); // straggler char
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}
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// note -- currently doesn't detect overflow
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template <typename T>
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inline bool parse_hex_number(const char *str, T& retval)
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{
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if (!str[0])
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return false; // empty string
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size_t i = 0;
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T ret = T(0);
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while (true)
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{
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const char c = str[i++];
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const int hd = parse_hex_char(c);
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if (hd >= 0)
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{
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ret *= T(16);
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ret += T(hd);
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}
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else if (!c)
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{
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retval = ret;
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return true;
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}
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else
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return false; // non-hex-digit
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}
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}
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template <typename T>
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inline bool parse_hex_number(const std::string& str, T& retval)
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{
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return parse_hex_number(str.c_str(), retval);
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}
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template <typename T>
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inline T parse_hex_number(const std::string& str)
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{
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T ret;
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if (!parse_hex_number<T>(str.c_str(), ret))
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throw parse_hex_error();
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return ret;
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}
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template <typename T>
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std::string render_hex_number(T value, const bool caps=false)
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{
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unsigned char buf[sizeof(T)];
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for (size_t i = sizeof(T); i --> 0 ;)
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{
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buf[i] = value & 0xFF;
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value >>= 8;
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}
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return render_hex(buf, sizeof(T), caps);
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}
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std::string render_hex_number(unsigned char uc, const bool caps=false)
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{
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unsigned char buf[1] = { uc };
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return render_hex(buf, 1, caps);
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}
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} // namespace openvpn
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#endif // OPENVPN_COMMON_HEXSTR_H
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