mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-10-29 11:05:43 +00:00
400 lines
9.5 KiB
C++
400 lines
9.5 KiB
C++
#ifndef LLARP_BENCODE_HPP
|
|
#define LLARP_BENCODE_HPP
|
|
|
|
#include <util/buffer.hpp>
|
|
#include <util/bencode.h>
|
|
#include <util/fs.hpp>
|
|
#include <util/logging/logger.hpp>
|
|
#include <util/mem.hpp>
|
|
|
|
#include <fstream>
|
|
#include <set>
|
|
#include <vector>
|
|
|
|
namespace llarp
|
|
{
|
|
template < typename List_t >
|
|
bool
|
|
BEncodeReadList(List_t& result, llarp_buffer_t* buf);
|
|
|
|
inline bool
|
|
BEncodeWriteDictMsgType(llarp_buffer_t* buf, const char* k, const char* t)
|
|
{
|
|
return bencode_write_bytestring(buf, k, 1)
|
|
&& bencode_write_bytestring(buf, t, 1);
|
|
}
|
|
|
|
template < typename Obj_t >
|
|
bool
|
|
BEncodeWriteDictString(const char* k, const Obj_t& str, llarp_buffer_t* buf)
|
|
{
|
|
return bencode_write_bytestring(buf, k, 1)
|
|
&& bencode_write_bytestring(buf, str.data(), str.size());
|
|
}
|
|
|
|
template < typename Obj_t >
|
|
bool
|
|
BEncodeWriteDictEntry(const char* k, const Obj_t& o, llarp_buffer_t* buf)
|
|
{
|
|
return bencode_write_bytestring(buf, k, 1) && o.BEncode(buf);
|
|
}
|
|
|
|
template < typename Int_t >
|
|
bool
|
|
BEncodeWriteDictInt(const char* k, const Int_t& i, llarp_buffer_t* buf)
|
|
{
|
|
return bencode_write_bytestring(buf, k, 1) && bencode_write_uint64(buf, i);
|
|
}
|
|
|
|
template < typename List_t >
|
|
bool
|
|
BEncodeMaybeReadDictList(const char* k, List_t& item, bool& read,
|
|
const llarp_buffer_t& key, llarp_buffer_t* buf)
|
|
{
|
|
if(key == k)
|
|
{
|
|
if(!BEncodeReadList(item, buf))
|
|
{
|
|
return false;
|
|
}
|
|
read = true;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
template < typename Item_t >
|
|
bool
|
|
BEncodeMaybeReadDictEntry(const char* k, Item_t& item, bool& read,
|
|
const llarp_buffer_t& key, llarp_buffer_t* buf)
|
|
{
|
|
if(key == k)
|
|
{
|
|
if(!item.BDecode(buf))
|
|
{
|
|
llarp::LogWarnTag("llarp/bencode.hpp", "failed to decode key ", k,
|
|
" for entry in dict");
|
|
|
|
return false;
|
|
}
|
|
read = true;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
template < typename Int_t >
|
|
bool
|
|
BEncodeMaybeReadDictInt(const char* k, Int_t& i, bool& read,
|
|
const llarp_buffer_t& key, llarp_buffer_t* buf)
|
|
{
|
|
if(key == k)
|
|
{
|
|
if(!bencode_read_integer(buf, &i))
|
|
{
|
|
llarp::LogWarnTag("llarp/BEncode.hpp", "failed to decode key ", k,
|
|
" for integer in dict");
|
|
return false;
|
|
}
|
|
read = true;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
template < typename Item_t >
|
|
bool
|
|
BEncodeMaybeReadVersion(const char* k, Item_t& item, uint64_t expect,
|
|
bool& read, const llarp_buffer_t& key,
|
|
llarp_buffer_t* buf)
|
|
{
|
|
if(key == k)
|
|
{
|
|
if(!bencode_read_integer(buf, &item))
|
|
return false;
|
|
read = item == expect;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
template < typename List_t >
|
|
bool
|
|
BEncodeWriteDictBEncodeList(const char* k, const List_t& l,
|
|
llarp_buffer_t* buf)
|
|
{
|
|
if(!bencode_write_bytestring(buf, k, 1))
|
|
return false;
|
|
if(!bencode_start_list(buf))
|
|
return false;
|
|
|
|
for(const auto& item : l)
|
|
if(!item->BEncode(buf))
|
|
return false;
|
|
return bencode_end(buf);
|
|
}
|
|
|
|
template < typename Array >
|
|
bool
|
|
BEncodeWriteDictArray(const char* k, const Array& array, llarp_buffer_t* buf)
|
|
{
|
|
if(!bencode_write_bytestring(buf, k, 1))
|
|
return false;
|
|
if(!bencode_start_list(buf))
|
|
return false;
|
|
|
|
for(size_t idx = 0; idx < array.size(); ++idx)
|
|
if(!array[idx].BEncode(buf))
|
|
return false;
|
|
return bencode_end(buf);
|
|
}
|
|
|
|
template < typename Iter >
|
|
bool
|
|
BEncodeWriteList(Iter itr, Iter end, llarp_buffer_t* buf)
|
|
{
|
|
if(!bencode_start_list(buf))
|
|
return false;
|
|
while(itr != end)
|
|
if(!itr->BEncode(buf))
|
|
return false;
|
|
else
|
|
++itr;
|
|
return bencode_end(buf);
|
|
}
|
|
|
|
template < typename Sink >
|
|
bool
|
|
bencode_read_dict(Sink&& sink, llarp_buffer_t* buffer)
|
|
{
|
|
if(buffer->size_left() < 2) // minimum case is 'de'
|
|
return false;
|
|
if(*buffer->cur != 'd') // ensure is a dictionary
|
|
return false;
|
|
buffer->cur++;
|
|
while(buffer->size_left() && *buffer->cur != 'e')
|
|
{
|
|
llarp_buffer_t strbuf; // temporary buffer for current element
|
|
if(bencode_read_string(buffer, &strbuf))
|
|
{
|
|
if(!sink(buffer, &strbuf)) // check for early abort
|
|
return false;
|
|
}
|
|
else
|
|
return false;
|
|
}
|
|
|
|
if(*buffer->cur != 'e')
|
|
{
|
|
llarp::LogWarn("reading dict not ending on 'e'");
|
|
// make sure we're at dictionary end
|
|
return false;
|
|
}
|
|
buffer->cur++;
|
|
return sink(buffer, nullptr);
|
|
}
|
|
|
|
template < typename Sink >
|
|
bool
|
|
bencode_decode_dict(Sink&& sink, llarp_buffer_t* buff)
|
|
{
|
|
return bencode_read_dict(
|
|
[&](llarp_buffer_t* buffer, llarp_buffer_t* key) {
|
|
if(key == nullptr)
|
|
return true;
|
|
if(sink.DecodeKey(*key, buffer))
|
|
return true;
|
|
llarp::LogWarnTag("llarp/bencode.hpp", "undefined key '", *key->cur,
|
|
"' for entry in dict");
|
|
|
|
return false;
|
|
},
|
|
buff);
|
|
}
|
|
|
|
template < typename Sink >
|
|
bool
|
|
bencode_read_list(Sink&& sink, llarp_buffer_t* buffer)
|
|
{
|
|
if(buffer->size_left() < 2) // minimum case is 'le'
|
|
return false;
|
|
if(*buffer->cur != 'l') // ensure is a list
|
|
{
|
|
llarp::LogWarn("bencode::bencode_read_list - expecting list got ",
|
|
*buffer->cur);
|
|
return false;
|
|
}
|
|
|
|
buffer->cur++;
|
|
while(buffer->size_left() && *buffer->cur != 'e')
|
|
{
|
|
if(!sink(buffer, true)) // check for early abort
|
|
return false;
|
|
}
|
|
if(*buffer->cur != 'e') // make sure we're at a list end
|
|
return false;
|
|
buffer->cur++;
|
|
return sink(buffer, false);
|
|
}
|
|
|
|
template < typename Array >
|
|
bool
|
|
BEncodeReadArray(Array& array, llarp_buffer_t* buf)
|
|
{
|
|
size_t idx = 0;
|
|
return bencode_read_list(
|
|
[&array, &idx](llarp_buffer_t* buffer, bool has) {
|
|
if(has)
|
|
{
|
|
if(idx >= array.size())
|
|
return false;
|
|
if(!array[idx++].BDecode(buffer))
|
|
return false;
|
|
}
|
|
return true;
|
|
},
|
|
buf);
|
|
}
|
|
|
|
template < typename List_t >
|
|
bool
|
|
BEncodeReadList(List_t& result, llarp_buffer_t* buf)
|
|
{
|
|
return bencode_read_list(
|
|
[&result](llarp_buffer_t* buffer, bool has) {
|
|
if(has)
|
|
{
|
|
if(!result.emplace(result.end())->BDecode(buffer))
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
},
|
|
buf);
|
|
}
|
|
|
|
template < typename List_t >
|
|
bool
|
|
BEncodeWriteDictList(const char* k, List_t& list, llarp_buffer_t* buf)
|
|
{
|
|
return bencode_write_bytestring(buf, k, 1)
|
|
&& BEncodeWriteList(list.begin(), list.end(), buf);
|
|
}
|
|
|
|
template < size_t bufsz, typename T >
|
|
void
|
|
Dump(const T& val)
|
|
{
|
|
std::array< byte_t, bufsz > tmp;
|
|
llarp_buffer_t buf(tmp);
|
|
if(val.BEncode(&buf))
|
|
{
|
|
llarp::DumpBuffer< decltype(buf), 128 >(buf);
|
|
}
|
|
}
|
|
|
|
/// read entire file and decode its contents into t
|
|
template < typename T >
|
|
bool
|
|
BDecodeReadFile(const char* fpath, T& t)
|
|
{
|
|
std::vector< byte_t > ptr;
|
|
{
|
|
std::ifstream f;
|
|
f.open(fpath);
|
|
if(!f.is_open())
|
|
{
|
|
return false;
|
|
}
|
|
f.seekg(0, std::ios::end);
|
|
const std::streampos sz = f.tellg();
|
|
f.seekg(0, std::ios::beg);
|
|
ptr.resize(sz);
|
|
f.read((char*)ptr.data(), sz);
|
|
}
|
|
llarp_buffer_t buf(ptr);
|
|
auto result = t.BDecode(&buf);
|
|
if(!result)
|
|
{
|
|
DumpBuffer(buf);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/// read entire file and decode its contents into t
|
|
template < typename T >
|
|
bool
|
|
BDecodeReadFromFile(const char* fpath, T& t)
|
|
{
|
|
std::vector< byte_t > ptr;
|
|
{
|
|
std::ifstream f;
|
|
f.open(fpath);
|
|
if(!f.is_open())
|
|
{
|
|
return false;
|
|
}
|
|
f.seekg(0, std::ios::end);
|
|
const std::streampos sz = f.tellg();
|
|
f.seekg(0, std::ios::beg);
|
|
ptr.resize(sz);
|
|
f.read((char*)ptr.data(), sz);
|
|
}
|
|
llarp_buffer_t buf(ptr);
|
|
auto result = bencode_decode_dict(t, &buf);
|
|
if(!result)
|
|
{
|
|
DumpBuffer(buf);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/// bencode and write to file
|
|
template < typename T, size_t bufsz >
|
|
bool
|
|
BEncodeWriteFile(const char* fpath, const T& t)
|
|
{
|
|
std::array< byte_t, bufsz > tmp;
|
|
llarp_buffer_t buf(tmp);
|
|
if(!t.BEncode(&buf))
|
|
return false;
|
|
buf.sz = buf.cur - buf.base;
|
|
{
|
|
const fs::path path = std::string(fpath);
|
|
auto optional_f =
|
|
llarp::util::OpenFileStream< std::ofstream >(path, std::ios::binary);
|
|
if(!optional_f)
|
|
return false;
|
|
auto& f = optional_f.value();
|
|
if(!f.is_open())
|
|
return false;
|
|
f.write((char*)buf.base, buf.sz);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/// seek for an int in a dict with a key k used for version
|
|
/// set v to parsed value if found
|
|
/// this call rewinds the buffer unconditionally before return
|
|
/// returns false only if there was
|
|
template < typename Int_t >
|
|
bool
|
|
BEncodeSeekDictVersion(Int_t& v, llarp_buffer_t* buf, const byte_t k)
|
|
{
|
|
const auto ret = bencode_read_dict(
|
|
[&v, k](llarp_buffer_t* buffer, llarp_buffer_t* key) -> bool {
|
|
if(key == nullptr)
|
|
return true;
|
|
if(key->sz == 1 && *key->cur == k)
|
|
{
|
|
return bencode_read_integer(buffer, &v);
|
|
}
|
|
return bencode_discard(buffer);
|
|
},
|
|
buf);
|
|
// rewind
|
|
buf->cur = buf->base;
|
|
return ret;
|
|
}
|
|
|
|
} // namespace llarp
|
|
|
|
#endif
|