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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#include "PeerMessageUtil.h"
#include <cassert>
#include <cstring>
#include "DlAbortEx.h"
#include "a2netcompat.h"
#include "StringFormat.h"
#include "BtConstants.h"
#include "message.h"
#include "StringFormat.h"
namespace aria2 {
uint8_t PeerMessageUtil::getId(const unsigned char* msg) {
return msg[0];
}
uint32_t PeerMessageUtil::getIntParam(const unsigned char* msg, size_t pos)
{
uint32_t nParam;
memcpy(&nParam, msg+pos, sizeof(nParam));
return ntohl(nParam);
}
uint16_t PeerMessageUtil::getShortIntParam(const unsigned char* msg, size_t pos) {
uint16_t nParam;
memcpy(&nParam, msg+pos, sizeof(nParam));
return ntohs(nParam);
}
void PeerMessageUtil::checkIndex(size_t index, size_t pieces) {
if(!(index < pieces)) {
throw DL_ABORT_EX(StringFormat("Invalid index: %lu",
static_cast<unsigned long>(index)).str());
}
}
void PeerMessageUtil::checkBegin(uint32_t begin, size_t pieceLength) {
if(!(begin < pieceLength)) {
throw DL_ABORT_EX(StringFormat("Invalid begin: %u", begin).str());
}
}
void PeerMessageUtil::checkLength(size_t length) {
if(length > MAX_BLOCK_LENGTH) {
throw DL_ABORT_EX(StringFormat("Length too long: %lu > %uKB",
static_cast<unsigned long>(length),
MAX_BLOCK_LENGTH/1024).str());
}
if(length == 0) {
throw DL_ABORT_EX(StringFormat("Invalid length: %lu",
static_cast<unsigned long>(length)).str());
}
}
void PeerMessageUtil::checkRange(uint32_t begin, size_t length, size_t pieceLength) {
if(!(0 < length)) {
throw DL_ABORT_EX(StringFormat("Invalid range: begin=%u, length=%lu",
begin,
static_cast<unsigned long>(length)).str());
}
uint32_t end = begin+length;
if(!(end <= pieceLength)) {
throw DL_ABORT_EX(StringFormat("Invalid range: begin=%u, length=%lu",
begin,
static_cast<unsigned long>(length)).str());
}
}
void PeerMessageUtil::checkBitfield(const unsigned char* bitfield,
size_t bitfieldLength,
size_t pieces) {
if(!(bitfieldLength == (pieces+7)/8)) {
throw DL_ABORT_EX
(StringFormat("Invalid bitfield length: %lu",
static_cast<unsigned long>(bitfieldLength)).str());
}
char lastbyte = bitfield[bitfieldLength-1];
for(size_t i = 0; i < 8-pieces%8 && pieces%8 != 0; ++i) {
if(!(((lastbyte >> i) & 1) == 0)) {
throw DL_ABORT_EX("Invalid bitfield");
}
}
}
void PeerMessageUtil::setIntParam(unsigned char* dest, uint32_t param) {
uint32_t nParam = htonl(param);
memcpy(dest, &nParam, sizeof(nParam));
}
void PeerMessageUtil::setShortIntParam(unsigned char* dest, uint16_t param) {
uint16_t nParam = htons(param);
memcpy(dest, &nParam, sizeof(nParam));
}
void PeerMessageUtil::createPeerMessageString(unsigned char* msg,
size_t msgLength,
size_t payloadLength,
uint8_t messageId) {
assert(msgLength >= 5);
memset(msg, 0, msgLength);
setIntParam(msg, payloadLength);
msg[4] = messageId;
}
bool
PeerMessageUtil::createcompact(unsigned char* compact, const std::string& addr, uint16_t port)
{
struct addrinfo hints;
struct addrinfo* res;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET; // since compact peer format is ipv4 only.
hints.ai_flags = AI_NUMERICHOST;
if(getaddrinfo(addr.c_str(), 0, &hints, &res)) {
return false;
}
struct sockaddr_in* in = reinterpret_cast<struct sockaddr_in*>(res->ai_addr);
uint32_t* addrp = (uint32_t*)compact;
*addrp = in->sin_addr.s_addr;
uint16_t* portp = (uint16_t*)(compact+4);
*portp = htons(port);
freeaddrinfo(res);
return true;
}
std::pair<std::string, uint16_t>
PeerMessageUtil::unpackcompact(const unsigned char* compact)
{
struct sockaddr_in in;
memset(&in, 0, sizeof(in));
#ifdef HAVE_SOCKADDR_IN_SIN_LEN
// For netbsd
in.sin_len = sizeof(in);
#endif // HAVE_SOCKADDR_IN_SIN_LEN
in.sin_family = AF_INET;
in.sin_addr.s_addr = *reinterpret_cast<const uint32_t*>(compact);
in.sin_port = 0;
char host[NI_MAXHOST];
int s;
s = getnameinfo(reinterpret_cast<const struct sockaddr*>(&in), sizeof(in),
host, NI_MAXHOST, 0, NI_MAXSERV,
NI_NUMERICHOST);
if(s) {
return std::pair<std::string, uint16_t>();
}
uint16_t port = ntohs(*(uint16_t*)(compact+sizeof(uint32_t)));
return std::pair<std::string, uint16_t>(host, port);
}
void PeerMessageUtil::assertPayloadLengthGreater
(size_t threshold, size_t actual, const std::string& msgName)
{
if(actual <= threshold) {
throw DL_ABORT_EX
(StringFormat(MSG_TOO_SMALL_PAYLOAD_SIZE, msgName.c_str(), actual).str());
}
}
void PeerMessageUtil::assertPayloadLengthEqual
(size_t expected, size_t actual, const std::string& msgName)
{
if(expected != actual) {
throw DL_ABORT_EX
(StringFormat(EX_INVALID_PAYLOAD_SIZE, msgName.c_str(),
actual, expected).str());
}
}
void PeerMessageUtil::assertID
(uint8_t expected, const unsigned char* data, const std::string& msgName)
{
uint8_t id = getId(data);
if(expected != id) {
throw DL_ABORT_EX
(StringFormat(EX_INVALID_BT_MESSAGE_ID, id, msgName.c_str(),
expected).str());
}
}
} // namespace aria2
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