搜狗代理服务器程序，网上已经有
用 Python 实现的版本。这个版本在某些情况下（例如迅雷下载）性能不够好，于是我用 C++ 实现了一个版本，基于
POCO 框架开发，应当具有不错的可移植性。完整的源代码如下：
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <vector>
#include <string>
#include <Poco/ErrorHandler.h>
#include <Poco/Net/Socket.h>
#include <Poco/Net/HTTPServer.h>
#include <Poco/Net/HTTPServerRequest.h>
#include <Poco/Net/HTTPServerRequestImpl.h>
#include <Poco/Net/HTTPServerResponse.h>
#include <Poco/Net/HTTPRequestHandler.h>
#include <Poco/Net/HTTPClientSession.h>
#include <Windows.h>
using namespace std;
using namespace Poco;
using namespace Poco::Net;
class EH : public ErrorHandler
{
public:
virtual void exception(const Exception& exc)
{
puts(exc.message().c_str());
fflush(stdout);
}
virtual void exception(const std::exception& exc)
{
puts(exc.what());
fflush(stdout);
}
virtual void exception()
{
puts("Unknown exception");
fflush(stdout);
}
};
const int BUFFER_SIZE = 65536;
char addressFormat[128];
int lower, upper;
class ProxyService : public HTTPRequestHandler
{
HTTPClientSession client;
static unsigned int hashTag(const string &s)
{
unsigned int code = s.length();
for (int i = 0; i < s.length() / 4; ++i)
{
unsigned int a = (s[i * 4] & 0xffu) + ((s[i * 4 + 1] & 0xffu) << 8);
unsigned int b = (s[i * 4 + 2] & 0xffu) + ((s[i * 4 + 3] & 0xffu) << 8);
code += a;
code ^= ((code << 5) ^ b) << 0xb;
code += code >> 0xb;
}
switch (s.length() % 4)
{
case 1:
code += s[s.length() - 1] & 0xffu;
code ^= code << 0xa;
code += code >> 1;
break;
case 2:
code += (s[s.length() - 2] & 0xffu) + ((s[s.length() - 1] & 0xffu) << 8);
code ^= code << 0xb;
code += code >> 0x11;
break;
case 3:
code += (s[s.length() - 3] & 0xffu) + ((s[s.length() - 2] & 0xffu) << 8);
code ^= (code ^ ((s[s.length() - 1] & 0xffu) << 2)) << 0x10;
code += code >> 0xb;
break;
}
code ^= code << 3;
code += code >> 5;
code ^= code << 4;
code += code >> 0x11;
code ^= code << 0x19;
code += code >> 6;
return code;
}
static string hexString(unsigned int x)
{
char buff[128];
sprintf(buff, "%08x", x);
return string(buff, buff + 8);
}
void write(istream &in, ostream &out)
{
char buffer[BUFFER_SIZE];
streamsize sz;
while (in.good() && out.good())
{
in.read(buffer, sizeof(buffer));
sz = in.gcount();
if (sz <= 0)
break;
if (out.good())
out.write(buffer, sz);
}
}
public:
ProxyService()
{
static int xid;
char host[128];
int id = xid + 1;
if (id > upper || id < lower)
id = lower;
xid = id;
sprintf(host, addressFormat, id);
client.setHost(host);
client.setPort(80);
}
virtual void handleRequest(HTTPServerRequest& request, HTTPServerResponse& response)
{
printf("[%s] %s\n", request.getMethod().c_str(), request.getURI().c_str());
fflush(stdout);
static const string authToken = "5FA7CF6A1809B3B514FA66A1ECA16FEB/30/78e7ff933a9a3063";
string timestamp(hexString((unsigned)time(0)));
string tag(hexString(hashTag(timestamp + request.getHost() + "SogouExplorerProxy")));
try
{
HTTPRequest clientRequest(request.getMethod(), request.getURI(), request.getVersion());
for (NameValueCollection::ConstIterator i = request.begin(); i != request.end(); ++i)
clientRequest.set(i->first, i->second);
clientRequest.set("X-Sogou-Auth", authToken);
clientRequest.set("X-Sogou-Tag", tag);
clientRequest.set("X-Sogou-Timestamp", timestamp);
ostream& os = client.sendRequest(clientRequest);
os.flush();
if (toUpper(request.getMethod()) == "POST")
{
write(request.stream(), os);
os.flush();
}
HTTPResponse clientResponse;
istream& is = client.receiveResponse(clientResponse);
response.setStatusAndReason(clientResponse.getStatus(), clientResponse.getReason());
for (NameValueCollection::ConstIterator i = clientResponse.begin(); i != clientResponse.end(); ++i)
response.set(i->first, i->second);
ostream& out = response.send();
out.flush();
if (toUpper(request.getMethod()) == "CONNECT" && clientResponse.getStatus() == HTTPResponse::HTTP_OK)
{
char buffer[BUFFER_SIZE];
int sz;
istream &in = request.stream();
sz = (int)is.readsome(buffer, sizeof(buffer));
if (sz > 0)
{
out.write(buffer, sz);
out.flush();
}
sz = (int)in.readsome(buffer, sizeof(buffer));
if (sz > 0)
{
os.write(buffer, sz);
os.flush();
}
StreamSocket s1 = client.socket();
StreamSocket s2 = ((HTTPServerRequestImpl*)&request)->socket();
vector<Socket> list, l2, l3;
while (true)
{
list.clear();
list.push_back(s1);
list.push_back(s2);
Socket::select(list, l2, l3, Timespan(20, 0));
if (list.empty())
break;
if (list[0] == s2)
{
sz = s2.receiveBytes(buffer, sizeof(buffer));
if (sz <= 0)
break;
s1.sendBytes(buffer, sz);
}
else
{
sz = s1.receiveBytes(buffer, sizeof(buffer));
if (sz <= 0)
break;
s2.sendBytes(buffer, sz);
}
}
}
else
{
write(is, out);
out.flush();
}
}
catch (const Exception &)
{
client.reset();
}
}
};
class ProxyRequestHandlerFactory : public HTTPRequestHandlerFactory
{
public:
virtual HTTPRequestHandler *createRequestHandler(const HTTPServerRequest & request)
{
return new ProxyService;
}
};
int main(int argc, char **argv)
{
FILE *fp = fopen("config.txt", "r");
if (!fp)
{
puts("Fail to open config.txt");
return 1;
}
if (fscanf(fp, "%d%d%s", &lower, &upper, addressFormat) != 3)
{
puts("Invalid config.txt");
return 2;
}
fclose(fp);
ThreadPool::defaultPool().addCapacity(256 - ThreadPool::defaultPool().capacity());
ErrorHandler::set(new EH);
ServerSocket socket;
socket.bind(SocketAddress(8118), true);
socket.listen();
HTTPServerParams *params = new HTTPServerParams;
params->setMaxThreads(128);
params->setServerName("ProxyService");
params->setSoftwareVersion("1.0");
HTTPServer server(new ProxyRequestHandlerFactory(), socket, params);
server.start();
while (true)
{
Thread::sleep(65535);
}
server.stop();
return 0;
}