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generated by cgit v1.2.3 (git 2.39.1) at 2025-03-12 21:24:15 +0000

/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser 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.
*/

#include "socket.h" // for select()
#include "porting.h" // for sleep_ms(), get_sysinfo(), secure_rand_fill_buf()
#include "httpfetch.h"
#include <iostream>
#include <sstream>
#include <list>
#include <map>
#include <errno.h>
#include "threading/event.h"
#include "config.h"
#include "exceptions.h"
#include "debug.h"
#include "log.h"
#include "util/container.h"
#include "util/thread.h"
#include "version.h"
#include "settings.h"
#include "noise.h"

Mutex g_httpfetch_mutex;
std::map<unsigned long, std::queue<HTTPFetchResult> > g_httpfetch_results;
PcgRandom g_callerid_randomness;

HTTPFetchRequest::HTTPFetchRequest()
{
	url = "";
	caller = HTTPFETCH_DISCARD;
	request_id = 0;
	timeout = g_settings->getS32("curl_timeout");
	connect_timeout = timeout;
	multipart = false;

	useragent = std::string(PROJECT_NAME_C "/") + g_version_hash + " (" + porting::get_sysinfo() + ")";
}


static void httpfetch_deliver_result(const HTTPFetchResult &fetch_result)
{
	unsigned long caller = fetch_result.caller;
	if (caller != HTTPFETCH_DISCARD) {
		MutexAutoLock lock(g_httpfetch_mutex);
		g_httpfetch_results[caller].push(fetch_result);
	}
}

static void httpfetch_request_clear(unsigned long caller);

unsigned long httpfetch_caller_alloc()
{
	MutexAutoLock lock(g_httpfetch_mutex);

	// Check each caller ID except HTTPFETCH_DISCARD
	const unsigned long discard = HTTPFETCH_DISCARD;
	for (unsigned long caller = discard + 1; caller != discard; ++caller) {
		std::map<unsigned long, std::queue<HTTPFetchResult> >::iterator
			it = g_httpfetch_results.find(caller);
		if (it == g_httpfetch_results.end()) {
			verbosestream << "httpfetch_caller_alloc: allocating "
					<< caller << std::endl;
			// Access element to create it
			g_httpfetch_results[caller];
			return caller;
		}
	}

	FATAL_ERROR("httpfetch_caller_alloc: ran out of caller IDs");
	return discard;
}

unsigned long httpfetch_caller_alloc_secure()
{
	MutexAutoLock lock(g_httpfetch_mutex);

	// Generate random caller IDs and make sure they're not
	// already used or equal to HTTPFETCH_DISCARD
	// Give up after 100 tries to prevent infinite loop
	u8 tries = 100;
	unsigned long caller;

	do {
		caller = (((u64) g_callerid_randomness.next()) << 32) |
				g_callerid_randomness.next();

		if (--tries < 1) {
			FATAL_ERROR("httpfetch_caller_alloc_secure: ran out of caller IDs");
			return HTTPFETCH_DISCARD;
		}
	} while (g_httpfetch_results.find(caller) != g_httpfetch_results.end());

	verbosestream << "httpfetch_caller_alloc_secure: allocating "
		<< caller << std::endl;

	// Access element to create it
	g_httpfetch_results[caller];
	return caller;
}

void httpfetch_caller_free(unsigned long caller)
{
	verbosestream<<"httpfetch_caller_free: freeing "
			<<caller<<std::endl;

	httpfetch_request_clear(caller);
	if (caller != HTTPFETCH_DISCARD) {
		MutexAutoLock lock(g_httpfetch_mutex);
		g_httpfetch_results.erase(caller);
	}
}

bool httpfetch_async_get(unsigned long caller, HTTPFetchResult &fetch_result)
{
	MutexAutoLock lock(g_httpfetch_mutex);

	// Check that caller exists
	std::map<unsigned long, std::queue<HTTPFetchResult> >::iterator
		it = g_httpfetch_results.find(caller);
	if (it == g_httpfetch_results.end())
		return false;

	// Check that result queue is nonempty
	std::queue<HTTPFetchResult> &caller_results = it->second;
	if (caller_results.empty())
		return false;

	// Pop first result
	fetch_result = caller_results.front();
	caller_results.pop();
	return true;
}

#if USE_CURL
#include <curl/curl.h>

/*
	USE_CURL is on: use cURL based httpfetch implementation
*/

static size_t httpfetch_writefunction(
		char *ptr, size_t size, size_t nmemb, void *userdata)
{
	std::ostringstream *stream = (std::ostringstream*)userdata;
	size_t count = size * nmemb;
	stream->write(ptr, count);
	return count;
}

static size_t httpfetch_discardfunction(
		char *ptr, size_t size, size_t nmemb, void *userdata)
{
	return size * nmemb;
}

class CurlHandlePool
{
	std::list<CURL*> handles;

public:
	CurlHandlePool() {}
	~CurlHandlePool()
	{
		for (std::list<CURL*>::iterator it = handles.begin();
				it != handles.end(); ++it) {
			curl_easy_cleanup(*it);
		}
	}
	CURL * alloc()
	{
		CURL *curl;
		if (handles.empty()) {
			curl = curl_easy_init();
			if (curl == NULL) {
				errorstream<<"curl_easy_init returned NULL"<<std::endl;
			}
		}
		else {
			curl = handles.front();
			handles.pop_front();
		}
		return curl;
	}
	void free(CURL *handle)
	{
		if (handle)
			handles.push_back(handle);
	}
};

class HTTPFetchOngoing
{
public:
	HTTPFetchOngoing(HTTPFetchRequest request, CurlHandlePool *pool);
	~HTTPFetchOngoing();

	CURLcode start(CURLM *multi);
	const HTTPFetchResult * complete(CURLcode res);

	const HTTPFetchRequest &getRequest()    const { return request; };
	const CURL             *getEasyHandle() const { return curl; };

private:
	CurlHandlePool *pool;
	CURL *curl;
	CURLM *multi;
	HTTPFetchRequest request;
	HTTPFetchResult result;
	std::ostringstream oss;
	struct curl_slist *http_header;
	curl_httppost *post;
};


HTTPFetchOngoing::HTTPFetchOngoing(HTTPFetchRequest request_, CurlHandlePool *pool_):
	pool(pool_),
	curl(NULL),
	multi(NULL),
	request(request_),
	result(request_),
	oss(std::ios::binary),
	http_header(NULL),
	post(NULL)
{
	curl = pool->alloc();
	if (curl == NULL) {
		return;
	}

	// Set static cURL options
	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
	curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
	curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 1);

	std::string bind_address = g_settings->get("bind_address");
	if (!bind_address.empty()) {
		curl_easy_setopt(curl, CURLOPT_INTERFACE, bind_address.c_str());
	}