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Aquaria/ExternalLibs/minihttp.cpp

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// minihttp.cpp - All functionality required for a minimal TCP/HTTP client packed in one file.
// Released under the WTFPL (See minihttp.h)
#ifdef _MSC_VER
# ifndef _CRT_SECURE_NO_WARNINGS
# define _CRT_SECURE_NO_WARNINGS
# endif
# ifndef _CRT_SECURE_NO_DEPRECATE
# define _CRT_SECURE_NO_DEPRECATE
# endif
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sstream>
#include <cctype>
#include <cerrno>
#include <algorithm>
#ifdef _WIN32
# ifndef _WIN32_WINNT
# define _WIN32_WINNT 0x0501
# endif
# include <winsock2.h>
# include <ws2tcpip.h>
# define EWOULDBLOCK WSAEWOULDBLOCK
# define ETIMEDOUT WSAETIMEDOUT
# define ECONNRESET WSAECONNRESET
# define ENOTCONN WSAENOTCONN
#else
# include <sys/types.h>
# include <unistd.h>
# include <fcntl.h>
# include <sys/socket.h>
# include <netdb.h>
# define SOCKET_ERROR (-1)
# define INVALID_SOCKET (SOCKET)(~0)
typedef intptr_t SOCKET;
#endif
#include "minihttp.h"
#define SOCKETVALID(s) ((s) != INVALID_SOCKET)
#ifdef _MSC_VER
# define STRNICMP _strnicmp
#else
# define STRNICMP strncasecmp
#endif
#ifdef _DEBUG
# define traceprint(...) {printf(__VA_ARGS__);}
#else
# define traceprint(...) {}
#endif
namespace minihttp {
#define DEFAULT_BUFSIZE 4096
inline int _GetError()
{
#ifdef _WIN32
return WSAGetLastError();
#else
return errno;
#endif
}
inline std::string _GetErrorStr(int e)
{
#ifdef _WIN32
LPTSTR s;
::FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, NULL, e, 0, (LPTSTR)&s, 0, NULL);
std::string ret = s;
::LocalFree(s);
return ret;
#endif
return strerror(e);
}
bool InitNetwork()
{
#ifdef _WIN32
WSADATA wsadata;
if(WSAStartup(MAKEWORD(2,2), &wsadata))
{
traceprint("WSAStartup ERROR: %s", _GetErrorStr(_GetError()).c_str());
return false;
}
#endif
return true;
}
void StopNetwork()
{
#ifdef _WIN32
WSACleanup();
#endif
}
static bool _Resolve(const char *host, unsigned int port, struct sockaddr_in *addr)
{
char port_str[15];
sprintf(port_str, "%u", port);
struct addrinfo hnt, *res = 0;
memset(&hnt, 0, sizeof(hnt));
hnt.ai_family = AF_INET;
hnt.ai_socktype = SOCK_STREAM;
if (getaddrinfo(host, port_str, &hnt, &res))
{
traceprint("RESOLVE ERROR: %s", _GetErrorStr(_GetError()).c_str());
return false;
}
if (res)
{
if (res->ai_family != AF_INET)
{
traceprint("RESOLVE WTF: %s", _GetErrorStr(_GetError()).c_str());
freeaddrinfo(res);
return false;
}
memcpy(addr, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
return true;
}
return false;
}
// FIXME: this does currently not handle links like:
// http://example.com/index.html#pos
bool SplitURI(const std::string& uri, std::string& host, std::string& file, int& port)
{
const char *p = uri.c_str();
const char *sl = strstr(p, "//");
unsigned int offs = 0;
if(sl)
{
offs = 7;
if(strncmp(p, "http://", offs))
return false;
p = sl + 2;
}
sl = strchr(p, '/');
if(!sl)
{
host = p;
file = "/";
}
else
{
host = uri.substr(offs, sl - p);
file = sl;
}
port = -1;
size_t colon = host.find(':');
if(colon != std::string::npos)
{
port = atoi(host.c_str() + colon);
host.erase(port);
}
return true;
}
static bool _SetNonBlocking(SOCKET s, bool nonblock)
{
if(!SOCKETVALID(s))
return false;
#ifdef _WIN32
ULONG tmp = !!nonblock;
if(::ioctlsocket(s, FIONBIO, &tmp) == SOCKET_ERROR)
return false;
#else
int tmp = ::fcntl(s, F_GETFL);
if(tmp < 0)
return false;
if(::fcntl(s, F_SETFL, nonblock ? (tmp|O_NONBLOCK) : (tmp|=~O_NONBLOCK)) < 0)
return false;
#endif
return true;
}
TcpSocket::TcpSocket()
: _s(INVALID_SOCKET), _inbuf(NULL), _inbufSize(0), _recvSize(0),
_readptr(NULL), _lastport(0)
{
}
TcpSocket::~TcpSocket()
{
close();
if(_inbuf)
free(_inbuf);
}
bool TcpSocket::isOpen(void)
{
return SOCKETVALID(_s);
}
void TcpSocket::close(void)
{
if(!SOCKETVALID(_s))
return;
_OnCloseInternal();
#ifdef _WIN32
::closesocket((SOCKET)_s);
#else
::close(_s);
#endif
_s = INVALID_SOCKET;
}
void TcpSocket::_OnCloseInternal()
{
_OnClose();
}
bool TcpSocket::SetNonBlocking(bool nonblock)
{
_nonblocking = nonblock;
return _SetNonBlocking(_s, nonblock);
}
void TcpSocket::SetBufsizeIn(unsigned int s)
{
if(s < 512)
s = 512;
if(s != _inbufSize)
_inbuf = (char*)realloc(_inbuf, s);
_inbufSize = s;
_writeSize = s - 1;
_readptr = _writeptr = _inbuf;
}
bool TcpSocket::open(const char *host /* = NULL */, unsigned int port /* = 0 */)
{
if(isOpen())
{
if( (host && host != _host) || (port && port != _lastport) )
close();
// ... and continue connecting to new host/port
else
return true; // still connected, to same host and port.
}
sockaddr_in addr;
if(host)
_host = host;
else
host = _host.c_str();
if(port)
_lastport = port;
else
{
port = _lastport;
if(!port)
return false;
}
if(!_Resolve(host, port, &addr))
{
traceprint("RESOLV ERROR: %s\n", _GetErrorStr(_GetError()).c_str());
return false;
}
SOCKET s = socket(AF_INET, SOCK_STREAM, 0);
if(!SOCKETVALID(s))
{
traceprint("SOCKET ERROR: %s\n", _GetErrorStr(_GetError()).c_str());
return false;
}
if (::connect(s, (sockaddr*)&addr, sizeof(sockaddr)))
{
traceprint("CONNECT ERROR: %s\n", _GetErrorStr(_GetError()).c_str());
return false;
}
_SetNonBlocking(s, _nonblocking); // restore setting if it was set in invalid state. static call because _s is intentionally still invalid here.
_s = s; // set the socket handle when we are really sure we are connected, and things are set up
_OnOpen();
return true;
}
bool TcpSocket::SendBytes(const char *str, unsigned int len)
{
if(!SOCKETVALID(_s))
return false;
//traceprint("SEND: '%s'\n", str);
return ::send(_s, str, len, 0) >= 0;
// TODO: check _GetError()
}
void TcpSocket::_ShiftBuffer(void)
{
size_t by = _readptr - _inbuf;
memmove(_inbuf, _readptr, by);
_readptr = _inbuf;
_writeptr = _inbuf + by;
_writeSize = _inbufSize - by - 1;
}
void TcpSocket::_OnData()
{
_OnRecv(_readptr, _recvSize);
}
bool TcpSocket::update(void)
{
if(!_OnUpdate())
return false;
if(!isOpen())
return false;
if(!_inbuf)
SetBufsizeIn(DEFAULT_BUFSIZE);
int bytes = recv(_s, _writeptr, _writeSize, 0); // last char is used as string terminator
if(bytes > 0) // we received something
{
_inbuf[bytes] = 0;
_recvSize = bytes;
// reset pointers for next read
_writeSize = _inbufSize - 1;
_readptr = _writeptr = _inbuf;
_OnData();
return true;
}
else if(bytes == 0) // remote has closed the connection
{
_recvSize = 0;
close();
return true;
}
else // whoops, error?
{
int e = _GetError();
switch(e)
{
case ECONNRESET:
case ENOTCONN:
case ETIMEDOUT:
#ifdef _WIN32
case WSAECONNABORTED:
case WSAESHUTDOWN:
#endif
close();
break;
case EWOULDBLOCK:
#if defined(EAGAIN) && (EWOULDBLOCK != EAGAIN)
case EAGAIN: // linux man pages say this can also happen instead of EWOULDBLOCK
#endif
return false;
}
traceprint("SOCKET UPDATE ERROR: (%d): %s\n", e, _GetErrorStr(e).c_str());
}
return true;
}
// ==========================
// ===== HTTP SPECIFIC ======
// ==========================
#ifdef MINIHTTP_SUPPORT_HTTP
static void strToLower(std::string& s)
{
std::transform(s.begin(), s.end(), s.begin(), tolower);
}
HttpSocket::HttpSocket()
: TcpSocket(),
_keep_alive(0), _remaining(0), _chunkedTransfer(false), _mustClose(true), _inProgress(false),
_followRedir(true), _alwaysHandle(false), _status(0)
{
}
HttpSocket::~HttpSocket()
{
}
void HttpSocket::_OnOpen()
{
TcpSocket::_OnOpen();
_chunkedTransfer = false;
}
void HttpSocket::_OnCloseInternal()
{
if(!IsRedirecting() || _alwaysHandle)
_OnClose();
}
bool HttpSocket::_OnUpdate()
{
if(!TcpSocket::_OnUpdate())
return false;
if(_inProgress && !_chunkedTransfer && !_remaining && _status)
_FinishRequest();
// initiate transfer if queue is not empty, but the socket somehow forgot to proceed
if(_requestQ.size() && !_remaining && !_chunkedTransfer && !_inProgress)
_DequeueMore();
return true;
}
bool HttpSocket::Download(const std::string& url, void *user /* = NULL */)
{
Request req;
req.user = user;
SplitURI(url, req.host, req.resource, req.port);
if(req.port < 0)
req.port = 80;
return SendGet(req, false);
}
bool HttpSocket::SendGet(const std::string what, void *user /* = NULL */)
{
Request req(what, _host, _lastport, user);
return SendGet(req, false);
}
bool HttpSocket::QueueGet(const std::string what, void *user /* = NULL */)
{
Request req(what, _host, _lastport, user);
return SendGet(req, true);
}
bool HttpSocket::SendGet(Request& req, bool enqueue)
{
if(req.host.empty() || !req.port)
return false;
std::stringstream r;
const char *crlf = "\r\n";
r << "GET " << req.resource << " HTTP/1.1" << crlf;
r << "Host: " << req.host << crlf;
if(_keep_alive)
{
r << "Connection: Keep-Alive" << crlf;
r << "Keep-Alive: " << _keep_alive << crlf;
}
else
r << "Connection: close" << crlf;
if(_user_agent.length())
r << "User-Agent: " << _user_agent << crlf;
if(_accept_encoding.length())
r << "Accept-Encoding: " << _accept_encoding << crlf;
r << crlf; // header terminator
req.header = r.str();
return _EnqueueOrSend(req, enqueue);
}
bool HttpSocket::_EnqueueOrSend(const Request& req, bool forceQueue /* = false */)
{
if(_inProgress || forceQueue) // do not send while receiving other data
{
traceprint("HTTP: Transfer pending; putting into queue. Now %u waiting.\n", (unsigned int)_requestQ.size()); // DEBUG
_requestQ.push(req);
return true;
}
// ok, we can send directly
if(!_OpenRequest(req))
return false;
_inProgress = SendBytes(req.header.c_str(), req.header.length());
return _inProgress;
}
// called whenever a request is finished completely and the socket checks for more things to send
void HttpSocket::_DequeueMore(void)
{
_FinishRequest(); // In case this was not done yet.
// _inProgress is known to be false here
if(_requestQ.size()) // still have other requests queued?
if(_EnqueueOrSend(_requestQ.front(), false)) // could we send?
_requestQ.pop(); // if so, we are done with this request
// otherwise, we are done for now. socket is kept alive for future sends. Nothing to do.
}
bool HttpSocket::_OpenRequest(const Request& req)
{
if(_inProgress)
{
traceprint("HttpSocket::_OpenRequest(): _inProgress == true, should not be called.");
return false;
}
if(!open(req.host.c_str(), req.port))
return false;
_inProgress = true;
_curRequest = req;
_status = 0;
return true;
}
void HttpSocket::_FinishRequest(void)
{
if(_inProgress)
{
if(!IsRedirecting() || _alwaysHandle)
_OnRequestDone(); // notify about finished request
_inProgress = false;
_hdrs.clear();
}
}
void HttpSocket::_ProcessChunk(void)
{
if(!_chunkedTransfer)
return;
unsigned int chunksize = -1;
while(true)
{
// less data required until chunk end than received, means the new chunk starts somewhere in the middle
// of the received data block. finish this chunk first.
if(_remaining)
{
if(_remaining <= _recvSize) // it contains the rest of the chunk, including CRLF
{
_OnRecvInternal(_readptr, _remaining - 2); // implicitly skip CRLF
_readptr += _remaining;
_recvSize -= _remaining;
_remaining = 0; // done with this one.
if(!chunksize) // and if chunksize was 0, we are done with all chunks.
break;
}
else // buffer did not yet arrive completely
{
_OnRecvInternal(_readptr, _recvSize);
_remaining -= _recvSize;
_recvSize = 0; // done with the whole buffer, but not with the chunk
return; // nothing else to do here
}
}
// each chunk identifier ends with CRLF.
// if we don't find that, we hit the corner case that the chunk identifier was not fully received.
// in that case, adjust the buffer and wait for the rest of the data to be appended
char *term = strstr(_readptr, "\r\n");
if(!term)
{
if(_recvSize) // if there is still something queued, move it to the left of the buffer and append on next read
_ShiftBuffer();
return;
}
term += 2; // skip CRLF
// when we are here, the (next) chunk header was completely received.
chunksize = strtoul(_readptr, NULL, 16);
_remaining = chunksize + 2; // the http protocol specifies that each chunk has a trailing CRLF
_recvSize -= (term - _readptr);
_readptr = term;
}
if(!chunksize) // this was the last chunk, no further data expected unless requested
{
_chunkedTransfer = false;
_DequeueMore();
if(_recvSize)
traceprint("_ProcessChunk: There are %u bytes left in the buffer, huh?\n", _recvSize);
if(_mustClose)
close();
}
}
void HttpSocket::_ParseHeaderFields(const char *s, size_t size)
{
// Field: Entry data\r\n
const char *maxs = s + size;
const char *colon, *entry;
const char *entryEnd = s; // last char of entry data
while(s < maxs)
{
while(isspace(*s))
{
++s;
if(s >= maxs)
return;
}
colon = strchr(s, ':');
if(!colon)
return;
entryEnd = strchr(colon, '\n');
if(!entryEnd)
return;
while(entryEnd[-1] == '\n' || entryEnd[-1] == '\r')
--entryEnd;
entry = colon + 1;
while(isspace(*entry))
{
++entry;
if(entry > entryEnd) // Field, but no entry? (Field: \n\r)
{
s = entryEnd;
continue;
}
}
std::string field(s, colon - s);
strToLower(field);
_hdrs[field] = std::string(entry, entryEnd - entry);
s = entryEnd;
}
}
const char *HttpSocket::Hdr(const char *h) const
{
std::map<std::string, std::string>::const_iterator it = _hdrs.find(h);
return it == _hdrs.end() ? NULL : it->second.c_str();
}
static int safeatoi(const char *s)
{
return s ? atoi(s) : 0;
}
bool HttpSocket::_HandleStatus()
{
_remaining = _contentLen = safeatoi(Hdr("content-length"));
const char *encoding = Hdr("transfer-encoding");
_chunkedTransfer = encoding && !STRNICMP(encoding, "chunked", 7);
const char *conn = Hdr("connection"); // if its not keep-alive, server will close it, so we can too
_mustClose = !conn || STRNICMP(conn, "keep-alive", 10);
if(!(_chunkedTransfer || _contentLen) && _status == 200)
traceprint("_ParseHeader: Not chunked transfer and content-length==0, this will go fail");
switch(_status)
{
case 200:
return true;
case 301:
case 302:
case 303:
case 307:
case 308:
if(_followRedir)
if(const char *loc = Hdr("location"))
{
traceprint("Following HTTP redirect to: %s\n", loc);
Download(loc, _curRequest.user);
}
return false;
default:
return false;
}
}
bool HttpSocket::IsRedirecting() const
{
switch(_status)
{
case 301:
case 302:
case 303:
case 307:
case 308:
return true;
}
return false;
}
void HttpSocket::_ParseHeader(void)
{
_tmpHdr += _inbuf;
const char *hptr = _tmpHdr.c_str();
if((_recvSize >= 5 || _tmpHdr.size() >= 5) && memcmp("HTTP/", hptr, 5))
{
traceprint("_ParseHeader: not HTTP stream\n");
return;
}
const char *hdrend = strstr(hptr, "\r\n\r\n");
if(!hdrend)
{
traceprint("_ParseHeader: could not find end-of-header marker, or incomplete buf; delaying.\n");
return;
}
//traceprint(hptr);
hptr = strchr(hptr + 5, ' '); // skip "HTTP/", already known
if(!hptr)
return; // WTF?
++hptr; // number behind first space is the status code
_status = atoi(hptr);
// Default values
_chunkedTransfer = false;
_contentLen = 0; // yet unknown
hptr = strstr(hptr, "\r\n");
_ParseHeaderFields(hptr + 2, hdrend - hptr);
// FIXME: return value indicates success.
// Bail out on non-success, or at least make it so that _OnRecv() is not called.
// (Unless an override bool is given that even non-successful answers get their data delivered!)
_HandleStatus();
// get ready
_readptr = strstr(_inbuf, "\r\n\r\n") + 4; // skip double newline. must have been found in hptr earlier.
_recvSize -= (_readptr - _inbuf); // skip the header part
_tmpHdr.clear();
}
// generic http header parsing
void HttpSocket::_OnData(void)
{
if(!(_chunkedTransfer || (_remaining && _recvSize)))
_ParseHeader();
if(_chunkedTransfer)
{
_ProcessChunk(); // first, try to finish one or more chunks
}
else if(_remaining && _recvSize) // something remaining? if so, we got a header earlier, but not all data
{
_remaining -= _recvSize;
_OnRecvInternal(_readptr, _recvSize);
if(int(_remaining) < 0)
{
traceprint("_OnRecv: _remaining wrap-around, huh??\n");
_remaining = 0;
}
if(!_remaining) // received last block?
{
if(_mustClose)
close();
else
_DequeueMore();
}
// nothing else to do here.
}
// otherwise, the server sent just the header, with the data following in the next packet
}
void HttpSocket::_OnClose()
{
if(!ExpectMoreData())
_FinishRequest();
}
void HttpSocket::_OnRecvInternal(char *buf, unsigned int size)
{
if(_status == 200 || _alwaysHandle)
_OnRecv(buf, size);
}
#endif
// ===========================
// ===== SOCKET SET ==========
// ===========================
#ifdef MINIHTTP_SUPPORT_SOCKET_SET
SocketSet::~SocketSet()
{
deleteAll();
}
void SocketSet::deleteAll(void)
{
for(Store::iterator it = _store.begin(); it != _store.end(); ++it)
delete it->first;
_store.clear();
}
bool SocketSet::update(void)
{
bool interesting = false;
Store::iterator it = _store.begin();
for( ; it != _store.end(); )
{
TcpSocket *sock = it->first;
SocketSetData& sdata = it->second;
interesting = sock->update() || interesting;
if(sdata.deleteWhenDone && !sock->isOpen() && !sock->HasPendingTask())
{
delete sock;
_store.erase(it++);
}
else
++it;
}
return interesting;
}
void SocketSet::remove(TcpSocket *s)
{
_store.erase(s);
}
void SocketSet::add(TcpSocket *s, bool deleteWhenDone /* = true */)
{
s->SetNonBlocking(true);
SocketSetData sdata;
sdata.deleteWhenDone = deleteWhenDone;
_store[s] = sdata;
}
#endif
} // namespace minihttp
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