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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
#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
# include <io.h>
#else
# include <sys/types.h>
# include <unistd.h>
# include <fcntl.h>
# include <sys/socket.h>
# include <netinet/in.h>
# include <netdb.h>
# define SOCKET_ERROR (-1)
# define INVALID_SOCKET (SOCKET)(~0)
typedef intptr_t SOCKET;
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sstream>
#include <cctype>
#include <cerrno>
#include <algorithm>
#include <assert.h>
#ifdef MINIHTTP_USE_MBEDTLS
# include <mbedtls/net.h>
# include <mbedtls/ssl.h>
# include <mbedtls/entropy.h>
# include <mbedtls/ctr_drbg.h>
#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 {
#ifdef MINIHTTP_USE_MBEDTLS
// ------------------------ SSL STUFF -------------------------
bool HasSSL()
{
// compile time assertion that mbedtls_net_context really is just an int
switch(0) { case 0:; case (sizeof(mbedtls_net_context) == sizeof(int)):; }
return true;
}
void traceprint_ssl(void *ctx, int level, const char *file, int line, const char *str )
{
(void)ctx;
printf("ssl(%s:%04d) [%d] %s\n", file, line, level, str);
}
struct SSLCtx
{
SSLCtx()
{
mbedtls_entropy_init(&entropy);
mbedtls_x509_crt_init(&cacert);
mbedtls_ssl_init(&ssl);
mbedtls_ctr_drbg_init(&ctr_drbg);
mbedtls_ssl_config_init(&conf);
}
~SSLCtx()
{
mbedtls_entropy_free(&entropy);
mbedtls_x509_crt_free(&cacert);
mbedtls_ssl_free(&ssl);
mbedtls_ctr_drbg_free(&ctr_drbg);
mbedtls_ssl_config_free(&conf);
}
bool init()
{
const char *pers = "minihttp";
const size_t perslen = strlen(pers);
int err = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *)pers, perslen);
if(err)
{
traceprint("SSLCtx::init(): mbedtls_ctr_drbg_seed() returned %d\n", err);
return false;
}
err = mbedtls_ssl_config_defaults(&conf,
MBEDTLS_SSL_IS_CLIENT,
MBEDTLS_SSL_TRANSPORT_STREAM,
MBEDTLS_SSL_PRESET_DEFAULT);
if(err)
{
traceprint("SSLCtx::init(): mbedtls_ssl_config_defaults() returned %d\n", err);
return false;
}
mbedtls_ssl_conf_authmode(&conf, MBEDTLS_SSL_VERIFY_OPTIONAL);
mbedtls_ssl_conf_ca_chain(&conf, &cacert, NULL);
/* SSLv3 is deprecated, set minimum to TLS 1.0 */
mbedtls_ssl_conf_min_version(&conf, MBEDTLS_SSL_MAJOR_VERSION_3, MBEDTLS_SSL_MINOR_VERSION_1);
mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);
mbedtls_ssl_conf_dbg(&conf, traceprint_ssl, NULL);
err = mbedtls_ssl_setup(&ssl, &conf);
if(err)
{
traceprint("SSLCtx::init(): mbedtls_ssl_init() returned %d\n", err);
return false;
}
return true;
}
void reset()
{
mbedtls_ssl_session_reset(&ssl);
}
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_ssl_context ssl;
mbedtls_x509_crt cacert;
mbedtls_ssl_config conf;
};
// ------------------------------------------------------------
#else// MINIHTTP_USE_MBEDTLS
bool HasSSL() { return false; }
#endif
#define DEFAULT_BUFSIZE 4096
inline int _GetError()
{
#ifdef _WIN32
return WSAGetLastError();
#else
return errno;
#endif
}
inline std::string _GetErrorStr(int e)
{
std::string ret;
#ifdef _WIN32
LPTSTR s;
::FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, NULL, e, 0, (LPTSTR)&s, 0, NULL);
if(s)
ret = s;
::LocalFree(s);
#else
const char *s = strerror(e);
if(s)
ret = s;
#endif
return ret;
}
static bool _networkInitDone = false;
bool InitNetwork()
{
#ifdef _WIN32
WSADATA wsadata;
if(WSAStartup(MAKEWORD(2,2), &wsadata))
{
traceprint("WSAStartup ERROR: %s", _GetErrorStr(_GetError()).c_str());
return false;
}
#endif
_networkInitDone = true;
return true;
}
void StopNetwork()
{
#ifdef _WIN32
WSACleanup();
#endif
_networkInitDone = false;
}
static bool _Resolve(const char *host, unsigned int port, struct sockaddr_in *addr)
{
char port_str[16];
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& protocol, std::string& host, std::string& file, int& port, bool& useSSL)
{
const char *p = uri.c_str();
const char *sl = strstr(p, "//");
unsigned int offs = 0;
port = -1;
bool ssl = false;
if(sl)
{
size_t colon = uri.find(':');
size_t firstslash = uri.find('/');
if(colon < firstslash)
protocol = uri.substr(0, colon);
if(strncmp(p, "http://", 7) == 0)
{
offs = 7;
port = 80;
}
else if(strncmp(p, "https://", 8) == 0)
{
offs = 8;
port = 443;
ssl = true;
}
else
return false;
p = sl + 2;
}
sl = strchr(p, '/');
if(!sl)
{
host = p;
file = "/";
}
else
{
host = uri.substr(offs, sl - p);
file = sl;
}
size_t colon = host.find(':');
if(colon != std::string::npos)
{
port = atoi(host.c_str() + colon);
host.erase(colon);
}
useSSL = ssl;
return true;
}
void URLEncode(const std::string& s, std::string& enc)
{
const size_t len = s.length();
char buf[3];
buf[0] = '%';
for(size_t i = 0; i < len; i++)
{
const unsigned char c = s[i];
// from https://www.ietf.org/rfc/rfc1738.txt, page 3
// with some changes for compatibility
if(isalnum(c) || c == '-' || c == '_' || c == '.' || c == ',')
enc += (char)c;
else if(c == ' ')
enc += '+';
else
{
unsigned nib = (c >> 4) & 0xf;
buf[1] = nib < 10 ? '0' + nib : 'a' + (nib-10);
nib = c & 0xf;
buf[2] = nib < 10 ? '0' + nib : 'a' + (nib-10);
enc.append(&buf[0], 3);
}
}
}
static bool _SetNonBlocking(SOCKET s, bool nonblock)
{
if(!SOCKETVALID(s))
return false;
#ifdef MINIHTTP_USE_MBEDTLS
if(nonblock)
return mbedtls_net_set_nonblock((mbedtls_net_context*)&s) == 0; // this horrible hackery is okay as long as the compile assert in HasSSL() holds
else
return mbedtls_net_set_block((mbedtls_net_context*)&s) == 0;
#elif defined(_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()
: _inbuf(NULL)
, _readptr(NULL)
, _inbufSize(0)
, _recvSize(0)
, _lastport(0)
, _s(INVALID_SOCKET)
, _sslctx(NULL)
{
#ifdef MINIHTTP_USE_MBEDTLS
mbedtls_net_init((mbedtls_net_context*)&_s);
#endif
}
TcpSocket::~TcpSocket()
{
close();
if(_inbuf)
free(_inbuf);
}
bool TcpSocket::isOpen(void)
{
return SOCKETVALID(_s);
}
void TcpSocket::close(void)
{
if(!SOCKETVALID(_s))
return;
traceprint("TcpSocket::close\n");
_OnCloseInternal();
#ifdef MINIHTTP_USE_MBEDTLS
if(_sslctx)
((SSLCtx*)_sslctx)->reset();
mbedtls_net_free((mbedtls_net_context*)&_s);
shutdownSSL();
#else
# ifdef _WIN32
::closesocket((SOCKET)_s);
# else
::close(_s);
# endif
#endif
_s = INVALID_SOCKET;
_recvSize = 0;
}
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;
}
static bool _openSocket(SOCKET *ps, const char *host, unsigned port)
{
#ifdef MINIHTTP_USE_MBEDTLS
int s;
char portstr[16];
sprintf(portstr, "%d", port);
int err = mbedtls_net_connect((mbedtls_net_context*)&s, host, portstr, MBEDTLS_NET_PROTO_TCP);
if(err)
{
traceprint("open_ssl: net_connect(%s, %u) returned %d\n", host, port, err);
return false;
}
#else
sockaddr_in addr;
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;
}
#endif
*ps = s;
return true;
}
#ifdef MINIHTTP_USE_MBEDTLS
static bool _openSSL(void *ps, SSLCtx *ctx)
{
mbedtls_ssl_set_bio(&ctx->ssl, (mbedtls_net_context*)ps, mbedtls_net_send, mbedtls_net_recv, NULL);
traceprint("SSL handshake now...\n");
int err;
while( (err = mbedtls_ssl_handshake(&ctx->ssl)) )
{
if(err != MBEDTLS_ERR_SSL_WANT_READ && err != MBEDTLS_ERR_SSL_WANT_WRITE)
{
traceprint("open_ssl: ssl_handshake returned -0x%x\n\n", -err);
return false;
}
}
traceprint("SSL handshake done\n");
return true;
}
#endif
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.
}
if(host)
_host = host;
else
host = _host.c_str();
if(port)
_lastport = port;
else
{
port = _lastport;
if(!port)
return false;
}
traceprint("TcpSocket::open(): host = [%s], port = %d\n", host, port);
assert(!SOCKETVALID(_s));
_recvSize = 0;
{
SOCKET s;
if(!_openSocket(&s, host, port))
return false;
_s = s;
#ifdef SO_NOSIGPIPE
// Don't fire SIGPIPE when trying to write to a closed socket
{
int set = 1;
setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, (void *)&set, sizeof(int));
}
#endif
}
_SetNonBlocking(_s, _nonblocking); // restore setting if it was set in invalid state. static call because _s is intentionally still invalid here.
#ifdef MINIHTTP_USE_MBEDTLS
if(_sslctx)
{
traceprint("TcpSocket::open(): SSL requested...\n");
if(!_openSSL(&_s, (SSLCtx*)_sslctx))
{
close();
return false;
}
}
#endif
_OnOpen();
return true;
}
#ifdef MINIHTTP_USE_MBEDTLS
void TcpSocket::shutdownSSL()
{
delete ((SSLCtx*)_sslctx);
_sslctx = NULL;
}
bool TcpSocket::initSSL(const char *certs)
{
SSLCtx *ctx = (SSLCtx*)_sslctx;
if(ctx)
ctx->reset();
else
{
ctx = new SSLCtx();
_sslctx = ctx;
if(!ctx->init())
{
shutdownSSL();
return false;
}
}
if(certs)
{
int err = mbedtls_x509_crt_parse(&ctx->cacert, (const unsigned char*)certs, strlen(certs));
if(err)
{
shutdownSSL();
traceprint("x509_crt_parse() returned %d\n", err);
return false;
}
}
return true;
}
SSLResult TcpSocket::verifySSL(char *buf, unsigned bufsize)
{
if(!_sslctx)
return SSLR_NO_SSL;
SSLCtx *ctx = (SSLCtx*)_sslctx;
unsigned r = SSLR_OK;
int res = mbedtls_ssl_get_verify_result(&ctx->ssl);
if(res)
{
if(res & MBEDTLS_X509_BADCERT_EXPIRED)
r |= SSLR_CERT_EXPIRED;
if(res & MBEDTLS_X509_BADCERT_REVOKED)
r |= SSLR_CERT_REVOKED;
if(res & MBEDTLS_X509_BADCERT_CN_MISMATCH)
r |= SSLR_CERT_CN_MISMATCH;
if(res & MBEDTLS_X509_BADCERT_NOT_TRUSTED)
r |= SSLR_CERT_NOT_TRUSTED;
if(res & MBEDTLS_X509_BADCERT_MISSING)
r |= SSLR_CERT_MISSING;
if(res & MBEDTLS_X509_BADCERT_SKIP_VERIFY)
r |= SSLR_CERT_SKIP_VERIFY;
if(res & MBEDTLS_X509_BADCERT_FUTURE)
r |= SSLR_CERT_FUTURE;
// More than just this?
if(res & (MBEDTLS_X509_BADCERT_SKIP_VERIFY | MBEDTLS_X509_BADCERT_NOT_TRUSTED))
r |= SSLR_FAIL;
}
if(buf && bufsize)
mbedtls_x509_crt_verify_info(buf, bufsize, "", res);
return (SSLResult)r;
}
#else // MINIHTTP_USE_MBEDTLS
void TcpSocket::shutdownSSL() {}
bool TcpSocket::initSSL(const char *certs)
{
traceprint("initSSL: Compiled without SSL support!\n");
return false;
}
SSLResult TcpSocket::verifySSL(char *buf, unsigned buflen) { return SSLR_NO_SSL; }
#endif
bool TcpSocket::SendBytes(const void *str, unsigned int len)
{
if(!len)
return true;
if(!SOCKETVALID(_s))
return false;
//traceprint("SEND: '%s'\n", str);
unsigned written = 0;
while(true) // FIXME: buffer bytes to an internal queue instead?
{
int ret = _writeBytes((const unsigned char*)str + written, len - written);
if(ret > 0)
{
assert((unsigned)ret <= len);
written += (unsigned)ret;
if(written >= len)
break;
}
else if(ret < 0)
{
int err = ret == -1 ? _GetError() : ret;
traceprint("SendBytes: error %d: %s\n", err, _GetErrorStr(err).c_str());
close();
return false;
}
// and if ret == 0, keep trying.
}
assert(written == len);
return true;
}
int TcpSocket::_writeBytes(const unsigned char *buf, size_t len)
{
int ret = 0;
#ifdef MINIHTTP_USE_MBEDTLS
int err;
if(_sslctx)
err = mbedtls_ssl_write(&((SSLCtx*)_sslctx)->ssl, buf, len);
else
err = mbedtls_net_send(&_s, buf, len);
switch(err)
{
case MBEDTLS_ERR_SSL_WANT_WRITE:
ret = 0; // FIXME: Nothing written, try later?
default:
ret = err;
}
#else
int flags = 0;
#ifdef MSG_NOSIGNAL
flags |= MSG_NOSIGNAL;
#endif
return ::send(_s, (const char*)buf, len, flags);
#endif
return ret;
}
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);
}
int TcpSocket::_readBytes(unsigned char *buf, size_t maxlen)
{
#ifdef MINIHTTP_USE_MBEDTLS
if(_sslctx)
return mbedtls_ssl_read(&((SSLCtx*)_sslctx)->ssl, buf, maxlen);
else
return mbedtls_net_recv(&_s, buf, maxlen);
#else
return recv(_s, (char*)buf, maxlen, 0); // last char is used as string terminator
#endif
}
bool TcpSocket::update(void)
{
if(!_OnUpdate())
return false;
if(!isOpen())
return false;
if(!_inbuf)
SetBufsizeIn(DEFAULT_BUFSIZE);
int bytes = _readBytes((unsigned char*)_writeptr, _writeSize);
//traceprint("TcpSocket::update: _readBytes() result %d\n", bytes);
if(bytes > 0) // we received something
{
_inbuf[bytes] = 0;
_recvSize = bytes;
// reset pointers for next read
_writeSize = _inbufSize - 1;
_readptr = _writeptr = _inbuf;
_OnData();
}
else if(bytes == 0) // remote has closed the connection
{
close();
}
else // whoops, error?
{
// Possible that the error is returned directly (in that case, < -1, or -1 is returned and the error has to be retrieved seperately.
// But in the latter case, error numbers may be positive (at least on windows...)
int err = bytes == -1 ? _GetError() : bytes;
switch(err)
{
case EWOULDBLOCK:
#if defined(EAGAIN) && (EWOULDBLOCK != EAGAIN)
case EAGAIN: // linux man pages say this can also happen instead of EWOULDBLOCK
#endif
return false;
#ifdef MINIHTTP_USE_MBEDTLS
case MBEDTLS_ERR_SSL_WANT_READ:
break; // Try again later
#endif
default:
traceprint("SOCKET UPDATE ERROR: (%d): %s\n", err, _GetErrorStr(err).c_str());
case ECONNRESET:
case ENOTCONN:
case ETIMEDOUT:
#ifdef _WIN32
case WSAECONNABORTED:
case WSAESHUTDOWN:
#endif
close();
break;
}
}
return true;
}
// ==========================
// ===== HTTP SPECIFIC ======
// ==========================
#ifdef MINIHTTP_SUPPORT_HTTP
static void strToLower(std::string& s)
{
std::transform(s.begin(), s.end(), s.begin(), tolower);
}
POST& POST::add(const char *key, const char *value)
{
if(!empty())
data += '&';
URLEncode(key, data);
data += '=';
URLEncode(value, data);
return *this;
}
HttpSocket::HttpSocket()
: TcpSocket()
, _keep_alive(0)
, _remaining(0)
, _status(0)
, _inProgress(false)
, _chunkedTransfer(false)
, _mustClose(true)
, _followRedir(true)
, _alwaysHandle(false)
{
}
HttpSocket::~HttpSocket()
{
}
void HttpSocket::_OnOpen()
{
TcpSocket::_OnOpen();
_chunkedTransfer = false;
_mustClose = true;
}
void HttpSocket::_OnCloseInternal()
{
if(!IsRedirecting() || _alwaysHandle)
_OnClose();
}
bool HttpSocket::_OnUpdate()
{
if(!TcpSocket::_OnUpdate())
return false;
if(_inProgress && !_chunkedTransfer && !_remaining && _status)
_FinishRequest();
//traceprint("HttpSocket::_OnUpdate, Q = %d\n", (unsigned)_requestQ.size());
// 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, const char *extraRequest /*= NULL*/, void *user /* = NULL */, const POST *post /*= NULL*/)
{
Request req;
req.user = user;
if(post)
req.post = *post;
SplitURI(url, req.protocol, req.host, req.resource, req.port, req.useSSL);
if(IsRedirecting() && req.host.empty()) // if we're following a redirection to the same host, the server is likely to omit its hostname
req.host = _curRequest.host;
if(req.port < 0)
req.port = 80;
if(extraRequest)
req.extraGetHeaders = extraRequest;
return SendRequest(req, false);
}
bool HttpSocket::_Redirect(std::string loc, bool forceGET)
{
traceprint("Following HTTP redirect to: %s\n", loc.c_str());
if(loc.empty())
return false;
Request req;
req.user = _curRequest.user;
req.useSSL = _curRequest.useSSL;
if(!forceGET)
req.post = _curRequest.post;
SplitURI(loc, req.protocol, req.host, req.resource, req.port, req.useSSL);
if(req.protocol.empty()) // assume local resource
{
req.host = _curRequest.host;
req.resource = loc;
}
if(req.host.empty())
req.host = _curRequest.host;
if(req.port < 0)
req.port = _curRequest.port;
req.extraGetHeaders = _curRequest.extraGetHeaders;
return SendRequest(req, false);
}
bool HttpSocket::SendRequest(const std::string what, const char *extraRequest /*= NULL*/, void *user /* = NULL */)
{
Request req(what, _host, _lastport, user);
if(extraRequest)
req.extraGetHeaders = extraRequest;
return SendRequest(req, false);
}
bool HttpSocket::QueueRequest(const std::string what, const char *extraRequest /*= NULL*/, void *user /* = NULL */)
{
Request req(what, _host, _lastport, user);
if(extraRequest)
req.extraGetHeaders = extraRequest;
return SendRequest(req, true);
}
bool HttpSocket::SendRequest(Request& req, bool enqueue)
{
if(req.host.empty() || !req.port)
return false;
const bool post = !req.post.empty();
std::stringstream r;
const char *crlf = "\r\n";
r << (post ? "POST " : "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;
if(post)
{
r << "Content-Length: " << req.post.length() << crlf;
r << "Content-Type: application/x-www-form-urlencoded" << crlf;
}
if(req.extraGetHeaders.length())
{
r << req.extraGetHeaders;
if(req.extraGetHeaders.compare(req.extraGetHeaders.length() - 2, std::string::npos, crlf))
r << crlf;
}
r << crlf; // header terminator
// FIXME: appending this to the 'header' field is probably not a good idea
if(post)
r << req.post.str();
req.header = r.str();
return _EnqueueOrSend(req, enqueue);
}
bool HttpSocket::_EnqueueOrSend(const Request& req, bool forceQueue /* = false */)
{
traceprint("HttpSocket::_EnqueueOrSend, forceQueue = %d\n", forceQueue);
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());
_requestQ.push(req);
return true;
}
// ok, we can send directly
traceprint("HTTP: Open request for immediate send.\n");
if(!_OpenRequest(req))
return false;
bool sent = SendBytes(req.header.c_str(), req.header.length());
_inProgress = sent;
return sent;
}
// called whenever a request is finished completely and the socket checks for more things to send
void HttpSocket::_DequeueMore(void)
{
traceprint("HttpSocket::_DequeueMore, Q = %u\n", (unsigned)_requestQ.size());
_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(req.useSSL && !hasSSL())
{
traceprint("HttpSocket::_OpenRequest(): Is an SSL connection, but SSL was not inited, doing that now\n");
if(!initSSL(NULL)) // FIXME: supply cert list?
{
traceprint("FAILED to init SSL\n");
return false;
}
}
if(!open(req.host.c_str(), req.port))
return false;
_inProgress = true;
_curRequest = req;
_status = 0;
return true;
}
void HttpSocket::_FinishRequest(void)
{
traceprint("HttpSocket::_FinishRequest\n");
if(_inProgress)
{
traceprint("... in progress. redirecting = %d\n", IsRedirecting());
if(!IsRedirecting() || _alwaysHandle)
_OnRequestDone(); // notify about finished request
_inProgress = false;
_hdrs.clear();
if(_mustClose)
close();
}
}
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)
{
// Key: Value data\r\n
const char * const maxs = s + size;
while(s < maxs)
{
while(isspace(*s))
{
++s;
if(s >= maxs)
return;
}
const char * const colon = strchr(s, ':');
if(!colon)
return;
const char *valEnd = strchr(colon, '\n'); // last char of val data
if(!valEnd)
return;
while(valEnd[-1] == '\n' || valEnd[-1] == '\r') // skip backwards if necessary
--valEnd;
const char *val = colon + 1; // value starts after ':' ...
while(isspace(*val) && val < valEnd) // skip spaces after the colon
++val;
std::string key(s, colon - s);
strToLower(key);
std::string valstr(val, valEnd - val);
_hdrs[key] = valstr;
traceprint("HDR: %s: %s\n", key.c_str(), valstr.c_str());
s = valEnd;
}
}
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);
// As per the spec, we also need to handle 1xx codes, but are free to ignore them
const bool success = IsSuccess() || (_status >= 100 && _status <= 199);
if(!(_chunkedTransfer || _contentLen) && success)
traceprint("_ParseHeader: Not chunked transfer and content-length==0, this will go fail\n");
traceprint("Got HTTP Status %d\n", _status);
if(success)
return true;
bool forceGET = false;
switch(_status)
{
case 303:
forceGET = true; // As per spec, continue with a GET request
case 301:
case 302:
case 307:
case 308:
if(_followRedir)
if(const char *loc = Hdr("location"))
_Redirect(loc, forceGET);
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;
}
bool HttpSocket::IsSuccess() const
{
const unsigned s = _status;
return s >= 200 && s <= 205;
}
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(void *buf, unsigned int size)
{
if(IsSuccess() || _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())
{
traceprint("Delete socket\n");
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
// ---------------------------------------------------
// Simple one-shot API
class DLSocket : public HttpSocket
{
public:
DLSocket() : buf(NULL), bufsz(0), bufcap(0), finished(false), fail(false)
{
}
virtual ~DLSocket() {}
char *buf;
size_t bufsz;
size_t bufcap;
bool finished;
bool fail;
protected:
void _OnRequestDone()
{
finished = true;
if(buf)
buf[bufsz] = 0; // zero-terminate
}
void _OnRecv(void *incoming, unsigned size)
{
if(!size || !IsSuccess())
return;
if(bufcap + size + 1 >= bufsz) // always make sure there's 1 more byte free for the zero-terminator
{
bufcap += (bufcap / 2) + size + 1;
buf = (char*)realloc(buf, bufcap);
if(!buf)
{
fail = true;
close();
}
}
memcpy(buf + bufsz, incoming, size);
bufsz += size;
}
};
char *Download(const char *url, size_t *sz, const POST *post /* = NULL */)
{
if(!_networkInitDone)
if(!InitNetwork())
return NULL;
DLSocket dl;
dl.SetBufsizeIn(64 * 1024);
dl.SetNonBlocking(false);
dl.SetFollowRedirect(true);
dl.SetAlwaysHandle(false);
dl.SetUserAgent("minihttp");
dl.Download(url, NULL, NULL, post);
while(dl.isOpen() || dl.HasPendingTask())
dl.update();
if(!dl.finished || dl.fail)
{
free(dl.buf);
return NULL;
}
if(sz)
*sz = dl.bufsz;
// FIXME: if the body is empty (aka the HTTP reply contained entirely of headers only), buf was not allocated and is still NULL.
// Might want to return 1 malloc'd zero byte in that case?
return dl.buf;
}
} // namespace minihttp
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