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cnq3/code/client/cl_download.cpp

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/*
===========================================================================
Copyright (C) 2017-2020 Gian 'myT' Schellenbaum
This file is part of Challenge Quake 3 (CNQ3).
Challenge Quake 3 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.
Challenge Quake 3 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 Challenge Quake 3. If not, see <https://www.gnu.org/licenses/>.
===========================================================================
*/
// fast asynchronous HTTP .pk3 file downloads for missing maps
#include "client.h"
#include <stdio.h>
#include <stdarg.h>
#if defined(_WIN32)
#include <io.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#if defined(_WIN32)
#include <winsock2.h>
#include <Windows.h>
#include <ws2tcpip.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <unistd.h>
#include <fcntl.h>
#include <netdb.h>
#include <string.h>
#endif
#if defined(_WIN32)
typedef ADDRINFOA addrInfo_t;
#define Q_closesocket closesocket
#define Q_unlink _unlink
#else
typedef addrinfo addrInfo_t;
typedef int SOCKET;
#define INVALID_SOCKET (-1)
#define SOCKET_ERROR (-1)
#define MAX_PATH (256)
#define Q_closesocket close
#define Q_unlink unlink
#endif
#define MAX_TIMEOUT_MS 2000
static const char sockaddr_in_large_enough[sizeof(sockaddr_in) >= sizeof(sockaddr) ? 1 : -1] = { 0 };
struct mapDownload_t {
char recBuffer[1 << 20]; // for both download data and checksumming
char tempMessage[MAXPRINTMSG]; // for PrintError
char tempMessage2[MAXPRINTMSG]; // for PrintSocketError
char errorMessage[MAXPRINTMSG];
char query[512]; // HTTP GET query - e.g. "map?n=akumacpm1a" for the CNQ3 map server
char mapName[MAX_PATH]; // only used if the server doesn't give us a .pk3 name
char tempPath[MAX_PATH]; // full path of the temp file being written to
char finalName[MAX_PATH]; // file name with extension suggested by the server
char finalPath[MAX_PATH]; // full path of the new .pk3 file
sockaddr_in addresses[16]; // addresses to try to connect to
char httpHeaderValue[128]; // only set when BadResponse is qtrue
SOCKET socket;
FILE* file;
int addressIndex;
int addressCount;
int startTimeMS;
unsigned int bytesHeader; // header only
unsigned int bytesContent; // file content only
unsigned int bytesTotal; // message header + file content
unsigned int bytesDownloaded; // total downloaded, including the header
unsigned int crc32;
qbool fromCommand; // qtrue if started by a console command
qbool headerParsed; // qtrue if we're done parsing the header
qbool badResponse; // qtrue if we need to read more packets for the custom error message
int timeOutStartTimeMS; // when the connect/recv timeout started
qbool lastErrorTimeOut; // qtrue if the last recv error was a timeout
int sourceIndex; // index into the cl_mapDLSources array
qbool exactMatch; // qtrue if an exact match is required
qbool cleared; // qtrue if Download_Clear was called at least once
qbool realMapName; // qtrue if the name of a .bsp - otherwise, might be invalid or auto-generated
qbool connecting; // qtrue if the work started by connect is still in progress
};
enum mapDownloadStatus_t {
MDLS_NOTHING,
MDLS_ERROR, // just finished unsuccessfully
MDLS_SUCCESS, // just finished successfully
MDLS_IN_PROGRESS,
MDLS_COUNT
};
typedef void (*mapdlQueryFormatter_t)( char* query, int querySize, const char* mapName );
// map download source for queries by map name only
struct mapDownloadSource_t {
const char* name;
const char* hostName; // don't put in the scheme (e.g. "http://")
const char* numericHostName; // used as a fallback
int port;
mapdlQueryFormatter_t formatQuery;
};
static mapDownload_t cl_mapDL;
static void FormatQueryCNQ3( char* query, int querySize, const char* mapName );
static void FormatQueryWS( char* query, int querySize, const char* mapName );
static const mapDownloadSource_t cl_mapDLSources[2] = {
{ "CNQ3", "maps.playmorepromode.com", "95.179.180.168", 8000, &FormatQueryCNQ3 },
{ "WorldSpawn", "ws.q3df.org", "176.9.111.74", 80, &FormatQueryWS }
};
static void FormatQueryCNQ3( char* query, int querySize, const char* mapName )
{
Com_sprintf(query, querySize, "map?n=%s", mapName);
}
static void FormatQueryWS( char* query, int querySize, const char* mapName )
{
Com_sprintf(query, querySize, "getpk3bymapname.php/%s", mapName);
}
static void PrintError( mapDownload_t* dl, PRINTF_FORMAT_STRING const char* format, ... )
{
va_list ap;
va_start(ap, format);
Q_vsnprintf(dl->tempMessage, sizeof(dl->tempMessage), format, ap);
va_end(ap);
if (dl->realMapName && dl->mapName[0] != '\0')
Com_sprintf(dl->errorMessage, sizeof(dl->errorMessage), "^bMap DL failed: ^7map '%s' - %s", dl->mapName, dl->tempMessage);
else
Com_sprintf(dl->errorMessage, sizeof(dl->errorMessage), "^bMap DL failed: ^7%s", dl->tempMessage);
// only append a line return if there wasn't one already
const int l = strlen(dl->errorMessage);
if (l > 0 && dl->errorMessage[l - 1] != '\n')
Q_strcat(dl->errorMessage, sizeof(dl->errorMessage), "\n");
Com_Printf(dl->errorMessage);
}
#if defined(_WIN32)
static void PrintSocketError( mapDownload_t* dl, const char* functionName, int ec )
{
const int bufferSize = sizeof(dl->tempMessage2);
const int bw = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, (DWORD)ec, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
dl->tempMessage2, (DWORD)bufferSize, NULL);
if (bw <= 0) {
*dl->tempMessage2 = '\0';
PrintError(dl, "%s failed: %d", functionName, ec);
return;
}
int lastByte = bw;
if (lastByte >= bufferSize)
lastByte = bufferSize - 1;
dl->tempMessage2[lastByte] = '\0';
PrintError(dl, "%s failed: %d -> %s", functionName, ec, dl->tempMessage2);
}
#else
static void PrintSocketError( mapDownload_t* dl, const char* functionName, int ec )
{
#if defined(__FreeBSD__) || ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE)
// XSI strerror_r
const int serec = strerror_r(ec, dl->tempMessage2, sizeof(dl->tempMessage2));
const char* const errorMsg = dl->tempMessage2;
if (serec != 0) {
#else
// GNU strerror_r
const char* const errorMsg = strerror_r(ec, dl->tempMessage2, sizeof(dl->tempMessage2));
if (errorMsg == NULL) {
#endif
PrintError(dl, "%s failed with error %d", functionName, ec);
return;
}
PrintError(dl, "%s failed with error %d (%s)", functionName, ec, errorMsg);
}
#endif
static int GetSocketError()
{
#if defined(_WIN32)
return WSAGetLastError();
#else
return errno;
#endif
}
static void PrintSocketError( mapDownload_t* dl, const char* functionName )
{
PrintSocketError(dl, functionName, GetSocketError());
}
static qbool IsSocketTimeoutError()
{
const int ec = GetSocketError();
#if defined(_WIN32)
return ec == WSAEWOULDBLOCK || ec == WSAETIMEDOUT;
#else
return ec == EAGAIN || ec == EWOULDBLOCK;
#endif
}
static qbool IsConnectionInProgressError()
{
const int ec = GetSocketError();
#if defined(_WIN32)
// WSAEWOULDBLOCK "A non-blocking socket operation could not be completed immediately."
// WSAEINPROGRESS "A blocking operation is currently executing."
return ec == WSAEWOULDBLOCK;
#else
// EINPROGRESS "The socket is nonblocking and the connection cannot be completed immediately."
return ec == EINPROGRESS;
#endif
}
static qbool SetSocketBlocking( SOCKET socket, qbool blocking )
{
#if defined(_WIN32)
u_long option = blocking ? 0 : 1;
return ioctlsocket(socket, FIONBIO, &option) != SOCKET_ERROR;
#else
const int flags = fcntl(socket, F_GETFL, 0);
if (flags == -1)
return qfalse;
const int newFlags = blocking ? (flags & ~O_NONBLOCK) : (flags | O_NONBLOCK);
return fcntl(socket, F_SETFL, newFlags) != SOCKET_ERROR;
#endif
}
static qbool SetSocketOption( mapDownload_t* dl, int option, const void* data, size_t dataLength )
{
#if defined _WIN32
if (setsockopt(dl->socket, SOL_SOCKET, option, (const char*)data, (int)dataLength) == SOCKET_ERROR) {
#else
if (setsockopt(dl->socket, SOL_SOCKET, option, data, (socklen_t)dataLength) == SOCKET_ERROR) {
#endif
PrintSocketError(dl, va("setsockopt %d", option));
return qfalse;
}
return qtrue;
}
static qbool GetSocketOption( mapDownload_t* dl, int option, void* data, size_t* dataLength )
{
#if defined _WIN32
int optionLength = (int)*dataLength;
if (getsockopt(dl->socket, SOL_SOCKET, option, (char*)data, &optionLength) == SOCKET_ERROR) {
#else
socklen_t optionLength = (socklen_t)*dataLength;
if (getsockopt(dl->socket, SOL_SOCKET, option, data, &optionLength) == SOCKET_ERROR) {
#endif
PrintSocketError(dl, "getsockopt");
return qfalse;
}
*dataLength = (size_t)optionLength;
return qtrue;
}
static bool EnsureDirectoryExists( const char* path )
{
#if defined(_WIN32)
return CreateDirectoryA(path, NULL) != 0 || GetLastError() == ERROR_ALREADY_EXISTS;
#else
struct stat st = { 0 };
if (stat(path, &st) == 0 && S_ISDIR(st.st_mode))
return qtrue;
// 0755 -> user RWX group/others RX
if (mkdir(path, 0755) == 0)
return qtrue;
return qfalse;
#endif
}
static void Download_Clear( mapDownload_t* dl )
{
// NOTE: we must not reset mapName, realMapName
*dl->tempPath = '\0';
*dl->finalName = '\0';
*dl->errorMessage = '\0';
dl->socket = INVALID_SOCKET;
dl->file = NULL;
dl->addressIndex = 0;
dl->addressCount = 0;
dl->startTimeMS = INT_MIN;
dl->crc32 = 0;
dl->bytesHeader = 0;
dl->bytesTotal = 0;
dl->bytesDownloaded = 0;
dl->headerParsed = qfalse;
dl->badResponse = qfalse;
dl->timeOutStartTimeMS = INT_MIN;
dl->lastErrorTimeOut = qfalse;
dl->sourceIndex = 0;
dl->exactMatch = qfalse;
dl->cleared = qtrue;
dl->connecting = qfalse;
}
static qbool Download_IsFileValid( mapDownload_t* dl )
{
const unsigned int fileSize = dl->bytesTotal - dl->bytesHeader;
if (fileSize == 0)
return qfalse;
FILE* const file = fopen(dl->tempPath, "rb");
if (file == NULL)
return qfalse;
const unsigned int maxBlockSize = (unsigned int)sizeof(dl->recBuffer);
const unsigned int fullBlockCount = fileSize / maxBlockSize;
const unsigned int lastBlockSize = fileSize - fullBlockCount * maxBlockSize;
unsigned int crc32;
CRC32_Begin(&crc32);
for (unsigned int i = 0; i < fullBlockCount; ++i) {
if (fread(dl->recBuffer, maxBlockSize, 1, file) != 1) {
fclose(file);
return qfalse;
}
CRC32_ProcessBlock(&crc32, dl->recBuffer, maxBlockSize);
}
if (lastBlockSize > 0) {
if (fread(dl->recBuffer, lastBlockSize, 1, file) != 1) {
fclose(file);
return qfalse;
}
CRC32_ProcessBlock(&crc32, dl->recBuffer, lastBlockSize);
}
CRC32_End(&crc32);
fclose(file);
if (crc32 != dl->crc32) {
PrintError(dl, "The CRC32 for %s was %08X instead of %08X", dl->finalName, crc32, dl->crc32);
return qfalse;
}
return qtrue;
}
// fails if the dest path already exists
static qbool RenameFile( const char* source, const char* dest )
{
// note: the rename function behaves differently on Windows and Linux
// Windows: dest path cannot exist
// Linux: if dest path exists, old file gets erased
#if defined(_WIN32)
return MoveFileA(source, dest) != 0;
#else
struct stat destInfo;
if (stat(dest, &destInfo) == 0)
return qfalse;
return rename(source, dest) == 0;
#endif
}
static qbool Download_Rename( mapDownload_t* dl )
{
char dir[MAX_PATH];
#if defined(_WIN32)
Q_strncpyz(dir, "baseq3\\", sizeof(dir));
#else
Q_strncpyz(dir, "baseq3/", sizeof(dir));
#endif
char name[MAX_PATH];
if (*dl->finalName == '\0') {
Q_strncpyz(name, dl->mapName, sizeof(name));
} else {
Q_strncpyz(name, dl->finalName, sizeof(name));
const int l = strlen(dl->finalName);
if (Q_stricmp(name + l - 4, ".pk3") == 0)
name[l - 4] = '\0';
}
// try with the desired name
const char* const fs_homepath = Cvar_VariableString("fs_homepath");
const char* finalPath = FS_BuildOSPath(fs_homepath, "baseq3", va("%s.pk3", name));
Q_strncpyz(dl->finalPath, finalPath, sizeof(dl->finalPath));
if (RenameFile(dl->tempPath, dl->finalPath))
return qtrue;
// try a few more times with random name suffixes
for (int i = 0; i < 4; ++i) {
// the suffix is 24 bits long, i.e. 6 characters
const unsigned int suffix0 = (unsigned int)rand() % (1 << 12);
const unsigned int suffix1 = (unsigned int)rand() % (1 << 12);
const unsigned int suffix = suffix0 | (suffix1 << 12);
finalPath = FS_BuildOSPath(fs_homepath, "baseq3", va("%s_%06x.pk3", name, suffix));
Q_strncpyz(dl->finalPath, finalPath, sizeof(dl->finalPath));
if (RenameFile(dl->tempPath, dl->finalPath))
return qtrue;
}
finalPath = FS_BuildOSPath(fs_homepath, "baseq3", va("%s.pk3", name));
PrintError(dl, "Failed to rename '%s' to '%s' or a similar name", dl->tempPath, finalPath);
return qfalse;
}
static qbool Download_CleanUp( mapDownload_t* dl, qbool rename )
{
if (!cl_mapDL.cleared)
return qfalse;
if (dl->socket != INVALID_SOCKET) {
Q_closesocket(dl->socket);
dl->socket = INVALID_SOCKET;
}
if (dl->file != NULL) {
fclose(dl->file);
dl->file = NULL;
}
qbool success = qtrue;
if (rename) {
if (dl->crc32 != 0)
success = Download_IsFileValid(dl);
if (success)
success = Download_Rename(dl);
}
if (Q_unlink(dl->tempPath) != 0 && errno != ENOENT) {
// ENOENT means the file wasn't found, which is good because
// it means our previous code was successful
PrintError(dl, "Failed to delete file '%s'", dl->tempPath);
}
return success;
}
static qbool Download_SendFileRequest( mapDownload_t* dl )
{
const mapDownloadSource_t& source = cl_mapDLSources[dl->sourceIndex];
const int port = source.port;
const char* const hostName = dl->addressIndex >= dl->addressCount ? source.numericHostName : source.hostName;
const char* const query = dl->query;
char request[256];
Com_sprintf(request, sizeof(request), "GET /%s HTTP/1.0\r\nHost: %s:%d\r\n\r\n", query, hostName, port);
const int requestLength = strlen(request);
if (send(dl->socket, request, requestLength, 0) != requestLength) {
PrintSocketError(dl, "send");
return qfalse;
}
const char* const tempPathBase = FS_BuildOSPath(Cvar_VariableString("fs_homepath"), "baseq3", "");
if (!EnsureDirectoryExists(tempPathBase)) {
PrintError(dl, "Couldn't create the baseq3 directory in fs_homepath");
return qfalse;
}
#if defined(_WIN32)
if (GetTempFileNameA(tempPathBase, "", 0, dl->tempPath) == 0) {
PrintError(dl, "Couldn't create a file name");
return qfalse;
}
dl->file = fopen(dl->tempPath, "wb");
#else
Com_sprintf(dl->tempPath, sizeof(dl->tempPath), "%s/XXXXXX.tmp", tempPathBase);
const int fd = mkstemps(dl->tempPath, 4);
dl->file = fd != -1 ? fdopen(fd, "wb") : NULL;
#endif
if (dl->file == NULL) {
const int error = errno;
char* const errorString = strerror(error);
PrintError(dl, "Failed to open file '%s': %s (%d)", dl->tempPath, errorString ? errorString : "?", error);
return qfalse;
}
dl->startTimeMS = Sys_Milliseconds();
return qtrue;
}
static qbool Download_CreateSocket( mapDownload_t* dl )
{
if (dl->socket != INVALID_SOCKET) {
Q_closesocket(dl->socket);
dl->socket = INVALID_SOCKET;
}
dl->socket = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
if (dl->socket == INVALID_SOCKET) {
PrintSocketError(dl, "socket");
return qfalse;
}
if (!SetSocketBlocking(dl->socket, qfalse)) {
PrintSocketError(dl, "ioctlsocket/fnctl");
return qfalse;
}
// We want to block no longer than 1 ms every frame.
#if defined(_WIN32)
DWORD timeout = 1;
#else
timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = 1000;
#endif
if (!SetSocketOption(dl, SO_RCVTIMEO, &timeout, sizeof(timeout)))
return qfalse;
// We want to block no longer than MAX_TIMEOUT_MS ms once.
#if defined(_WIN32)
timeout = MAX_TIMEOUT_MS;
#else
timeout.tv_sec = MAX_TIMEOUT_MS / 1000;
timeout.tv_usec = MAX_TIMEOUT_MS * 1000 - timeout.tv_sec * 1000000;
#endif
if (!SetSocketOption(dl, SO_SNDTIMEO, &timeout, sizeof(timeout)))
return qfalse;
return qtrue;
}
enum connState_t {
CS_OPEN,
CS_OPENING,
CS_CLOSED,
CS_LIST_EXHAUSTED
};
static connState_t Download_OpenNextConnection( mapDownload_t* dl )
{
if (dl->addressIndex >= dl->addressCount)
return CS_LIST_EXHAUSTED;
if (dl->addressIndex >= 1) {
Com_Printf("Attempting download again at address #%d...\n", dl->addressIndex + 1);
// We destroy and re-create the socket because non-blocking connect calls can't be canceled.
// Making it blocking to wait around means our custom time-out duration is gone.
if (!Download_CreateSocket(dl))
return CS_CLOSED;
}
const sockaddr_in& address = dl->addresses[dl->addressIndex];
if (connect(dl->socket, (const sockaddr*)&address, sizeof(sockaddr_in)) != SOCKET_ERROR) {
const connState_t result = Download_SendFileRequest(dl) ? CS_OPEN : CS_CLOSED;
++dl->addressIndex;
return result;
}
++dl->addressIndex;
if (!IsConnectionInProgressError()) {
PrintSocketError(dl, "connect");
return CS_CLOSED;
}
dl->timeOutStartTimeMS = Sys_Milliseconds();
return CS_OPENING;
}
static connState_t Download_FinishCurrentConnection( mapDownload_t* dl )
{
const int now = Sys_Milliseconds();
if (now - dl->timeOutStartTimeMS >= MAX_TIMEOUT_MS) {
PrintError(dl, "Failed to connect longer than " XSTRING(MAX_TIMEOUT_MS) "ms");
return CS_CLOSED;
}
const SOCKET socket = dl->socket;
fd_set writeSet;
FD_ZERO(&writeSet);
FD_SET(socket, &writeSet);
fd_set exceptionSet;
FD_ZERO(&exceptionSet);
FD_SET(socket, &exceptionSet);
timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 500;
// see if our socket is write-able yet
const int selectResult = select(socket + 1, NULL, &writeSet, &exceptionSet, &tv);
if (selectResult == -1) {
PrintSocketError(dl, "select");
return CS_CLOSED;
}
if (selectResult == 0) {
// nothing happened yet, so we wait
return CS_OPENING;
}
// now we can actually query the connect status
#if defined(_WIN32)
DWORD connectResult = 0;
#else
int connectResult = 0;
#endif
size_t connectResultLength = sizeof(connectResult);
if (!GetSocketOption(dl, SO_ERROR, &connectResult, &connectResultLength)) {
PrintSocketError(dl, "getsockopt");
return CS_CLOSED;
}
if (connectResult != 0) {
PrintSocketError(dl, "connect (delay)", (int)connectResult);
return CS_CLOSED;
}
if (!SetSocketBlocking(dl->socket, qtrue)) {
PrintSocketError(dl, "ioctlsocket/fnctl");
return CS_CLOSED;
}
if (!Download_SendFileRequest(dl)) {
return CS_CLOSED;
}
dl->timeOutStartTimeMS = INT_MIN;
return CS_OPEN;
}
static qbool Download_Begin( mapDownload_t* dl, int sourceIndex )
{
Download_CleanUp(dl, qfalse);
Download_Clear(dl);
dl->sourceIndex = sourceIndex;
if (!Download_CreateSocket(dl))
return qfalse;
addrInfo_t hints;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
const mapDownloadSource_t& source = cl_mapDLSources[dl->sourceIndex];
addrInfo_t* addresses;
const int ec = getaddrinfo(source.hostName, va("%d", source.port), &hints, &addresses);
if (ec == 0) {
addrInfo_t* a = addresses;
while (a != NULL && dl->addressCount < ARRAY_LEN(dl->addresses)) {
sockaddr_in& address = dl->addresses[dl->addressCount++];
memset(&address, 0, sizeof(sockaddr_in));
memcpy(&address, a->ai_addr, sizeof(*a->ai_addr));
a = a->ai_next;
}
freeaddrinfo(addresses);
} else {
// EAI* errors map to WSA* errors, so it's ok to call this
PrintSocketError(dl, "getaddrinfo", ec);
}
if (dl->addressCount < ARRAY_LEN(dl->addresses)) {
sockaddr_in& address = dl->addresses[dl->addressCount++];
memset(&address, 0, sizeof(address));
address.sin_family = AF_INET;
address.sin_port = htons(source.port);
inet_pton(AF_INET, source.numericHostName, &address.sin_addr.s_addr);
}
for (;;) {
const connState_t result = Download_OpenNextConnection(dl);
if (result == CS_OPENING) {
dl->connecting = qtrue;
return qtrue;
}
if (result == CS_OPEN) {
dl->timeOutStartTimeMS = INT_MIN;
return qtrue;
}
if(result == CS_LIST_EXHAUSTED)
return qfalse;
}
}
static qbool IsWhiteSpace( char c )
{
return c == '\r' || c == '\n' || c == '\t' || c == ' ';
}
static void RemoveTrailingWhiteSpace( char* s )
{
const int l = strlen(s);
int i = l;
while (i--) {
if (!IsWhiteSpace(s[i])) {
if (i + 1 < l)
s[i + 1] = '\0';
break;
}
}
}
static qbool ParseHeader( unsigned int* headerLength, mapDownload_t* dl )
{
if (dl->badResponse) {
RemoveTrailingWhiteSpace(dl->recBuffer);
if (*dl->recBuffer != '\0')
PrintError(dl, "HTTP status %s - %s", dl->httpHeaderValue, dl->recBuffer);
else
PrintError(dl, "HTTP status %s", dl->httpHeaderValue);
return qfalse;
}
// note: sscanf %s with the width specifier will null terminate in overflow cases too
#define MAXSTRLEN 512
#define WSPEC XSTRING(MAXSTRLEN)
static char httpHeaderValue[MAXSTRLEN];
static char header[MAXSTRLEN];
static char value[MAXSTRLEN];
static char fileName[MAXSTRLEN];
qbool badResponse = qfalse;
const char* s = dl->recBuffer;
for (;;) {
qbool httpHeader = qfalse;
int bytesRead = 0;
if (sscanf(s, "HTTP/1.1 %" WSPEC "[^\r]\r\n%n", httpHeaderValue, &bytesRead) == 1)
httpHeader = qtrue;
else if (sscanf(s, "%" WSPEC "[^:]: %" WSPEC "[^\r]\r\n%n", header, value, &bytesRead) != 2)
break;
s += bytesRead;
if (badResponse)
continue;
if (httpHeader) {
int code;
if (sscanf(httpHeaderValue, "%d", &code) == 1 && code != 200)
badResponse = qtrue;
} else if (Q_stricmp(header, "Content-Length") == 0) {
int temp;
if (sscanf(value, "%d", &temp) == 1)
dl->bytesContent = temp;
} else if (Q_stricmp(header, "Content-Disposition") == 0) {
const size_t l = strlen("filename=");
const char* valueFileName = strstr(value, "filename=");
if (valueFileName != NULL) {
valueFileName += l;
if (*valueFileName == '\"')
valueFileName++;
if (sscanf(valueFileName, "%" WSPEC "[^\";\r]", fileName) == 1)
Q_strncpyz(dl->finalName, fileName, sizeof(dl->finalName));
}
} else if (Q_stricmp(header, "X-CNQ3-CRC32") == 0) {
unsigned int temp;
if (sscanf(value, "%x", &temp) == 1)
dl->crc32 = temp;
}
}
if (badResponse) {
if (Q_stricmpn(s - 4, "\r\n\r\n", 4) == 0) {
RemoveTrailingWhiteSpace((char*)s);
if (*s != '\0') {
PrintError(dl, "%s - %s", httpHeaderValue, s);
return qfalse;
} else {
dl->badResponse = qtrue;
Q_strncpyz(dl->httpHeaderValue, httpHeaderValue, sizeof(dl->httpHeaderValue));
return qtrue;
}
}
return qfalse;
}
if (Q_stricmpn(s - 4, "\r\n\r\n", 4) == 0) {
if (dl->bytesContent == 0) {
PrintError(dl, "Content-Length wasn't defined or was invalid");
return qfalse;
}
if (dl->finalName[0] == '\0') {
PrintError(dl, "Content-Disposition wasn't defined or was missing the filename field");
return qfalse;
}
dl->headerParsed = qtrue;
}
const unsigned int headerBytes = s - dl->recBuffer;
dl->bytesHeader += headerBytes;
if (dl->headerParsed) {
dl->bytesTotal = dl->bytesHeader + dl->bytesContent;
*headerLength = headerBytes;
}
return qtrue;
#undef WSPEC
#undef MAXSTRLEN
}
int Download_Continue( mapDownload_t* dl )
{
if (dl->socket == INVALID_SOCKET)
return MDLS_NOTHING;
if (dl->connecting) {
connState_t cs = Download_FinishCurrentConnection(dl);
if (cs == CS_CLOSED) {
for (;;) {
cs = Download_OpenNextConnection(dl);
if (cs == CS_OPENING)
return MDLS_IN_PROGRESS;
if (cs == CS_OPEN) {
dl->connecting = qfalse;
dl->timeOutStartTimeMS = INT_MIN;
dl->lastErrorTimeOut = qfalse;
return MDLS_IN_PROGRESS;
}
if (cs == CS_LIST_EXHAUSTED) {
Download_CleanUp(dl, qfalse);
return MDLS_ERROR;
}
}
}
if (cs == CS_OPENING)
return MDLS_IN_PROGRESS;
// cs == CS_OPEN
dl->connecting = qfalse;
dl->timeOutStartTimeMS = INT_MIN;
dl->lastErrorTimeOut = qfalse;
return MDLS_IN_PROGRESS;
}
// the -1 is necessary because we need to be able to safely null-terminate
// the buffer for ParseHeader without stomping another buffer's memory
const int ec = recv(dl->socket, dl->recBuffer, sizeof(dl->recBuffer) - 1, 0);
if (ec < 0) {
if (IsSocketTimeoutError()) {
const int now = Sys_Milliseconds();
if (!dl->lastErrorTimeOut)
dl->timeOutStartTimeMS = now;
if (now - dl->timeOutStartTimeMS >= MAX_TIMEOUT_MS) {
PrintError(dl, "Timed out for more than " XSTRING(MAX_TIMEOUT_MS) "ms");
Download_CleanUp(dl, qfalse);
return MDLS_ERROR;
}
dl->lastErrorTimeOut = qtrue;
return MDLS_IN_PROGRESS;
}
PrintSocketError(dl, "recv");
Download_CleanUp(dl, qfalse);
return MDLS_ERROR;
}
if (ec == 0) {
if (dl->bytesDownloaded == dl->bytesTotal)
return Download_CleanUp(dl, qtrue) ? MDLS_SUCCESS : MDLS_ERROR;
if (dl->badResponse)
PrintError(dl, "HTTP status %s", dl->httpHeaderValue);
else
PrintError(dl, "Connection closed too early");
Download_CleanUp(dl, qfalse);
return MDLS_ERROR;
}
dl->bytesDownloaded += ec;
unsigned int offset = 0;
if (!dl->headerParsed) {
// make sure ParseHeader can read the buffer as a C string
dl->recBuffer[ec] = '\0';
if (!ParseHeader(&offset, dl)) {
Download_CleanUp(dl, qfalse);
return MDLS_ERROR;
}
}
const unsigned int bytesToWrite = ec - offset;
if (dl->headerParsed && bytesToWrite > 0) {
if (fwrite(dl->recBuffer + offset, bytesToWrite, 1, dl->file) != 1) {
const int error = errno;
char* const errorString = strerror(error);
PrintError(dl, "Failed to write %d bytes to '%s': %s (%d)",
(int)(ec - offset), dl->tempPath, errorString ? errorString : "?", error);
Download_CleanUp(dl, qfalse);
return MDLS_ERROR;
}
}
if (dl->bytesDownloaded == dl->bytesTotal)
return Download_CleanUp(dl, qtrue) ? MDLS_SUCCESS : MDLS_ERROR;
dl->timeOutStartTimeMS = INT_MIN;
dl->lastErrorTimeOut = qfalse;
return MDLS_IN_PROGRESS;
}
static qbool CL_MapDownload_StartImpl( const char* mapName, int sourceIndex, qbool fromCommand, qbool exactMatch, qbool realMapName )
{
const mapDownloadSource_t& source = cl_mapDLSources[sourceIndex];
Com_Printf("Attempting download from the %s map server...\n", source.name);
Q_strncpyz(cl_mapDL.mapName, mapName, sizeof(cl_mapDL.mapName));
cl_mapDL.realMapName = realMapName;
const qbool success = Download_Begin(&cl_mapDL, sourceIndex);
if (!success) {
Download_CleanUp(&cl_mapDL, qfalse);
if (!fromCommand)
Com_Error(ERR_DROP, cl_mapDL.errorMessage);
return qfalse;
}
// We set these after the Download_Begin call since it clears cl_mapDL.
cl_mapDL.fromCommand = fromCommand;
cl_mapDL.sourceIndex = sourceIndex;
cl_mapDL.exactMatch = exactMatch;
if (!fromCommand) {
Cvar_Set("cl_downloadName", mapName);
Cvar_Set("cl_downloadSize", "0");
Cvar_Set("cl_downloadCount", "0");
Cvar_SetValue("cl_downloadTime", cls.realtime);
}
return qtrue;
}
static qbool CL_MapDownload_CheckActive()
{
if (!CL_MapDownload_Active())
return qfalse;
PrintError(&cl_mapDL, "Download already in progress for map %s", cl_mapDL.mapName);
return qtrue;
}
qbool CL_MapDownload_Start( const char* mapName, qbool fromCommand )
{
if (CL_MapDownload_CheckActive())
return qfalse;
(*cl_mapDLSources[0].formatQuery)(cl_mapDL.query, sizeof(cl_mapDL.query), mapName);
if (CL_MapDownload_StartImpl(mapName, 0, fromCommand, qfalse, qtrue))
return qtrue;
(*cl_mapDLSources[1].formatQuery)(cl_mapDL.query, sizeof(cl_mapDL.query), mapName);
return CL_MapDownload_StartImpl(mapName, 1, fromCommand, qfalse, qtrue);
}
qbool CL_MapDownload_Start_MapChecksum( const char* mapName, unsigned int mapCrc32, qbool exactMatch )
{
if (mapCrc32 == 0 || CL_MapDownload_CheckActive())
return qfalse;
Com_sprintf(cl_mapDL.query, sizeof(cl_mapDL.query), "map?n=%s&m=%x", mapName, mapCrc32);
if (!exactMatch)
Q_strcat(cl_mapDL.query, sizeof(cl_mapDL.query), "&e=0");
return CL_MapDownload_StartImpl(mapName, 0, qfalse, exactMatch, qtrue);
}
qbool CL_MapDownload_Start_PakChecksums( const char* mapName, unsigned int* pakChecksums, int pakCount, qbool exactMatch )
{
if (pakCount == 0 || CL_MapDownload_CheckActive())
return qfalse;
Com_sprintf(cl_mapDL.query, sizeof(cl_mapDL.query), "map?n=%s&p=", mapName);
Q_strcat(cl_mapDL.query, sizeof(cl_mapDL.query), va("%x", pakChecksums[0]));
for (int i = 1; i < pakCount; ++i) {
Q_strcat(cl_mapDL.query, sizeof(cl_mapDL.query), va(",%x", pakChecksums[i]));
}
if (!exactMatch)
Q_strcat(cl_mapDL.query, sizeof(cl_mapDL.query), "&e=0");
return CL_MapDownload_StartImpl(mapName, 0, qfalse, exactMatch, qtrue);
}
qbool CL_PakDownload_Start( unsigned int checksum, qbool fromCommand, const char* mapName )
{
if (checksum == 0 || CL_MapDownload_CheckActive())
return qfalse;
Com_sprintf(cl_mapDL.query, sizeof(cl_mapDL.query), "pak?%x", checksum);
qbool realMapName = qtrue;
char name[64];
if (mapName == NULL || mapName[0] == '\0') {
Com_sprintf(name, sizeof(name), "%x", checksum);
mapName = name;
realMapName = qfalse;
}
return CL_MapDownload_StartImpl(mapName, 0, fromCommand, qtrue, realMapName);
}
static void CL_MapDownload_ClearCvars()
{
Cvar_Set("cl_downloadSize", "0");
Cvar_Set("cl_downloadCount", "0");
Cvar_Set("cl_downloadName", "");
Cvar_SetValue("cl_downloadTime", cls.realtime);
}
void CL_MapDownload_Continue()
{
const int status = Download_Continue(&cl_mapDL);
if (status == MDLS_SUCCESS) {
FS_Restart(clc.checksumFeed);
if (!cl_mapDL.fromCommand) {
CL_DownloadsComplete();
CL_MapDownload_ClearCvars();
}
Com_Printf("'%s' downloaded successfully to '%s'\n", cl_mapDL.finalName, cl_mapDL.finalPath);
} else if (status == MDLS_IN_PROGRESS) {
if (!cl_mapDL.fromCommand) {
Cvar_Set("cl_downloadSize", va("%d", cl_mapDL.bytesTotal));
Cvar_Set("cl_downloadCount", va("%d", cl_mapDL.bytesDownloaded));
}
} else if (status == MDLS_ERROR) {
if (!cl_mapDL.fromCommand) {
if (clc.demoplaying)
CL_DemoCompleted();
CL_MapDownload_ClearCvars();
Com_Error(ERR_DROP, cl_mapDL.errorMessage);
} else if (cl_mapDL.sourceIndex == 0 && !cl_mapDL.exactMatch) {
(*cl_mapDLSources[1].formatQuery)(cl_mapDL.query, sizeof(cl_mapDL.query), cl_mapDL.mapName);
CL_MapDownload_StartImpl(cl_mapDL.mapName, 1, cl_mapDL.fromCommand, qfalse, cl_mapDL.realMapName);
}
}
}
void CL_MapDownload_Init()
{
Download_Clear(&cl_mapDL);
}
qbool CL_MapDownload_Active()
{
return cl_mapDL.cleared && cl_mapDL.socket != INVALID_SOCKET;
}
void CL_MapDownload_Cancel()
{
if (!CL_MapDownload_Active())
return;
Download_CleanUp(&cl_mapDL, qfalse);
CL_MapDownload_ClearCvars();
}
// negative if nothing's going on
static float CL_MapDownload_Progress()
{
if (!CL_MapDownload_Active() || !cl_mapDL.fromCommand || cl_mapDL.bytesTotal < 1)
return -1;
const uint64_t t = (uint64_t)cl_mapDL.bytesTotal;
const uint64_t d = (uint64_t)cl_mapDL.bytesDownloaded;
const double p = ((double)d * 100.0) / (double)t;
const float progress = min((float)p, 100.0f);
return progress;
}
// bytes/s, negative if nothing's going on
static int CL_MapDownload_Speed()
{
if (!CL_MapDownload_Active() || !cl_mapDL.fromCommand || cl_mapDL.bytesTotal < 1)
return -1;
const int startMS = cl_mapDL.startTimeMS;
const int nowMS = Sys_Milliseconds();
const int elapsedMS = nowMS - startMS;
if (startMS == INT_MIN || elapsedMS <= 0)
return -1;
return (int)(((uint64_t)cl_mapDL.bytesDownloaded * 1000) / (uint64_t)elapsedMS);
}
static void FormatSize( char* buffer, int bufferSize, unsigned int bytes )
{
unsigned int m = (unsigned int)(-1);
unsigned int x = bytes;
while (x) {
x >>= 10;
m++;
}
if (m == 0)
Com_sprintf(buffer, bufferSize, "%u bytes", bytes);
else if (m == 1)
Com_sprintf(buffer, bufferSize, "%u KB", bytes >> 10);
else if (m == 2)
Com_sprintf(buffer, bufferSize, "%.1f MB", (float)(bytes >> 10) / 1024.0f);
else
Com_sprintf(buffer, bufferSize, "%.2f GB", (float)(bytes >> 20) / 1024.0f);
}
static void FormatTime( char* buffer, int bufferSize, unsigned int seconds )
{
const int s = seconds % 60;
const int m = seconds / 60;
if (m > 0)
Com_sprintf(buffer, bufferSize, "%dm %2ds", m, s);
else
Com_sprintf(buffer, bufferSize, "%2ds", s);
}
void CL_MapDownload_DrawConsole( float cw, float ch )
{
const float progress = CL_MapDownload_Progress();
if (progress < 0.0f)
return;
const float vw = cls.glconfig.vidWidth;
char msg0[128];
const char* fileName = cl_mapDL.finalName[0] != '\0' ? cl_mapDL.finalName : "pk3";
Com_sprintf(msg0, sizeof(msg0), "Downloading %s: %2d%%", fileName, (int)progress);
const float wl0 = cw * strlen(msg0);
re.SetColor(colorWhite);
SCR_DrawString(vw - wl0 - cw / 2, ch / 2, cw, ch, msg0, qtrue);
const int speed = CL_MapDownload_Speed();
if (speed <= 0)
return;
char size[64];
FormatSize(size, sizeof(size), speed);
char msg1[128];
Com_sprintf(msg1, sizeof(msg1), "Speed: %s/s", size);
const float wl1 = cw * strlen(msg1);
SCR_DrawString(vw - wl1 - cw / 2, 3 * ch / 2, cw, ch, msg1, qtrue);
if (progress <= 0.0f)
return;
const int elapsedMS = Sys_Milliseconds() - cl_mapDL.startTimeMS;
const int totalMS = (int)((elapsedMS * 100.0f) / progress);
const int remainingMS = max(totalMS - elapsedMS, 0);
char time[64];
FormatTime(time, sizeof(time), remainingMS / 1000);
char msg2[128];
Com_sprintf(msg2, sizeof(msg2), "Time left: %s", time);
const float wl2 = cw * strlen(msg2);
SCR_DrawString(vw - wl2 - cw / 2, 5 * ch / 2, cw, ch, msg2, qtrue);
}
void CL_MapDownload_CrashCleanUp()
{
if (cl_mapDL.file != NULL && cl_mapDL.tempPath[0] != '\0') {
fclose(cl_mapDL.file);
Q_unlink(cl_mapDL.tempPath);
}
}
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