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Code Issues Releases Wiki Activity

Add missing checks to texture caching

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This commit is contained in:
Perttu Ahola 2012-01-04 00:37:46 +02:00
parent f9d7e399b2
commit bc743ca7ce
3 changed files with 34 additions and 3 deletions
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17
src/client.cpp
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@ -1276,6 +1276,13 @@ void Client::ProcessData(u8 *data, u32 datasize, u16 sender_peer_id)
//read texture from cache
std::string name = deSerializeString(is);
std::string sha1_texture = deSerializeString(is);
// if name contains illegal characters, ignore the texture
if(!string_allowed(name, TEXTURENAME_ALLOWED_CHARS)){
errorstream<<"Client: ignoring illegal texture name "
<<"sent by server: \""<<name<<"\""<<std::endl;
continue;
}
std::string tpath = getTextureCacheDir() + DIR_DELIM + name;
// Read data
@ -1371,8 +1378,6 @@ void Client::ProcessData(u8 *data, u32 datasize, u16 sender_peer_id)
for each texture {
u16 length of name
string name
u16 length of path
string path
}
*/
std::ostringstream os(std::ios_base::binary);
@ -1439,6 +1444,14 @@ void Client::ProcessData(u8 *data, u32 datasize, u16 sender_peer_id)
for(int i=0; i<num_textures; i++){
std::string name = deSerializeString(is);
std::string data = deSerializeLongString(is);
// if name contains illegal characters, ignore the texture
if(!string_allowed(name, TEXTURENAME_ALLOWED_CHARS)){
errorstream<<"Client: ignoring illegal texture name "
<<"sent by server: \""<<name<<"\""<<std::endl;
continue;
}
// Silly irrlicht's const-incorrectness
Buffer<char> data_rw(data.c_str(), data.size());
// Create an irrlicht memory file

2
src/clientserver.h
View File

@ -48,6 +48,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#define PASSWORD_SIZE 28 // Maximum password length. Allows for
// base64-encoded SHA-1 (27+\0).
#define TEXTURENAME_ALLOWED_CHARS "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_."
enum ToClientCommand
{
TOCLIENT_INIT = 0x10,

18
src/server.cpp
View File

@ -4273,6 +4273,12 @@ void Server::PrepareTextures() {
if(dirlist[j].dir) // Ignode dirs
continue;
std::string tname = dirlist[j].name;
// if name contains illegal characters, ignore the texture
if(!string_allowed(tname, TEXTURENAME_ALLOWED_CHARS)){
errorstream<<"Server: ignoring illegal texture name: \""
<<tname<<"\""<<std::endl;
continue;
}
std::string tpath = texturepath + DIR_DELIM + tname;
// Read data
std::ifstream fis(tpath.c_str(), std::ios_base::binary);
@ -4300,6 +4306,11 @@ void Server::PrepareTextures() {
<<tname<<"\""<<std::endl;
continue;
}
if(tmp_os.str().length() == 0){
errorstream<<"Server::PrepareTextures(): Empty file \""
<<tpath<<"\""<<std::endl;
continue;
}
SHA1 sha1;
sha1.addBytes(tmp_os.str().c_str(), tmp_os.str().length());
@ -4332,7 +4343,7 @@ struct SendableTextureAnnouncement
void Server::SendTextureAnnouncement(u16 peer_id){
DSTACK(__FUNCTION_NAME);
infostream<<"Server::SendTextureAnnouncement(): Calculate sha1 sums of textures and send to client"<<std::endl;
infostream<<"Server::SendTextureAnnouncement()"<<std::endl;
core::list<SendableTextureAnnouncement> texture_announcements;
@ -4407,6 +4418,11 @@ void Server::SendTexturesRequested(u16 peer_id,core::list<TextureRequest> tosend
u32 texture_size_bunch_total = 0;
for(core::list<TextureRequest>::Iterator i = tosend.begin(); i != tosend.end(); i++) {
if(m_Textures.find(i->name) == m_Textures.end()){
errorstream<<"Server::SendTexturesRequested(): Client asked for "
<<"unknown texture \""<<(i->name)<<"\""<<std::endl;
continue;
}
//TODO get path + name
std::string tpath = m_Textures[(*i).name].path;