The bulk of this commit just changes std::vector<std::string> to
StringVector when we deal with tokens from a websocket message.
The less boring part of it is the new StringVector class, which is a
wrapper around std::vector<std::string>, and provides the same API,
except that operator[] returns a string, not a string&, and this allows
returning an empty string in case that prevents reading past the end of
the underlying array.
This means in case client code forgets to check size() before invoking
operator[], we don't crash. (See the ~3 previous commits which fixed
such crashes.)
Later the ctor could be changed to take a single underlying string to
avoid lots of tiny allocations, that's not yet done in this commit.
Change-Id: I8a6082143a8ac0b65824f574b32104d7889c184f
Reviewed-on: https://gerrit.libreoffice.org/c/online/+/89687
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
==13901==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x000000904678 bp 0x7ffdb9e21580 sp 0x7ffdb9e21340 T0)
==13901==The signal is caused by a READ memory access.
==13901==Hint: address points to the zero page.
#0 0x904677 in LOOLProtocol::tokenize[abi:cxx11](char const*, unsigned long, char) common/Protocol.hpp:113:40
#1 0x898c52 in LOOLProtocol::tokenize(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, char) common/Protocol.hpp:141:16
#2 0x18dc2d9 in LOOLProtocol::ParseVersion(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) common/Protocol.cpp:35:51
#3 0x1148824 in ClientSession::_handleInput(char const*, int) wsd/ClientSession.cpp:358:64
#4 0x18efcb8 in Session::handleMessage(bool, WSOpCode, std::vector<char, std::allocator<char> >&) common/Session.cpp:232:13
Next commit will add the actual simple fuzzer that found this.
Change-Id: I8623b4451a57390f6f84c11084c5a1120a11fcc5
Reviewed-on: https://gerrit.libreoffice.org/c/online/+/89225
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Changes protocol to use 'wid' instead of 'hash' everywhere. Wire-ids
are monotonically increasing integers that can be mapped to hash
values for all of the hash values and tiles we cache internally.
Change-Id: Ibcb25817bab0f453e93d52a6f99d3ff65059e47d
The server tells the client the hash of each tile it sends (calculated
from the contents of the tile, not its PNG encoding). When the client
asks for a tile to be refreshed, it tells the server what the hash of
the existing tile is. If the server notices that the tile contents
hasn't actually changed, it doesn't PNG encode it and doesn't send it
to the client.
The intent is that this will reduce load on the server and also avoid
unnecessary tile traffic.
Change-Id: Ia06ca68655ea984ed4319f24f4470afda322eccf
