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Fix a crash (assert) when client set serial version < 24 in INIT

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When SER_FMT_VER_LOWEST is set to zero, then the test is stupid in INIT because all client works. In mapblock we check if client's serialization version is < 24, but if client sent serialization version < 24 (15 for example) the server set it and tried to send nodes, then BOOM

To resolve the problem:
* Create a different CLIENT_MIN_VERSION to handle this problem
* Remove the exception
* Use an assert in case of bad developer code
This commit is contained in:
Loic Blot 2015-01-26 15:52:02 +01:00 committed by Kahrl
parent eeea454bff
commit 80a7408e4d
4 changed files with 7 additions and 6 deletions
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6
src/mapblock.cpp
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@ -526,11 +526,7 @@ void MapBlock::serialize(std::ostream &os, u8 version, bool disk)
throw SerializationError("ERROR: Not writing dummy block."); throw SerializationError("ERROR: Not writing dummy block.");
} }
// Can't do this anymore; we have 16-bit dynamically allocated node IDs assert(version >= SER_FMT_CLIENT_VER_LOWEST);
// in memory; conversion just won't work in this direction.
if(version < 24)
throw SerializationError("MapBlock::serialize: serialization to "
"version < 24 not possible");
// First byte // First byte
u8 flags = 0; u8 flags = 0;

1
src/mapblock.h
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@ -494,6 +494,7 @@ public:
// These don't write or read version by itself // These don't write or read version by itself
// Set disk to true for on-disk format, false for over-the-network format // Set disk to true for on-disk format, false for over-the-network format
// Precondition: version >= SER_FMT_CLIENT_VER_LOWEST
void serialize(std::ostream &os, u8 version, bool disk); void serialize(std::ostream &os, u8 version, bool disk);
// If disk == true: In addition to doing other things, will add // If disk == true: In addition to doing other things, will add
// unknown blocks from id-name mapping to wndef // unknown blocks from id-name mapping to wndef

4
src/serialization.h
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@ -71,6 +71,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#define SER_FMT_VER_HIGHEST_WRITE 25 #define SER_FMT_VER_HIGHEST_WRITE 25
// Lowest supported serialization version // Lowest supported serialization version
#define SER_FMT_VER_LOWEST 0 #define SER_FMT_VER_LOWEST 0
// Lowest client supported serialization version
// Can't do < 24 anymore; we have 16-bit dynamically allocated node IDs
// in memory; conversion just won't work in this direction.
#define SER_FMT_CLIENT_VER_LOWEST 24
inline bool ser_ver_supported(s32 v) { inline bool ser_ver_supported(s32 v) {
return v >= SER_FMT_VER_LOWEST && v <= SER_FMT_VER_HIGHEST_READ; return v >= SER_FMT_VER_LOWEST && v <= SER_FMT_VER_HIGHEST_READ;

2
src/server.cpp
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@ -1366,7 +1366,7 @@ void Server::ProcessData(u8 *data, u32 datasize, u16 peer_id)
// Use the highest version supported by both // Use the highest version supported by both
int deployed = std::min(client_max, our_max); int deployed = std::min(client_max, our_max);
// If it's lower than the lowest supported, give up. // If it's lower than the lowest supported, give up.
if(deployed < SER_FMT_VER_LOWEST) if(deployed < SER_FMT_CLIENT_VER_LOWEST)
deployed = SER_FMT_VER_INVALID; deployed = SER_FMT_VER_INVALID;
if(deployed == SER_FMT_VER_INVALID) if(deployed == SER_FMT_VER_INVALID)