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Replace most usages of CN_PACKET_BUFFER_SIZE with usable body size

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This commit is contained in:
Gent Semaj 2024-10-28 19:50:35 -07:00
parent 8568fd1c46
commit 6ffde9bb44
Signed by untrusted user: ycc
GPG Key ID: 2D76C57BF6BEADC4
12 changed files with 48 additions and 43 deletions
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8
src/Abilities.cpp
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@ -334,8 +334,8 @@ void Abilities::useNanoSkill(CNSocket* sock, SkillData* skill, sNano& nano, std:
size_t resplen = sizeof(sP_FE2CL_NANO_SKILL_USE_SUCC);
for(SkillResult& sr : results)
resplen += sr.size;
uint8_t respbuf[CN_PACKET_BUFFER_SIZE];
memset(respbuf, 0, resplen);
uint8_t respbuf[CN_PACKET_BODY_SIZE];
memset(respbuf, 0, CN_PACKET_BODY_SIZE);
sP_FE2CL_NANO_SKILL_USE_SUCC* pkt = (sP_FE2CL_NANO_SKILL_USE_SUCC*)respbuf;
pkt->iPC_ID = plr->iID;
@ -379,8 +379,8 @@ void Abilities::useNPCSkill(EntityRef npc, int skillID, std::vector<ICombatant*>
size_t resplen = sizeof(sP_FE2CL_NPC_SKILL_HIT);
for(SkillResult& sr : results)
resplen += sr.size;
uint8_t respbuf[CN_PACKET_BUFFER_SIZE];
memset(respbuf, 0, resplen);
uint8_t respbuf[CN_PACKET_BODY_SIZE];
memset(respbuf, 0, CN_PACKET_BODY_SIZE);
sP_FE2CL_NPC_SKILL_HIT* pkt = (sP_FE2CL_NPC_SKILL_HIT*)respbuf;
pkt->iNPC_ID = npc.id;

4
src/Buddies.cpp
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@ -41,9 +41,9 @@ void Buddies::sendBuddyList(CNSocket* sock) {
// initialize response struct
size_t resplen = sizeof(sP_FE2CL_REP_PC_BUDDYLIST_INFO_SUCC) + buddyCnt * sizeof(sBuddyBaseInfo);
uint8_t respbuf[CN_PACKET_BUFFER_SIZE];
uint8_t respbuf[CN_PACKET_BODY_SIZE];
memset(respbuf, 0, resplen);
memset(respbuf, 0, CN_PACKET_BODY_SIZE);
sP_FE2CL_REP_PC_BUDDYLIST_INFO_SUCC* resp = (sP_FE2CL_REP_PC_BUDDYLIST_INFO_SUCC*)respbuf;
sBuddyBaseInfo* respdata = (sBuddyBaseInfo*)(respbuf + sizeof(sP_FE2CL_REP_PC_BUDDYLIST_INFO_SUCC));

6
src/Buffs.cpp
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@ -178,9 +178,9 @@ void Buffs::tickDrain(EntityRef self, Buff* buff, int mult) {
int dealt = combatant->takeDamage(buff->getLastSource(), damage);
size_t resplen = sizeof(sP_FE2CL_CHAR_TIME_BUFF_TIME_TICK) + sizeof(sSkillResult_Damage);
assert(resplen < CN_PACKET_BUFFER_SIZE - 8);
uint8_t respbuf[CN_PACKET_BUFFER_SIZE];
memset(respbuf, 0, resplen);
assert(resplen < CN_PACKET_BODY_SIZE);
uint8_t respbuf[CN_PACKET_BODY_SIZE];
memset(respbuf, 0, CN_PACKET_BODY_SIZE);
sP_FE2CL_CHAR_TIME_BUFF_TIME_TICK *pkt = (sP_FE2CL_CHAR_TIME_BUFF_TIME_TICK*)respbuf;
pkt->iID = self.id;

14
src/Combat.cpp
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@ -539,9 +539,9 @@ static void dealGooDamage(CNSocket *sock) {
return; // ignore completely
size_t resplen = sizeof(sP_FE2CL_CHAR_TIME_BUFF_TIME_TICK) + sizeof(sSkillResult_DotDamage);
assert(resplen < CN_PACKET_BUFFER_SIZE - 8);
uint8_t respbuf[CN_PACKET_BUFFER_SIZE];
memset(respbuf, 0, resplen);
assert(resplen < CN_PACKET_BODY_SIZE);
uint8_t respbuf[CN_PACKET_BODY_SIZE];
memset(respbuf, 0, CN_PACKET_BODY_SIZE);
sP_FE2CL_CHAR_TIME_BUFF_TIME_TICK *pkt = (sP_FE2CL_CHAR_TIME_BUFF_TIME_TICK*)respbuf;
sSkillResult_DotDamage *dmg = (sSkillResult_DotDamage*)(respbuf + sizeof(sP_FE2CL_CHAR_TIME_BUFF_TIME_TICK));
@ -633,9 +633,9 @@ static void pcAttackChars(CNSocket *sock, CNPacketData *data) {
// initialize response struct
size_t resplen = sizeof(sP_FE2CL_PC_ATTACK_CHARs_SUCC) + pkt->iTargetCnt * sizeof(sAttackResult);
uint8_t respbuf[CN_PACKET_BUFFER_SIZE];
uint8_t respbuf[CN_PACKET_BODY_SIZE];
memset(respbuf, 0, resplen);
memset(respbuf, 0, CN_PACKET_BODY_SIZE);
sP_FE2CL_PC_ATTACK_CHARs_SUCC *resp = (sP_FE2CL_PC_ATTACK_CHARs_SUCC*)respbuf;
sAttackResult *respdata = (sAttackResult*)(respbuf+sizeof(sP_FE2CL_PC_ATTACK_CHARs_SUCC));
@ -847,9 +847,9 @@ static void projectileHit(CNSocket* sock, CNPacketData* data) {
*/
size_t resplen = sizeof(sP_FE2CL_PC_GRENADE_STYLE_HIT) + pkt->iTargetCnt * sizeof(sAttackResult);
uint8_t respbuf[CN_PACKET_BUFFER_SIZE];
uint8_t respbuf[CN_PACKET_BODY_SIZE];
memset(respbuf, 0, resplen);
memset(respbuf, 0, CN_PACKET_BODY_SIZE);
sP_FE2CL_PC_GRENADE_STYLE_HIT* resp = (sP_FE2CL_PC_GRENADE_STYLE_HIT*)respbuf;
sAttackResult* respdata = (sAttackResult*)(respbuf + sizeof(sP_FE2CL_PC_GRENADE_STYLE_HIT));

6
src/Eggs.cpp
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@ -87,8 +87,8 @@ void Eggs::eggBuffPlayer(CNSocket* sock, int skillId, int eggId, int duration) {
// initialize response struct
size_t resplen = sizeof(sP_FE2CL_NPC_SKILL_HIT) + result.size;
uint8_t respbuf[CN_PACKET_BUFFER_SIZE];
memset(respbuf, 0, resplen);
uint8_t respbuf[CN_PACKET_BODY_SIZE];
memset(respbuf, 0, CN_PACKET_BODY_SIZE);
sP_FE2CL_NPC_SKILL_HIT* pkt = (sP_FE2CL_NPC_SKILL_HIT*)respbuf;
pkt->iNPC_ID = eggId;
@ -192,7 +192,7 @@ static void eggPickup(CNSocket* sock, CNPacketData* data) {
// drop
if (type->dropCrateId != 0) {
const size_t resplen = sizeof(sP_FE2CL_REP_REWARD_ITEM) + sizeof(sItemReward);
assert(resplen < CN_PACKET_BUFFER_SIZE - 8);
assert(resplen < CN_PACKET_BODY_SIZE);
// we know it's only one trailing struct, so we can skip full validation
uint8_t respbuf[resplen]; // not a variable length array, don't worry

12
src/Groups.cpp
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@ -87,8 +87,8 @@ void Groups::addToGroup(Group* group, EntityRef member) {
size_t pcCount = pcs.size();
size_t npcCount = npcs.size();
uint8_t respbuf[CN_PACKET_BUFFER_SIZE];
memset(respbuf, 0, CN_PACKET_BUFFER_SIZE);
uint8_t respbuf[CN_PACKET_BODY_SIZE];
memset(respbuf, 0, CN_PACKET_BODY_SIZE);
sP_FE2CL_PC_GROUP_JOIN* pkt = (sP_FE2CL_PC_GROUP_JOIN*)respbuf;
pkt->iID_NewMember = PlayerManager::getPlayer(member.sock)->iID;
@ -143,8 +143,8 @@ bool Groups::removeFromGroup(Group* group, EntityRef member) {
size_t pcCount = pcs.size();
size_t npcCount = npcs.size();
uint8_t respbuf[CN_PACKET_BUFFER_SIZE];
memset(respbuf, 0, CN_PACKET_BUFFER_SIZE);
uint8_t respbuf[CN_PACKET_BODY_SIZE];
memset(respbuf, 0, CN_PACKET_BODY_SIZE);
sP_FE2CL_PC_GROUP_LEAVE* pkt = (sP_FE2CL_PC_GROUP_LEAVE*)respbuf;
pkt->iID_LeaveMember = PlayerManager::getPlayer(member.sock)->iID;
@ -288,8 +288,8 @@ void Groups::groupTickInfo(CNSocket* sock) {
size_t pcCount = pcs.size();
size_t npcCount = npcs.size();
uint8_t respbuf[CN_PACKET_BUFFER_SIZE];
memset(respbuf, 0, CN_PACKET_BUFFER_SIZE);
uint8_t respbuf[CN_PACKET_BODY_SIZE];
memset(respbuf, 0, CN_PACKET_BODY_SIZE);
sP_FE2CL_PC_GROUP_MEMBER_INFO* pkt = (sP_FE2CL_PC_GROUP_MEMBER_INFO*)respbuf;
pkt->iID = plr->iID;

12
src/Items.cpp
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@ -46,7 +46,7 @@ static void nanoCapsuleHandler(CNSocket* sock, int slot, sItemBase *chest) {
// in order to remove capsule form inventory, we have to send item reward packet with empty item
const size_t resplen = sizeof(sP_FE2CL_REP_REWARD_ITEM) + sizeof(sItemReward);
assert(resplen < CN_PACKET_BUFFER_SIZE - 8);
assert(resplen < CN_PACKET_BODY_SIZE);
// we know it's only one trailing struct, so we can skip full validation
uint8_t respbuf[resplen]; // not a variable length array, don't worry
@ -475,8 +475,8 @@ static void itemUseHandler(CNSocket* sock, CNPacketData* data) {
if (gumball.iOpt == 0)
gumball = {};
uint8_t respbuf[CN_PACKET_BUFFER_SIZE];
memset(respbuf, 0, resplen);
uint8_t respbuf[CN_PACKET_BODY_SIZE];
memset(respbuf, 0, CN_PACKET_BODY_SIZE);
sP_FE2CL_REP_PC_ITEM_USE_SUCC *resp = (sP_FE2CL_REP_PC_ITEM_USE_SUCC*)respbuf;
sSkillResult_Buff *respdata = (sSkillResult_Buff*)(respbuf+sizeof(sP_FE2CL_NANO_SKILL_USE_SUCC));
@ -556,7 +556,7 @@ static void chestOpenHandler(CNSocket *sock, CNPacketData *data) {
// item giving packet
const size_t resplen = sizeof(sP_FE2CL_REP_REWARD_ITEM) + sizeof(sItemReward);
assert(resplen < CN_PACKET_BUFFER_SIZE - 8);
assert(resplen < CN_PACKET_BODY_SIZE);
// we know it's only one trailing struct, so we can skip full validation
uint8_t respbuf[resplen]; // not a variable length array, don't worry
@ -645,7 +645,7 @@ void Items::checkItemExpire(CNSocket* sock, Player* player) {
*/
const size_t resplen = sizeof(sP_FE2CL_PC_DELETE_TIME_LIMIT_ITEM) + sizeof(sTimeLimitItemDeleteInfo2CL);
assert(resplen < CN_PACKET_BUFFER_SIZE - 8);
assert(resplen < CN_PACKET_BODY_SIZE);
// we know it's only one trailing struct, so we can skip full validation
uint8_t respbuf[resplen]; // not a variable length array, don't worry
auto packet = (sP_FE2CL_PC_DELETE_TIME_LIMIT_ITEM*)respbuf;
@ -715,7 +715,7 @@ static void giveSingleDrop(CNSocket *sock, Mob* mob, int mobDropId, const DropRo
Player *plr = PlayerManager::getPlayer(sock);
const size_t resplen = sizeof(sP_FE2CL_REP_REWARD_ITEM) + sizeof(sItemReward);
assert(resplen < CN_PACKET_BUFFER_SIZE - 8);
assert(resplen < CN_PACKET_BODY_SIZE);
// we know it's only one trailing struct, so we can skip full validation
uint8_t respbuf[resplen]; // not a variable length array, don't worry

8
src/Missions.cpp
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@ -64,7 +64,7 @@ static bool isQuestItemFull(CNSocket* sock, int itemId, int itemCount) {
static void dropQuestItem(CNSocket *sock, int task, int count, int id, int mobid) {
std::cout << "Altered item id " << id << " by " << count << " for task id " << task << std::endl;
const size_t resplen = sizeof(sP_FE2CL_REP_REWARD_ITEM) + sizeof(sItemReward);
assert(resplen < CN_PACKET_BUFFER_SIZE);
assert(resplen < CN_PACKET_BODY_SIZE);
// we know it's only one trailing struct, so we can skip full validation
Player *plr = PlayerManager::getPlayer(sock);
@ -152,14 +152,14 @@ static int giveMissionReward(CNSocket *sock, int task, int choice=0) {
plr->Inven[slots[i]] = { 999, 999, 999, 0 }; // temp item; overwritten later
}
uint8_t respbuf[CN_PACKET_BUFFER_SIZE];
uint8_t respbuf[CN_PACKET_BODY_SIZE];
size_t resplen = sizeof(sP_FE2CL_REP_REWARD_ITEM) + nrewards * sizeof(sItemReward);
assert(resplen < CN_PACKET_BUFFER_SIZE);
assert(resplen < CN_PACKET_BODY_SIZE);
sP_FE2CL_REP_REWARD_ITEM *resp = (sP_FE2CL_REP_REWARD_ITEM *)respbuf;
sItemReward *item = (sItemReward *)(respbuf + sizeof(sP_FE2CL_REP_REWARD_ITEM));
// don't forget to zero the buffer!
memset(respbuf, 0, resplen);
memset(respbuf, 0, CN_PACKET_BODY_SIZE);
// update player
plr->money += reward->money;

4
src/MobAI.cpp
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@ -238,8 +238,8 @@ static void dealCorruption(Mob *mob, std::vector<int> targetData, int skillID, i
return;
}
uint8_t respbuf[CN_PACKET_BUFFER_SIZE];
memset(respbuf, 0, resplen);
uint8_t respbuf[CN_PACKET_BODY_SIZE];
memset(respbuf, 0, CN_PACKET_BODY_SIZE);
sP_FE2CL_NPC_SKILL_CORRUPTION_HIT *resp = (sP_FE2CL_NPC_SKILL_CORRUPTION_HIT*)respbuf;
sCAttackResult *respdata = (sCAttackResult*)(respbuf+sizeof(sP_FE2CL_NPC_SKILL_CORRUPTION_HIT));

8
src/core/CNProtocol.hpp
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@ -95,14 +95,14 @@ inline constexpr bool isOutboundPacketID(uint32_t id) {
// for outbound packets
inline constexpr bool validOutVarPacket(size_t base, size_t npayloads, size_t plsize) {
// check for multiplication overflow
if (npayloads > 0 && (CN_PACKET_BUFFER_SIZE - 8) / (size_t)npayloads < plsize)
if (npayloads > 0 && (CN_PACKET_BODY_SIZE) / (size_t)npayloads < plsize)
return false;
// it's safe to multiply
size_t trailing = npayloads * plsize;
// does it fit in a packet?
if (base + trailing > CN_PACKET_BUFFER_SIZE - 8)
if (base + trailing > CN_PACKET_BODY_SIZE)
return false;
// everything is a-ok!
@ -112,14 +112,14 @@ inline constexpr bool validOutVarPacket(size_t base, size_t npayloads, size_t pl
// for inbound packets
inline constexpr bool validInVarPacket(size_t base, size_t npayloads, size_t plsize, size_t datasize) {
// check for multiplication overflow
if (npayloads > 0 && (CN_PACKET_BUFFER_SIZE - 8) / (size_t)npayloads < plsize)
if (npayloads > 0 && CN_PACKET_BODY_SIZE / (size_t)npayloads < plsize)
return false;
// it's safe to multiply
size_t trailing = npayloads * plsize;
// make sure size is exact
// datasize has already been validated against CN_PACKET_BUFFER_SIZE
// datasize has already been validated against CN_PACKET_BODY_SIZE
if (datasize != base + trailing)
return false;

4
src/core/CNStructs.hpp
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@ -29,8 +29,8 @@
#define INITSTRUCT(T, x) T x; \
memset(&x, 0, sizeof(T));
#define INITVARPACKET(_buf, _Pkt, _pkt, _Trailer, _trailer) uint8_t _buf[CN_PACKET_BUFFER_SIZE]; \
memset(&_buf, 0, CN_PACKET_BUFFER_SIZE); \
#define INITVARPACKET(_buf, _Pkt, _pkt, _Trailer, _trailer) uint8_t _buf[CN_PACKET_BODY_SIZE]; \
memset(&_buf, 0, CN_PACKET_BODY_SIZE); \
auto _pkt = (_Pkt*)_buf; \
auto _trailer = (_Trailer*)(_pkt + 1);

5
src/core/Defines.hpp
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@ -934,3 +934,8 @@ enum {
N_PACKETS = N_CL2LS + N_CL2FE + N_FE2CL + N_LS2CL
};
/*
* Usable space in the packet buffer = CN_PACKET_BUFFER_SIZE - type - size
*/
constexpr size_t CN_PACKET_BODY_SIZE = CN_PACKET_BUFFER_SIZE - 2 * sizeof(int32_t);