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Rename message length headers and set payload max to 255 (#4827)

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* Rename message length headers and set payload max to 255

* Add MESHTASTIC_PKC_OVERHEAD

* compare to MESHTASTIC_HEADER_LENGTH

---------

Co-authored-by: Thomas Göttgens <tgoettgens@gmail.com>
This commit is contained in:
Jonathan Bennett 2024-09-23 09:20:32 -05:00 committed by GitHub
parent e8829b8f52
commit fa1cc59841
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GPG Key ID: B5690EEEBB952194
4 changed files with 14 additions and 13 deletions
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4
src/mesh/RadioInterface.cpp
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@ -151,7 +151,7 @@ const RegionInfo regions[] = {
const RegionInfo *myRegion; const RegionInfo *myRegion;
bool RadioInterface::uses_default_frequency_slot = true; bool RadioInterface::uses_default_frequency_slot = true;
static uint8_t bytes[MAX_RHPACKETLEN]; static uint8_t bytes[MAX_LORA_PAYLOAD_LEN + 1];
void initRegion() void initRegion()
{ {
@ -326,7 +326,7 @@ void printPacket(const char *prefix, const meshtastic_MeshPacket *p)
RadioInterface::RadioInterface() RadioInterface::RadioInterface()
{ {
assert(sizeof(PacketHeader) == 16); // make sure the compiler did what we expected assert(sizeof(PacketHeader) == MESHTASTIC_HEADER_LENGTH); // make sure the compiler did what we expected
} }
bool RadioInterface::reconfigure() bool RadioInterface::reconfigure()

7
src/mesh/RadioInterface.h
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@ -9,8 +9,9 @@
#define MAX_TX_QUEUE 16 // max number of packets which can be waiting for transmission #define MAX_TX_QUEUE 16 // max number of packets which can be waiting for transmission
#define MAX_RHPACKETLEN 256 #define MAX_LORA_PAYLOAD_LEN 255 // max length of 255 per Semtech's datasheets on SX12xx
#define LORA_HEADER_LENGTH 16 #define MESHTASTIC_HEADER_LENGTH 16
#define MESHTASTIC_PKC_OVERHEAD 12
#define PACKET_FLAGS_HOP_LIMIT_MASK 0x07 #define PACKET_FLAGS_HOP_LIMIT_MASK 0x07
#define PACKET_FLAGS_WANT_ACK_MASK 0x08 #define PACKET_FLAGS_WANT_ACK_MASK 0x08
@ -90,7 +91,7 @@ class RadioInterface
/** /**
* A temporary buffer used for sending/receiving packets, sized to hold the biggest buffer we might need * A temporary buffer used for sending/receiving packets, sized to hold the biggest buffer we might need
* */ * */
uint8_t radiobuf[MAX_RHPACKETLEN]; uint8_t radiobuf[MAX_LORA_PAYLOAD_LEN + 1];
/** /**
* Enqueue a received packet for the registered receiver * Enqueue a received packet for the registered receiver

14
src/mesh/Router.cpp
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@ -36,8 +36,8 @@ static MemoryDynamic<meshtastic_MeshPacket> staticPool;
Allocator<meshtastic_MeshPacket> &packetPool = staticPool; Allocator<meshtastic_MeshPacket> &packetPool = staticPool;
static uint8_t bytes[MAX_RHPACKETLEN]; static uint8_t bytes[MAX_LORA_PAYLOAD_LEN + 1];
static uint8_t ScratchEncrypted[MAX_RHPACKETLEN]; static uint8_t ScratchEncrypted[MAX_LORA_PAYLOAD_LEN + 1];
/** /**
* Constructor * Constructor
@ -330,13 +330,13 @@ bool perhapsDecode(meshtastic_MeshPacket *p)
// Attempt PKI decryption first // Attempt PKI decryption first
if (p->channel == 0 && p->to == nodeDB->getNodeNum() && p->to > 0 && p->to != NODENUM_BROADCAST && if (p->channel == 0 && p->to == nodeDB->getNodeNum() && p->to > 0 && p->to != NODENUM_BROADCAST &&
nodeDB->getMeshNode(p->from) != nullptr && nodeDB->getMeshNode(p->from)->user.public_key.size > 0 && nodeDB->getMeshNode(p->from) != nullptr && nodeDB->getMeshNode(p->from)->user.public_key.size > 0 &&
nodeDB->getMeshNode(p->to)->user.public_key.size > 0 && rawSize > 12) { nodeDB->getMeshNode(p->to)->user.public_key.size > 0 && rawSize > MESHTASTIC_PKC_OVERHEAD) {
LOG_DEBUG("Attempting PKI decryption\n"); LOG_DEBUG("Attempting PKI decryption\n");
if (crypto->decryptCurve25519(p->from, p->id, rawSize, ScratchEncrypted, bytes)) { if (crypto->decryptCurve25519(p->from, p->id, rawSize, ScratchEncrypted, bytes)) {
LOG_INFO("PKI Decryption worked!\n"); LOG_INFO("PKI Decryption worked!\n");
memset(&p->decoded, 0, sizeof(p->decoded)); memset(&p->decoded, 0, sizeof(p->decoded));
rawSize -= 12; rawSize -= MESHTASTIC_PKC_OVERHEAD;
if (pb_decode_from_bytes(bytes, rawSize, &meshtastic_Data_msg, &p->decoded) && if (pb_decode_from_bytes(bytes, rawSize, &meshtastic_Data_msg, &p->decoded) &&
p->decoded.portnum != meshtastic_PortNum_UNKNOWN_APP) { p->decoded.portnum != meshtastic_PortNum_UNKNOWN_APP) {
decrypted = true; decrypted = true;
@ -475,7 +475,7 @@ meshtastic_Routing_Error perhapsEncode(meshtastic_MeshPacket *p)
} }
} */ } */
if (numbytes + LORA_HEADER_LENGTH > MAX_RHPACKETLEN) if (numbytes + MESHTASTIC_HEADER_LENGTH > MAX_LORA_PAYLOAD_LEN)
return meshtastic_Routing_Error_TOO_LARGE; return meshtastic_Routing_Error_TOO_LARGE;
// printBytes("plaintext", bytes, numbytes); // printBytes("plaintext", bytes, numbytes);
@ -499,7 +499,7 @@ meshtastic_Routing_Error perhapsEncode(meshtastic_MeshPacket *p)
p->decoded.portnum != meshtastic_PortNum_TRACEROUTE_APP && p->decoded.portnum != meshtastic_PortNum_NODEINFO_APP && p->decoded.portnum != meshtastic_PortNum_TRACEROUTE_APP && p->decoded.portnum != meshtastic_PortNum_NODEINFO_APP &&
p->decoded.portnum != meshtastic_PortNum_ROUTING_APP && p->decoded.portnum != meshtastic_PortNum_POSITION_APP) { p->decoded.portnum != meshtastic_PortNum_ROUTING_APP && p->decoded.portnum != meshtastic_PortNum_POSITION_APP) {
LOG_DEBUG("Using PKI!\n"); LOG_DEBUG("Using PKI!\n");
if (numbytes + LORA_HEADER_LENGTH + 12 > MAX_RHPACKETLEN) if (numbytes + MESHTASTIC_HEADER_LENGTH + MESHTASTIC_PKC_OVERHEAD > MAX_LORA_PAYLOAD_LEN)
return meshtastic_Routing_Error_TOO_LARGE; return meshtastic_Routing_Error_TOO_LARGE;
if (p->pki_encrypted && !memfll(p->public_key.bytes, 0, 32) && if (p->pki_encrypted && !memfll(p->public_key.bytes, 0, 32) &&
memcmp(p->public_key.bytes, node->user.public_key.bytes, 32) != 0) { memcmp(p->public_key.bytes, node->user.public_key.bytes, 32) != 0) {
@ -508,7 +508,7 @@ meshtastic_Routing_Error perhapsEncode(meshtastic_MeshPacket *p)
return meshtastic_Routing_Error_PKI_FAILED; return meshtastic_Routing_Error_PKI_FAILED;
} }
crypto->encryptCurve25519(p->to, getFrom(p), p->id, numbytes, bytes, ScratchEncrypted); crypto->encryptCurve25519(p->to, getFrom(p), p->id, numbytes, bytes, ScratchEncrypted);
numbytes += 12; numbytes += MESHTASTIC_PKC_OVERHEAD;
memcpy(p->encrypted.bytes, ScratchEncrypted, numbytes); memcpy(p->encrypted.bytes, ScratchEncrypted, numbytes);
p->channel = 0; p->channel = 0;
p->pki_encrypted = true; p->pki_encrypted = true;

2
src/modules/RangeTestModule.cpp
View File

@ -115,7 +115,7 @@ void RangeTestModuleRadio::sendPayload(NodeNum dest, bool wantReplies)
packetSequence++; packetSequence++;
static char heartbeatString[MAX_RHPACKETLEN]; static char heartbeatString[MAX_LORA_PAYLOAD_LEN + 1];
snprintf(heartbeatString, sizeof(heartbeatString), "seq %u", packetSequence); snprintf(heartbeatString, sizeof(heartbeatString), "seq %u", packetSequence);
p->decoded.payload.size = strlen(heartbeatString); // You must specify how many bytes are in the reply p->decoded.payload.size = strlen(heartbeatString); // You must specify how many bytes are in the reply