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fix: Align channel data framing

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ref: #1928
This commit is contained in:
Janez T
2026-03-18 20:14:22 +01:00
parent a21b83b127
commit f25d7a882a
5 changed files with 63 additions and 56 deletions
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src/MeshCore.h
+1 -1
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@@ -17,7 +17,7 @@
#define PATH_HASH_SIZE 1
#define MAX_PACKET_PAYLOAD 184
#define MAX_GROUP_DATA_LENGTH (MAX_PACKET_PAYLOAD - CIPHER_BLOCK_SIZE - 5)
#define MAX_GROUP_DATA_LENGTH (MAX_PACKET_PAYLOAD - CIPHER_BLOCK_SIZE - 6)
#define MAX_PATH_SIZE 64
#define MAX_TRANS_UNIT 255
src/Packet.h
+1 -1
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@@ -22,7 +22,7 @@ namespace mesh {
#define PAYLOAD_TYPE_ACK 0x03 // a simple ack
#define PAYLOAD_TYPE_ADVERT 0x04 // a node advertising its Identity
#define PAYLOAD_TYPE_GRP_TXT 0x05 // an (unverified) group text message (prefixed with channel hash, MAC) (enc data: timestamp, "name: msg")
#define PAYLOAD_TYPE_GRP_DATA 0x06 // an (unverified) group datagram (prefixed with channel hash, MAC) (enc data: timestamp, blob)
#define PAYLOAD_TYPE_GRP_DATA 0x06 // an (unverified) group datagram (prefixed with channel hash, MAC) (enc data: timestamp, data_type, data_len, blob)
#define PAYLOAD_TYPE_ANON_REQ 0x07 // generic request (prefixed with dest_hash, ephemeral pub_key, MAC) (enc data: ...)
#define PAYLOAD_TYPE_PATH 0x08 // returned path (prefixed with dest/src hashes, MAC) (enc data: path, extra)
#define PAYLOAD_TYPE_TRACE 0x09 // trace a path, collecting SNI for each hop
src/helpers/BaseChatMesh.cpp
+28 -12
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@@ -353,15 +353,15 @@ int BaseChatMesh::searchChannelsByHash(const uint8_t* hash, mesh::GroupChannel d
#endif
void BaseChatMesh::onGroupDataRecv(mesh::Packet* packet, uint8_t type, const mesh::GroupChannel& channel, uint8_t* data, size_t len) {
if (len < 5) {
MESH_DEBUG_PRINTLN("onGroupDataRecv: dropping short group payload len=%d", (uint32_t)len);
return;
}
uint8_t data_type = data[4];
if (type == PAYLOAD_TYPE_GRP_TXT) {
if ((data_type >> 2) != 0) {
MESH_DEBUG_PRINTLN("onGroupDataRecv: dropping unsupported group text type=%d", (uint32_t)data_type);
if (len < 5) {
MESH_DEBUG_PRINTLN("onGroupDataRecv: dropping short group text payload len=%d", (uint32_t)len);
return;
}
uint8_t txt_type = data[4];
if ((txt_type >> 2) != 0) {
MESH_DEBUG_PRINTLN("onGroupDataRecv: dropping unsupported group text type=%d", (uint32_t)txt_type);
return;
}
@@ -374,9 +374,24 @@ void BaseChatMesh::onGroupDataRecv(mesh::Packet* packet, uint8_t type, const mes
// notify UI of this new message
onChannelMessageRecv(channel, packet, timestamp, (const char *) &data[5]); // let UI know
} else if (type == PAYLOAD_TYPE_GRP_DATA) {
if (len < 6) {
MESH_DEBUG_PRINTLN("onGroupDataRecv: dropping short group data payload len=%d", (uint32_t)len);
return;
}
uint32_t timestamp;
memcpy(&timestamp, data, 4);
onChannelDataRecv(channel, packet, timestamp, data_type, &data[5], len - 5);
uint8_t data_type = data[4];
uint8_t data_len = data[5];
size_t available_len = len - 6;
if (data_len > available_len) {
MESH_DEBUG_PRINTLN("onGroupDataRecv: dropping malformed group data type=%d len=%d available=%d",
(uint32_t)data_type, (uint32_t)data_len, (uint32_t)available_len);
return;
}
onChannelDataRecv(channel, packet, timestamp, data_type, &data[6], data_len);
}
}
@@ -478,12 +493,13 @@ bool BaseChatMesh::sendGroupData(uint32_t timestamp, mesh::GroupChannel& channel
return false;
}
uint8_t temp[5 + MAX_GROUP_DATA_LENGTH];
uint8_t temp[6 + MAX_GROUP_DATA_LENGTH];
memcpy(temp, &timestamp, 4);
temp[4] = data_type;
if (data_len > 0) memcpy(&temp[5], data, data_len);
temp[5] = (uint8_t)data_len;
if (data_len > 0) memcpy(&temp[6], data, data_len);
auto pkt = createGroupDatagram(PAYLOAD_TYPE_GRP_DATA, channel, temp, 5 + data_len);
auto pkt = createGroupDatagram(PAYLOAD_TYPE_GRP_DATA, channel, temp, 6 + data_len);
if (pkt == NULL) {
MESH_DEBUG_PRINTLN("sendGroupData: unable to create group datagram, data_len=%d", data_len);
return false;