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tolerate cut off packets & fix wifilist parsing

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This commit is contained in:
David Ventura
2024-05-06 16:52:46 +02:00
parent 7b9d8fb5b7
commit 0db9cfd198
1 changed files with 17 additions and 9 deletions
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handlers.ts
+17 -9
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@@ -45,7 +45,11 @@ export const makeP2pRdy = (dev: DevSerial): DataView => {
export const createResponseForControlCommand = (session: Session, dv: DataView): DataView[] => {
const start_type = dv.add(8).readU16(); // 0xa11 on control; data starts here on DATA pkt
const cmd_id = dv.add(10).readU16(); // 0x1120
const payload_len = u16_swap(dv.add(0xc).readU16());
let payload_len = u16_swap(dv.add(0xc).readU16());
if (dv.byteLength > 20 && payload_len > dv.byteLength) {
logger.warning(`Received a cropped payload: ${payload_len} when packet is ${dv.byteLength}`);
payload_len = dv.byteLength - 20;
}
if (start_type != 0x110a) {
logger.error(`Expected start_type to be 0xa11, got 0x${start_type.toString(16)}`);
@@ -99,27 +103,31 @@ export const createResponseForControlCommand = (session: Session, dv: DataView):
logger.debug("ListWifi returned []");
return [];
}
logger.log("trace", `payload len ${dv.byteLength}`);
let startat = 0x10;
let msg_len = 91;
let msg_count = (payload_len - 9) / msg_len;
let remote_msg_count = dv.add(startat).readU32LE();
logger.debug(`should get messages: ${msg_count} in payload: ${remote_msg_count}`);
const msg_len = 0x5c; // 0x58 + 0x4 of the last u32
const msg_count = dv.add(startat).readU32LE();
logger.log("trace", `should get messages: ${msg_count} in payload`);
startat += 4;
let items = [];
for (let i = 0; i < msg_count; i++) {
logger.log("trace", `start parsing ${i} at ${startat} - 0x${startat.toString(16)}`);
if (startat + msg_len > dv.byteLength) {
logger.warning("Wifi listing got cropped");
break;
}
const wifiListItem = {
// startat = msg_len * i + 0x14;
ssid: dv.add(startat).readString(0x40),
mac: dv.add(startat + 0x40).readByteArray(8),
mac: dv.add(startat + 0x40).readByteArray(8).buffer,
security: dv.add(startat + 0x48).readU32LE(),
dbm0: dv.add(startat + 0x4c).readU32LE(),
dbm1: dv.add(startat + 0x50).readU32LE(),
mode: dv.add(startat + 0x54).readU32LE(),
channel: dv.add(startat + 0x58).readU32LE(),
};
logger.info(`Wifi Item: ${JSON.stringify(wifiListItem, null, 2)}`);
logger.debug(`Wifi Item: ${JSON.stringify(wifiListItem, null, 2)}`);
startat += msg_len;
logger.debug("ended at", startat);
logger.log("trace", `ended at ${startat} - 0x${startat.toString(16)}`);
items.push(wifiListItem);
}
return [];