A Wireshark dissector for the Apple Remote Invocation (ARI) protocol, used between Intel base band chips and the iOS CommCenter for various management purposes, SMS, telephony and much more.
License: MIT License
The group field's tvbrange does not indicate that it stretches across two bytes.
In libARI.dylib on iOS 14.3 there is virtual field in the ARI header called the "GMID". It consists of the group field and type field concatenated in the following manor:
GMID = Group ID || 0 || Type ID || 000000000000000
See the following frida script for more information. I uses the AriMsg::GetBufGmid(uint32_t * buf, uint32_t len) function:
// GMID = GID || 0 || MID || 000000000000000; Proof
var getBufGmidPtr = Module.getExportByName("libARI.dylib", "_ZN6AriMsg10GetBufGmidEPKhm");
var getBufGmidFun = new NativeFunction(
getBufGmidPtr,
'uint32',
['pointer', 'int32']);
var payloadBuf = Memory.alloc(12);
var ari = [0xde, 0xc0, 0x7e, 0xab, 0xF8, 0x01, 0x00, 0x00, 0xc0, 0xFF, 0x00, 0x00];
Memory.writeByteArray(payloadBuf, ari);
var a = getBufGmidFun(payloadBuf, ari.length);
ari = [0xde, 0xc0, 0x7e, 0xab, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF];
Memory.writeByteArray(payloadBuf, ari);
var b = getBufGmidFun(payloadBuf, ari.length);
var c = 0xfdff8000; // === (0x3f << 26) | (0x03ff << 15)
a === b && b === c;Field names in the dissector differ from log strings and function signatures in libARI.dylib. This may be relevant and should probably be documented. Examples:
| ARIstoteles | libARI.dylib |
|---|---|
| Group | gid or just g |
| Type id | mid or just m |
| ID (TLVs) | tid |
| Transaction | Either ctx (context) or trx (transaction). |
Sample log strings:
(%s:%d) trying to pack gid(%d) mid(0x%03x) tid(%d) with sz(%zu) > max size(%zu)
(%s:%d) trying to pack gid(%d) mid(0x%03x) tid(%d) with sz(%zu) not multiple of element sz(%zu)
(%s:%d) UNKNOWN tlv with g(%d) m(0x%03x) tid(%d), ignored
(%s:%d) canceling ctx 0x%x gmid 0x%x %s
(%s:%d) Client (0x%x) cancelTrx(0x%x) done
Symbols for functions:
| Symbol (frida) | Function signature |
|---|---|
_ZN6AriMsg9GetBufGidEPKhm |
AriMsg::GetBufGid(uint32_t * buf, uint64_t len) |
_ZN6AriMsg9GetBufMidEPKhm |
AriMsg::GetBufMid(uint32_t * buf, uint64_t len) |
_ZN6AriMsg9GetBufCtxEPKhm |
AriMsg::GetBufCtx(uint32_t * buf, uint64_t len) |
When analyzing libARI.dylib there is a function that parses an acknowledgement option or flag from a given ARI header (AriMsg::GetBufAckOpt(uint32_t * buf, uint32_t len)). The option is the 4th bit of the 8th byte. Please see the attached frida script:
// ACK Option = Byte 8, Bit 4
var getAckOptPtr = Module.getExportByName("libARI.dylib", "_ZN6AriMsg12GetBufAckOptEPKhm");
var getAckOptFun = new NativeFunction(
getAckOptPtr,
'uint32',
['pointer', 'int32']);
var payloadBuf = Memory.alloc(12);
var ari = [0xde, 0xc0, 0x7e, 0xab, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00];
Memory.writeByteArray(payloadBuf, ari);
var a = getAckOptFun(payloadBuf, ari.length);
ari = [0xde, 0xc0, 0x7e, 0xab, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF];
Memory.writeByteArray(payloadBuf, ari);
var b = getAckOptFun(payloadBuf, ari.length);
a === b;Bit 7 in Byte 5 is already part of the group field. Remove the bit from the list of unknown bits.
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