/*
* Recursively convert binary log data to printable form.
*
* This needs to be recursive because you can have lists of lists.
*
* If we run out of room, we stop processing immediately. It's important
* for us to check for space on every output element to avoid producing
* garbled output.
*
* Returns 0 on success, 1 on buffer full, -1 on failure.
*/
static int android_log_printBinaryEvent(const unsigned char** pEventData,
size_t* pEventDataLen, char** pOutBuf, size_t* pOutBufLen)
{
const unsigned char* eventData = *pEventData;
size_t eventDataLen = *pEventDataLen;
char* outBuf = *pOutBuf;
size_t outBufLen = *pOutBufLen;
unsigned char type;
size_t outCount;
int result = 0;
if (eventDataLen < 1)
return -1;
type = *eventData++;
eventDataLen--;
//fprintf(stderr, "--- type=%d (rem len=%d)\n", type, eventDataLen);
switch (type) {
case EVENT_TYPE_INT:
/* 32-bit signed int */
{
int ival;
if (eventDataLen < 4)
return -1;
ival = get4LE(eventData);
eventData += 4;
eventDataLen -= 4;
outCount = snprintf(outBuf, outBufLen, "%d", ival);
if (outCount < outBufLen) {
outBuf += outCount;
outBufLen -= outCount;
} else {
/* halt output */
goto no_room;
}
}
break;
case EVENT_TYPE_LONG:
/* 64-bit signed long */
{
long long lval;
if (eventDataLen < 8)
return -1;
lval = get8LE(eventData);
eventData += 8;
eventDataLen -= 8;
outCount = snprintf(outBuf, outBufLen, "%lld", lval);
if (outCount < outBufLen) {
outBuf += outCount;
outBufLen -= outCount;
} else {
/* halt output */
goto no_room;
}
}
break;
case EVENT_TYPE_STRING:
/* UTF-8 chars, not NULL-terminated */
{
unsigned int strLen;
if (eventDataLen < 4)
return -1;
strLen = get4LE(eventData);
eventData += 4;
eventDataLen -= 4;
if (eventDataLen < strLen)
return -1;
if (strLen < outBufLen) {
memcpy(outBuf, eventData, strLen);
outBuf += strLen;
outBufLen -= strLen;
} else if (outBufLen > 0) {
/* copy what we can */
memcpy(outBuf, eventData, outBufLen);
outBuf += outBufLen;
outBufLen -= outBufLen;
goto no_room;
}
eventData += strLen;
eventDataLen -= strLen;
break;
}
case EVENT_TYPE_LIST:
/* N items, all different types */
{
unsigned char count;
int i;
if (eventDataLen < 1)
return -1;
count = *eventData++;
eventDataLen--;
if (outBufLen > 0) {
*outBuf++ = '[';
outBufLen--;
} else {
goto no_room;
}
for (i = 0; i < count; i++) {
result = android_log_printBinaryEvent(&eventData, &eventDataLen,
&outBuf, &outBufLen);
if (result != 0)
goto bail;
if (i < count-1) {
if (outBufLen > 0) {
*outBuf++ = ',';
outBufLen--;
} else {
goto no_room;
}
}
}
if (outBufLen > 0) {
*outBuf++ = ']';
outBufLen--;
} else {
goto no_room;
}
}
break;
default:
fprintf(stderr, "Unknown binary event type %d\n", type);
return -1;
}
bail:
*pEventData = eventData;
*pEventDataLen = eventDataLen;
*pOutBuf = outBuf;
*pOutBufLen = outBufLen;
return result;
no_room:
result = 1;
goto bail;
}
/**
* Convert a binary log entry to ASCII form.
*
* For convenience we mimic the processLogBuffer API. There is no
* pre-defined output length for the binary data, since we're free to format
* it however we choose, which means we can't really use a fixed-size buffer
* here.
*/
int android_log_processBinaryLogBuffer(struct logger_entry *buf,
AndroidLogEntry *entry, const EventTagMap* map, char* messageBuf,
int messageBufLen)
{
size_t inCount;
unsigned int tagIndex;
const unsigned char* eventData;
entry->tv_sec = buf->sec;
entry->tv_nsec = buf->nsec;
entry->priority = ANDROID_LOG_INFO;
entry->pid = buf->pid;
entry->tid = buf->tid;
/*
* Pull the tag out.
*/
eventData = (const unsigned char*) buf->msg;
inCount = buf->len;
if (inCount < 4)
return -1;
tagIndex = get4LE(eventData);
eventData += 4;
inCount -= 4;
if (map != NULL) {
entry->tag = android_lookupEventTag(map, tagIndex);
} else {
entry->tag = NULL;
}
/*
* If we don't have a map, or didn't find the tag number in the map,
* stuff a generated tag value into the start of the output buffer and
* shift the buffer pointers down.
*/
if (entry->tag == NULL) {
int tagLen;
tagLen = snprintf(messageBuf, messageBufLen, "[%d]", tagIndex);
entry->tag = messageBuf;
messageBuf += tagLen+1;
messageBufLen -= tagLen+1;
}
/*
* Format the event log data into the buffer.
*/
char* outBuf = messageBuf;
size_t outRemaining = messageBufLen-1; /* leave one for nul byte */
int result;
result = android_log_printBinaryEvent(&eventData, &inCount, &outBuf,
&outRemaining);
if (result < 0) {
fprintf(stderr, "Binary log entry conversion failed\n");
return -1;
} else if (result == 1) {
if (outBuf > messageBuf) {
/* leave an indicator */
*(outBuf-1) = '!';
} else {
/* no room to output anything at all */
*outBuf++ = '!';
outRemaining--;
}
/* pretend we ate all the data */
inCount = 0;
}
/* eat the silly terminating '\n' */
if (inCount == 1 && *eventData == '\n') {
eventData++;
inCount--;
}
if (inCount != 0) {
fprintf(stderr,
"Warning: leftover binary log data (%zu bytes)\n", inCount);
}
/*
* Terminate the buffer. The NUL byte does not count as part of
* entry->messageLen.
*/
*outBuf = '\0';
entry->messageLen = outBuf - messageBuf;
assert(entry->messageLen == (messageBufLen-1) - outRemaining);
entry->message = messageBuf;
return 0;
}
/**
* Convert a binary log entry to ASCII form.
*
* For convenience we mimic the processLogBuffer API. There is no
* pre-defined output length for the binary data, since we're free to format
* it however we choose, which means we can't really use a fixed-size buffer
* here.
*/
LIBLOG_ABI_PUBLIC int android_log_processBinaryLogBuffer(
struct logger_entry *buf,
AndroidLogEntry *entry,
const EventTagMap *map,
char *messageBuf, int messageBufLen)
{
size_t inCount;
unsigned int tagIndex;
const unsigned char* eventData;
entry->tv_sec = buf->sec;
entry->tv_nsec = buf->nsec;
entry->priority = ANDROID_LOG_INFO;
entry->uid = -1;
entry->pid = buf->pid;
entry->tid = buf->tid;
/*
* Pull the tag out, fill in some additional details based on incoming
* buffer version (v3 adds lid, v4 adds uid).
*/
eventData = (const unsigned char*) buf->msg;
struct logger_entry_v2 *buf2 = (struct logger_entry_v2 *)buf;
if (buf2->hdr_size) {
if ((buf2->hdr_size < sizeof(((struct log_msg *)NULL)->entry_v1)) ||
(buf2->hdr_size > sizeof(((struct log_msg *)NULL)->entry))) {
fprintf(stderr, "+++ LOG: entry illegal hdr_size\n");
return -1;
}
eventData = ((unsigned char *)buf2) + buf2->hdr_size;
if ((buf2->hdr_size >= sizeof(struct logger_entry_v3)) &&
(((struct logger_entry_v3 *)buf)->lid == LOG_ID_SECURITY)) {
entry->priority = ANDROID_LOG_WARN;
}
if (buf2->hdr_size >= sizeof(struct logger_entry_v4)) {
entry->uid = ((struct logger_entry_v4 *)buf)->uid;
}
}
inCount = buf->len;
if (inCount < 4)
return -1;
tagIndex = get4LE(eventData);
eventData += 4;
inCount -= 4;
entry->tagLen = 0;
if (map != NULL) {
entry->tag = android_lookupEventTag_len(map, &entry->tagLen, tagIndex);
} else {
entry->tag = NULL;
}
/*
* If we don't have a map, or didn't find the tag number in the map,
* stuff a generated tag value into the start of the output buffer and
* shift the buffer pointers down.
*/
if (entry->tag == NULL) {
size_t tagLen;
tagLen = snprintf(messageBuf, messageBufLen, "[%d]", tagIndex);
if (tagLen >= (size_t)messageBufLen) {
tagLen = messageBufLen - 1;
}
entry->tag = messageBuf;
entry->tagLen = tagLen;
messageBuf += tagLen + 1;
messageBufLen -= tagLen + 1;
}
/*
* Format the event log data into the buffer.
*/
char* outBuf = messageBuf;
size_t outRemaining = messageBufLen-1; /* leave one for nul byte */
int result;
result = android_log_printBinaryEvent(&eventData, &inCount, &outBuf,
&outRemaining);
if (result < 0) {
fprintf(stderr, "Binary log entry conversion failed\n");
return -1;
} else if (result == 1) {
if (outBuf > messageBuf) {
/* leave an indicator */
*(outBuf-1) = '!';
} else {
/* no room to output anything at all */
*outBuf++ = '!';
outRemaining--;
}
/* pretend we ate all the data */
inCount = 0;
}
/* eat the silly terminating '\n' */
if (inCount == 1 && *eventData == '\n') {
eventData++;
inCount--;
}
if (inCount != 0) {
fprintf(stderr,
"Warning: leftover binary log data (%zu bytes)\n", inCount);
}
/*
* Terminate the buffer. The NUL byte does not count as part of
* entry->messageLen.
*/
*outBuf = '\0';
entry->messageLen = outBuf - messageBuf;
assert(entry->messageLen == (messageBufLen-1) - outRemaining);
entry->message = messageBuf;
return 0;
}
