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platform_system_core/liblog/logprint.c
Mark Salyzyn 476b771bda liblog: logprint: deal with malformed log messages 
(cherry picked from commit 083c53462a)

Try to print as much content as possible should the application
logging only submit content as part of a tag with an empty message.
We search for the first non-printable ascii character in the tag, in
order to split it up for printing.

Applications (such as com.yahoo.mobile.client.android.weather) that
malform their log messages will no longer be punished by truncating
the content, but this should never be considered advocacy for their
bad behavior.

Bug: 27585978
Change-Id: Idb0680e8d6a6ad2bef5150661905acccb5b70afb
2016-03-24 12:21:53 -07:00

1593 lines
48 KiB
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/*
**
** Copyright 2006-2014, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#define _GNU_SOURCE /* for asprintf */
#include <arpa/inet.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <sys/param.h>
#include <cutils/list.h>
#include <log/logd.h>
#include <log/logprint.h>
#include <private/android_filesystem_config.h>
#include "log_portability.h"
#define MS_PER_NSEC 1000000
#define US_PER_NSEC 1000
typedef struct FilterInfo_t {
char *mTag;
android_LogPriority mPri;
struct FilterInfo_t *p_next;
} FilterInfo;
struct AndroidLogFormat_t {
android_LogPriority global_pri;
FilterInfo *filters;
AndroidLogPrintFormat format;
bool colored_output;
bool usec_time_output;
bool printable_output;
bool year_output;
bool zone_output;
bool epoch_output;
bool monotonic_output;
bool uid_output;
};
/*
* gnome-terminal color tags
* See http://misc.flogisoft.com/bash/tip_colors_and_formatting
* for ideas on how to set the forground color of the text for xterm.
* The color manipulation character stream is defined as:
* ESC [ 3 8 ; 5 ; <color#> m
*/
#define ANDROID_COLOR_BLUE 75
#define ANDROID_COLOR_DEFAULT 231
#define ANDROID_COLOR_GREEN 40
#define ANDROID_COLOR_ORANGE 166
#define ANDROID_COLOR_RED 196
#define ANDROID_COLOR_YELLOW 226
static FilterInfo * filterinfo_new(const char * tag, android_LogPriority pri)
{
FilterInfo *p_ret;
p_ret = (FilterInfo *)calloc(1, sizeof(FilterInfo));
p_ret->mTag = strdup(tag);
p_ret->mPri = pri;
return p_ret;
}
/* balance to above, filterinfo_free left unimplemented */
/*
* Note: also accepts 0-9 priorities
* returns ANDROID_LOG_UNKNOWN if the character is unrecognized
*/
static android_LogPriority filterCharToPri (char c)
{
android_LogPriority pri;
c = tolower(c);
if (c >= '0' && c <= '9') {
if (c >= ('0'+ANDROID_LOG_SILENT)) {
pri = ANDROID_LOG_VERBOSE;
} else {
pri = (android_LogPriority)(c - '0');
}
} else if (c == 'v') {
pri = ANDROID_LOG_VERBOSE;
} else if (c == 'd') {
pri = ANDROID_LOG_DEBUG;
} else if (c == 'i') {
pri = ANDROID_LOG_INFO;
} else if (c == 'w') {
pri = ANDROID_LOG_WARN;
} else if (c == 'e') {
pri = ANDROID_LOG_ERROR;
} else if (c == 'f') {
pri = ANDROID_LOG_FATAL;
} else if (c == 's') {
pri = ANDROID_LOG_SILENT;
} else if (c == '*') {
pri = ANDROID_LOG_DEFAULT;
} else {
pri = ANDROID_LOG_UNKNOWN;
}
return pri;
}
static char filterPriToChar (android_LogPriority pri)
{
switch (pri) {
case ANDROID_LOG_VERBOSE: return 'V';
case ANDROID_LOG_DEBUG: return 'D';
case ANDROID_LOG_INFO: return 'I';
case ANDROID_LOG_WARN: return 'W';
case ANDROID_LOG_ERROR: return 'E';
case ANDROID_LOG_FATAL: return 'F';
case ANDROID_LOG_SILENT: return 'S';
case ANDROID_LOG_DEFAULT:
case ANDROID_LOG_UNKNOWN:
default: return '?';
}
}
static int colorFromPri (android_LogPriority pri)
{
switch (pri) {
case ANDROID_LOG_VERBOSE: return ANDROID_COLOR_DEFAULT;
case ANDROID_LOG_DEBUG: return ANDROID_COLOR_BLUE;
case ANDROID_LOG_INFO: return ANDROID_COLOR_GREEN;
case ANDROID_LOG_WARN: return ANDROID_COLOR_ORANGE;
case ANDROID_LOG_ERROR: return ANDROID_COLOR_RED;
case ANDROID_LOG_FATAL: return ANDROID_COLOR_RED;
case ANDROID_LOG_SILENT: return ANDROID_COLOR_DEFAULT;
case ANDROID_LOG_DEFAULT:
case ANDROID_LOG_UNKNOWN:
default: return ANDROID_COLOR_DEFAULT;
}
}
static android_LogPriority filterPriForTag(
AndroidLogFormat *p_format, const char *tag)
{
FilterInfo *p_curFilter;
for (p_curFilter = p_format->filters
; p_curFilter != NULL
; p_curFilter = p_curFilter->p_next
) {
if (0 == strcmp(tag, p_curFilter->mTag)) {
if (p_curFilter->mPri == ANDROID_LOG_DEFAULT) {
return p_format->global_pri;
} else {
return p_curFilter->mPri;
}
}
}
return p_format->global_pri;
}
/**
* returns 1 if this log line should be printed based on its priority
* and tag, and 0 if it should not
*/
LIBLOG_ABI_PUBLIC int android_log_shouldPrintLine (
AndroidLogFormat *p_format,
const char *tag,
android_LogPriority pri)
{
return pri >= filterPriForTag(p_format, tag);
}
LIBLOG_ABI_PUBLIC AndroidLogFormat *android_log_format_new()
{
AndroidLogFormat *p_ret;
p_ret = calloc(1, sizeof(AndroidLogFormat));
p_ret->global_pri = ANDROID_LOG_VERBOSE;
p_ret->format = FORMAT_BRIEF;
p_ret->colored_output = false;
p_ret->usec_time_output = false;
p_ret->printable_output = false;
p_ret->year_output = false;
p_ret->zone_output = false;
p_ret->epoch_output = false;
p_ret->monotonic_output = android_log_clockid() == CLOCK_MONOTONIC;
p_ret->uid_output = false;
return p_ret;
}
static list_declare(convertHead);
LIBLOG_ABI_PUBLIC void android_log_format_free(AndroidLogFormat *p_format)
{
FilterInfo *p_info, *p_info_old;
p_info = p_format->filters;
while (p_info != NULL) {
p_info_old = p_info;
p_info = p_info->p_next;
free(p_info_old);
}
free(p_format);
/* Free conversion resource, can always be reconstructed */
while (!list_empty(&convertHead)) {
struct listnode *node = list_head(&convertHead);
list_remove(node);
free(node);
}
}
LIBLOG_ABI_PUBLIC int android_log_setPrintFormat(
AndroidLogFormat *p_format,
AndroidLogPrintFormat format)
{
switch (format) {
case FORMAT_MODIFIER_COLOR:
p_format->colored_output = true;
return 0;
case FORMAT_MODIFIER_TIME_USEC:
p_format->usec_time_output = true;
return 0;
case FORMAT_MODIFIER_PRINTABLE:
p_format->printable_output = true;
return 0;
case FORMAT_MODIFIER_YEAR:
p_format->year_output = true;
return 0;
case FORMAT_MODIFIER_ZONE:
p_format->zone_output = !p_format->zone_output;
return 0;
case FORMAT_MODIFIER_EPOCH:
p_format->epoch_output = true;
return 0;
case FORMAT_MODIFIER_MONOTONIC:
p_format->monotonic_output = true;
return 0;
case FORMAT_MODIFIER_UID:
p_format->uid_output = true;
return 0;
default:
break;
}
p_format->format = format;
return 1;
}
static const char tz[] = "TZ";
static const char utc[] = "UTC";
/**
* Returns FORMAT_OFF on invalid string
*/
LIBLOG_ABI_PUBLIC AndroidLogPrintFormat android_log_formatFromString(
const char * formatString)
{
static AndroidLogPrintFormat format;
if (strcmp(formatString, "brief") == 0) format = FORMAT_BRIEF;
else if (strcmp(formatString, "process") == 0) format = FORMAT_PROCESS;
else if (strcmp(formatString, "tag") == 0) format = FORMAT_TAG;
else if (strcmp(formatString, "thread") == 0) format = FORMAT_THREAD;
else if (strcmp(formatString, "raw") == 0) format = FORMAT_RAW;
else if (strcmp(formatString, "time") == 0) format = FORMAT_TIME;
else if (strcmp(formatString, "threadtime") == 0) format = FORMAT_THREADTIME;
else if (strcmp(formatString, "long") == 0) format = FORMAT_LONG;
else if (strcmp(formatString, "color") == 0) format = FORMAT_MODIFIER_COLOR;
else if (strcmp(formatString, "usec") == 0) format = FORMAT_MODIFIER_TIME_USEC;
else if (strcmp(formatString, "printable") == 0) format = FORMAT_MODIFIER_PRINTABLE;
else if (strcmp(formatString, "year") == 0) format = FORMAT_MODIFIER_YEAR;
else if (strcmp(formatString, "zone") == 0) format = FORMAT_MODIFIER_ZONE;
else if (strcmp(formatString, "epoch") == 0) format = FORMAT_MODIFIER_EPOCH;
else if (strcmp(formatString, "monotonic") == 0) format = FORMAT_MODIFIER_MONOTONIC;
else if (strcmp(formatString, "uid") == 0) format = FORMAT_MODIFIER_UID;
else {
extern char *tzname[2];
static const char gmt[] = "GMT";
char *cp = getenv(tz);
if (cp) {
cp = strdup(cp);
}
setenv(tz, formatString, 1);
/*
* Run tzset here to determine if the timezone is legitimate. If the
* zone is GMT, check if that is what was asked for, if not then
* did not match any on the system; report an error to caller.
*/
tzset();
if (!tzname[0]
|| ((!strcmp(tzname[0], utc)
|| !strcmp(tzname[0], gmt)) /* error? */
&& strcasecmp(formatString, utc)
&& strcasecmp(formatString, gmt))) { /* ok */
if (cp) {
setenv(tz, cp, 1);
} else {
unsetenv(tz);
}
tzset();
format = FORMAT_OFF;
} else {
format = FORMAT_MODIFIER_ZONE;
}
free(cp);
}
return format;
}
/**
* filterExpression: a single filter expression
* eg "AT:d"
*
* returns 0 on success and -1 on invalid expression
*
* Assumes single threaded execution
*/
LIBLOG_ABI_PUBLIC int android_log_addFilterRule(
AndroidLogFormat *p_format,
const char *filterExpression)
{
size_t tagNameLength;
android_LogPriority pri = ANDROID_LOG_DEFAULT;
tagNameLength = strcspn(filterExpression, ":");
if (tagNameLength == 0) {
goto error;
}
if(filterExpression[tagNameLength] == ':') {
pri = filterCharToPri(filterExpression[tagNameLength+1]);
if (pri == ANDROID_LOG_UNKNOWN) {
goto error;
}
}
if(0 == strncmp("*", filterExpression, tagNameLength)) {
/*
* This filter expression refers to the global filter
* The default level for this is DEBUG if the priority
* is unspecified
*/
if (pri == ANDROID_LOG_DEFAULT) {
pri = ANDROID_LOG_DEBUG;
}
p_format->global_pri = pri;
} else {
/*
* for filter expressions that don't refer to the global
* filter, the default is verbose if the priority is unspecified
*/
if (pri == ANDROID_LOG_DEFAULT) {
pri = ANDROID_LOG_VERBOSE;
}
char *tagName;
/*
* Presently HAVE_STRNDUP is never defined, so the second case is always taken
* Darwin doesn't have strnup, everything else does
*/
#ifdef HAVE_STRNDUP
tagName = strndup(filterExpression, tagNameLength);
#else
/* a few extra bytes copied... */
tagName = strdup(filterExpression);
tagName[tagNameLength] = '\0';
#endif /*HAVE_STRNDUP*/
FilterInfo *p_fi = filterinfo_new(tagName, pri);
free(tagName);
p_fi->p_next = p_format->filters;
p_format->filters = p_fi;
}
return 0;
error:
return -1;
}
/**
* filterString: a comma/whitespace-separated set of filter expressions
*
* eg "AT:d *:i"
*
* returns 0 on success and -1 on invalid expression
*
* Assumes single threaded execution
*
*/
LIBLOG_ABI_PUBLIC int android_log_addFilterString(
AndroidLogFormat *p_format,
const char *filterString)
{
char *filterStringCopy = strdup (filterString);
char *p_cur = filterStringCopy;
char *p_ret;
int err;
/* Yes, I'm using strsep */
while (NULL != (p_ret = strsep(&p_cur, " \t,"))) {
/* ignore whitespace-only entries */
if(p_ret[0] != '\0') {
err = android_log_addFilterRule(p_format, p_ret);
if (err < 0) {
goto error;
}
}
}
free (filterStringCopy);
return 0;
error:
free (filterStringCopy);
return -1;
}
/**
* Splits a wire-format buffer into an AndroidLogEntry
* entry allocated by caller. Pointers will point directly into buf
*
* Returns 0 on success and -1 on invalid wire format (entry will be
* in unspecified state)
*/
LIBLOG_ABI_PUBLIC int android_log_processLogBuffer(
struct logger_entry *buf,
AndroidLogEntry *entry)
{
entry->tv_sec = buf->sec;
entry->tv_nsec = buf->nsec;
entry->uid = -1;
entry->pid = buf->pid;
entry->tid = buf->tid;
/*
* format: <priority:1><tag:N>\0<message:N>\0
*
* tag str
* starts at buf->msg+1
* msg
* starts at buf->msg+1+len(tag)+1
*
* The message may have been truncated by the kernel log driver.
* When that happens, we must null-terminate the message ourselves.
*/
if (buf->len < 3) {
/*
* An well-formed entry must consist of at least a priority
* and two null characters
*/
fprintf(stderr, "+++ LOG: entry too small\n");
return -1;
}
int msgStart = -1;
int msgEnd = -1;
int i;
char *msg = buf->msg;
struct logger_entry_v2 *buf2 = (struct logger_entry_v2 *)buf;
if (buf2->hdr_size) {
msg = ((char *)buf2) + buf2->hdr_size;
if (buf2->hdr_size >= sizeof(struct logger_entry_v4)) {
entry->uid = ((struct logger_entry_v4 *)buf)->uid;
}
}
for (i = 1; i < buf->len; i++) {
if (msg[i] == '\0') {
if (msgStart == -1) {
msgStart = i + 1;
} else {
msgEnd = i;
break;
}
}
}
if (msgStart == -1) {
/* +++ LOG: malformed log message, DYB */
for (i = 1; i < buf->len; i++) {
/* odd characters in tag? */
if ((msg[i] <= ' ') || (msg[i] == ':') || (msg[i] >= 0x7f)) {
msg[i] = '\0';
msgStart = i + 1;
break;
}
}
if (msgStart == -1) {
msgStart = buf->len - 1; /* All tag, no message, print truncates */
}
}
if (msgEnd == -1) {
/* incoming message not null-terminated; force it */
msgEnd = buf->len - 1; /* may result in msgEnd < msgStart */
msg[msgEnd] = '\0';
}
entry->priority = msg[0];
entry->tag = msg + 1;
entry->message = msg + msgStart;
entry->messageLen = (msgEnd < msgStart) ? 0 : (msgEnd - msgStart);
return 0;
}
/*
* Extract a 4-byte value from a byte stream.
*/
static inline uint32_t get4LE(const uint8_t* src)
{
return src[0] | (src[1] << 8) | (src[2] << 16) | (src[3] << 24);
}
/*
* Extract an 8-byte value from a byte stream.
*/
static inline uint64_t get8LE(const uint8_t* src)
{
uint32_t low, high;
low = src[0] | (src[1] << 8) | (src[2] << 16) | (src[3] << 24);
high = src[4] | (src[5] << 8) | (src[6] << 16) | (src[7] << 24);
return ((uint64_t) high << 32) | (uint64_t) low;
}
/*
* 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--;
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 */
{
uint64_t lval;
if (eventDataLen < 8)
return -1;
lval = get8LE(eventData);
eventData += 8;
eventDataLen -= 8;
outCount = snprintf(outBuf, outBufLen, "%" PRId64, lval);
if (outCount < outBufLen) {
outBuf += outCount;
outBufLen -= outCount;
} else {
/* halt output */
goto no_room;
}
}
break;
case EVENT_TYPE_FLOAT:
/* float */
{
uint32_t ival;
float fval;
if (eventDataLen < 4)
return -1;
ival = get4LE(eventData);
fval = *(float*)&ival;
eventData += 4;
eventDataLen -= 4;
outCount = snprintf(outBuf, outBufLen, "%f", fval);
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.
*/
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) {
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;
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;
}
/*
* One utf8 character at a time
*
* Returns the length of the utf8 character in the buffer,
* or -1 if illegal or truncated
*
* Open coded from libutils/Unicode.cpp, borrowed from utf8_length(),
* can not remove from here because of library circular dependencies.
* Expect one-day utf8_character_length with the same signature could
* _also_ be part of libutils/Unicode.cpp if its usefullness needs to
* propagate globally.
*/
LIBLOG_WEAK ssize_t utf8_character_length(const char *src, size_t len)
{
const char *cur = src;
const char first_char = *cur++;
static const uint32_t kUnicodeMaxCodepoint = 0x0010FFFF;
int32_t mask, to_ignore_mask;
size_t num_to_read;
uint32_t utf32;
if ((first_char & 0x80) == 0) { /* ASCII */
return first_char ? 1 : -1;
}
/*
* (UTF-8's character must not be like 10xxxxxx,
* but 110xxxxx, 1110xxxx, ... or 1111110x)
*/
if ((first_char & 0x40) == 0) {
return -1;
}
for (utf32 = 1, num_to_read = 1, mask = 0x40, to_ignore_mask = 0x80;
num_to_read < 5 && (first_char & mask);
num_to_read++, to_ignore_mask |= mask, mask >>= 1) {
if (num_to_read > len) {
return -1;
}
if ((*cur & 0xC0) != 0x80) { /* can not be 10xxxxxx? */
return -1;
}
utf32 = (utf32 << 6) + (*cur++ & 0b00111111);
}
/* "first_char" must be (110xxxxx - 11110xxx) */
if (num_to_read >= 5) {
return -1;
}
to_ignore_mask |= mask;
utf32 |= ((~to_ignore_mask) & first_char) << (6 * (num_to_read - 1));
if (utf32 > kUnicodeMaxCodepoint) {
return -1;
}
return num_to_read;
}
/*
* Convert to printable from message to p buffer, return string length. If p is
* NULL, do not copy, but still return the expected string length.
*/
static size_t convertPrintable(char *p, const char *message, size_t messageLen)
{
char *begin = p;
bool print = p != NULL;
while (messageLen) {
char buf[6];
ssize_t len = sizeof(buf) - 1;
if ((size_t)len > messageLen) {
len = messageLen;
}
len = utf8_character_length(message, len);
if (len < 0) {
snprintf(buf, sizeof(buf),
((messageLen > 1) && isdigit(message[1]))
? "\\%03o"
: "\\%o",
*message & 0377);
len = 1;
} else {
buf[0] = '\0';
if (len == 1) {
if (*message == '\a') {
strcpy(buf, "\\a");
} else if (*message == '\b') {
strcpy(buf, "\\b");
} else if (*message == '\t') {
strcpy(buf, "\t"); // Do not escape tabs
} else if (*message == '\v') {
strcpy(buf, "\\v");
} else if (*message == '\f') {
strcpy(buf, "\\f");
} else if (*message == '\r') {
strcpy(buf, "\\r");
} else if (*message == '\\') {
strcpy(buf, "\\\\");
} else if ((*message < ' ') || (*message & 0x80)) {
snprintf(buf, sizeof(buf), "\\%o", *message & 0377);
}
}
if (!buf[0]) {
strncpy(buf, message, len);
buf[len] = '\0';
}
}
if (print) {
strcpy(p, buf);
}
p += strlen(buf);
message += len;
messageLen -= len;
}
return p - begin;
}
static char *readSeconds(char *e, struct timespec *t)
{
unsigned long multiplier;
char *p;
t->tv_sec = strtoul(e, &p, 10);
if (*p != '.') {
return NULL;
}
t->tv_nsec = 0;
multiplier = NS_PER_SEC;
while (isdigit(*++p) && (multiplier /= 10)) {
t->tv_nsec += (*p - '0') * multiplier;
}
return p;
}
static struct timespec *sumTimespec(struct timespec *left,
struct timespec *right)
{
left->tv_nsec += right->tv_nsec;
left->tv_sec += right->tv_sec;
if (left->tv_nsec >= (long)NS_PER_SEC) {
left->tv_nsec -= NS_PER_SEC;
left->tv_sec += 1;
}
return left;
}
static struct timespec *subTimespec(struct timespec *result,
struct timespec *left,
struct timespec *right)
{
result->tv_nsec = left->tv_nsec - right->tv_nsec;
result->tv_sec = left->tv_sec - right->tv_sec;
if (result->tv_nsec < 0) {
result->tv_nsec += NS_PER_SEC;
result->tv_sec -= 1;
}
return result;
}
static long long nsecTimespec(struct timespec *now)
{
return (long long)now->tv_sec * NS_PER_SEC + now->tv_nsec;
}
static void convertMonotonic(struct timespec *result,
const AndroidLogEntry *entry)
{
struct listnode *node;
struct conversionList {
struct listnode node; /* first */
struct timespec time;
struct timespec convert;
} *list, *next;
struct timespec time, convert;
/* If we do not have a conversion list, build one up */
if (list_empty(&convertHead)) {
bool suspended_pending = false;
struct timespec suspended_monotonic = { 0, 0 };
struct timespec suspended_diff = { 0, 0 };
/*
* Read dmesg for _some_ synchronization markers and insert
* Anything in the Android Logger before the dmesg logging span will
* be highly suspect regarding the monotonic time calculations.
*/
FILE *p = popen("/system/bin/dmesg", "r");
if (p) {
char *line = NULL;
size_t len = 0;
while (getline(&line, &len, p) > 0) {
static const char suspend[] = "PM: suspend entry ";
static const char resume[] = "PM: suspend exit ";
static const char healthd[] = "healthd";
static const char battery[] = ": battery ";
static const char suspended[] = "Suspended for ";
struct timespec monotonic;
struct tm tm;
char *cp, *e = line;
bool add_entry = true;
if (*e == '<') {
while (*e && (*e != '>')) {
++e;
}
if (*e != '>') {
continue;
}
}
if (*e != '[') {
continue;
}
while (*++e == ' ') {
;
}
e = readSeconds(e, &monotonic);
if (!e || (*e != ']')) {
continue;
}
if ((e = strstr(e, suspend))) {
e += sizeof(suspend) - 1;
} else if ((e = strstr(line, resume))) {
e += sizeof(resume) - 1;
} else if (((e = strstr(line, healthd)))
&& ((e = strstr(e + sizeof(healthd) - 1, battery)))) {
/* NB: healthd is roughly 150us late, worth the price to
* deal with ntp-induced or hardware clock drift. */
e += sizeof(battery) - 1;
} else if ((e = strstr(line, suspended))) {
e += sizeof(suspended) - 1;
e = readSeconds(e, &time);
if (!e) {
continue;
}
add_entry = false;
suspended_pending = true;
suspended_monotonic = monotonic;
suspended_diff = time;
} else {
continue;
}
if (add_entry) {
/* look for "????-??-?? ??:??:??.????????? UTC" */
cp = strstr(e, " UTC");
if (!cp || ((cp - e) < 29) || (cp[-10] != '.')) {
continue;
}
e = cp - 29;
cp = readSeconds(cp - 10, &time);
if (!cp) {
continue;
}
cp = strptime(e, "%Y-%m-%d %H:%M:%S.", &tm);
if (!cp) {
continue;
}
cp = getenv(tz);
if (cp) {
cp = strdup(cp);
}
setenv(tz, utc, 1);
time.tv_sec = mktime(&tm);
if (cp) {
setenv(tz, cp, 1);
free(cp);
} else {
unsetenv(tz);
}
list = calloc(1, sizeof(struct conversionList));
list_init(&list->node);
list->time = time;
subTimespec(&list->convert, &time, &monotonic);
list_add_tail(&convertHead, &list->node);
}
if (suspended_pending && !list_empty(&convertHead)) {
list = node_to_item(list_tail(&convertHead),
struct conversionList, node);
if (subTimespec(&time,
subTimespec(&time,
&list->time,
&list->convert),
&suspended_monotonic)->tv_sec > 0) {
/* resume, what is convert factor before? */
subTimespec(&convert, &list->convert, &suspended_diff);
} else {
/* suspend */
convert = list->convert;
}
time = suspended_monotonic;
sumTimespec(&time, &convert);
/* breakpoint just before sleep */
list = calloc(1, sizeof(struct conversionList));
list_init(&list->node);
list->time = time;
list->convert = convert;
list_add_tail(&convertHead, &list->node);
/* breakpoint just after sleep */
list = calloc(1, sizeof(struct conversionList));
list_init(&list->node);
list->time = time;
sumTimespec(&list->time, &suspended_diff);
list->convert = convert;
sumTimespec(&list->convert, &suspended_diff);
list_add_tail(&convertHead, &list->node);
suspended_pending = false;
}
}
pclose(p);
}
/* last entry is our current time conversion */
list = calloc(1, sizeof(struct conversionList));
list_init(&list->node);
clock_gettime(CLOCK_REALTIME, &list->time);
clock_gettime(CLOCK_MONOTONIC, &convert);
clock_gettime(CLOCK_MONOTONIC, &time);
/* Correct for instant clock_gettime latency (syscall or ~30ns) */
subTimespec(&time, &convert, subTimespec(&time, &time, &convert));
/* Calculate conversion factor */
subTimespec(&list->convert, &list->time, &time);
list_add_tail(&convertHead, &list->node);
if (suspended_pending) {
/* manufacture a suspend @ point before */
subTimespec(&convert, &list->convert, &suspended_diff);
time = suspended_monotonic;
sumTimespec(&time, &convert);
/* breakpoint just after sleep */
list = calloc(1, sizeof(struct conversionList));
list_init(&list->node);
list->time = time;
sumTimespec(&list->time, &suspended_diff);
list->convert = convert;
sumTimespec(&list->convert, &suspended_diff);
list_add_head(&convertHead, &list->node);
/* breakpoint just before sleep */
list = calloc(1, sizeof(struct conversionList));
list_init(&list->node);
list->time = time;
list->convert = convert;
list_add_head(&convertHead, &list->node);
}
}
/* Find the breakpoint in the conversion list */
list = node_to_item(list_head(&convertHead), struct conversionList, node);
next = NULL;
list_for_each(node, &convertHead) {
next = node_to_item(node, struct conversionList, node);
if (entry->tv_sec < next->time.tv_sec) {
break;
} else if (entry->tv_sec == next->time.tv_sec) {
if (entry->tv_nsec < next->time.tv_nsec) {
break;
}
}
list = next;
}
/* blend time from one breakpoint to the next */
convert = list->convert;
if (next) {
unsigned long long total, run;
total = nsecTimespec(subTimespec(&time, &next->time, &list->time));
time.tv_sec = entry->tv_sec;
time.tv_nsec = entry->tv_nsec;
run = nsecTimespec(subTimespec(&time, &time, &list->time));
if (run < total) {
long long crun;
float f = nsecTimespec(subTimespec(&time, &next->convert, &convert));
f *= run;
f /= total;
crun = f;
convert.tv_sec += crun / (long long)NS_PER_SEC;
if (crun < 0) {
convert.tv_nsec -= (-crun) % NS_PER_SEC;
if (convert.tv_nsec < 0) {
convert.tv_nsec += NS_PER_SEC;
convert.tv_sec -= 1;
}
} else {
convert.tv_nsec += crun % NS_PER_SEC;
if (convert.tv_nsec >= (long)NS_PER_SEC) {
convert.tv_nsec -= NS_PER_SEC;
convert.tv_sec += 1;
}
}
}
}
/* Apply the correction factor */
result->tv_sec = entry->tv_sec;
result->tv_nsec = entry->tv_nsec;
subTimespec(result, result, &convert);
}
/**
* Formats a log message into a buffer
*
* Uses defaultBuffer if it can, otherwise malloc()'s a new buffer
* If return value != defaultBuffer, caller must call free()
* Returns NULL on malloc error
*/
LIBLOG_ABI_PUBLIC char *android_log_formatLogLine (
AndroidLogFormat *p_format,
char *defaultBuffer,
size_t defaultBufferSize,
const AndroidLogEntry *entry,
size_t *p_outLength)
{
#if !defined(_WIN32)
struct tm tmBuf;
#endif
struct tm* ptm;
char timeBuf[64]; /* good margin, 23+nul for msec, 26+nul for usec */
char prefixBuf[128], suffixBuf[128];
char priChar;
int prefixSuffixIsHeaderFooter = 0;
char *ret;
time_t now;
unsigned long nsec;
priChar = filterPriToChar(entry->priority);
size_t prefixLen = 0, suffixLen = 0;
size_t len;
/*
* Get the current date/time in pretty form
*
* It's often useful when examining a log with "less" to jump to
* a specific point in the file by searching for the date/time stamp.
* For this reason it's very annoying to have regexp meta characters
* in the time stamp. Don't use forward slashes, parenthesis,
* brackets, asterisks, or other special chars here.
*
* The caller may have affected the timezone environment, this is
* expected to be sensitive to that.
*/
now = entry->tv_sec;
nsec = entry->tv_nsec;
if (p_format->monotonic_output) {
// prevent convertMonotonic from being called if logd is monotonic
if (android_log_clockid() != CLOCK_MONOTONIC) {
struct timespec time;
convertMonotonic(&time, entry);
now = time.tv_sec;
nsec = time.tv_nsec;
}
}
if (now < 0) {
nsec = NS_PER_SEC - nsec;
}
if (p_format->epoch_output || p_format->monotonic_output) {
ptm = NULL;
snprintf(timeBuf, sizeof(timeBuf),
p_format->monotonic_output ? "%6lld" : "%19lld",
(long long)now);
} else {
#if !defined(_WIN32)
ptm = localtime_r(&now, &tmBuf);
#else
ptm = localtime(&now);
#endif
strftime(timeBuf, sizeof(timeBuf),
&"%Y-%m-%d %H:%M:%S"[p_format->year_output ? 0 : 3],
ptm);
}
len = strlen(timeBuf);
if (p_format->usec_time_output) {
len += snprintf(timeBuf + len, sizeof(timeBuf) - len,
".%06ld", nsec / US_PER_NSEC);
} else {
len += snprintf(timeBuf + len, sizeof(timeBuf) - len,
".%03ld", nsec / MS_PER_NSEC);
}
if (p_format->zone_output && ptm) {
strftime(timeBuf + len, sizeof(timeBuf) - len, " %z", ptm);
}
/*
* Construct a buffer containing the log header and log message.
*/
if (p_format->colored_output) {
prefixLen = snprintf(prefixBuf, sizeof(prefixBuf), "\x1B[38;5;%dm",
colorFromPri(entry->priority));
prefixLen = MIN(prefixLen, sizeof(prefixBuf));
suffixLen = snprintf(suffixBuf, sizeof(suffixBuf), "\x1B[0m");
suffixLen = MIN(suffixLen, sizeof(suffixBuf));
}
char uid[16];
uid[0] = '\0';
if (p_format->uid_output) {
if (entry->uid >= 0) {
const struct android_id_info *info = android_ids;
size_t i;
for (i = 0; i < android_id_count; ++i) {
if (info->aid == (unsigned int)entry->uid) {
break;
}
++info;
}
if ((i < android_id_count) && (strlen(info->name) <= 5)) {
snprintf(uid, sizeof(uid), "%5s:", info->name);
} else {
// Not worth parsing package list, names all longer than 5
snprintf(uid, sizeof(uid), "%5d:", entry->uid);
}
} else {
snprintf(uid, sizeof(uid), " ");
}
}
switch (p_format->format) {
case FORMAT_TAG:
len = snprintf(prefixBuf + prefixLen, sizeof(prefixBuf) - prefixLen,
"%c/%-8s: ", priChar, entry->tag);
strcpy(suffixBuf + suffixLen, "\n");
++suffixLen;
break;
case FORMAT_PROCESS:
len = snprintf(suffixBuf + suffixLen, sizeof(suffixBuf) - suffixLen,
" (%s)\n", entry->tag);
suffixLen += MIN(len, sizeof(suffixBuf) - suffixLen);
len = snprintf(prefixBuf + prefixLen, sizeof(prefixBuf) - prefixLen,
"%c(%s%5d) ", priChar, uid, entry->pid);
break;
case FORMAT_THREAD:
len = snprintf(prefixBuf + prefixLen, sizeof(prefixBuf) - prefixLen,
"%c(%s%5d:%5d) ", priChar, uid, entry->pid, entry->tid);
strcpy(suffixBuf + suffixLen, "\n");
++suffixLen;
break;
case FORMAT_RAW:
prefixBuf[prefixLen] = 0;
len = 0;
strcpy(suffixBuf + suffixLen, "\n");
++suffixLen;
break;
case FORMAT_TIME:
len = snprintf(prefixBuf + prefixLen, sizeof(prefixBuf) - prefixLen,
"%s %c/%-8s(%s%5d): ", timeBuf, priChar, entry->tag,
uid, entry->pid);
strcpy(suffixBuf + suffixLen, "\n");
++suffixLen;
break;
case FORMAT_THREADTIME:
ret = strchr(uid, ':');
if (ret) {
*ret = ' ';
}
len = snprintf(prefixBuf + prefixLen, sizeof(prefixBuf) - prefixLen,
"%s %s%5d %5d %c %-8s: ", timeBuf,
uid, entry->pid, entry->tid, priChar, entry->tag);
strcpy(suffixBuf + suffixLen, "\n");
++suffixLen;
break;
case FORMAT_LONG:
len = snprintf(prefixBuf + prefixLen, sizeof(prefixBuf) - prefixLen,
"[ %s %s%5d:%5d %c/%-8s ]\n",
timeBuf, uid, entry->pid, entry->tid, priChar, entry->tag);
strcpy(suffixBuf + suffixLen, "\n\n");
suffixLen += 2;
prefixSuffixIsHeaderFooter = 1;
break;
case FORMAT_BRIEF:
default:
len = snprintf(prefixBuf + prefixLen, sizeof(prefixBuf) - prefixLen,
"%c/%-8s(%s%5d): ", priChar, entry->tag, uid, entry->pid);
strcpy(suffixBuf + suffixLen, "\n");
++suffixLen;
break;
}
/* snprintf has a weird return value. It returns what would have been
* written given a large enough buffer. In the case that the prefix is
* longer then our buffer(128), it messes up the calculations below
* possibly causing heap corruption. To avoid this we double check and
* set the length at the maximum (size minus null byte)
*/
prefixLen += len;
if (prefixLen >= sizeof(prefixBuf)) {
prefixLen = sizeof(prefixBuf) - 1;
prefixBuf[sizeof(prefixBuf) - 1] = '\0';
}
if (suffixLen >= sizeof(suffixBuf)) {
suffixLen = sizeof(suffixBuf) - 1;
suffixBuf[sizeof(suffixBuf) - 2] = '\n';
suffixBuf[sizeof(suffixBuf) - 1] = '\0';
}
/* the following code is tragically unreadable */
size_t numLines;
char *p;
size_t bufferSize;
const char *pm;
if (prefixSuffixIsHeaderFooter) {
/* we're just wrapping message with a header/footer */
numLines = 1;
} else {
pm = entry->message;
numLines = 0;
/*
* The line-end finding here must match the line-end finding
* in for ( ... numLines...) loop below
*/
while (pm < (entry->message + entry->messageLen)) {
if (*pm++ == '\n') numLines++;
}
/* plus one line for anything not newline-terminated at the end */
if (pm > entry->message && *(pm-1) != '\n') numLines++;
}
/*
* this is an upper bound--newlines in message may be counted
* extraneously
*/
bufferSize = (numLines * (prefixLen + suffixLen)) + 1;
if (p_format->printable_output) {
/* Calculate extra length to convert non-printable to printable */
bufferSize += convertPrintable(NULL, entry->message, entry->messageLen);
} else {
bufferSize += entry->messageLen;
}
if (defaultBufferSize >= bufferSize) {
ret = defaultBuffer;
} else {
ret = (char *)malloc(bufferSize);
if (ret == NULL) {
return ret;
}
}
ret[0] = '\0'; /* to start strcat off */
p = ret;
pm = entry->message;
if (prefixSuffixIsHeaderFooter) {
strcat(p, prefixBuf);
p += prefixLen;
if (p_format->printable_output) {
p += convertPrintable(p, entry->message, entry->messageLen);
} else {
strncat(p, entry->message, entry->messageLen);
p += entry->messageLen;
}
strcat(p, suffixBuf);
p += suffixLen;
} else {
do {
const char *lineStart;
size_t lineLen;
lineStart = pm;
/* Find the next end-of-line in message */
while (pm < (entry->message + entry->messageLen)
&& *pm != '\n') pm++;
lineLen = pm - lineStart;
strcat(p, prefixBuf);
p += prefixLen;
if (p_format->printable_output) {
p += convertPrintable(p, lineStart, lineLen);
} else {
strncat(p, lineStart, lineLen);
p += lineLen;
}
strcat(p, suffixBuf);
p += suffixLen;
if (*pm == '\n') pm++;
} while (pm < (entry->message + entry->messageLen));
}
if (p_outLength != NULL) {
*p_outLength = p - ret;
}
return ret;
}
/**
* Either print or do not print log line, based on filter
*
* Returns count bytes written
*/
LIBLOG_ABI_PUBLIC int android_log_printLogLine(
AndroidLogFormat *p_format,
int fd,
const AndroidLogEntry *entry)
{
int ret;
char defaultBuffer[512];
char *outBuffer = NULL;
size_t totalLen;
outBuffer = android_log_formatLogLine(p_format, defaultBuffer,
sizeof(defaultBuffer), entry, &totalLen);
if (!outBuffer)
return -1;
do {
ret = write(fd, outBuffer, totalLen);
} while (ret < 0 && errno == EINTR);
if (ret < 0) {
fprintf(stderr, "+++ LOG: write failed (errno=%d)\n", errno);
ret = 0;
goto done;
}
if (((size_t)ret) < totalLen) {
fprintf(stderr, "+++ LOG: write partial (%d of %d)\n", ret,
(int)totalLen);
goto done;
}
done:
if (outBuffer != defaultBuffer) {
free(outBuffer);
}
return ret;
}
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