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|
// SPDX-License-Identifier: GPL-3.0-or-later
#include "windows-events.h"
static void wevt_event_done(WEVT_LOG *log);
static uint64_t wevt_log_file_size(const wchar_t *channel);
// --------------------------------------------------------------------------------------------------------------------
static const char *EvtGetExtendedStatus_utf8(void) {
static __thread wchar_t wbuf[4096];
static __thread char buf[4096];
DWORD wbuf_used = 0;
if(EvtGetExtendedStatus(sizeof(wbuf) / sizeof(wchar_t), wbuf, &wbuf_used) == ERROR_SUCCESS) {
wbuf[sizeof(wbuf) / sizeof(wchar_t) - 1] = 0;
unicode2utf8(buf, sizeof(buf), wbuf);
}
else
buf[0] = '\0';
// the EvtGetExtendedStatus() may be successful with an empty message
if(!buf[0])
strncpyz(buf, "no additional information", sizeof(buf) - 1);
return buf;
}
// --------------------------------------------------------------------------------------------------------------------
bool EvtFormatMessage_utf16(
TXT_UTF16 *dst, EVT_HANDLE hMetadata, EVT_HANDLE hEvent, DWORD dwMessageId, EVT_FORMAT_MESSAGE_FLAGS flags) {
dst->used = 0;
DWORD size = 0;
if(!dst->data) {
EvtFormatMessage(hMetadata, hEvent, dwMessageId, 0, NULL, flags, 0, NULL, &size);
if(!size) {
// nd_log(NDLS_COLLECTORS, NDLP_ERR, "EvtFormatMessage() to get message size failed.");
goto cleanup;
}
txt_utf16_resize(dst, size, false);
}
// First, try to get the message using the existing buffer
if (!EvtFormatMessage(hMetadata, hEvent, dwMessageId, 0, NULL, flags, dst->size, dst->data, &size) || !dst->data) {
if (dst->data && GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
// nd_log(NDLS_COLLECTORS, NDLP_ERR, "EvtFormatMessage() failed.");
goto cleanup;
}
// Try again with the resized buffer
txt_utf16_resize(dst, size, false);
if (!EvtFormatMessage(hMetadata, hEvent, dwMessageId, 0, NULL, flags, dst->size, dst->data, &size)) {
// nd_log(NDLS_COLLECTORS, NDLP_ERR, "EvtFormatMessage() failed after resizing buffer.");
goto cleanup;
}
}
// make sure it is null terminated
if(size <= dst->size)
dst->data[size - 1] = 0;
else
dst->data[dst->size - 1] = 0;
// unfortunately we have to calculate the length every time
// the size returned may not be the length of the dst string
dst->used = wcslen(dst->data) + 1;
return true;
cleanup:
dst->used = 0;
return false;
}
static bool EvtFormatMessage_utf8(
TXT_UTF16 *tmp, PROVIDER_META_HANDLE *p, EVT_HANDLE hEvent,
TXT_UTF8 *dst, EVT_FORMAT_MESSAGE_FLAGS flags) {
dst->src = TXT_SOURCE_EVENT_LOG;
if(EvtFormatMessage_utf16(tmp, provider_handle(p), hEvent, 0, flags))
return txt_utf16_to_utf8(dst, tmp);
txt_utf8_empty(dst);
return false;
}
bool EvtFormatMessage_Event_utf8(TXT_UTF16 *tmp, PROVIDER_META_HANDLE *p, EVT_HANDLE hEvent, TXT_UTF8 *dst) {
return EvtFormatMessage_utf8(tmp, p, hEvent, dst, EvtFormatMessageEvent);
}
bool EvtFormatMessage_Xml_utf8(TXT_UTF16 *tmp, PROVIDER_META_HANDLE *p, EVT_HANDLE hEvent, TXT_UTF8 *dst) {
return EvtFormatMessage_utf8(tmp, p, hEvent, dst, EvtFormatMessageXml);
}
// --------------------------------------------------------------------------------------------------------------------
static void wevt_get_field_from_cache(
WEVT_LOG *log, uint64_t value, PROVIDER_META_HANDLE *h,
TXT_UTF8 *dst, const ND_UUID *provider,
WEVT_FIELD_TYPE cache_type, EVT_FORMAT_MESSAGE_FLAGS flags) {
if (field_cache_get(cache_type, provider, value, dst))
return;
EvtFormatMessage_utf8(&log->ops.unicode, h, log->hEvent, dst, flags);
field_cache_set(cache_type, provider, value, dst);
}
// --------------------------------------------------------------------------------------------------------------------
// Level
#define SET_LEN_AND_RETURN(constant) *len = sizeof(constant) - 1; return constant
static inline const char *wevt_level_hardcoded(uint64_t level, size_t *len) {
switch(level) {
case WEVT_LEVEL_NONE: SET_LEN_AND_RETURN(WEVT_LEVEL_NAME_NONE);
case WEVT_LEVEL_CRITICAL: SET_LEN_AND_RETURN(WEVT_LEVEL_NAME_CRITICAL);
case WEVT_LEVEL_ERROR: SET_LEN_AND_RETURN(WEVT_LEVEL_NAME_ERROR);
case WEVT_LEVEL_WARNING: SET_LEN_AND_RETURN(WEVT_LEVEL_NAME_WARNING);
case WEVT_LEVEL_INFORMATION: SET_LEN_AND_RETURN(WEVT_LEVEL_NAME_INFORMATION);
case WEVT_LEVEL_VERBOSE: SET_LEN_AND_RETURN(WEVT_LEVEL_NAME_VERBOSE);
default: *len = 0; return NULL;
}
}
static void wevt_get_level(WEVT_LOG *log, WEVT_EVENT *ev, PROVIDER_META_HANDLE *h) {
TXT_UTF8 *dst = &log->ops.level;
uint64_t value = ev->level;
txt_utf8_empty(dst);
EVT_FORMAT_MESSAGE_FLAGS flags = EvtFormatMessageLevel;
WEVT_FIELD_TYPE cache_type = WEVT_FIELD_TYPE_LEVEL;
bool is_provider = is_valid_provider_level(value, true);
if(!is_provider) {
size_t len;
const char *hardcoded = wevt_level_hardcoded(value, &len);
if(hardcoded) {
txt_utf8_set(dst, hardcoded, len);
dst->src = TXT_SOURCE_HARDCODED;
}
else {
// since this is not a provider value
// we expect to get the system description of it
wevt_get_field_from_cache(log, value, h, dst, &ev->provider, cache_type, flags);
}
}
else if (!provider_get_level(dst, h, value)) {
// not found in the manifest, get it from the cache
wevt_get_field_from_cache(log, value, h, dst, &ev->provider, cache_type, flags);
}
txt_utf8_set_numeric_if_empty(
dst, WEVT_PREFIX_LEVEL, sizeof(WEVT_PREFIX_LEVEL) - 1, ev->level);
}
// --------------------------------------------------------------------------------------------------------------------
// Opcode
static inline const char *wevt_opcode_hardcoded(uint64_t opcode, size_t *len) {
switch(opcode) {
case WEVT_OPCODE_INFO: SET_LEN_AND_RETURN(WEVT_OPCODE_NAME_INFO);
case WEVT_OPCODE_START: SET_LEN_AND_RETURN(WEVT_OPCODE_NAME_START);
case WEVT_OPCODE_STOP: SET_LEN_AND_RETURN(WEVT_OPCODE_NAME_STOP);
case WEVT_OPCODE_DC_START: SET_LEN_AND_RETURN(WEVT_OPCODE_NAME_DC_START);
case WEVT_OPCODE_DC_STOP: SET_LEN_AND_RETURN(WEVT_OPCODE_NAME_DC_STOP);
case WEVT_OPCODE_EXTENSION: SET_LEN_AND_RETURN(WEVT_OPCODE_NAME_EXTENSION);
case WEVT_OPCODE_REPLY: SET_LEN_AND_RETURN(WEVT_OPCODE_NAME_REPLY);
case WEVT_OPCODE_RESUME: SET_LEN_AND_RETURN(WEVT_OPCODE_NAME_RESUME);
case WEVT_OPCODE_SUSPEND: SET_LEN_AND_RETURN(WEVT_OPCODE_NAME_SUSPEND);
case WEVT_OPCODE_SEND: SET_LEN_AND_RETURN(WEVT_OPCODE_NAME_SEND);
case WEVT_OPCODE_RECEIVE: SET_LEN_AND_RETURN(WEVT_OPCODE_NAME_RECEIVE);
default: *len = 0; return NULL;
}
}
static void wevt_get_opcode(WEVT_LOG *log, WEVT_EVENT *ev, PROVIDER_META_HANDLE *h) {
TXT_UTF8 *dst = &log->ops.opcode;
uint64_t value = ev->opcode;
txt_utf8_empty(dst);
EVT_FORMAT_MESSAGE_FLAGS flags = EvtFormatMessageOpcode;
WEVT_FIELD_TYPE cache_type = WEVT_FIELD_TYPE_OPCODE;
bool is_provider = is_valid_provider_opcode(value, true);
if(!is_provider) {
size_t len;
const char *hardcoded = wevt_opcode_hardcoded(value, &len);
if(hardcoded) {
txt_utf8_set(dst, hardcoded, len);
dst->src = TXT_SOURCE_HARDCODED;
}
else {
// since this is not a provider value
// we expect to get the system description of it
wevt_get_field_from_cache(log, value, h, dst, &ev->provider, cache_type, flags);
}
}
else if (!provider_get_opcode(dst, h, value)) {
// not found in the manifest, get it from the cache
wevt_get_field_from_cache(log, value, h, dst, &ev->provider, cache_type, flags);
}
txt_utf8_set_numeric_if_empty(
dst, WEVT_PREFIX_OPCODE, sizeof(WEVT_PREFIX_OPCODE) - 1, ev->opcode);
}
// --------------------------------------------------------------------------------------------------------------------
// Task
static const char *wevt_task_hardcoded(uint64_t task, size_t *len) {
switch(task) {
case WEVT_TASK_NONE: SET_LEN_AND_RETURN(WEVT_TASK_NAME_NONE);
default: *len = 0; return NULL;
}
}
static void wevt_get_task(WEVT_LOG *log, WEVT_EVENT *ev, PROVIDER_META_HANDLE *h) {
TXT_UTF8 *dst = &log->ops.task;
uint64_t value = ev->task;
txt_utf8_empty(dst);
EVT_FORMAT_MESSAGE_FLAGS flags = EvtFormatMessageTask;
WEVT_FIELD_TYPE cache_type = WEVT_FIELD_TYPE_TASK;
bool is_provider = is_valid_provider_task(value, true);
if(!is_provider) {
size_t len;
const char *hardcoded = wevt_task_hardcoded(value, &len);
if(hardcoded) {
txt_utf8_set(dst, hardcoded, len);
dst->src = TXT_SOURCE_HARDCODED;
}
else {
// since this is not a provider value
// we expect to get the system description of it
wevt_get_field_from_cache(log, value, h, dst, &ev->provider, cache_type, flags);
}
}
else if (!provider_get_task(dst, h, value)) {
// not found in the manifest, get it from the cache
wevt_get_field_from_cache(log, value, h, dst, &ev->provider, cache_type, flags);
}
txt_utf8_set_numeric_if_empty(
dst, WEVT_PREFIX_TASK, sizeof(WEVT_PREFIX_TASK) - 1, ev->task);
}
// --------------------------------------------------------------------------------------------------------------------
// Keyword
#define SET_BITS(msk, txt) { .mask = msk, .name = txt, .len = sizeof(txt) - 1, }
static uint64_t wevt_keyword_handle_reserved(uint64_t value, TXT_UTF8 *dst) {
struct {
uint64_t mask;
const char *name;
size_t len;
} bits[] = {
SET_BITS(WEVT_KEYWORD_EVENTLOG_CLASSIC, WEVT_KEYWORD_NAME_EVENTLOG_CLASSIC),
SET_BITS(WEVT_KEYWORD_CORRELATION_HINT, WEVT_KEYWORD_NAME_CORRELATION_HINT),
SET_BITS(WEVT_KEYWORD_AUDIT_SUCCESS, WEVT_KEYWORD_NAME_AUDIT_SUCCESS),
SET_BITS(WEVT_KEYWORD_AUDIT_FAILURE, WEVT_KEYWORD_NAME_AUDIT_FAILURE),
SET_BITS(WEVT_KEYWORD_SQM, WEVT_KEYWORD_NAME_SQM),
SET_BITS(WEVT_KEYWORD_WDI_DIAG, WEVT_KEYWORD_NAME_WDI_DIAG),
SET_BITS(WEVT_KEYWORD_WDI_CONTEXT, WEVT_KEYWORD_NAME_WDI_CONTEXT),
SET_BITS(WEVT_KEYWORD_RESPONSE_TIME, WEVT_KEYWORD_NAME_RESPONSE_TIME),
};
txt_utf8_empty(dst);
for(size_t i = 0; i < sizeof(bits) / sizeof(bits[0]) ;i++) {
if((value & bits[i].mask) == bits[i].mask) {
txt_utf8_add_keywords_separator_if_needed(dst);
txt_utf8_append(dst, bits[i].name, bits[i].len);
value &= ~(bits[i].mask);
dst->src = TXT_SOURCE_HARDCODED;
}
}
// return it without any remaining reserved bits
return value & 0x0000FFFFFFFFFFFF;
}
static void wevt_get_keyword(WEVT_LOG *log, WEVT_EVENT *ev, PROVIDER_META_HANDLE *h) {
TXT_UTF8 *dst = &log->ops.keywords;
if(ev->keywords == WEVT_KEYWORD_NONE) {
txt_utf8_set(dst, WEVT_KEYWORD_NAME_NONE, sizeof(WEVT_KEYWORD_NAME_NONE) - 1);
dst->src = TXT_SOURCE_HARDCODED;
}
uint64_t value = wevt_keyword_handle_reserved(ev->keywords, dst);
EVT_FORMAT_MESSAGE_FLAGS flags = EvtFormatMessageKeyword;
WEVT_FIELD_TYPE cache_type = WEVT_FIELD_TYPE_KEYWORD;
if(!value && dst->used <= 1) {
// no hardcoded info in the buffer, make it None
txt_utf8_set(dst, WEVT_KEYWORD_NAME_NONE, sizeof(WEVT_KEYWORD_NAME_NONE) - 1);
dst->src = TXT_SOURCE_HARDCODED;
}
else if (value && !provider_get_keywords(dst, h, value) && dst->used <= 1) {
// the provider did not provide any info and the description is still empty.
// the system returns 1 keyword, the highest bit, not a list
// so, when we call the system, we pass the original value (ev->keywords)
wevt_get_field_from_cache(log, ev->keywords, h, dst, &ev->provider, cache_type, flags);
}
txt_utf8_set_hex_if_empty(
dst, WEVT_PREFIX_KEYWORDS, sizeof(WEVT_PREFIX_KEYWORDS) - 1, ev->keywords);
}
// --------------------------------------------------------------------------------------------------------------------
// Fetching Events
static inline bool wEvtRender(WEVT_LOG *log, EVT_HANDLE context, WEVT_VARIANT *raw) {
DWORD bytes_used = 0, property_count = 0;
if (!EvtRender(context, log->hEvent, EvtRenderEventValues, raw->size, raw->data, &bytes_used, &property_count)) {
// information exceeds the allocated space
if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
nd_log(NDLS_COLLECTORS, NDLP_ERR,
"EvtRender() failed, hRenderSystemContext: 0x%lx, hEvent: 0x%lx, content: 0x%lx, size: %u, extended info: %s",
(uintptr_t)context, (uintptr_t)log->hEvent, (uintptr_t)raw->data, raw->size,
EvtGetExtendedStatus_utf8());
return false;
}
wevt_variant_resize(raw, bytes_used);
if (!EvtRender(context, log->hEvent, EvtRenderEventValues, raw->size, raw->data, &bytes_used, &property_count)) {
nd_log(NDLS_COLLECTORS, NDLP_ERR,
"EvtRender() failed, after bytes_used increase, extended info: %s",
EvtGetExtendedStatus_utf8());
return false;
}
}
raw->used = bytes_used;
raw->count = property_count;
return true;
}
static bool wevt_get_next_event_one(WEVT_LOG *log, WEVT_EVENT *ev) {
bool ret = false;
if(!wEvtRender(log, log->hRenderSystemContext, &log->ops.raw.system))
goto cleanup;
EVT_VARIANT *content = log->ops.raw.system.data;
ev->id = wevt_field_get_uint64(&content[EvtSystemEventRecordId]);
ev->event_id = wevt_field_get_uint16(&content[EvtSystemEventID]);
ev->level = wevt_field_get_uint8(&content[EvtSystemLevel]);
ev->opcode = wevt_field_get_uint8(&content[EvtSystemOpcode]);
ev->keywords = wevt_field_get_uint64_hex(&content[EvtSystemKeywords]);
ev->version = wevt_field_get_uint8(&content[EvtSystemVersion]);
ev->task = wevt_field_get_uint16(&content[EvtSystemTask]);
ev->qualifiers = wevt_field_get_uint16(&content[EvtSystemQualifiers]);
ev->process_id = wevt_field_get_uint32(&content[EvtSystemProcessID]);
ev->thread_id = wevt_field_get_uint32(&content[EvtSystemThreadID]);
ev->created_ns = wevt_field_get_filetime_to_ns(&content[EvtSystemTimeCreated]);
if(log->type & WEVT_QUERY_EXTENDED) {
wevt_field_get_string_utf8(&content[EvtSystemChannel], &log->ops.channel);
wevt_field_get_string_utf8(&content[EvtSystemComputer], &log->ops.computer);
wevt_field_get_string_utf8(&content[EvtSystemProviderName], &log->ops.provider);
wevt_get_uuid_by_type(&content[EvtSystemProviderGuid], &ev->provider);
wevt_get_uuid_by_type(&content[EvtSystemActivityID], &ev->activity_id);
wevt_get_uuid_by_type(&content[EvtSystemRelatedActivityID], &ev->related_activity_id);
wevt_field_get_sid(&content[EvtSystemUserID], &log->ops.account, &log->ops.domain, &log->ops.sid);
PROVIDER_META_HANDLE *p = log->provider =
provider_get(ev->provider, content[EvtSystemProviderName].StringVal);
ev->platform = provider_get_platform(p);
wevt_get_level(log, ev, p);
wevt_get_task(log, ev, p);
wevt_get_opcode(log, ev, p);
wevt_get_keyword(log, ev, p);
if(log->type & WEVT_QUERY_EVENT_DATA && wEvtRender(log, log->hRenderUserContext, &log->ops.raw.user)) {
#if (ON_FTS_PRELOAD_MESSAGE == 1)
EvtFormatMessage_Event_utf8(&log->ops.unicode, log->provider, log->hEvent, &log->ops.event);
#endif
#if (ON_FTS_PRELOAD_XML == 1)
EvtFormatMessage_Xml_utf8(&log->ops.unicode, log->provider, log->hEvent, &log->ops.xml);
#endif
#if (ON_FTS_PRELOAD_EVENT_DATA == 1)
for(size_t i = 0; i < log->ops.raw.user.count ;i++)
evt_variant_to_buffer(log->ops.event_data, &log->ops.raw.user.data[i], " ||| ");
#endif
}
}
ret = true;
cleanup:
return ret;
}
bool wevt_get_next_event(WEVT_LOG *log, WEVT_EVENT *ev) {
DWORD size = (log->type & WEVT_QUERY_EXTENDED) ? BATCH_NEXT_EVENT : 1;
DWORD max_failures = 10;
fatal_assert(log && log->hQuery && log->hRenderSystemContext);
while(max_failures > 0) {
if (log->batch.used >= log->batch.size) {
log->batch.size = 0;
log->batch.used = 0;
DWORD err;
if(!EvtNext(log->hQuery, size, log->batch.hEvents, INFINITE, 0, &log->batch.size)) {
err = GetLastError();
if(err == ERROR_NO_MORE_ITEMS)
return false; // no data available, return failure
}
if(!log->batch.size) {
if(size == 1) {
nd_log(NDLS_COLLECTORS, NDLP_ERR,
"EvtNext() failed, hQuery: 0x%lx, size: %zu, extended info: %s",
(uintptr_t)log->hQuery, (size_t)size, EvtGetExtendedStatus_utf8());
return false;
}
// EvtNext() returns true when it can full the array
// so, let's retry with a smaller array.
size /= 2;
if(size < 1) size = 1;
continue;
}
}
log->query_stats.event_count++;
log->log_stats.event_count++;
// cleanup any previous event data
wevt_event_done(log);
log->hEvent = log->batch.hEvents[log->batch.used];
log->batch.hEvents[log->batch.used] = NULL;
log->batch.used++;
if(wevt_get_next_event_one(log, ev))
return true;
else {
log->query_stats.failed_count++;
log->log_stats.failed_count++;
max_failures--;
}
}
return false;
}
static void wevt_event_done(WEVT_LOG *log) {
if (log->provider) {
provider_release(log->provider);
log->provider = NULL;
}
if (log->hEvent) {
EvtClose(log->hEvent);
log->hEvent = NULL;
}
log->ops.channel.src = TXT_SOURCE_UNKNOWN;
log->ops.provider.src = TXT_SOURCE_UNKNOWN;
log->ops.computer.src = TXT_SOURCE_UNKNOWN;
log->ops.account.src = TXT_SOURCE_UNKNOWN;
log->ops.domain.src = TXT_SOURCE_UNKNOWN;
log->ops.sid.src = TXT_SOURCE_UNKNOWN;
log->ops.event.src = TXT_SOURCE_UNKNOWN;
log->ops.level.src = TXT_SOURCE_UNKNOWN;
log->ops.keywords.src = TXT_SOURCE_UNKNOWN;
log->ops.opcode.src = TXT_SOURCE_UNKNOWN;
log->ops.task.src = TXT_SOURCE_UNKNOWN;
log->ops.xml.src = TXT_SOURCE_UNKNOWN;
log->ops.channel.used = 0;
log->ops.provider.used = 0;
log->ops.computer.used = 0;
log->ops.account.used = 0;
log->ops.domain.used = 0;
log->ops.sid.used = 0;
log->ops.event.used = 0;
log->ops.level.used = 0;
log->ops.keywords.used = 0;
log->ops.opcode.used = 0;
log->ops.task.used = 0;
log->ops.xml.used = 0;
if(log->ops.event_data)
log->ops.event_data->len = 0;
}
// --------------------------------------------------------------------------------------------------------------------
// Query management
bool wevt_query(WEVT_LOG *log, LPCWSTR channel, LPCWSTR query, EVT_QUERY_FLAGS direction) {
wevt_query_done(log);
log->log_stats.queries_count++;
EVT_HANDLE hQuery = EvtQuery(NULL, channel, query, EvtQueryChannelPath | (direction & (EvtQueryReverseDirection | EvtQueryForwardDirection)) | EvtQueryTolerateQueryErrors);
if (!hQuery) {
nd_log(NDLS_COLLECTORS, NDLP_ERR, "EvtQuery() failed, query: %s | extended info: %s",
query2utf8(query), EvtGetExtendedStatus_utf8());
log->log_stats.queries_failed++;
return false;
}
log->hQuery = hQuery;
return true;
}
void wevt_query_done(WEVT_LOG *log) {
// close the last working hEvent
wevt_event_done(log);
// close all batched hEvents
for(DWORD i = log->batch.used; i < log->batch.size ;i++) {
if(log->batch.hEvents[i])
EvtClose(log->batch.hEvents[i]);
log->batch.hEvents[i] = NULL;
}
log->batch.used = 0;
log->batch.size = 0;
if (log->hQuery) {
EvtClose(log->hQuery);
log->hQuery = NULL;
}
log->query_stats.event_count = 0;
log->query_stats.failed_count = 0;
}
// --------------------------------------------------------------------------------------------------------------------
// Log management
WEVT_LOG *wevt_openlog6(WEVT_QUERY_TYPE type) {
WEVT_LOG *log = callocz(1, sizeof(*log));
log->type = type;
// create the system render
log->hRenderSystemContext = EvtCreateRenderContext(0, NULL, EvtRenderContextSystem);
if (!log->hRenderSystemContext) {
nd_log(NDLS_COLLECTORS, NDLP_ERR,
"EvtCreateRenderContext() on system context failed, extended info: %s",
EvtGetExtendedStatus_utf8());
goto cleanup;
}
if(type & WEVT_QUERY_EVENT_DATA) {
log->hRenderUserContext = EvtCreateRenderContext(0, NULL, EvtRenderContextUser);
if (!log->hRenderUserContext) {
nd_log(NDLS_COLLECTORS, NDLP_ERR,
"EvtCreateRenderContext failed, on user context failed, extended info: %s",
EvtGetExtendedStatus_utf8());
goto cleanup;
}
log->ops.event_data = buffer_create(4096, NULL);
}
return log;
cleanup:
wevt_closelog6(log);
return NULL;
}
void wevt_closelog6(WEVT_LOG *log) {
wevt_query_done(log);
if (log->hRenderSystemContext)
EvtClose(log->hRenderSystemContext);
if (log->hRenderUserContext)
EvtClose(log->hRenderUserContext);
wevt_variant_cleanup(&log->ops.raw.system);
wevt_variant_cleanup(&log->ops.raw.user);
txt_utf16_cleanup(&log->ops.unicode);
txt_utf8_cleanup(&log->ops.channel);
txt_utf8_cleanup(&log->ops.provider);
txt_utf8_cleanup(&log->ops.computer);
txt_utf8_cleanup(&log->ops.account);
txt_utf8_cleanup(&log->ops.domain);
txt_utf8_cleanup(&log->ops.sid);
txt_utf8_cleanup(&log->ops.event);
txt_utf8_cleanup(&log->ops.level);
txt_utf8_cleanup(&log->ops.keywords);
txt_utf8_cleanup(&log->ops.opcode);
txt_utf8_cleanup(&log->ops.task);
txt_utf8_cleanup(&log->ops.xml);
buffer_free(log->ops.event_data);
freez(log);
}
// --------------------------------------------------------------------------------------------------------------------
// Retention
bool wevt_channel_retention(WEVT_LOG *log, const wchar_t *channel, const wchar_t *query, EVT_RETENTION *retention) {
bool ret = false;
// get the number of the oldest record in the log
// "EvtGetLogInfo()" does not work properly with "EvtLogOldestRecordNumber"
// we have to get it from the first EventRecordID
// query the eventlog
log->hQuery = EvtQuery(NULL, channel, query, EvtQueryChannelPath | EvtQueryForwardDirection | EvtQueryTolerateQueryErrors);
if (!log->hQuery) {
if (GetLastError() == ERROR_EVT_CHANNEL_NOT_FOUND)
nd_log(NDLS_COLLECTORS, NDLP_ERR, "EvtQuery() for retention failed, channel '%s' not found, cannot get retention, extended info: %s",
channel2utf8(channel), EvtGetExtendedStatus_utf8());
else
nd_log(NDLS_COLLECTORS, NDLP_ERR, "EvtQuery() for retention on channel '%s' failed, cannot get retention, extended info: %s",
channel2utf8(channel), EvtGetExtendedStatus_utf8());
goto cleanup;
}
if (!wevt_get_next_event(log, &retention->first_event))
goto cleanup;
if (!retention->first_event.id) {
// no data in the event log
retention->first_event = retention->last_event = WEVT_EVENT_EMPTY;
ret = true;
goto cleanup;
}
EvtClose(log->hQuery);
log->hQuery = EvtQuery(NULL, channel, query, EvtQueryChannelPath | EvtQueryReverseDirection | EvtQueryTolerateQueryErrors);
if (!log->hQuery) {
if (GetLastError() == ERROR_EVT_CHANNEL_NOT_FOUND)
nd_log(NDLS_COLLECTORS, NDLP_ERR, "EvtQuery() for retention failed, channel '%s' not found, extended info: %s",
channel2utf8(channel), EvtGetExtendedStatus_utf8());
else
nd_log(NDLS_COLLECTORS, NDLP_ERR, "EvtQuery() for retention on channel '%s' failed, extended info: %s",
channel2utf8(channel), EvtGetExtendedStatus_utf8());
goto cleanup;
}
if (!wevt_get_next_event(log, &retention->last_event) || retention->last_event.id == 0) {
// no data in eventlog
retention->last_event = retention->first_event;
}
retention->last_event.id += 1; // we should read the last record
ret = true;
cleanup:
wevt_query_done(log);
if(ret) {
retention->entries = (channel && !query) ? retention->last_event.id - retention->first_event.id : 0;
if(retention->last_event.created_ns >= retention->first_event.created_ns)
retention->duration_ns = retention->last_event.created_ns - retention->first_event.created_ns;
else
retention->duration_ns = retention->first_event.created_ns - retention->last_event.created_ns;
retention->size_bytes = wevt_log_file_size(channel);
}
else
memset(retention, 0, sizeof(*retention));
return ret;
}
static uint64_t wevt_log_file_size(const wchar_t *channel) {
EVT_HANDLE hLog = NULL;
EVT_VARIANT evtVariant;
DWORD bufferUsed = 0;
uint64_t file_size = 0;
// Open the event log channel
hLog = EvtOpenLog(NULL, channel, EvtOpenChannelPath);
if (!hLog) {
nd_log(NDLS_COLLECTORS, NDLP_ERR, "EvtOpenLog() on channel '%s' failed, extended info: %s",
channel2utf8(channel), EvtGetExtendedStatus_utf8());
goto cleanup;
}
// Get the file size of the log
if (!EvtGetLogInfo(hLog, EvtLogFileSize, sizeof(evtVariant), &evtVariant, &bufferUsed)) {
nd_log(NDLS_COLLECTORS, NDLP_ERR, "EvtGetLogInfo() on channel '%s' failed, extended info: %s",
channel2utf8(channel), EvtGetExtendedStatus_utf8());
goto cleanup;
}
// Extract the file size from the EVT_VARIANT structure
file_size = evtVariant.UInt64Val;
cleanup:
if (hLog)
EvtClose(hLog);
return file_size;
}
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