/*
* After a query, server sends a list of column name with their types
*
* | 1 byte | 1 byte | 0-8 bytes | variable bytes |
* | Length | Size number of fields | Number fields | unknown flags and fields |
*/
static enum proto_parse_status tns_parse_row_description_prefix(struct tns_parser *tns_parser, struct sql_proto_info *info, struct cursor *cursor)
{
enum proto_parse_status status;
SLOG(LOG_DEBUG, "Parsing row description prefix");
CHECK(1);
unsigned length = cursor_read_u8(cursor);
DROP_FIX(cursor, length);
DROP_VAR(cursor);
if (PROTO_OK != (status = read_field_count(tns_parser, info, cursor))) return status;
DROP_FIX(cursor, 1);
for (unsigned i = 0; i < info->u.query.nb_fields; i++) {
DROP_FIX(cursor, 3);
DROP_VARS(cursor, 4);
DROP_DALC(cursor);
DROP_VARS(cursor, 2);
DROP_FIX(cursor, 1);
DROP_VAR(cursor);
DROP_FIX(cursor, 2);
for (unsigned i = 0; i < 3; ++i) {
DROP_DALC(cursor);
}
DROP_VAR(cursor);
}
DROP_DALC(cursor);
DROP_VARS(cursor, 2);
return PROTO_OK;
}
static enum proto_parse_status tns_parse_sql_query_jdbc(struct sql_proto_info *info, struct cursor *cursor)
{
SLOG(LOG_DEBUG, "Parsing a jdbc query");
enum proto_parse_status status;
DROP_FIX(cursor, 1);
uint_least64_t sql_len;
status = cursor_read_variable_int(cursor, &sql_len);
if (status != PROTO_OK) return status;
SLOG(LOG_DEBUG, "Size sql %zu", sql_len);
DROP_FIX(cursor, 1);
// We have a number of fields at the end of the query
uint_least64_t end_len;
status = cursor_read_variable_int(cursor, &end_len);
if (status != PROTO_OK) return status;
DROP_FIX(cursor, 2);
DROP_VARS(cursor, 3);
DROP_FIX(cursor, 1);
DROP_VAR(cursor);
DROP_FIX(cursor, 6);
DROP_VAR(cursor);
char *sql = "";
if (sql_len > 0) {
// Some unknown bytes
while (cursor->cap_len > 1 && !isprint(cursor_peek_u8(cursor, 1))) {
cursor_drop(cursor, 1);
}
CHECK(1);
if (sql_len > 0xff && 0xff == cursor_peek_u8(cursor, 0)) {
SLOG(LOG_DEBUG, "Looks like prefixed length chunks of size 0xff...");
status = cursor_read_chunked_string(cursor, &sql, 0xff);
} else if (sql_len > 0x40 && 0x40 == cursor_peek_u8(cursor, 1)) {
SLOG(LOG_DEBUG, "Looks like prefixed length chunks of size 0x40...");
cursor_drop(cursor, 1);
status = cursor_read_chunked_string(cursor, &sql, 0x40);
} else {
if (!isprint(cursor_peek_u8(cursor, 0))) {
cursor_drop(cursor, 1);
}
SLOG(LOG_DEBUG, "Looks like a fixed string of size %zu", sql_len);
status = cursor_read_fixed_string(cursor, &sql, sql_len);
}
if (status != PROTO_OK) return status;
}
SLOG(LOG_DEBUG, "Sql parsed: %s", sql);
sql_set_query(info, "%s", sql);
SLOG(LOG_DEBUG, "Skipping %zu end variable fields", end_len);
DROP_VARS(cursor, end_len);
return PROTO_OK;
}
/*
* | 1 byte | (length + 1) * variable | 1 + 0-8 bytes | nb_ignore * variable | Variable until new ttc |
* | length | ? | Nb ignore | ? | ? |
*/
static enum proto_parse_status tns_parse_row_description(struct cursor *cursor)
{
enum proto_parse_status status;
SLOG(LOG_DEBUG, "Parsing a row description");
uint_least64_t length;
status = cursor_read_variable_int(cursor, &length);
if (status != PROTO_OK) return status;
DROP_VARS(cursor, length);
DROP_VAR(cursor);
uint_least64_t nb_ignore;
status = cursor_read_variable_int(cursor, &nb_ignore);
if (status != PROTO_OK) return status;
for (unsigned i = 0; i < nb_ignore; i++) {
DROP_VAR(cursor);
DROP_DALC(cursor);
DROP_VAR(cursor);
}
CHECK(1);
// Sometimes, we have some strange bytes...
while (*cursor->head < 0x03 || *cursor->head > 0x15) {
CHECK(2);
DROP_FIX(cursor, 1);
}
return PROTO_OK;
}
static enum proto_parse_status tns_parse_sql_query_oci(struct sql_proto_info *info, struct cursor *cursor)
{
SLOG(LOG_DEBUG, "Parsing an oci query");
enum proto_parse_status status;
char pattern[] = {0xfe, MAX_OCI_CHUNK};
uint8_t const *new_head = memmem(cursor->head, cursor->cap_len, pattern, sizeof(pattern));
if (new_head != NULL) {
size_t gap_size = new_head - cursor->head;
SLOG(LOG_DEBUG, "%zu bytes before sql", gap_size);
DROP_FIX(cursor, gap_size + 1);
} else {
SLOG(LOG_DEBUG, "{0xfe 0x40} not found, size might be < 0x40");
if (!lookup_query(cursor)) return PROTO_PARSE_ERR;
}
char *sql;
if (PROTO_OK != (status = cursor_read_chunked_string(cursor, &sql, MAX_OCI_CHUNK))) return status;
SLOG(LOG_DEBUG, "Sql parsed: %s", sql);
sql_set_query(info, "%s", sql);
// Drop the rest
if(cursor->cap_len > 0) cursor_drop(cursor, cursor->cap_len - 1);
return PROTO_OK;
}
static enum proto_parse_status tns_parse_close_statement(struct cursor *cursor)
{
SLOG(LOG_DEBUG, "Parsing a close statement");
// Subcode
DROP_FIX(cursor, 1);
// Sequence
DROP_FIX(cursor, 1);
// Pointer
DROP_FIX(cursor, 1);
// We seek the next query
uint8_t marker[2] = {0x03, 0x5e};
if (cursor_drop_until(cursor, marker, sizeof(marker), cursor->cap_len) < 0) return PROTO_PARSE_ERR;
SLOG(LOG_DEBUG, "Found a possible query ttc, exiting close statement");
return PROTO_OK;
}
static enum proto_parse_status tns_parse_sql_query(struct sql_proto_info *info, struct cursor *cursor)
{
DROP_FIX(cursor, 1);
if (is_oci(cursor)) {
// Option is not prefix based, seems like an oci query
return tns_parse_sql_query_oci(info, cursor);
} else {
return tns_parse_sql_query_jdbc(info, cursor);
}
}
static enum proto_parse_status tns_parse_login_property(struct sql_proto_info *info, struct cursor *cursor)
{
SLOG(LOG_DEBUG, "Parsing tns login property");
// We are only interested in response
if (info->is_query) return PROTO_OK;
if (info->msg_type != SQL_UNKNOWN && info->msg_type != SQL_STARTUP) return PROTO_PARSE_ERR;
// Drop Server version
DROP_FIX(cursor, 3);
// Drop Server version text
uint8_t marker = 0x00;
enum proto_parse_status status = cursor_drop_until(cursor, &marker, sizeof(marker));
if (status != PROTO_OK) return status;
// Drop Null byte
DROP_FIX(cursor, 1);
CHECK(2);
uint16_t charset = cursor_read_u16le(cursor);
SLOG(LOG_DEBUG, "Found a charset of 0x%02x", charset);
switch (charset) {
case 0x01:
case 0x02:
case 0x1f:
case 0xb2:
sql_set_encoding(info, SQL_ENCODING_LATIN1);
break;
case 0x366:
case 0x367:
case 0x369:
sql_set_encoding(info, SQL_ENCODING_UTF8);
break;
default:
SLOG(LOG_DEBUG, "Unknown charset");
break;
}
// We don't care of the rest...
cursor_drop(cursor, cursor->cap_len);
return PROTO_OK;
}
/*
* | 1 byte | 1 + 0-8 bytes | up to 5 vars |
* | Flag | Number column | unknown |
*/
static enum proto_parse_status tns_parse_row_prefix(struct tns_parser *tns_parser,
struct sql_proto_info *info, struct cursor *cursor)
{
enum proto_parse_status status;
SLOG(LOG_DEBUG, "Parsing Row prefix");
DROP_FIX(cursor, 1);
if (PROTO_OK != (status = read_field_count(tns_parser, info, cursor))) return status;
for (unsigned i = 0; i < 5; i++) {
CHECK(1);
char c = cursor_peek_u8(cursor, 0);
if (c == TTC_ROW_DATA || c == TTC_END_MESSAGE) return PROTO_OK;
DROP_VAR(cursor);
}
return PROTO_OK;
}
static enum proto_parse_status tns_parse_row_recap(struct cursor *cursor)
{
enum proto_parse_status status;
SLOG(LOG_DEBUG, "Parsing Row recap");
/* A row recap contains :
* - 1 var number of column sent
* - <number of fields> bytes to ignore
*/
uint_least64_t num_fields;
status = cursor_read_variable_int(cursor, &num_fields);
if (status != PROTO_OK) return status;
unsigned nb_ignore = (num_fields + 7) / 8;
DROP_FIX(cursor, nb_ignore);
return PROTO_OK;
}
static enum proto_parse_status tns_parse_row_prefix(struct tns_parser *tns_parser,
struct sql_proto_info *info, struct cursor *cursor)
{
enum proto_parse_status status;
SLOG(LOG_DEBUG, "Parsing Row prefix");
/* A row prefix contains
* - 1 byte flag
* - Number column
* - 5 var
*/
DROP_FIX(cursor, 1);
if (PROTO_OK != (status = read_field_count(tns_parser, info, cursor))) return status;
DROP_VARS(cursor, 5);
return PROTO_OK;
}
static enum proto_parse_status tns_parse_sql_query(struct sql_proto_info *info, struct cursor *cursor)
{
DROP_FIX(cursor, 1);
if (is_oci(cursor)) {
// Option is not prefix based, seems like an oci query
return tns_parse_sql_query_oci(info, cursor);
} else {
struct cursor save_cursor = *cursor;
if (tns_parse_sql_query_jdbc(info, cursor) != PROTO_OK) {
// Fallback to query guessing
SLOG(LOG_DEBUG, "jdbc query failed, fallback to oci");
*cursor = save_cursor;
return tns_parse_sql_query_oci(info, cursor);
} else {
return PROTO_OK;
}
}
}
/*
* Sometimes, we have up to 10 {0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff} patterns.
* Skip them to avoid breaking on an eventual 0x07 (TTC_ROW_DATA)
* The query size seems to be at the end of the first pattern
*/
static uint8_t parse_query_header(struct cursor *cursor)
{
uint8_t const *new_head = cursor->head;
uint8_t query_size = 0;
for (unsigned i = 0; i < 10 && new_head; i++) {
char pattern[8] = {0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
new_head = memmem(cursor->head, cursor->cap_len, pattern, sizeof(pattern));
if (new_head) {
size_t gap_size = new_head - cursor->head;
DROP_FIX(cursor, gap_size + sizeof(pattern));
if (i == 0) {
CHECK(1);
query_size = cursor_read_u8(cursor);
SLOG(LOG_DEBUG, "Found potential query size: %d", query_size);
}
}
};
return query_size;
}
static enum proto_parse_status tns_parse_sql_query_oci(struct sql_proto_info *info, struct cursor *cursor)
{
SLOG(LOG_DEBUG, "Parsing an oci query");
uint8_t query_size = parse_query_header(cursor);
struct query_candidate candidate = {.num_candidate_size = 0};
if (query_size > 0) {
candidate.candidate_sizes[candidate.num_candidate_size++] = query_size;
}
bool has_query = lookup_query(cursor, &candidate);
info->u.query.sql[0] = '\0';
info->u.query.truncated = 0;
if (has_query) {
SLOG(LOG_DEBUG, "Found a query, parsing it");
if (candidate.is_chunked) {
cursor_read_chunked_string(cursor, info->u.query.sql, sizeof(info->u.query.sql), MAX_OCI_CHUNK);
} else {
cursor_read_fixed_string(cursor, info->u.query.sql, sizeof(info->u.query.sql), candidate.query_size);
}
}
SLOG(LOG_DEBUG, "Sql parsed: %s", info->u.query.sql);
info->set_values |= SQL_SQL;
// Drop the rest
if(cursor->cap_len > 0) cursor_drop(cursor, cursor->cap_len - 1);
return PROTO_OK;
}
/*
* | 1 byte | 1 + 0-8 bytes | 1 byte | 1 + 0-4 bytes | Lots of unknown bytes | variable |
* | Unk | Sql len | Unk | Num end fields | Unk | sql query |
*/
static enum proto_parse_status tns_parse_sql_query_jdbc(struct sql_proto_info *info, struct cursor *cursor)
{
SLOG(LOG_DEBUG, "Parsing a jdbc query");
enum proto_parse_status status = PROTO_OK;
DROP_FIX(cursor, 1);
uint_least64_t sql_len;
if (PROTO_OK != (status = cursor_read_variable_int(cursor, &sql_len))) return status;
SLOG(LOG_DEBUG, "Size sql %zu", sql_len);
DROP_FIX(cursor, 1);
DROP_VAR(cursor);
DROP_FIX(cursor, 2);
info->u.query.sql[0] = '\0';
info->u.query.truncated = 0; // TODO Handle truncated
if (sql_len > 0) {
// Some unknown bytes
while (cursor->cap_len > 1 && PROTO_OK != is_range_print(cursor, MIN(MIN_QUERY_SIZE, sql_len), 1)) {
// TODO drop to the first non printable
cursor_drop(cursor, 1);
}
CHECK(1);
if (sql_len > 0xff && 0xff == cursor_peek_u8(cursor, 0)) {
SLOG(LOG_DEBUG, "Looks like prefixed length chunks of size 0xff...");
status = cursor_read_chunked_string(cursor, info->u.query.sql, sizeof(info->u.query.sql), 0xff);
} else if (sql_len > MAX_OCI_CHUNK && MAX_OCI_CHUNK == cursor_peek_u8(cursor, 0)) {
SLOG(LOG_DEBUG, "Looks like prefixed length chunks of size 0x40...");
status = cursor_read_chunked_string(cursor, info->u.query.sql, sizeof(info->u.query.sql),
MAX_OCI_CHUNK);
} else {
// We don't care about the first non printable character
cursor_drop(cursor, 1);
CHECK(1);
// In rare occurrence where sql_len == first character, we check the byte after the expected query,
// if it's printable, the first character is probably the prefixed size.
if (cursor_peek_u8(cursor, 0) == sql_len && sql_len < cursor->cap_len && is_print(cursor_peek_u8(cursor, sql_len)))
cursor_drop(cursor, 1);
SLOG(LOG_DEBUG, "Looks like a fixed string of size %zu", sql_len);
int written_bytes = cursor_read_fixed_string(cursor, info->u.query.sql,
sizeof(info->u.query.sql), sql_len);
if (written_bytes < 0) return PROTO_TOO_SHORT;
}
if (status != PROTO_OK) return status;
}
SLOG(LOG_DEBUG, "Sql parsed: %s", info->u.query.sql);
info->set_values |= SQL_SQL;
return PROTO_OK;
}
static enum proto_parse_status tns_parse_end(struct sql_proto_info *info, struct cursor *cursor)
{
SLOG(LOG_DEBUG, "Parsing tns end packet");
enum proto_parse_status status;
uint_least64_t var[6];
for (unsigned i = 0; i < 6; i++) {
if (PROTO_OK != (status = cursor_read_variable_int(cursor, var + i))) return status;
}
uint_least64_t nb_rows;
uint_least64_t error_code;
// let's use the double 0x00 to guess the position of row number and error code
if (var[0] > 0 && var[4] == 0 && var[5] == 0) {
// var[0] is unknown?
// var[1] == sequence
// var[2] == rows
// var[3] == error code
SLOG(LOG_DEBUG, "Unknown bits after ttc code");
nb_rows = var[2];
error_code = var[3];
DROP_VAR(cursor);
} else if (var[3] == 0 && var[4] == 0) {
// var[0] == sequence
// var[1] == rows
// var[2] == error code
nb_rows = var[1];
error_code = var[2];
} else {
// var[0] == rows
// var[1] == error code
nb_rows = var[0];
error_code = var[1];
}
if (info->msg_type == SQL_QUERY) {
sql_set_row_count(info, nb_rows);
SLOG(LOG_DEBUG, "Nb rows %d", info->u.query.nb_rows);
}
SLOG(LOG_DEBUG, "Error code is %zu", error_code);
DROP_VARS(cursor, 1);
DROP_FIX(cursor, 2);
DROP_VARS(cursor, 2);
DROP_FIX(cursor, 2);
DROP_VARS(cursor, 2);
DROP_FIX(cursor, 1);
DROP_VARS(cursor, 3);
if (error_code != 0) {
SLOG(LOG_DEBUG, "Parsing error message");
char *error_msg = tempstr();
unsigned error_len;
// Drop an unknown number of bytes here
while(cursor->cap_len > 2 && (cursor_peek_u8(cursor, 0) == 0 || !is_print(cursor_peek_u8(cursor, 1)))){
DROP_FIX(cursor, 1);
}
SLOG(LOG_DEBUG, "First printable char is %c", cursor_peek_u8(cursor, 1));
status = cursor_read_variable_string(cursor, error_msg, TEMPSTR_SIZE, &error_len);
if (status != PROTO_OK) return status;
if (error_len < 12) return PROTO_PARSE_ERR;
// Split "ORA-XXXX: msg"
// Part before : is the error code
// Part after is the localized message
char *colon_pos = memchr(error_msg, ':', error_len);
sql_set_request_status(info, SQL_REQUEST_ERROR);
if (colon_pos) {
// We extract the error code
unsigned error_code_size = colon_pos - error_msg;
int size_err = MIN(error_code_size, sizeof(info->error_code));
memcpy(info->error_code, error_msg, size_err);
info->error_code[size_err] = '\0';
info->set_values |= SQL_ERROR_CODE;
if (0 == strcmp("ORA-01403", info->error_code))
info->request_status = SQL_REQUEST_COMPLETE;
// We skip ':' in errror message
char const *start_message = colon_pos + 1;
// We skip spaces before errror message
while (start_message < error_len + error_msg && *start_message == ' ')
start_message++;
copy_string(info->error_message, start_message, sizeof(info->error_message));
info->set_values |= SQL_ERROR_MESSAGE;
} else {
copy_string(info->error_message, error_msg, sizeof(info->error_message));
info->set_values |= SQL_ERROR_MESSAGE;
}
}
return PROTO_OK;
}
static enum proto_parse_status tns_parse_end(struct sql_proto_info *info, struct cursor *cursor)
{
SLOG(LOG_DEBUG, "Parsing tns end packet");
enum proto_parse_status status;
uint_least64_t var0;
uint_least64_t var1;
uint_least64_t var2;
uint_least64_t var3;
uint_least64_t var4;
uint_least64_t var5;
if (PROTO_OK != (status = cursor_read_variable_int(cursor, &var0))) return status;
if (PROTO_OK != (status = cursor_read_variable_int(cursor, &var1))) return status;
if (PROTO_OK != (status = cursor_read_variable_int(cursor, &var2))) return status;
if (PROTO_OK != (status = cursor_read_variable_int(cursor, &var3))) return status;
if (PROTO_OK != (status = cursor_read_variable_int(cursor, &var4))) return status;
if (PROTO_OK != (status = cursor_read_variable_int(cursor, &var5))) return status;
uint_least64_t nb_rows;
uint_least64_t error_code;
if (var0 != 0 && var4 == 0 && var5 == 0) {
// First var is unknown?
SLOG(LOG_DEBUG, "Unknown bits after ttc code");
nb_rows = var2;
error_code = var3;
DROP_VAR(cursor);
} else {
// var0 == sequence
// var1 == rows
// var2 == error code
nb_rows = var1;
error_code = var2;
}
if (info->msg_type == SQL_QUERY) {
sql_set_row_count(info, nb_rows);
SLOG(LOG_DEBUG, "Nb rows %d", info->u.query.nb_rows);
}
SLOG(LOG_DEBUG, "Error code is %zu", error_code);
DROP_VARS(cursor, 1);
DROP_FIX(cursor, 2);
DROP_VARS(cursor, 2);
DROP_FIX(cursor, 2);
DROP_VARS(cursor, 2);
DROP_FIX(cursor, 1);
DROP_VARS(cursor, 3);
DROP_FIX(cursor, 2);
DROP_VARS(cursor, 2);
if (error_code != 0) {
SLOG(LOG_DEBUG, "Parsing error message");
char *error_msg;
unsigned error_len;
// Drop an unknown number of column here
while(cursor->cap_len > 1 && !isprint(*(cursor->head + 1))){
DROP_FIX(cursor, 1);
}
status = cursor_read_variable_string(cursor, &error_msg, &error_len);
if (status != PROTO_OK) return status;
// Split "ORA-XXXX: msg"
// Part before : is the error code
// Part after is the localized message
char *colon_pos = memchr(error_msg, ':', error_len);
sql_set_request_status(info, SQL_REQUEST_ERROR);
if (colon_pos) {
// We extract the error code
unsigned error_code_size = colon_pos - error_msg;
int size_err = MIN(error_code_size, sizeof(info->error_code));
memcpy(info->error_code, error_msg, size_err);
info->error_code[size_err] = '\0';
info->set_values |= SQL_ERROR_CODE;
if (0 == strcmp("ORA-01403", info->error_code))
info->request_status = SQL_REQUEST_COMPLETE;
// We skip ':' in errror message
char const *start_message = colon_pos + 1;
// We skip spaces before errror message
while (start_message < error_len + error_msg && *start_message == ' ')
start_message++;
copy_string(info->error_message, start_message, sizeof(info->error_message));
info->set_values |= SQL_ERROR_MESSAGE;
} else {
copy_string(info->error_message, error_msg, sizeof(info->error_message));
info->set_values |= SQL_ERROR_MESSAGE;
}
}
return PROTO_OK;
}
