static enum proto_parse_status tns_parse(struct parser *parser, struct proto_info *parent, unsigned way, uint8_t const *payload, size_t cap_len, size_t wire_len, struct timeval const *now, size_t tot_cap_len, uint8_t const *tot_packet)
{
struct tns_parser *tns_parser = DOWNCAST(parser, parser, tns_parser);
enum proto_parse_status const status = streambuf_add(&tns_parser->sbuf, parser, parent, way, payload, cap_len, wire_len, now, tot_cap_len, tot_packet);
return status;
}
static enum proto_parse_status tds_parse(struct parser *parser, struct proto_info *parent, unsigned way, uint8_t const *payload, size_t cap_len, size_t wire_len, struct timeval const *now, size_t tot_cap_len, uint8_t const *tot_packet)
{
struct tds_parser *tds_parser = DOWNCAST(parser, parser, tds_parser);
if (cap_len == 0 && wire_len > 0) return PROTO_TOO_SHORT; // We do not know how to handle pure gaps
enum proto_parse_status const status = streambuf_add(&tds_parser->sbuf, parser, parent, way, payload, cap_len, wire_len, now, tot_cap_len, tot_packet);
return status;
}
static enum proto_parse_status tds_sbuf_parse(struct parser *parser, struct proto_info *parent, unsigned way, uint8_t const *payload, size_t cap_len, size_t wire_len, struct timeval const *now, size_t tot_cap_len, uint8_t const *tot_packet)
{
if (cap_len == 0 && wire_len > 0) return PROTO_TOO_SHORT; // We do not know how to handle pure gaps
struct tds_parser *tds_parser = DOWNCAST(parser, parser, tds_parser);
SLOG(LOG_DEBUG, "Got tds packet, data_left %zu, way %d", tds_parser->data_left, way);
bool has_gap = wire_len > cap_len;
if (tds_parser->had_gap && tds_parser->data_left > 0) {
tds_parser->data_left = wire_len > tds_parser->data_left ? 0 : tds_parser->data_left - wire_len;
SLOG(LOG_DEBUG, "Discard tds with gap, data_left %zu...", tds_parser->data_left);
timeval_reset(&tds_parser->first_ts);
return PROTO_OK;
}
tds_parser->had_gap = has_gap;
struct tds_header tds_header;
bool unknown_token = false;
struct cursor cursor;
enum proto_parse_status status;
cursor_ctor(&cursor, payload, cap_len);
struct smp_header smp_header = {.length = 0};
if (PROTO_OK != (status = tds_parse_smp_header(&cursor, &smp_header))) return status;
if (smp_header.length) {
SLOG(LOG_DEBUG, "Smp header: %s", smp_header_2_str(&smp_header));
wire_len -= SMP_PKT_HDR_LEN;
cap_len -= SMP_PKT_HDR_LEN;
if (smp_header.flags & SMP_ACK) return PROTO_OK;
}
status = tds_parse_header(&cursor, &tds_header, &unknown_token);
if (status != PROTO_OK) {
// We have an unknown token if the payload is encrypted after a ssl handshake
// It is valid but we don't know how to parse it yet
// TODO It would be better if we knew the values of the encryption options exchanged in prelogin messages
timeval_reset(&tds_parser->first_ts);
if (unknown_token) return PROTO_OK;
return status;
}
// Sanity check on pkt number
if (tds_header.pkt_number > 1 && ((tds_parser->pkt_number + 1) != tds_header.pkt_number)) {
SLOG(LOG_DEBUG, "Expected pkt number %"PRIu8", got %"PRIu8"",
tds_parser->pkt_number + 1, tds_header.pkt_number);
tds_parser->pkt_number = 1;
timeval_reset(&tds_parser->first_ts);
return PROTO_PARSE_ERR;
} else if (tds_header.pkt_number <= 1) {
SLOG(LOG_DEBUG, "Reset pkt number from %"PRIu8"", tds_parser->pkt_number);
tds_parser->pkt_number = 1;
}
// Sanity check on channels
if (tds_parser->channels[way] && (tds_parser->channels[way] != tds_header.channel)) {
SLOG(LOG_DEBUG, "Expected channel %"PRIu16", got channel %"PRIu16"",
tds_parser->channels[way], tds_header.channel);
timeval_reset(&tds_parser->first_ts);
return PROTO_PARSE_ERR;
}
if (wire_len > tds_header.len) {
SLOG(LOG_DEBUG, "Wire len %zu unexpected (> %zu), considering a gap", wire_len, tds_header.len);
has_gap = true;
}
tds_parser->data_left = wire_len >= tds_header.len ? 0 : tds_header.len - wire_len;
SLOG(LOG_DEBUG, "Data left after wire %zu", tds_parser->data_left);
if (tds_parser->data_left > 0 && !has_gap) {
SLOG(LOG_DEBUG, "Incomplete tds packet, buffering it");
if (!timeval_is_set(&tds_parser->first_ts)) {
SLOG(LOG_DEBUG, "Setting first ts to %s for way %d", timeval_2_str(now), way);
tds_parser->first_ts = *now;
}
proto_parse(NULL, parent, way, NULL, 0, 0, now, tot_cap_len, tot_packet);
streambuf_set_restart(&tds_parser->sbuf, way, payload, tds_header.len);
return PROTO_OK;
}
// We have a buffered tds packet at this point
if (!timeval_is_set(&tds_parser->first_ts)) {
SLOG(LOG_DEBUG, "Setting first ts to %s for way %d since it is not setted", timeval_2_str(now), way);
tds_parser->first_ts = *now;
}
struct tds_proto_info info;
proto_info_ctor(&info.info, parser, parent, TDS_PKT_HDR_LEN, tds_header.len - TDS_PKT_HDR_LEN);
info.type = tds_header.type;
info.status = tds_header.status;
info.length = tds_header.len;
info.first_ts = tds_parser->first_ts;
info.has_gap = has_gap;
if (tds_header.channel > 0) {
SLOG(LOG_DEBUG, "Saving channel %"PRIu16"", tds_header.channel);
tds_parser->channels[way] = tds_header.channel;
}
SLOG(LOG_DEBUG, "Saving pkt number %"PRIu8"", tds_header.pkt_number);
tds_parser->pkt_number = tds_header.pkt_number;
SLOG(LOG_DEBUG, "Parsing %s", tds_header_2_str(&tds_header));
if (! tds_parser->msg_parser) {
SLOG(LOG_DEBUG, "Building new tds_msg_parser");
tds_parser->msg_parser = proto_tds_msg->ops->parser_new(proto_tds_msg);
if (!tds_parser->msg_parser) {
SLOG(LOG_INFO, "Could not build tds msg parser");
return PROTO_PARSE_ERR;
}
}
if (tds_header.status & TDS_EOM) {
SLOG(LOG_DEBUG, "Reset pkt number from %"PRIu8" since we parsed an EOM", tds_parser->pkt_number);
tds_parser->pkt_number = 1;
}
status = proto_parse(tds_parser->msg_parser, &info.info, way,
cursor.head, cursor.cap_len, wire_len - TDS_PKT_HDR_LEN, now, tot_cap_len, tot_packet);
if (status != PROTO_OK) {
SLOG(LOG_INFO, "Tds msg parse failed, returning %s", proto_parse_status_2_str(status));
return status;
}
timeval_reset(&tds_parser->first_ts);
// Advertise this packet if it was not done already
return proto_parse(NULL, &info.info, way, payload, cap_len, wire_len, now, tot_cap_len, tot_packet);
}
static enum proto_parse_status tds_parse(struct parser *parser, struct proto_info *parent, unsigned way, uint8_t const *payload, size_t cap_len, size_t wire_len, struct timeval const *now, size_t tot_cap_len, uint8_t const *tot_packet)
{
struct tds_parser *tds_parser = DOWNCAST(parser, parser, tds_parser);
enum proto_parse_status const status = streambuf_add(&tds_parser->sbuf, parser, parent, way, payload, cap_len, wire_len, now, tot_cap_len, tot_packet);
return status;
}
/*
* Construction/Destruction
*/
static struct proto proto_tds_;
struct proto *proto_tds = &proto_tds_;
static struct port_muxer tds_tcp_muxer;
void tds_init(void)
{
log_category_proto_tds_init();
static struct proto_ops const ops = {
.parse = tds_parse,
.parser_new = tds_parser_new,
.parser_del = tds_parser_del,
.info_2_str = tds_info_2_str,
.info_addr = tds_info_addr
};
proto_ctor(&proto_tds_, &ops, "TDS", PROTO_CODE_TDS);
port_muxer_ctor(&tds_tcp_muxer, &tcp_port_muxers, 1433, 1433, proto_tds);
}
