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http_num_trailers snort 3 rule writing guide snort 3 rule writing guide introduction using snort 3 getting started with snort 3 installing snort using snort command line basics reading traffic configuration rules wizard and binder tweaks and scripts trace modules alert logging writing snort rules the basics rule headers rule actions protocols ip addresses port numbers direction operators new rule types service rules file rules file identification rules rule options rule option syntax key general rule options msg reference gid sid rev classtype priority metadata service rem file_meta payload detection rule options content fast_pattern nocase width and endian offset depth distance and within http specific options http_uri and http_raw_uri http_header and http_raw_header http_cookie and http_raw_cookie http_client_body and http_raw_body http_param http_method http_version http_stat_code http_stat_msg http_raw_request and http_raw_status http_trailer and http_raw_trailer http_true_ip http_version_match http_max_header_line http_max_trailer_line http_num_headers http_num_trailers http_num_cookies http_header_test http_trailer_test combining request and response detection bufferlen isdataat dsize pcre regex pkt_data raw_data file_data js_data vba_data base64_decode and base64_data byte_extract byte_test byte_math byte_jump ber_data and ber_skip ssl_state and ssl_version dce specific options sip specific options sd_pattern cvs md5 sha256 and sha512 gtp specific options dnp3 specific options cip specific options iec 104 specific options mms specific options modbus specific options s7commplus specific options non payload detection rule options fragoffset ttl tos id ipopts fragbits ip_proto flags flow flowbits file_type seq ack window itype icode icmp_id icmp_seq rpc stream_reassemble stream_size post detection rule options detection_filter replace tag miscellaneous information shared object rules hexdump lua snortml snort light snort dark snort 3 rule writing guide http_num_trailers snort minimum required version v3 1 24 0 the http_num_trailers rule option is used to compare the number of http trailers present in an http packet against a specific value users can check whether the total number of trailers present is less than greater than equal to not equal to less than or equal to or greater than or equal to a specified integer value additionally users can also use http_num_trailers to look for a count value that is between two numbers this is done by setting the sign to or and putting the minimum count to the left of the sign and the maximum count to the right of it the case is for an exclusive min max check while the is for an inclusive min max check valid http_num_trailers number values are 0 through 65535 inclusive format single value comparison http_num_trailers count range comparison http_num_trailers min_count max_count examples look for an http packet containing more than 100 trailers http_num_trailers 100 look for an http packet containing exactly 100 trailers http_num_trailers 100 look for an http packet containing somewhere between 50 and 100 trailers exclusive http_num_trailers 50 100