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rule options 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 rule options rule options are the heart and soul of a snort rule as they determine if a given packet should be passed along to its destination or if it should instead be stopped in its tracks each rule option has its own set of option specific critera but they all follow the same general structure first all rule options are enclosed in parentheses after the rule header then each rule option is declared with its name followed optionally by a character and any option specific criteria lastly each rule option is terminated with a character it s important to note that not all options have arguments and some options have multiple arguments that are separated by commas there are four major categories of rule options general options provide additional context for a given rule payload options set payload specific criteria non payload options set non payload specific criteria post detection options set actions to take on a given packet after the rule has fired all of these are discussed in great detail later in the manual but here are a few example options and their specific structure this is an example of a buffer modifier http_uri it tells snort to look for subsequent content matches only in that buffer http_uri content match specific criteria as well as others require double quotes content web_form php not all options have criteria that require quotes service http some options require specifying a sub option reference url www example com