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597a4d6704
- policy/ renamed to scripts/ - By default BROPATH now contains: - scripts/ - scripts/policy - scripts/site - *Nearly* all tests pass. - All of scripts/base/ is loaded by main.cc - Can be disabled by setting $BRO_NO_BASE_SCRIPTS - Scripts in scripts/base/ don't use relative path loading to ease use of BRO_NO_BASE_SCRIPTS (to copy and paste that script). - The scripts in scripts/base/protocols/ only (or soon will only) do logging and state building. - The scripts in scripts/base/frameworks/ add functionality without causing any additional overhead. - All "detection" activity happens through scripts in scripts/policy/. - Communications framework modified temporarily to need an environment variable to actually enable (ENABLE_COMMUNICATION=1) - This is so the communications framework can be loaded as part of the base without causing trouble when it's not needed. - This will be removed once a resolution to ticket #540 is reached.
54 lines
1.7 KiB
Text
54 lines
1.7 KiB
Text
##! Functions to assist with small string analysis and manipulation that can
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##! be implemented as Bro functions and don't need to be implemented as built
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##! in functions.
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## Returns true if the given string is at least 25% composed of 8-bit
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## characters.
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function is_string_binary(s: string): bool
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{
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return byte_len(gsub(s, /[\x00-\x7f]/, "")) * 100 / |s| >= 25;
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}
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## Joins a set of string together, with elements delimited by a constant string.
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## ss: a set of strings to join
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## j: the string used to join set elements
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## Returns: a string composed of the all elements of the set, delimited by the
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## joining string.
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function join_string_set(ss: set[string], j: string): string
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{
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local output="";
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local i=0;
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for ( s in ss )
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{
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if ( i > 0 )
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output = cat(output, j);
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output = cat(output, s);
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++i;
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}
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return output;
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}
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## Given a string, returns an escaped version.
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## s: a string to escape
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## chars: a string containing all the characters that need to be escaped
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## Returns: a string with all occurrences of any character in ``chars`` escaped
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## using ``\``, and any literal ``\`` characters likewise escaped.
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function string_escape(s: string, chars: string): string
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{
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s = subst_string(s, "\\", "\\\\");
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for ( c in chars )
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s = subst_string(s, c, cat("\\", c));
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return s;
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}
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## Cut a number of character from the end of the given string.
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## s: a string to trim
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## tail_len: the number of characters to remove from end of string
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## Returns: the string in ``s`` with ``tail_len`` characters removed from end
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function cut_tail(s: string, tail_len: count): string
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{
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if ( tail_len > |s| )
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tail_len = |s|;
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return sub_bytes(s, 1, int_to_count(|s| - tail_len));
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}
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