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Expand build_path() function to handle empty dir arguments gracefully

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When passing an empty string as a directory, the function would produce
filenames starting with a slash even when the given file_name is not an absolute
path. Defaulting to the root directory is likely never intended and might
conveivably be dangerous. The middle "/" is now skipped also if dir is an empty
string.
This commit is contained in:
Christian Kreibich 2022-05-13 14:18:22 -07:00
parent 4d1b9f4a08
commit 9d59a48ae2
3 changed files with 14 additions and 7 deletions
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8
scripts/base/utils/paths.zeek
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@ -28,11 +28,13 @@ function extract_path(input: string): string
## file_name: the name of the file.
##
## Returns: the concatenation of the directory path and file name, or just
## the file name if it's already an absolute path.
## the file name if it's already an absolute path or dir is empty.
function build_path(dir: string, file_name: string): string
{
return (file_name == absolute_path_pat) ?
file_name : cat(dir, "/", file_name);
# Avoid introducing "//" into the result:
local sep = ends_with(dir, "/") ? "" : "/";
return (file_name == absolute_path_pat || dir == "") ?
file_name : cat(dir, sep, file_name);
}
## Returns a compressed path to a file given a directory and file name.