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17 lines
540 B
17 lines
540 B
#!/bin/sh |
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# POSIX compliant regular expressions |
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# Matches any string that contains a null byte or begins or ends with a / |
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REGEX1='(^/|/$|\\0)' |
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# Matches any string longer than 255 characters (for a single filename) |
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REGEX2='^.{256,}$' |
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# Matches any string longer than 4096 characters (for a full path) |
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REGEX3='^.{4097,}$' |
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if echo "$1" | grep -Eq "$REGEX1" || echo "$1" | grep -Eq "$REGEX2" || echo "$1" | grep -Eq "$REGEX3"; then |
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# If any regex matches, this is an invalid path |
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exit 1 |
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else |
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# Otherwise, it's valid |
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exit 0 |
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fi |