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e814d33900
RFC3986 allows for colons to appear within the path component of a relative URI, but iPXE will currently parse such URIs incorrectly by interpreting the text before the colon as the URI scheme. Fix by checking for valid characters when identifying the URI scheme. Deliberately deviate from the RFC3986 definition of valid characters by accepting "_" (which was incorrectly used in the iPXE-specific "ib_srp" URI scheme and so must be accepted for compatibility with existing deployments), and by omitting the code to check for characters that are not used in any URI scheme supported by iPXE. Reported-by: Ignat Korchagin <ignat@cloudflare.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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