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libutil: Add requireCString, make renderUrlPathEnsureLegal error on NUL bytes better

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Same utility as in lix's change I3caf476e59dcb7899ac5a3d83dfa3fb7ceaaabf0.

Co-authored-by: eldritch horrors <pennae@lix.systems>
This commit is contained in:
Sergei Zimmerman 2025-11-18 00:29:23 +03:00
parent 72dbd43882
commit 533cced249
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3 changed files with 22 additions and 2 deletions
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6
src/libutil/include/nix/util/strings.hh
View file

@ -166,4 +166,10 @@ public:
}
};
/**
* Check that the string does not contain any NUL bytes and return c_str().
* @throws Error if str contains '\0' bytes.
*/
const char * requireCString(const std::string & str);
} // namespace nix

11
src/libutil/strings.cc
View file

@ -5,6 +5,7 @@
#include "nix/util/strings-inline.hh"
#include "nix/util/os-string.hh"
#include "nix/util/error.hh"
#include "nix/util/util.hh"
namespace nix {
@ -152,4 +153,14 @@ std::string optionalBracket(std::string_view prefix, std::string_view content, s
return result;
}
const char * requireCString(const std::string & s)
{
if (std::memchr(s.data(), '\0', s.size())) [[unlikely]] {
using namespace std::string_view_literals;
auto str = replaceStrings(s, "\0"sv, "␀"sv);
throw Error("string '%s' with null (\\0) bytes used where it's not allowed", str);
}
return s.c_str();
}
} // namespace nix

7
src/libutil/url.cc
View file

@ -327,8 +327,11 @@ Path renderUrlPathEnsureLegal(const std::vector<std::string> & urlPath)
/* This is only really valid for UNIX. Windows has more restrictions. */
if (comp.contains('/'))
throw BadURL("URL path component '%s' contains '/', which is not allowed in file names", comp);
if (comp.contains(char(0)))
throw BadURL("URL path component '%s' contains NUL byte which is not allowed", comp);
if (comp.contains(char(0))) {
using namespace std::string_view_literals;
auto str = replaceStrings(comp, "\0"sv, "␀"sv);
throw BadURL("URL path component '%s' contains NUL byte which is not allowed", str);
}
}
return concatStringsSep("/", urlPath);