mirror of
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74 lines
2.0 KiB
C++
74 lines
2.0 KiB
C++
/*
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Copyright (c) 2016, Antonio SJ Musumeci <trapexit@spawn.link>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#pragma once
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#include <sys/types.h>
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#include <unistd.h>
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#include <array>
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#define MAXGIDS 32
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#define MAXRECS 256
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// GIDCache is a global, per thread cache of uid to gid + supplemental
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// groups mapping for use when threads change credentials. This is
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// needed due to the high cost of querying such information. The cache
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// instance should always be thread local and live the lifetime of the
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// app. The constructor will register the instance so they can each be
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// told to invalidate the cache on demand. A second instance on the
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// same thread will cause an assert to be triggered.
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struct GIDRecord
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{
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uid_t uid;
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int size;
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gid_t gids[MAXGIDS];
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bool
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operator<(const struct GIDRecord &b) const;
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};
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struct GIDCache
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{
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public:
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GIDCache();
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public:
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bool invalidate;
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size_t size;
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std::array<GIDRecord,MAXRECS> recs;
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private:
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GIDRecord *begin(void);
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GIDRecord *end(void);
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GIDRecord *allocrec(void);
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GIDRecord *lower_bound(GIDRecord *begin,
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GIDRecord *end,
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const uid_t uid);
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GIDRecord *cache(const uid_t uid,
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const gid_t gid);
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public:
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int
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initgroups(const uid_t uid,
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const gid_t gid);
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public:
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static void invalidate_all_caches();
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};
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