68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
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/*
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* uhub - A tiny ADC p2p connection hub
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* Copyright (C) 2007-2009, Jan Vidar Krey
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef HAVE_UHUB_SID_H
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#define HAVE_UHUB_SID_H
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#define SID_MAX 1048576
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extern const char* BASE32_ALPHABET;
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extern char* sid_to_string(sid_t sid_);
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extern sid_t string_to_sid(const char* sid);
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struct sid_map
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{
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struct user* ptr;
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struct sid_map* next;
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};
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/**
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* Session IDs are heavily reused, since they are a fairly scarce
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* resource. Only one (2^10)-1 exist, since it is a four byte base32-encoded
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* value and 'AAAA' (0) is reserved for the hub.
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*
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* Initialize with sid_initialize(), which sets min and max to one, and count to 0.
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*
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* When allocating a session ID:
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* - If 'count' is less than the pool size (max-min), then allocate within the pool
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* - Increase the pool size (see below)
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* - If unable to do that, hub is really full - don't let anyone in!
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*
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* When freeing a session ID:
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* - If the session ID being freed is 'max', then decrease the pool size by one.
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*
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*/
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struct sid_pool
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{
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sid_t min;
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sid_t max;
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sid_t count;
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struct sid_map* map;
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};
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extern void sid_initialize(struct sid_pool*);
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extern sid_t sid_alloc(struct sid_pool*, struct user*);
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extern void sid_free(struct sid_pool*, sid_t);
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#endif /* HAVE_UHUB_SID_H */
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