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/* |
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* Copyright (c) 2023 joshua stein <jcs@jcs.org> |
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* |
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* Permission to use, copy, modify, and 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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* |
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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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|
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/* ipdb database format: |
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|
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[uint32_t][0] file offset of network "0.0.0.0/8" |
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[uint32_t][1] file offset of network "1.0.0.0/8" |
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... |
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[uint32_t][255] file offset of network "255.0.0.0/8" |
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[uint8_t] location 0 length |
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[char][length] location 0 |
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[uint8_t] location 1 length |
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[char][length] location 1 |
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... |
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[uint32_t] network 0 start (1.0.0.0) |
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[uint32_t] network 0 end (1.0.0.255) |
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[uint32_t] network 0 location pointer |
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[uint32_t] network 1 start (1.0.1.0) |
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[uint32_t] network 1 end (1.0.1.255) |
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[uint32_t] network 1 location pointer |
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... |
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|
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For an ip "5.6.7.8", look up table[5] and seek there, then do a binary |
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search between that location and that of table[6] (or end of file if |
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255). |
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|
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If the table location points to 0, that network is not in the file. |
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*/ |
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|
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#ifndef __IPDB_H__ |
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#define __IPDB_H__ |
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|
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#include "util.h" |
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|
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struct ipdb_file { |
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short fh; |
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size_t fsize; |
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u_int32_t starts[256]; |
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}; |
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|
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struct ipdb_file * ipdb_open(char *filename); |
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void ipdb_close(struct ipdb_file **ipdbp); |
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char * ipdb_lookup(struct ipdb_file *ipdb, u_int32_t ip); |
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|
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#endif |