mirror of
https://github.com/unrealircd/unrealircd.git
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codemastr
360 lines
8.9 KiB
C
360 lines
8.9 KiB
C
/***********************************************************************
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* Unreal Internet Relay Chat Daemon
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*
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* All parts of this program are Copyright(C) 2001(or later).
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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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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* $Id$
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "struct.h"
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#include "h.h"
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/* The following functions have been taken from Hybrid7-beta8 simply because
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* I didn't feel like writing my own when they had ones that work just fine :)
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*/
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#ifdef INET6
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static int parse_v6_netmask(const char *, struct IN_ADDR *, int *);
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#endif
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static int parse_v4_netmask(const char *, struct IN_ADDR *, int *);
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#define DigitParse(ch) if (ch >= '0' && ch <= '9') \
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ch = ch - '0'; \
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else if (ch >= 'A' && ch <= 'F') \
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ch = ch - 'A' + '0'; \
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else if (ch >= 'a' && ch <= 'f') \
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ch = ch - 'a' + '0';
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/* The mask parser/type determination code... */
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/* int parse_v6_netmask(const char *, struct IN_ADDR*, int *);
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* Input: An possible IPV6 address as a string.
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* Output: An integer describing whether it is an IPV6 or hostmask,
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* an address(if it is IPV6), a bitlength(if it is IPV6).
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* Side effects: None
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* Comments: Called from parse_netmask
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*/
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#ifdef INET6
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static int
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parse_v6_netmask(const char *text, struct IN_ADDR *addr, int *b)
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{
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const char *p;
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char c;
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int d[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }, dp = 0, nyble = 4, finsert =
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-1, bits = 0, deficit = 0;
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short dc[8];
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for (p = text; (c = *p); p++)
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if (isxdigit(c))
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{
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if (nyble == 0)
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return HM_HOST;
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DigitParse(c);
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d[dp] |= c << (4 * --nyble);
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}
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else if (c == ':')
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{
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if (p > text && *(p - 1) == ':')
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{
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if (finsert >= 0)
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return HM_HOST;
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finsert = dp;
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}
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else
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{
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/* If there were less than 4 hex digits, e.g. :ABC: shift right
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* so we don't interpret it as ABC0 -A1kmm */
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d[dp] = d[dp] >> 4 * nyble;
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nyble = 4;
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if (++dp >= 8)
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return HM_HOST;
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}
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}
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else if (c == '*')
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{
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/* * must be last, and * is ambiguous if there is a ::... -A1kmm */
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if (finsert >= 0 || *(p + 1) || dp == 0 || *(p - 1) != ':')
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return HM_HOST;
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bits = dp * 16;
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}
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else if (c == '/')
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{
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char *after;
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d[dp] = d[dp] >> 4 * nyble;
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dp++;
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if (p > text && *(p - 1) == ':')
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return HM_HOST;
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bits = strtoul(p + 1, &after, 10);
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if (bits == 0 || *after)
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return HM_HOST;
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if (bits > dp * 4 && !(finsert >= 0 && bits <= 128))
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return HM_HOST;
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break;
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}
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else
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return HM_HOST;
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d[dp] = d[dp] >> 4 * nyble;
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if (c == 0)
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dp++;
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if (finsert < 0 && bits == 0)
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bits = dp * 16;
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else if (bits == 0)
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bits = 128;
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/* How many words are missing? -A1kmm */
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deficit = bits / 16 + ((bits % 16) ? 1 : 0) - dp;
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/* Now fill in the gaps(from ::) in the copied table... -A1kmm */
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for (dp = 0, nyble = 0; dp < 8; dp++)
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{
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if (nyble == finsert && deficit)
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{
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dc[dp] = 0;
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deficit--;
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}
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else
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dc[dp] = d[nyble++];
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}
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/* Set unused bits to 0... -A1kmm */
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if (bits < 128 && (bits % 16 != 0))
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dc[bits / 16] &= ~((1 << (15 - bits % 16)) - 1);
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for (dp = bits / 16 + (bits % 16 ? 1 : 0); dp < 8; dp++)
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dc[dp] = 0;
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/* And assign... -A1kmm */
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if (addr)
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for (dp = 0; dp < 8; dp++)
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/* The cast is a kludge to make netbsd work. */
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((unsigned short *)&addr->s6_addr)[dp] = htons(dc[dp]);
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if (b)
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*b = bits;
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return HM_IPV6;
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}
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#endif
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/* int parse_v4_netmask(const char *, struct IN_ADDR *, int *);
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* Input: An possible IPV4 address as a string.
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* Output: An integer describing whether it is an IPV4 or hostmask,
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* an address(if it is IPV4), a bitlength(if it is IPV4).
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* Side effects: None
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* Comments: Called from parse_netmask
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*/
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static int
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parse_v4_netmask(const char *text, struct IN_ADDR *addr, int *b)
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{
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#ifndef INET6
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const char *p;
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const char *digits[4];
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unsigned char addb[4];
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int n = 0, bits = 0;
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char c;
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digits[n++] = text;
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for (p = text; (c = *p); p++)
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if (c >= '0' && c <= '9') /* empty */
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;
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else if (c == '.')
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{
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if (n >= 4)
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return HM_HOST;
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digits[n++] = p + 1;
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}
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else if (c == '*')
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{
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if (*(p + 1) || n == 0 || *(p - 1) != '.')
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return HM_HOST;
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bits = (n - 1) * 8;
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break;
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}
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else if (c == '/')
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{
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char *after;
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bits = strtoul(p + 1, &after, 10);
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if (!bits || *after)
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return HM_HOST;
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if (bits > n * 8)
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return HM_HOST;
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break;
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}
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else
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return HM_HOST;
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if (n < 4 && bits == 0)
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bits = n * 8;
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if (bits)
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while (n < 4)
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digits[n++] = "0";
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for (n = 0; n < 4; n++)
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addb[n] = strtoul(digits[n], NULL, 10);
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if (bits == 0)
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bits = 32;
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/* Set unused bits to 0... -A1kmm */
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if (bits < 32 && bits % 8)
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addb[bits / 8] &= ~((1 << (8 - bits % 8)) - 1);
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for (n = bits / 8 + (bits % 8 ? 1 : 0); n < 8; n++)
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addb[n] = 0;
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if (addr)
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addr->S_ADDR =
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htonl(addb[0] << 24 | addb[1] << 16 | addb[2] << 8 | addb[3]);
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if (b)
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*b = bits;
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return HM_IPV4;
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#else
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u_char *cp;
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const char *p;
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const char *digits[4];
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unsigned char addb[4];
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int n = 0, bits = 0;
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char c;
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digits[n++] = text;
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for (p = text; (c = *p); p++)
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if (c >= '0' && c <= '9') /* empty */
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;
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else if (c == '.')
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{
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if (n >= 4)
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return HM_HOST;
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digits[n++] = p + 1;
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}
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else if (c == '*')
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{
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if (*(p + 1) || n == 0 || *(p - 1) != '.')
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return HM_HOST;
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bits = (n - 1) * 8;
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break;
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}
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else if (c == '/')
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{
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char *after;
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bits = strtoul(p + 1, &after, 10);
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if (!bits || *after)
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return HM_HOST;
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if (bits > n * 8)
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return HM_HOST;
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break;
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}
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else
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return HM_HOST;
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if (n < 4 && bits == 0)
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bits = n * 8;
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if (bits)
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while (n < 4)
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digits[n++] = "0";
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for (n = 0; n < 4; n++)
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addb[n] = strtoul(digits[n], NULL, 10);
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if (bits == 0)
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bits = 32;
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/* Set unused bits to 0... -A1kmm */
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if (bits < 32 && bits % 8)
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addb[bits / 8] &= ~((1 << (8 - bits % 8)) - 1);
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for (n = bits / 8 + (bits % 8 ? 1 : 0); n < 8; n++)
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addb[n] = 0;
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if (addr)
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{
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cp = (u_char *)addr->s6_addr;
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for (n = 0; n <= 9; n++)
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cp[n] = 0;
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cp[10] = 0xff;
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cp[11] = 0xff;
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cp[12] = addb[0];
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cp[13] = addb[1];
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cp[14] = addb[2];
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cp[15] = addb[3];
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}
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if (b)
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*b = bits;
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return HM_IPV4;
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#endif
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}
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/* int parse_netmask(const char *, struct IN_ADDR *, int *);
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* Input: A hostmask, or an IPV4/6 address.
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* Output: An integer describing whether it is an IPV4, IPV6 address or a
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* hostmask, an address(if it is an IP mask),
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* a bitlength(if it is IP mask).
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* Side effects: None
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*/
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int
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parse_netmask(const char *text, struct IN_ADDR *addr, int *b)
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{
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#ifdef INET6
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if (strchr(text, ':'))
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return parse_v6_netmask(text, addr, b);
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#endif
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if (strchr(text, '.'))
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return parse_v4_netmask(text, addr, b);
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return HM_HOST;
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}
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/* The address matching stuff... */
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/* int match_ipv6(struct IN_ADDR *, struct IN_ADDR *, int)
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* Input: An IP address, an IP mask, the number of bits in the mask.
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* Output: if match, 0 else 1
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* Side effects: None
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*/
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#ifdef INET6
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int
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match_ipv6(struct IN_ADDR *addr, struct IN_ADDR *mask, int bits)
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{
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int i, m, n = bits / 8;
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for (i = 0; i < n; i++)
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if (addr->S_ADDR[i] != mask->S_ADDR[i])
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return 1;
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if ((m = bits % 8) == 0)
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return 0;
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if ((addr->S_ADDR[n] & ~((1 << (8 - m)) - 1)) ==
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mask->S_ADDR[n])
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return 0;
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return 1;
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}
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#endif
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/* int match_ipv4(struct IN_ADDR *, struct IN_ADDR *, int)
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* Input: An IP address, an IP mask, the number of bits in the mask.
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* Output: if match, 0 else 1
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* Side Effects: None
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*/
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int
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match_ipv4(struct IN_ADDR *addr, struct IN_ADDR *mask, int bits)
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{
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#ifndef INET6
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if ((ntohl(addr->S_ADDR) & ~((1 << (32 - bits)) - 1)) !=
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ntohl(mask->S_ADDR))
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return 1;
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return 0;
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#else
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struct in_addr ipv4addr, ipv4mask;
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ipv4addr.s_addr = inet_addr((char *)Inet_ia2p(addr));
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ipv4mask.s_addr = inet_addr((char *)Inet_ia2p(mask));
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if ((ntohl(ipv4addr.s_addr) & ~((1 << (32 - bits)) - 1)) !=
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ntohl(ipv4mask.s_addr))
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return 1;
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return 0;
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#endif
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}
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