#include "inspstring.h"
#include "helperfuncs.h"
#include "socketengine.h"
+#include "wildcard.h"
#include "message.h"
extern InspIRCd* ServerInstance;
extern ServerConfig* Config;
extern time_t TIME;
+/* Used when comparing CIDR masks for the modulus bits left over.
+ * A lot of ircd's seem to do this:
+ * ((-1) << (8 - (mask % 8)))
+ * But imho, it sucks in comparison to a nice neat lookup table.
+ */
+const char inverted_bits[8] = { 0x00, /* 00000000 - 0 bits - never actually used */
+ 0x80, /* 10000000 - 1 bits */
+ 0xC0, /* 11000000 - 2 bits */
+ 0xE0, /* 11100000 - 3 bits */
+ 0xF0, /* 11110000 - 4 bits */
+ 0xF8, /* 11111000 - 5 bits */
+ 0xFC, /* 11111100 - 6 bits */
+ 0xFE /* 11111110 - 7 bits */
+};
+
+/* Match raw bytes using CIDR bit matching, used by higher level MatchCIDR() */
+bool MatchCIDRBits(unsigned char* address, unsigned char* mask, unsigned int mask_bits)
+{
+ unsigned int modulus = mask_bits % 8; /* Number of whole bytes in the mask */
+ unsigned int divisor = mask_bits / 8; /* Remaining bits in the mask after whole bytes are dealt with */
+
+ /* First compare the whole bytes, if they dont match, return false */
+ if (memcmp(address, mask, divisor))
+ return false;
+
+ /* Now if there are any remainder bits, we compare them with logic AND */
+ if (modulus)
+ if ((address[divisor] & inverted_bits[modulus]) != (mask[divisor] & inverted_bits[modulus]))
+ /* If they dont match, return false */
+ return false;
+
+ /* The address matches the mask, to mask_bits bits of mask */
+ return true;
+}
+
+/* Match CIDR, but dont attempt to match() against leading *!*@ sections */
+bool MatchCIDR(const char* address, const char* cidr_mask)
+{
+ return MatchCIDR(address, cidr_mask, false);
+}
+
+/* Match CIDR strings, e.g. 127.0.0.1 to 127.0.0.0/8 or 3ffe:1:5:6::8 to 3ffe:1::0/32
+ * If you have a lot of hosts to match, youre probably better off building your mask once
+ * and then using the lower level MatchCIDRBits directly.
+ *
+ * This will also attempt to match any leading usernames or nicknames on the mask, using
+ * match(), when match_with_username is true.
+ */
+bool MatchCIDR(const char* address, const char* cidr_mask, bool match_with_username)
+{
+ unsigned char addr_raw[16];
+ unsigned char mask_raw[16];
+ unsigned int bits = 0;
+ char* mask = NULL;
+
+ /* The caller is trying to match ident@<mask>/bits.
+ * Chop off the ident@ portion, use match() on it
+ * seperately.
+ */
+ if (match_with_username)
+ {
+ /* Duplicate the strings, and try to find the position
+ * of the @ symbol in each */
+ char* address_dupe = strdup(address);
+ char* cidr_dupe = strdup(cidr_mask);
+
+ /* Use strchr not strrchr, because its going to be nearer to the left */
+ char* username_mask_pos = strrchr(cidr_dupe, '@');
+ char* username_addr_pos = strrchr(address_dupe, '@');
+
+ /* Both strings have an @ symbol in them */
+ if (username_mask_pos && username_addr_pos)
+ {
+ /* Zero out the location of the @ symbol */
+ *username_mask_pos = *username_addr_pos = 0;
+
+ /* Try and match() the strings before the @
+ * symbols, and recursively call MatchCIDR without
+ * username matching enabled to match the host part.
+ */
+ bool result = (match(address_dupe, cidr_dupe) && MatchCIDR(username_addr_pos + 1, username_mask_pos + 1, false));
+
+ /* Free the stuff we created */
+ free(address_dupe);
+ free(cidr_dupe);
+
+ /* Return a result */
+ return result;
+ }
+ else
+ {
+ /* One or both didnt have an @ in,
+ * just match as CIDR
+ */
+ free(address_dupe);
+ free(cidr_dupe);
+ mask = strdup(cidr_mask);
+ }
+ }
+ else
+ {
+ /* Make a copy of the cidr mask string,
+ * we're going to change it
+ */
+ mask = strdup(cidr_mask);
+ }
+
+ in_addr address_in4;
+ in_addr mask_in4;
+
+
+ /* Use strrchr for this, its nearer to the right */
+ char* bits_chars = strrchr(mask,'/');
+
+ if (bits_chars)
+ {
+ bits = atoi(bits_chars + 1);
+ *bits_chars = 0;
+ }
+ else
+ {
+ /* No 'number of bits' field! */
+ return false;
+ }
+
+#ifdef SUPPORT_IP6LINKS
+ in6_addr address_in6;
+ in6_addr mask_in6;
+
+ if (inet_pton(AF_INET6, address, &address_in6) > 0)
+ {
+ if (inet_pton(AF_INET6, mask, &mask_in6) > 0)
+ {
+ memcpy(&addr_raw, &address_in6.s6_addr, 16);
+ memcpy(&mask_raw, &mask_in6.s6_addr, 16);
+
+ if (bits > 128)
+ bits = 128;
+ }
+ else
+ {
+ /* The address was valid ipv6, but the mask
+ * that goes with it wasnt.
+ */
+ free(mask);
+ return false;
+ }
+ }
+ else
+#endif
+ if (inet_pton(AF_INET, address, &address_in4) > 0)
+ {
+ if (inet_pton(AF_INET, mask, &mask_in4) > 0)
+ {
+ memcpy(&addr_raw, &address_in4.s_addr, 4);
+ memcpy(&mask_raw, &mask_in4.s_addr, 4);
+
+ if (bits > 32)
+ bits = 32;
+ }
+ else
+ {
+ /* The address was valid ipv4,
+ * but the mask that went with it wasnt.
+ */
+ free(mask);
+ return false;
+ }
+ }
+ else
+ {
+ /* The address was neither ipv4 or ipv6 */
+ free(mask);
+ return false;
+ }
+
+ /* Low-level-match the bits in the raw data */
+ free(mask);
+ return MatchCIDRBits(addr_raw, mask_raw, bits);
+}
+
/** This will bind a socket to a port. It works for UDP/TCP.
* It can only bind to IP addresses, if you wish to bind to hostnames
* you should first resolve them using class 'Resolver'.
projects / user / henk / code / inspircd.git / blobdiff