* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * $Id$
+ */
+/** @file
+ * @brief Functions to match strings against IRC mask strings.
+ * @version $Id$
*/
#include "config.h"
* And last but not least, '\?' and '\*' in `new_mask' now become one character.
*/
+/** Compares one mask against another.
+ * One wildcard mask may be said to be a superset of another if the
+ * set of strings matched by the first is a proper superset of the set
+ * of strings matched by the second. In practical terms, this means
+ * that the second is made redundant by the first.
+ *
+ * The logic for this test is similar to that in match(), but a
+ * backslash in old_mask only matches a backslash in new_mask (and
+ * requires the next character to match exactly), and -- after
+ * contiguous runs of wildcards are logically collapsed -- a '?' in
+ * old_mask does not match a '*' in new_mask.
+ *
+ * @param[in] old_mask One wildcard mask.
+ * @param[in] new_mask Another wildcard mask.
+ * @return Zero if \a old_mask is a superset of \a new_mask, non-zero otherwise.
+ */
int mmatch(const char *old_mask, const char *new_mask)
{
const char *m = old_mask;
* Rewritten by Timothy Vogelsang (netski), net@astrolink.org
*/
+/** Check a string against a mask.
+ * This test checks using traditional IRC wildcards only: '*' means
+ * match zero or more characters of any type; '?' means match exactly
+ * one character of any type. A backslash escapes the next character
+ * so that a wildcard may be matched exactly.
+ * @param[in] mask Wildcard-containing mask.
+ * @param[in] name String to check against \a mask.
+ * @return Zero if \a mask matches \a name, non-zero if no match.
+ */
int match(const char *mask, const char *name)
{
const char *m = mask, *n = name;
* Note that this new optimized alghoritm can *only* work in place.
*/
+/** Collapse a mask string to remove redundancies.
+ * Specifically, it replaces a sequence of '*' followed by additional
+ * '*' or '?' with the same number of '?'s as the input, followed by
+ * one '*'. This minimizes useless backtracking when matching later.
+ * @param[in,out] mask Mask string to collapse.
+ * @return Pointer to the start of the string.
+ */
char *collapse(char *mask)
{
int star = 0;
***************** Nemesi's matchcomp() / matchexec() **************
*/
-/* These functions allow the use of "compiled" masks, you compile a mask
+/** @page compiledmasks Compiled Masks
+ * These functions allow the use of "compiled" masks, you compile a mask
* by means of matchcomp() that gets the plain text mask as input and writes
* its result in the memory locations addressed by the 3 parameters:
* - *cmask will contain the text of the compiled mask
* or when you expect to use mmexec() instead of mmatch() 3 times.
*/
- /*
- * matchcomp()
- *
- * Compiles a mask into a form suitable for using in matchexec().
- */
-
+/** Compile a mask for faster matching.
+ * See also @ref compiledmasks.
+ * @param[out] cmask Output buffer for compiled mask.
+ * @param[out] minlen Minimum length of matching strings.
+ * @param[out] charset Character attributes used in compiled mask.
+ * @param[out] mask Input mask.
+ * @return Length of compiled mask, not including NUL terminator.
+ */
int matchcomp(char *cmask, int *minlen, int *charset, const char *mask)
{
const char *m = mask;
}
-/*
- * matchexec()
- *
- * Executes a match with a mask previosuly compiled with matchcomp()
- * Note 1: If the mask isn't correctly produced by matchcomp() I will core
- * Note 2: 'min' MUST be the value returned by matchcomp on that mask,
- * or.... I will core even faster :-)
- * Note 3: This piece of code is not intended to be nice but efficient.
+/** Compare a string to a compiled mask.
+ * If \a cmask is not from matchcomp(), or if \a minlen is not the value
+ * passed out of matchcomp(), this may core.
+ * See also @ref compiledmasks.
+ * @param[in] string String to test.
+ * @param[in] cmask Compiled mask string.
+ * @param[in] minlen Minimum length of strings that match \a cmask.
+ * @return Zero if the string matches, non-zero otherwise.
*/
-
int matchexec(const char *string, const char *cmask, int minlen)
{
const char *s = string - 1;
* It returns the number of chars actually written to *mask;
*/
+/** Decompile a compiled mask into printable form.
+ * See also @ref compiledmasks.
+ * @param[out] mask Output mask buffer.
+ * @param[in] cmask Compiled mask.
+ * @return Number of characters written to \a mask.
+ */
int matchdecomp(char *mask, const char *cmask)
{
char *rtb = mask;
* written by Run (Carlo Wood), this function is written by
* Nemesi (Andrea Cocito)
*/
-
+/** Tests for a superset relationship between compiled masks. This
+ * function does for compiled masks what mmatch() is does for normal
+ * masks.
+ * See also @ref compiledmasks.
+ * @param[in] wcm Compiled mask believed to be wider.
+ * @param[in] wminlen Minimum match length for \a wcm.
+ * @param[in] rcm Compiled mask believed to be restricted.
+ * @param[in] rminlen Minimum match length for \a rcm.
+ * @return Zero if \a wcm is a superset of \a rcm, non-zero if not.
+ */
int mmexec(const char *wcm, int wminlen, const char *rcm, int rminlen)
{
const char *w, *r, *br, *bw, *rx, *rz;
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
-#include <arpa/inet.h>
+/** Parse an input string as an IPv4 address.
+ * @param[in] in Text form of address.
+ * @param[out] out IPv4 address in network representation.
+ * @return Number of address bits specified by \a in.
+ */
static int ipmask_parse_ipv4(const char *in, struct in_addr *out)
{
int class;
- char ipname[16];
int ad[4] = { 0 };
int bits = 0;
class = sscanf(in, "%d.%d.%d.%d/%d", &ad[0], &ad[1], &ad[2], &ad[3], &bits);
if (class != 5)
bits = class * 8;
- ircd_snprintf(0, ipname, sizeof(ipname), "%d.%d.%d.%d", ad[0], ad[1], ad[2], ad[3]);
- out->s_addr = inet_addr(ipname);
+ out->s_addr = ntohl((ad[0] << 24) | (ad[1] << 16) | (ad[2] << 8) | ad[3]);
return bits;
}
+/** Test whether a string looks like it matches only IPv4 addresses.
+ * @param[in] mask Hostname matching mask.
+ * @return Non-zero if \a mask can only match IPv4 addresses, zero otherwise.
+ */
int check_if_ipmask(const char *mask)
{
int has_digit = 0;
return has_digit;
}
+/** Try to parse an IPv4 or IPv6 address mask.
+ * @param[in] in Address matching mask.
+ * @param[out] mask Fixed bits of address mask.
+ * @param[out] bits_ptr If non-NULL, receives number of bits specified in address mask.
+ * @return Non-zero on successful parse; zero on error.
+ */
int ipmask_parse(const char *in, struct irc_in_addr *mask, unsigned char *bits_ptr)
{
struct in_addr ipv4;
if (check_if_ipmask(in)) {
bits = ipmask_parse_ipv4(in, &ipv4);
mask->in6_16[0] = mask->in6_16[1] = mask->in6_16[2] = 0;
- mask->in6_16[3] = mask->in6_16[4] = mask->in6_16[5] = 0;
+ mask->in6_16[3] = mask->in6_16[4] = 0;
+ mask->in6_16[5] = 0xffff;
memcpy(&mask->in6_16[6], &ipv4.s_addr, sizeof(ipv4.s_addr));
bits += 96;
+ } else if (in[0] == '*' && in[1] == '\0') {
+ /* accept as a 0-bit mask */
} else {
if (!(p = strchr(in, '/')))
bits = 128;
return 1;
}
+/** Test whether an address matches the most significant bits of a mask.
+ * @param[in] addr Address to test.
+ * @param[in] mask Address to test against.
+ * @param[in] bits Number of bits to test.
+ * @return 0 on mismatch, 1 if bits < 128 and all bits match; -1 if
+ * bits == 128 and all bits match.
+ */
int ipmask_check(const struct irc_in_addr *addr, const struct irc_in_addr *mask, unsigned char bits)
{
int k;
for (k = 0; k < 8; k++) {
if (bits < 16)
- return (addr->in6_16[k] & ((unsigned char) (0xffff << (16-bits)))) == mask->in6_16[k];
+ return (addr->in6_16[k] & htons(0xffff << (16-bits))) == mask->in6_16[k];
if (addr->in6_16[k] != mask->in6_16[k])
return 0;
if (!(bits -= 16))
projects / ircu2.10.12-pk.git / blobdiff