コード例 #1
0
/* clean_ban_mask:	makes a proper banmask
 * RETURNS: pointer to correct banmask or NULL in case of error
 * NOTES:
 * - A pointer is returned to a static buffer, which is overwritten
 *   on next clean_ban_mask or make_nick_user_host call.
 * - mask is fragged in some cases, this could be bad.
 */
char *clean_ban_mask(char *mask, int what, aClient *cptr)
{
	char *cp;
	char *user;
	char *host;
	Extban *p;

	cp = index(mask, ' ');
	if (cp)
		*cp = '\0';

	/* Strip any ':' at beginning coz that desynchs clients/banlists */
	for (; (*mask && (*mask == ':')); mask++);
	if (!*mask)
		return NULL;

	/* Extended ban? */
	if ((*mask == '~') && mask[1] && (mask[2] == ':'))
	{
		if (RESTRICT_EXTENDEDBANS && MyClient(cptr) && !IsAnOper(cptr))
		{
			if (!strcmp(RESTRICT_EXTENDEDBANS, "*"))
			{
				sendnotice(cptr, "Setting/removing of extended bans has been disabled");
				return NULL;
			}
			if (strchr(RESTRICT_EXTENDEDBANS, mask[1]))
			{
				sendnotice(cptr, "Setting/removing of extended bantypes '%s' has been disabled",
					RESTRICT_EXTENDEDBANS);
				return NULL;
			}
		}
		p = findmod_by_bantype(mask[1]);
		if (!p)
		{
			/* extended bantype not supported, what to do?
			 * Here are the rules:
			 * - if from a remote client/server: allow it (easy upgrading,
			 *   no desynch)
			 * - if from a local client trying to REMOVE the extban,
			 *   allow it too (so you don't get "unremovable" extbans).
			 */
			if (!MyClient(cptr) || (what == MODE_DEL))
				return mask; /* allow it */
			return NULL; /* reject */
		}
		if (p->conv_param)
			return p->conv_param(mask);
		/* else, do some basic sanity checks and cut it off at 80 bytes */
		if ((cp[1] != ':') || (cp[2] == '\0'))
		    return NULL; /* require a ":<char>" after extban type */
		if (strlen(mask) > 80)
			mask[80] = '\0';
		return mask;
	}

	if ((*mask == '~') && !strchr(mask, '@'))
		return NULL; /* not an extended ban and not a ~user@host ban either. */

	if ((user = index((cp = mask), '!')))
		*user++ = '\0';
	if ((host = rindex(user ? user : cp, '@')))
	{
		*host++ = '\0';

		if (!user)
			return make_nick_user_host(NULL, trim_str(cp,USERLEN), 
				trim_str(host,HOSTLEN));
	}
	else if (!user && index(cp, '.'))
		return make_nick_user_host(NULL, NULL, trim_str(cp,HOSTLEN));
	return make_nick_user_host(trim_str(cp,NICKLEN), trim_str(user,USERLEN), 
		trim_str(host,HOSTLEN));
}
コード例 #2
0
ファイル: extbans.c プロジェクト: Adam-/unrealircd
/** conv_param to deal with stacked extbans.
 */
char* extban_conv_param_nuh_or_extban(char* para)
{
#if (USERLEN + NICKLEN + HOSTLEN + 32) > 256
 #error "wtf?"
#endif
	static char retbuf[256];
	static char printbuf[256];
	char *mask;
	char tmpbuf[USERLEN + NICKLEN + HOSTLEN + 32];
	char bantype = para[1];
	char *ret = NULL;
	Extban *p = NULL;
	static int extban_recursion = 0;

	if (para[3] == '~' && para[4] && para[5] == ':')
	{
		/* We're dealing with a stacked extended ban.
		 * Rules:
		 * 1) You can only stack once, so: ~x:~y:something and not ~x:~y:~z...
		 * 2) The first item must be an action modifier, such as ~q/~n/~j
		 * 3) The second item may never be an action modifier, nor have the
		 *    EXTBOPT_NOSTACKCHILD flag set (for things like a textban).
		 */
		 
		/* Rule #1. Yes the recursion check is also in extban_is_ok_nuh_extban,
		 * but it's possible to get here without the is_ok() function ever
		 * being called (think: non-local client). And no, don't delete it
		 * there either. It needs to be in BOTH places. -- Syzop
		 */
		if (extban_recursion)
			return NULL;

		/* Rule #2 */
		p = findmod_by_bantype(para[1]);
		if (p && !(p->options & EXTBOPT_ACTMODIFIER))
		{
			/* Rule #2 violation */
			return NULL;
		}
		
		strncpyzt(tmpbuf, para, sizeof(tmpbuf));
		mask = tmpbuf + 3;
		/* Already did restrict-extended bans check. */
		p = findmod_by_bantype(mask[1]);
		if (!p)
		{
			/* Handling unknown bantypes in is_ok. Assume that it's ok here. */
			return para;
		}
		if ((p->options & EXTBOPT_ACTMODIFIER) || (p->options & EXTBOPT_NOSTACKCHILD))
		{
			/* Rule #3 violation */
			return NULL;
		}
		
		if (p->conv_param)
		{
			extban_recursion++;
			ret = p->conv_param(mask);
			extban_recursion--;
			if (ret)
			{
				/*
				 * If bans are stacked, then we have to use two buffers
				 * to prevent ircsprintf() from going into a loop.
				 */
				ircsprintf(printbuf, "~%c:%s", bantype, ret); /* Make sure our extban prefix sticks. */
				memcpy(retbuf, printbuf, sizeof(retbuf));
				return retbuf;
			}
			else
			{
				return NULL; /* Fail. */
			}
		}
		/* I honestly don't know what the deal is with the 80 char cap in clean_ban_mask is about. So I'm leaving it out here. -- aquanight */
		/* I don't know why it's 80, but I like a limit anyway. A ban of 500 characters can never be good... -- Syzop */
		if (strlen(para) > 80)
		{
			strlcpy(retbuf, para, 128);
			return retbuf;
		}
		return para;
	}
	else
	{
		return extban_conv_param_nuh(para);
	}
}