mirror of https://github.com/pissnet/pissircd.git
300 lines
8.3 KiB
C
300 lines
8.3 KiB
C
/************************************************************************
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* IRC - Internet Relay Chat, api-extban.c
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* (C) 2003 Bram Matthys (Syzop) and the UnrealIRCd Team
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*
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* See file AUTHORS in IRC package for additional names of
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* the programmers.
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*
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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 1, or (at your option)
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* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "unrealircd.h"
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Extban MODVAR ExtBan_Table[EXTBANTABLESZ]; /* this should be fastest */
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unsigned MODVAR short ExtBan_highest = 0;
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void set_isupport_extban(void)
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{
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int i;
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char extbanstr[EXTBANTABLESZ+1], *m;
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m = extbanstr;
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for (i = 0; i <= ExtBan_highest; i++)
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{
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if (ExtBan_Table[i].flag)
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*m++ = ExtBan_Table[i].flag;
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}
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*m = 0;
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ISupportSetFmt(NULL, "EXTBAN", "~,%s", extbanstr);
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}
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Extban *findmod_by_bantype(char c)
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{
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int i;
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for (i=0; i <= ExtBan_highest; i++)
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if (ExtBan_Table[i].flag == c)
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return &ExtBan_Table[i];
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return NULL;
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}
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Extban *ExtbanAdd(Module *module, ExtbanInfo req)
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{
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int slot;
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if (findmod_by_bantype(req.flag))
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{
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if (module)
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module->errorcode = MODERR_EXISTS;
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return NULL;
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}
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/* TODO: perhaps some sanity checking on a-zA-Z0-9? */
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for (slot = 0; slot < EXTBANTABLESZ; slot++)
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if (ExtBan_Table[slot].flag == '\0')
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break;
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if (slot >= EXTBANTABLESZ - 1)
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{
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if (module)
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module->errorcode = MODERR_NOSPACE;
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return NULL;
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}
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ExtBan_Table[slot].flag = req.flag;
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ExtBan_Table[slot].is_ok = req.is_ok;
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ExtBan_Table[slot].conv_param = req.conv_param;
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ExtBan_Table[slot].is_banned = req.is_banned;
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ExtBan_Table[slot].owner = module;
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ExtBan_Table[slot].options = req.options;
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if (module)
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{
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ModuleObject *banobj = safe_alloc(sizeof(ModuleObject));
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banobj->object.extban = &ExtBan_Table[slot];
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banobj->type = MOBJ_EXTBAN;
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AddListItem(banobj, module->objects);
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module->errorcode = MODERR_NOERROR;
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}
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ExtBan_highest = slot;
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set_isupport_extban();
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return &ExtBan_Table[slot];
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}
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void ExtbanDel(Extban *eb)
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{
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/* Just zero it all away.. */
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if (eb->owner)
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{
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ModuleObject *banobj;
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for (banobj = eb->owner->objects; banobj; banobj = banobj->next)
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{
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if (banobj->type == MOBJ_EXTBAN && banobj->object.extban == eb)
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{
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DelListItem(banobj, eb->owner->objects);
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safe_free(banobj);
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break;
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}
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}
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}
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memset(eb, 0, sizeof(Extban));
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set_isupport_extban();
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/* Hmm do we want to go trough all chans and remove the bans?
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* I would say 'no' because perhaps we are just reloading,
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* and else.. well... screw them?
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*/
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}
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/* NOTE: the routines below can safely assume the ban has at
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* least the '~t:' part (t=type). -- Syzop
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*/
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/** General is_ok for n!u@h stuff that also deals with recursive extbans.
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*/
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int extban_is_ok_nuh_extban(Client *client, Channel* channel, char *para, int checkt, int what, int what2)
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{
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char *mask = (para + 3);
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Extban *p = NULL;
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int isok;
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static int extban_is_ok_recursion = 0;
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/* Mostly copied from clean_ban_mask - but note MyUser checks aren't needed here: extban->is_ok() according to cmd_mode isn't called for nonlocal. */
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if (is_extended_ban(mask))
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{
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if (extban_is_ok_recursion)
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return 0; /* Fail: more than one stacked extban */
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if ((checkt == EXBCHK_PARAM) && RESTRICT_EXTENDEDBANS && !ValidatePermissionsForPath("immune:restrict-extendedbans",client,NULL,channel,NULL))
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{
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/* Test if this specific extban has been disabled.
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* (We can be sure RESTRICT_EXTENDEDBANS is not *. Else this extended ban wouldn't be happening at all.)
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*/
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if (strchr(RESTRICT_EXTENDEDBANS, mask[1]))
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{
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sendnotice(client, "Setting/removing of extended bantypes '%s' has been disabled.", RESTRICT_EXTENDEDBANS);
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return 0; /* Fail */
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}
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}
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p = findmod_by_bantype(mask[1]);
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if (!p)
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{
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if (what == MODE_DEL)
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{
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return 1; /* Always allow killing unknowns. */
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}
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return 0; /* Don't add unknown extbans. */
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}
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/* Now we have to ask the stacked extban if it's ok. */
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if (p->is_ok)
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{
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extban_is_ok_recursion++;
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isok = p->is_ok(client, channel, mask, checkt, what, what2);
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extban_is_ok_recursion--;
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return isok;
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}
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}
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return 1; /* Either not an extban, or extban has NULL is_ok. Good to go. */
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}
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/** Some kind of general conv_param routine,
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* to ensure the parameter is nick!user@host.
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* most of the code is just copied from clean_ban_mask.
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*/
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char *extban_conv_param_nuh(char *para)
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{
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char *cp, *user, *host, *mask, *ret = NULL;
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static char retbuf[USERLEN + NICKLEN + HOSTLEN + 32];
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char tmpbuf[USERLEN + NICKLEN + HOSTLEN + 32];
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char pfix[8];
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if (strlen(para)<3)
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return NULL; /* normally impossible */
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strlcpy(tmpbuf, para, sizeof(retbuf));
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mask = tmpbuf + 3;
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strlcpy(pfix, tmpbuf, mask - tmpbuf + 1);
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if (!*mask)
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return NULL; /* empty extban */
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if ((*mask == '~') && !strchr(mask, '@'))
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return NULL; /* not a user@host ban, too confusing. */
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if ((user = strchr((cp = mask), '!')))
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*user++ = '\0';
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if ((host = strrchr(user ? user : cp, '@')))
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{
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*host++ = '\0';
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if (!user)
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ret = make_nick_user_host(NULL, trim_str(cp,USERLEN), trim_str(host,HOSTLEN));
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}
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else if (!user && strchr(cp, '.'))
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ret = make_nick_user_host(NULL, NULL, trim_str(cp,HOSTLEN));
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if (!ret)
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ret = make_nick_user_host(trim_str(cp,NICKLEN), trim_str(user,USERLEN), trim_str(host,HOSTLEN));
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ircsnprintf(retbuf, sizeof(retbuf), "%s%s", pfix, ret);
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return retbuf;
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}
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/** conv_param to deal with stacked extbans.
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*/
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char *extban_conv_param_nuh_or_extban(char *para)
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{
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#if (USERLEN + NICKLEN + HOSTLEN + 32) > 256
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#error "wtf?"
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#endif
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static char retbuf[256];
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static char printbuf[256];
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char *mask;
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char tmpbuf[USERLEN + NICKLEN + HOSTLEN + 32];
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char bantype = para[1];
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char *ret = NULL;
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Extban *p = NULL;
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static int extban_recursion = 0;
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if ((strlen(para)>3) && is_extended_ban(para+3))
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{
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/* We're dealing with a stacked extended ban.
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* Rules:
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* 1) You can only stack once, so: ~x:~y:something and not ~x:~y:~z...
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* 2) The first item must be an action modifier, such as ~q/~n/~j
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* 3) The second item may never be an action modifier, nor have the
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* EXTBOPT_NOSTACKCHILD flag set (for things like a textban).
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*/
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/* Rule #1. Yes the recursion check is also in extban_is_ok_nuh_extban,
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* but it's possible to get here without the is_ok() function ever
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* being called (think: non-local client). And no, don't delete it
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* there either. It needs to be in BOTH places. -- Syzop
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*/
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if (extban_recursion)
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return NULL;
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/* Rule #2 */
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p = findmod_by_bantype(para[1]);
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if (p && !(p->options & EXTBOPT_ACTMODIFIER))
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{
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/* Rule #2 violation */
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return NULL;
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}
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strlcpy(tmpbuf, para, sizeof(tmpbuf));
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mask = tmpbuf + 3;
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/* Already did restrict-extended bans check. */
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p = findmod_by_bantype(mask[1]);
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if (!p)
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{
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/* Handling unknown bantypes in is_ok. Assume that it's ok here. */
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return para;
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}
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if ((p->options & EXTBOPT_ACTMODIFIER) || (p->options & EXTBOPT_NOSTACKCHILD))
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{
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/* Rule #3 violation */
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return NULL;
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}
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if (p->conv_param)
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{
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extban_recursion++;
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ret = p->conv_param(mask);
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extban_recursion--;
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if (ret)
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{
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/*
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* If bans are stacked, then we have to use two buffers
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* to prevent ircsnprintf() from going into a loop.
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*/
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ircsnprintf(printbuf, sizeof(printbuf), "~%c:%s", bantype, ret); /* Make sure our extban prefix sticks. */
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memcpy(retbuf, printbuf, sizeof(retbuf));
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return retbuf;
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}
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else
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{
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return NULL; /* Fail. */
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}
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}
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/* 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 */
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/* I don't know why it's 80, but I like a limit anyway. A ban of 500 characters can never be good... -- Syzop */
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if (strlen(para) > 80)
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{
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strlcpy(retbuf, para, 128);
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return retbuf;
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}
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return para;
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}
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else
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{
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return extban_conv_param_nuh(para);
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}
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}
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