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https://github.com/unrealircd/unrealircd.git
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Bram Matthys
4e17f85fe6
sent, or at least for channel events. 2) Move adding of msgid/time/account tags to modules, which is their proper place.
117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
/*
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* IRC - Internet Relay Chat, src/modules/cap/msgid.c
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* (C) 2019 Syzop & 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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ModuleHeader MOD_HEADER(msgid)
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= {
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"msgid",
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"4.2",
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"msgid CAP",
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"3.2-b8-1",
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NULL
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};
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/* Variables */
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long CAP_ACCOUNT_TAG = 0L;
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int msgid_mtag_is_ok(aClient *acptr, char *name, char *value);
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void mtag_add_or_inherit_msgid(aClient *sender, MessageTag *recv_mtags, MessageTag **mtag_list);
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MOD_INIT(msgid)
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{
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ClientCapabilityInfo cap;
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ClientCapability *c;
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MessageTagHandlerInfo mtag;
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MARK_AS_OFFICIAL_MODULE(modinfo);
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memset(&mtag, 0, sizeof(mtag));
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mtag.name = "msgid";
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mtag.is_ok = msgid_mtag_is_ok;
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mtag.flags = MTAG_HANDLER_FLAGS_NO_CAP_NEEDED;
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MessageTagHandlerAdd(modinfo->handle, &mtag);
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HookAddVoid(modinfo->handle, HOOKTYPE_NEW_MESSAGE, 0, mtag_add_or_inherit_msgid);
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return MOD_SUCCESS;
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}
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MOD_LOAD(msgid)
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{
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return MOD_SUCCESS;
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}
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MOD_UNLOAD(msgid)
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{
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return MOD_SUCCESS;
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}
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/** This function verifies if the client sending
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* 'msgid' is permitted to do so and uses a permitted
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* syntax.
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* We simply allow msgid ONLY from servers and with any syntax.
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*/
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int msgid_mtag_is_ok(aClient *acptr, char *name, char *value)
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{
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if (IsServer(acptr))
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return 1;
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return 0;
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}
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/** Generate a msgid.
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* @returns a MessageTag struct that you can use directly.
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* @notes
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* Apparently there has been some discussion on what method to use to
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* generate msgid's. I am not going to list them here. Just saying that
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* they have been considered and we chose to go for a string that contains
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* 128+ bits of randomness, which has an extremely low chance of colissions.
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* Or, to quote wikipedia on the birthday attack problem:
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* "For comparison, 10^-18 to 10^-15 is the uncorrectable bit error rate
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* of a typical hard disk. In theory, hashes or UUIDs being 128 bits,
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* should stay within that range until about 820 billion outputs"
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* For reference, 10^-15 is 0.000000000000001%
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* The main reasons for this choice are: that it is extremely simple,
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* the chance of making a mistake in an otherwise complex implementation
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* is nullified and we don't risk "leaking" any details.
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*/
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MessageTag *mtag_generate_msgid(void)
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{
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MessageTag *m = MyMallocEx(sizeof(MessageTag));
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m->name = strdup("msgid");
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m->value = MyMallocEx(MSGIDLEN+1);
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gen_random_alnum(m->value, MSGIDLEN);
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return m;
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}
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void mtag_add_or_inherit_msgid(aClient *sender, MessageTag *recv_mtags, MessageTag **mtag_list)
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{
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MessageTag *m = find_mtag(recv_mtags, "msgid");
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if (m)
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m = duplicate_mtag(m);
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else
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m = mtag_generate_msgid();
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AddListItem(m, *mtag_list);
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}
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