mirror of
https://github.com/matrix-construct/construct
synced 2024-11-29 10:12:39 +01:00
519 lines
13 KiB
C++
519 lines
13 KiB
C++
/*
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* charybdis: an advanced ircd.
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* parse.c: The message parser.
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*
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* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
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* Copyright (C) 1996-2002 Hybrid Development Team
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* Copyright (C) 2002-2005 ircd-ratbox development team
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* Copyright (C) 2007-2016 William Pitcock
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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 2 of the License, or
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* (at your option) 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*/
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/*
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make_index<Message>(),
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{
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[](mod &mod, const std::string &name)
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{
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auto &tab(get<Message>(mod, name));
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mod_add_cmd(&tab);
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},
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[](mod &mod, const std::string &name)
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{
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auto &tab(get<Message>(mod, name));
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mod_del_cmd(&tab);
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}
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}
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*/
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namespace ircd {
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std::map<std::string, std::shared_ptr<alias_entry>, case_insensitive_less> alias_dict;
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std::map<std::string, Message *, case_insensitive_less> cmd_dict;
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static void cancel_clients(client::client *, client::client *);
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static void remove_unknown(client::client *, const char *, char *);
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static void do_numeric(int, client::client *, client::client *, int, const char **);
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static int handle_command(struct Message *, struct MsgBuf *, client::client *, client::client *);
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static char buffer[1024];
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/* parse()
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*
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* given a raw buffer, parses it and generates parv and parc
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*/
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void
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parse(client::client *client_p, char *pbuffer, char *bufend)
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{
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client::client *from = client_p;
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char *end;
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int res;
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int numeric = 0;
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struct Message *mptr;
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struct MsgBuf msgbuf;
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s_assert(my_connect(*client_p));
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s_assert(client_p->localClient->F != NULL);
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if(is_any_dead(*client_p))
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return;
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end = bufend - 1;
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/* XXX this should be done before parse() is called */
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if(*end == '\n')
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*end-- = '\0';
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if(*end == '\r')
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*end = '\0';
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res = msgbuf_parse(&msgbuf, pbuffer);
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if (res)
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{
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ServerStats.is_empt++;
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return;
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}
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if (msgbuf.origin != NULL && is_server(*client_p))
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{
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from = find_client(msgbuf.origin);
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/* didnt find any matching client, issue a kill */
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if(from == NULL)
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{
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ServerStats.is_unpf++;
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remove_unknown(client_p, msgbuf.origin, pbuffer);
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return;
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}
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/* fake direction, hmm. */
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if(from->from != client_p)
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{
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ServerStats.is_wrdi++;
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cancel_clients(client_p, from);
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return;
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}
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}
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if(rfc1459::is_digit(*msgbuf.cmd) && rfc1459::is_digit(*(msgbuf.cmd + 1)) && rfc1459::is_digit(*(msgbuf.cmd + 2)))
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{
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mptr = NULL;
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numeric = atoi(msgbuf.cmd);
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ServerStats.is_num++;
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}
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else
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{
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mptr = cmd_dict[msgbuf.cmd];
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/* no command or its encap only, error */
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if(!mptr || !mptr->cmd)
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{
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if(is_person(*from))
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{
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sendto_one(from, form_str(ERR_UNKNOWNCOMMAND),
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me.name, from->name, msgbuf.cmd);
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}
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ServerStats.is_unco++;
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return;
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}
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mptr->bytes += msgbuf.parselen;
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}
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if(mptr == NULL)
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{
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do_numeric(numeric, client_p, from, msgbuf.n_para, msgbuf.para);
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return;
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}
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if(handle_command(mptr, &msgbuf, client_p, from) < -1)
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{
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char *p;
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for (p = pbuffer; p <= end; p += 8)
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{
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/* HACK HACK */
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/* Its expected this nasty code can be removed
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* or rewritten later if still needed.
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*/
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if((p + 8) > end)
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{
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for (; p <= end; p++)
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{
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ilog(L_MAIN, "%02x |%c", p[0], p[0]);
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}
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}
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else
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ilog(L_MAIN,
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"%02x %02x %02x %02x %02x %02x %02x %02x |%c%c%c%c%c%c%c%c",
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p[0], p[1], p[2], p[3], p[4], p[5],
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p[6], p[7], p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
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}
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}
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}
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/*
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* handle_command
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*
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* inputs - pointer to message block
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* - pointer to message buffer
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* - pointer to client
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* - pointer to client message is from
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* output - -1 if error from server
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* side effects -
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*/
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static int
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handle_command(struct Message *mptr, struct MsgBuf *msgbuf_p, client::client *client_p, client::client *from)
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{
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struct MessageEntry ehandler;
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MessageHandler handler = 0;
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char squitreason[80];
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if(is_any_dead(*client_p))
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return -1;
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if(is_server(*client_p))
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mptr->rcount++;
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mptr->count++;
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ehandler = mptr->handlers[from->handler];
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handler = ehandler.handler;
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/* check right amount of params is passed... --is */
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if(msgbuf_p->n_para < ehandler.min_para ||
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(ehandler.min_para && EmptyString(msgbuf_p->para[ehandler.min_para - 1])))
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{
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if(!is_server(*client_p))
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{
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sendto_one(client_p, form_str(ERR_NEEDMOREPARAMS),
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me.name,
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EmptyString(client_p->name) ? "*" : client_p->name,
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mptr->cmd);
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if(my(*client_p))
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return (1);
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else
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return (-1);
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}
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sendto_realops_snomask(sno::GENERAL, L_ALL,
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"Dropping server %s due to (invalid) command '%s'"
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" with only %zu arguments (expecting %zu).",
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client_p->name, mptr->cmd, msgbuf_p->n_para, ehandler.min_para);
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ilog(L_SERVER,
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"Insufficient parameters (%zu < %zu) for command '%s' from %s.",
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msgbuf_p->n_para, ehandler.min_para, mptr->cmd, client_p->name);
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snprintf(squitreason, sizeof squitreason,
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"Insufficient parameters (%zu < %zu) for command '%s'",
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msgbuf_p->n_para, ehandler.min_para, mptr->cmd);
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exit_client(client_p, client_p, client_p, squitreason);
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return (-1);
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}
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handler(msgbuf_p, *client_p, *from, msgbuf_p->n_para, msgbuf_p->para);
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return (1);
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}
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void
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handle_encap(struct MsgBuf *msgbuf_p, client::client *client_p, client::client *source_p,
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const char *command, int parc, const char *parv[])
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{
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struct Message *mptr;
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struct MessageEntry ehandler;
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MessageHandler handler = 0;
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mptr = cmd_dict[command];
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if(mptr == NULL || mptr->cmd == NULL)
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return;
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ehandler = mptr->handlers[ENCAP_HANDLER];
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handler = ehandler.handler;
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if((size_t)parc < ehandler.min_para ||
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(ehandler.min_para && EmptyString(parv[ehandler.min_para - 1])))
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return;
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handler(msgbuf_p, *client_p, *source_p, parc, parv);
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}
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/* mod_add_cmd
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*
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* inputs - command name
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* - pointer to struct Message
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* output - none
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* side effects - load this one command name
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* msg->count msg->bytes is modified in place, in
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* modules address space. Might not want to do that...
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*/
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void
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mod_add_cmd(struct Message *msg)
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{
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s_assert(msg != NULL);
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if(msg == NULL)
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return;
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if (cmd_dict[msg->cmd] != NULL)
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{
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s_assert(0);
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return;
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}
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msg->count = 0;
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msg->rcount = 0;
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msg->bytes = 0;
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cmd_dict[msg->cmd] = msg;
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}
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/* mod_del_cmd
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*
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* inputs - command name
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* output - none
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* side effects - unload this one command name
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*/
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void
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mod_del_cmd(struct Message *msg)
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{
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s_assert(msg != NULL);
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if(msg == NULL)
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return;
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cmd_dict.erase(msg->cmd);
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}
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/* cancel_clients()
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*
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* inputs - client who sent us the message, client with fake
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* direction
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* outputs - a given warning about the fake direction
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* side effects -
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*/
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static void
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cancel_clients(client::client *client_p, client::client *source_p)
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{
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/* ok, fake prefix happens naturally during a burst on a nick
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* collision with TS5, we cant kill them because one client has to
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* survive, so we just send an error.
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*/
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if(is_server(*source_p) || is_me(*source_p))
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{
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sendto_realops_snomask(sno::DEBUG, L_ALL,
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"Message for %s[%s] from %s",
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source_p->name, source_p->from->name,
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client_p->name);
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}
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else
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{
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sendto_realops_snomask(sno::DEBUG, L_ALL,
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"Message for %s[%s@%s!%s] from %s (TS, ignored)",
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source_p->name,
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source_p->username,
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source_p->host,
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source_p->from->name,
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client_p->name);
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}
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}
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/* remove_unknown()
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*
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* inputs - client who gave us message, supposed sender, buffer
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* output -
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* side effects - kills issued for clients, squits for servers
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*/
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static void
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remove_unknown(client::client *client_p, const char *lsender, char *lbuffer)
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{
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int slen = strlen(lsender);
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char sid[4];
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client::client *server;
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/* meepfoo is a nickname (ignore)
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* #XXXXXXXX is a UID (KILL)
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* #XX is a SID (SQUIT)
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* meep.foo is a server (SQUIT)
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*/
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if((rfc1459::is_digit(lsender[0]) && slen == 3) ||
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(strchr(lsender, '.') != NULL))
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{
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sendto_realops_snomask(sno::DEBUG, L_ALL,
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"Unknown prefix (%s) from %s, Squitting %s",
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lbuffer, client_p->name, lsender);
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sendto_one(client_p,
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":%s SQUIT %s :(Unknown prefix (%s) from %s)",
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get_id(&me, client_p), lsender,
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lbuffer, client_p->name);
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}
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else if(!rfc1459::is_digit(lsender[0]))
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;
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else if(slen != 9)
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sendto_realops_snomask(sno::DEBUG, L_ALL,
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"Invalid prefix (%s) from %s",
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lbuffer, client_p->name);
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else
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{
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memcpy(sid, lsender, 3);
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sid[3] = '\0';
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server = find_server(NULL, sid);
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if (server != NULL && server->from == client_p)
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sendto_one(client_p, ":%s KILL %s :%s (Unknown Client)",
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get_id(&me, client_p), lsender, me.name);
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}
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}
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/*
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*
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* parc number of arguments ('sender' counted as one!)
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* parv[1]..parv[parc-1]
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* pointers to additional parameters, this is a NULL
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* terminated list (parv[parc] == NULL).
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*
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* *WARNING*
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* Numerics are mostly error reports. If there is something
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* wrong with the message, just *DROP* it! Don't even think of
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* sending back a neat error message -- big danger of creating
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* a ping pong error message...
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*/
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static void
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do_numeric(int numeric, client::client *client_p, client::client *source_p, int parc, const char *parv[])
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{
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client::client *target_p;
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chan::chan *chptr;
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if(parc < 2 || !is_server(*source_p))
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return;
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/* Remap low number numerics. */
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if(numeric < 100)
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numeric += 100;
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/*
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* Prepare the parameter portion of the message into 'buffer'.
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* (Because the buffer is twice as large as the message buffer
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* for the socket, no overflow can occur here... ...on current
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* assumptions--bets are off, if these are changed --msa)
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* Note: if buffer is non-empty, it will begin with SPACE.
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*/
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if(parc > 1)
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{
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char *t = buffer; /* Current position within the buffer */
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int i;
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int tl; /* current length of presently being built string in t */
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for (i = 2; i < (parc - 1); i++)
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{
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tl = sprintf(t, " %s", parv[i]);
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t += tl;
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}
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sprintf(t, " :%s", parv[parc - 1]);
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}
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if((target_p = find_client(parv[1])) != NULL)
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{
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if(is_me(*target_p))
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{
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/*
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* We shouldn't get numerics sent to us,
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* any numerics we do get indicate a bug somewhere..
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*/
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/* ugh. this is here because of nick collisions. when two servers
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* relink, they burst each other their nicks, then perform collides.
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* if there is a nick collision, BOTH servers will kill their own
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* nicks, and BOTH will kill the other servers nick, which wont exist,
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* because it will have been already killed by the local server.
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*
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* unfortunately, as we cant guarantee other servers will do the
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* "right thing" on a nick collision, we have to keep both kills.
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* ergo we need to ignore ERR_NOSUCHNICK. --fl_
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*/
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/* quick comment. This _was_ tried. i.e. assume the other servers
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* will do the "right thing" and kill a nick that is colliding.
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* unfortunately, it did not work. --Dianora
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*/
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/* note, now we send PING on server connect, we can
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* also get ERR_NOSUCHSERVER..
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*/
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if(numeric != ERR_NOSUCHNICK &&
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numeric != ERR_NOSUCHSERVER)
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sendto_realops_snomask(sno::GENERAL, L_ADMIN,
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"*** %s(via %s) sent a %03d numeric to me: %s",
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source_p->name,
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client_p->name, numeric, buffer);
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return;
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}
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else if(target_p->from == client_p)
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{
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/* This message changed direction (nick collision?)
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* ignore it.
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*/
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return;
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}
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/* csircd will send out unknown umode flag for +a (admin), drop it here. */
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if(numeric == ERR_UMODEUNKNOWNFLAG && my(*target_p))
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return;
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/* Fake it for server hiding, if its our client */
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sendto_one(target_p, ":%s %03d %s%s",
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get_id(source_p, target_p), numeric,
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get_id(target_p, target_p), buffer);
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return;
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}
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else if((chptr = chan::get(parv[1], std::nothrow)) != NULL)
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sendto_channel_flags(client_p, chan::ALL_MEMBERS, source_p, chptr,
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"%03d %s%s",
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numeric, chptr->name.c_str(), buffer);
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}
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void
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m_not_oper(struct MsgBuf *msgbuf_p, client::client &client, client::client &source, int parc, const char *parv[])
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{
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sendto_one_numeric(&source, ERR_NOPRIVILEGES, form_str(ERR_NOPRIVILEGES));
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}
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void
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m_unregistered(struct MsgBuf *msgbuf_p, client::client &client, client::client &source, int parc, const char *parv[])
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{
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if(is_any_server(client))
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return;
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/* bit of a hack.
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* I don't =really= want to waste a bit in a flag
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* number_of_nick_changes is only really valid after the client
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* is fully registered..
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*/
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if(client.localClient->number_of_nick_changes == 0)
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{
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sendto_one(&client, form_str(ERR_NOTREGISTERED), me.name);
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client.localClient->number_of_nick_changes++;
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}
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}
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void
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m_registered(struct MsgBuf *msgbuf_p, client::client &client, client::client &source, int parc, const char *parv[])
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{
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sendto_one(&client, form_str(ERR_ALREADYREGISTRED), me.name, source.name);
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}
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void
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m_ignore(struct MsgBuf *msgbuf_p, client::client &client, client::client &source, int parc, const char *parv[])
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{
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/* Does nothing */
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}
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} // namespace ircd
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