a9505057c5
Commit41390bfe5ffixed a bug whereby the processing of a MODRESTART command could result in a crash. The approach taken in this fix was to defer the reloading of all modules so that the call stack does not contain functions located in modules that are being reloaded. It did this by scheduling a one-shot timer event for 1 second in the future, in the absense of any better deferral mechanism at the time. Timers are processed by the event loop, which is core to IRCd and cannot be reloaded. Commit59ea3c6753introduced a mechanism to defer the execution of a function until all events have been processed by the event loop, in order to fix a REHASH bug that could result in a crash due to closing and reopening listener sockets with a pending socket connection event to process after the REHASH was completed. Rework commit41390bfe5fto use the new deferral mechanism introduced by commit59ea3c6753and do the same for module reloads.
353 lines
9.7 KiB
C
353 lines
9.7 KiB
C
/* modules/m_modules.c - module for module loading
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* Copyright (c) 2016 Elizabeth Myers <elizabeth@interlinked.me>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "stdinc.h"
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#include "client.h"
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#include "parse.h"
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#include "msg.h"
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#include "modules.h"
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#include "s_newconf.h"
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#include "s_conf.h"
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#include "s_serv.h"
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#include "hash.h"
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#include "ircd.h"
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#include "match.h"
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#include "numeric.h"
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#include "send.h"
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#include "packet.h"
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#include "logger.h"
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static const char modules_desc[] = "Provides module management commands";
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static void mo_modload(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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static void mo_modlist(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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static void mo_modreload(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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static void mo_modunload(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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static void mo_modrestart(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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static void me_modload(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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static void me_modlist(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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static void me_modreload(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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static void me_modunload(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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static void me_modrestart(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
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static void do_modload(struct Client *, const char *);
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static void do_modunload(struct Client *, const char *);
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static void do_modreload(struct Client *, const char *);
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static void do_modlist(struct Client *, const char *);
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static void do_modrestart(struct Client *);
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extern void modules_do_reload(void *); /* end of ircd/modules.c */
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extern void modules_do_restart(void *); /* end of ircd/modules.c */
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struct Message modload_msgtab = {
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"MODLOAD", 0, 0, 0, 0,
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{mg_unreg, mg_not_oper, mg_ignore, mg_ignore, {me_modload, 2}, {mo_modload, 2}}
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};
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struct Message modunload_msgtab = {
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"MODUNLOAD", 0, 0, 0, 0,
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{mg_unreg, mg_not_oper, mg_ignore, mg_ignore, {me_modunload, 2}, {mo_modunload, 2}}
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};
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struct Message modreload_msgtab = {
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"MODRELOAD", 0, 0, 0, 0,
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{mg_unreg, mg_not_oper, mg_ignore, mg_ignore, {me_modreload, 2}, {mo_modreload, 2}}
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};
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struct Message modlist_msgtab = {
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"MODLIST", 0, 0, 0, 0,
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{mg_unreg, mg_not_oper, mg_ignore, mg_ignore, {me_modlist, 0}, {mo_modlist, 0}}
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};
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struct Message modrestart_msgtab = {
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"MODRESTART", 0, 0, 0, 0,
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{mg_unreg, mg_not_oper, mg_ignore, mg_ignore, {me_modrestart, 0}, {mo_modrestart, 0}}
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};
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mapi_clist_av1 modules_clist[] = { &modload_msgtab, &modunload_msgtab, &modreload_msgtab, &modlist_msgtab, &modrestart_msgtab, NULL };
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DECLARE_MODULE_AV2(modules, NULL, NULL, modules_clist, NULL, NULL, NULL, NULL, modules_desc);
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/* load a module .. */
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static void
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mo_modload(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char **parv)
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{
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if(!IsOperAdmin(source_p))
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{
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sendto_one(source_p, form_str(ERR_NOPRIVS),
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me.name, source_p->name, "admin");
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return;
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}
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if(parc > 2)
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{
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sendto_match_servs(source_p, parv[2], CAP_ENCAP, NOCAPS,
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"ENCAP %s MODLOAD %s", parv[2], parv[1]);
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if(match(parv[2], me.name) == 0)
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return;
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}
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do_modload(source_p, parv[1]);
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}
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static void
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me_modload(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char **parv)
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{
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do_modload(source_p, parv[1]);
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}
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/* unload a module .. */
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static void
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mo_modunload(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char **parv)
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{
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if(!IsOperAdmin(source_p))
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{
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sendto_one(source_p, form_str(ERR_NOPRIVS),
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me.name, source_p->name, "admin");
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return;
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}
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if(parc > 2)
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{
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sendto_match_servs(source_p, parv[2], CAP_ENCAP, NOCAPS,
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"ENCAP %s MODUNLOAD %s", parv[2], parv[1]);
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if(match(parv[2], me.name) == 0)
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return;
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}
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do_modunload(source_p, parv[1]);
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}
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static void
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me_modunload(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char **parv)
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{
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do_modunload(source_p, parv[1]);
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}
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/* unload and load in one! */
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static void
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mo_modreload(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char **parv)
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{
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if(!IsOperAdmin(source_p))
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{
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sendto_one(source_p, form_str(ERR_NOPRIVS),
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me.name, source_p->name, "admin");
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return;
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}
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if(parc > 2)
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{
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sendto_match_servs(source_p, parv[2], CAP_ENCAP, NOCAPS,
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"ENCAP %s MODRELOAD %s", parv[2], parv[1]);
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if(match(parv[2], me.name) == 0)
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return;
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}
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do_modreload(source_p, parv[1]);
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}
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static void
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me_modreload(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char **parv)
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{
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do_modreload(source_p, parv[1]);
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}
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/* list modules .. */
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static void
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mo_modlist(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char **parv)
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{
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if(!IsOperAdmin(source_p))
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{
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sendto_one(source_p, form_str(ERR_NOPRIVS),
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me.name, source_p->name, "admin");
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return;
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}
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if(parc > 2)
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{
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sendto_match_servs(source_p, parv[2], CAP_ENCAP, NOCAPS,
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"ENCAP %s MODLIST %s", parv[2], parv[1]);
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if(match(parv[2], me.name) == 0)
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return;
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}
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do_modlist(source_p, parc > 1 ? parv[1] : 0);
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}
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static void
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me_modlist(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char **parv)
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{
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do_modlist(source_p, parv[1]);
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}
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/* unload and reload all modules */
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static void
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mo_modrestart(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char **parv)
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{
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if(!IsOperAdmin(source_p))
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{
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sendto_one(source_p, form_str(ERR_NOPRIVS),
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me.name, source_p->name, "admin");
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return;
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}
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if(parc > 1)
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{
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sendto_match_servs(source_p, parv[1], CAP_ENCAP, NOCAPS,
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"ENCAP %s MODRESTART", parv[1]);
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if(match(parv[1], me.name) == 0)
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return;
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}
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do_modrestart(source_p);
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}
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static void
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me_modrestart(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char **parv)
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{
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do_modrestart(source_p);
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}
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static void
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do_modload(struct Client *source_p, const char *module)
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{
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char *m_bn = rb_basename(module);
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int origin;
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if(findmodule_byname(m_bn) != NULL)
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{
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sendto_one_notice(source_p, ":Module %s is already loaded", m_bn);
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rb_free(m_bn);
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return;
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}
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mod_remember_clicaps();
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origin = strcmp(module, m_bn) == 0 ? MAPI_ORIGIN_CORE : MAPI_ORIGIN_EXTENSION;
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load_one_module(module, origin, false);
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mod_notify_clicaps();
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rb_free(m_bn);
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}
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static void
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do_modunload(struct Client *source_p, const char *module)
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{
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struct module *mod;
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char *m_bn = rb_basename(module);
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if((mod = findmodule_byname(m_bn)) == NULL)
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{
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sendto_one_notice(source_p, ":Module %s is not loaded", m_bn);
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rb_free(m_bn);
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return;
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}
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if(mod->core)
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{
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sendto_one_notice(source_p, ":Module %s is a core module and may not be unloaded", m_bn);
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rb_free(m_bn);
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return;
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}
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mod_remember_clicaps();
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if(unload_one_module(m_bn, true) == false)
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sendto_one_notice(source_p, ":Module %s is not loaded", m_bn);
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mod_notify_clicaps();
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rb_free(m_bn);
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}
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static void
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do_modreload(struct Client *source_p, const char *module)
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{
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struct modreload *info = rb_malloc(sizeof *info);
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strcpy(info->module, module);
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strcpy(info->id, source_p->id);
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rb_defer(&modules_do_reload, info);
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}
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static void
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do_modrestart(struct Client *source_p)
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{
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sendto_one_notice(source_p, ":Reloading all modules");
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/*
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* If a remote MODRESTART is received, m_encap.so will be reloaded,
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* but ms_encap is in the call stack (it indirectly calls this
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* function). Also, this function is itself in a module.
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*
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* This will go horribly wrong if either module is reloaded to a
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* different address.
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*
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* So, defer the restart to the event loop and return now.
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*/
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rb_defer(&modules_do_restart, NULL);
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}
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static void
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do_modlist(struct Client *source_p, const char *pattern)
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{
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rb_dlink_node *ptr;
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RB_DLINK_FOREACH(ptr, module_list.head)
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{
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struct module *mod = ptr->data;
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const char *origin;
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switch (mod->origin)
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{
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case MAPI_ORIGIN_EXTENSION:
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origin = "extension";
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break;
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case MAPI_ORIGIN_CORE:
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origin = "builtin";
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break;
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default:
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origin = "unknown";
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break;
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}
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if(pattern)
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{
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if(match(pattern, mod->name))
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{
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sendto_one(source_p, form_str(RPL_MODLIST),
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me.name, source_p->name,
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mod->name,
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(unsigned long)(uintptr_t)mod->address, origin,
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mod->core ? " (core)" : "", mod->version, mod->description);
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}
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}
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else
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{
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sendto_one(source_p, form_str(RPL_MODLIST),
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me.name, source_p->name, mod->name,
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(unsigned long)(uintptr_t)mod->address, origin,
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mod->core ? " (core)" : "", mod->version, mod->description);
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}
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}
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sendto_one(source_p, form_str(RPL_ENDOFMODLIST), me.name, source_p->name);
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}
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