mirror of
https://github.com/pissnet/angiosperm.git
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7b6410135b
/modrestart used to be implemented as a normal command and could crash
when used remotely because it would reload m_encap, which was on the
call stack at the time. This was fixed in 41390bfe5f. However,
/modreload has exactly the same problem, so I'm giving it the
same treatment.
Incidentally: This bug was first discovered in ircd-seven, where the
`/mod*` commands themselves live in the core, so m_encap was the only way
the crash could happen (and it didn't most of the time, because m_encap
would only be moved if you got unlucky). But `/mod*` are in modules in
charybdis, so /modrestart would have unloaded the code it was in the
middle of executing. With that in mind, I'm not sure how it ever
appeared to work.
388 lines
11 KiB
C
388 lines
11 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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if(!find_shared_conf(source_p->username, source_p->host, source_p->servptr->name, SHARED_MODULE))
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{
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sendto_one_notice(source_p, ":*** You do not have an appropriate shared block "
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"to load modules on this server.");
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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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/* 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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if(!find_shared_conf(source_p->username, source_p->host, source_p->servptr->name, SHARED_MODULE))
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{
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sendto_one_notice(source_p, ":*** You do not have an appropriate shared block "
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"to load modules on this server.");
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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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/* 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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if(!find_shared_conf(source_p->username, source_p->host, source_p->servptr->name, SHARED_MODULE))
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{
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sendto_one_notice(source_p, ":*** You do not have an appropriate shared block "
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"to load modules on this server.");
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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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/* 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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if(!find_shared_conf(source_p->username, source_p->host, source_p->servptr->name, SHARED_MODULE))
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{
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sendto_one_notice(source_p, ":*** You do not have an appropriate shared block "
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"to load modules on this server.");
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return;
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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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if(!find_shared_conf(source_p->username, source_p->host, source_p->servptr->name, SHARED_MODULE))
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{
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sendto_one_notice(source_p, ":*** You do not have an appropriate shared block "
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"to load modules on this server.");
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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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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_event_addonce("modules_do_reload", modules_do_reload, info, 1);
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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_event_addonce("modules_do_restart", modules_do_restart, NULL, 1);
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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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