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unrealircd/src/api-efunctions.c
T
Bram Matthys b078a9c8b5 Fix cut-off and expansion issues with MODE, which is a possible problem when 
using mixed UnrealIRCd 5 and UnrealIRCd 6 networks.

This is a slightly complex rewrite of make_mode_str() and do_mode(),
as we nog go from single mode lines to potentially multiple mode lines.

In short: whenever we would be near buffer cut-off point (the famous
512 byte limit) then previously we would prevent the mode, though not
succesfully in all cases where a network consists of mixed 5.x and 6.x.
From this point onward we no longer do that. Instead we convert one
MODE command to two MODE lines if that is needed.
The benefit of this is that we no longer prevent it BEFORE processing
the MODE, which is a flawed method and could be wrong (causing desyncs).
And also, we no longer partially ignore MODE lines from clients when
they would cause the limit to be exceeded, as we replace them with
two MODE lines instead.

These are more changes than I wanted at such a late point but.. they seem
to be necessary to prevent U5-U6 compatibility issues.
2021-11-19 13:53:21 +01:00

410 lines
19 KiB
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/************************************************************************
* IRC - Internet Relay Chat, src/api-efunctions.c
* (C) 2003-2019 Bram Matthys (Syzop) and the UnrealIRCd Team
*
* See file AUTHORS in IRC package for additional names of
* the programmers.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 1, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "unrealircd.h"
/* Types */
typedef struct {
char *name;
void **funcptr;
void *deffunc;
} EfunctionsList;
/* Variables */
static Efunction *Efunctions[MAXEFUNCTIONS]; /* Efunction objects (used for rehashing) */
static EfunctionsList efunction_table[MAXEFUNCTIONS];
/* Efuncs */
void (*do_join)(Client *client, int parc, const char *parv[]);
void (*join_channel)(Channel *channel, Client *client, MessageTag *mtags, const char *member_modes);
int (*can_join)(Client *client, Channel *channel, const char *key, char **errmsg);
void (*do_mode)(Channel *channel, Client *client, MessageTag *mtags, int parc, const char *parv[], time_t sendts, int samode);
MultiLineMode *(*set_mode)(Channel *channel, Client *client, int parc, const char *parv[], u_int *pcount,
char pvar[MAXMODEPARAMS][MODEBUFLEN + 3]);
void (*set_channel_mode)(Channel *channel, char *modes, char *parameters);
void (*cmd_umode)(Client *client, MessageTag *mtags, int parc, const char *parv[]);
int (*register_user)(Client *client);
int (*tkl_hash)(unsigned int c);
char (*tkl_typetochar)(int type);
int (*tkl_chartotype)(char c);
const char *(*tkl_type_string)(TKL *tk);
const char *(*tkl_type_config_string)(TKL *tk);
char *(*tkl_uhost)(TKL *tkl, char *buf, size_t buflen, int options);
TKL *(*tkl_add_serverban)(int type, const char *usermask, const char *hostmask, const char *reason, const char *setby,
time_t expire_at, time_t set_at, int soft, int flags);
TKL *(*tkl_add_nameban)(int type, const char *name, int hold, const char *reason, const char *setby,
time_t expire_at, time_t set_at, int flags);
TKL *(*tkl_add_spamfilter)(int type, unsigned short target, unsigned short action, Match *match, const char *setby,
time_t expire_at, time_t set_at,
time_t spamf_tkl_duration, const char *spamf_tkl_reason,
int flags);
TKL *(*tkl_add_banexception)(int type, const char *usermask, const char *hostmask, const char *reason, const char *set_by,
time_t expire_at, time_t set_at, int soft, const char *bantypes, int flags);
TKL *(*tkl_del_line)(TKL *tkl);
void (*tkl_check_local_remove_shun)(TKL *tmp);
int (*find_tkline_match)(Client *client, int skip_soft);
int (*find_shun)(Client *client);
int(*find_spamfilter_user)(Client *client, int flags);
TKL *(*find_qline)(Client *client, const char *nick, int *ishold);
TKL *(*find_tkline_match_zap)(Client *client);
void (*tkl_stats)(Client *client, int type, const char *para, int *cnt);
void (*tkl_sync)(Client *client);
void (*cmd_tkl)(Client *client, MessageTag *mtags, int parc, const char *parv[]);
int (*place_host_ban)(Client *client, BanAction action, const char *reason, long duration);
int (*match_spamfilter)(Client *client, const char *str_in, int type, const char *cmd, const char *target, int flags, TKL **rettk);
int (*match_spamfilter_mtags)(Client *client, MessageTag *mtags, const char *cmd);
int (*join_viruschan)(Client *client, TKL *tk, int type);
const char *(*StripColors)(const char *text);
const char *(*StripControlCodes)(const char *text);
void (*spamfilter_build_user_string)(char *buf, const char *nick, Client *client);
void (*send_protoctl_servers)(Client *client, int response);
int (*verify_link)(Client *client, ConfigItem_link **link_out);
void (*introduce_user)(Client *to, Client *client);
void (*send_server_message)(Client *client);
void (*broadcast_md_client)(ModDataInfo *mdi, Client *client, ModData *md);
void (*broadcast_md_channel)(ModDataInfo *mdi, Channel *channel, ModData *md);
void (*broadcast_md_member)(ModDataInfo *mdi, Channel *channel, Member *m, ModData *md);
void (*broadcast_md_membership)(ModDataInfo *mdi, Client *client, Membership *m, ModData *md);
int (*check_banned)(Client *client, int exitflags);
int (*check_deny_version)(Client *client, const char *software, int protocol, const char *flags);
void (*broadcast_md_client_cmd)(Client *except, Client *sender, Client *acptr, const char *varname, const char *value);
void (*broadcast_md_channel_cmd)(Client *except, Client *sender, Channel *channel, const char *varname, const char *value);
void (*broadcast_md_member_cmd)(Client *except, Client *sender, Channel *channel, Client *acptr, const char *varname, const char *value);
void (*broadcast_md_membership_cmd)(Client *except, Client *sender, Client *acptr, Channel *channel, const char *varname, const char *value);
void (*moddata_add_s2s_mtags)(Client *client, MessageTag **mtags);
void (*moddata_extract_s2s_mtags)(Client *client, MessageTag *mtags);
void (*send_moddata_client)(Client *srv, Client *client);
void (*send_moddata_channel)(Client *srv, Channel *channel);
void (*send_moddata_members)(Client *srv);
void (*broadcast_moddata_client)(Client *client);
int (*match_user)(const char *rmask, Client *client, int options);
void (*userhost_changed)(Client *client);
void (*userhost_save_current)(Client *client);
void (*send_join_to_local_users)(Client *client, Channel *channel, MessageTag *mtags);
int (*do_nick_name)(char *nick);
int (*do_remote_nick_name)(char *nick);
const char *(*charsys_get_current_languages)(void);
void (*broadcast_sinfo)(Client *client, Client *to, Client *except);
void (*connect_server)(ConfigItem_link *aconf, Client *by, struct hostent *hp);
void (*parse_message_tags)(Client *client, char **str, MessageTag **mtag_list);
const char *(*mtags_to_string)(MessageTag *m, Client *client);
int (*can_send_to_channel)(Client *client, Channel *channel, const char **msgtext, const char **errmsg, int notice);
void (*broadcast_md_globalvar)(ModDataInfo *mdi, ModData *md);
void (*broadcast_md_globalvar_cmd)(Client *except, Client *sender, const char *varname, const char *value);
int (*tkl_ip_hash)(const char *ip);
int (*tkl_ip_hash_type)(int type);
void (*sendnotice_tkl_del)(const char *removed_by, TKL *tkl);
void (*sendnotice_tkl_add)(TKL *tkl);
void (*free_tkl)(TKL *tkl);
TKL *(*find_tkl_serverban)(int type, const char *usermask, const char *hostmask, int softban);
TKL *(*find_tkl_banexception)(int type, const char *usermask, const char *hostmask, int softban);
TKL *(*find_tkl_nameban)(int type, const char *name, int hold);
TKL *(*find_tkl_spamfilter)(int type, const char *match_string, unsigned short action, unsigned short target);
int (*find_tkl_exception)(int ban_type, Client *client);
int (*is_silenced)(Client *client, Client *acptr);
int (*del_silence)(Client *client, const char *mask);
int (*add_silence)(Client *client, const char *mask, int senderr);
void *(*labeled_response_save_context)(void);
void (*labeled_response_set_context)(void *ctx);
void (*labeled_response_force_end)(void);
void (*kick_user)(MessageTag *mtags, Channel *channel, Client *client, Client *victim, const char *comment);
int (*watch_add)(const char *nick, Client *client, int flags);
int (*watch_del)(const char *nick, Client *client, int flags);
int (*watch_del_list)(Client *client, int flags);
Watch *(*watch_get)(const char *nick);
int (*watch_check)(Client *client, int reply, int (*watch_notify)(Client *client, Watch *watch, Link *lp, int event));
void (*do_unreal_log_remote_deliver)(LogLevel loglevel, const char *subsystem, const char *event_id, MultiLine *msg, const char *json_serialized);
char *(*get_chmodes_for_user)(Client *client, const char *flags);
WhoisConfigDetails (*whois_get_policy)(Client *client, Client *target, const char *name);
Efunction *EfunctionAddMain(Module *module, EfunctionType eftype, int (*func)(), void (*vfunc)(), void *(*pvfunc)(), char *(*stringfunc)(), const char *(*conststringfunc)())
{
Efunction *p;
if (!module || !(module->options & MOD_OPT_OFFICIAL))
{
if (module)
module->errorcode = MODERR_INVALID;
return NULL;
}
p = safe_alloc(sizeof(Efunction));
if (func)
p->func.intfunc = func;
if (vfunc)
p->func.voidfunc = vfunc;
if (pvfunc)
p->func.pvoidfunc = pvfunc;
if (stringfunc)
p->func.stringfunc = stringfunc;
if (conststringfunc)
p->func.conststringfunc = conststringfunc;
p->type = eftype;
p->owner = module;
AddListItem(p, Efunctions[eftype]);
if (module)
{
ModuleObject *cbobj = safe_alloc(sizeof(ModuleObject));
cbobj->object.efunction = p;
cbobj->type = MOBJ_EFUNCTION;
AddListItem(cbobj, module->objects);
module->errorcode = MODERR_NOERROR;
}
return p;
}
Efunction *EfunctionDel(Efunction *cb)
{
Efunction *p, *q;
for (p = Efunctions[cb->type]; p; p = p->next)
{
if (p == cb)
{
q = p->next;
DelListItem(p, Efunctions[cb->type]);
if (*efunction_table[cb->type].funcptr == p)
*efunction_table[cb->type].funcptr = NULL;
if (p->owner)
{
ModuleObject *cbobj;
for (cbobj = p->owner->objects; cbobj; cbobj = cbobj->next)
{
if ((cbobj->type == MOBJ_EFUNCTION) && (cbobj->object.efunction == p))
{
DelListItem(cbobj, cb->owner->objects);
safe_free(cbobj);
break;
}
}
}
safe_free(p);
return q;
}
}
return NULL;
}
static int num_efunctions(EfunctionType eftype)
{
Efunction *e;
int cnt = 0;
#ifdef DEBUGMODE
if ((eftype < 0) || (eftype >= MAXEFUNCTIONS))
abort();
#endif
for (e = Efunctions[eftype]; e; e = e->next)
if (!e->willberemoved)
cnt++;
return cnt;
}
/** Ensure that all efunctions are present. */
int efunctions_check(void)
{
int i, n, errors=0;
for (i=0; i < MAXEFUNCTIONS; i++)
if (efunction_table[i].name)
{
n = num_efunctions(i);
if ((n != 1) && (errors > 10))
{
config_error("[--efunction errors truncated to prevent flooding--]");
break;
}
if ((n < 1) && !efunction_table[i].deffunc)
{
config_error("ERROR: efunction '%s' not found, you probably did not "
"load all required modules! (hint: see modules.default.conf)",
efunction_table[i].name);
errors++;
} else
if (n > 1)
{
config_error("ERROR: efunction '%s' was found %d times, perhaps you "
"loaded a module multiple times??",
efunction_table[i].name, n);
errors++;
}
}
return errors ? -1 : 0;
}
void efunctions_switchover(void)
{
Efunction *e;
int i;
/* Now set the real efunction, and tag the new one
* as 'willberemoved' if needed.
*/
for (i=0; i < MAXEFUNCTIONS; i++)
{
int found = 0;
for (e = Efunctions[i]; e; e = e->next)
{
if (e->willberemoved)
continue;
if (!efunction_table[i].funcptr)
{
unreal_log(ULOG_FATAL, "module", "BUG_EFUNCTIONS_SWITCHOVER", NULL,
"[BUG] efunctions_switchover(): someone forgot to initialize the function table for efunc $efunction_number",
log_data_integer("efunction_number", i));
abort();
}
*efunction_table[i].funcptr = e->func.voidfunc; /* This is the new one. */
if (!(e->owner->options & MOD_OPT_PERM))
e->willberemoved = 1;
found = 1;
break;
}
if (!found)
{
if (efunction_table[i].deffunc)
*efunction_table[i].funcptr = efunction_table[i].deffunc;
}
}
}
#define efunc_init_function(what, func, default_func) efunc_init_function_(what, #func, (void *)&func, (void *)default_func)
void efunc_init_function_(EfunctionType what, char *name, void *func, void *default_func)
{
if (what >= MAXEFUNCTIONS)
{
/* increase MAXEFUNCTIONS if you ever encounter that --k4be */
unreal_log(ULOG_FATAL, "module", "BUG_EFUNC_INIT_FUNCTION_TOO_MANY", NULL,
"Too many efunctions! ($efunctions_request > $efunctions_max)",
log_data_integer("efunctions_request", what),
log_data_integer("efunctions_max", MAXEFUNCTIONS));
abort();
}
safe_strdup(efunction_table[what].name, name);
efunction_table[what].funcptr = func;
efunction_table[what].deffunc = default_func;
}
void efunctions_init(void)
{
memset(&efunction_table, 0, sizeof(efunction_table));
efunc_init_function(EFUNC_DO_JOIN, do_join, NULL);
efunc_init_function(EFUNC_JOIN_CHANNEL, join_channel, NULL);
efunc_init_function(EFUNC_CAN_JOIN, can_join, NULL);
efunc_init_function(EFUNC_DO_MODE, do_mode, NULL);
efunc_init_function(EFUNC_SET_MODE, set_mode, NULL);
efunc_init_function(EFUNC_SET_CHANNEL_MODE, set_channel_mode, NULL);
efunc_init_function(EFUNC_CMD_UMODE, cmd_umode, NULL);
efunc_init_function(EFUNC_REGISTER_USER, register_user, NULL);
efunc_init_function(EFUNC_TKL_HASH, tkl_hash, NULL);
efunc_init_function(EFUNC_TKL_TYPETOCHAR, tkl_typetochar, NULL);
efunc_init_function(EFUNC_TKL_ADD_SERVERBAN, tkl_add_serverban, NULL);
efunc_init_function(EFUNC_TKL_ADD_BANEXCEPTION, tkl_add_banexception, NULL);
efunc_init_function(EFUNC_TKL_DEL_LINE, tkl_del_line, NULL);
efunc_init_function(EFUNC_TKL_CHECK_LOCAL_REMOVE_SHUN, tkl_check_local_remove_shun, NULL);
efunc_init_function(EFUNC_FIND_TKLINE_MATCH, find_tkline_match, NULL);
efunc_init_function(EFUNC_FIND_SHUN, find_shun, NULL);
efunc_init_function(EFUNC_FIND_SPAMFILTER_USER, find_spamfilter_user, NULL);
efunc_init_function(EFUNC_FIND_QLINE, find_qline, NULL);
efunc_init_function(EFUNC_FIND_TKLINE_MATCH_ZAP, find_tkline_match_zap, NULL);
efunc_init_function(EFUNC_TKL_STATS, tkl_stats, NULL);
efunc_init_function(EFUNC_TKL_SYNCH, tkl_sync, NULL);
efunc_init_function(EFUNC_CMD_TKL, cmd_tkl, NULL);
efunc_init_function(EFUNC_PLACE_HOST_BAN, place_host_ban, NULL);
efunc_init_function(EFUNC_MATCH_SPAMFILTER, match_spamfilter, NULL);
efunc_init_function(EFUNC_MATCH_SPAMFILTER_MTAGS, match_spamfilter_mtags, NULL);
efunc_init_function(EFUNC_JOIN_VIRUSCHAN, join_viruschan, NULL);
efunc_init_function(EFUNC_STRIPCOLORS, StripColors, NULL);
efunc_init_function(EFUNC_STRIPCONTROLCODES, StripControlCodes, NULL);
efunc_init_function(EFUNC_SPAMFILTER_BUILD_USER_STRING, spamfilter_build_user_string, NULL);
efunc_init_function(EFUNC_SEND_PROTOCTL_SERVERS, send_protoctl_servers, NULL);
efunc_init_function(EFUNC_VERIFY_LINK, verify_link, NULL);
efunc_init_function(EFUNC_SEND_SERVER_MESSAGE, send_server_message, NULL);
efunc_init_function(EFUNC_BROADCAST_MD_CLIENT, broadcast_md_client, NULL);
efunc_init_function(EFUNC_BROADCAST_MD_CHANNEL, broadcast_md_channel, NULL);
efunc_init_function(EFUNC_BROADCAST_MD_MEMBER, broadcast_md_member, NULL);
efunc_init_function(EFUNC_BROADCAST_MD_MEMBERSHIP, broadcast_md_membership, NULL);
efunc_init_function(EFUNC_CHECK_BANNED, check_banned, NULL);
efunc_init_function(EFUNC_INTRODUCE_USER, introduce_user, NULL);
efunc_init_function(EFUNC_CHECK_DENY_VERSION, check_deny_version, NULL);
efunc_init_function(EFUNC_BROADCAST_MD_CLIENT_CMD, broadcast_md_client_cmd, NULL);
efunc_init_function(EFUNC_BROADCAST_MD_CHANNEL_CMD, broadcast_md_channel_cmd, NULL);
efunc_init_function(EFUNC_BROADCAST_MD_MEMBER_CMD, broadcast_md_member_cmd, NULL);
efunc_init_function(EFUNC_BROADCAST_MD_MEMBERSHIP_CMD, broadcast_md_membership_cmd, NULL);
efunc_init_function(EFUNC_MODDATA_ADD_S2S_MTAGS, moddata_add_s2s_mtags, NULL);
efunc_init_function(EFUNC_MODDATA_EXTRACT_S2S_MTAGS, moddata_extract_s2s_mtags, NULL);
efunc_init_function(EFUNC_SEND_MODDATA_CLIENT, send_moddata_client, NULL);
efunc_init_function(EFUNC_SEND_MODDATA_CHANNEL, send_moddata_channel, NULL);
efunc_init_function(EFUNC_SEND_MODDATA_MEMBERS, send_moddata_members, NULL);
efunc_init_function(EFUNC_BROADCAST_MODDATA_CLIENT, broadcast_moddata_client, NULL);
efunc_init_function(EFUNC_MATCH_USER, match_user, NULL);
efunc_init_function(EFUNC_USERHOST_SAVE_CURRENT, userhost_save_current, NULL);
efunc_init_function(EFUNC_USERHOST_CHANGED, userhost_changed, NULL);
efunc_init_function(EFUNC_SEND_JOIN_TO_LOCAL_USERS, send_join_to_local_users, NULL);
efunc_init_function(EFUNC_DO_NICK_NAME, do_nick_name, NULL);
efunc_init_function(EFUNC_DO_REMOTE_NICK_NAME, do_remote_nick_name, NULL);
efunc_init_function(EFUNC_CHARSYS_GET_CURRENT_LANGUAGES, charsys_get_current_languages, NULL);
efunc_init_function(EFUNC_BROADCAST_SINFO, broadcast_sinfo, NULL);
efunc_init_function(EFUNC_CONNECT_SERVER, connect_server, NULL);
efunc_init_function(EFUNC_PARSE_MESSAGE_TAGS, parse_message_tags, &parse_message_tags_default_handler);
efunc_init_function(EFUNC_MTAGS_TO_STRING, mtags_to_string, &mtags_to_string_default_handler);
efunc_init_function(EFUNC_TKL_CHARTOTYPE, tkl_chartotype, NULL);
efunc_init_function(EFUNC_TKL_TYPE_STRING, tkl_type_string, NULL);
efunc_init_function(EFUNC_TKL_TYPE_CONFIG_STRING, tkl_type_config_string, NULL);
efunc_init_function(EFUNC_CAN_SEND_TO_CHANNEL, can_send_to_channel, NULL);
efunc_init_function(EFUNC_BROADCAST_MD_GLOBALVAR, broadcast_md_globalvar, NULL);
efunc_init_function(EFUNC_BROADCAST_MD_GLOBALVAR_CMD, broadcast_md_globalvar_cmd, NULL);
efunc_init_function(EFUNC_TKL_IP_HASH, tkl_ip_hash, NULL);
efunc_init_function(EFUNC_TKL_IP_HASH_TYPE, tkl_ip_hash_type, NULL);
efunc_init_function(EFUNC_TKL_ADD_NAMEBAN, tkl_add_nameban, NULL);
efunc_init_function(EFUNC_TKL_ADD_SPAMFILTER, tkl_add_spamfilter, NULL);
efunc_init_function(EFUNC_SENDNOTICE_TKL_ADD, sendnotice_tkl_add, NULL);
efunc_init_function(EFUNC_SENDNOTICE_TKL_DEL, sendnotice_tkl_del, NULL);
efunc_init_function(EFUNC_FREE_TKL, free_tkl, NULL);
efunc_init_function(EFUNC_FIND_TKL_SERVERBAN, find_tkl_serverban, NULL);
efunc_init_function(EFUNC_FIND_TKL_BANEXCEPTION, find_tkl_banexception, NULL);
efunc_init_function(EFUNC_FIND_TKL_NAMEBAN, find_tkl_nameban, NULL);
efunc_init_function(EFUNC_FIND_TKL_SPAMFILTER, find_tkl_spamfilter, NULL);
efunc_init_function(EFUNC_FIND_TKL_EXCEPTION, find_tkl_exception, NULL);
efunc_init_function(EFUNC_ADD_SILENCE, add_silence, add_silence_default_handler);
efunc_init_function(EFUNC_DEL_SILENCE, del_silence, del_silence_default_handler);
efunc_init_function(EFUNC_IS_SILENCED, is_silenced, is_silenced_default_handler);
efunc_init_function(EFUNC_LABELED_RESPONSE_SAVE_CONTEXT, labeled_response_save_context, labeled_response_save_context_default_handler);
efunc_init_function(EFUNC_LABELED_RESPONSE_SET_CONTEXT, labeled_response_set_context, labeled_response_set_context_default_handler);
efunc_init_function(EFUNC_LABELED_RESPONSE_FORCE_END, labeled_response_force_end, labeled_response_force_end_default_handler);
efunc_init_function(EFUNC_KICK_USER, kick_user, NULL);
efunc_init_function(EFUNC_WATCH_ADD, watch_add, NULL);
efunc_init_function(EFUNC_WATCH_DEL, watch_del, NULL);
efunc_init_function(EFUNC_WATCH_DEL_LIST, watch_del_list, NULL);
efunc_init_function(EFUNC_WATCH_GET, watch_get, NULL);
efunc_init_function(EFUNC_WATCH_CHECK, watch_check, NULL);
efunc_init_function(EFUNC_TKL_UHOST, tkl_uhost, NULL);
efunc_init_function(EFUNC_DO_UNREAL_LOG_REMOTE_DELIVER, do_unreal_log_remote_deliver, do_unreal_log_remote_deliver_default_handler);
efunc_init_function(EFUNC_GET_CHMODES_FOR_USER, get_chmodes_for_user, NULL);
efunc_init_function(EFUNC_WHOIS_GET_POLICY, whois_get_policy, NULL);
}
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