extensions/override.c

   1 /*
   2  * oper-override for charybdis.
   3  *
   4  * adds usermode +p and has a timer event that is iterated over to disable
   5  * usermode +p after a while...
   6  *
   7  * you need to have oper:override permission on the opers you want to be
   8  * able to use this extension.
   9  */
  10
  11 #include "stdinc.h"
  12 #include "modules.h"
  13 #include "hook.h"
  14 #include "client.h"
  15 #include "ircd.h"
  16 #include "send.h"
  17 #include "hash.h"
  18 #include "s_conf.h"
  19 #include "s_user.h"
  20 #include "s_serv.h"
  21 #include "numeric.h"
  22 #include "privilege.h"
  23 #include "s_newconf.h"
  24
  25 static void check_umode_change(void *data);
  26 static void hack_channel_access(void *data);
  27 static void hack_can_join(void *data);
  28 static void hack_can_send(void *data);
  29 static void handle_client_exit(void *data);
  30
  31 mapi_hfn_list_av1 override_hfnlist[] = {
  32         { "umode_changed", (hookfn) check_umode_change },
  33         { "get_channel_access", (hookfn) hack_channel_access },
  34         { "can_join", (hookfn) hack_can_join },
  35         { "can_send", (hookfn) hack_can_send },
  36         { "client_exit", (hookfn) handle_client_exit },
  37         { NULL, NULL }
  38 };
  39
  40 #define IsOperOverride(x)       (HasPrivilege((x), "oper:override"))
  41
  42 struct OverrideSession {
  43         rb_dlink_node node;
  44
  45         struct Client *client;
  46         time_t deadline;
  47 };
  48
  49 rb_dlink_list overriding_opers = { NULL, NULL, 0 };
  50
  51 static void
  52 update_session_deadline(struct Client *source_p, struct OverrideSession *session_p)
  53 {
  54         if (session_p == NULL)
  55         {
  56                 rb_dlink_node *n;
  57
  58                 RB_DLINK_FOREACH(n, overriding_opers.head)
  59                 {
  60                         struct OverrideSession *s = n->data;
  61
  62                         if (s->client == source_p)
  63                         {
  64                                 session_p = s;
  65                                 break;
  66                         }
  67                 }
  68         }
  69
  70         if (session_p == NULL)
  71         {
  72                 session_p = rb_malloc(sizeof(struct OverrideSession));
  73                 session_p->client = source_p;
  74         }
  75
  76         session_p->deadline = rb_current_time() + 1800;
  77
  78         rb_dlinkDelete(&session_p->node, &overriding_opers);
  79         rb_dlinkAdd(session_p, &session_p->node, &overriding_opers);
  80 }
  81
  82 static void
  83 expire_override_deadlines(void *unused)
  84 {
  85         rb_dlink_node *n, *tn;
  86
  87         RB_DLINK_FOREACH_SAFE(n, tn, overriding_opers.head)
  88         {
  89                 struct OverrideSession *session_p = n->data;
  90
  91                 if (session_p->deadline > rb_current_time())
  92                         break;
  93                 else if (session_p->deadline < rb_current_time())
  94                 {
  95                         const char *parv[4] = {session_p->client->name, session_p->client->name, "-p", NULL};
  96                         user_mode(session_p->client, session_p->client, 3, parv);
  97                 }
  98         }
  99 }
 100
 101 static void
 102 check_umode_change(void *vdata)
 103 {
 104         hook_data_umode_changed *data = (hook_data_umode_changed *)vdata;
 105         struct Client *source_p = data->client;
 106
 107         if (!MyClient(source_p))
 108                 return;
 109
 110         if (data->oldumodes & UMODE_OPER && !IsOper(source_p))
 111                 source_p->umodes &= ~user_modes['p'];
 112
 113         /* didn't change +p umode, we don't need to do anything */
 114         if (!((data->oldumodes ^ source_p->umodes) & user_modes['p']))
 115                 return;
 116
 117         if (source_p->umodes & user_modes['p'])
 118         {
 119                 if (!IsOperOverride(source_p))
 120                 {
 121                         sendto_one_notice(source_p, ":*** You need oper:override privilege for +p");
 122                         source_p->umodes &= ~user_modes['p'];
 123                         return;
 124                 }
 125
 126                 update_session_deadline(source_p, NULL);
 127
 128                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s has enabled oper-override (+p)",
 129                                        get_oper_name(source_p));
 130         }
 131         else if (!(source_p->umodes & user_modes['p']))
 132         {
 133                 rb_dlink_node *n, *tn;
 134
 135                 RB_DLINK_FOREACH_SAFE(n, tn, overriding_opers.head)
 136                 {
 137                         struct OverrideSession *session_p = n->data;
 138
 139                         if (session_p->client != source_p)
 140                                 continue;
 141
 142                         sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s has disabled oper-override (+p)",
 143                                                get_oper_name(session_p->client));
 144
 145                         rb_dlinkDelete(n, &overriding_opers);
 146                         rb_free(session_p);
 147                 }
 148         }
 149 }
 150
 151 static void
 152 hack_channel_access(void *vdata)
 153 {
 154         hook_data_channel_approval *data = (hook_data_channel_approval *) vdata;
 155
 156         if (data->approved == CHFL_CHANOP)
 157                 return;
 158
 159         if (data->client->umodes & user_modes['p'])
 160         {
 161                 update_session_deadline(data->client, NULL);
 162                 data->approved = CHFL_CHANOP;
 163
 164                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s is using oper-override on %s (modehacking)",
 165                                        get_oper_name(data->client), data->chptr->chname);
 166         }
 167 }
 168
 169 static void
 170 hack_can_join(void *vdata)
 171 {
 172         hook_data_channel *data = (hook_data_channel *) vdata;
 173
 174         if (data->approved == 0)
 175                 return;
 176
 177         if (data->client->umodes & user_modes['p'])
 178         {
 179                 update_session_deadline(data->client, NULL);
 180                 data->approved = 0;
 181
 182                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s is using oper-override on %s (banwalking)",
 183                                        get_oper_name(data->client), data->chptr->chname);
 184         }
 185 }
 186
 187 static void
 188 hack_can_send(void *vdata)
 189 {
 190         hook_data_channel_approval *data = (hook_data_channel_approval *) vdata;
 191
 192         if (data->approved == CAN_SEND_NONOP || data->approved == CAN_SEND_OPV)
 193                 return;
 194
 195         if (data->client->umodes & user_modes['p'])
 196         {
 197                 data->approved = CAN_SEND_NONOP;
 198
 199                 if (MyClient(data->client))
 200                 {
 201                         update_session_deadline(data->client, NULL);
 202                         sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s is using oper-override on %s (forcing message)",
 203                                                get_oper_name(data->client), data->chptr->chname);
 204                 }
 205         }
 206 }
 207
 208 static void
 209 handle_client_exit(void *vdata)
 210 {
 211         hook_data_client_exit *data = (hook_data_client_exit *) vdata;
 212         rb_dlink_node *n, *tn;
 213         struct Client *source_p = data->target;
 214
 215         RB_DLINK_FOREACH_SAFE(n, tn, overriding_opers.head)
 216         {
 217                 struct OverrideSession *session_p = n->data;
 218
 219                 if (session_p->client != source_p)
 220                         continue;
 221
 222                 rb_dlinkDelete(n, &overriding_opers);
 223                 rb_free(session_p);
 224         }
 225 }
 226
 227 struct ev_entry *expire_override_deadlines_ev = NULL;
 228
 229 static int
 230 _modinit(void)
 231 {
 232         /* add the usermode to the available slot */
 233         user_modes['p'] = find_umode_slot();
 234         construct_umodebuf();
 235
 236         expire_override_deadlines_ev = rb_event_add("expire_override_deadlines", expire_override_deadlines, NULL, 60);
 237
 238         return 0;
 239 }
 240
 241 static void
 242 _moddeinit(void)
 243 {
 244         /* disable the umode and remove it from the available list */
 245         user_modes['p'] = 0;
 246         construct_umodebuf();
 247
 248         rb_event_delete(expire_override_deadlines_ev);
 249 }
 250
 251 DECLARE_MODULE_AV1(override, _modinit, _moddeinit, NULL, NULL,
 252                         override_hfnlist, "$Revision: 3526 $");