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         /* didn't change +p umode, we don't need to do anything */
 111         if (!((data->oldumodes ^ source_p->umodes) & user_modes['p']))
 112                 return;
 113
 114         if (!IsOperOverride(source_p))
 115         {
 116                 sendto_one_notice(source_p, ":*** You need oper:override privilege for +p");
 117                 source_p->umodes &= ~user_modes['p'];
 118                 return;
 119         }
 120
 121         if (source_p->umodes & user_modes['p'])
 122         {
 123                 update_session_deadline(source_p, NULL);
 124
 125                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s has enabled oper-override (+p)",
 126                                        get_oper_name(source_p));
 127         }
 128         else if (!(source_p->umodes & user_modes['p']))
 129         {
 130                 rb_dlink_node *n, *tn;
 131
 132                 RB_DLINK_FOREACH_SAFE(n, tn, overriding_opers.head)
 133                 {
 134                         struct OverrideSession *session_p = n->data;
 135
 136                         if (session_p->client != source_p)
 137                                 continue;
 138
 139                         sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s has disabled oper-override (+p)",
 140                                                get_oper_name(session_p->client));
 141
 142                         rb_dlinkDelete(n, &overriding_opers);
 143                         rb_free(session_p);
 144                 }
 145         }
 146 }
 147
 148 static void
 149 hack_channel_access(void *vdata)
 150 {
 151         hook_data_channel_approval *data = (hook_data_channel_approval *) vdata;
 152
 153         if (data->approved == CHFL_CHANOP)
 154                 return;
 155
 156         if (data->client->umodes & user_modes['p'])
 157         {
 158                 update_session_deadline(data->client, NULL);
 159                 data->approved = CHFL_CHANOP;
 160
 161                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s is using oper-override on %s (modehacking)",
 162                                        get_oper_name(data->client), data->chptr->chname);
 163         }
 164 }
 165
 166 static void
 167 hack_can_join(void *vdata)
 168 {
 169         hook_data_channel *data = (hook_data_channel *) vdata;
 170
 171         if (data->approved == 0)
 172                 return;
 173
 174         if (data->client->umodes & user_modes['p'])
 175         {
 176                 update_session_deadline(data->client, NULL);
 177                 data->approved = 0;
 178
 179                 sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s is using oper-override on %s (banwalking)",
 180                                        get_oper_name(data->client), data->chptr->chname);
 181         }
 182 }
 183
 184 static void
 185 hack_can_send(void *vdata)
 186 {
 187         hook_data_channel_approval *data = (hook_data_channel_approval *) vdata;
 188
 189         if (data->approved == CAN_SEND_NONOP || data->approved == CAN_SEND_OPV)
 190                 return;
 191
 192         if (data->client->umodes & user_modes['p'])
 193         {
 194                 data->approved = CAN_SEND_NONOP;
 195
 196                 if (MyClient(data->client))
 197                 {
 198                         update_session_deadline(data->client, NULL);
 199                         sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "%s is using oper-override on %s (forcing message)",
 200                                                get_oper_name(data->client), data->chptr->chname);
 201                 }
 202         }
 203 }
 204
 205 static void
 206 handle_client_exit(void *vdata)
 207 {
 208         hook_data_client_exit *data = (hook_data_client_exit *) vdata;
 209         rb_dlink_node *n, *tn;
 210         struct Client *source_p = data->target;
 211
 212         RB_DLINK_FOREACH_SAFE(n, tn, overriding_opers.head)
 213         {
 214                 struct OverrideSession *session_p = n->data;
 215
 216                 if (session_p->client != source_p)
 217                         continue;
 218
 219                 rb_dlinkDelete(n, &overriding_opers);
 220                 rb_free(session_p);
 221         }
 222 }
 223
 224 struct ev_entry *expire_override_deadlines_ev = NULL;
 225
 226 static int
 227 _modinit(void)
 228 {
 229         /* add the usermode to the available slot */
 230         user_modes['p'] = find_umode_slot();
 231         construct_umodebuf();
 232
 233         expire_override_deadlines_ev = rb_event_add("expire_override_deadlines", expire_override_deadlines, NULL, 60);
 234
 235         return 0;
 236 }
 237
 238 static void
 239 _moddeinit(void)
 240 {
 241         /* disable the umode and remove it from the available list */
 242         user_modes['p'] = 0;
 243         construct_umodebuf();
 244
 245         rb_event_delete(expire_override_deadlines_ev);
 246 }
 247
 248 DECLARE_MODULE_AV1(override, _modinit, _moddeinit, NULL, NULL,
 249                         override_hfnlist, "$Revision: 3526 $");