4 * This module handles the expiry of old messages and the purging of old users.
11 * A brief technical discussion:
13 * Several of the purge operations found in this module operate in two
14 * stages: the first stage generates a linked list of objects to be deleted,
15 * then the second stage deletes all listed objects from the database.
17 * At first glance this may seem cumbersome and unnecessary. The reason it is
18 * implemented in this way is because GDBM (and perhaps some other backends we
19 * may hook into in the future) explicitly do _not_ support the deletion of
20 * records from a file while the file is being traversed. The delete operation
21 * will succeed, but the traversal is not guaranteed to visit every object if
22 * this is done. Therefore we utilize the two-stage purge.
34 #include <sys/types.h>
43 #include "sysdep_decls.h"
44 #include "citserver.h"
47 #include "dynloader.h"
58 char v_roomname[ROOMNAMELEN];
65 struct PurgeList *next;
66 char name[ROOMNAMELEN]; /* use the larger of username or roomname */
70 struct VPurgeList *next;
77 struct ValidRoom *next;
83 struct ValidUser *next;
87 struct PurgeList *UserPurgeList = NULL;
88 struct PurgeList *RoomPurgeList = NULL;
89 struct ValidRoom *ValidRoomList = NULL;
90 struct ValidUser *ValidUserList = NULL;
93 extern struct CitContext *ContextList;
95 void DoPurgeMessages(struct quickroom *qrbuf, void *data) {
96 struct ExpirePolicy epbuf;
99 struct CtdlMessage *msg;
101 struct cdbdata *cdbfr;
102 long *msglist = NULL;
106 GetExpirePolicy(&epbuf, qrbuf);
108 /* If the room is set to never expire messages ... do nothing */
109 if (epbuf.expire_mode == EXPIRE_NEXTLEVEL) return;
110 if (epbuf.expire_mode == EXPIRE_MANUAL) return;
112 begin_critical_section(S_QUICKROOM);
113 cdbfr = cdb_fetch(CDB_MSGLISTS, &qrbuf->QRnumber, sizeof(long));
116 msglist = mallok(cdbfr->len);
117 memcpy(msglist, cdbfr->ptr, cdbfr->len);
118 num_msgs = cdbfr->len / sizeof(long);
122 /* Nothing to do if there aren't any messages */
124 end_critical_section(S_QUICKROOM);
128 /* If the room is set to expire by count, do that */
129 if (epbuf.expire_mode == EXPIRE_NUMMSGS) {
130 while (num_msgs > epbuf.expire_value) {
132 lprintf(5, "Expiring message %ld\n", delnum);
133 AdjRefCount(delnum, -1);
134 memcpy(&msglist[0], &msglist[1],
135 (sizeof(long)*(num_msgs - 1)));
141 /* If the room is set to expire by age... */
142 if (epbuf.expire_mode == EXPIRE_AGE) {
143 for (a=0; a<num_msgs; ++a) {
146 msg = CtdlFetchMessage(delnum);
148 xtime = atol(msg->cm_fields['T']);
149 CtdlFreeMessage(msg);
155 && (now - xtime > (time_t)(epbuf.expire_value * 86400L))) {
156 lprintf(5, "Expiring message %ld\n", delnum);
157 AdjRefCount(delnum, -1);
165 num_msgs = sort_msglist(msglist, num_msgs);
168 cdb_store(CDB_MSGLISTS, &qrbuf->QRnumber, sizeof(long),
169 msglist, (num_msgs * sizeof(long)) );
171 if (msglist != NULL) phree(msglist);
173 end_critical_section(S_QUICKROOM);
176 void PurgeMessages(void) {
177 lprintf(5, "PurgeMessages() called\n");
179 ForEachRoom(DoPurgeMessages, NULL);
183 void AddValidUser(struct usersupp *usbuf, void *data) {
184 struct ValidUser *vuptr;
186 vuptr = (struct ValidUser *)mallok(sizeof(struct ValidUser));
187 vuptr->next = ValidUserList;
188 vuptr->vu_usernum = usbuf->usernum;
189 ValidUserList = vuptr;
192 void AddValidRoom(struct quickroom *qrbuf, void *data) {
193 struct ValidRoom *vrptr;
195 vrptr = (struct ValidRoom *)mallok(sizeof(struct ValidRoom));
196 vrptr->next = ValidRoomList;
197 vrptr->vr_roomnum = qrbuf->QRnumber;
198 vrptr->vr_roomgen = qrbuf->QRgen;
199 ValidRoomList = vrptr;
202 void DoPurgeRooms(struct quickroom *qrbuf, void *data) {
203 time_t age, purge_secs;
204 struct PurgeList *pptr;
205 struct ValidUser *vuptr;
208 /* For mailbox rooms, there's only one purging rule: if the user who
209 * owns the room still exists, we keep the room; otherwise, we purge
210 * it. Bypass any other rules.
212 if (qrbuf->QRflags & QR_MAILBOX) {
213 for (vuptr=ValidUserList; vuptr!=NULL; vuptr=vuptr->next) {
214 if (vuptr->vu_usernum == atol(qrbuf->QRname)) {
224 /* Any of these attributes render a room non-purgable */
225 if (qrbuf->QRflags & QR_PERMANENT) return;
226 if (qrbuf->QRflags & QR_DIRECTORY) return;
227 if (qrbuf->QRflags & QR_NETWORK) return;
228 if (is_noneditable(qrbuf)) return;
230 /* If we don't know the modification date, be safe and don't purge */
231 if (qrbuf->QRmtime <= (time_t)0) return;
233 /* If no room purge time is set, be safe and don't purge */
234 if (config.c_roompurge < 0) return;
236 /* Otherwise, check the date of last modification */
237 age = time(NULL) - (qrbuf->QRmtime);
238 purge_secs = (time_t)config.c_roompurge * (time_t)86400;
239 if (purge_secs <= (time_t)0) return;
240 lprintf(9, "<%s> is <%ld> seconds old\n", qrbuf->QRname, age);
241 if (age > purge_secs) do_purge = 1;
243 BYPASS: if (do_purge) {
244 pptr = (struct PurgeList *) mallok(sizeof(struct PurgeList));
245 pptr->next = RoomPurgeList;
246 strcpy(pptr->name, qrbuf->QRname);
247 RoomPurgeList = pptr;
254 int PurgeRooms(void) {
255 struct PurgeList *pptr;
256 int num_rooms_purged = 0;
257 struct quickroom qrbuf;
258 struct ValidUser *vuptr;
259 char *transcript = NULL;
261 lprintf(5, "PurgeRooms() called\n");
264 /* Load up a table full of valid user numbers so we can delete
265 * user-owned rooms for users who no longer exist */
266 ForEachUser(AddValidUser, NULL);
268 /* Then cycle through the room file */
269 ForEachRoom(DoPurgeRooms, NULL);
271 /* Free the valid user list */
272 while (ValidUserList != NULL) {
273 vuptr = ValidUserList->next;
274 phree(ValidUserList);
275 ValidUserList = vuptr;
279 transcript = mallok(256);
280 strcpy(transcript, "The following rooms have been auto-purged:\n");
282 while (RoomPurgeList != NULL) {
283 if (getroom(&qrbuf, RoomPurgeList->name) == 0) {
284 transcript=reallok(transcript, strlen(transcript)+256);
285 sprintf(&transcript[strlen(transcript)], " %s\n",
289 pptr = RoomPurgeList->next;
290 phree(RoomPurgeList);
291 RoomPurgeList = pptr;
295 if (num_rooms_purged > 0) aide_message(transcript);
298 lprintf(5, "Purged %d rooms.\n", num_rooms_purged);
299 return(num_rooms_purged);
303 void do_user_purge(struct usersupp *us, void *data) {
307 struct PurgeList *pptr;
309 /* Set purge time; if the user overrides the system default, use it */
310 if (us->USuserpurge > 0) {
311 purge_time = ((time_t)us->USuserpurge) * 86400L;
314 purge_time = ((time_t)config.c_userpurge) * 86400L;
317 /* The default rule is to not purge. */
320 /* If the user hasn't called in two months, his/her account
321 * has expired, so purge the record.
324 if ((now - us->lastcall) > purge_time) purge = 1;
326 /* If the user set his/her password to 'deleteme', he/she
327 * wishes to be deleted, so purge the record.
329 if (!strcasecmp(us->password, "deleteme")) purge = 1;
331 /* If the record is marked as permanent, don't purge it.
333 if (us->flags & US_PERM) purge = 0;
335 /* If the access level is 0, the record should already have been
336 * deleted, but maybe the user was logged in at the time or something.
337 * Delete the record now.
339 if (us->axlevel == 0) purge = 1;
341 /* 0 calls is impossible. If there are 0 calls, it must
342 * be a corrupted record, so purge it.
344 if (us->timescalled == 0) purge = 1;
347 pptr = (struct PurgeList *) mallok(sizeof(struct PurgeList));
348 pptr->next = UserPurgeList;
349 strcpy(pptr->name, us->fullname);
350 UserPurgeList = pptr;
357 int PurgeUsers(void) {
358 struct PurgeList *pptr;
359 int num_users_purged = 0;
360 char *transcript = NULL;
362 lprintf(5, "PurgeUsers() called\n");
363 if (config.c_userpurge > 0) {
364 ForEachUser(do_user_purge, NULL);
367 transcript = mallok(256);
368 strcpy(transcript, "The following users have been auto-purged:\n");
370 while (UserPurgeList != NULL) {
371 transcript=reallok(transcript, strlen(transcript)+256);
372 sprintf(&transcript[strlen(transcript)], " %s\n",
373 UserPurgeList->name);
374 purge_user(UserPurgeList->name);
375 pptr = UserPurgeList->next;
376 phree(UserPurgeList);
377 UserPurgeList = pptr;
381 if (num_users_purged > 0) aide_message(transcript);
384 lprintf(5, "Purged %d users.\n", num_users_purged);
385 return(num_users_purged);
392 * This is a really cumbersome "garbage collection" function. We have to
393 * delete visits which refer to rooms and/or users which no longer exist. In
394 * order to prevent endless traversals of the room and user files, we first
395 * build linked lists of rooms and users which _do_ exist on the system, then
396 * traverse the visit file, checking each record against those two lists and
397 * purging the ones that do not have a match on _both_ lists. (Remember, if
398 * either the room or user being referred to is no longer on the system, the
399 * record is completely useless.)
401 int PurgeVisits(void) {
402 struct cdbdata *cdbvisit;
404 struct VPurgeList *VisitPurgeList = NULL;
405 struct VPurgeList *vptr;
409 struct ValidRoom *vrptr;
410 struct ValidUser *vuptr;
411 int RoomIsValid, UserIsValid;
413 /* First, load up a table full of valid room/gen combinations */
414 ForEachRoom(AddValidRoom, NULL);
416 /* Then load up a table full of valid user numbers */
417 ForEachUser(AddValidUser, NULL);
419 /* Now traverse through the visits, purging irrelevant records... */
420 cdb_rewind(CDB_VISIT);
421 while(cdbvisit = cdb_next_item(CDB_VISIT), cdbvisit != NULL) {
422 memset(&vbuf, 0, sizeof(struct visit));
423 memcpy(&vbuf, cdbvisit->ptr,
424 ( (cdbvisit->len > sizeof(struct visit)) ?
425 sizeof(struct visit) : cdbvisit->len) );
431 /* Check to see if the room exists */
432 for (vrptr=ValidRoomList; vrptr!=NULL; vrptr=vrptr->next) {
433 if ( (vrptr->vr_roomnum==vbuf.v_roomnum)
434 && (vrptr->vr_roomgen==vbuf.v_roomgen))
438 /* Check to see if the user exists */
439 for (vuptr=ValidUserList; vuptr!=NULL; vuptr=vuptr->next) {
440 if (vuptr->vu_usernum == vbuf.v_usernum)
444 /* Put the record on the purge list if it's dead */
445 if ((RoomIsValid==0) || (UserIsValid==0)) {
446 vptr = (struct VPurgeList *)
447 mallok(sizeof(struct VPurgeList));
448 vptr->next = VisitPurgeList;
449 vptr->vp_roomnum = vbuf.v_roomnum;
450 vptr->vp_roomgen = vbuf.v_roomgen;
451 vptr->vp_usernum = vbuf.v_usernum;
452 VisitPurgeList = vptr;
457 /* Free the valid room/gen combination list */
458 while (ValidRoomList != NULL) {
459 vrptr = ValidRoomList->next;
460 phree(ValidRoomList);
461 ValidRoomList = vrptr;
464 /* Free the valid user list */
465 while (ValidUserList != NULL) {
466 vuptr = ValidUserList->next;
467 phree(ValidUserList);
468 ValidUserList = vuptr;
471 /* Now delete every visit on the purged list */
472 while (VisitPurgeList != NULL) {
473 IndexLen = GenerateRelationshipIndex(IndexBuf,
474 VisitPurgeList->vp_roomnum,
475 VisitPurgeList->vp_roomgen,
476 VisitPurgeList->vp_usernum);
477 cdb_delete(CDB_VISIT, IndexBuf, IndexLen);
478 vptr = VisitPurgeList->next;
479 phree(VisitPurgeList);
480 VisitPurgeList = vptr;
488 void cmd_expi(char *argbuf) {
493 if ((!(CC->logged_in))&&(!(CC->internal_pgm))) {
494 cprintf("%d Not logged in.\n",ERROR+NOT_LOGGED_IN);
498 if ((!is_room_aide()) && (!(CC->internal_pgm)) ) {
499 cprintf("%d Higher access required.\n",
500 ERROR+HIGHER_ACCESS_REQUIRED);
504 extract(cmd, argbuf, 0);
505 if (!strcasecmp(cmd, "users")) {
506 retval = PurgeUsers();
507 cprintf("%d Purged %d users.\n", OK, retval);
510 else if (!strcasecmp(cmd, "messages")) {
512 cprintf("%d Expired %d messages.\n", OK, messages_purged);
515 else if (!strcasecmp(cmd, "rooms")) {
516 retval = PurgeRooms();
517 cprintf("%d Expired %d rooms.\n", OK, retval);
520 else if (!strcasecmp(cmd, "visits")) {
521 retval = PurgeVisits();
522 cprintf("%d Purged %d visits.\n", OK, retval);
524 else if (!strcasecmp(cmd, "defrag")) {
526 cprintf("%d Defragmented the databases.\n", OK);
529 cprintf("%d Invalid command.\n", ERROR+ILLEGAL_VALUE);
536 char *Dynamic_Module_Init(void)
538 CtdlRegisterProtoHook(cmd_expi, "EXPI", "Expire old system objects");