citadel/serv_extensions.c

   1 /*
   2  * $Id$
   3  *
   4  * Citadel Dynamic Loading Module
   5  * Written by Brian Costello <btx@calyx.net>
   6  *
   7  */
   8
   9 #include "sysdep.h"
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <sys/types.h>
  14 #include <dirent.h>
  15 #include <string.h>
  16 #include <limits.h>
  17 #include <ctype.h>
  18 #include "citadel.h"
  19 #include "server.h"
  20 #include "serv_extensions.h"
  21 #include "sysdep_decls.h"
  22 #include "msgbase.h"
  23 #include "tools.h"
  24 #include "config.h"
  25
  26 #ifndef HAVE_SNPRINTF
  27 #include <stdarg.h>
  28 #include "snprintf.h"
  29 #endif
  30
  31 struct LogFunctionHook *LogHookTable = NULL;
  32 struct CleanupFunctionHook *CleanupHookTable = NULL;
  33 struct SessionFunctionHook *SessionHookTable = NULL;
  34 struct UserFunctionHook *UserHookTable = NULL;
  35 struct XmsgFunctionHook *XmsgHookTable = NULL;
  36 struct MessageFunctionHook *MessageHookTable = NULL;
  37 struct NetprocFunctionHook *NetprocHookTable = NULL;
  38 struct DeleteFunctionHook *DeleteHookTable = NULL;
  39 struct ServiceFunctionHook *ServiceHookTable = NULL;
  40
  41 struct ProtoFunctionHook {
  42         void (*handler) (char *cmdbuf);
  43         char *cmd;
  44         char *desc;
  45         struct ProtoFunctionHook *next;
  46 } *ProtoHookList = NULL;
  47
  48 void CtdlRegisterProtoHook(void (*handler) (char *), char *cmd, char *desc)
  49 {
  50         struct ProtoFunctionHook *p;
  51
  52         p = (struct ProtoFunctionHook *)
  53                 malloc(sizeof(struct ProtoFunctionHook));
  54
  55         if (p == NULL) {
  56                 fprintf(stderr, "can't malloc new ProtoFunctionHook\n");
  57                 exit(EXIT_FAILURE);
  58         }
  59         p->handler = handler;
  60         p->cmd = cmd;
  61         p->desc = desc;
  62         p->next = ProtoHookList;
  63         ProtoHookList = p;
  64         lprintf(CTDL_INFO, "Registered server command %s (%s)\n", cmd, desc);
  65 }
  66
  67
  68 void CtdlUnregisterProtoHook(void (*handler) (char *), char *cmd)
  69 {
  70         struct ProtoFunctionHook *cur, *p;
  71
  72         for (cur = ProtoHookList; cur != NULL; cur = cur->next) {
  73                 /* This will also remove duplicates if any */
  74                 while (cur != NULL &&
  75                                 handler == cur->handler &&
  76                                 !strcmp(cmd, cur->cmd)) {
  77                         lprintf(CTDL_INFO, "Unregistered server command %s (%s)\n",
  78                                         cmd, cur->desc);
  79                         p = cur->next;
  80                         if (cur == ProtoHookList) {
  81                                 ProtoHookList = p;
  82                         }
  83                         free(cur);
  84                         cur = p;
  85                 }
  86         }
  87 }
  88
  89
  90 int DLoader_Exec_Cmd(char *cmdbuf)
  91 {
  92         struct ProtoFunctionHook *p;
  93
  94         for (p = ProtoHookList; p; p = p->next) {
  95                 if (!strncasecmp(cmdbuf, p->cmd, 4)) {
  96                         p->handler(&cmdbuf[5]);
  97                         return 1;
  98                 }
  99         }
 100         return 0;
 101 }
 102
 103 void initialize_server_extensions(void)
 104 {
 105         serv_bio_init();
 106         serv_calendar_init();
 107         serv_ldap_init();
 108         serv_chat_init();
 109         serv_expire_init();
 110         serv_imap_init();
 111         serv_inetcfg_init();
 112         serv_listsub_init();
 113         serv_mrtg_init();
 114         serv_netfilter_init();
 115         serv_network_init();
 116         serv_newuser_init();
 117         serv_pas2_init();
 118         serv_pop3_init();
 119         serv_rwho_init();
 120         serv_smtp_init();
 121         serv_spam_init();
 122         /* serv_test_init(); */
 123         serv_upgrade_init();
 124         serv_vandelay_init();
 125         serv_vcard_init();
 126 }
 127
 128
 129
 130 void CtdlRegisterLogHook(void (*fcn_ptr) (char *), int loglevel)
 131 {
 132
 133         struct LogFunctionHook *newfcn;
 134
 135         newfcn = (struct LogFunctionHook *)
 136             malloc(sizeof(struct LogFunctionHook));
 137         newfcn->next = LogHookTable;
 138         newfcn->h_function_pointer = fcn_ptr;
 139         newfcn->loglevel = loglevel;
 140         LogHookTable = newfcn;
 141
 142         lprintf(CTDL_INFO, "Registered a new logging function\n");
 143 }
 144
 145
 146 void CtdlUnregisterLogHook(void (*fcn_ptr) (char *), int loglevel)
 147 {
 148         struct LogFunctionHook *cur, *p;
 149
 150         for (cur = LogHookTable; cur != NULL; cur = cur->next) {
 151                 /* This will also remove duplicates if any */
 152                 while (cur != NULL &&
 153                                 fcn_ptr == cur->h_function_pointer &&
 154                                 loglevel == cur->loglevel) {
 155                         lprintf(CTDL_INFO, "Unregistered logging function\n");
 156                         p = cur->next;
 157                         if (cur == LogHookTable) {
 158                                 LogHookTable = p;
 159                         }
 160                         free(cur);
 161                         cur = p;
 162                 }
 163         }
 164 }
 165
 166
 167 void CtdlRegisterCleanupHook(void (*fcn_ptr) (void))
 168 {
 169
 170         struct CleanupFunctionHook *newfcn;
 171
 172         newfcn = (struct CleanupFunctionHook *)
 173             malloc(sizeof(struct CleanupFunctionHook));
 174         newfcn->next = CleanupHookTable;
 175         newfcn->h_function_pointer = fcn_ptr;
 176         CleanupHookTable = newfcn;
 177
 178         lprintf(CTDL_INFO, "Registered a new cleanup function\n");
 179 }
 180
 181
 182 void CtdlUnregisterCleanupHook(void (*fcn_ptr) (void))
 183 {
 184         struct CleanupFunctionHook *cur, *p;
 185
 186         for (cur = CleanupHookTable; cur != NULL; cur = cur->next) {
 187                 /* This will also remove duplicates if any */
 188                 while (cur != NULL &&
 189                                 fcn_ptr == cur->h_function_pointer) {
 190                         lprintf(CTDL_INFO, "Unregistered cleanup function\n");
 191                         p = cur->next;
 192                         if (cur == CleanupHookTable) {
 193                                 CleanupHookTable = p;
 194                         }
 195                         free(cur);
 196                         cur = p;
 197                 }
 198         }
 199 }
 200
 201
 202 void CtdlRegisterSessionHook(void (*fcn_ptr) (void), int EventType)
 203 {
 204
 205         struct SessionFunctionHook *newfcn;
 206
 207         newfcn = (struct SessionFunctionHook *)
 208             malloc(sizeof(struct SessionFunctionHook));
 209         newfcn->next = SessionHookTable;
 210         newfcn->h_function_pointer = fcn_ptr;
 211         newfcn->eventtype = EventType;
 212         SessionHookTable = newfcn;
 213
 214         lprintf(CTDL_INFO, "Registered a new session function (type %d)\n",
 215                 EventType);
 216 }
 217
 218
 219 void CtdlUnregisterSessionHook(void (*fcn_ptr) (void), int EventType)
 220 {
 221         struct SessionFunctionHook *cur, *p;
 222
 223         for (cur = SessionHookTable; cur != NULL; cur = cur->next) {
 224                 /* This will also remove duplicates if any */
 225                 while (cur != NULL &&
 226                                 fcn_ptr == cur->h_function_pointer &&
 227                                 EventType == cur->eventtype) {
 228                         lprintf(CTDL_INFO, "Unregistered session function (type %d)\n",
 229                                         EventType);
 230                         p = cur->next;
 231                         if (cur == SessionHookTable) {
 232                                 SessionHookTable = p;
 233                         }
 234                         free(cur);
 235                         cur = p;
 236                 }
 237         }
 238 }
 239
 240
 241 void CtdlRegisterUserHook(void (*fcn_ptr) (struct ctdluser *), int EventType)
 242 {
 243
 244         struct UserFunctionHook *newfcn;
 245
 246         newfcn = (struct UserFunctionHook *)
 247             malloc(sizeof(struct UserFunctionHook));
 248         newfcn->next = UserHookTable;
 249         newfcn->h_function_pointer = fcn_ptr;
 250         newfcn->eventtype = EventType;
 251         UserHookTable = newfcn;
 252
 253         lprintf(CTDL_INFO, "Registered a new user function (type %d)\n",
 254                 EventType);
 255 }
 256
 257
 258 void CtdlUnregisterUserHook(void (*fcn_ptr) (struct ctdluser *), int EventType)
 259 {
 260         struct UserFunctionHook *cur, *p;
 261
 262         for (cur = UserHookTable; cur != NULL; cur = cur->next) {
 263                 /* This will also remove duplicates if any */
 264                 while (cur != NULL &&
 265                                 fcn_ptr == cur->h_function_pointer &&
 266                                 EventType == cur->eventtype) {
 267                         lprintf(CTDL_INFO, "Unregistered user function (type %d)\n",
 268                                         EventType);
 269                         p = cur->next;
 270                         if (cur == UserHookTable) {
 271                                 UserHookTable = p;
 272                         }
 273                         free(cur);
 274                         cur = p;
 275                 }
 276         }
 277 }
 278
 279
 280 void CtdlRegisterMessageHook(int (*handler)(struct CtdlMessage *),
 281                                 int EventType)
 282 {
 283
 284         struct MessageFunctionHook *newfcn;
 285
 286         newfcn = (struct MessageFunctionHook *)
 287             malloc(sizeof(struct MessageFunctionHook));
 288         newfcn->next = MessageHookTable;
 289         newfcn->h_function_pointer = handler;
 290         newfcn->eventtype = EventType;
 291         MessageHookTable = newfcn;
 292
 293         lprintf(CTDL_INFO, "Registered a new message function (type %d)\n",
 294                 EventType);
 295 }
 296
 297
 298 void CtdlUnregisterMessageHook(int (*handler)(struct CtdlMessage *),
 299                 int EventType)
 300 {
 301         struct MessageFunctionHook *cur, *p;
 302
 303         for (cur = MessageHookTable; cur != NULL; cur = cur->next) {
 304                 /* This will also remove duplicates if any */
 305                 while (cur != NULL &&
 306                                 handler == cur->h_function_pointer &&
 307                                 EventType == cur->eventtype) {
 308                         lprintf(CTDL_INFO, "Unregistered message function (type %d)\n",
 309                                         EventType);
 310                         p = cur->next;
 311                         if (cur == MessageHookTable) {
 312                                 MessageHookTable = p;
 313                         }
 314                         free(cur);
 315                         cur = p;
 316                 }
 317         }
 318 }
 319
 320
 321 void CtdlRegisterNetprocHook(int (*handler)(struct CtdlMessage *, char *) )
 322 {
 323         struct NetprocFunctionHook *newfcn;
 324
 325         newfcn = (struct NetprocFunctionHook *)
 326             malloc(sizeof(struct NetprocFunctionHook));
 327         newfcn->next = NetprocHookTable;
 328         newfcn->h_function_pointer = handler;
 329         NetprocHookTable = newfcn;
 330
 331         lprintf(CTDL_INFO, "Registered a new netproc function\n");
 332 }
 333
 334
 335 void CtdlUnregisterNetprocHook(int (*handler)(struct CtdlMessage *, char *) )
 336 {
 337         struct NetprocFunctionHook *cur, *p;
 338
 339         for (cur = NetprocHookTable; cur != NULL; cur = cur->next) {
 340                 /* This will also remove duplicates if any */
 341                 while (cur != NULL &&
 342                                 handler == cur->h_function_pointer ) {
 343                         lprintf(CTDL_INFO, "Unregistered netproc function\n");
 344                         p = cur->next;
 345                         if (cur == NetprocHookTable) {
 346                                 NetprocHookTable = p;
 347                         }
 348                         free(cur);
 349                         cur = p;
 350                 }
 351         }
 352 }
 353
 354
 355 void CtdlRegisterDeleteHook(void (*handler)(char *, long) )
 356 {
 357         struct DeleteFunctionHook *newfcn;
 358
 359         newfcn = (struct DeleteFunctionHook *)
 360             malloc(sizeof(struct DeleteFunctionHook));
 361         newfcn->next = DeleteHookTable;
 362         newfcn->h_function_pointer = handler;
 363         DeleteHookTable = newfcn;
 364
 365         lprintf(CTDL_INFO, "Registered a new netproc function\n");
 366 }
 367
 368
 369 void CtdlUnregisterDeleteHook(void (*handler)(char *, long) )
 370 {
 371         struct DeleteFunctionHook *cur, *p;
 372
 373         for (cur = DeleteHookTable; cur != NULL; cur = cur->next) {
 374                 /* This will also remove duplicates if any */
 375                 while (cur != NULL &&
 376                                 handler == cur->h_function_pointer ) {
 377                         lprintf(CTDL_INFO, "Unregistered netproc function\n");
 378                         p = cur->next;
 379                         if (cur == DeleteHookTable) {
 380                                 DeleteHookTable = p;
 381                         }
 382                         free(cur);
 383                         cur = p;
 384                 }
 385         }
 386 }
 387
 388
 389 void CtdlRegisterXmsgHook(int (*fcn_ptr) (char *, char *, char *), int order)
 390 {
 391
 392         struct XmsgFunctionHook *newfcn;
 393
 394         newfcn = (struct XmsgFunctionHook *)
 395             malloc(sizeof(struct XmsgFunctionHook));
 396         newfcn->next = XmsgHookTable;
 397         newfcn->order = order;
 398         newfcn->h_function_pointer = fcn_ptr;
 399         XmsgHookTable = newfcn;
 400         lprintf(CTDL_INFO, "Registered a new x-msg function (priority %d)\n", order);
 401 }
 402
 403
 404 void CtdlUnregisterXmsgHook(int (*fcn_ptr) (char *, char *, char *), int order)
 405 {
 406         struct XmsgFunctionHook *cur, *p;
 407
 408         for (cur = XmsgHookTable; cur != NULL; cur = cur->next) {
 409                 /* This will also remove duplicates if any */
 410                 while (cur != NULL &&
 411                                 fcn_ptr == cur->h_function_pointer &&
 412                                 order == cur->order) {
 413                         lprintf(CTDL_INFO, "Unregistered x-msg function "
 414                                         "(priority %d)\n", order);
 415                         p = cur->next;
 416                         if (cur == XmsgHookTable) {
 417                                 XmsgHookTable = p;
 418                         }
 419                         free(cur);
 420                         cur = p;
 421                 }
 422         }
 423 }
 424
 425
 426 void CtdlRegisterServiceHook(int tcp_port,
 427                         char *sockpath,
 428                         void (*h_greeting_function) (void),
 429                         void (*h_command_function) (void),
 430                         void (*h_async_function) (void)
 431                         )
 432 {
 433         struct ServiceFunctionHook *newfcn;
 434         char message[SIZ];
 435
 436         newfcn = (struct ServiceFunctionHook *)
 437             malloc(sizeof(struct ServiceFunctionHook));
 438         newfcn->next = ServiceHookTable;
 439         newfcn->tcp_port = tcp_port;
 440         newfcn->sockpath = sockpath;
 441         newfcn->h_greeting_function = h_greeting_function;
 442         newfcn->h_command_function = h_command_function;
 443         newfcn->h_async_function = h_async_function;
 444
 445         if (sockpath != NULL) {
 446                 newfcn->msock = ig_uds_server(sockpath, config.c_maxsessions);
 447                 snprintf(message, sizeof message, "Unix domain socket '%s': ", sockpath);
 448         }
 449         else if (tcp_port <= 0) {       /* port -1 to disable */
 450                 lprintf(CTDL_INFO, "Service has been manually disabled, skipping\n");
 451                 free(newfcn);
 452                 return;
 453         }
 454         else {
 455                 newfcn->msock = ig_tcp_server(tcp_port, config.c_maxsessions);
 456                 snprintf(message, sizeof message, "TCP port %d: ", tcp_port);
 457         }
 458
 459         if (newfcn->msock > 0) {
 460                 ServiceHookTable = newfcn;
 461                 strcat(message, "registered.");
 462                 lprintf(CTDL_INFO, "%s\n", message);
 463         }
 464         else {
 465                 strcat(message, "FAILED.");
 466                 lprintf(CTDL_CRIT, "%s\n", message);
 467                 free(newfcn);
 468         }
 469 }
 470
 471
 472 void CtdlUnregisterServiceHook(int tcp_port, char *sockpath,
 473                         void (*h_greeting_function) (void),
 474                         void (*h_command_function) (void),
 475                         void (*h_async_function) (void)
 476                         )
 477 {
 478         struct ServiceFunctionHook *cur, *p;
 479
 480         for (cur = ServiceHookTable; cur != NULL; cur = cur->next) {
 481                 /* This will also remove duplicates if any */
 482                 while (cur != NULL &&
 483                                 !(sockpath && cur->sockpath &&
 484                                         strcmp(sockpath, cur->sockpath)) &&
 485                                 h_greeting_function == cur->h_greeting_function &&
 486                                 h_command_function == cur->h_command_function &&
 487                                 h_async_function == cur->h_async_function &&
 488                                 tcp_port == cur->tcp_port) {
 489                         close(cur->msock);
 490                         if (sockpath) {
 491                                 lprintf(CTDL_INFO, "Closed UNIX domain socket %s\n",
 492                                                 sockpath);
 493                         } else if (tcp_port) {
 494                                 lprintf(CTDL_INFO, "Closed TCP port %d\n", tcp_port);
 495                         } else {
 496                                 lprintf(CTDL_INFO, "Unregistered unknown service\n");
 497                         }
 498                         p = cur->next;
 499                         if (cur == ServiceHookTable) {
 500                                 ServiceHookTable = p;
 501                         }
 502                         free(cur);
 503                         cur = p;
 504                 }
 505         }
 506 }
 507
 508
 509 void PerformSessionHooks(int EventType)
 510 {
 511         struct SessionFunctionHook *fcn;
 512
 513         for (fcn = SessionHookTable; fcn != NULL; fcn = fcn->next) {
 514                 if (fcn->eventtype == EventType) {
 515                         (*fcn->h_function_pointer) ();
 516                 }
 517         }
 518 }
 519
 520 void PerformLogHooks(int loglevel, char *logmsg)
 521 {
 522         struct LogFunctionHook *fcn;
 523
 524         for (fcn = LogHookTable; fcn != NULL; fcn = fcn->next) {
 525                 if (fcn->loglevel >= loglevel) {
 526                         (*fcn->h_function_pointer) (logmsg);
 527                 }
 528         }
 529 }
 530
 531 void PerformUserHooks(struct ctdluser *usbuf, int EventType)
 532 {
 533         struct UserFunctionHook *fcn;
 534
 535         for (fcn = UserHookTable; fcn != NULL; fcn = fcn->next) {
 536                 if (fcn->eventtype == EventType) {
 537                         (*fcn->h_function_pointer) (usbuf);
 538                 }
 539         }
 540 }
 541
 542 int PerformMessageHooks(struct CtdlMessage *msg, int EventType)
 543 {
 544         struct MessageFunctionHook *fcn;
 545         int total_retval = 0;
 546
 547         /* Other code may elect to protect this message from server-side
 548          * handlers; if this is the case, don't do anything.
 549         lprintf(CTDL_DEBUG, "** Event type is %d, flags are %d\n",
 550                 EventType, msg->cm_flags);
 551          */
 552         if (msg->cm_flags & CM_SKIP_HOOKS) {
 553                 lprintf(CTDL_DEBUG, "Skipping hooks\n");
 554                 return(0);
 555         }
 556
 557         /* Otherwise, run all the hooks appropriate to this event type.
 558          */
 559         for (fcn = MessageHookTable; fcn != NULL; fcn = fcn->next) {
 560                 if (fcn->eventtype == EventType) {
 561                         total_retval = total_retval +
 562                                 (*fcn->h_function_pointer) (msg);
 563                 }
 564         }
 565
 566         /* Return the sum of the return codes from the hook functions.  If
 567          * this is an EVT_BEFORESAVE event, a nonzero return code will cause
 568          * the save operation to abort.
 569          */
 570         return total_retval;
 571 }
 572
 573
 574
 575 int PerformNetprocHooks(struct CtdlMessage *msg, char *target_room)
 576 {
 577         struct NetprocFunctionHook *fcn;
 578         int total_retval = 0;
 579
 580         for (fcn = NetprocHookTable; fcn != NULL; fcn = fcn->next) {
 581                 total_retval = total_retval +
 582                         (*fcn->h_function_pointer) (msg, target_room);
 583         }
 584
 585         /* Return the sum of the return codes from the hook functions.
 586          * A nonzero return code will cause the message to *not* be imported.
 587          */
 588         return total_retval;
 589 }
 590
 591
 592 void PerformDeleteHooks(char *room, long msgnum)
 593 {
 594         struct DeleteFunctionHook *fcn;
 595
 596         for (fcn = DeleteHookTable; fcn != NULL; fcn = fcn->next) {
 597                 (*fcn->h_function_pointer) (room, msgnum);
 598         }
 599 }
 600
 601
 602
 603 int PerformXmsgHooks(char *sender, char *recp, char *msg)
 604 {
 605         struct XmsgFunctionHook *fcn;
 606         int total_sent = 0;
 607         int p;
 608
 609         for (p=0; p<MAX_XMSG_PRI; ++p) {
 610                 for (fcn = XmsgHookTable; fcn != NULL; fcn = fcn->next) {
 611                         if (fcn->order == p) {
 612                                 total_sent +=
 613                                         (*fcn->h_function_pointer)
 614                                                 (sender, recp, msg);
 615                         }
 616                 }
 617                 /* Break out of the loop if a higher-priority function
 618                  * successfully delivered the message.  This prevents duplicate
 619                  * deliveries to local users simultaneously signed onto
 620                  * remote services.
 621                  */
 622                 if (total_sent) break;
 623         }
 624         return total_sent;
 625 }