citadel/event_client.c

   1 /*
   2  *
   3  * Copyright (c) 1998-2009 by the citadel.org team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #include "sysdep.h"
  21 #include <stdlib.h>
  22 #include <unistd.h>
  23 #include <stdio.h>
  24 #include <termios.h>
  25 #include <fcntl.h>
  26 #include <signal.h>
  27 #include <pwd.h>
  28 #include <errno.h>
  29 #include <sys/types.h>
  30 #include <syslog.h>
  31
  32 #if TIME_WITH_SYS_TIME
  33 # include <sys/time.h>
  34 # include <time.h>
  35 #else
  36 # if HAVE_SYS_TIME_H
  37 #  include <sys/time.h>
  38 # else
  39 #  include <time.h>
  40 # endif
  41 #endif
  42 #include <sys/wait.h>
  43 #include <ctype.h>
  44 #include <string.h>
  45 #include <limits.h>
  46 #include <sys/socket.h>
  47 #include <netinet/in.h>
  48 #include <arpa/inet.h>
  49 #include <assert.h>
  50
  51 #include <libcitadel.h>
  52 #include "citadel.h"
  53 #include "server.h"
  54 #include "citserver.h"
  55 #include "support.h"
  56 #include "config.h"
  57 #include "control.h"
  58 #include "user_ops.h"
  59 #include "database.h"
  60 #include "msgbase.h"
  61 #include "internet_addressing.h"
  62 #include "genstamp.h"
  63 #include "domain.h"
  64 #include "clientsocket.h"
  65 #include "locate_host.h"
  66 #include "citadel_dirs.h"
  67
  68 #include "event_client.h"
  69
  70 extern citthread_mutex_t EventQueueMutex;
  71 extern HashList *InboundEventQueue;
  72 extern struct ev_loop *event_base;
  73 extern ev_async AddJob;
  74 extern ev_async ExitEventLoop;
  75
  76 static void
  77 IO_abort_shutdown_callback(struct ev_loop *loop, ev_cleanup *watcher, int revents)
  78 {
  79         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q: %s\n", __FUNCTION__);
  80
  81         AsyncIO *IO = watcher->data;
  82         IO->ShutdownAbort(IO);
  83 }
  84
  85 int QueueEventContext(AsyncIO *IO, IO_CallBack CB)
  86 {
  87         IOAddHandler *h;
  88         int i;
  89
  90         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
  91         h->IO = IO;
  92         h->EvAttch = CB;
  93         ev_cleanup_init(&IO->abort_by_shutdown,
  94                         IO_abort_shutdown_callback);
  95         IO->abort_by_shutdown.data = IO;
  96         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
  97
  98         citthread_mutex_lock(&EventQueueMutex);
  99         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q\n");
 100         i = GetCount(InboundEventQueue);
 101         Put(InboundEventQueue, IKEY(i), h, NULL);
 102         citthread_mutex_unlock(&EventQueueMutex);
 103
 104         ev_async_send (event_base, &AddJob);
 105         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q Done.\n");
 106         return 0;
 107 }
 108
 109
 110 int ShutDownEventQueue(void)
 111 {
 112         citthread_mutex_lock(&EventQueueMutex);
 113         ev_async_send (EV_DEFAULT_ &ExitEventLoop);
 114         citthread_mutex_unlock(&EventQueueMutex);
 115         return 0;
 116 }
 117
 118 void FreeAsyncIOContents(AsyncIO *IO)
 119 {
 120         FreeStrBuf(&IO->IOBuf);
 121         FreeStrBuf(&IO->SendBuf.Buf);
 122         FreeStrBuf(&IO->RecvBuf.Buf);
 123 }
 124
 125
 126 void StopClientWatchers(AsyncIO *IO)
 127 {
 128         ev_timer_stop(event_base, &IO->conn_fail);
 129         ev_io_stop(event_base, &IO->conn_event);
 130         ev_idle_stop(event_base, &IO->unwind_stack);
 131
 132         if (IO->SendBuf.fd != 0)
 133         {
 134                 ev_io_stop(event_base, &IO->send_event);
 135                 ev_io_stop(event_base, &IO->recv_event);
 136                 ev_timer_stop (event_base, &IO->rw_timeout);
 137                 close(IO->SendBuf.fd);
 138                 IO->SendBuf.fd = 0;
 139                 IO->RecvBuf.fd = 0;
 140         }
 141 }
 142
 143 void ShutDownCLient(AsyncIO *IO)
 144 {
 145         CtdlLogPrintf(CTDL_DEBUG, "EVENT x %d\n", IO->SendBuf.fd);
 146         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 147
 148         StopClientWatchers(IO);
 149
 150         if (IO->DNSChannel != NULL) {
 151                 ares_destroy(IO->DNSChannel);
 152                 ev_io_stop(event_base, &IO->dns_recv_event);
 153                 ev_io_stop(event_base, &IO->dns_send_event);
 154                 IO->DNSChannel = NULL;
 155         }
 156         assert(IO->Terminate);
 157         become_session(IO->CitContext);
 158         IO->Terminate(IO);
 159
 160 }
 161
 162
 163 eReadState HandleInbound(AsyncIO *IO)
 164 {
 165         eReadState Finished = eBufferNotEmpty;
 166
 167         become_session(IO->CitContext);
 168
 169         while ((Finished == eBufferNotEmpty) && (IO->NextState == eReadMessage)){
 170                 if (IO->RecvBuf.nBlobBytesWanted != 0) {
 171
 172                 }
 173                 else { /* Reading lines... */
 174 //// lex line reply in callback, or do it ourselves. as nnn-blabla means continue reading in SMTP
 175                         if (IO->LineReader)
 176                                 Finished = IO->LineReader(IO);
 177                         else
 178                                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 179
 180                         switch (Finished) {
 181                         case eMustReadMore: /// read new from socket...
 182                                 return Finished;
 183                                 break;
 184                         case eBufferNotEmpty: /* shouldn't happen... */
 185                         case eReadSuccess: /// done for now...
 186                                 break;
 187                         case eReadFail: /// WHUT?
 188                                 ///todo: shut down!
 189                                 break;
 190                         }
 191
 192                 }
 193
 194                 if (Finished != eMustReadMore) {
 195                         assert(IO->ReadDone);
 196                         ev_io_stop(event_base, &IO->recv_event);
 197                         IO->NextState = IO->ReadDone(IO);
 198                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 199                 }
 200         }
 201
 202
 203         if ((IO->NextState == eSendReply) ||
 204             (IO->NextState == eSendMore))
 205         {
 206                 assert(IO->SendDone);
 207                 IO->NextState = IO->SendDone(IO);
 208                 ev_io_start(event_base, &IO->send_event);
 209         }
 210         else if ((IO->NextState == eTerminateConnection) ||
 211                  (IO->NextState == eAbort) )
 212                 ShutDownCLient(IO);
 213         return Finished;
 214 }
 215
 216
 217 static void
 218 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 219 {
 220         int rc;
 221         AsyncIO *IO = watcher->data;
 222
 223         become_session(IO->CitContext);
 224         rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 225
 226         if (rc == 0)
 227         {
 228 #ifdef BIGBAD_IODBG
 229                 {
 230                         int rv = 0;
 231                         char fn [SIZ];
 232                         FILE *fd;
 233                         const char *pch = ChrPtr(IO->SendBuf.Buf);
 234                         const char *pchh = IO->SendBuf.ReadWritePointer;
 235                         long nbytes;
 236
 237                         if (pchh == NULL)
 238                                 pchh = pch;
 239
 240                         nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 241                         snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d", "smtpev", IO->SendBuf.fd);
 242
 243                         fd = fopen(fn, "a+");
 244                         fprintf(fd, "Read: BufSize: %ld BufContent: [",
 245                                 nbytes);
 246                         rv = fwrite(pchh, nbytes, 1, fd);
 247                         fprintf(fd, "]\n");
 248
 249
 250                         fclose(fd);
 251                 }
 252 #endif
 253                 ev_io_stop(event_base, &IO->send_event);
 254                 switch (IO->NextState) {
 255                 case eSendReply:
 256                         break;
 257                 case eSendMore:
 258                         assert(IO->SendDone);
 259                         IO->NextState = IO->SendDone(IO);
 260
 261                         if ((IO->NextState == eTerminateConnection) ||
 262                             (IO->NextState == eAbort) )
 263                                 ShutDownCLient(IO);
 264                         else {
 265                                 ev_io_start(event_base, &IO->send_event);
 266                         }
 267                         break;
 268                 case eReadMessage:
 269                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 270                                 HandleInbound(IO);
 271                         }
 272                         else {
 273                                 ev_io_start(event_base, &IO->recv_event);
 274                         }
 275
 276                         break;
 277                 case eSendDNSQuery:
 278                 case eReadDNSReply:
 279                 case eConnect:
 280                 case eTerminateConnection:
 281                 case eAbort:
 282                         break;
 283                 }
 284         }
 285         else if (rc < 0) {
 286                 assert(IO->Timeout);
 287                 IO->Timeout(IO);
 288         }
 289         /* else : must write more. */
 290 }
 291 static void
 292 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 293 {
 294
 295         switch(IO->NextState) {
 296         case eReadMessage:
 297                 ev_io_start(event_base, &IO->recv_event);
 298                 break;
 299         case eSendReply:
 300         case eSendMore:
 301                 become_session(IO->CitContext);
 302                 IO_send_callback(loop, &IO->send_event, revents);
 303                 break;
 304         case eSendDNSQuery:
 305         case eReadDNSReply:
 306         case eConnect:
 307         case eTerminateConnection:
 308         case eAbort:
 309                 /// TODO: WHUT?
 310                 break;
 311         }
 312 }
 313
 314 static void
 315 IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 316 {
 317         AsyncIO *IO = watcher->data;
 318
 319         ev_timer_stop (event_base, &IO->rw_timeout);
 320         become_session(IO->CitContext);
 321
 322         close(IO->SendBuf.fd);
 323         IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 324
 325         assert(IO->Timeout);
 326         switch (IO->Timeout(IO))
 327         {
 328         case eAbort:
 329                 ShutDownCLient(IO);
 330         default:
 331                 break;
 332         }
 333 }
 334 static void
 335 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 336 {
 337         AsyncIO *IO = watcher->data;
 338
 339         ev_timer_stop (event_base, &IO->conn_fail);
 340
 341         ev_io_stop(loop, &IO->conn_event);
 342
 343         close(IO->SendBuf.fd);
 344         IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 345
 346         become_session(IO->CitContext);
 347
 348         assert(IO->ConnFail);
 349         switch (IO->ConnFail(IO))
 350         {
 351         case eAbort:
 352                 ShutDownCLient(IO);
 353         default:
 354                 break;
 355
 356         }
 357 }
 358 static void
 359 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 360 {
 361         AsyncIO *IO = watcher->data;
 362
 363         ev_io_stop(loop, &IO->conn_event);
 364         ev_timer_stop (event_base, &IO->conn_fail);
 365         set_start_callback(loop, IO, revents);
 366 }
 367 static void
 368 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 369 {
 370         ssize_t nbytes;
 371         AsyncIO *IO = watcher->data;
 372
 373         nbytes = StrBuf_read_one_chunk_callback(watcher->fd, 0 /*TODO */, &IO->RecvBuf);
 374         if (nbytes > 0) {
 375                 HandleInbound(IO);
 376         } else if (nbytes == 0) {
 377                 assert(IO->Timeout);
 378
 379                 switch (IO->Timeout(IO))
 380                 {
 381                 case eAbort:
 382                         ShutDownCLient(IO);
 383                 default:
 384                         break;
 385                 }
 386                 return;
 387         } else if (nbytes == -1) {
 388 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 389                 return;
 390         }
 391 }
 392
 393 void
 394 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 395 {
 396         AsyncIO *IO = watcher->data;
 397         CtdlLogPrintf(CTDL_DEBUG, "event: %s\n", __FUNCTION__);
 398         become_session(IO->CitContext);
 399
 400         switch (IO->DNSQuery->PostDNS(IO))
 401         {
 402         case eAbort:
 403             ShutDownCLient(IO);
 404         default:
 405             break;
 406         }
 407 }
 408
 409 eNextState event_connect_socket(AsyncIO *IO, double conn_timeout, double first_rw_timeout)
 410 {
 411         int fdflags;
 412         int rc = -1;
 413
 414         IO->SendBuf.fd = IO->RecvBuf.fd =
 415                 socket(
 416                         (IO->ConnectMe->IPv6)?PF_INET6:PF_INET,
 417                         SOCK_STREAM,
 418                         IPPROTO_TCP);
 419
 420         if (IO->SendBuf.fd < 0) {
 421                 CtdlLogPrintf(CTDL_ERR, "EVENT: socket() failed: %s\n", strerror(errno));
 422                 StrBufPrintf(IO->ErrMsg, "Failed to create socket: %s", strerror(errno));
 423 //              freeaddrinfo(res);
 424                 return eAbort;
 425         }
 426         fdflags = fcntl(IO->SendBuf.fd, F_GETFL);
 427         if (fdflags < 0) {
 428                 CtdlLogPrintf(CTDL_DEBUG,
 429                               "EVENT: unable to get socket flags! %s \n",
 430                               strerror(errno));
 431                 StrBufPrintf(IO->ErrMsg, "Failed to get socket flags: %s", strerror(errno));
 432                 return eAbort;
 433         }
 434         fdflags = fdflags | O_NONBLOCK;
 435         if (fcntl(IO->SendBuf.fd, F_SETFL, fdflags) < 0) {
 436                 CtdlLogPrintf(CTDL_DEBUG,
 437                               "EVENT: unable to set socket nonblocking flags! %s \n",
 438                               strerror(errno));
 439                 StrBufPrintf(IO->ErrMsg, "Failed to set socket flags: %s", strerror(errno));
 440                 close(IO->SendBuf.fd);
 441                 IO->SendBuf.fd = IO->RecvBuf.fd = -1;
 442                 return eAbort;
 443         }
 444 /* TODO: maye we could use offsetof() to calc the position of data...
 445  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 446  */
 447         ev_io_init(&IO->recv_event, IO_recv_callback, IO->RecvBuf.fd, EV_READ);
 448         IO->recv_event.data = IO;
 449         ev_io_init(&IO->send_event, IO_send_callback, IO->SendBuf.fd, EV_WRITE);
 450         IO->send_event.data = IO;
 451
 452         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 453         IO->conn_fail.data = IO;
 454         ev_timer_init(&IO->rw_timeout, IO_Timeout_callback, first_rw_timeout, 0);
 455         IO->rw_timeout.data = IO;
 456
 457         if (IO->ConnectMe->IPv6)
 458                 rc = connect(IO->SendBuf.fd, &IO->ConnectMe->Addr, sizeof(struct sockaddr_in6));
 459         else
 460                 rc = connect(IO->SendBuf.fd, (struct sockaddr_in *)&IO->ConnectMe->Addr, sizeof(struct sockaddr_in));
 461
 462         if (rc >= 0){
 463                 CtdlLogPrintf(CTDL_DEBUG, "connect() immediate success.\n");
 464 ////            freeaddrinfo(res);
 465                 set_start_callback(event_base, IO, 0);
 466                 ev_timer_start(event_base, &IO->rw_timeout);
 467                 return IO->NextState;
 468         }
 469         else if (errno == EINPROGRESS) {
 470                 CtdlLogPrintf(CTDL_DEBUG, "connect() have to wait now.\n");
 471
 472                 ev_io_init(&IO->conn_event, IO_connestd_callback, IO->SendBuf.fd, EV_READ|EV_WRITE);
 473                 IO->conn_event.data = IO;
 474
 475                 ev_io_start(event_base, &IO->conn_event);
 476                 ev_timer_start(event_base, &IO->conn_fail);
 477                 return IO->NextState;
 478         }
 479         else {
 480                 CtdlLogPrintf(CTDL_ERR, "connect() failed: %s\n", strerror(errno));
 481                 StrBufPrintf(IO->ErrMsg, "Failed to connect: %s", strerror(errno));
 482                 assert(IO->ConnFail);
 483                 IO->ConnFail(IO);
 484                 return eAbort;
 485         }
 486         return IO->NextState;
 487 }
 488
 489 void SetNextTimeout(AsyncIO *IO, double timeout)
 490 {
 491         IO->rw_timeout.repeat = timeout;
 492         ev_timer_again (event_base,  &IO->rw_timeout);
 493 }
 494
 495 eNextState InitEventIO(AsyncIO *IO,
 496                        void *pData,
 497                        double conn_timeout,
 498                        double first_rw_timeout,
 499                        int ReadFirst)
 500 {
 501         IO->Data = pData;
 502         become_session(IO->CitContext);
 503
 504         if (ReadFirst) {
 505                 IO->NextState = eReadMessage;
 506         }
 507         else {
 508                 IO->NextState = eSendReply;
 509         }
 510         return event_connect_socket(IO, conn_timeout, first_rw_timeout);
 511 }