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 ShutDownCLient(AsyncIO *IO)
 127 {
 128         CtdlLogPrintf(CTDL_DEBUG, "EVENT x %d\n", IO->SendBuf.fd);
 129
 130         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 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         if (IO->DNSChannel != NULL) {
 142                 ares_destroy(IO->DNSChannel);
 143                 ev_io_stop(event_base, &IO->dns_recv_event);
 144                 ev_io_stop(event_base, &IO->dns_send_event);
 145                 IO->DNSChannel = NULL;
 146         }
 147         assert(IO->Terminate);
 148         become_session(IO->CitContext);
 149         IO->Terminate(IO);
 150
 151 }
 152
 153
 154 eReadState HandleInbound(AsyncIO *IO)
 155 {
 156         eReadState Finished = eBufferNotEmpty;
 157
 158         become_session(IO->CitContext);
 159
 160         while ((Finished == eBufferNotEmpty) && (IO->NextState == eReadMessage)){
 161                 if (IO->RecvBuf.nBlobBytesWanted != 0) {
 162
 163                 }
 164                 else { /* Reading lines... */
 165 //// lex line reply in callback, or do it ourselves. as nnn-blabla means continue reading in SMTP
 166                         if (IO->LineReader)
 167                                 Finished = IO->LineReader(IO);
 168                         else
 169                                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 170
 171                         switch (Finished) {
 172                         case eMustReadMore: /// read new from socket...
 173                                 return Finished;
 174                                 break;
 175                         case eBufferNotEmpty: /* shouldn't happen... */
 176                         case eReadSuccess: /// done for now...
 177                                 break;
 178                         case eReadFail: /// WHUT?
 179                                 ///todo: shut down!
 180                                 break;
 181                         }
 182
 183                 }
 184
 185                 if (Finished != eMustReadMore) {
 186                         assert(IO->ReadDone);
 187                         ev_io_stop(event_base, &IO->recv_event);
 188                         IO->NextState = IO->ReadDone(IO);
 189                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 190                 }
 191         }
 192
 193
 194         if ((IO->NextState == eSendReply) ||
 195             (IO->NextState == eSendMore))
 196         {
 197                 assert(IO->SendDone);
 198                 IO->NextState = IO->SendDone(IO);
 199                 ev_io_start(event_base, &IO->send_event);
 200         }
 201         else if ((IO->NextState == eTerminateConnection) ||
 202                  (IO->NextState == eAbort) )
 203                 ShutDownCLient(IO);
 204         return Finished;
 205 }
 206
 207
 208 static void
 209 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 210 {
 211         int rc;
 212         AsyncIO *IO = watcher->data;
 213
 214         become_session(IO->CitContext);
 215         rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 216
 217         if (rc == 0)
 218         {
 219 #ifdef BIGBAD_IODBG
 220                 {
 221                         int rv = 0;
 222                         char fn [SIZ];
 223                         FILE *fd;
 224                         const char *pch = ChrPtr(IO->SendBuf.Buf);
 225                         const char *pchh = IO->SendBuf.ReadWritePointer;
 226                         long nbytes;
 227
 228                         if (pchh == NULL)
 229                                 pchh = pch;
 230
 231                         nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 232                         snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d", "smtpev", IO->SendBuf.fd);
 233
 234                         fd = fopen(fn, "a+");
 235                         fprintf(fd, "Read: BufSize: %ld BufContent: [",
 236                                 nbytes);
 237                         rv = fwrite(pchh, nbytes, 1, fd);
 238                         fprintf(fd, "]\n");
 239
 240
 241                         fclose(fd);
 242                 }
 243 #endif
 244                 ev_io_stop(event_base, &IO->send_event);
 245                 switch (IO->NextState) {
 246                 case eSendReply:
 247                         break;
 248                 case eSendMore:
 249                         assert(IO->SendDone);
 250                         IO->NextState = IO->SendDone(IO);
 251
 252                         if ((IO->NextState == eTerminateConnection) ||
 253                             (IO->NextState == eAbort) )
 254                                 ShutDownCLient(IO);
 255                         else {
 256                                 ev_io_start(event_base, &IO->send_event);
 257                         }
 258                         break;
 259                 case eReadMessage:
 260                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 261                                 HandleInbound(IO);
 262                         }
 263                         else {
 264                                 ev_io_start(event_base, &IO->recv_event);
 265                         }
 266
 267                         break;
 268                 case eTerminateConnection:
 269                 case eAbort:
 270                         break;
 271                 }
 272         }
 273         else if (rc < 0) {
 274                 assert(IO->Timeout);
 275                 IO->Timeout(IO);
 276         }
 277         /* else : must write more. */
 278 }
 279 static void
 280 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 281 {
 282
 283         switch(IO->NextState) {
 284         case eReadMessage:
 285                 ev_io_start(event_base, &IO->recv_event);
 286                 break;
 287         case eSendReply:
 288         case eSendMore:
 289                 become_session(IO->CitContext);
 290                 IO_send_callback(loop, &IO->send_event, revents);
 291                 break;
 292         case eTerminateConnection:
 293         case eAbort:
 294                 /// TODO: WHUT?
 295                 break;
 296         }
 297 }
 298
 299 static void
 300 IO_Timout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 301 {
 302         AsyncIO *IO = watcher->data;
 303
 304         ev_timer_stop (event_base, &IO->rw_timeout);
 305         become_session(IO->CitContext);
 306
 307         assert(IO->Timeout);
 308         IO->Timeout(IO);
 309 }
 310 static void
 311 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 312 {
 313         AsyncIO *IO = watcher->data;
 314
 315         ev_timer_stop (event_base, &IO->conn_fail);
 316         ev_io_stop(loop, &IO->conn_event);
 317         become_session(IO->CitContext);
 318
 319         assert(IO->ConnFail);
 320         IO->ConnFail(IO);
 321 }
 322 static void
 323 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 324 {
 325         AsyncIO *IO = watcher->data;
 326
 327         ev_io_stop(loop, &IO->conn_event);
 328         ev_timer_stop (event_base, &IO->conn_fail);
 329         set_start_callback(loop, IO, revents);
 330 }
 331 static void
 332 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 333 {
 334         ssize_t nbytes;
 335         AsyncIO *IO = watcher->data;
 336
 337         nbytes = StrBuf_read_one_chunk_callback(watcher->fd, 0 /*TODO */, &IO->RecvBuf);
 338         if (nbytes > 0) {
 339                 HandleInbound(IO);
 340         } else if (nbytes == 0) {
 341                 assert(IO->Timeout);
 342                 IO->Timeout(IO); /* this is a timeout... */
 343                 return;
 344         } else if (nbytes == -1) {
 345 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 346                 return;
 347         }
 348 }
 349
 350 void
 351 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 352 {
 353         AsyncIO *IO = watcher->data;
 354         CtdlLogPrintf(CTDL_DEBUG, "event: %s\n", __FUNCTION__);
 355         become_session(IO->CitContext);
 356
 357         IO->DNSQuery->PostDNS(IO);
 358 }
 359
 360 eNextState event_connect_socket(AsyncIO *IO, double conn_timeout, double first_rw_timeout)
 361 {
 362         int fdflags;
 363         int rc = -1;
 364
 365         IO->SendBuf.fd = IO->RecvBuf.fd =
 366                 socket(
 367                         (IO->ConnectMe->IPv6)?PF_INET6:PF_INET,
 368                         SOCK_STREAM,
 369                         IPPROTO_TCP);
 370
 371         if (IO->SendBuf.fd < 0) {
 372                 CtdlLogPrintf(CTDL_ERR, "EVENT: socket() failed: %s\n", strerror(errno));
 373                 StrBufPrintf(IO->ErrMsg, "Failed to create socket: %s", strerror(errno));
 374 //              freeaddrinfo(res);
 375                 return eAbort;
 376         }
 377         fdflags = fcntl(IO->SendBuf.fd, F_GETFL);
 378         if (fdflags < 0) {
 379                 CtdlLogPrintf(CTDL_DEBUG,
 380                               "EVENT: unable to get socket flags! %s \n",
 381                               strerror(errno));
 382                 StrBufPrintf(IO->ErrMsg, "Failed to get socket flags: %s", strerror(errno));
 383                 return eAbort;
 384         }
 385         fdflags = fdflags | O_NONBLOCK;
 386         if (fcntl(IO->SendBuf.fd, F_SETFL, fdflags) < 0) {
 387                 CtdlLogPrintf(CTDL_DEBUG,
 388                               "EVENT: unable to set socket nonblocking flags! %s \n",
 389                               strerror(errno));
 390                 StrBufPrintf(IO->ErrMsg, "Failed to set socket flags: %s", strerror(errno));
 391                 close(IO->SendBuf.fd);
 392                 IO->SendBuf.fd = IO->RecvBuf.fd = -1;
 393                 return eAbort;
 394         }
 395 /* TODO: maye we could use offsetof() to calc the position of data...
 396  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 397  */
 398         ev_io_init(&IO->recv_event, IO_recv_callback, IO->RecvBuf.fd, EV_READ);
 399         IO->recv_event.data = IO;
 400         ev_io_init(&IO->send_event, IO_send_callback, IO->SendBuf.fd, EV_WRITE);
 401         IO->send_event.data = IO;
 402
 403         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 404         IO->conn_fail.data = IO;
 405         ev_timer_init(&IO->rw_timeout, IO_Timout_callback, first_rw_timeout, 0);
 406         IO->rw_timeout.data = IO;
 407
 408         if (IO->ConnectMe->IPv6)
 409                 rc = connect(IO->SendBuf.fd, &IO->ConnectMe->Addr, sizeof(struct sockaddr_in6));
 410         else
 411                 rc = connect(IO->SendBuf.fd, (struct sockaddr_in *)&IO->ConnectMe->Addr, sizeof(struct sockaddr_in));
 412
 413         if (rc >= 0){
 414 ////            freeaddrinfo(res);
 415                 set_start_callback(event_base, IO, 0);
 416                 ev_timer_start(event_base, &IO->rw_timeout);
 417                 return IO->NextState;
 418         }
 419         else if (errno == EINPROGRESS) {
 420
 421                 ev_io_init(&IO->conn_event, IO_connestd_callback, IO->SendBuf.fd, EV_READ|EV_WRITE);
 422                 IO->conn_event.data = IO;
 423
 424                 ev_io_start(event_base, &IO->conn_event);
 425                 ev_timer_start(event_base, &IO->conn_fail);
 426                 return IO->NextState;
 427         }
 428         else {
 429                 CtdlLogPrintf(CTDL_ERR, "connect() failed: %s\n", strerror(errno));
 430                 StrBufPrintf(IO->ErrMsg, "Failed to connect: %s", strerror(errno));
 431                 assert(IO->ConnFail);
 432                 IO->ConnFail(IO);
 433                 return eAbort;
 434         }
 435         return IO->NextState;
 436 }
 437
 438 void SetNextTimeout(AsyncIO *IO, double timeout)
 439 {
 440         IO->rw_timeout.repeat = timeout;
 441         ev_timer_again (event_base,  &IO->rw_timeout);
 442 }
 443
 444 eNextState InitEventIO(AsyncIO *IO,
 445                        void *pData,
 446                        double conn_timeout,
 447                        double first_rw_timeout,
 448                        int ReadFirst)
 449 {
 450         IO->Data = pData;
 451         become_session(IO->CitContext);
 452
 453         if (ReadFirst) {
 454                 IO->NextState = eReadMessage;
 455         }
 456         else {
 457                 IO->NextState = eSendReply;
 458         }
 459         return event_connect_socket(IO, conn_timeout, first_rw_timeout);
 460 }