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         ev_timer_stop(event_base, &IO->conn_fail);
 133         ev_io_stop(event_base, &IO->conn_event);
 134         ev_idle_stop(event_base, &IO->unwind_stack);
 135
 136         if (IO->SendBuf.fd != 0)
 137         {
 138                 ev_io_stop(event_base, &IO->send_event);
 139                 ev_io_stop(event_base, &IO->recv_event);
 140                 ev_timer_stop (event_base, &IO->rw_timeout);
 141                 close(IO->SendBuf.fd);
 142                 IO->SendBuf.fd = 0;
 143                 IO->RecvBuf.fd = 0;
 144         }
 145         if (IO->DNSChannel != NULL) {
 146                 ares_destroy(IO->DNSChannel);
 147                 ev_io_stop(event_base, &IO->dns_recv_event);
 148                 ev_io_stop(event_base, &IO->dns_send_event);
 149                 IO->DNSChannel = NULL;
 150         }
 151         assert(IO->Terminate);
 152         become_session(IO->CitContext);
 153         IO->Terminate(IO);
 154
 155 }
 156
 157
 158 eReadState HandleInbound(AsyncIO *IO)
 159 {
 160         eReadState Finished = eBufferNotEmpty;
 161
 162         become_session(IO->CitContext);
 163
 164         while ((Finished == eBufferNotEmpty) && (IO->NextState == eReadMessage)){
 165                 if (IO->RecvBuf.nBlobBytesWanted != 0) {
 166
 167                 }
 168                 else { /* Reading lines... */
 169 //// lex line reply in callback, or do it ourselves. as nnn-blabla means continue reading in SMTP
 170                         if (IO->LineReader)
 171                                 Finished = IO->LineReader(IO);
 172                         else
 173                                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 174
 175                         switch (Finished) {
 176                         case eMustReadMore: /// read new from socket...
 177                                 return Finished;
 178                                 break;
 179                         case eBufferNotEmpty: /* shouldn't happen... */
 180                         case eReadSuccess: /// done for now...
 181                                 break;
 182                         case eReadFail: /// WHUT?
 183                                 ///todo: shut down!
 184                                 break;
 185                         }
 186
 187                 }
 188
 189                 if (Finished != eMustReadMore) {
 190                         assert(IO->ReadDone);
 191                         ev_io_stop(event_base, &IO->recv_event);
 192                         IO->NextState = IO->ReadDone(IO);
 193                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 194                 }
 195         }
 196
 197
 198         if ((IO->NextState == eSendReply) ||
 199             (IO->NextState == eSendMore))
 200         {
 201                 assert(IO->SendDone);
 202                 IO->NextState = IO->SendDone(IO);
 203                 ev_io_start(event_base, &IO->send_event);
 204         }
 205         else if ((IO->NextState == eTerminateConnection) ||
 206                  (IO->NextState == eAbort) )
 207                 ShutDownCLient(IO);
 208         return Finished;
 209 }
 210
 211
 212 static void
 213 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 214 {
 215         int rc;
 216         AsyncIO *IO = watcher->data;
 217
 218         become_session(IO->CitContext);
 219         rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 220
 221         if (rc == 0)
 222         {
 223 #ifdef BIGBAD_IODBG
 224                 {
 225                         int rv = 0;
 226                         char fn [SIZ];
 227                         FILE *fd;
 228                         const char *pch = ChrPtr(IO->SendBuf.Buf);
 229                         const char *pchh = IO->SendBuf.ReadWritePointer;
 230                         long nbytes;
 231
 232                         if (pchh == NULL)
 233                                 pchh = pch;
 234
 235                         nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 236                         snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d", "smtpev", IO->SendBuf.fd);
 237
 238                         fd = fopen(fn, "a+");
 239                         fprintf(fd, "Read: BufSize: %ld BufContent: [",
 240                                 nbytes);
 241                         rv = fwrite(pchh, nbytes, 1, fd);
 242                         fprintf(fd, "]\n");
 243
 244
 245                         fclose(fd);
 246                 }
 247 #endif
 248                 ev_io_stop(event_base, &IO->send_event);
 249                 switch (IO->NextState) {
 250                 case eSendReply:
 251                         break;
 252                 case eSendMore:
 253                         assert(IO->SendDone);
 254                         IO->NextState = IO->SendDone(IO);
 255
 256                         if ((IO->NextState == eTerminateConnection) ||
 257                             (IO->NextState == eAbort) )
 258                                 ShutDownCLient(IO);
 259                         else {
 260                                 ev_io_start(event_base, &IO->send_event);
 261                         }
 262                         break;
 263                 case eReadMessage:
 264                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 265                                 HandleInbound(IO);
 266                         }
 267                         else {
 268                                 ev_io_start(event_base, &IO->recv_event);
 269                         }
 270
 271                         break;
 272                 case eTerminateConnection:
 273                 case eAbort:
 274                         break;
 275                 }
 276         }
 277         else if (rc < 0) {
 278                 assert(IO->Timeout);
 279                 IO->Timeout(IO);
 280         }
 281         /* else : must write more. */
 282 }
 283 static void
 284 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 285 {
 286
 287         switch(IO->NextState) {
 288         case eReadMessage:
 289                 ev_io_start(event_base, &IO->recv_event);
 290                 break;
 291         case eSendReply:
 292         case eSendMore:
 293                 become_session(IO->CitContext);
 294                 IO_send_callback(loop, &IO->send_event, revents);
 295                 break;
 296         case eTerminateConnection:
 297         case eAbort:
 298                 /// TODO: WHUT?
 299                 break;
 300         }
 301 }
 302
 303 static void
 304 IO_Timout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 305 {
 306         AsyncIO *IO = watcher->data;
 307
 308         ev_timer_stop (event_base, &IO->rw_timeout);
 309         become_session(IO->CitContext);
 310
 311         assert(IO->Timeout);
 312         switch (IO->Timeout(IO))
 313         {
 314         case eAbort:
 315                 ShutDownCLient(IO);
 316         default:
 317                 break;
 318         }
 319 }
 320 static void
 321 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 322 {
 323         AsyncIO *IO = watcher->data;
 324
 325         ev_timer_stop (event_base, &IO->conn_fail);
 326         ev_io_stop(loop, &IO->conn_event);
 327         become_session(IO->CitContext);
 328
 329         assert(IO->ConnFail);
 330         switch (IO->ConnFail(IO))
 331         {
 332         case eAbort:
 333                 ShutDownCLient(IO);
 334         default:
 335                 break;
 336
 337         }
 338 }
 339 static void
 340 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 341 {
 342         AsyncIO *IO = watcher->data;
 343
 344         ev_io_stop(loop, &IO->conn_event);
 345         ev_timer_stop (event_base, &IO->conn_fail);
 346         set_start_callback(loop, IO, revents);
 347 }
 348 static void
 349 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 350 {
 351         ssize_t nbytes;
 352         AsyncIO *IO = watcher->data;
 353
 354         nbytes = StrBuf_read_one_chunk_callback(watcher->fd, 0 /*TODO */, &IO->RecvBuf);
 355         if (nbytes > 0) {
 356                 HandleInbound(IO);
 357         } else if (nbytes == 0) {
 358                 assert(IO->Timeout);
 359
 360                 switch (IO->Timeout(IO))
 361                 {
 362                 case eAbort:
 363                         ShutDownCLient(IO);
 364                 default:
 365                         break;
 366                 }
 367                 return;
 368         } else if (nbytes == -1) {
 369 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 370                 return;
 371         }
 372 }
 373
 374 void
 375 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 376 {
 377         AsyncIO *IO = watcher->data;
 378         CtdlLogPrintf(CTDL_DEBUG, "event: %s\n", __FUNCTION__);
 379         become_session(IO->CitContext);
 380
 381         IO->DNSQuery->PostDNS(IO);
 382 }
 383
 384 eNextState event_connect_socket(AsyncIO *IO, double conn_timeout, double first_rw_timeout)
 385 {
 386         int fdflags;
 387         int rc = -1;
 388
 389         IO->SendBuf.fd = IO->RecvBuf.fd =
 390                 socket(
 391                         (IO->ConnectMe->IPv6)?PF_INET6:PF_INET,
 392                         SOCK_STREAM,
 393                         IPPROTO_TCP);
 394
 395         if (IO->SendBuf.fd < 0) {
 396                 CtdlLogPrintf(CTDL_ERR, "EVENT: socket() failed: %s\n", strerror(errno));
 397                 StrBufPrintf(IO->ErrMsg, "Failed to create socket: %s", strerror(errno));
 398 //              freeaddrinfo(res);
 399                 return eAbort;
 400         }
 401         fdflags = fcntl(IO->SendBuf.fd, F_GETFL);
 402         if (fdflags < 0) {
 403                 CtdlLogPrintf(CTDL_DEBUG,
 404                               "EVENT: unable to get socket flags! %s \n",
 405                               strerror(errno));
 406                 StrBufPrintf(IO->ErrMsg, "Failed to get socket flags: %s", strerror(errno));
 407                 return eAbort;
 408         }
 409         fdflags = fdflags | O_NONBLOCK;
 410         if (fcntl(IO->SendBuf.fd, F_SETFL, fdflags) < 0) {
 411                 CtdlLogPrintf(CTDL_DEBUG,
 412                               "EVENT: unable to set socket nonblocking flags! %s \n",
 413                               strerror(errno));
 414                 StrBufPrintf(IO->ErrMsg, "Failed to set socket flags: %s", strerror(errno));
 415                 close(IO->SendBuf.fd);
 416                 IO->SendBuf.fd = IO->RecvBuf.fd = -1;
 417                 return eAbort;
 418         }
 419 /* TODO: maye we could use offsetof() to calc the position of data...
 420  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 421  */
 422         ev_io_init(&IO->recv_event, IO_recv_callback, IO->RecvBuf.fd, EV_READ);
 423         IO->recv_event.data = IO;
 424         ev_io_init(&IO->send_event, IO_send_callback, IO->SendBuf.fd, EV_WRITE);
 425         IO->send_event.data = IO;
 426
 427         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 428         IO->conn_fail.data = IO;
 429         ev_timer_init(&IO->rw_timeout, IO_Timout_callback, first_rw_timeout, 0);
 430         IO->rw_timeout.data = IO;
 431
 432         if (IO->ConnectMe->IPv6)
 433                 rc = connect(IO->SendBuf.fd, &IO->ConnectMe->Addr, sizeof(struct sockaddr_in6));
 434         else
 435                 rc = connect(IO->SendBuf.fd, (struct sockaddr_in *)&IO->ConnectMe->Addr, sizeof(struct sockaddr_in));
 436
 437         if (rc >= 0){
 438 ////            freeaddrinfo(res);
 439                 set_start_callback(event_base, IO, 0);
 440                 ev_timer_start(event_base, &IO->rw_timeout);
 441                 return IO->NextState;
 442         }
 443         else if (errno == EINPROGRESS) {
 444
 445                 ev_io_init(&IO->conn_event, IO_connestd_callback, IO->SendBuf.fd, EV_READ|EV_WRITE);
 446                 IO->conn_event.data = IO;
 447
 448                 ev_io_start(event_base, &IO->conn_event);
 449                 ev_timer_start(event_base, &IO->conn_fail);
 450                 return IO->NextState;
 451         }
 452         else {
 453                 CtdlLogPrintf(CTDL_ERR, "connect() failed: %s\n", strerror(errno));
 454                 StrBufPrintf(IO->ErrMsg, "Failed to connect: %s", strerror(errno));
 455                 assert(IO->ConnFail);
 456                 IO->ConnFail(IO);
 457                 return eAbort;
 458         }
 459         return IO->NextState;
 460 }
 461
 462 void SetNextTimeout(AsyncIO *IO, double timeout)
 463 {
 464         IO->rw_timeout.repeat = timeout;
 465         ev_timer_again (event_base,  &IO->rw_timeout);
 466 }
 467
 468 eNextState InitEventIO(AsyncIO *IO,
 469                        void *pData,
 470                        double conn_timeout,
 471                        double first_rw_timeout,
 472                        int ReadFirst)
 473 {
 474         IO->Data = pData;
 475         become_session(IO->CitContext);
 476
 477         if (ReadFirst) {
 478                 IO->NextState = eReadMessage;
 479         }
 480         else {
 481                 IO->NextState = eSendReply;
 482         }
 483         return event_connect_socket(IO, conn_timeout, first_rw_timeout);
 484 }