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 <libcitadel.h>
  50 #include "citadel.h"
  51 #include "server.h"
  52 #include "citserver.h"
  53 #include "support.h"
  54 #include "config.h"
  55 #include "control.h"
  56 #include "user_ops.h"
  57 #include "database.h"
  58 #include "msgbase.h"
  59 #include "internet_addressing.h"
  60 #include "genstamp.h"
  61 #include "domain.h"
  62 #include "clientsocket.h"
  63 #include "locate_host.h"
  64 #include "citadel_dirs.h"
  65
  66 #ifdef EXPERIMENTAL_SMTP_EVENT_CLIENT
  67
  68 #include "event_client.h"
  69
  70 extern int event_add_pipe[2];
  71 extern citthread_mutex_t EventQueueMutex;
  72 extern HashList *InboundEventQueue;
  73 extern struct ev_loop *event_base;
  74
  75 #define SEND_EVENT 1
  76 #define RECV_EVENT 2
  77 #define CONN_EVENT 3
  78
  79 int QueueEventContext(void *Ctx, AsyncIO *IO, EventContextAttach CB)
  80 {
  81         IOAddHandler *h;
  82         int i;
  83
  84         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
  85         h->Ctx = Ctx;
  86         h->EvAttch = CB;
  87
  88         citthread_mutex_lock(&EventQueueMutex);
  89         if (event_add_pipe[1] == -1) {
  90                 citthread_mutex_unlock(&EventQueueMutex);
  91                 free (h);
  92                 return -1;
  93         }
  94         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q\n");
  95         i = GetCount(InboundEventQueue);
  96         Put(InboundEventQueue, IKEY(i), h, NULL);
  97         citthread_mutex_unlock(&EventQueueMutex);
  98
  99         write(event_add_pipe[1], "+_", 1);
 100         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q Done.\n");
 101         return 0;
 102 }
 103
 104
 105 int ShutDownEventQueue(void)
 106 {
 107         citthread_mutex_lock(&EventQueueMutex);
 108         if (event_add_pipe[1] == -1) {
 109                 citthread_mutex_unlock(&EventQueueMutex);
 110
 111                 return -1;
 112         }
 113         write(event_add_pipe[1], "x_", 1);
 114         close(event_add_pipe[1]);
 115         event_add_pipe[1] = -1;
 116         citthread_mutex_unlock(&EventQueueMutex);
 117         return 0;
 118 }
 119
 120 void FreeAsyncIOContents(AsyncIO *IO)
 121 {
 122         FreeStrBuf(&IO->IOBuf);
 123         FreeStrBuf(&IO->SendBuf.Buf);
 124         FreeStrBuf(&IO->RecvBuf.Buf);
 125
 126 }
 127
 128 /*
 129   static void
 130   setup_signal_handlers(struct instance *instance)
 131   {
 132   signal(SIGPIPE, SIG_IGN);
 133
 134   event_set(&instance->sigterm_event, SIGTERM, EV_SIGNAL|EV_PERSIST,
 135   exit_event_callback, instance);
 136   event_add(&instance->sigterm_event, NULL);
 137
 138   event_set(&instance->sigint_event, SIGINT, EV_SIGNAL|EV_PERSIST,
 139   exit_event_callback, instance);
 140   event_add(&instance->sigint_event, NULL);
 141
 142   event_set(&instance->sigquit_event, SIGQUIT, EV_SIGNAL|EV_PERSIST,
 143   exit_event_callback, instance);
 144   event_add(&instance->sigquit_event, NULL);
 145   }
 146 */
 147
 148 void ShutDownCLient(AsyncIO *IO)
 149 {
 150         CtdlLogPrintf(CTDL_DEBUG, "EVENT x %d\n", IO->sock);
 151         switch (IO->active_event) {
 152         case SEND_EVENT:
 153                 ev_io_stop(event_base, &IO->send_event);
 154                 break;
 155         case RECV_EVENT:
 156                 ev_io_stop(event_base, &IO->recv_event);
 157                 break;
 158         case CONN_EVENT:
 159                 ev_io_stop(event_base, &IO->conn_event);
 160                 break;
 161         case 0:
 162                 // no event active here; just bail out.
 163                 break;
 164         }
 165
 166         IO->active_event = 0;
 167         IO->Terminate(IO->Data);
 168
 169 }
 170
 171 eReadState HandleInbound(AsyncIO *IO)
 172 {
 173         eReadState Finished = eBufferNotEmpty;
 174
 175         while ((Finished == eBufferNotEmpty) && (IO->NextState == eReadMessage)){
 176                 if (IO->RecvBuf.nBlobBytesWanted != 0) {
 177
 178                 }
 179                 else { /* Reading lines... */
 180 //// lex line reply in callback, or do it ourselves. as nnn-blabla means continue reading in SMTP
 181                         if (IO->LineReader)
 182                                 Finished = IO->LineReader(IO);
 183                         else
 184                                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 185
 186                         switch (Finished) {
 187                         case eMustReadMore: /// read new from socket...
 188                                 return Finished;
 189                                 break;
 190                         case eBufferNotEmpty: /* shouldn't happen... */
 191                         case eReadSuccess: /// done for now...
 192                                 break;
 193                         case eReadFail: /// WHUT?
 194                                 ///todo: shut down!
 195                                 break;
 196                         }
 197
 198                 }
 199
 200                 if (Finished != eMustReadMore) {
 201                         ev_io_stop(event_base, &IO->recv_event);
 202                         IO->active_event = 0;
 203                         IO->NextState = IO->ReadDone(IO->Data);
 204                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 205                 }
 206         }
 207
 208
 209         if ((IO->NextState == eSendReply) ||
 210             (IO->NextState == eSendMore))
 211         {
 212                 IO->NextState = IO->SendDone(IO->Data);
 213                 ev_io_start(event_base, &IO->send_event);
 214
 215                 IO->active_event = SEND_EVENT;
 216
 217         }
 218         else if ((IO->NextState == eTerminateConnection) ||
 219                  (IO->NextState == eAbort) )
 220                 ShutDownCLient(IO);
 221         return Finished;
 222 }
 223
 224
 225 static void
 226 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 227 {
 228         int rc;
 229         AsyncIO *IO = watcher->data;
 230 /*
 231         CtdlLogPrintf(CTDL_DEBUG, "EVENT -> %d  : [%s%s%s%s]\n",
 232                       watcher->fd,
 233                       (event&EV_TIMEOUT) ? " timeout" : "",
 234                       (event&EV_READ)    ? " read" : "",
 235                       (event&EV_WRITE)   ? " write" : "",
 236                       (event&EV_SIGNAL)  ? " signal" : "");
 237 */
 238 ///    assert(fd == IO->sock);
 239
 240         rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 241
 242         if (rc == 0)
 243         {
 244
 245 #ifdef BIGBAD_IODBG
 246                 {
 247                         int rv = 0;
 248                         char fn [SIZ];
 249                         FILE *fd;
 250                         const char *pch = ChrPtr(IO->SendBuf.Buf);
 251                         const char *pchh = IO->SendBuf.ReadWritePointer;
 252                         long nbytes;
 253
 254                         if (pchh == NULL)
 255                                 pchh = pch;
 256
 257                         nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 258                         snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d", "smtpev", IO->sock);
 259
 260                         fd = fopen(fn, "a+");
 261                         fprintf(fd, "Read: BufSize: %ld BufContent: [",
 262                                 nbytes);
 263                         rv = fwrite(pchh, nbytes, 1, fd);
 264                         fprintf(fd, "]\n");
 265
 266
 267                         fclose(fd);
 268                 }
 269 #endif
 270                 ev_io_stop(event_base, &IO->send_event);
 271                 IO->active_event = 0;
 272                 switch (IO->NextState) {
 273                 case eSendReply:
 274                         break;
 275                 case eSendMore:
 276                         IO->NextState = IO->SendDone(IO->Data);
 277
 278                         if ((IO->NextState == eTerminateConnection) ||
 279                             (IO->NextState == eAbort) )
 280                                 ShutDownCLient(IO);
 281                         else {
 282                                 ev_io_start(event_base, &IO->send_event);
 283
 284                                 IO->active_event = SEND_EVENT;
 285                         }
 286                         break;
 287                 case eReadMessage:
 288                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 289                                 HandleInbound(IO);
 290                         }
 291                         else {
 292                                 ev_io_start(event_base, &IO->recv_event);
 293
 294                                 IO->active_event = RECV_EVENT;
 295                         }
 296
 297                         break;
 298                 case eTerminateConnection:
 299                 case eAbort:
 300                         break;
 301                 }
 302         }
 303         else if (rc > 0)
 304                 ShutDownCLient(IO);
 305 //      else
 306                 ///abort!
 307 }
 308
 309
 310 static void
 311 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 312 {
 313         ssize_t nbytes;
 314         AsyncIO *IO = watcher->data;
 315
 316 //    assert(fd == IO->sock);
 317
 318 //    assert(fd == sb->fd);
 319 /*
 320         CtdlLogPrintf(CTDL_DEBUG, "EVENT <- %d  : [%s%s%s%s]\n",
 321             (int) fd,
 322             (event&EV_TIMEOUT) ? " timeout" : "",
 323             (event&EV_READ)    ? " read" : "",
 324             (event&EV_WRITE)   ? " write" : "",
 325             (event&EV_SIGNAL)  ? " signal" : "");
 326 */
 327         nbytes = StrBuf_read_one_chunk_callback(watcher->fd, 0 /*TODO */, &IO->RecvBuf);
 328         if (nbytes > 0) {
 329                 HandleInbound(IO);
 330         } else if (nbytes == 0) {
 331                 ShutDownCLient(IO);
 332 ///  TODO: this is a timeout???  sock_buff_invoke_free(sb, 0); seems as if socket is gone then?
 333                 return;
 334         } else if (nbytes == -1) {
 335 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 336                 return;
 337         }
 338 }
 339
 340
 341 static void
 342 set_start_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 343 {
 344         AsyncIO *IO = watcher->data;
 345
 346         switch(IO->NextState) {
 347         case eReadMessage:
 348                 ev_io_start(event_base, &IO->recv_event);
 349                 IO->active_event = RECV_EVENT;
 350                 break;
 351         case eSendReply:
 352         case eSendMore:
 353                 IO_send_callback(loop, watcher, revents);
 354                 break;
 355         case eTerminateConnection:
 356         case eAbort:
 357                 /// TODO: WHUT?
 358                 break;
 359         }
 360 }
 361
 362 static void
 363 IO_connect_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 364 {
 365         AsyncIO *IO = watcher->data;
 366
 367         ev_io_stop(event_base, &IO->conn_event);
 368         IO->active_event = 0;
 369         set_start_callback(loop, watcher, revents);
 370 }
 371
 372 int event_connect_socket(AsyncIO *IO)
 373 {
 374         int fdflags;
 375         int rc = -1;
 376
 377         IO->SendBuf.fd =
 378         IO->RecvBuf.fd =
 379         IO->sock = socket(IO->curr_ai->ai_family,
 380                           IO->curr_ai->ai_socktype,
 381                           IO->curr_ai->ai_protocol);
 382
 383         if (IO->sock < 0) {
 384                 CtdlLogPrintf(CTDL_ERR, "EVENT: socket() failed: %s\n", strerror(errno));
 385                 StrBufPrintf(IO->ErrMsg, "Failed to create socket: %s", strerror(errno));
 386 //              freeaddrinfo(res);
 387                 return -1;
 388         }
 389         fdflags = fcntl(IO->sock, F_GETFL);
 390         if (fdflags < 0) {
 391                 CtdlLogPrintf(CTDL_DEBUG,
 392                               "EVENT: unable to get socket flags! %s \n",
 393                               strerror(errno));
 394                 StrBufPrintf(IO->ErrMsg, "Failed to get socket flags: %s", strerror(errno));
 395                 return -1;
 396         }
 397         fdflags = fdflags | O_NONBLOCK;
 398         if (fcntl(IO->sock, F_SETFL, fdflags) < 0) {
 399                 CtdlLogPrintf(CTDL_DEBUG,
 400                               "EVENT: unable to set socket nonblocking flags! %s \n",
 401                               strerror(errno));
 402                 StrBufPrintf(IO->ErrMsg, "Failed to set socket flags: %s", strerror(errno));
 403                 close(IO->sock);
 404                 return -1;
 405         }
 406 /* TODO: maye we could use offsetof() to calc the position of data...
 407  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 408  */
 409         ev_io_init(&IO->recv_event, IO_recv_callback, IO->sock, EV_READ);
 410         IO->recv_event.data = IO;
 411         ev_io_init(&IO->send_event, IO_send_callback, IO->sock, EV_WRITE);
 412         IO->send_event.data = IO;
 413
 414         rc = connect(IO->sock, IO->curr_ai->ai_addr, IO->curr_ai->ai_addrlen);
 415         if (rc >= 0) {
 416 ////            freeaddrinfo(res);
 417                 ev_io_init(&IO->conn_event, IO_send_callback, IO->sock, EV_WRITE);
 418                 IO->conn_event.data = IO;
 419                 set_start_callback(event_base, &IO->conn_event, 0);
 420
 421                 return 0;
 422         }
 423         else if (errno == EINPROGRESS) {
 424                 ev_io_init(&IO->conn_event, IO_connect_callback, IO->sock, EV_READ|EV_WRITE);
 425                 IO->conn_event.data = IO;
 426 /* TODO
 427
 428                 event_set(&IO->conn_event,
 429                           IO->sock,
 430                           EV_READ|EV_WRITE|EV_PERSIST,
 431                           IO_connect_callback,
 432                           IO);
 433 */
 434                 ev_io_start(event_base, &IO->conn_event);
 435
 436                 IO->active_event = CONN_EVENT;
 437                 return 1;
 438         }
 439         else {
 440                 CtdlLogPrintf(CTDL_ERR, "connect() failed: %s\n", strerror(errno));
 441                 StrBufPrintf(IO->ErrMsg, "Failed to connect: %s", strerror(errno));
 442                 close(IO->sock);
 443                 IO->curr_ai = IO->curr_ai->ai_next;
 444                 if (IO->curr_ai != NULL)
 445                         return event_connect_socket(IO);
 446                 else
 447                         return -1;
 448         }
 449 }
 450
 451 void InitEventIO(AsyncIO *IO,
 452                  void *pData,
 453                  IO_CallBack ReadDone,
 454                  IO_CallBack SendDone,
 455                  IO_CallBack Terminate,
 456                  IO_CallBack Timeout,
 457                  IO_CallBack ConnFail,
 458                  IO_CallBack CustomDNS,
 459                  IO_LineReaderCallback LineReader,
 460                  int ReadFirst)
 461 {
 462         IO->Data = pData;
 463         IO->SendDone = SendDone;
 464         IO->ReadDone = ReadDone;
 465         IO->Terminate = Terminate;
 466         IO->LineReader = LineReader;
 467
 468         if (ReadFirst) {
 469                 IO->NextState = eReadMessage;
 470         }
 471         else {
 472                 IO->NextState = eSendReply;
 473         }
 474
 475         event_connect_socket(IO);
 476 }
 477
 478
 479 #endif