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.h>
  69 #include "event_client.h"
  70
  71 extern int event_add_pipe[2];
  72 extern citthread_mutex_t EventQueueMutex;
  73 extern HashList *InboundEventQueue;
  74
  75 #define SEND_EVENT 1
  76 #define RECV_EVENT 2
  77
  78 int QueueEventContext(void *Ctx, AsyncIO *IO, EventContextAttach CB)
  79 {
  80         IOAddHandler *h;
  81         int i;
  82
  83         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
  84         h->Ctx = Ctx;
  85         h->EvAttch = CB;
  86
  87         citthread_mutex_lock(&EventQueueMutex);
  88         if (event_add_pipe[1] == -1) {
  89                 citthread_mutex_unlock(&EventQueueMutex);
  90                 free (h);
  91                 return -1;
  92         }
  93         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q\n");
  94         i = GetCount(InboundEventQueue);
  95         Put(InboundEventQueue, IKEY(i), h, NULL);
  96         citthread_mutex_unlock(&EventQueueMutex);
  97
  98         write(event_add_pipe[1], "+_", 1);
  99         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q Done.\n");
 100         return 0;
 101 }
 102
 103
 104 int ShutDownEventQueue(void)
 105 {
 106         citthread_mutex_lock(&EventQueueMutex);
 107         if (event_add_pipe[1] == -1) {
 108                 citthread_mutex_unlock(&EventQueueMutex);
 109
 110                 return -1;
 111         }
 112         write(event_add_pipe[1], "x_", 1);
 113         close(event_add_pipe[1]);
 114         event_add_pipe[1] = -1;
 115         citthread_mutex_unlock(&EventQueueMutex);
 116         return 0;
 117 }
 118
 119 void FreeAsyncIOContents(AsyncIO *IO)
 120 {
 121         FreeStrBuf(&IO->IOBuf);
 122         FreeStrBuf(&IO->SendBuf.Buf);
 123         FreeStrBuf(&IO->RecvBuf.Buf);
 124
 125 }
 126
 127 /*
 128   static void
 129   setup_signal_handlers(struct instance *instance)
 130   {
 131   signal(SIGPIPE, SIG_IGN);
 132
 133   event_set(&instance->sigterm_event, SIGTERM, EV_SIGNAL|EV_PERSIST,
 134   exit_event_callback, instance);
 135   event_add(&instance->sigterm_event, NULL);
 136
 137   event_set(&instance->sigint_event, SIGINT, EV_SIGNAL|EV_PERSIST,
 138   exit_event_callback, instance);
 139   event_add(&instance->sigint_event, NULL);
 140
 141   event_set(&instance->sigquit_event, SIGQUIT, EV_SIGNAL|EV_PERSIST,
 142   exit_event_callback, instance);
 143   event_add(&instance->sigquit_event, NULL);
 144   }
 145 */
 146
 147 void ShutDownCLient(AsyncIO *IO)
 148 {
 149         CtdlLogPrintf(CTDL_DEBUG, "EVENT x %d\n", IO->sock);
 150         switch (IO->active_event) {
 151         case SEND_EVENT:
 152                 event_del(&IO->send_event);
 153                 break;
 154         case RECV_EVENT:
 155                 event_del(&IO->recv_event);
 156                 break;
 157         case 0:
 158                 // no event active here; just bail out.
 159                 break;
 160         }
 161         IO->active_event = 0;
 162         IO->Terminate(IO->Data);
 163
 164 //      citthread_mutex_lock(&EventQueueMutex);
 165
 166 ///QueueEvents /// todo remove from hash.
 167
 168 //      citthread_mutex_unlock(&EventQueueMutex);
 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                         event_del(&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                 event_add(&IO->send_event, NULL);
 214                 IO->active_event = SEND_EVENT;
 215
 216         }
 217         else if ((IO->NextState == eTerminateConnection) ||
 218                  (IO->NextState == eAbort) )
 219                 ShutDownCLient(IO);
 220         return Finished;
 221 }
 222
 223
 224 static void
 225 IO_send_callback(int fd, short event, void *ctx)
 226 {
 227         int rc;
 228         AsyncIO *IO = ctx;
 229
 230         (void)fd;
 231         (void)event;
 232         CtdlLogPrintf(CTDL_DEBUG, "EVENT -> %d  : [%s%s%s%s]\n",
 233                       (int) fd,
 234                       (event&EV_TIMEOUT) ? " timeout" : "",
 235                       (event&EV_READ)    ? " read" : "",
 236                       (event&EV_WRITE)   ? " write" : "",
 237                       (event&EV_SIGNAL)  ? " signal" : "");
 238
 239 ///    assert(fd == IO->sock);
 240
 241         rc = StrBuf_write_one_chunk_callback(fd, event, &IO->SendBuf);
 242
 243         if (rc == 0)
 244         {
 245
 246 #ifdef BIGBAD_IODBG
 247                 {
 248                         int rv = 0;
 249                         char fn [SIZ];
 250                         FILE *fd;
 251                         const char *pch = ChrPtr(IO->SendBuf.Buf);
 252                         const char *pchh = IO->SendBuf.ReadWritePointer;
 253                         long nbytes;
 254
 255                         if (pchh == NULL)
 256                                 pchh = pch;
 257
 258                         nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 259                         snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d", "smtpev", IO->sock);
 260
 261                         fd = fopen(fn, "a+");
 262                         fprintf(fd, "Read: BufSize: %ld BufContent: [",
 263                                 nbytes);
 264                         rv = fwrite(pchh, nbytes, 1, fd);
 265                         fprintf(fd, "]\n");
 266
 267
 268                         fclose(fd);
 269                 }
 270 #endif
 271                 event_del(&IO->send_event);
 272                 IO->active_event = 0;
 273                 switch (IO->NextState) {
 274                 case eSendReply:
 275                         break;
 276                 case eSendMore:
 277                         IO->NextState = IO->SendDone(IO->Data);
 278
 279                         if ((IO->NextState == eTerminateConnection) ||
 280                             (IO->NextState == eAbort) )
 281                                 ShutDownCLient(IO);
 282                         else {
 283                                 event_add(&IO->send_event, NULL);
 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                                 event_add(&IO->recv_event, NULL);
 293                                 IO->active_event = RECV_EVENT;
 294                         }
 295
 296                         break;
 297                 case eAbort:
 298                         break;
 299                 }
 300         }
 301         else if (rc > 0)
 302                 ShutDownCLient(IO);
 303 //      else
 304                 ///abort!
 305 }
 306
 307
 308 static void
 309 IO_recv_callback(int fd, short event, void *ctx)
 310 {
 311         ssize_t nbytes;
 312         AsyncIO *IO = ctx;
 313
 314 //    assert(fd == IO->sock);
 315
 316 //    assert(fd == sb->fd);
 317
 318         CtdlLogPrintf(CTDL_DEBUG, "EVENT <- %d  : [%s%s%s%s]\n",
 319             (int) fd,
 320             (event&EV_TIMEOUT) ? " timeout" : "",
 321             (event&EV_READ)    ? " read" : "",
 322             (event&EV_WRITE)   ? " write" : "",
 323             (event&EV_SIGNAL)  ? " signal" : "");
 324         nbytes = StrBuf_read_one_chunk_callback(fd, event, &IO->RecvBuf);
 325         if (nbytes > 0) {
 326                 HandleInbound(IO);
 327         } else if (nbytes == 0) {
 328                 ShutDownCLient(IO);
 329 ///  TODO: this is a timeout???  sock_buff_invoke_free(sb, 0); seems as if socket is gone then?
 330                 return;
 331         } else if (nbytes == -1) {
 332 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 333                 return;
 334         }
 335 }
 336
 337 void InitEventIO(AsyncIO *IO,
 338                  void *pData,
 339                  IO_CallBack ReadDone,
 340                  IO_CallBack SendDone,
 341                  IO_CallBack Terminate,
 342                  IO_LineReaderCallback LineReader,
 343                  int ReadFirst)
 344 {
 345         IO->Data = pData;
 346         IO->SendDone = SendDone;
 347         IO->ReadDone = ReadDone;
 348         IO->Terminate = Terminate;
 349         IO->LineReader = LineReader;
 350
 351         event_set(&IO->recv_event,
 352                   IO->sock,
 353                   EV_READ|EV_PERSIST,
 354                   IO_recv_callback,
 355                   IO);
 356
 357         event_set(&IO->send_event,
 358                   IO->sock,
 359                   EV_WRITE|EV_PERSIST,
 360                   IO_send_callback,
 361                   IO);
 362
 363         if (ReadFirst) {
 364                 IO->NextState = eReadMessage;
 365                 event_add(&IO->recv_event, NULL);
 366                 IO->active_event = RECV_EVENT;
 367         }
 368         else {
 369                 IO->NextState = eSendReply;
 370         }
 371 }
 372
 373
 374 #endif