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
  77 int QueueEventContext(AsyncIO *IO, IO_CallBack CB)
  78 {
  79         IOAddHandler *h;
  80         int i;
  81
  82         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
  83         h->IO = IO;
  84         h->EvAttch = CB;
  85
  86         citthread_mutex_lock(&EventQueueMutex);
  87         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q\n");
  88         i = GetCount(InboundEventQueue);
  89         Put(InboundEventQueue, IKEY(i), h, NULL);
  90         citthread_mutex_unlock(&EventQueueMutex);
  91
  92         ev_async_send (event_base, &AddJob);
  93         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q Done.\n");
  94         return 0;
  95 }
  96
  97
  98 int ShutDownEventQueue(void)
  99 {
 100         citthread_mutex_lock(&EventQueueMutex);
 101         ev_async_send (EV_DEFAULT_ &ExitEventLoop);
 102         citthread_mutex_unlock(&EventQueueMutex);
 103         return 0;
 104 }
 105
 106 void FreeAsyncIOContents(AsyncIO *IO)
 107 {
 108         FreeStrBuf(&IO->IOBuf);
 109         FreeStrBuf(&IO->SendBuf.Buf);
 110         FreeStrBuf(&IO->RecvBuf.Buf);
 111 }
 112
 113
 114 void ShutDownCLient(AsyncIO *IO)
 115 {
 116         CtdlLogPrintf(CTDL_DEBUG, "EVENT x %d\n", IO->sock);
 117
 118         if (IO->sock != 0)
 119         {
 120                 ev_io_stop(event_base, &IO->send_event);
 121                 ev_io_stop(event_base, &IO->recv_event);
 122                 ev_timer_stop (event_base, &IO->rw_timeout);
 123                 close(IO->sock);
 124                 IO->sock = 0;
 125                 IO->SendBuf.fd = 0;
 126                 IO->RecvBuf.fd = 0;
 127         }
 128         if (IO->DNSChannel != NULL) {
 129                 ares_destroy(IO->DNSChannel);
 130                 ev_io_stop(event_base, &IO->dns_recv_event);
 131                 ev_io_stop(event_base, &IO->dns_send_event);
 132                 IO->DNSChannel = NULL;
 133         }
 134         assert(IO->Terminate);
 135         IO->Terminate(IO);
 136
 137 }
 138
 139
 140 eReadState HandleInbound(AsyncIO *IO)
 141 {
 142         eReadState Finished = eBufferNotEmpty;
 143
 144         while ((Finished == eBufferNotEmpty) && (IO->NextState == eReadMessage)){
 145                 if (IO->RecvBuf.nBlobBytesWanted != 0) {
 146
 147                 }
 148                 else { /* Reading lines... */
 149 //// lex line reply in callback, or do it ourselves. as nnn-blabla means continue reading in SMTP
 150                         if (IO->LineReader)
 151                                 Finished = IO->LineReader(IO);
 152                         else
 153                                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 154
 155                         switch (Finished) {
 156                         case eMustReadMore: /// read new from socket...
 157                                 return Finished;
 158                                 break;
 159                         case eBufferNotEmpty: /* shouldn't happen... */
 160                         case eReadSuccess: /// done for now...
 161                                 break;
 162                         case eReadFail: /// WHUT?
 163                                 ///todo: shut down!
 164                                 break;
 165                         }
 166
 167                 }
 168
 169                 if (Finished != eMustReadMore) {
 170                         assert(IO->ReadDone);
 171                         ev_io_stop(event_base, &IO->recv_event);
 172                         IO->NextState = IO->ReadDone(IO);
 173                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 174                 }
 175         }
 176
 177
 178         if ((IO->NextState == eSendReply) ||
 179             (IO->NextState == eSendMore))
 180         {
 181                 assert(IO->SendDone);
 182                 IO->NextState = IO->SendDone(IO);
 183                 ev_io_start(event_base, &IO->send_event);
 184         }
 185         else if ((IO->NextState == eTerminateConnection) ||
 186                  (IO->NextState == eAbort) )
 187                 ShutDownCLient(IO);
 188         return Finished;
 189 }
 190
 191
 192 static void
 193 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 194 {
 195         int rc;
 196         AsyncIO *IO = watcher->data;
 197
 198         rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 199
 200         if (rc == 0)
 201         {
 202 #ifdef BIGBAD_IODBG
 203                 {
 204                         int rv = 0;
 205                         char fn [SIZ];
 206                         FILE *fd;
 207                         const char *pch = ChrPtr(IO->SendBuf.Buf);
 208                         const char *pchh = IO->SendBuf.ReadWritePointer;
 209                         long nbytes;
 210
 211                         if (pchh == NULL)
 212                                 pchh = pch;
 213
 214                         nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 215                         snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d", "smtpev", IO->sock);
 216
 217                         fd = fopen(fn, "a+");
 218                         fprintf(fd, "Read: BufSize: %ld BufContent: [",
 219                                 nbytes);
 220                         rv = fwrite(pchh, nbytes, 1, fd);
 221                         fprintf(fd, "]\n");
 222
 223
 224                         fclose(fd);
 225                 }
 226 #endif
 227                 ev_io_stop(event_base, &IO->send_event);
 228                 switch (IO->NextState) {
 229                 case eSendReply:
 230                         break;
 231                 case eSendMore:
 232                         assert(IO->SendDone);
 233                         IO->NextState = IO->SendDone(IO);
 234
 235                         if ((IO->NextState == eTerminateConnection) ||
 236                             (IO->NextState == eAbort) )
 237                                 ShutDownCLient(IO);
 238                         else {
 239                                 ev_io_start(event_base, &IO->send_event);
 240                         }
 241                         break;
 242                 case eReadMessage:
 243                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 244                                 HandleInbound(IO);
 245                         }
 246                         else {
 247                                 ev_io_start(event_base, &IO->recv_event);
 248                         }
 249
 250                         break;
 251                 case eTerminateConnection:
 252                 case eAbort:
 253                         break;
 254                 }
 255         }
 256         else if (rc < 0) {
 257                 assert(IO->Timeout);
 258                 IO->Timeout(IO);
 259         }
 260         /* else : must write more. */
 261 }
 262 static void
 263 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 264 {
 265
 266         switch(IO->NextState) {
 267         case eReadMessage:
 268                 ev_io_start(event_base, &IO->recv_event);
 269                 break;
 270         case eSendReply:
 271         case eSendMore:
 272                 IO_send_callback(loop, &IO->send_event, revents);
 273                 break;
 274         case eTerminateConnection:
 275         case eAbort:
 276                 /// TODO: WHUT?
 277                 break;
 278         }
 279 }
 280
 281 static void
 282 IO_Timout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 283 {
 284         AsyncIO *IO = watcher->data;
 285
 286         ev_timer_stop (event_base, &IO->rw_timeout);
 287         assert(IO->Timeout);
 288         IO->Timeout(IO);
 289 }
 290 static void
 291 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 292 {
 293         AsyncIO *IO = watcher->data;
 294
 295         ev_timer_stop (event_base, &IO->conn_fail);
 296         ev_io_stop(loop, &IO->conn_event);
 297         assert(IO->ConnFail);
 298         IO->ConnFail(IO);
 299 }
 300 static void
 301 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 302 {
 303         AsyncIO *IO = watcher->data;
 304
 305         ev_io_stop(loop, &IO->conn_event);
 306         ev_timer_stop (event_base, &IO->conn_fail);
 307         set_start_callback(loop, IO, revents);
 308 }
 309 static void
 310 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 311 {
 312         ssize_t nbytes;
 313         AsyncIO *IO = watcher->data;
 314
 315         nbytes = StrBuf_read_one_chunk_callback(watcher->fd, 0 /*TODO */, &IO->RecvBuf);
 316         if (nbytes > 0) {
 317                 HandleInbound(IO);
 318         } else if (nbytes == 0) {
 319                 assert(IO->Timeout);
 320                 IO->Timeout(IO); /* this is a timeout... */
 321                 return;
 322         } else if (nbytes == -1) {
 323 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 324                 return;
 325         }
 326 }
 327
 328 void
 329 IO_postdns_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 330 {
 331         AsyncIO *IO = watcher->data;
 332         CtdlLogPrintf(CTDL_DEBUG, "event: %s\n", __FUNCTION__);
 333
 334         IO->PostDNS(IO);
 335 }
 336
 337 eNextState event_connect_socket(AsyncIO *IO, double conn_timeout, double first_rw_timeout)
 338 {
 339         int fdflags;
 340         int rc = -1;
 341
 342         IO->SendBuf.fd = IO->RecvBuf.fd =
 343                 IO->sock = socket(
 344                         (IO->IP6)?PF_INET6:PF_INET,
 345                         SOCK_STREAM,
 346                         IPPROTO_TCP);
 347
 348         if (IO->sock < 0) {
 349                 CtdlLogPrintf(CTDL_ERR, "EVENT: socket() failed: %s\n", strerror(errno));
 350                 StrBufPrintf(IO->ErrMsg, "Failed to create socket: %s", strerror(errno));
 351 //              freeaddrinfo(res);
 352                 return eAbort;
 353         }
 354         fdflags = fcntl(IO->sock, F_GETFL);
 355         if (fdflags < 0) {
 356                 CtdlLogPrintf(CTDL_DEBUG,
 357                               "EVENT: unable to get socket flags! %s \n",
 358                               strerror(errno));
 359                 StrBufPrintf(IO->ErrMsg, "Failed to get socket flags: %s", strerror(errno));
 360                 return eAbort;
 361         }
 362         fdflags = fdflags | O_NONBLOCK;
 363         if (fcntl(IO->sock, F_SETFL, fdflags) < 0) {
 364                 CtdlLogPrintf(CTDL_DEBUG,
 365                               "EVENT: unable to set socket nonblocking flags! %s \n",
 366                               strerror(errno));
 367                 StrBufPrintf(IO->ErrMsg, "Failed to set socket flags: %s", strerror(errno));
 368                 close(IO->sock);
 369                 return eAbort;
 370         }
 371 /* TODO: maye we could use offsetof() to calc the position of data...
 372  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 373  */
 374         ev_io_init(&IO->recv_event, IO_recv_callback, IO->sock, EV_READ);
 375         IO->recv_event.data = IO;
 376         ev_io_init(&IO->send_event, IO_send_callback, IO->sock, EV_WRITE);
 377         IO->send_event.data = IO;
 378
 379         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 380         IO->conn_fail.data = IO;
 381         ev_timer_init(&IO->rw_timeout, IO_Timout_callback, first_rw_timeout, 0);
 382         IO->rw_timeout.data = IO;
 383
 384         if (IO->IP6)
 385                 rc = connect(IO->sock, &IO->Addr, sizeof(struct sockaddr_in6));
 386         else
 387                 rc = connect(IO->sock, (struct sockaddr_in *)&IO->Addr, sizeof(struct sockaddr_in));
 388
 389         if (rc >= 0){
 390 ////            freeaddrinfo(res);
 391                 set_start_callback(event_base, IO, 0);
 392                 ev_timer_start(event_base, &IO->rw_timeout);
 393                 return IO->NextState;
 394         }
 395         else if (errno == EINPROGRESS) {
 396
 397                 ev_io_init(&IO->conn_event, IO_connestd_callback, IO->sock, EV_READ|EV_WRITE);
 398                 IO->conn_event.data = IO;
 399
 400                 ev_io_start(event_base, &IO->conn_event);
 401                 ev_timer_start(event_base, &IO->conn_fail);
 402                 return IO->NextState;
 403         }
 404         else {
 405                 CtdlLogPrintf(CTDL_ERR, "connect() failed: %s\n", strerror(errno));
 406                 StrBufPrintf(IO->ErrMsg, "Failed to connect: %s", strerror(errno));
 407                 assert(IO->ConnFail);
 408                 IO->ConnFail(IO);
 409                 return eAbort;
 410         }
 411         return IO->NextState;
 412 }
 413
 414 void SetNextTimeout(AsyncIO *IO, double timeout)
 415 {
 416         IO->rw_timeout.repeat = timeout;
 417         ev_timer_again (event_base,  &IO->rw_timeout);
 418 }
 419
 420 eNextState InitEventIO(AsyncIO *IO,
 421                        void *pData,
 422                        double conn_timeout,
 423                        double first_rw_timeout,
 424                        int ReadFirst)
 425 {
 426         IO->Data = pData;
 427
 428         if (ReadFirst) {
 429                 IO->NextState = eReadMessage;
 430         }
 431         else {
 432                 IO->NextState = eSendReply;
 433         }
 434         return event_connect_socket(IO, conn_timeout, first_rw_timeout);
 435 }