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->sock);
 129
 130         if (IO->sock != 0)
 131         {
 132                 ev_io_stop(event_base, &IO->send_event);
 133                 ev_io_stop(event_base, &IO->recv_event);
 134                 ev_timer_stop (event_base, &IO->rw_timeout);
 135                 close(IO->sock);
 136                 IO->sock = 0;
 137                 IO->SendBuf.fd = 0;
 138                 IO->RecvBuf.fd = 0;
 139         }
 140         if (IO->DNSChannel != NULL) {
 141                 ares_destroy(IO->DNSChannel);
 142                 ev_io_stop(event_base, &IO->dns_recv_event);
 143                 ev_io_stop(event_base, &IO->dns_send_event);
 144                 IO->DNSChannel = NULL;
 145         }
 146         assert(IO->Terminate);
 147         IO->Terminate(IO);
 148
 149 }
 150
 151
 152 eReadState HandleInbound(AsyncIO *IO)
 153 {
 154         eReadState Finished = eBufferNotEmpty;
 155
 156         while ((Finished == eBufferNotEmpty) && (IO->NextState == eReadMessage)){
 157                 if (IO->RecvBuf.nBlobBytesWanted != 0) {
 158
 159                 }
 160                 else { /* Reading lines... */
 161 //// lex line reply in callback, or do it ourselves. as nnn-blabla means continue reading in SMTP
 162                         if (IO->LineReader)
 163                                 Finished = IO->LineReader(IO);
 164                         else
 165                                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 166
 167                         switch (Finished) {
 168                         case eMustReadMore: /// read new from socket...
 169                                 return Finished;
 170                                 break;
 171                         case eBufferNotEmpty: /* shouldn't happen... */
 172                         case eReadSuccess: /// done for now...
 173                                 break;
 174                         case eReadFail: /// WHUT?
 175                                 ///todo: shut down!
 176                                 break;
 177                         }
 178
 179                 }
 180
 181                 if (Finished != eMustReadMore) {
 182                         assert(IO->ReadDone);
 183                         ev_io_stop(event_base, &IO->recv_event);
 184                         IO->NextState = IO->ReadDone(IO);
 185                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 186                 }
 187         }
 188
 189
 190         if ((IO->NextState == eSendReply) ||
 191             (IO->NextState == eSendMore))
 192         {
 193                 assert(IO->SendDone);
 194                 IO->NextState = IO->SendDone(IO);
 195                 ev_io_start(event_base, &IO->send_event);
 196         }
 197         else if ((IO->NextState == eTerminateConnection) ||
 198                  (IO->NextState == eAbort) )
 199                 ShutDownCLient(IO);
 200         return Finished;
 201 }
 202
 203
 204 static void
 205 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 206 {
 207         int rc;
 208         AsyncIO *IO = watcher->data;
 209
 210         rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 211
 212         if (rc == 0)
 213         {
 214 #ifdef BIGBAD_IODBG
 215                 {
 216                         int rv = 0;
 217                         char fn [SIZ];
 218                         FILE *fd;
 219                         const char *pch = ChrPtr(IO->SendBuf.Buf);
 220                         const char *pchh = IO->SendBuf.ReadWritePointer;
 221                         long nbytes;
 222
 223                         if (pchh == NULL)
 224                                 pchh = pch;
 225
 226                         nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 227                         snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d", "smtpev", IO->sock);
 228
 229                         fd = fopen(fn, "a+");
 230                         fprintf(fd, "Read: BufSize: %ld BufContent: [",
 231                                 nbytes);
 232                         rv = fwrite(pchh, nbytes, 1, fd);
 233                         fprintf(fd, "]\n");
 234
 235
 236                         fclose(fd);
 237                 }
 238 #endif
 239                 ev_io_stop(event_base, &IO->send_event);
 240                 switch (IO->NextState) {
 241                 case eSendReply:
 242                         break;
 243                 case eSendMore:
 244                         assert(IO->SendDone);
 245                         IO->NextState = IO->SendDone(IO);
 246
 247                         if ((IO->NextState == eTerminateConnection) ||
 248                             (IO->NextState == eAbort) )
 249                                 ShutDownCLient(IO);
 250                         else {
 251                                 ev_io_start(event_base, &IO->send_event);
 252                         }
 253                         break;
 254                 case eReadMessage:
 255                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 256                                 HandleInbound(IO);
 257                         }
 258                         else {
 259                                 ev_io_start(event_base, &IO->recv_event);
 260                         }
 261
 262                         break;
 263                 case eTerminateConnection:
 264                 case eAbort:
 265                         break;
 266                 }
 267         }
 268         else if (rc < 0) {
 269                 assert(IO->Timeout);
 270                 IO->Timeout(IO);
 271         }
 272         /* else : must write more. */
 273 }
 274 static void
 275 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 276 {
 277
 278         switch(IO->NextState) {
 279         case eReadMessage:
 280                 ev_io_start(event_base, &IO->recv_event);
 281                 break;
 282         case eSendReply:
 283         case eSendMore:
 284                 IO_send_callback(loop, &IO->send_event, revents);
 285                 break;
 286         case eTerminateConnection:
 287         case eAbort:
 288                 /// TODO: WHUT?
 289                 break;
 290         }
 291 }
 292
 293 static void
 294 IO_Timout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 295 {
 296         AsyncIO *IO = watcher->data;
 297
 298         ev_timer_stop (event_base, &IO->rw_timeout);
 299         assert(IO->Timeout);
 300         IO->Timeout(IO);
 301 }
 302 static void
 303 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 304 {
 305         AsyncIO *IO = watcher->data;
 306
 307         ev_timer_stop (event_base, &IO->conn_fail);
 308         ev_io_stop(loop, &IO->conn_event);
 309         assert(IO->ConnFail);
 310         IO->ConnFail(IO);
 311 }
 312 static void
 313 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 314 {
 315         AsyncIO *IO = watcher->data;
 316
 317         ev_io_stop(loop, &IO->conn_event);
 318         ev_timer_stop (event_base, &IO->conn_fail);
 319         set_start_callback(loop, IO, revents);
 320 }
 321 static void
 322 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 323 {
 324         ssize_t nbytes;
 325         AsyncIO *IO = watcher->data;
 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                 assert(IO->Timeout);
 332                 IO->Timeout(IO); /* this is a timeout... */
 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 void
 341 IO_postdns_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 342 {
 343         AsyncIO *IO = watcher->data;
 344         CtdlLogPrintf(CTDL_DEBUG, "event: %s\n", __FUNCTION__);
 345
 346         IO->PostDNS(IO);
 347 }
 348
 349 eNextState event_connect_socket(AsyncIO *IO, double conn_timeout, double first_rw_timeout)
 350 {
 351         int fdflags;
 352         int rc = -1;
 353
 354         IO->SendBuf.fd = IO->RecvBuf.fd =
 355                 IO->sock = socket(
 356                         (IO->IP6)?PF_INET6:PF_INET,
 357                         SOCK_STREAM,
 358                         IPPROTO_TCP);
 359
 360         if (IO->sock < 0) {
 361                 CtdlLogPrintf(CTDL_ERR, "EVENT: socket() failed: %s\n", strerror(errno));
 362                 StrBufPrintf(IO->ErrMsg, "Failed to create socket: %s", strerror(errno));
 363 //              freeaddrinfo(res);
 364                 return eAbort;
 365         }
 366         fdflags = fcntl(IO->sock, F_GETFL);
 367         if (fdflags < 0) {
 368                 CtdlLogPrintf(CTDL_DEBUG,
 369                               "EVENT: unable to get socket flags! %s \n",
 370                               strerror(errno));
 371                 StrBufPrintf(IO->ErrMsg, "Failed to get socket flags: %s", strerror(errno));
 372                 return eAbort;
 373         }
 374         fdflags = fdflags | O_NONBLOCK;
 375         if (fcntl(IO->sock, F_SETFL, fdflags) < 0) {
 376                 CtdlLogPrintf(CTDL_DEBUG,
 377                               "EVENT: unable to set socket nonblocking flags! %s \n",
 378                               strerror(errno));
 379                 StrBufPrintf(IO->ErrMsg, "Failed to set socket flags: %s", strerror(errno));
 380                 close(IO->sock);
 381                 return eAbort;
 382         }
 383 /* TODO: maye we could use offsetof() to calc the position of data...
 384  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 385  */
 386         ev_io_init(&IO->recv_event, IO_recv_callback, IO->sock, EV_READ);
 387         IO->recv_event.data = IO;
 388         ev_io_init(&IO->send_event, IO_send_callback, IO->sock, EV_WRITE);
 389         IO->send_event.data = IO;
 390
 391         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 392         IO->conn_fail.data = IO;
 393         ev_timer_init(&IO->rw_timeout, IO_Timout_callback, first_rw_timeout, 0);
 394         IO->rw_timeout.data = IO;
 395
 396         if (IO->IP6)
 397                 rc = connect(IO->sock, &IO->Addr, sizeof(struct sockaddr_in6));
 398         else
 399                 rc = connect(IO->sock, (struct sockaddr_in *)&IO->Addr, sizeof(struct sockaddr_in));
 400
 401         if (rc >= 0){
 402 ////            freeaddrinfo(res);
 403                 set_start_callback(event_base, IO, 0);
 404                 ev_timer_start(event_base, &IO->rw_timeout);
 405                 return IO->NextState;
 406         }
 407         else if (errno == EINPROGRESS) {
 408
 409                 ev_io_init(&IO->conn_event, IO_connestd_callback, IO->sock, EV_READ|EV_WRITE);
 410                 IO->conn_event.data = IO;
 411
 412                 ev_io_start(event_base, &IO->conn_event);
 413                 ev_timer_start(event_base, &IO->conn_fail);
 414                 return IO->NextState;
 415         }
 416         else {
 417                 CtdlLogPrintf(CTDL_ERR, "connect() failed: %s\n", strerror(errno));
 418                 StrBufPrintf(IO->ErrMsg, "Failed to connect: %s", strerror(errno));
 419                 assert(IO->ConnFail);
 420                 IO->ConnFail(IO);
 421                 return eAbort;
 422         }
 423         return IO->NextState;
 424 }
 425
 426 void SetNextTimeout(AsyncIO *IO, double timeout)
 427 {
 428         IO->rw_timeout.repeat = timeout;
 429         ev_timer_again (event_base,  &IO->rw_timeout);
 430 }
 431
 432 eNextState InitEventIO(AsyncIO *IO,
 433                        void *pData,
 434                        double conn_timeout,
 435                        double first_rw_timeout,
 436                        int ReadFirst)
 437 {
 438         IO->Data = pData;
 439
 440         if (ReadFirst) {
 441                 IO->NextState = eReadMessage;
 442         }
 443         else {
 444                 IO->NextState = eSendReply;
 445         }
 446         return event_connect_socket(IO, conn_timeout, first_rw_timeout);
 447 }