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         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 131
 132         if (IO->sock != 0)
 133         {
 134                 ev_io_stop(event_base, &IO->send_event);
 135                 ev_io_stop(event_base, &IO->recv_event);
 136                 ev_timer_stop (event_base, &IO->rw_timeout);
 137                 close(IO->sock);
 138                 IO->sock = 0;
 139                 IO->SendBuf.fd = 0;
 140                 IO->RecvBuf.fd = 0;
 141         }
 142         if (IO->DNSChannel != NULL) {
 143                 ares_destroy(IO->DNSChannel);
 144                 ev_io_stop(event_base, &IO->dns_recv_event);
 145                 ev_io_stop(event_base, &IO->dns_send_event);
 146                 IO->DNSChannel = NULL;
 147         }
 148         assert(IO->Terminate);
 149         IO->Terminate(IO);
 150
 151 }
 152
 153
 154 eReadState HandleInbound(AsyncIO *IO)
 155 {
 156         eReadState Finished = eBufferNotEmpty;
 157
 158         while ((Finished == eBufferNotEmpty) && (IO->NextState == eReadMessage)){
 159                 if (IO->RecvBuf.nBlobBytesWanted != 0) {
 160
 161                 }
 162                 else { /* Reading lines... */
 163 //// lex line reply in callback, or do it ourselves. as nnn-blabla means continue reading in SMTP
 164                         if (IO->LineReader)
 165                                 Finished = IO->LineReader(IO);
 166                         else
 167                                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 168
 169                         switch (Finished) {
 170                         case eMustReadMore: /// read new from socket...
 171                                 return Finished;
 172                                 break;
 173                         case eBufferNotEmpty: /* shouldn't happen... */
 174                         case eReadSuccess: /// done for now...
 175                                 break;
 176                         case eReadFail: /// WHUT?
 177                                 ///todo: shut down!
 178                                 break;
 179                         }
 180
 181                 }
 182
 183                 if (Finished != eMustReadMore) {
 184                         assert(IO->ReadDone);
 185                         ev_io_stop(event_base, &IO->recv_event);
 186                         IO->NextState = IO->ReadDone(IO);
 187                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 188                 }
 189         }
 190
 191
 192         if ((IO->NextState == eSendReply) ||
 193             (IO->NextState == eSendMore))
 194         {
 195                 assert(IO->SendDone);
 196                 IO->NextState = IO->SendDone(IO);
 197                 ev_io_start(event_base, &IO->send_event);
 198         }
 199         else if ((IO->NextState == eTerminateConnection) ||
 200                  (IO->NextState == eAbort) )
 201                 ShutDownCLient(IO);
 202         return Finished;
 203 }
 204
 205
 206 static void
 207 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 208 {
 209         int rc;
 210         AsyncIO *IO = watcher->data;
 211
 212         rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 213
 214         if (rc == 0)
 215         {
 216 #ifdef BIGBAD_IODBG
 217                 {
 218                         int rv = 0;
 219                         char fn [SIZ];
 220                         FILE *fd;
 221                         const char *pch = ChrPtr(IO->SendBuf.Buf);
 222                         const char *pchh = IO->SendBuf.ReadWritePointer;
 223                         long nbytes;
 224
 225                         if (pchh == NULL)
 226                                 pchh = pch;
 227
 228                         nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 229                         snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d", "smtpev", IO->sock);
 230
 231                         fd = fopen(fn, "a+");
 232                         fprintf(fd, "Read: BufSize: %ld BufContent: [",
 233                                 nbytes);
 234                         rv = fwrite(pchh, nbytes, 1, fd);
 235                         fprintf(fd, "]\n");
 236
 237
 238                         fclose(fd);
 239                 }
 240 #endif
 241                 ev_io_stop(event_base, &IO->send_event);
 242                 switch (IO->NextState) {
 243                 case eSendReply:
 244                         break;
 245                 case eSendMore:
 246                         assert(IO->SendDone);
 247                         IO->NextState = IO->SendDone(IO);
 248
 249                         if ((IO->NextState == eTerminateConnection) ||
 250                             (IO->NextState == eAbort) )
 251                                 ShutDownCLient(IO);
 252                         else {
 253                                 ev_io_start(event_base, &IO->send_event);
 254                         }
 255                         break;
 256                 case eReadMessage:
 257                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 258                                 HandleInbound(IO);
 259                         }
 260                         else {
 261                                 ev_io_start(event_base, &IO->recv_event);
 262                         }
 263
 264                         break;
 265                 case eTerminateConnection:
 266                 case eAbort:
 267                         break;
 268                 }
 269         }
 270         else if (rc < 0) {
 271                 assert(IO->Timeout);
 272                 IO->Timeout(IO);
 273         }
 274         /* else : must write more. */
 275 }
 276 static void
 277 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 278 {
 279
 280         switch(IO->NextState) {
 281         case eReadMessage:
 282                 ev_io_start(event_base, &IO->recv_event);
 283                 break;
 284         case eSendReply:
 285         case eSendMore:
 286                 IO_send_callback(loop, &IO->send_event, revents);
 287                 break;
 288         case eTerminateConnection:
 289         case eAbort:
 290                 /// TODO: WHUT?
 291                 break;
 292         }
 293 }
 294
 295 static void
 296 IO_Timout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 297 {
 298         AsyncIO *IO = watcher->data;
 299
 300         ev_timer_stop (event_base, &IO->rw_timeout);
 301         assert(IO->Timeout);
 302         IO->Timeout(IO);
 303 }
 304 static void
 305 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 306 {
 307         AsyncIO *IO = watcher->data;
 308
 309         ev_timer_stop (event_base, &IO->conn_fail);
 310         ev_io_stop(loop, &IO->conn_event);
 311         assert(IO->ConnFail);
 312         IO->ConnFail(IO);
 313 }
 314 static void
 315 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 316 {
 317         AsyncIO *IO = watcher->data;
 318
 319         ev_io_stop(loop, &IO->conn_event);
 320         ev_timer_stop (event_base, &IO->conn_fail);
 321         set_start_callback(loop, IO, revents);
 322 }
 323 static void
 324 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 325 {
 326         ssize_t nbytes;
 327         AsyncIO *IO = watcher->data;
 328
 329         nbytes = StrBuf_read_one_chunk_callback(watcher->fd, 0 /*TODO */, &IO->RecvBuf);
 330         if (nbytes > 0) {
 331                 HandleInbound(IO);
 332         } else if (nbytes == 0) {
 333                 assert(IO->Timeout);
 334                 IO->Timeout(IO); /* this is a timeout... */
 335                 return;
 336         } else if (nbytes == -1) {
 337 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 338                 return;
 339         }
 340 }
 341
 342 void
 343 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 344 {
 345         AsyncIO *IO = watcher->data;
 346         CtdlLogPrintf(CTDL_DEBUG, "event: %s\n", __FUNCTION__);
 347
 348         IO->DNSQuery->PostDNS(IO);
 349 }
 350
 351 eNextState event_connect_socket(AsyncIO *IO, double conn_timeout, double first_rw_timeout)
 352 {
 353         int fdflags;
 354         int rc = -1;
 355
 356         IO->SendBuf.fd = IO->RecvBuf.fd =
 357                 IO->sock = socket(
 358                         (IO->IP6)?PF_INET6:PF_INET,
 359                         SOCK_STREAM,
 360                         IPPROTO_TCP);
 361
 362         if (IO->sock < 0) {
 363                 CtdlLogPrintf(CTDL_ERR, "EVENT: socket() failed: %s\n", strerror(errno));
 364                 StrBufPrintf(IO->ErrMsg, "Failed to create socket: %s", strerror(errno));
 365 //              freeaddrinfo(res);
 366                 return eAbort;
 367         }
 368         fdflags = fcntl(IO->sock, F_GETFL);
 369         if (fdflags < 0) {
 370                 CtdlLogPrintf(CTDL_DEBUG,
 371                               "EVENT: unable to get socket flags! %s \n",
 372                               strerror(errno));
 373                 StrBufPrintf(IO->ErrMsg, "Failed to get socket flags: %s", strerror(errno));
 374                 return eAbort;
 375         }
 376         fdflags = fdflags | O_NONBLOCK;
 377         if (fcntl(IO->sock, F_SETFL, fdflags) < 0) {
 378                 CtdlLogPrintf(CTDL_DEBUG,
 379                               "EVENT: unable to set socket nonblocking flags! %s \n",
 380                               strerror(errno));
 381                 StrBufPrintf(IO->ErrMsg, "Failed to set socket flags: %s", strerror(errno));
 382                 close(IO->sock);
 383                 return eAbort;
 384         }
 385 /* TODO: maye we could use offsetof() to calc the position of data...
 386  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 387  */
 388         ev_io_init(&IO->recv_event, IO_recv_callback, IO->sock, EV_READ);
 389         IO->recv_event.data = IO;
 390         ev_io_init(&IO->send_event, IO_send_callback, IO->sock, EV_WRITE);
 391         IO->send_event.data = IO;
 392
 393         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 394         IO->conn_fail.data = IO;
 395         ev_timer_init(&IO->rw_timeout, IO_Timout_callback, first_rw_timeout, 0);
 396         IO->rw_timeout.data = IO;
 397
 398         if (IO->IP6)
 399                 rc = connect(IO->sock, &IO->Addr, sizeof(struct sockaddr_in6));
 400         else
 401                 rc = connect(IO->sock, (struct sockaddr_in *)&IO->Addr, sizeof(struct sockaddr_in));
 402
 403         if (rc >= 0){
 404 ////            freeaddrinfo(res);
 405                 set_start_callback(event_base, IO, 0);
 406                 ev_timer_start(event_base, &IO->rw_timeout);
 407                 return IO->NextState;
 408         }
 409         else if (errno == EINPROGRESS) {
 410
 411                 ev_io_init(&IO->conn_event, IO_connestd_callback, IO->sock, EV_READ|EV_WRITE);
 412                 IO->conn_event.data = IO;
 413
 414                 ev_io_start(event_base, &IO->conn_event);
 415                 ev_timer_start(event_base, &IO->conn_fail);
 416                 return IO->NextState;
 417         }
 418         else {
 419                 CtdlLogPrintf(CTDL_ERR, "connect() failed: %s\n", strerror(errno));
 420                 StrBufPrintf(IO->ErrMsg, "Failed to connect: %s", strerror(errno));
 421                 assert(IO->ConnFail);
 422                 IO->ConnFail(IO);
 423                 return eAbort;
 424         }
 425         return IO->NextState;
 426 }
 427
 428 void SetNextTimeout(AsyncIO *IO, double timeout)
 429 {
 430         IO->rw_timeout.repeat = timeout;
 431         ev_timer_again (event_base,  &IO->rw_timeout);
 432 }
 433
 434 eNextState InitEventIO(AsyncIO *IO,
 435                        void *pData,
 436                        double conn_timeout,
 437                        double first_rw_timeout,
 438                        int ReadFirst)
 439 {
 440         IO->Data = pData;
 441
 442         if (ReadFirst) {
 443                 IO->NextState = eReadMessage;
 444         }
 445         else {
 446                 IO->NextState = eSendReply;
 447         }
 448         return event_connect_socket(IO, conn_timeout, first_rw_timeout);
 449 }