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
  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         ares_destroy(IO->DNSChannel);
 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                 ev_io_stop(event_base, &IO->send_event);
 153                 break;
 154         case RECV_EVENT:
 155                 ev_io_stop(event_base, &IO->recv_event);
 156                 break;
 157         case 0:
 158                 // no event active here; just bail out.
 159                 break;
 160         }
 161
 162         IO->active_event = 0;
 163         IO->Terminate(IO->Data);
 164
 165 }
 166
 167 eReadState HandleInbound(AsyncIO *IO)
 168 {
 169         eReadState Finished = eBufferNotEmpty;
 170
 171         while ((Finished == eBufferNotEmpty) && (IO->NextState == eReadMessage)){
 172                 if (IO->RecvBuf.nBlobBytesWanted != 0) {
 173
 174                 }
 175                 else { /* Reading lines... */
 176 //// lex line reply in callback, or do it ourselves. as nnn-blabla means continue reading in SMTP
 177                         if (IO->LineReader)
 178                                 Finished = IO->LineReader(IO);
 179                         else
 180                                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 181
 182                         switch (Finished) {
 183                         case eMustReadMore: /// read new from socket...
 184                                 return Finished;
 185                                 break;
 186                         case eBufferNotEmpty: /* shouldn't happen... */
 187                         case eReadSuccess: /// done for now...
 188                                 break;
 189                         case eReadFail: /// WHUT?
 190                                 ///todo: shut down!
 191                                 break;
 192                         }
 193
 194                 }
 195
 196                 if (Finished != eMustReadMore) {
 197                         ev_io_stop(event_base, &IO->recv_event);
 198                         IO->active_event = 0;
 199                         IO->NextState = IO->ReadDone(IO->Data);
 200                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 201                 }
 202         }
 203
 204
 205         if ((IO->NextState == eSendReply) ||
 206             (IO->NextState == eSendMore))
 207         {
 208                 IO->NextState = IO->SendDone(IO->Data);
 209                 ev_io_start(event_base, &IO->send_event);
 210
 211                 IO->active_event = SEND_EVENT;
 212
 213         }
 214         else if ((IO->NextState == eTerminateConnection) ||
 215                  (IO->NextState == eAbort) )
 216                 ShutDownCLient(IO);
 217         return Finished;
 218 }
 219
 220
 221 static void
 222 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 223 {
 224         int rc;
 225         AsyncIO *IO = watcher->data;
 226 /*
 227         CtdlLogPrintf(CTDL_DEBUG, "EVENT -> %d  : [%s%s%s%s]\n",
 228                       watcher->fd,
 229                       (event&EV_TIMEOUT) ? " timeout" : "",
 230                       (event&EV_READ)    ? " read" : "",
 231                       (event&EV_WRITE)   ? " write" : "",
 232                       (event&EV_SIGNAL)  ? " signal" : "");
 233 */
 234 ///    assert(fd == IO->sock);
 235
 236         rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 237
 238         if (rc == 0)
 239         {
 240 #ifdef BIGBAD_IODBG
 241                 {
 242                         int rv = 0;
 243                         char fn [SIZ];
 244                         FILE *fd;
 245                         const char *pch = ChrPtr(IO->SendBuf.Buf);
 246                         const char *pchh = IO->SendBuf.ReadWritePointer;
 247                         long nbytes;
 248
 249                         if (pchh == NULL)
 250                                 pchh = pch;
 251
 252                         nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 253                         snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d", "smtpev", IO->sock);
 254
 255                         fd = fopen(fn, "a+");
 256                         fprintf(fd, "Read: BufSize: %ld BufContent: [",
 257                                 nbytes);
 258                         rv = fwrite(pchh, nbytes, 1, fd);
 259                         fprintf(fd, "]\n");
 260
 261
 262                         fclose(fd);
 263                 }
 264 #endif
 265                 ev_io_stop(event_base, &IO->send_event);
 266                 IO->active_event = 0;
 267                 switch (IO->NextState) {
 268                 case eSendReply:
 269                         break;
 270                 case eSendMore:
 271                         IO->NextState = IO->SendDone(IO->Data);
 272
 273                         if ((IO->NextState == eTerminateConnection) ||
 274                             (IO->NextState == eAbort) )
 275                                 ShutDownCLient(IO);
 276                         else {
 277                                 ev_io_start(event_base, &IO->send_event);
 278
 279                                 IO->active_event = SEND_EVENT;
 280                         }
 281                         break;
 282                 case eReadMessage:
 283                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 284                                 HandleInbound(IO);
 285                         }
 286                         else {
 287                                 ev_io_start(event_base, &IO->recv_event);
 288
 289                                 IO->active_event = RECV_EVENT;
 290                         }
 291
 292                         break;
 293                 case eTerminateConnection:
 294                 case eAbort:
 295                         break;
 296                 }
 297         }
 298         else if (rc < 0)
 299                 IO->Timeout(IO);
 300         /* else : must write more. */
 301 }
 302
 303 static void
 304 IO_Timout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 305 {
 306         AsyncIO *IO = watcher->data;
 307
 308         IO->Timeout(IO);
 309 }
 310 static void
 311 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 312 {
 313         AsyncIO *IO = watcher->data;
 314
 315         IO->ConnFail(IO);
 316 }
 317 static void
 318 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 319 {
 320         ssize_t nbytes;
 321         AsyncIO *IO = watcher->data;
 322
 323 //    assert(fd == IO->sock);
 324
 325 //    assert(fd == sb->fd);
 326 /*
 327         CtdlLogPrintf(CTDL_DEBUG, "EVENT <- %d  : [%s%s%s%s]\n",
 328             (int) fd,
 329             (event&EV_TIMEOUT) ? " timeout" : "",
 330             (event&EV_READ)    ? " read" : "",
 331             (event&EV_WRITE)   ? " write" : "",
 332             (event&EV_SIGNAL)  ? " signal" : "");
 333 */
 334         nbytes = StrBuf_read_one_chunk_callback(watcher->fd, 0 /*TODO */, &IO->RecvBuf);
 335         if (nbytes > 0) {
 336                 HandleInbound(IO);
 337         } else if (nbytes == 0) {
 338                 IO->Timeout(IO);
 339 ///  TODO: this is a timeout???  sock_buff_invoke_free(sb, 0); seems as if socket is gone then?
 340                 return;
 341         } else if (nbytes == -1) {
 342 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 343                 return;
 344         }
 345 }
 346
 347
 348 static void
 349 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents, int first_rw_timeout)
 350 {
 351         ev_timer_init(&IO->conn_timeout,
 352                       IO_Timout_callback,
 353                       first_rw_timeout, 0);
 354         IO->conn_timeout.data = IO;
 355
 356         switch(IO->NextState) {
 357         case eReadMessage:
 358                 ev_io_start(event_base, &IO->recv_event);
 359                 IO->active_event = RECV_EVENT;
 360                 break;
 361         case eSendReply:
 362         case eSendMore:
 363                 IO_send_callback(loop, &IO->send_event, revents);
 364                 break;
 365         case eTerminateConnection:
 366         case eAbort:
 367                 /// TODO: WHUT?
 368                 break;
 369         }
 370 }
 371
 372 int event_connect_socket(AsyncIO *IO, int conn_timeout, int first_rw_timeout)
 373 {
 374         struct sockaddr_in  saddr;
 375         int fdflags;
 376         int rc = -1;
 377
 378         IO->SendBuf.fd = IO->RecvBuf.fd =
 379                 IO->sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 380 /*
 381 IO->curr_ai->ai_family,
 382                           IO->curr_ai->ai_socktype,
 383                           IO->curr_ai->ai_protocol);
 384 */
 385         if (IO->sock < 0) {
 386                 CtdlLogPrintf(CTDL_ERR, "EVENT: socket() failed: %s\n", strerror(errno));
 387                 StrBufPrintf(IO->ErrMsg, "Failed to create socket: %s", strerror(errno));
 388 //              freeaddrinfo(res);
 389                 return -1;
 390         }
 391         fdflags = fcntl(IO->sock, F_GETFL);
 392         if (fdflags < 0) {
 393                 CtdlLogPrintf(CTDL_DEBUG,
 394                               "EVENT: unable to get socket flags! %s \n",
 395                               strerror(errno));
 396                 StrBufPrintf(IO->ErrMsg, "Failed to get socket flags: %s", strerror(errno));
 397                 return -1;
 398         }
 399         fdflags = fdflags | O_NONBLOCK;
 400         if (fcntl(IO->sock, F_SETFL, fdflags) < 0) {
 401                 CtdlLogPrintf(CTDL_DEBUG,
 402                               "EVENT: unable to set socket nonblocking flags! %s \n",
 403                               strerror(errno));
 404                 StrBufPrintf(IO->ErrMsg, "Failed to set socket flags: %s", strerror(errno));
 405                 close(IO->sock);
 406                 return -1;
 407         }
 408 /* TODO: maye we could use offsetof() to calc the position of data...
 409  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 410  */
 411         ev_io_init(&IO->recv_event, IO_recv_callback, IO->sock, EV_READ);
 412         IO->recv_event.data = IO;
 413         ev_io_init(&IO->send_event, IO_send_callback, IO->sock, EV_WRITE);
 414         IO->send_event.data = IO;
 415
 416         memset( (struct sockaddr_in *)&saddr, '\0', sizeof( saddr ) );
 417
 418         memcpy(&saddr.sin_addr,
 419                IO->HEnt->h_addr_list[0],
 420                sizeof(struct in_addr));
 421
 422 //      saddr.sin_addr.s_addr = inet_addr("85.88.5.80");
 423         saddr.sin_family = AF_INET;
 424         saddr.sin_port = htons(IO->dport);
 425         rc = connect(IO->sock,
 426                      (struct sockaddr *) &saddr,
 427 /// TODO: ipv6??                     (IO->HEnt->h_addrtype == AF_INET6)?
 428                      /*     sizeof(in6_addr):*/
 429                      sizeof(struct sockaddr_in));
 430         if (rc >= 0){
 431 ////            freeaddrinfo(res);
 432                 set_start_callback(event_base, IO, 0, first_rw_timeout);
 433                 return 0;
 434         }
 435         else if (errno == EINPROGRESS) {
 436                 set_start_callback(event_base, IO, 0, first_rw_timeout);
 437                 ev_timer_init(&IO->conn_fail,
 438                               IO_connfail_callback,
 439                               conn_timeout, 0);
 440                 IO->conn_fail.data = IO;
 441
 442                 return 0;
 443         }
 444         else {
 445                 CtdlLogPrintf(CTDL_ERR, "connect() failed: %s\n", strerror(errno));
 446                 StrBufPrintf(IO->ErrMsg, "Failed to connect: %s", strerror(errno));
 447                 close(IO->sock);
 448 /*              IO->curr_ai = IO->curr_ai->ai_next;
 449                 if (IO->curr_ai != NULL)
 450                         return event_connect_socket(IO);
 451                         else*/
 452                         return -1;
 453         }
 454 }
 455
 456 void InitEventIO(AsyncIO *IO,
 457                  void *pData,
 458                  IO_CallBack ReadDone,
 459                  IO_CallBack SendDone,
 460                  IO_CallBack Terminate,
 461                  IO_CallBack Timeout,
 462                  IO_CallBack ConnFail,
 463                  IO_LineReaderCallback LineReader,
 464                  int conn_timeout,
 465                  int first_rw_timeout,
 466                  int ReadFirst)
 467 {
 468         IO->Data = pData;
 469         IO->SendDone = SendDone;
 470         IO->ReadDone = ReadDone;
 471         IO->Terminate = Terminate;
 472         IO->LineReader = LineReader;
 473
 474         if (ReadFirst) {
 475                 IO->NextState = eReadMessage;
 476         }
 477         else {
 478                 IO->NextState = eSendReply;
 479         }
 480         IO->IP6 = IO->HEnt->h_addrtype == AF_INET6;
 481 //      IO->res = HEnt->h_addr_list[0];
 482         event_connect_socket(IO, conn_timeout, first_rw_timeout);
 483 }
 484
 485
 486 #endif