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         FreeStrBuf(&IO->ErrMsg);
 125         ares_destroy(IO->DNSChannel);
 126
 127 }
 128
 129 /*
 130   static void
 131   setup_signal_handlers(struct instance *instance)
 132   {
 133   signal(SIGPIPE, SIG_IGN);
 134
 135   event_set(&instance->sigterm_event, SIGTERM, EV_SIGNAL|EV_PERSIST,
 136   exit_event_callback, instance);
 137   event_add(&instance->sigterm_event, NULL);
 138
 139   event_set(&instance->sigint_event, SIGINT, EV_SIGNAL|EV_PERSIST,
 140   exit_event_callback, instance);
 141   event_add(&instance->sigint_event, NULL);
 142
 143   event_set(&instance->sigquit_event, SIGQUIT, EV_SIGNAL|EV_PERSIST,
 144   exit_event_callback, instance);
 145   event_add(&instance->sigquit_event, NULL);
 146   }
 147 */
 148
 149 void ShutDownCLient(AsyncIO *IO)
 150 {
 151         CtdlLogPrintf(CTDL_DEBUG, "EVENT x %d\n", IO->sock);
 152         switch (IO->active_event) {
 153         case SEND_EVENT:
 154                 ev_io_stop(event_base, &IO->send_event);
 155                 break;
 156         case RECV_EVENT:
 157                 ev_io_stop(event_base, &IO->recv_event);
 158                 break;
 159         case 0:
 160                 // no event active here; just bail out.
 161                 break;
 162         }
 163
 164         IO->active_event = 0;
 165         IO->Terminate(IO->Data);
 166
 167 }
 168
 169 eReadState HandleInbound(AsyncIO *IO)
 170 {
 171         eReadState Finished = eBufferNotEmpty;
 172
 173         while ((Finished == eBufferNotEmpty) && (IO->NextState == eReadMessage)){
 174                 if (IO->RecvBuf.nBlobBytesWanted != 0) {
 175
 176                 }
 177                 else { /* Reading lines... */
 178 //// lex line reply in callback, or do it ourselves. as nnn-blabla means continue reading in SMTP
 179                         if (IO->LineReader)
 180                                 Finished = IO->LineReader(IO);
 181                         else
 182                                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 183
 184                         switch (Finished) {
 185                         case eMustReadMore: /// read new from socket...
 186                                 return Finished;
 187                                 break;
 188                         case eBufferNotEmpty: /* shouldn't happen... */
 189                         case eReadSuccess: /// done for now...
 190                                 break;
 191                         case eReadFail: /// WHUT?
 192                                 ///todo: shut down!
 193                                 break;
 194                         }
 195
 196                 }
 197
 198                 if (Finished != eMustReadMore) {
 199                         ev_io_stop(event_base, &IO->recv_event);
 200                         IO->active_event = 0;
 201                         IO->NextState = IO->ReadDone(IO->Data);
 202                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 203                 }
 204         }
 205
 206
 207         if ((IO->NextState == eSendReply) ||
 208             (IO->NextState == eSendMore))
 209         {
 210                 IO->NextState = IO->SendDone(IO->Data);
 211                 ev_io_start(event_base, &IO->send_event);
 212
 213                 IO->active_event = SEND_EVENT;
 214
 215         }
 216         else if ((IO->NextState == eTerminateConnection) ||
 217                  (IO->NextState == eAbort) )
 218                 ShutDownCLient(IO);
 219         return Finished;
 220 }
 221
 222
 223 static void
 224 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 225 {
 226         int rc;
 227         AsyncIO *IO = watcher->data;
 228 /*
 229         CtdlLogPrintf(CTDL_DEBUG, "EVENT -> %d  : [%s%s%s%s]\n",
 230                       watcher->fd,
 231                       (event&EV_TIMEOUT) ? " timeout" : "",
 232                       (event&EV_READ)    ? " read" : "",
 233                       (event&EV_WRITE)   ? " write" : "",
 234                       (event&EV_SIGNAL)  ? " signal" : "");
 235 */
 236 ///    assert(fd == IO->sock);
 237
 238         rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 239
 240         if (rc == 0)
 241         {
 242 #ifdef BIGBAD_IODBG
 243                 {
 244                         int rv = 0;
 245                         char fn [SIZ];
 246                         FILE *fd;
 247                         const char *pch = ChrPtr(IO->SendBuf.Buf);
 248                         const char *pchh = IO->SendBuf.ReadWritePointer;
 249                         long nbytes;
 250
 251                         if (pchh == NULL)
 252                                 pchh = pch;
 253
 254                         nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 255                         snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d", "smtpev", IO->sock);
 256
 257                         fd = fopen(fn, "a+");
 258                         fprintf(fd, "Read: BufSize: %ld BufContent: [",
 259                                 nbytes);
 260                         rv = fwrite(pchh, nbytes, 1, fd);
 261                         fprintf(fd, "]\n");
 262
 263
 264                         fclose(fd);
 265                 }
 266 #endif
 267                 ev_io_stop(event_base, &IO->send_event);
 268                 IO->active_event = 0;
 269                 switch (IO->NextState) {
 270                 case eSendReply:
 271                         break;
 272                 case eSendMore:
 273                         IO->NextState = IO->SendDone(IO->Data);
 274
 275                         if ((IO->NextState == eTerminateConnection) ||
 276                             (IO->NextState == eAbort) )
 277                                 ShutDownCLient(IO);
 278                         else {
 279                                 ev_io_start(event_base, &IO->send_event);
 280
 281                                 IO->active_event = SEND_EVENT;
 282                         }
 283                         break;
 284                 case eReadMessage:
 285                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 286                                 HandleInbound(IO);
 287                         }
 288                         else {
 289                                 ev_io_start(event_base, &IO->recv_event);
 290
 291                                 IO->active_event = RECV_EVENT;
 292                         }
 293
 294                         break;
 295                 case eTerminateConnection:
 296                 case eAbort:
 297                         break;
 298                 }
 299         }
 300         else if (rc < 0)
 301                 IO->Timeout(IO);
 302         /* else : must write more. */
 303 }
 304
 305 static void
 306 IO_Timout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 307 {
 308         AsyncIO *IO = watcher->data;
 309
 310         IO->Timeout(IO);
 311 }
 312 static void
 313 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 314 {
 315         AsyncIO *IO = watcher->data;
 316
 317         IO->ConnFail(IO);
 318 }
 319 static void
 320 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 321 {
 322         ssize_t nbytes;
 323         AsyncIO *IO = watcher->data;
 324
 325 //    assert(fd == IO->sock);
 326
 327 //    assert(fd == sb->fd);
 328 /*
 329         CtdlLogPrintf(CTDL_DEBUG, "EVENT <- %d  : [%s%s%s%s]\n",
 330             (int) fd,
 331             (event&EV_TIMEOUT) ? " timeout" : "",
 332             (event&EV_READ)    ? " read" : "",
 333             (event&EV_WRITE)   ? " write" : "",
 334             (event&EV_SIGNAL)  ? " signal" : "");
 335 */
 336         nbytes = StrBuf_read_one_chunk_callback(watcher->fd, 0 /*TODO */, &IO->RecvBuf);
 337         if (nbytes > 0) {
 338                 HandleInbound(IO);
 339         } else if (nbytes == 0) {
 340                 IO->Timeout(IO);
 341 ///  TODO: this is a timeout???  sock_buff_invoke_free(sb, 0); seems as if socket is gone then?
 342                 return;
 343         } else if (nbytes == -1) {
 344 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 345                 return;
 346         }
 347 }
 348
 349
 350 static void
 351 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents, int first_rw_timeout)
 352 {
 353         ev_timer_init(&IO->conn_timeout,
 354                       IO_Timout_callback,
 355                       first_rw_timeout, 0);
 356         IO->conn_timeout.data = IO;
 357
 358         switch(IO->NextState) {
 359         case eReadMessage:
 360                 ev_io_start(event_base, &IO->recv_event);
 361                 IO->active_event = RECV_EVENT;
 362                 break;
 363         case eSendReply:
 364         case eSendMore:
 365                 IO_send_callback(loop, &IO->send_event, revents);
 366                 break;
 367         case eTerminateConnection:
 368         case eAbort:
 369                 /// TODO: WHUT?
 370                 break;
 371         }
 372 }
 373
 374 int event_connect_socket(AsyncIO *IO, int conn_timeout, int first_rw_timeout)
 375 {
 376         struct sockaddr_in  saddr;
 377         int fdflags;
 378         int rc = -1;
 379
 380         IO->SendBuf.fd = IO->RecvBuf.fd =
 381                 IO->sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 382 /*
 383 IO->curr_ai->ai_family,
 384                           IO->curr_ai->ai_socktype,
 385                           IO->curr_ai->ai_protocol);
 386 */
 387         if (IO->sock < 0) {
 388                 CtdlLogPrintf(CTDL_ERR, "EVENT: socket() failed: %s\n", strerror(errno));
 389                 StrBufPrintf(IO->ErrMsg, "Failed to create socket: %s", strerror(errno));
 390 //              freeaddrinfo(res);
 391                 return -1;
 392         }
 393         fdflags = fcntl(IO->sock, F_GETFL);
 394         if (fdflags < 0) {
 395                 CtdlLogPrintf(CTDL_DEBUG,
 396                               "EVENT: unable to get socket flags! %s \n",
 397                               strerror(errno));
 398                 StrBufPrintf(IO->ErrMsg, "Failed to get socket flags: %s", strerror(errno));
 399                 return -1;
 400         }
 401         fdflags = fdflags | O_NONBLOCK;
 402         if (fcntl(IO->sock, F_SETFL, fdflags) < 0) {
 403                 CtdlLogPrintf(CTDL_DEBUG,
 404                               "EVENT: unable to set socket nonblocking flags! %s \n",
 405                               strerror(errno));
 406                 StrBufPrintf(IO->ErrMsg, "Failed to set socket flags: %s", strerror(errno));
 407                 close(IO->sock);
 408                 return -1;
 409         }
 410 /* TODO: maye we could use offsetof() to calc the position of data...
 411  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 412  */
 413         ev_io_init(&IO->recv_event, IO_recv_callback, IO->sock, EV_READ);
 414         IO->recv_event.data = IO;
 415         ev_io_init(&IO->send_event, IO_send_callback, IO->sock, EV_WRITE);
 416         IO->send_event.data = IO;
 417
 418         memset( (struct sockaddr_in *)&saddr, '\0', sizeof( saddr ) );
 419
 420         memcpy(&saddr.sin_addr,
 421                IO->HEnt->h_addr_list[0],
 422                sizeof(struct in_addr));
 423
 424 //      saddr.sin_addr.s_addr = inet_addr("85.88.5.80");
 425         saddr.sin_family = AF_INET;
 426         saddr.sin_port = htons(IO->dport);
 427         rc = connect(IO->sock,
 428                      (struct sockaddr *) &saddr,
 429 /// TODO: ipv6??                     (IO->HEnt->h_addrtype == AF_INET6)?
 430                      /*     sizeof(in6_addr):*/
 431                      sizeof(struct sockaddr_in));
 432         if (rc >= 0){
 433 ////            freeaddrinfo(res);
 434                 set_start_callback(event_base, IO, 0, first_rw_timeout);
 435                 return 0;
 436         }
 437         else if (errno == EINPROGRESS) {
 438                 set_start_callback(event_base, IO, 0, first_rw_timeout);
 439                 ev_timer_init(&IO->conn_fail,
 440                               IO_connfail_callback,
 441                               conn_timeout, 0);
 442                 IO->conn_fail.data = IO;
 443
 444                 return 0;
 445         }
 446         else {
 447                 CtdlLogPrintf(CTDL_ERR, "connect() failed: %s\n", strerror(errno));
 448                 StrBufPrintf(IO->ErrMsg, "Failed to connect: %s", strerror(errno));
 449                 close(IO->sock);
 450 /*              IO->curr_ai = IO->curr_ai->ai_next;
 451                 if (IO->curr_ai != NULL)
 452                         return event_connect_socket(IO);
 453                         else*/
 454                         return -1;
 455         }
 456 }
 457
 458 void InitEventIO(AsyncIO *IO,
 459                  void *pData,
 460                  IO_CallBack ReadDone,
 461                  IO_CallBack SendDone,
 462                  IO_CallBack Terminate,
 463                  IO_CallBack Timeout,
 464                  IO_CallBack ConnFail,
 465                  IO_LineReaderCallback LineReader,
 466                  int conn_timeout,
 467                  int first_rw_timeout,
 468                  int ReadFirst)
 469 {
 470         IO->Data = pData;
 471         IO->SendDone = SendDone;
 472         IO->ReadDone = ReadDone;
 473         IO->Terminate = Terminate;
 474         IO->LineReader = LineReader;
 475
 476         if (ReadFirst) {
 477                 IO->NextState = eReadMessage;
 478         }
 479         else {
 480                 IO->NextState = eSendReply;
 481         }
 482         IO->IP6 = IO->HEnt->h_addrtype == AF_INET6;
 483 //      IO->res = HEnt->h_addr_list[0];
 484         event_connect_socket(IO, conn_timeout, first_rw_timeout);
 485 }
 486
 487
 488 #endif