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
  76 int QueueEventContext(void *Ctx, AsyncIO *IO, EventContextAttach CB)
  77 {
  78         IOAddHandler *h;
  79         int i;
  80
  81         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
  82         h->Ctx = Ctx;
  83         h->EvAttch = CB;
  84
  85         citthread_mutex_lock(&EventQueueMutex);
  86         if (event_add_pipe[1] == -1) {
  87                 citthread_mutex_unlock(&EventQueueMutex);
  88                 free (h);
  89                 return -1;
  90         }
  91         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q\n");
  92         i = GetCount(InboundEventQueue);
  93         Put(InboundEventQueue, IKEY(i), h, NULL);
  94         citthread_mutex_unlock(&EventQueueMutex);
  95
  96         write(event_add_pipe[1], "+_", 1);
  97         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q Done.\n");
  98         return 0;
  99 }
 100
 101
 102 int ShutDownEventQueue(void)
 103 {
 104         citthread_mutex_lock(&EventQueueMutex);
 105         if (event_add_pipe[1] == -1) {
 106                 citthread_mutex_unlock(&EventQueueMutex);
 107
 108                 return -1;
 109         }
 110         write(event_add_pipe[1], "x_", 1);
 111         close(event_add_pipe[1]);
 112         event_add_pipe[1] = -1;
 113         citthread_mutex_unlock(&EventQueueMutex);
 114         return 0;
 115 }
 116
 117 void FreeAsyncIOContents(AsyncIO *IO)
 118 {
 119         FreeStrBuf(&IO->IOBuf);
 120         FreeStrBuf(&IO->SendBuf.Buf);
 121         FreeStrBuf(&IO->RecvBuf.Buf);
 122         ares_destroy(IO->DNSChannel);
 123 }
 124
 125 /*
 126   static void
 127   setup_signal_handlers(struct instance *instance)
 128   {
 129   signal(SIGPIPE, SIG_IGN);
 130
 131   event_set(&instance->sigterm_event, SIGTERM, EV_SIGNAL|EV_PERSIST,
 132   exit_event_callback, instance);
 133   event_add(&instance->sigterm_event, NULL);
 134
 135   event_set(&instance->sigint_event, SIGINT, EV_SIGNAL|EV_PERSIST,
 136   exit_event_callback, instance);
 137   event_add(&instance->sigint_event, NULL);
 138
 139   event_set(&instance->sigquit_event, SIGQUIT, EV_SIGNAL|EV_PERSIST,
 140   exit_event_callback, instance);
 141   event_add(&instance->sigquit_event, NULL);
 142   }
 143 */
 144
 145 void ShutDownCLient(AsyncIO *IO)
 146 {
 147         CtdlLogPrintf(CTDL_DEBUG, "EVENT x %d\n", IO->sock);
 148
 149         if (IO->sock != 0)
 150         {
 151                 ev_io_stop(event_base, &IO->send_event);
 152                 ev_io_stop(event_base, &IO->recv_event);
 153                 close(IO->sock);
 154                 IO->sock = 0;
 155                 IO->SendBuf.fd = 0;
 156                 IO->RecvBuf.fd = 0;
 157         }
 158
 159         IO->Terminate(IO->Data);
 160
 161 }
 162
 163 eReadState HandleInbound(AsyncIO *IO)
 164 {
 165         eReadState Finished = eBufferNotEmpty;
 166
 167         while ((Finished == eBufferNotEmpty) && (IO->NextState == eReadMessage)){
 168                 if (IO->RecvBuf.nBlobBytesWanted != 0) {
 169
 170                 }
 171                 else { /* Reading lines... */
 172 //// lex line reply in callback, or do it ourselves. as nnn-blabla means continue reading in SMTP
 173                         if (IO->LineReader)
 174                                 Finished = IO->LineReader(IO);
 175                         else
 176                                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 177
 178                         switch (Finished) {
 179                         case eMustReadMore: /// read new from socket...
 180                                 return Finished;
 181                                 break;
 182                         case eBufferNotEmpty: /* shouldn't happen... */
 183                         case eReadSuccess: /// done for now...
 184                                 break;
 185                         case eReadFail: /// WHUT?
 186                                 ///todo: shut down!
 187                                 break;
 188                         }
 189
 190                 }
 191
 192                 if (Finished != eMustReadMore) {
 193                         ev_io_stop(event_base, &IO->recv_event);
 194                         IO->NextState = IO->ReadDone(IO->Data);
 195                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 196                 }
 197         }
 198
 199
 200         if ((IO->NextState == eSendReply) ||
 201             (IO->NextState == eSendMore))
 202         {
 203                 IO->NextState = IO->SendDone(IO->Data);
 204                 ev_io_start(event_base, &IO->send_event);
 205         }
 206         else if ((IO->NextState == eTerminateConnection) ||
 207                  (IO->NextState == eAbort) )
 208                 ShutDownCLient(IO);
 209         return Finished;
 210 }
 211
 212
 213 static void
 214 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 215 {
 216         int rc;
 217         AsyncIO *IO = watcher->data;
 218 /*
 219         CtdlLogPrintf(CTDL_DEBUG, "EVENT -> %d  : [%s%s%s%s]\n",
 220                       watcher->fd,
 221                       (event&EV_TIMEOUT) ? " timeout" : "",
 222                       (event&EV_READ)    ? " read" : "",
 223                       (event&EV_WRITE)   ? " write" : "",
 224                       (event&EV_SIGNAL)  ? " signal" : "");
 225 */
 226 ///    assert(fd == IO->sock);
 227
 228         rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 229
 230         if (rc == 0)
 231         {
 232 #ifdef BIGBAD_IODBG
 233                 {
 234                         int rv = 0;
 235                         char fn [SIZ];
 236                         FILE *fd;
 237                         const char *pch = ChrPtr(IO->SendBuf.Buf);
 238                         const char *pchh = IO->SendBuf.ReadWritePointer;
 239                         long nbytes;
 240
 241                         if (pchh == NULL)
 242                                 pchh = pch;
 243
 244                         nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 245                         snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d", "smtpev", IO->sock);
 246
 247                         fd = fopen(fn, "a+");
 248                         fprintf(fd, "Read: BufSize: %ld BufContent: [",
 249                                 nbytes);
 250                         rv = fwrite(pchh, nbytes, 1, fd);
 251                         fprintf(fd, "]\n");
 252
 253
 254                         fclose(fd);
 255                 }
 256 #endif
 257                 ev_io_stop(event_base, &IO->send_event);
 258                 switch (IO->NextState) {
 259                 case eSendReply:
 260                         break;
 261                 case eSendMore:
 262                         IO->NextState = IO->SendDone(IO->Data);
 263
 264                         if ((IO->NextState == eTerminateConnection) ||
 265                             (IO->NextState == eAbort) )
 266                                 ShutDownCLient(IO);
 267                         else {
 268                                 ev_io_start(event_base, &IO->send_event);
 269                         }
 270                         break;
 271                 case eReadMessage:
 272                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 273                                 HandleInbound(IO);
 274                         }
 275                         else {
 276                                 ev_io_start(event_base, &IO->recv_event);
 277                         }
 278
 279                         break;
 280                 case eTerminateConnection:
 281                 case eAbort:
 282                         break;
 283                 }
 284         }
 285         else if (rc < 0)
 286                 IO->Timeout(IO);
 287         /* else : must write more. */
 288 }
 289
 290 static void
 291 IO_Timout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 292 {
 293         AsyncIO *IO = watcher->data;
 294
 295         IO->Timeout(IO);
 296 }
 297 static void
 298 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 299 {
 300         AsyncIO *IO = watcher->data;
 301
 302         IO->ConnFail(IO);
 303 }
 304 static void
 305 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 306 {
 307         ssize_t nbytes;
 308         AsyncIO *IO = watcher->data;
 309
 310 //    assert(fd == IO->sock);
 311
 312 //    assert(fd == sb->fd);
 313 /*
 314         CtdlLogPrintf(CTDL_DEBUG, "EVENT <- %d  : [%s%s%s%s]\n",
 315             (int) fd,
 316             (event&EV_TIMEOUT) ? " timeout" : "",
 317             (event&EV_READ)    ? " read" : "",
 318             (event&EV_WRITE)   ? " write" : "",
 319             (event&EV_SIGNAL)  ? " signal" : "");
 320 */
 321         nbytes = StrBuf_read_one_chunk_callback(watcher->fd, 0 /*TODO */, &IO->RecvBuf);
 322         if (nbytes > 0) {
 323                 HandleInbound(IO);
 324         } else if (nbytes == 0) {
 325                 IO->Timeout(IO);
 326 ///  TODO: this is a timeout???  sock_buff_invoke_free(sb, 0); seems as if socket is gone then?
 327                 return;
 328         } else if (nbytes == -1) {
 329 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 330                 return;
 331         }
 332 }
 333
 334
 335 static void
 336 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents, int first_rw_timeout)
 337 {
 338         ev_timer_init(&IO->conn_timeout,
 339                       IO_Timout_callback,
 340                       first_rw_timeout, 0);
 341         IO->conn_timeout.data = IO;
 342
 343         switch(IO->NextState) {
 344         case eReadMessage:
 345                 ev_io_start(event_base, &IO->recv_event);
 346                 break;
 347         case eSendReply:
 348         case eSendMore:
 349                 IO_send_callback(loop, &IO->send_event, revents);
 350                 break;
 351         case eTerminateConnection:
 352         case eAbort:
 353                 /// TODO: WHUT?
 354                 break;
 355         }
 356 }
 357
 358 int event_connect_socket(AsyncIO *IO, int conn_timeout, int first_rw_timeout)
 359 {
 360         struct sockaddr_in  saddr;
 361         int fdflags;
 362         int rc = -1;
 363
 364         IO->SendBuf.fd = IO->RecvBuf.fd =
 365                 IO->sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 366 /*
 367 IO->curr_ai->ai_family,
 368                           IO->curr_ai->ai_socktype,
 369                           IO->curr_ai->ai_protocol);
 370 */
 371         if (IO->sock < 0) {
 372                 CtdlLogPrintf(CTDL_ERR, "EVENT: socket() failed: %s\n", strerror(errno));
 373                 StrBufPrintf(IO->ErrMsg, "Failed to create socket: %s", strerror(errno));
 374 //              freeaddrinfo(res);
 375                 return -1;
 376         }
 377         fdflags = fcntl(IO->sock, F_GETFL);
 378         if (fdflags < 0) {
 379                 CtdlLogPrintf(CTDL_DEBUG,
 380                               "EVENT: unable to get socket flags! %s \n",
 381                               strerror(errno));
 382                 StrBufPrintf(IO->ErrMsg, "Failed to get socket flags: %s", strerror(errno));
 383                 return -1;
 384         }
 385         fdflags = fdflags | O_NONBLOCK;
 386         if (fcntl(IO->sock, F_SETFL, fdflags) < 0) {
 387                 CtdlLogPrintf(CTDL_DEBUG,
 388                               "EVENT: unable to set socket nonblocking flags! %s \n",
 389                               strerror(errno));
 390                 StrBufPrintf(IO->ErrMsg, "Failed to set socket flags: %s", strerror(errno));
 391                 close(IO->sock);
 392                 return -1;
 393         }
 394 /* TODO: maye we could use offsetof() to calc the position of data...
 395  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 396  */
 397         ev_io_init(&IO->recv_event, IO_recv_callback, IO->sock, EV_READ);
 398         IO->recv_event.data = IO;
 399         ev_io_init(&IO->send_event, IO_send_callback, IO->sock, EV_WRITE);
 400         IO->send_event.data = IO;
 401
 402         memset( (struct sockaddr_in *)&saddr, '\0', sizeof( saddr ) );
 403
 404         memcpy(&saddr.sin_addr,
 405                IO->HEnt->h_addr_list[0],
 406                sizeof(struct in_addr));
 407
 408 //      saddr.sin_addr.s_addr = inet_addr("85.88.5.80");
 409         saddr.sin_family = AF_INET;
 410         saddr.sin_port = htons(IO->dport);
 411         rc = connect(IO->sock,
 412                      (struct sockaddr *) &saddr,
 413 /// TODO: ipv6??                     (IO->HEnt->h_addrtype == AF_INET6)?
 414                      /*     sizeof(in6_addr):*/
 415                      sizeof(struct sockaddr_in));
 416         if (rc >= 0){
 417 ////            freeaddrinfo(res);
 418                 set_start_callback(event_base, IO, 0, first_rw_timeout);
 419                 return 0;
 420         }
 421         else if (errno == EINPROGRESS) {
 422                 set_start_callback(event_base, IO, 0, first_rw_timeout);
 423                 ev_timer_init(&IO->conn_fail,
 424                               IO_connfail_callback,
 425                               conn_timeout, 0);
 426                 IO->conn_fail.data = IO;
 427                 ev_timer_start(event_base, &IO->conn_fail);
 428
 429                 return 0;
 430         }
 431         else {
 432                 CtdlLogPrintf(CTDL_ERR, "connect() failed: %s\n", strerror(errno));
 433                 StrBufPrintf(IO->ErrMsg, "Failed to connect: %s", strerror(errno));
 434                 close(IO->sock);
 435 /*              IO->curr_ai = IO->curr_ai->ai_next;
 436                 if (IO->curr_ai != NULL)
 437                         return event_connect_socket(IO);
 438                         else*/
 439                         return -1;
 440         }
 441 }
 442
 443 void InitEventIO(AsyncIO *IO,
 444                  void *pData,
 445                  IO_CallBack ReadDone,
 446                  IO_CallBack SendDone,
 447                  IO_CallBack Terminate,
 448                  IO_CallBack Timeout,
 449                  IO_CallBack ConnFail,
 450                  IO_LineReaderCallback LineReader,
 451                  int conn_timeout,
 452                  int first_rw_timeout,
 453                  int ReadFirst)
 454 {
 455         IO->Data = pData;
 456         IO->SendDone = SendDone;
 457         IO->ReadDone = ReadDone;
 458         IO->Terminate = Terminate;
 459         IO->LineReader = LineReader;
 460         IO->ConnFail = ConnFail;
 461
 462         if (ReadFirst) {
 463                 IO->NextState = eReadMessage;
 464         }
 465         else {
 466                 IO->NextState = eSendReply;
 467         }
 468         IO->IP6 = IO->HEnt->h_addrtype == AF_INET6;
 469 //      IO->res = HEnt->h_addr_list[0];
 470         event_connect_socket(IO, conn_timeout, first_rw_timeout);
 471 }
 472
 473
 474 #endif