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