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 #include "event_client.h"
  67
  68 extern int event_add_pipe[2];
  69 extern citthread_mutex_t EventQueueMutex;
  70 extern HashList *InboundEventQueue;
  71 extern struct ev_loop *event_base;
  72
  73
  74 int QueueEventContext(void *Ctx, AsyncIO *IO, EventContextAttach CB)
  75 {
  76         IOAddHandler *h;
  77         int i;
  78
  79         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
  80         h->Ctx = Ctx;
  81         h->EvAttch = CB;
  82
  83         citthread_mutex_lock(&EventQueueMutex);
  84         if (event_add_pipe[1] == -1) {
  85                 citthread_mutex_unlock(&EventQueueMutex);
  86                 free (h);
  87                 return -1;
  88         }
  89         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q\n");
  90         i = GetCount(InboundEventQueue);
  91         Put(InboundEventQueue, IKEY(i), h, NULL);
  92         citthread_mutex_unlock(&EventQueueMutex);
  93
  94         write(event_add_pipe[1], "+_", 1);
  95         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q Done.\n");
  96         return 0;
  97 }
  98
  99
 100 int ShutDownEventQueue(void)
 101 {
 102         citthread_mutex_lock(&EventQueueMutex);
 103         if (event_add_pipe[1] == -1) {
 104                 citthread_mutex_unlock(&EventQueueMutex);
 105
 106                 return -1;
 107         }
 108         write(event_add_pipe[1], "x_", 1);
 109         close(event_add_pipe[1]);
 110         event_add_pipe[1] = -1;
 111         citthread_mutex_unlock(&EventQueueMutex);
 112         return 0;
 113 }
 114
 115 void FreeAsyncIOContents(AsyncIO *IO)
 116 {
 117         FreeStrBuf(&IO->IOBuf);
 118         FreeStrBuf(&IO->SendBuf.Buf);
 119         FreeStrBuf(&IO->RecvBuf.Buf);
 120         ares_destroy(IO->DNSChannel);
 121 }
 122
 123
 124 void ShutDownCLient(AsyncIO *IO)
 125 {
 126         CtdlLogPrintf(CTDL_DEBUG, "EVENT x %d\n", IO->sock);
 127
 128         if (IO->sock != 0)
 129         {
 130                 ev_io_stop(event_base, &IO->send_event);
 131                 ev_io_stop(event_base, &IO->recv_event);
 132                 ev_timer_stop (event_base, &IO->rw_timeout);
 133                 close(IO->sock);
 134                 IO->sock = 0;
 135                 IO->SendBuf.fd = 0;
 136                 IO->RecvBuf.fd = 0;
 137         }
 138
 139         IO->Terminate(IO);
 140
 141 }
 142
 143
 144 eReadState HandleInbound(AsyncIO *IO)
 145 {
 146         eReadState Finished = eBufferNotEmpty;
 147
 148         while ((Finished == eBufferNotEmpty) && (IO->NextState == eReadMessage)){
 149                 if (IO->RecvBuf.nBlobBytesWanted != 0) {
 150
 151                 }
 152                 else { /* Reading lines... */
 153 //// lex line reply in callback, or do it ourselves. as nnn-blabla means continue reading in SMTP
 154                         if (IO->LineReader)
 155                                 Finished = IO->LineReader(IO);
 156                         else
 157                                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 158
 159                         switch (Finished) {
 160                         case eMustReadMore: /// read new from socket...
 161                                 return Finished;
 162                                 break;
 163                         case eBufferNotEmpty: /* shouldn't happen... */
 164                         case eReadSuccess: /// done for now...
 165                                 break;
 166                         case eReadFail: /// WHUT?
 167                                 ///todo: shut down!
 168                                 break;
 169                         }
 170
 171                 }
 172
 173                 if (Finished != eMustReadMore) {
 174                         ev_io_stop(event_base, &IO->recv_event);
 175                         IO->NextState = IO->ReadDone(IO);
 176                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 177                 }
 178         }
 179
 180
 181         if ((IO->NextState == eSendReply) ||
 182             (IO->NextState == eSendMore))
 183         {
 184                 IO->NextState = IO->SendDone(IO);
 185                 ev_io_start(event_base, &IO->send_event);
 186         }
 187         else if ((IO->NextState == eTerminateConnection) ||
 188                  (IO->NextState == eAbort) )
 189                 ShutDownCLient(IO);
 190         return Finished;
 191 }
 192
 193
 194 static void
 195 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 196 {
 197         int rc;
 198         AsyncIO *IO = watcher->data;
 199
 200         rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 201
 202         if (rc == 0)
 203         {
 204 #ifdef BIGBAD_IODBG
 205                 {
 206                         int rv = 0;
 207                         char fn [SIZ];
 208                         FILE *fd;
 209                         const char *pch = ChrPtr(IO->SendBuf.Buf);
 210                         const char *pchh = IO->SendBuf.ReadWritePointer;
 211                         long nbytes;
 212
 213                         if (pchh == NULL)
 214                                 pchh = pch;
 215
 216                         nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 217                         snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d", "smtpev", IO->sock);
 218
 219                         fd = fopen(fn, "a+");
 220                         fprintf(fd, "Read: BufSize: %ld BufContent: [",
 221                                 nbytes);
 222                         rv = fwrite(pchh, nbytes, 1, fd);
 223                         fprintf(fd, "]\n");
 224
 225
 226                         fclose(fd);
 227                 }
 228 #endif
 229                 ev_io_stop(event_base, &IO->send_event);
 230                 switch (IO->NextState) {
 231                 case eSendReply:
 232                         break;
 233                 case eSendMore:
 234                         IO->NextState = IO->SendDone(IO);
 235
 236                         if ((IO->NextState == eTerminateConnection) ||
 237                             (IO->NextState == eAbort) )
 238                                 ShutDownCLient(IO);
 239                         else {
 240                                 ev_io_start(event_base, &IO->send_event);
 241                         }
 242                         break;
 243                 case eReadMessage:
 244                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 245                                 HandleInbound(IO);
 246                         }
 247                         else {
 248                                 ev_io_start(event_base, &IO->recv_event);
 249                         }
 250
 251                         break;
 252                 case eTerminateConnection:
 253                 case eAbort:
 254                         break;
 255                 }
 256         }
 257         else if (rc < 0)
 258                 IO->Timeout(IO);
 259         /* else : must write more. */
 260 }
 261 static void
 262 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 263 {
 264
 265         switch(IO->NextState) {
 266         case eReadMessage:
 267                 ev_io_start(event_base, &IO->recv_event);
 268                 break;
 269         case eSendReply:
 270         case eSendMore:
 271                 IO_send_callback(loop, &IO->send_event, revents);
 272                 break;
 273         case eTerminateConnection:
 274         case eAbort:
 275                 /// TODO: WHUT?
 276                 break;
 277         }
 278 }
 279
 280 static void
 281 IO_Timout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 282 {
 283         AsyncIO *IO = watcher->data;
 284
 285         ev_timer_stop (event_base, &IO->rw_timeout);
 286         IO->Timeout(IO);
 287 }
 288 static void
 289 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 290 {
 291         AsyncIO *IO = watcher->data;
 292
 293         ev_timer_stop (event_base, &IO->conn_fail);
 294         ev_io_stop(loop, &IO->conn_event);
 295         IO->ConnFail(IO);
 296 }
 297 static void
 298 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 299 {
 300         AsyncIO *IO = watcher->data;
 301
 302         ev_io_stop(loop, &IO->conn_event);
 303         ev_timer_stop (event_base, &IO->conn_fail);
 304         set_start_callback(loop, IO, revents);
 305 }
 306 static void
 307 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 308 {
 309         ssize_t nbytes;
 310         AsyncIO *IO = watcher->data;
 311
 312         nbytes = StrBuf_read_one_chunk_callback(watcher->fd, 0 /*TODO */, &IO->RecvBuf);
 313         if (nbytes > 0) {
 314                 HandleInbound(IO);
 315         } else if (nbytes == 0) {
 316                 IO->Timeout(IO); /* this is a timeout... */
 317                 return;
 318         } else if (nbytes == -1) {
 319 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 320                 return;
 321         }
 322 }
 323
 324
 325
 326 int event_connect_socket(AsyncIO *IO, double conn_timeout, double first_rw_timeout)
 327 {
 328         struct sockaddr_in  saddr;
 329         int fdflags;
 330         int rc = -1;
 331
 332         IO->SendBuf.fd = IO->RecvBuf.fd =
 333                 IO->sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 334 /*
 335 IO->curr_ai->ai_family,
 336                           IO->curr_ai->ai_socktype,
 337                           IO->curr_ai->ai_protocol);
 338 */
 339         if (IO->sock < 0) {
 340                 CtdlLogPrintf(CTDL_ERR, "EVENT: socket() failed: %s\n", strerror(errno));
 341                 StrBufPrintf(IO->ErrMsg, "Failed to create socket: %s", strerror(errno));
 342 //              freeaddrinfo(res);
 343                 return -1;
 344         }
 345         fdflags = fcntl(IO->sock, F_GETFL);
 346         if (fdflags < 0) {
 347                 CtdlLogPrintf(CTDL_DEBUG,
 348                               "EVENT: unable to get socket flags! %s \n",
 349                               strerror(errno));
 350                 StrBufPrintf(IO->ErrMsg, "Failed to get socket flags: %s", strerror(errno));
 351                 return -1;
 352         }
 353         fdflags = fdflags | O_NONBLOCK;
 354         if (fcntl(IO->sock, F_SETFL, fdflags) < 0) {
 355                 CtdlLogPrintf(CTDL_DEBUG,
 356                               "EVENT: unable to set socket nonblocking flags! %s \n",
 357                               strerror(errno));
 358                 StrBufPrintf(IO->ErrMsg, "Failed to set socket flags: %s", strerror(errno));
 359                 close(IO->sock);
 360                 return -1;
 361         }
 362 /* TODO: maye we could use offsetof() to calc the position of data...
 363  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 364  */
 365         ev_io_init(&IO->recv_event, IO_recv_callback, IO->sock, EV_READ);
 366         IO->recv_event.data = IO;
 367         ev_io_init(&IO->send_event, IO_send_callback, IO->sock, EV_WRITE);
 368         IO->send_event.data = IO;
 369
 370         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 371         IO->conn_fail.data = IO;
 372         ev_timer_init(&IO->rw_timeout, IO_Timout_callback, first_rw_timeout, 0);
 373         IO->rw_timeout.data = IO;
 374
 375         memset( (struct sockaddr_in *)&saddr, '\0', sizeof( saddr ) );
 376
 377         memcpy(&saddr.sin_addr,
 378                IO->HEnt->h_addr_list[0],
 379                sizeof(struct in_addr));
 380 //      saddr.sin_addr.s_addr = inet_addr("127.0.0.1");
 381
 382         saddr.sin_family = AF_INET;
 383         saddr.sin_port = htons(IO->dport);
 384         rc = connect(IO->sock,
 385                      (struct sockaddr *) &saddr,
 386 /// TODO: ipv6??                     (IO->HEnt->h_addrtype == AF_INET6)?
 387                      /*     sizeof(in6_addr):*/
 388                      sizeof(struct sockaddr_in));
 389         if (rc >= 0){
 390 ////            freeaddrinfo(res);
 391                 set_start_callback(event_base, IO, 0);
 392                 ev_timer_start(event_base, &IO->rw_timeout);
 393                 return 0;
 394         }
 395         else if (errno == EINPROGRESS) {
 396
 397                 ev_io_init(&IO->conn_event, IO_connestd_callback, IO->sock, EV_READ|EV_WRITE);
 398                 IO->conn_event.data = IO;
 399
 400                 ev_io_start(event_base, &IO->conn_event);
 401                 ev_timer_start(event_base, &IO->conn_fail);
 402                 return 0;
 403         }
 404         else {
 405                 CtdlLogPrintf(CTDL_ERR, "connect() failed: %s\n", strerror(errno));
 406                 StrBufPrintf(IO->ErrMsg, "Failed to connect: %s", strerror(errno));
 407                 IO->ConnFail(IO);
 408                 return -1;
 409         }
 410 }
 411
 412 void SetNextTimeout(AsyncIO *IO, double timeout)
 413 {
 414         IO->rw_timeout.repeat = timeout;
 415         ev_timer_again (event_base,  &IO->rw_timeout);
 416 }
 417
 418 void InitEventIO(AsyncIO *IO,
 419                  void *pData,
 420                  IO_CallBack ReadDone,
 421                  IO_CallBack SendDone,
 422                  IO_CallBack Terminate,
 423                  IO_CallBack Timeout,
 424                  IO_CallBack ConnFail,
 425                  IO_LineReaderCallback LineReader,
 426                  double conn_timeout,
 427                  double first_rw_timeout,
 428                  int ReadFirst)
 429 {
 430         IO->Data = pData;
 431         IO->SendDone = SendDone;
 432         IO->ReadDone = ReadDone;
 433         IO->Terminate = Terminate;
 434         IO->LineReader = LineReader;
 435         IO->ConnFail = ConnFail;
 436         IO->Timeout = Timeout;
 437
 438         if (ReadFirst) {
 439                 IO->NextState = eReadMessage;
 440         }
 441         else {
 442                 IO->NextState = eSendReply;
 443         }
 444         IO->IP6 = IO->HEnt->h_addrtype == AF_INET6;
 445 //      IO->res = HEnt->h_addr_list[0];
 446         event_connect_socket(IO, conn_timeout, first_rw_timeout);
 447 }