citadel/modules/network/serv_networkclient.c

   1 /*
   2  * This module handles shared rooms, inter-Citadel mail, and outbound
   3  * mailing list processing.
   4  *
   5  * Copyright (c) 2000-2011 by the citadel.org team
   6  *
   7  *  This program is open source software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * ** NOTE **   A word on the S_NETCONFIGS semaphore:
  22  * This is a fairly high-level type of critical section.  It ensures that no
  23  * two threads work on the netconfigs files at the same time.  Since we do
  24  * so many things inside these, here are the rules:
  25  *  1. begin_critical_section(S_NETCONFIGS) *before* begin_ any others.
  26  *  2. Do *not* perform any I/O with the client during these sections.
  27  *
  28  */
  29
  30
  31 #include "sysdep.h"
  32 #include <stdlib.h>
  33 #include <unistd.h>
  34 #include <stdio.h>
  35 #include <fcntl.h>
  36 #include <ctype.h>
  37 #include <signal.h>
  38 #include <pwd.h>
  39 #include <errno.h>
  40 #include <sys/stat.h>
  41 #include <sys/types.h>
  42 #include <dirent.h>
  43 #if TIME_WITH_SYS_TIME
  44 # include <sys/time.h>
  45 # include <time.h>
  46 #else
  47 # if HAVE_SYS_TIME_H
  48 #  include <sys/time.h>
  49 # else
  50 #  include <time.h>
  51 # endif
  52 #endif
  53 #ifdef HAVE_SYSCALL_H
  54 # include <syscall.h>
  55 #else
  56 # if HAVE_SYS_SYSCALL_H
  57 #  include <sys/syscall.h>
  58 # endif
  59 #endif
  60
  61 #include <sys/wait.h>
  62 #include <string.h>
  63 #include <limits.h>
  64 #include <libcitadel.h>
  65 #include "citadel.h"
  66 #include "server.h"
  67 #include "citserver.h"
  68 #include "support.h"
  69 #include "config.h"
  70 #include "user_ops.h"
  71 #include "database.h"
  72 #include "msgbase.h"
  73 #include "internet_addressing.h"
  74 #include "serv_network.h"
  75 #include "clientsocket.h"
  76 #include "file_ops.h"
  77 #include "citadel_dirs.h"
  78 #include "threads.h"
  79
  80 #ifndef HAVE_SNPRINTF
  81 #include "snprintf.h"
  82 #endif
  83
  84 #include "context.h"
  85
  86 #include "netconfig.h"
  87 #include "ctdl_module.h"
  88
  89 struct CitContext networker_client_CC;
  90
  91 #define NODE ChrPtr(((AsyncNetworker*)IO->Data)->node)
  92 #define N ((AsyncNetworker*)IO->Data)->n
  93
  94 #define EVN_syslog(LEVEL, FORMAT, ...) \
  95         syslog(LEVEL, \
  96                "IO[%ld]CC[%d]NW[%s][%ld]" FORMAT, \
  97                IO->ID, CCID, NODE, N, __VA_ARGS__)
  98
  99 #define EVNM_syslog(LEVEL, FORMAT) \
 100         syslog(LEVEL, \
 101                "IO[%ld]CC[%d]NW[%s][%ld]" FORMAT, \
 102                IO->ID, CCID, NODE, N)
 103
 104 #define EVNCS_syslog(LEVEL, FORMAT, ...) \
 105         syslog(LEVEL, "IO[%ld]NW[%s][%ld]" FORMAT, \
 106                IO->ID, NODE, N, __VA_ARGS__)
 107
 108 #define EVNCSM_syslog(LEVEL, FORMAT) \
 109         syslog(LEVEL, "IO[%ld]NW[%s][%ld]" FORMAT, \
 110                IO->ID, NODE, N)
 111
 112
 113 typedef enum _eNWCState {
 114         eeGreating,
 115         eAuth,
 116         eNDOP,
 117         eREAD,
 118         eReadBLOB,
 119         eCLOS,
 120         eNUOP,
 121         eWRIT,
 122         eWriteBLOB,
 123         eUCLS,
 124         eQUIT
 125 }eNWCState;
 126
 127
 128 typedef struct _async_networker {
 129         AsyncIO IO;
 130         DNSQueryParts HostLookup;
 131         eNWCState State;
 132         long n;
 133         StrBuf *SpoolFileName;
 134         StrBuf *tempFileName;
 135         StrBuf *node;
 136         StrBuf *host;
 137         StrBuf *port;
 138         StrBuf *secret;
 139         StrBuf          *Url;
 140 } AsyncNetworker;
 141
 142 typedef eNextState(*NWClientHandler)(AsyncNetworker* NW);
 143 eNextState nwc_get_one_host_ip(AsyncIO *IO);
 144
 145 eNextState nwc_connect_ip(AsyncIO *IO);
 146
 147 eNextState NWC_SendQUIT(AsyncNetworker *NW);
 148 eNextState NWC_DispatchWriteDone(AsyncIO *IO);
 149
 150 void DeleteNetworker(void *vptr)
 151 {
 152         AsyncNetworker *NW = (AsyncNetworker *)vptr;
 153         FreeStrBuf(&NW->SpoolFileName);
 154         FreeStrBuf(&NW->tempFileName);
 155         FreeStrBuf(&NW->node);
 156         FreeStrBuf(&NW->host);
 157         FreeStrBuf(&NW->port);
 158         FreeStrBuf(&NW->secret);
 159         FreeStrBuf(&NW->Url);
 160         FreeAsyncIOContents(&NW->IO);
 161         free(NW);
 162 }
 163
 164 #define NWC_DBG_SEND() EVN_syslog(LOG_DEBUG, ": > %s", ChrPtr(NW->IO.SendBuf.Buf))
 165 #define NWC_DBG_READ() EVN_syslog(LOG_DEBUG, ": < %s\n", ChrPtr(NW->IO.IOBuf))
 166 #define NWC_OK (strncasecmp(ChrPtr(NW->IO.IOBuf), "+OK", 3) == 0)
 167
 168 eNextState FinalizeNetworker(AsyncIO *IO)
 169 {
 170         AsyncNetworker *NW = (AsyncNetworker *)IO->Data;
 171
 172         network_talking_to(SKEY(NW->node), NTT_REMOVE);
 173
 174         DeleteNetworker(IO->Data);
 175         return eAbort;
 176 }
 177
 178 eNextState NWC_ReadGreeting(AsyncNetworker *NW)
 179 {
 180         char connected_to[SIZ];
 181         AsyncIO *IO = &NW->IO;
 182         NWC_DBG_READ();
 183         /* Read the server greeting */
 184         /* Check that the remote is who we think it is and warn the Aide if not */
 185         extract_token (connected_to, ChrPtr(NW->IO.IOBuf), 1, ' ', sizeof connected_to);
 186         if (strcmp(connected_to, ChrPtr(NW->node)) != 0)
 187         {
 188                 if (NW->IO.ErrMsg == NULL)
 189                         NW->IO.ErrMsg = NewStrBuf();
 190                 StrBufPrintf(NW->IO.ErrMsg,
 191                              "Connected to node \"%s\" but I was expecting to connect to node \"%s\".",
 192                              connected_to, ChrPtr(NW->node));
 193                 EVN_syslog(LOG_ERR, "%s\n", ChrPtr(NW->IO.ErrMsg));
 194                 CtdlAideMessage(ChrPtr(NW->IO.ErrMsg), "Network error");
 195                 return eAbort;/// todo: aide message in anderer queue speichern
 196         }
 197         return eSendReply;
 198 }
 199
 200 eNextState NWC_SendAuth(AsyncNetworker *NW)
 201 {
 202         AsyncIO *IO = &NW->IO;
 203         /* We're talking to the correct node.  Now identify ourselves. */
 204         StrBufPrintf(NW->IO.SendBuf.Buf, "NETP %s|%s\n",
 205                      config.c_nodename,
 206                      ChrPtr(NW->secret));
 207         NWC_DBG_SEND();
 208         return eSendReply;
 209 }
 210
 211 eNextState NWC_ReadAuthReply(AsyncNetworker *NW)
 212 {
 213         AsyncIO *IO = &NW->IO;
 214         NWC_DBG_READ();
 215         if (ChrPtr(NW->IO.IOBuf)[0] == '2')
 216         {
 217                 return eSendReply;
 218         }
 219         else
 220         {
 221                 if (NW->IO.ErrMsg == NULL)
 222                         NW->IO.ErrMsg = NewStrBuf();
 223                 StrBufPrintf(NW->IO.ErrMsg,
 224                              "Connected to node \"%s\" but my secret wasn't accurate.",
 225                              ChrPtr(NW->node));
 226                 EVN_syslog(LOG_ERR, "%s\n", ChrPtr(NW->IO.ErrMsg));
 227                 CtdlAideMessage(ChrPtr(NW->IO.ErrMsg), "Network error");
 228
 229                 return eAbort;
 230         }
 231 }
 232
 233 eNextState NWC_SendNDOP(AsyncNetworker *NW)
 234 {
 235         AsyncIO *IO = &NW->IO;
 236         NW->tempFileName = NewStrBuf();
 237         NW->SpoolFileName = NewStrBuf();
 238         StrBufPrintf(NW->tempFileName,
 239                      "%s/%s.%lx%x",
 240                      ctdl_netin_dir,
 241                      ChrPtr(NW->node),
 242                      time(NULL),// TODO: get time from libev
 243                      rand());
 244         StrBufPrintf(NW->SpoolFileName,
 245                      "%s/%s.%lx%x",
 246                      ctdl_nettmp_dir,
 247                      ChrPtr(NW->node),
 248                      time(NULL),// TODO: get time from libev
 249                      rand());
 250
 251         /* We're talking to the correct node.  Now identify ourselves. */
 252         StrBufPlain(NW->IO.SendBuf.Buf, HKEY("NDOP\n"));
 253         NWC_DBG_SEND();
 254         return eSendReply;
 255 }
 256
 257 eNextState NWC_ReadNDOPReply(AsyncNetworker *NW)
 258 {
 259         AsyncIO *IO = &NW->IO;
 260         int TotalSendSize;
 261         NWC_DBG_READ();
 262         if (ChrPtr(NW->IO.IOBuf)[0] == '2')
 263         {
 264
 265                 NW->IO.IOB.TotalSentAlready = 0;
 266                 TotalSendSize = atol (ChrPtr(NW->IO.IOBuf) + 4);
 267                 EVN_syslog(LOG_DEBUG, "Expecting to transfer %ld bytes\n", NW->IO.IOB.TotalSendSize);
 268                 if (TotalSendSize <= 0) {
 269                         NW->State = eNUOP - 1;
 270                 }
 271                 else {
 272                         int fd;
 273                         fd = open(ChrPtr(NW->SpoolFileName),
 274                                   O_EXCL|O_CREAT|O_NONBLOCK|O_WRONLY,
 275                                   S_IRUSR|S_IWUSR);
 276                         if (fd < 0)
 277                         {
 278                                 EVN_syslog(LOG_CRIT,
 279                                        "cannot open %s: %s\n",
 280                                        ChrPtr(NW->SpoolFileName),
 281                                        strerror(errno));
 282
 283                                 NW->State = eQUIT - 1;
 284                                 return eAbort;
 285                         }
 286                         FDIOBufferInit(&NW->IO.IOB, &NW->IO.RecvBuf, fd, TotalSendSize);
 287                 }
 288                 return eSendReply;
 289         }
 290         else
 291         {
 292                 return eAbort;
 293         }
 294 }
 295
 296 eNextState NWC_SendREAD(AsyncNetworker *NW)
 297 {
 298         AsyncIO *IO = &NW->IO;
 299         eNextState rc;
 300
 301         if (NW->IO.IOB.TotalSentAlready < NW->IO.IOB.TotalSendSize)
 302         {
 303                 /*
 304                  * If shutting down we can exit here and unlink the temp file.
 305                  * this shouldn't loose us any messages.
 306                  */
 307                 if (server_shutting_down)
 308                 {
 309                         FDIOBufferDelete(&NW->IO.IOB);
 310                         unlink(ChrPtr(NW->tempFileName));
 311                         return eAbort;
 312                 }
 313                 StrBufPrintf(NW->IO.SendBuf.Buf, "READ %ld|%ld\n",
 314                              NW->IO.IOB.TotalSentAlready,
 315                              NW->IO.IOB.TotalSendSize);
 316 /*
 317                              ((NW->IO.IOB.TotalSendSize - NW->IO.IOB.TotalSentAlready > IGNET_PACKET_SIZE)
 318                               ? IGNET_PACKET_SIZE :
 319                               (NW->IO.IOB.TotalSendSize - NW->IO.IOB.TotalSentAlready))
 320                         );
 321 */
 322                 NWC_DBG_SEND();
 323                 return eSendReply;
 324         }
 325         else
 326         {
 327                 NW->State = eCLOS;
 328                 rc = NWC_DispatchWriteDone(&NW->IO);
 329                 NWC_DBG_SEND();
 330
 331                 return rc;
 332         }
 333 }
 334
 335 eNextState NWC_ReadREADState(AsyncNetworker *NW)
 336 {
 337         AsyncIO *IO = &NW->IO;
 338         NWC_DBG_READ();
 339         if (ChrPtr(NW->IO.IOBuf)[0] == '6')
 340         {
 341                 NW->IO.IOB.ChunkSendRemain =
 342                         NW->IO.IOB.ChunkSize = atol(ChrPtr(NW->IO.IOBuf)+4);
 343                 return eReadFile;
 344         }
 345         return eAbort;
 346 }
 347 eNextState NWC_ReadREADBlobDone(AsyncNetworker *NW);
 348 eNextState NWC_ReadREADBlob(AsyncNetworker *NW)
 349 {
 350         eNextState rc;
 351         AsyncIO *IO = &NW->IO;
 352         NWC_DBG_READ();
 353         if (NW->IO.IOB.TotalSendSize == NW->IO.IOB.TotalSentAlready)
 354         {
 355                 NW->State ++;
 356
 357                 FDIOBufferDelete(&NW->IO.IOB);
 358
 359                 if (link(ChrPtr(NW->SpoolFileName), ChrPtr(NW->tempFileName)) != 0) {
 360                         EVN_syslog(LOG_ALERT,
 361                                "Could not link %s to %s: %s\n",
 362                                ChrPtr(NW->tempFileName),
 363                                ChrPtr(NW->SpoolFileName),
 364                                strerror(errno));
 365                 }
 366
 367                 unlink(ChrPtr(NW->tempFileName));
 368                 rc = NWC_DispatchWriteDone(&NW->IO);
 369                 NW->State --;
 370                 return rc;
 371         }
 372         else {
 373                 NW->State --;
 374                 NW->IO.IOB.ChunkSendRemain = NW->IO.IOB.ChunkSize;
 375                 return NWC_DispatchWriteDone(&NW->IO);
 376         }
 377 }
 378
 379 eNextState NWC_ReadREADBlobDone(AsyncNetworker *NW)
 380 {
 381         eNextState rc;
 382         AsyncIO *IO = &NW->IO;
 383         NWC_DBG_READ();
 384         if (NW->IO.IOB.TotalSendSize == NW->IO.IOB.TotalSentAlready)
 385         {
 386                 NW->State ++;
 387
 388                 FDIOBufferDelete(&NW->IO.IOB);
 389
 390                 if (link(ChrPtr(NW->SpoolFileName), ChrPtr(NW->tempFileName)) != 0) {
 391                         EVN_syslog(LOG_ALERT,
 392                                "Could not link %s to %s: %s\n",
 393                                ChrPtr(NW->tempFileName),
 394                                ChrPtr(NW->SpoolFileName),
 395                                strerror(errno));
 396                 }
 397
 398                 unlink(ChrPtr(NW->tempFileName));
 399                 rc = NWC_DispatchWriteDone(&NW->IO);
 400                 NW->State --;
 401                 return rc;
 402         }
 403         else {
 404                 NW->State --;
 405                 NW->IO.IOB.ChunkSendRemain = NW->IO.IOB.ChunkSize;
 406                 return NWC_DispatchWriteDone(&NW->IO);
 407         }
 408 }
 409 eNextState NWC_SendCLOS(AsyncNetworker *NW)
 410 {
 411         AsyncIO *IO = &NW->IO;
 412         StrBufPlain(NW->IO.SendBuf.Buf, HKEY("CLOS\n"));
 413         NWC_DBG_SEND();
 414         return eSendReply;
 415 }
 416
 417 eNextState NWC_ReadCLOSReply(AsyncNetworker *NW)
 418 {
 419         AsyncIO *IO = &NW->IO;
 420         NWC_DBG_READ();
 421         if (ChrPtr(NW->IO.IOBuf)[0] != '2')
 422                 return eTerminateConnection;
 423         return eSendReply;
 424 }
 425
 426
 427 eNextState NWC_SendNUOP(AsyncNetworker *NW)
 428 {
 429         AsyncIO *IO = &NW->IO;
 430         eNextState rc;
 431         long TotalSendSize;
 432         struct stat statbuf;
 433         int fd;
 434
 435         StrBufPrintf(NW->tempFileName,
 436                      "%s/%s",
 437                      ctdl_netout_dir,
 438                      ChrPtr(NW->node));
 439         fd = open(ChrPtr(NW->tempFileName), O_RDONLY);
 440         if (fd < 0) {
 441                 if (errno != ENOENT) {
 442                         EVN_syslog(LOG_CRIT,
 443                                "cannot open %s: %s\n",
 444                                ChrPtr(NW->tempFileName),
 445                                strerror(errno));
 446                 }
 447                 NW->State = eQUIT;
 448                 rc = NWC_SendQUIT(NW);
 449                 NWC_DBG_SEND();
 450                 return rc;
 451         }
 452
 453         if (fstat(fd, &statbuf) == -1) {
 454                 EVN_syslog(LOG_CRIT, "FSTAT FAILED %s [%s]--\n",
 455                            ChrPtr(NW->tempFileName),
 456                            strerror(errno));
 457                 if (fd > 0) close(fd);
 458                 return eAbort;
 459         }
 460         TotalSendSize = statbuf.st_size;
 461         if (TotalSendSize == 0) {
 462                 EVNM_syslog(LOG_DEBUG,
 463                        "Nothing to send.\n");
 464                 NW->State = eQUIT;
 465                 rc = NWC_SendQUIT(NW);
 466                 NWC_DBG_SEND();
 467                 return rc;
 468         }
 469         FDIOBufferInit(&NW->IO.IOB, &NW->IO.SendBuf, fd, TotalSendSize);
 470
 471         StrBufPlain(NW->IO.SendBuf.Buf, HKEY("NUOP\n"));
 472         NWC_DBG_SEND();
 473         return eSendReply;
 474
 475 }
 476 eNextState NWC_ReadNUOPReply(AsyncNetworker *NW)
 477 {
 478         AsyncIO *IO = &NW->IO;
 479         NWC_DBG_READ();
 480         if (ChrPtr(NW->IO.IOBuf)[0] != '2')
 481                 return eAbort;
 482         return eSendReply;
 483 }
 484
 485 eNextState NWC_SendWRIT(AsyncNetworker *NW)
 486 {
 487         AsyncIO *IO = &NW->IO;
 488         StrBufPrintf(NW->IO.SendBuf.Buf, "WRIT %ld\n",
 489                      NW->IO.IOB.TotalSendSize - NW->IO.IOB.TotalSentAlready);
 490         NWC_DBG_SEND();
 491         return eSendReply;
 492 }
 493 eNextState NWC_ReadWRITReply(AsyncNetworker *NW)
 494 {
 495         AsyncIO *IO = &NW->IO;
 496         NWC_DBG_READ();
 497         if (ChrPtr(NW->IO.IOBuf)[0] != '7')
 498         {
 499                 return eAbort;
 500         }
 501
 502         NW->IO.IOB.ChunkSendRemain =
 503                 NW->IO.IOB.ChunkSize = atol(ChrPtr(NW->IO.IOBuf)+4);
 504         return eSendFile;
 505 }
 506
 507 eNextState NWC_SendBlobDone(AsyncNetworker *NW)
 508 {
 509         AsyncIO *IO = &NW->IO;
 510         eNextState rc;
 511         if (IO->IOB.TotalSendSize == NW->IO.IOB.TotalSentAlready)
 512         {
 513                 NW->State ++;
 514
 515                 FDIOBufferDelete(&IO->IOB);
 516                 rc =  NWC_DispatchWriteDone(IO);
 517                 NW->State --;
 518                 return rc;
 519         }
 520         else {
 521                 NW->State --;
 522                 IO->IOB.ChunkSendRemain = IO->IOB.ChunkSize;
 523                 rc = NWC_DispatchWriteDone(IO);
 524                 NW->State --;
 525                 return rc;
 526         }
 527 }
 528
 529 eNextState NWC_SendUCLS(AsyncNetworker *NW)
 530 {
 531         AsyncIO *IO = &NW->IO;
 532         StrBufPlain(NW->IO.SendBuf.Buf, HKEY("UCLS 1\n"));
 533         NWC_DBG_SEND();
 534         return eSendReply;
 535
 536 }
 537 eNextState NWC_ReadUCLS(AsyncNetworker *NW)
 538 {
 539         AsyncIO *IO = &NW->IO;
 540         NWC_DBG_READ();
 541
 542         EVN_syslog(LOG_NOTICE, "Sent %ld octets to <%s>\n", NW->IO.IOB.ChunkSize, ChrPtr(NW->node));
 543         if (ChrPtr(NW->IO.IOBuf)[0] == '2') {
 544                 EVN_syslog(LOG_DEBUG, "Removing <%s>\n", ChrPtr(NW->tempFileName));
 545                 unlink(ChrPtr(NW->tempFileName));
 546         }
 547         return eSendReply;
 548 }
 549
 550 eNextState NWC_SendQUIT(AsyncNetworker *NW)
 551 {
 552         AsyncIO *IO = &NW->IO;
 553         StrBufPlain(NW->IO.SendBuf.Buf, HKEY("QUIT\n"));
 554
 555         NWC_DBG_SEND();
 556         return eSendReply;
 557 }
 558
 559 eNextState NWC_ReadQUIT(AsyncNetworker *NW)
 560 {
 561         AsyncIO *IO = &NW->IO;
 562         NWC_DBG_READ();
 563
 564         return eAbort;
 565 }
 566
 567
 568 NWClientHandler NWC_ReadHandlers[] = {
 569         NWC_ReadGreeting,
 570         NWC_ReadAuthReply,
 571         NWC_ReadNDOPReply,
 572         NWC_ReadREADState,
 573         NWC_ReadREADBlob,
 574         NWC_ReadCLOSReply,
 575         NWC_ReadNUOPReply,
 576         NWC_ReadWRITReply,
 577         NWC_SendBlobDone,
 578         NWC_ReadUCLS,
 579         NWC_ReadQUIT};
 580
 581 long NWC_ConnTimeout = 100;
 582
 583 const long NWC_SendTimeouts[] = {
 584         100,
 585         100,
 586         100,
 587         100,
 588         100,
 589         100,
 590         100,
 591         100
 592 };
 593 const ConstStr NWC[] = {
 594         {HKEY("Connection broken during ")},
 595         {HKEY("Connection broken during ")},
 596         {HKEY("Connection broken during ")},
 597         {HKEY("Connection broken during ")},
 598         {HKEY("Connection broken during ")},
 599         {HKEY("Connection broken during ")},
 600         {HKEY("Connection broken during ")},
 601         {HKEY("Connection broken during ")}
 602 };
 603
 604 NWClientHandler NWC_SendHandlers[] = {
 605         NULL,
 606         NWC_SendAuth,
 607         NWC_SendNDOP,
 608         NWC_SendREAD,
 609         NWC_ReadREADBlobDone,
 610         NWC_SendCLOS,
 611         NWC_SendNUOP,
 612         NWC_SendWRIT,
 613         NWC_SendBlobDone,
 614         NWC_SendUCLS,
 615         NWC_SendQUIT
 616 };
 617
 618 const long NWC_ReadTimeouts[] = {
 619         100,
 620         100,
 621         100,
 622         100,
 623         100,
 624         100,
 625         100,
 626         100,
 627         100,
 628         100
 629 };
 630
 631
 632
 633
 634 eNextState nwc_get_one_host_ip_done(AsyncIO *IO)
 635 {
 636         AsyncNetworker *NW = IO->Data;
 637         struct hostent *hostent;
 638
 639         QueryCbDone(IO);
 640
 641         hostent = NW->HostLookup.VParsedDNSReply;
 642         if ((NW->HostLookup.DNSStatus == ARES_SUCCESS) &&
 643             (hostent != NULL) ) {
 644                 memset(&NW->IO.ConnectMe->Addr, 0, sizeof(struct in6_addr));
 645                 if (NW->IO.ConnectMe->IPv6) {
 646                         memcpy(&NW->IO.ConnectMe->Addr.sin6_addr.s6_addr,
 647                                &hostent->h_addr_list[0],
 648                                sizeof(struct in6_addr));
 649
 650                         NW->IO.ConnectMe->Addr.sin6_family = hostent->h_addrtype;
 651                         NW->IO.ConnectMe->Addr.sin6_port   = htons(atol(ChrPtr(NW->port)));//// TODO use the one from the URL.
 652                 }
 653                 else {
 654                         struct sockaddr_in *addr = (struct sockaddr_in*) &NW->IO.ConnectMe->Addr;
 655                         /* Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 656 //                      addr->sin_addr.s_addr = htonl((uint32_t)&hostent->h_addr_list[0]);
 657                         memcpy(&addr->sin_addr.s_addr,
 658                                hostent->h_addr_list[0],
 659                                sizeof(uint32_t));
 660
 661                         addr->sin_family = hostent->h_addrtype;
 662                         addr->sin_port   = htons(504);/// default citadel port
 663
 664                 }
 665                 return nwc_connect_ip(IO);
 666         }
 667         else
 668                 return eAbort;
 669 }
 670
 671
 672 eNextState nwc_get_one_host_ip(AsyncIO *IO)
 673 {
 674         AsyncNetworker *NW = IO->Data;
 675         /*
 676          * here we start with the lookup of one host.
 677          */
 678
 679         EVN_syslog(LOG_DEBUG, "NWC: %s\n", __FUNCTION__);
 680
 681         EVN_syslog(LOG_DEBUG,
 682                    "NWC client[%ld]: looking up %s-Record %s : %d ...\n",
 683                    NW->n,
 684                    (NW->IO.ConnectMe->IPv6)? "aaaa": "a",
 685                    NW->IO.ConnectMe->Host,
 686                    NW->IO.ConnectMe->Port);
 687
 688         QueueQuery((NW->IO.ConnectMe->IPv6)? ns_t_aaaa : ns_t_a,
 689                    NW->IO.ConnectMe->Host,
 690                    &NW->IO,
 691                    &NW->HostLookup,
 692                    nwc_get_one_host_ip_done);
 693         IO->NextState = eReadDNSReply;
 694         return IO->NextState;
 695 }
 696 /**
 697  * @brief lineread Handler; understands when to read more POP3 lines, and when this is a one-lined reply.
 698  */
 699 eReadState NWC_ReadServerStatus(AsyncIO *IO)
 700 {
 701 //      AsyncNetworker *NW = IO->Data;
 702         eReadState Finished = eBufferNotEmpty;
 703
 704         switch (IO->NextState) {
 705         case eSendDNSQuery:
 706         case eReadDNSReply:
 707         case eDBQuery:
 708         case eConnect:
 709         case eTerminateConnection:
 710         case eAbort:
 711                 Finished = eReadFail;
 712                 break;
 713         case eSendReply:
 714         case eSendMore:
 715         case eReadMore:
 716         case eReadMessage:
 717                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 718                 break;
 719         case eReadFile:
 720         case eSendFile:
 721         case eReadPayload:
 722                 break;
 723         }
 724         return Finished;
 725 }
 726
 727
 728
 729 eNextState NWC_FailNetworkConnection(AsyncIO *IO)
 730 {
 731         return eAbort;
 732 }
 733
 734 void NWC_SetTimeout(eNextState NextTCPState, AsyncNetworker *NW)
 735 {
 736         AsyncIO *IO = &NW->IO;
 737         double Timeout = 0.0;
 738
 739         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 740
 741         switch (NextTCPState) {
 742         case eSendReply:
 743         case eSendMore:
 744                 break;
 745         case eReadFile:
 746         case eReadMessage:
 747                 Timeout = NWC_ReadTimeouts[NW->State];
 748                 break;
 749         case eReadPayload:
 750                 Timeout = 100000;
 751                 /* TODO!!! */
 752                 break;
 753         case eSendDNSQuery:
 754         case eReadDNSReply:
 755         case eConnect:
 756         case eSendFile:
 757 //TODO
 758         case eTerminateConnection:
 759         case eDBQuery:
 760         case eAbort:
 761         case eReadMore://// TODO
 762                 return;
 763         }
 764         SetNextTimeout(&NW->IO, Timeout);
 765 }
 766
 767
 768 eNextState NWC_DispatchReadDone(AsyncIO *IO)
 769 {
 770         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 771         AsyncNetworker *NW = IO->Data;
 772         eNextState rc;
 773
 774         rc = NWC_ReadHandlers[NW->State](NW);
 775         if (rc != eReadMore)
 776                 NW->State++;
 777         NWC_SetTimeout(rc, NW);
 778         return rc;
 779 }
 780 eNextState NWC_DispatchWriteDone(AsyncIO *IO)
 781 {
 782         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 783         AsyncNetworker *NW = IO->Data;
 784         eNextState rc;
 785
 786         rc = NWC_SendHandlers[NW->State](NW);
 787         NWC_SetTimeout(rc, NW);
 788         return rc;
 789 }
 790
 791 /*****************************************************************************/
 792 /*                     Networker CLIENT ERROR CATCHERS                       */
 793 /*****************************************************************************/
 794 eNextState NWC_Terminate(AsyncIO *IO)
 795 {
 796         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 797         FinalizeNetworker(IO);
 798         return eAbort;
 799 }
 800
 801 eNextState NWC_Timeout(AsyncIO *IO)
 802 {
 803         AsyncNetworker *NW = IO->Data;
 804         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 805
 806         if (NW->IO.ErrMsg == NULL)
 807                 NW->IO.ErrMsg = NewStrBuf();
 808         StrBufPrintf(NW->IO.ErrMsg, "Timeout while talking to %s \r\n", ChrPtr(NW->host));
 809         return NWC_FailNetworkConnection(IO);
 810 }
 811 eNextState NWC_ConnFail(AsyncIO *IO)
 812 {
 813         AsyncNetworker *NW = IO->Data;
 814
 815         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 816         if (NW->IO.ErrMsg == NULL)
 817                 NW->IO.ErrMsg = NewStrBuf();
 818         StrBufPrintf(NW->IO.ErrMsg, "failed to connect %s \r\n", ChrPtr(NW->host));
 819
 820         return NWC_FailNetworkConnection(IO);
 821 }
 822 eNextState NWC_DNSFail(AsyncIO *IO)
 823 {
 824         AsyncNetworker *NW = IO->Data;
 825
 826         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 827         if (NW->IO.ErrMsg == NULL)
 828                 NW->IO.ErrMsg = NewStrBuf();
 829         StrBufPrintf(NW->IO.ErrMsg, "failed to look up %s \r\n", ChrPtr(NW->host));
 830
 831         return NWC_FailNetworkConnection(IO);
 832 }
 833 eNextState NWC_Shutdown(AsyncIO *IO)
 834 {
 835         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 836
 837         FinalizeNetworker(IO);
 838         return eAbort;
 839 }
 840
 841
 842 eNextState nwc_connect_ip(AsyncIO *IO)
 843 {
 844         AsyncNetworker *NW = IO->Data;
 845
 846         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 847         EVN_syslog(LOG_NOTICE, "Connecting to <%s> at %s:%s\n",
 848                    ChrPtr(NW->node),
 849                    ChrPtr(NW->host),
 850                    ChrPtr(NW->port));
 851
 852         return EvConnectSock(IO,
 853                              NWC_ConnTimeout,
 854                              NWC_ReadTimeouts[0],
 855                              1);
 856 }
 857
 858 static int NetworkerCount = 0;
 859 void RunNetworker(AsyncNetworker *NW)
 860 {
 861         NW->n = NetworkerCount++;
 862         network_talking_to(SKEY(NW->node), NTT_ADD);
 863         syslog(LOG_DEBUG, "NW[%s][%ld]: polling\n", ChrPtr(NW->node), NW->n);
 864         ParseURL(&NW->IO.ConnectMe, NW->Url, 504);
 865
 866         InitIOStruct(&NW->IO,
 867                      NW,
 868                      eReadMessage,
 869                      NWC_ReadServerStatus,
 870                      NWC_DNSFail,
 871                      NWC_DispatchWriteDone,
 872                      NWC_DispatchReadDone,
 873                      NWC_Terminate,
 874                      NWC_ConnFail,
 875                      NWC_Timeout,
 876                      NWC_Shutdown);
 877
 878         safestrncpy(((CitContext *)NW->IO.CitContext)->cs_host,
 879                     ChrPtr(NW->host),
 880                     sizeof(((CitContext *)NW->IO.CitContext)->cs_host));
 881
 882         if (NW->IO.ConnectMe->IsIP) {
 883                 QueueEventContext(&NW->IO,
 884                                   nwc_connect_ip);
 885         }
 886         else { /* uneducated admin has chosen to add DNS to the equation... */
 887                 QueueEventContext(&NW->IO,
 888                                   nwc_get_one_host_ip);
 889         }
 890 }
 891
 892 /*
 893  * Poll other Citadel nodes and transfer inbound/outbound network data.
 894  * Set "full" to nonzero to force a poll of every node, or to zero to poll
 895  * only nodes to which we have data to send.
 896  */
 897 void network_poll_other_citadel_nodes(int full_poll, char *working_ignetcfg)
 898 {
 899         AsyncNetworker *NW;
 900         StrBuf *CfgData;
 901         StrBuf *Line;
 902         const char *lptr;
 903         const char *CfgPtr;
 904         int Done;
 905
 906         int poll = 0;
 907
 908         if ((working_ignetcfg == NULL) || (*working_ignetcfg == '\0')) {
 909                 syslog(LOG_DEBUG, "network: no neighbor nodes are configured - not polling.\n");
 910                 return;
 911         }
 912         become_session(&networker_client_CC);
 913
 914         CfgData = NewStrBufPlain(working_ignetcfg, -1);
 915         Line = NewStrBufPlain(NULL, StrLength(CfgData));
 916         Done = 0;
 917         CfgPtr = NULL;
 918         while (!Done)
 919         {
 920                 /* Use the string tokenizer to grab one line at a time */
 921                 StrBufSipLine(Line, CfgData, &CfgPtr);
 922                 Done = CfgPtr == StrBufNOTNULL;
 923                 if (StrLength(Line) > 0)
 924                 {
 925                         if(server_shutting_down)
 926                                 return;/* TODO free stuff*/
 927                         lptr = NULL;
 928                         poll = 0;
 929                         NW = (AsyncNetworker*)malloc(sizeof(AsyncNetworker));
 930                         memset(NW, 0, sizeof(AsyncNetworker));
 931
 932                         NW->node = NewStrBufPlain(NULL, StrLength(Line));
 933                         NW->host = NewStrBufPlain(NULL, StrLength(Line));
 934                         NW->port = NewStrBufPlain(NULL, StrLength(Line));
 935                         NW->secret = NewStrBufPlain(NULL, StrLength(Line));
 936
 937                         StrBufExtract_NextToken(NW->node, Line, &lptr, '|');
 938                         StrBufExtract_NextToken(NW->secret, Line, &lptr, '|');
 939                         StrBufExtract_NextToken(NW->host, Line, &lptr, '|');
 940                         StrBufExtract_NextToken(NW->port, Line, &lptr, '|');
 941                         if ( (StrLength(NW->node) != 0) &&
 942                              (StrLength(NW->secret) != 0) &&
 943                              (StrLength(NW->host) != 0) &&
 944                              (StrLength(NW->port) != 0))
 945                         {
 946                                 poll = full_poll;
 947                                 if (poll == 0)
 948                                 {
 949                                         NW->SpoolFileName = NewStrBufPlain(ctdl_netout_dir, -1);
 950                                         StrBufAppendBufPlain(NW->SpoolFileName, HKEY("/"), 0);
 951                                         StrBufAppendBuf(NW->SpoolFileName, NW->node, 0);
 952                                         if (access(ChrPtr(NW->SpoolFileName), R_OK) == 0) {
 953                                                 poll = 1;
 954                                         }
 955                                 }
 956                         }
 957                         if (poll &&
 958                             (StrLength(NW->host) > 0) &&
 959                             strcmp("0.0.0.0", ChrPtr(NW->host)))
 960                         {
 961                                 NW->Url = NewStrBufPlain(NULL, StrLength(Line));
 962                                 StrBufPrintf(NW->Url, "citadel://:%s@%s:%s",
 963                                              ChrPtr(NW->secret),
 964                                              ChrPtr(NW->host),
 965                                              ChrPtr(NW->port));
 966                                 if (!network_talking_to(SKEY(NW->node), NTT_CHECK))
 967                                 {
 968                                         RunNetworker(NW);
 969                                         continue;
 970                                 }
 971                         }
 972                         DeleteNetworker(NW);
 973                 }
 974         }
 975         FreeStrBuf(&CfgData);
 976         FreeStrBuf(&Line);
 977
 978 }
 979
 980
 981 void network_do_clientqueue(void)
 982 {
 983         char *working_ignetcfg;
 984         int full_processing = 1;
 985         static time_t last_run = 0L;
 986
 987         /*
 988          * Run the full set of processing tasks no more frequently
 989          * than once every n seconds
 990          */
 991         if ( (time(NULL) - last_run) < config.c_net_freq ) {
 992                 full_processing = 0;
 993                 syslog(LOG_DEBUG, "Network full processing in %ld seconds.\n",
 994                         config.c_net_freq - (time(NULL)- last_run)
 995                 );
 996         }
 997
 998         working_ignetcfg = load_working_ignetcfg();
 999         /*
1000          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
1001          * then we poll everyone.  Otherwise we only poll nodes we have stuff
1002          * to send to.
1003          */
1004         network_poll_other_citadel_nodes(full_processing, working_ignetcfg);
1005         if (working_ignetcfg)
1006                 free(working_ignetcfg);
1007 }
1008
1009
1010
1011 /*
1012  * Module entry point
1013  */
1014 CTDL_MODULE_INIT(network_client)
1015 {
1016         if (!threading)
1017         {
1018                 CtdlFillSystemContext(&networker_client_CC, "CitNetworker");
1019
1020                 CtdlRegisterSessionHook(network_do_clientqueue, EVT_TIMER);
1021         }
1022         return "network_client";
1023 }