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) 2000-2012 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 int NetworkClientDebugEnabled = 0;
  95
  96 #define DBGLOG(LEVEL) if ((LEVEL != LOG_DEBUG) || (NetworkClientDebugEnabled != 0))
  97
  98 #define EVN_syslog(LEVEL, FORMAT, ...) \
  99         DBGLOG(LEVEL) syslog(LEVEL, \
 100                "IO[%ld]CC[%d]NW[%s][%ld]" FORMAT, \
 101                IO->ID, CCID, NODE, N, __VA_ARGS__)
 102
 103 #define EVNM_syslog(LEVEL, FORMAT) \
 104         DBGLOG(LEVEL) syslog(LEVEL, \
 105                "IO[%ld]CC[%d]NW[%s][%ld]" FORMAT, \
 106                IO->ID, CCID, NODE, N)
 107
 108 #define EVNCS_syslog(LEVEL, FORMAT, ...) \
 109         DBGLOG(LEVEL) syslog(LEVEL, "IO[%ld]NW[%s][%ld]" FORMAT, \
 110                IO->ID, NODE, N, __VA_ARGS__)
 111
 112 #define EVNCSM_syslog(LEVEL, FORMAT) \
 113         DBGLOG(LEVEL) syslog(LEVEL, "IO[%ld]NW[%s][%ld]" FORMAT, \
 114                IO->ID, NODE, N)
 115
 116
 117 typedef enum _eNWCState {
 118         eeGreating,
 119         eAuth,
 120         eNDOP,
 121         eREAD,
 122         eReadBLOB,
 123         eCLOS,
 124         eNUOP,
 125         eWRIT,
 126         eWriteBLOB,
 127         eUCLS,
 128         eQUIT
 129 }eNWCState;
 130
 131
 132 typedef struct _async_networker {
 133         AsyncIO IO;
 134         DNSQueryParts HostLookup;
 135         eNWCState State;
 136         long n;
 137         StrBuf *SpoolFileName;
 138         StrBuf *tempFileName;
 139         StrBuf *node;
 140         StrBuf *host;
 141         StrBuf *port;
 142         StrBuf *secret;
 143         StrBuf          *Url;
 144 } AsyncNetworker;
 145
 146 typedef eNextState(*NWClientHandler)(AsyncNetworker* NW);
 147 eNextState nwc_get_one_host_ip(AsyncIO *IO);
 148
 149 eNextState nwc_connect_ip(AsyncIO *IO);
 150
 151 eNextState NWC_SendQUIT(AsyncNetworker *NW);
 152 eNextState NWC_DispatchWriteDone(AsyncIO *IO);
 153
 154 void DeleteNetworker(void *vptr)
 155 {
 156         AsyncNetworker *NW = (AsyncNetworker *)vptr;
 157         FreeStrBuf(&NW->SpoolFileName);
 158         FreeStrBuf(&NW->tempFileName);
 159         FreeStrBuf(&NW->node);
 160         FreeStrBuf(&NW->host);
 161         FreeStrBuf(&NW->port);
 162         FreeStrBuf(&NW->secret);
 163         FreeStrBuf(&NW->Url);
 164         FreeStrBuf(&NW->IO.ErrMsg);
 165         FreeAsyncIOContents(&NW->IO);
 166         if (NW->HostLookup.VParsedDNSReply != NULL) {
 167                 NW->HostLookup.DNSReplyFree(NW->HostLookup.VParsedDNSReply);
 168                 NW->HostLookup.VParsedDNSReply = NULL;
 169         }
 170         free(NW);
 171 }
 172
 173 #define NWC_DBG_SEND() EVN_syslog(LOG_DEBUG, ": > %s", ChrPtr(NW->IO.SendBuf.Buf))
 174 #define NWC_DBG_READ() EVN_syslog(LOG_DEBUG, ": < %s\n", ChrPtr(NW->IO.IOBuf))
 175 #define NWC_OK (strncasecmp(ChrPtr(NW->IO.IOBuf), "+OK", 3) == 0)
 176
 177 eNextState FinalizeNetworker(AsyncIO *IO)
 178 {
 179         AsyncNetworker *NW = (AsyncNetworker *)IO->Data;
 180
 181         network_talking_to(SKEY(NW->node), NTT_REMOVE);
 182
 183         DeleteNetworker(IO->Data);
 184         return eAbort;
 185 }
 186
 187 eNextState NWC_ReadGreeting(AsyncNetworker *NW)
 188 {
 189         char connected_to[SIZ];
 190         AsyncIO *IO = &NW->IO;
 191         NWC_DBG_READ();
 192         /* Read the server greeting */
 193         /* Check that the remote is who we think it is and warn the Aide if not */
 194         extract_token (connected_to, ChrPtr(NW->IO.IOBuf), 1, ' ', sizeof connected_to);
 195         if (strcmp(connected_to, ChrPtr(NW->node)) != 0)
 196         {
 197                 if (NW->IO.ErrMsg == NULL)
 198                         NW->IO.ErrMsg = NewStrBuf();
 199                 StrBufPrintf(NW->IO.ErrMsg,
 200                              "Connected to node \"%s\" but I was expecting to connect to node \"%s\".",
 201                              connected_to, ChrPtr(NW->node));
 202                 EVN_syslog(LOG_ERR, "%s\n", ChrPtr(NW->IO.ErrMsg));
 203                 CtdlAideMessage(ChrPtr(NW->IO.ErrMsg), "Network error");
 204                 return eAbort;/// todo: aide message in anderer queue speichern
 205         }
 206         return eSendReply;
 207 }
 208
 209 eNextState NWC_SendAuth(AsyncNetworker *NW)
 210 {
 211         AsyncIO *IO = &NW->IO;
 212         /* We're talking to the correct node.  Now identify ourselves. */
 213         StrBufPrintf(NW->IO.SendBuf.Buf, "NETP %s|%s\n",
 214                      config.c_nodename,
 215                      ChrPtr(NW->secret));
 216         NWC_DBG_SEND();
 217         return eSendReply;
 218 }
 219
 220 eNextState NWC_ReadAuthReply(AsyncNetworker *NW)
 221 {
 222         AsyncIO *IO = &NW->IO;
 223         NWC_DBG_READ();
 224         if (ChrPtr(NW->IO.IOBuf)[0] == '2')
 225         {
 226                 return eSendReply;
 227         }
 228         else
 229         {
 230                 if (NW->IO.ErrMsg == NULL)
 231                         NW->IO.ErrMsg = NewStrBuf();
 232                 StrBufPrintf(NW->IO.ErrMsg,
 233                              "Connected to node \"%s\" but my secret wasn't accurate.",
 234                              ChrPtr(NW->node));
 235                 EVN_syslog(LOG_ERR, "%s\n", ChrPtr(NW->IO.ErrMsg));
 236                 CtdlAideMessage(ChrPtr(NW->IO.ErrMsg), "Network error");
 237
 238                 return eAbort;
 239         }
 240 }
 241
 242 eNextState NWC_SendNDOP(AsyncNetworker *NW)
 243 {
 244         AsyncIO *IO = &NW->IO;
 245         NW->tempFileName = NewStrBuf();
 246         NW->SpoolFileName = NewStrBuf();
 247         StrBufPrintf(NW->SpoolFileName,
 248                      "%s/%s.%lx%x",
 249                      ctdl_netin_dir,
 250                      ChrPtr(NW->node),
 251                      time(NULL),// TODO: get time from libev
 252                      rand());
 253         StrBufStripSlashes(NW->SpoolFileName, 1);
 254         StrBufPrintf(NW->tempFileName,
 255                      "%s/%s.%lx%x",
 256                      ctdl_nettmp_dir,
 257                      ChrPtr(NW->node),
 258                      time(NULL),// TODO: get time from libev
 259                      rand());
 260         StrBufStripSlashes(NW->tempFileName, 1);
 261         /* We're talking to the correct node.  Now identify ourselves. */
 262         StrBufPlain(NW->IO.SendBuf.Buf, HKEY("NDOP\n"));
 263         NWC_DBG_SEND();
 264         return eSendReply;
 265 }
 266
 267 eNextState NWC_ReadNDOPReply(AsyncNetworker *NW)
 268 {
 269         AsyncIO *IO = &NW->IO;
 270         int TotalSendSize;
 271         NWC_DBG_READ();
 272         if (ChrPtr(NW->IO.IOBuf)[0] == '2')
 273         {
 274
 275                 NW->IO.IOB.TotalSentAlready = 0;
 276                 TotalSendSize = atol (ChrPtr(NW->IO.IOBuf) + 4);
 277                 EVN_syslog(LOG_DEBUG, "Expecting to transfer %d bytes\n", TotalSendSize);
 278                 if (TotalSendSize <= 0) {
 279                         NW->State = eNUOP - 1;
 280                 }
 281                 else {
 282                         int fd;
 283                         fd = open(ChrPtr(NW->tempFileName),
 284                                   O_EXCL|O_CREAT|O_NONBLOCK|O_WRONLY,
 285                                   S_IRUSR|S_IWUSR);
 286                         if (fd < 0)
 287                         {
 288                                 EVN_syslog(LOG_CRIT,
 289                                        "cannot open %s: %s\n",
 290                                        ChrPtr(NW->tempFileName),
 291                                        strerror(errno));
 292
 293                                 NW->State = eQUIT - 1;
 294                                 return eAbort;
 295                         }
 296                         FDIOBufferInit(&NW->IO.IOB, &NW->IO.RecvBuf, fd, TotalSendSize);
 297                 }
 298                 return eSendReply;
 299         }
 300         else
 301         {
 302                 return eAbort;
 303         }
 304 }
 305
 306 eNextState NWC_SendREAD(AsyncNetworker *NW)
 307 {
 308         AsyncIO *IO = &NW->IO;
 309         eNextState rc;
 310
 311         if (NW->IO.IOB.TotalSentAlready < NW->IO.IOB.TotalSendSize)
 312         {
 313                 /*
 314                  * If shutting down we can exit here and unlink the temp file.
 315                  * this shouldn't loose us any messages.
 316                  */
 317                 if (server_shutting_down)
 318                 {
 319                         FDIOBufferDelete(&NW->IO.IOB);
 320                         unlink(ChrPtr(NW->tempFileName));
 321                         FDIOBufferDelete(&IO->IOB);
 322                         return eAbort;
 323                 }
 324                 StrBufPrintf(NW->IO.SendBuf.Buf, "READ %ld|%ld\n",
 325                              NW->IO.IOB.TotalSentAlready,
 326                              NW->IO.IOB.TotalSendSize);
 327 /*
 328                              ((NW->IO.IOB.TotalSendSize - NW->IO.IOB.TotalSentAlready > IGNET_PACKET_SIZE)
 329                               ? IGNET_PACKET_SIZE :
 330                               (NW->IO.IOB.TotalSendSize - NW->IO.IOB.TotalSentAlready))
 331                         );
 332 */
 333                 NWC_DBG_SEND();
 334                 return eSendReply;
 335         }
 336         else
 337         {
 338                 NW->State = eCLOS;
 339                 rc = NWC_DispatchWriteDone(&NW->IO);
 340                 NWC_DBG_SEND();
 341
 342                 return rc;
 343         }
 344 }
 345
 346 eNextState NWC_ReadREADState(AsyncNetworker *NW)
 347 {
 348         AsyncIO *IO = &NW->IO;
 349         NWC_DBG_READ();
 350         if (ChrPtr(NW->IO.IOBuf)[0] == '6')
 351         {
 352                 NW->IO.IOB.ChunkSendRemain =
 353                         NW->IO.IOB.ChunkSize = atol(ChrPtr(NW->IO.IOBuf)+4);
 354                 return eReadFile;
 355         }
 356         FDIOBufferDelete(&IO->IOB);
 357         return eAbort;
 358 }
 359 eNextState NWC_ReadREADBlobDone(AsyncNetworker *NW);
 360 eNextState NWC_ReadREADBlob(AsyncNetworker *NW)
 361 {
 362         eNextState rc;
 363         AsyncIO *IO = &NW->IO;
 364         NWC_DBG_READ();
 365         if (NW->IO.IOB.TotalSendSize == NW->IO.IOB.TotalSentAlready)
 366         {
 367                 NW->State ++;
 368
 369                 FDIOBufferDelete(&NW->IO.IOB);
 370
 371                 if (link(ChrPtr(NW->tempFileName), ChrPtr(NW->SpoolFileName)) != 0) {
 372                         EVN_syslog(LOG_ALERT,
 373                                "Could not link %s to %s: %s\n",
 374                                ChrPtr(NW->tempFileName),
 375                                ChrPtr(NW->SpoolFileName),
 376                                strerror(errno));
 377                 }
 378
 379                 unlink(ChrPtr(NW->tempFileName));
 380                 rc = NWC_DispatchWriteDone(&NW->IO);
 381                 NW->State --;
 382                 return rc;
 383         }
 384         else {
 385                 NW->State --;
 386                 NW->IO.IOB.ChunkSendRemain = NW->IO.IOB.ChunkSize;
 387                 return eSendReply; //NWC_DispatchWriteDone(&NW->IO);
 388         }
 389 }
 390
 391 eNextState NWC_ReadREADBlobDone(AsyncNetworker *NW)
 392 {
 393         eNextState rc;
 394         AsyncIO *IO = &NW->IO;
 395 /* we don't have any data to debug print here. */
 396         if (NW->IO.IOB.TotalSentAlready >= NW->IO.IOB.TotalSendSize)
 397         {
 398                 NW->State ++;
 399
 400                 FDIOBufferDelete(&NW->IO.IOB);
 401                 if (link(ChrPtr(NW->tempFileName), ChrPtr(NW->SpoolFileName)) != 0) {
 402                         EVN_syslog(LOG_ALERT,
 403                                "Could not link %s to %s: %s\n",
 404                                ChrPtr(NW->tempFileName),
 405                                ChrPtr(NW->SpoolFileName),
 406                                strerror(errno));
 407                 }
 408
 409                 unlink(ChrPtr(NW->tempFileName));
 410                 rc = NWC_DispatchWriteDone(&NW->IO);
 411                 NW->State --;
 412                 return rc;
 413         }
 414         else {
 415                 NW->State --;
 416                 NW->IO.IOB.ChunkSendRemain = NW->IO.IOB.ChunkSize;
 417                 return NWC_DispatchWriteDone(&NW->IO);
 418         }
 419 }
 420 eNextState NWC_SendCLOS(AsyncNetworker *NW)
 421 {
 422         AsyncIO *IO = &NW->IO;
 423         StrBufPlain(NW->IO.SendBuf.Buf, HKEY("CLOS\n"));
 424         NWC_DBG_SEND();
 425         return eSendReply;
 426 }
 427
 428 eNextState NWC_ReadCLOSReply(AsyncNetworker *NW)
 429 {
 430         AsyncIO *IO = &NW->IO;
 431         NWC_DBG_READ();
 432         FDIOBufferDelete(&IO->IOB);
 433         if (ChrPtr(NW->IO.IOBuf)[0] != '2')
 434                 return eTerminateConnection;
 435         return eSendReply;
 436 }
 437
 438
 439 eNextState NWC_SendNUOP(AsyncNetworker *NW)
 440 {
 441         AsyncIO *IO = &NW->IO;
 442         eNextState rc;
 443         long TotalSendSize;
 444         struct stat statbuf;
 445         int fd;
 446
 447         StrBufPrintf(NW->SpoolFileName,
 448                      "%s/%s",
 449                      ctdl_netout_dir,
 450                      ChrPtr(NW->node));
 451         StrBufStripSlashes(NW->SpoolFileName, 1);
 452
 453         fd = open(ChrPtr(NW->SpoolFileName), O_EXCL|O_NONBLOCK|O_RDONLY);
 454         if (fd < 0) {
 455                 if (errno != ENOENT) {
 456                         EVN_syslog(LOG_CRIT,
 457                                "cannot open %s: %s\n",
 458                                ChrPtr(NW->SpoolFileName),
 459                                strerror(errno));
 460                 }
 461                 NW->State = eQUIT;
 462                 rc = NWC_SendQUIT(NW);
 463                 NWC_DBG_SEND();
 464                 return rc;
 465         }
 466
 467         if (fstat(fd, &statbuf) == -1) {
 468                 EVN_syslog(LOG_CRIT, "FSTAT FAILED %s [%s]--\n",
 469                            ChrPtr(NW->SpoolFileName),
 470                            strerror(errno));
 471                 if (fd > 0) close(fd);
 472                 return eAbort;
 473         }
 474         TotalSendSize = statbuf.st_size;
 475         if (TotalSendSize == 0) {
 476                 EVNM_syslog(LOG_DEBUG,
 477                        "Nothing to send.\n");
 478                 NW->State = eQUIT;
 479                 rc = NWC_SendQUIT(NW);
 480                 NWC_DBG_SEND();
 481                 if (fd > 0) close(fd);
 482                 return rc;
 483         }
 484         FDIOBufferInit(&NW->IO.IOB, &NW->IO.SendBuf, fd, TotalSendSize);
 485
 486         StrBufPlain(NW->IO.SendBuf.Buf, HKEY("NUOP\n"));
 487         NWC_DBG_SEND();
 488         return eSendReply;
 489
 490 }
 491 eNextState NWC_ReadNUOPReply(AsyncNetworker *NW)
 492 {
 493         AsyncIO *IO = &NW->IO;
 494         NWC_DBG_READ();
 495         if (ChrPtr(NW->IO.IOBuf)[0] != '2') {
 496                 FDIOBufferDelete(&IO->IOB);
 497                 return eAbort;
 498         }
 499         return eSendReply;
 500 }
 501
 502 eNextState NWC_SendWRIT(AsyncNetworker *NW)
 503 {
 504         AsyncIO *IO = &NW->IO;
 505         StrBufPrintf(NW->IO.SendBuf.Buf, "WRIT %ld\n",
 506                      NW->IO.IOB.TotalSendSize - NW->IO.IOB.TotalSentAlready);
 507         NWC_DBG_SEND();
 508         return eSendReply;
 509 }
 510 eNextState NWC_ReadWRITReply(AsyncNetworker *NW)
 511 {
 512         AsyncIO *IO = &NW->IO;
 513         NWC_DBG_READ();
 514         if (ChrPtr(NW->IO.IOBuf)[0] != '7')
 515         {
 516                 FDIOBufferDelete(&IO->IOB);
 517                 return eAbort;
 518         }
 519
 520         NW->IO.IOB.ChunkSendRemain =
 521                 NW->IO.IOB.ChunkSize = atol(ChrPtr(NW->IO.IOBuf)+4);
 522         return eSendFile;
 523 }
 524
 525 eNextState NWC_SendBlobDone(AsyncNetworker *NW)
 526 {
 527         AsyncIO *IO = &NW->IO;
 528         eNextState rc;
 529         if (NW->IO.IOB.TotalSentAlready >= IO->IOB.TotalSendSize)
 530         {
 531                 NW->State ++;
 532
 533                 FDIOBufferDelete(&IO->IOB);
 534                 rc =  NWC_DispatchWriteDone(IO);
 535                 NW->State --;
 536                 return rc;
 537         }
 538         else {
 539                 NW->State --;
 540                 IO->IOB.ChunkSendRemain = IO->IOB.ChunkSize;
 541                 rc = NWC_DispatchWriteDone(IO);
 542                 NW->State --;
 543                 return rc;
 544         }
 545 }
 546
 547 eNextState NWC_SendUCLS(AsyncNetworker *NW)
 548 {
 549         AsyncIO *IO = &NW->IO;
 550         StrBufPlain(NW->IO.SendBuf.Buf, HKEY("UCLS 1\n"));
 551         NWC_DBG_SEND();
 552         return eSendReply;
 553
 554 }
 555 eNextState NWC_ReadUCLS(AsyncNetworker *NW)
 556 {
 557         AsyncIO *IO = &NW->IO;
 558         NWC_DBG_READ();
 559
 560         EVN_syslog(LOG_NOTICE, "Sent %ld octets to <%s>\n", NW->IO.IOB.ChunkSize, ChrPtr(NW->node));
 561         if (ChrPtr(NW->IO.IOBuf)[0] == '2') {
 562                 EVN_syslog(LOG_DEBUG, "Removing <%s>\n", ChrPtr(NW->SpoolFileName));
 563                 unlink(ChrPtr(NW->SpoolFileName));
 564         }
 565         FDIOBufferDelete(&IO->IOB);
 566         return eSendReply;
 567 }
 568
 569 eNextState NWC_SendQUIT(AsyncNetworker *NW)
 570 {
 571         AsyncIO *IO = &NW->IO;
 572         StrBufPlain(NW->IO.SendBuf.Buf, HKEY("QUIT\n"));
 573
 574         NWC_DBG_SEND();
 575         return eSendReply;
 576 }
 577
 578 eNextState NWC_ReadQUIT(AsyncNetworker *NW)
 579 {
 580         AsyncIO *IO = &NW->IO;
 581         NWC_DBG_READ();
 582
 583         return eAbort;
 584 }
 585
 586
 587 NWClientHandler NWC_ReadHandlers[] = {
 588         NWC_ReadGreeting,
 589         NWC_ReadAuthReply,
 590         NWC_ReadNDOPReply,
 591         NWC_ReadREADState,
 592         NWC_ReadREADBlob,
 593         NWC_ReadCLOSReply,
 594         NWC_ReadNUOPReply,
 595         NWC_ReadWRITReply,
 596         NWC_SendBlobDone,
 597         NWC_ReadUCLS,
 598         NWC_ReadQUIT};
 599
 600 long NWC_ConnTimeout = 100;
 601
 602 const long NWC_SendTimeouts[] = {
 603         100,
 604         100,
 605         100,
 606         100,
 607         100,
 608         100,
 609         100,
 610         100
 611 };
 612 const ConstStr NWC[] = {
 613         {HKEY("Connection broken during ")},
 614         {HKEY("Connection broken during ")},
 615         {HKEY("Connection broken during ")},
 616         {HKEY("Connection broken during ")},
 617         {HKEY("Connection broken during ")},
 618         {HKEY("Connection broken during ")},
 619         {HKEY("Connection broken during ")},
 620         {HKEY("Connection broken during ")}
 621 };
 622
 623 NWClientHandler NWC_SendHandlers[] = {
 624         NULL,
 625         NWC_SendAuth,
 626         NWC_SendNDOP,
 627         NWC_SendREAD,
 628         NWC_ReadREADBlobDone,
 629         NWC_SendCLOS,
 630         NWC_SendNUOP,
 631         NWC_SendWRIT,
 632         NWC_SendBlobDone,
 633         NWC_SendUCLS,
 634         NWC_SendQUIT
 635 };
 636
 637 const long NWC_ReadTimeouts[] = {
 638         100,
 639         100,
 640         100,
 641         100,
 642         100,
 643         100,
 644         100,
 645         100,
 646         100,
 647         100
 648 };
 649
 650
 651
 652
 653 eNextState nwc_get_one_host_ip_done(AsyncIO *IO)
 654 {
 655         AsyncNetworker *NW = IO->Data;
 656         struct hostent *hostent;
 657
 658         QueryCbDone(IO);
 659
 660         hostent = NW->HostLookup.VParsedDNSReply;
 661         if ((NW->HostLookup.DNSStatus == ARES_SUCCESS) &&
 662             (hostent != NULL) ) {
 663                 memset(&NW->IO.ConnectMe->Addr, 0, sizeof(struct in6_addr));
 664                 if (NW->IO.ConnectMe->IPv6) {
 665                         memcpy(&NW->IO.ConnectMe->Addr.sin6_addr.s6_addr,
 666                                &hostent->h_addr_list[0],
 667                                sizeof(struct in6_addr));
 668
 669                         NW->IO.ConnectMe->Addr.sin6_family = hostent->h_addrtype;
 670                         NW->IO.ConnectMe->Addr.sin6_port   = htons(atol(ChrPtr(NW->port)));//// TODO use the one from the URL.
 671                 }
 672                 else {
 673                         struct sockaddr_in *addr = (struct sockaddr_in*) &NW->IO.ConnectMe->Addr;
 674                         /* Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 675 //                      addr->sin_addr.s_addr = htonl((uint32_t)&hostent->h_addr_list[0]);
 676                         memcpy(&addr->sin_addr.s_addr,
 677                                hostent->h_addr_list[0],
 678                                sizeof(uint32_t));
 679
 680                         addr->sin_family = hostent->h_addrtype;
 681                         addr->sin_port   = htons(504);/// default citadel port
 682
 683                 }
 684                 return nwc_connect_ip(IO);
 685         }
 686         else
 687                 return eAbort;
 688 }
 689
 690
 691 eNextState nwc_get_one_host_ip(AsyncIO *IO)
 692 {
 693         AsyncNetworker *NW = IO->Data;
 694         /*
 695          * here we start with the lookup of one host.
 696          */
 697
 698         EVN_syslog(LOG_DEBUG, "NWC: %s\n", __FUNCTION__);
 699
 700         EVN_syslog(LOG_DEBUG,
 701                    "NWC client[%ld]: looking up %s-Record %s : %d ...\n",
 702                    NW->n,
 703                    (NW->IO.ConnectMe->IPv6)? "aaaa": "a",
 704                    NW->IO.ConnectMe->Host,
 705                    NW->IO.ConnectMe->Port);
 706
 707         QueueQuery((NW->IO.ConnectMe->IPv6)? ns_t_aaaa : ns_t_a,
 708                    NW->IO.ConnectMe->Host,
 709                    &NW->IO,
 710                    &NW->HostLookup,
 711                    nwc_get_one_host_ip_done);
 712         IO->NextState = eReadDNSReply;
 713         return IO->NextState;
 714 }
 715 /**
 716  * @brief lineread Handler; understands when to read more POP3 lines, and when this is a one-lined reply.
 717  */
 718 eReadState NWC_ReadServerStatus(AsyncIO *IO)
 719 {
 720 //      AsyncNetworker *NW = IO->Data;
 721         eReadState Finished = eBufferNotEmpty;
 722
 723         switch (IO->NextState) {
 724         case eSendDNSQuery:
 725         case eReadDNSReply:
 726         case eDBQuery:
 727         case eConnect:
 728         case eTerminateConnection:
 729         case eAbort:
 730                 Finished = eReadFail;
 731                 break;
 732         case eSendReply:
 733         case eSendMore:
 734         case eReadMore:
 735         case eReadMessage:
 736                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 737                 break;
 738         case eReadFile:
 739         case eSendFile:
 740         case eReadPayload:
 741                 break;
 742         }
 743         return Finished;
 744 }
 745
 746
 747
 748 eNextState NWC_FailNetworkConnection(AsyncIO *IO)
 749 {
 750         return eAbort;
 751 }
 752
 753 void NWC_SetTimeout(eNextState NextTCPState, AsyncNetworker *NW)
 754 {
 755         AsyncIO *IO = &NW->IO;
 756         double Timeout = 0.0;
 757
 758         EVN_syslog(LOG_DEBUG, "%s - %d\n", __FUNCTION__, NextTCPState);
 759
 760         switch (NextTCPState) {
 761         case eSendReply:
 762         case eSendMore:
 763                 break;
 764         case eReadFile:
 765         case eReadMessage:
 766                 Timeout = NWC_ReadTimeouts[NW->State];
 767                 break;
 768         case eReadPayload:
 769                 Timeout = 100000;
 770                 /* TODO!!! */
 771                 break;
 772         case eSendDNSQuery:
 773         case eReadDNSReply:
 774         case eConnect:
 775         case eSendFile:
 776 //TODO
 777         case eTerminateConnection:
 778         case eDBQuery:
 779         case eAbort:
 780         case eReadMore://// TODO
 781                 return;
 782         }
 783         if (Timeout > 0) {
 784                 EVN_syslog(LOG_DEBUG,
 785                            "%s - %d %f\n",
 786                            __FUNCTION__,
 787                            NextTCPState,
 788                            Timeout);
 789                 SetNextTimeout(&NW->IO, Timeout*100);
 790         }
 791 }
 792
 793
 794 eNextState NWC_DispatchReadDone(AsyncIO *IO)
 795 {
 796         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 797         AsyncNetworker *NW = IO->Data;
 798         eNextState rc;
 799
 800         rc = NWC_ReadHandlers[NW->State](NW);
 801         if (rc != eReadMore)
 802                 NW->State++;
 803         NWC_SetTimeout(rc, NW);
 804         return rc;
 805 }
 806 eNextState NWC_DispatchWriteDone(AsyncIO *IO)
 807 {
 808         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 809         AsyncNetworker *NW = IO->Data;
 810         eNextState rc;
 811
 812         rc = NWC_SendHandlers[NW->State](NW);
 813         NWC_SetTimeout(rc, NW);
 814         return rc;
 815 }
 816
 817 /*****************************************************************************/
 818 /*                     Networker CLIENT ERROR CATCHERS                       */
 819 /*****************************************************************************/
 820 eNextState NWC_Terminate(AsyncIO *IO)
 821 {
 822         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 823         FinalizeNetworker(IO);
 824         return eAbort;
 825 }
 826
 827 eNextState NWC_TerminateDB(AsyncIO *IO)
 828 {
 829         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 830         FinalizeNetworker(IO);
 831         return eAbort;
 832 }
 833
 834 eNextState NWC_Timeout(AsyncIO *IO)
 835 {
 836         AsyncNetworker *NW = IO->Data;
 837         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 838
 839         if (NW->IO.ErrMsg == NULL)
 840                 NW->IO.ErrMsg = NewStrBuf();
 841         StrBufPrintf(NW->IO.ErrMsg, "Timeout while talking to %s \r\n", ChrPtr(NW->host));
 842         return NWC_FailNetworkConnection(IO);
 843 }
 844 eNextState NWC_ConnFail(AsyncIO *IO)
 845 {
 846         AsyncNetworker *NW = IO->Data;
 847
 848         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 849         if (NW->IO.ErrMsg == NULL)
 850                 NW->IO.ErrMsg = NewStrBuf();
 851         StrBufPrintf(NW->IO.ErrMsg, "failed to connect %s \r\n", ChrPtr(NW->host));
 852
 853         return NWC_FailNetworkConnection(IO);
 854 }
 855 eNextState NWC_DNSFail(AsyncIO *IO)
 856 {
 857         AsyncNetworker *NW = IO->Data;
 858
 859         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 860         if (NW->IO.ErrMsg == NULL)
 861                 NW->IO.ErrMsg = NewStrBuf();
 862         StrBufPrintf(NW->IO.ErrMsg, "failed to look up %s \r\n", ChrPtr(NW->host));
 863
 864         return NWC_FailNetworkConnection(IO);
 865 }
 866 eNextState NWC_Shutdown(AsyncIO *IO)
 867 {
 868         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 869
 870         FinalizeNetworker(IO);
 871         return eAbort;
 872 }
 873
 874
 875 eNextState nwc_connect_ip(AsyncIO *IO)
 876 {
 877         AsyncNetworker *NW = IO->Data;
 878
 879         EVN_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 880         EVN_syslog(LOG_NOTICE, "Connecting to <%s> at %s:%s\n",
 881                    ChrPtr(NW->node),
 882                    ChrPtr(NW->host),
 883                    ChrPtr(NW->port));
 884
 885         return EvConnectSock(IO,
 886                              NWC_ConnTimeout,
 887                              NWC_ReadTimeouts[0],
 888                              1);
 889 }
 890
 891 static int NetworkerCount = 0;
 892 void RunNetworker(AsyncNetworker *NW)
 893 {
 894         NW->n = NetworkerCount++;
 895         network_talking_to(SKEY(NW->node), NTT_ADD);
 896         syslog(LOG_DEBUG, "NW[%s][%ld]: polling\n", ChrPtr(NW->node), NW->n);
 897         ParseURL(&NW->IO.ConnectMe, NW->Url, 504);
 898
 899         InitIOStruct(&NW->IO,
 900                      NW,
 901                      eReadMessage,
 902                      NWC_ReadServerStatus,
 903                      NWC_DNSFail,
 904                      NWC_DispatchWriteDone,
 905                      NWC_DispatchReadDone,
 906                      NWC_Terminate,
 907                      NWC_TerminateDB,
 908                      NWC_ConnFail,
 909                      NWC_Timeout,
 910                      NWC_Shutdown);
 911
 912         safestrncpy(((CitContext *)NW->IO.CitContext)->cs_host,
 913                     ChrPtr(NW->host),
 914                     sizeof(((CitContext *)NW->IO.CitContext)->cs_host));
 915
 916         if (NW->IO.ConnectMe->IsIP) {
 917                 QueueEventContext(&NW->IO,
 918                                   nwc_connect_ip);
 919         }
 920         else { /* uneducated admin has chosen to add DNS to the equation... */
 921                 QueueEventContext(&NW->IO,
 922                                   nwc_get_one_host_ip);
 923         }
 924 }
 925
 926 /*
 927  * Poll other Citadel nodes and transfer inbound/outbound network data.
 928  * Set "full" to nonzero to force a poll of every node, or to zero to poll
 929  * only nodes to which we have data to send.
 930  */
 931 void network_poll_other_citadel_nodes(int full_poll, HashList *ignetcfg)
 932 {
 933         const char *key;
 934         long len;
 935         HashPos *Pos;
 936         void *vCfg;
 937         AsyncNetworker *NW;
 938         StrBuf *SpoolFileName;
 939
 940         int poll = 0;
 941
 942         if (GetCount(ignetcfg) ==0) {
 943                 syslog(LOG_DEBUG, "network: no neighbor nodes are configured - not polling.\n");
 944                 return;
 945         }
 946         become_session(&networker_client_CC);
 947
 948         SpoolFileName = NewStrBufPlain(ctdl_netout_dir, -1);
 949
 950         Pos = GetNewHashPos(ignetcfg, 0);
 951
 952         while (GetNextHashPos(ignetcfg, Pos, &len, &key, &vCfg))
 953         {
 954                 /* Use the string tokenizer to grab one line at a time */
 955                 if(server_shutting_down)
 956                         return;/* TODO free stuff*/
 957                 NodeConf *pNode = (NodeConf*) vCfg;
 958                 poll = 0;
 959                 NW = (AsyncNetworker*)malloc(sizeof(AsyncNetworker));
 960                 memset(NW, 0, sizeof(AsyncNetworker));
 961
 962                 NW->node = NewStrBufDup(pNode->NodeName);
 963                 NW->host = NewStrBufDup(pNode->Host);
 964                 NW->port = NewStrBufDup(pNode->Port);
 965                 NW->secret = NewStrBufDup(pNode->Secret);
 966
 967                 if ( (StrLength(NW->node) != 0) &&
 968                      (StrLength(NW->secret) != 0) &&
 969                      (StrLength(NW->host) != 0) &&
 970                      (StrLength(NW->port) != 0))
 971                 {
 972                         poll = full_poll;
 973                         if (poll == 0)
 974                         {
 975                                 StrBufAppendBufPlain(SpoolFileName, HKEY("/"), 0);
 976                                 StrBufAppendBuf(SpoolFileName, NW->node, 0);
 977                                 StrBufStripSlashes(SpoolFileName, 1);
 978
 979                                 if (access(ChrPtr(SpoolFileName), R_OK) == 0) {
 980                                         poll = 1;
 981                                 }
 982                         }
 983                 }
 984                 if (poll &&
 985                     (StrLength(NW->host) > 0) &&
 986                     strcmp("0.0.0.0", ChrPtr(NW->host)))
 987                 {
 988                         NW->Url = NewStrBuf();
 989                         StrBufPrintf(NW->Url, "citadel://:%s@%s:%s",
 990                                      ChrPtr(NW->secret),
 991                                      ChrPtr(NW->host),
 992                                      ChrPtr(NW->port));
 993                         if (!network_talking_to(SKEY(NW->node), NTT_CHECK))
 994                         {
 995                                 RunNetworker(NW);
 996                                 continue;
 997                         }
 998                 }
 999                 DeleteNetworker(NW);
1000         }
1001         FreeStrBuf(&SpoolFileName);
1002         DeleteHashPos(&Pos);
1003 }
1004
1005
1006 void network_do_clientqueue(void)
1007 {
1008         HashList *working_ignetcfg;
1009         int full_processing = 1;
1010         static time_t last_run = 0L;
1011
1012         /*
1013          * Run the full set of processing tasks no more frequently
1014          * than once every n seconds
1015          */
1016         if ( (time(NULL) - last_run) < config.c_net_freq ) {
1017                 full_processing = 0;
1018                 syslog(LOG_DEBUG, "Network full processing in %ld seconds.\n",
1019                         config.c_net_freq - (time(NULL)- last_run)
1020                 );
1021         }
1022
1023         working_ignetcfg = load_ignetcfg();
1024         /*
1025          * Poll other Citadel nodes.  Maybe.  If "full_processing" is set
1026          * then we poll everyone.  Otherwise we only poll nodes we have stuff
1027          * to send to.
1028          */
1029         network_poll_other_citadel_nodes(full_processing, working_ignetcfg);
1030         DeleteHash(&working_ignetcfg);
1031 }
1032
1033 void LogDebugEnableNetworkClient(const int n)
1034 {
1035         NetworkClientDebugEnabled = n;
1036 }
1037 /*
1038  * Module entry point
1039  */
1040 CTDL_MODULE_INIT(network_client)
1041 {
1042         if (!threading)
1043         {
1044                 CtdlFillSystemContext(&networker_client_CC, "CitNetworker");
1045
1046                 CtdlRegisterSessionHook(network_do_clientqueue, EVT_TIMER);
1047                 CtdlRegisterDebugFlagHook(HKEY("networkclient"), LogDebugEnableNetworkClient, &NetworkClientDebugEnabled);
1048
1049         }
1050         return "networkclient";
1051 }