daemon/transfer.c

   1 /*
   2  *  Dolda Connect - Modular multiuser Direct Connect-style client
   3  *  Copyright (C) 2004 Fredrik Tolf (fredrik@dolda2000.com)
   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 2 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 #include <stdlib.h>
  20 #include <string.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <signal.h>
  25 #include <pwd.h>
  26 #include <grp.h>
  27 #include <errno.h>
  28 #include <sys/wait.h>
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include <config.h>
  32 #endif
  33 #include "log.h"
  34 #include "utils.h"
  35 #include "sysevents.h"
  36 #include "auth.h"
  37 #include "transfer.h"
  38 #include "module.h"
  39 #include "client.h"
  40
  41 static void killfilter(struct transfer *transfer);
  42
  43 unsigned long long bytesupload = 0;
  44 unsigned long long bytesdownload = 0;
  45 struct transfer *transfers = NULL;
  46 int numtransfers = 0;
  47 GCBCHAIN(newtransfercb, struct transfer *);
  48
  49 void freetransfer(struct transfer *transfer)
  50 {
  51     if(transfer == transfers)
  52         transfers = transfer->next;
  53     if(transfer->next != NULL)
  54         transfer->next->prev = transfer->prev;
  55     if(transfer->prev != NULL)
  56         transfer->prev->next = transfer->next;
  57     CBCHAINDOCB(transfer, trans_destroy, transfer);
  58     CBCHAINFREE(transfer, trans_ac);
  59     CBCHAINFREE(transfer, trans_act);
  60     CBCHAINFREE(transfer, trans_p);
  61     CBCHAINFREE(transfer, trans_destroy);
  62     CBCHAINFREE(transfer, trans_filterout);
  63     while(transfer->args != NULL)
  64         freewcspair(transfer->args, &transfer->args);
  65     if(transfer->filter != -1)
  66         killfilter(transfer);
  67     if(transfer->etimer != NULL)
  68         canceltimer(transfer->etimer);
  69     if(transfer->auth != NULL)
  70         authputhandle(transfer->auth);
  71     if(transfer->peerid != NULL)
  72         free(transfer->peerid);
  73     if(transfer->peernick != NULL)
  74         free(transfer->peernick);
  75     if(transfer->path != NULL)
  76         free(transfer->path);
  77     if(transfer->actdesc != NULL)
  78         free(transfer->actdesc);
  79     if(transfer->filterbuf != NULL)
  80         free(transfer->filterbuf);
  81     if(transfer->hash != NULL)
  82         freehash(transfer->hash);
  83     if(transfer->exitstatus != NULL)
  84         free(transfer->exitstatus);
  85     if(transfer->localend != NULL)
  86     {
  87         transfer->localend->readcb = NULL;
  88         transfer->localend->writecb = NULL;
  89         transfer->localend->errcb = NULL;
  90         putsock(transfer->localend);
  91     }
  92     if(transfer->filterout != NULL)
  93     {
  94         transfer->filterout->readcb = NULL;
  95         transfer->filterout->writecb = NULL;
  96         transfer->filterout->errcb = NULL;
  97         putsock(transfer->filterout);
  98     }
  99     if(transfer->fn != NULL)
 100         putfnetnode(transfer->fn);
 101     free(transfer);
 102     numtransfers--;
 103 }
 104
 105 struct transfer *newtransfer(void)
 106 {
 107     struct transfer *new;
 108     static int curid = 0;
 109
 110     new = smalloc(sizeof(*new));
 111     memset(new, 0, sizeof(*new));
 112     new->id = curid++;
 113     new->size = -1;
 114     new->endpos = -1;
 115     new->filter = -1;
 116     CBCHAININIT(new, trans_ac);
 117     CBCHAININIT(new, trans_act);
 118     CBCHAININIT(new, trans_p);
 119     CBCHAININIT(new, trans_destroy);
 120     CBCHAININIT(new, trans_filterout);
 121     new->next = NULL;
 122     new->prev = NULL;
 123     time(&new->activity);
 124     numtransfers++;
 125     return(new);
 126 }
 127
 128 void transferattach(struct transfer *transfer, struct transferiface *iface, void *data)
 129 {
 130     if(transfer->iface != NULL)
 131         transferdetach(transfer);
 132     transfer->iface = iface;
 133     transfer->ifacedata = data;
 134 }
 135
 136 void transferdetach(struct transfer *transfer)
 137 {
 138     if(transfer->iface != NULL)
 139     {
 140         transfer->iface->detach(transfer, transfer->ifacedata);
 141         transfer->iface = NULL;
 142         transfer->ifacedata = NULL;
 143     }
 144 }
 145
 146 struct transfer *finddownload(wchar_t *peerid)
 147 {
 148     struct transfer *transfer;
 149
 150     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 151     {
 152         if((transfer->dir == TRNSD_DOWN) && (transfer->iface == NULL) && !wcscmp(peerid, transfer->peerid))
 153             break;
 154     }
 155     return(transfer);
 156 }
 157
 158 struct transfer *newupload(struct fnetnode *fn, struct fnet *fnet, wchar_t *nickid, struct transferiface *iface, void *data)
 159 {
 160     struct transfer *transfer;
 161
 162     transfer = newtransfer();
 163     if(fnet != NULL)
 164         transfer->fnet = fnet;
 165     else
 166         transfer->fnet = fn->fnet;
 167     transfer->peerid = swcsdup(nickid);
 168     transfer->state = TRNS_HS;
 169     transfer->dir = TRNSD_UP;
 170     if(fn != NULL)
 171         getfnetnode(transfer->fn = fn);
 172     transferattach(transfer, iface, data);
 173     linktransfer(transfer);
 174     bumptransfer(transfer);
 175     return(transfer);
 176 }
 177
 178 void linktransfer(struct transfer *transfer)
 179 {
 180     transfer->next = transfers;
 181     transfer->prev = NULL;
 182     if(transfers != NULL)
 183         transfers->prev = transfer;
 184     transfers = transfer;
 185     GCBCHAINDOCB(newtransfercb, transfer);
 186 }
 187
 188 void resettransfer(struct transfer *transfer)
 189 {
 190     if(transfer->dir == TRNSD_DOWN)
 191     {
 192         if(transfer->iface != NULL)
 193             transferdetach(transfer);
 194         killfilter(transfer);
 195         transfersetstate(transfer, TRNS_WAITING);
 196         transfersetactivity(transfer, L"reset");
 197         return;
 198     }
 199 }
 200
 201 struct transfer *findtransfer(int id)
 202 {
 203     struct transfer *transfer;
 204
 205     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 206     {
 207         if(transfer->id == id)
 208             break;
 209     }
 210     return(transfer);
 211 }
 212
 213 static void transexpire(int cancelled, struct transfer *transfer)
 214 {
 215     transfer->etimer = NULL;
 216     if(!cancelled)
 217         bumptransfer(transfer);
 218     else
 219         transfer->timeout = 0;
 220 }
 221
 222 static void transferread(struct socket *sk, struct transfer *transfer)
 223 {
 224     if(sockgetdatalen(sk) >= 65536)
 225         sk->ignread = 1;
 226     if((transfer->iface != NULL) && (transfer->iface->gotdata != NULL))
 227         transfer->iface->gotdata(transfer, transfer->ifacedata);
 228 }
 229
 230 static void transferwrite(struct socket *sk, struct transfer *transfer)
 231 {
 232     if((transfer->iface != NULL) && (transfer->iface->wantdata != NULL))
 233         transfer->iface->wantdata(transfer, transfer->ifacedata);
 234 }
 235
 236 static void transfererr(struct socket *sk, int errno, struct transfer *transfer)
 237 {
 238     if((transfer->iface != NULL) && (transfer->iface->endofdata != NULL))
 239         transfer->iface->endofdata(transfer, transfer->ifacedata);
 240 }
 241
 242 void transferputdata(struct transfer *transfer, void *buf, size_t size)
 243 {
 244     time(&transfer->activity);
 245     sockqueue(transfer->localend, buf, size);
 246     transfer->curpos += size;
 247     bytesdownload += size;
 248     CBCHAINDOCB(transfer, trans_p, transfer);
 249 }
 250
 251 void transferendofdata(struct transfer *transfer)
 252 {
 253     if(transfer->curpos >= transfer->size)
 254     {
 255         transfersetstate(transfer, TRNS_DONE);
 256         transfer->localend->readcb = NULL;
 257         transfer->localend->writecb = NULL;
 258         transfer->localend->errcb = NULL;
 259         putsock(transfer->localend);
 260         transfer->localend = NULL;
 261     } else {
 262         resettransfer(transfer);
 263     }
 264 }
 265
 266 size_t transferdatasize(struct transfer *transfer)
 267 {
 268     return(sockqueuesize(transfer->localend));
 269 }
 270
 271 void *transfergetdata(struct transfer *transfer, size_t *size)
 272 {
 273     void *buf;
 274
 275     if(transfer->localend == NULL)
 276         return(NULL);
 277     transfer->localend->ignread = 0;
 278     time(&transfer->activity);
 279     if((buf = sockgetinbuf(transfer->localend, size)) == NULL)
 280         return(NULL);
 281     if((transfer->endpos >= 0) && (transfer->curpos + *size >= transfer->endpos))
 282     {
 283         *size = transfer->endpos - transfer->curpos;
 284         buf = srealloc(buf, *size);
 285     }
 286     transfer->curpos += *size;
 287     bytesupload += *size;
 288     CBCHAINDOCB(transfer, trans_p, transfer);
 289     return(buf);
 290 }
 291
 292 void transferprepul(struct transfer *transfer, size_t size, size_t start, size_t end, struct socket *lesk)
 293 {
 294     transfersetsize(transfer, size);
 295     transfer->curpos = start;
 296     transfer->endpos = end;
 297     lesk->ignread = 1;
 298     transfersetlocalend(transfer, lesk);
 299 }
 300
 301 void transferstartdl(struct transfer *transfer, struct socket *sk)
 302 {
 303     transfersetstate(transfer, TRNS_MAIN);
 304     socksettos(sk, confgetint("transfer", "dltos"));
 305 }
 306
 307 void transferstartul(struct transfer *transfer, struct socket *sk)
 308 {
 309     transfersetstate(transfer, TRNS_MAIN);
 310     socksettos(sk, confgetint("transfer", "ultos"));
 311     if(transfer->localend != NULL)
 312         transfer->localend->ignread = 0;
 313 }
 314
 315 void transfersetlocalend(struct transfer *transfer, struct socket *sk)
 316 {
 317     if(transfer->localend != NULL)
 318         putsock(transfer->localend);
 319     getsock(transfer->localend = sk);
 320     sk->data = transfer;
 321     sk->readcb = (void (*)(struct socket *, void *))transferread;
 322     sk->writecb = (void (*)(struct socket *, void *))transferwrite;
 323     sk->errcb = (void (*)(struct socket *, int, void *))transfererr;
 324 }
 325
 326 static int tryreq(struct transfer *transfer)
 327 {
 328     struct fnetnode *fn;
 329     struct fnetpeer *peer;
 330
 331     if((fn = transfer->fn) != NULL)
 332     {
 333         if(fn->state != FNN_EST)
 334         {
 335             transfer->close = 1;
 336             return(1);
 337         }
 338         peer = fnetfindpeer(fn, transfer->peerid);
 339     } else {
 340         peer = NULL;
 341         for(fn = fnetnodes; fn != NULL; fn = fn->next)
 342         {
 343             if((fn->state == FNN_EST) && (fn->fnet == transfer->fnet) && ((peer = fnetfindpeer(fn, transfer->peerid)) != NULL))
 344                 break;
 345         }
 346     }
 347     if(peer != NULL)
 348     {
 349         time(&transfer->lastreq);
 350         return(fn->fnet->reqconn(peer));
 351     }
 352     return(1);
 353 }
 354
 355 void trytransferbypeer(struct fnet *fnet, wchar_t *peerid)
 356 {
 357     struct transfer *transfer;
 358
 359     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 360     {
 361         if((transfer->dir == TRNSD_DOWN) && (transfer->state == TRNS_WAITING))
 362         {
 363             if((transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
 364             {
 365                 if(!tryreq(transfer))
 366                     return;
 367             }
 368         }
 369     }
 370 }
 371
 372 void bumptransfer(struct transfer *transfer)
 373 {
 374     time_t now;
 375
 376     if((now = time(NULL)) < transfer->timeout)
 377     {
 378
 379         if(transfer->etimer == NULL)
 380             transfer->etimer = timercallback(transfer->timeout, (void (*)(int, void *))transexpire, transfer);
 381         return;
 382     }
 383     if(transfer->etimer != NULL)
 384         canceltimer(transfer->etimer);
 385     switch(transfer->state)
 386     {
 387     case TRNS_WAITING:
 388         transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 30), (void (*)(int, void *))transexpire, transfer);
 389         if(now - transfer->lastreq > 30)
 390             tryreq(transfer);
 391         break;
 392     case TRNS_HS:
 393         if(transfer->dir == TRNSD_UP)
 394         {
 395             if(now - transfer->activity < 60)
 396                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 397             else
 398                 transfer->close = 1;
 399         } else if(transfer->dir == TRNSD_DOWN) {
 400             if(now - transfer->activity < 60)
 401                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
 402             else
 403                 resettransfer(transfer);
 404         }
 405         break;
 406     case TRNS_MAIN:
 407         if(transfer->dir == TRNSD_UP)
 408         {
 409             if(now - transfer->activity < 300)
 410                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 300), (void (*)(int, void *))transexpire, transfer);
 411             else
 412                 transfer->close = 1;
 413         }
 414         break;
 415     }
 416 }
 417
 418 void transfersetactivity(struct transfer *transfer, wchar_t *desc)
 419 {
 420     time(&transfer->activity);
 421     if(desc != NULL)
 422     {
 423         if(transfer->actdesc != NULL)
 424             free(transfer->actdesc);
 425         transfer->actdesc = swcsdup(desc);
 426     }
 427     bumptransfer(transfer);
 428     CBCHAINDOCB(transfer, trans_act, transfer);
 429 }
 430
 431 void transfersetstate(struct transfer *transfer, int newstate)
 432 {
 433     transfer->state = newstate;
 434     if(transfer->etimer != NULL)
 435         canceltimer(transfer->etimer);
 436     transfersetactivity(transfer, NULL);
 437     CBCHAINDOCB(transfer, trans_ac, transfer, L"state");
 438 }
 439
 440 void transfersetnick(struct transfer *transfer, wchar_t *newnick)
 441 {
 442     if(transfer->peernick != NULL)
 443         free(transfer->peernick);
 444     transfer->peernick = swcsdup(newnick);
 445     CBCHAINDOCB(transfer, trans_ac, transfer, L"nick");
 446 }
 447
 448 void transfersetsize(struct transfer *transfer, int newsize)
 449 {
 450     transfer->size = newsize;
 451     CBCHAINDOCB(transfer, trans_ac, transfer, L"size");
 452 }
 453
 454 void transferseterror(struct transfer *transfer, int error)
 455 {
 456     transfer->error = error;
 457     CBCHAINDOCB(transfer, trans_ac, transfer, L"error");
 458 }
 459
 460 void transfersetpath(struct transfer *transfer, wchar_t *path)
 461 {
 462     if(transfer->path != NULL)
 463         free(transfer->path);
 464     transfer->path = swcsdup(path);
 465     CBCHAINDOCB(transfer, trans_ac, transfer, L"path");
 466 }
 467
 468 void transfersethash(struct transfer *transfer, struct hash *hash)
 469 {
 470     if(transfer->hash != NULL)
 471         freehash(transfer->hash);
 472     transfer->hash = hash;
 473     CBCHAINDOCB(transfer, trans_ac, transfer, L"hash");
 474 }
 475
 476 int slotsleft(void)
 477 {
 478     struct transfer *transfer;
 479     int slots;
 480
 481     slots = confgetint("transfer", "slots");
 482     for(transfer = transfers; (transfer != NULL) && (slots > 0); transfer = transfer->next)
 483     {
 484         if((transfer->dir == TRNSD_UP) && (transfer->state == TRNS_MAIN) && !transfer->flags.b.minislot)
 485             slots--;
 486     }
 487     return(slots);
 488 }
 489
 490 static void killfilter(struct transfer *transfer)
 491 {
 492     if(transfer->filter != -1)
 493     {
 494         kill(-transfer->filter, SIGHUP);
 495         transfer->filter = -1;
 496     }
 497     if(transfer->localend)
 498     {
 499         transfer->localend->readcb = NULL;
 500         transfer->localend->writecb = NULL;
 501         transfer->localend->errcb = NULL;
 502         putsock(transfer->localend);
 503         transfer->localend = NULL;
 504     }
 505     if(transfer->filterout)
 506     {
 507         transfer->filterout->readcb = NULL;
 508         putsock(transfer->filterout);
 509         transfer->filterout = NULL;
 510     }
 511     if(transfer->filterbuf)
 512     {
 513         free(transfer->filterbuf);
 514         transfer->filterbuf = NULL;
 515     }
 516     transfer->filterbufsize = transfer->filterbufdata = 0;
 517 }
 518
 519 static char *findfilter(struct passwd *pwd)
 520 {
 521     char *path, *filtername;
 522
 523     if((path = sprintf2("%s/.dcdl-filter", pwd->pw_dir)) != NULL)
 524     {
 525         if(!access(path, X_OK))
 526             return(path);
 527         free(path);
 528     }
 529     if((filtername = icwcstombs(confgetstr("transfer", "filter"), NULL)) == NULL)
 530     {
 531         flog(LOG_WARNING, "could not convert filter name into local charset: %s", strerror(errno));
 532     } else {
 533         if(strchr(filtername, '/') == NULL)
 534         {
 535             if((path = sprintf2("/etc/%s", filtername)) != NULL)
 536             {
 537                 if(!access(path, X_OK))
 538                 {
 539                     free(filtername);
 540                     return(path);
 541                 }
 542                 free(path);
 543             }
 544             if((path = sprintf2("/usr/etc/%s", filtername)) != NULL)
 545             {
 546                 if(!access(path, X_OK))
 547                 {
 548                     free(filtername);
 549                     return(path);
 550                 }
 551                 free(path);
 552             }
 553             if((path = sprintf2("/usr/local/etc/%s", filtername)) != NULL)
 554             {
 555                 if(!access(path, X_OK))
 556                 {
 557                     free(filtername);
 558                     return(path);
 559                 }
 560                 free(path);
 561             }
 562         } else {
 563             if(!access(filtername, X_OK))
 564                 return(filtername);
 565         }
 566         free(filtername);
 567     }
 568     return(NULL);
 569 }
 570
 571 static void handletranscmd(struct transfer *transfer, wchar_t *cmd, wchar_t *arg)
 572 {
 573     if(!wcscmp(cmd, L"status")) {
 574         if(arg == NULL)
 575             arg = L"";
 576         if(transfer->exitstatus != NULL)
 577             free(transfer->exitstatus);
 578         transfer->exitstatus = swcsdup(arg);
 579     }
 580 }
 581
 582 static void filterread(struct socket *sk, struct transfer *transfer)
 583 {
 584     char *buf, *p, *p2;
 585     size_t bufsize;
 586     wchar_t *cmd, *arg;
 587
 588     if((buf = sockgetinbuf(sk, &bufsize)) == NULL)
 589         return;
 590     bufcat(transfer->filterbuf, buf, bufsize);
 591     free(buf);
 592     while((p = memchr(transfer->filterbuf, '\n', transfer->filterbufdata)) != NULL)
 593     {
 594         *(p++) = 0;
 595         if((p2 = strchr(transfer->filterbuf, ' ')) != NULL)
 596             *(p2++) = 0;
 597         if((cmd = icmbstowcs(transfer->filterbuf, NULL)) != NULL)
 598         {
 599             arg = NULL;
 600             if(p2 != NULL)
 601             {
 602                 if((arg = icmbstowcs(p2, NULL)) == NULL)
 603                     flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", p2, strerror(errno));
 604             }
 605             handletranscmd(transfer, cmd, arg);
 606             CBCHAINDOCB(transfer, trans_filterout, transfer, cmd, arg);
 607             if(arg != NULL)
 608                 free(arg);
 609             free(cmd);
 610         } else {
 611             flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", transfer->filterbuf, strerror(errno));
 612         }
 613         memmove(transfer->filterbuf, p, transfer->filterbufdata -= (p - transfer->filterbuf));
 614     }
 615 }
 616
 617 static void filterexit(pid_t pid, int status, void *data)
 618 {
 619     struct transfer *transfer;
 620
 621     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 622     {
 623         if(transfer->filter == pid)
 624         {
 625             transfer->filter = -1;
 626             killfilter(transfer);
 627             if(WEXITSTATUS(status))
 628             {
 629                 resettransfer(transfer);
 630             } else {
 631                 freetransfer(transfer);
 632             }
 633             trytransferbypeer(transfer->fnet, transfer->peerid);
 634             break;
 635         }
 636     }
 637 }
 638
 639 int forkfilter(struct transfer *transfer)
 640 {
 641     char *filtername, *filename, *peerid, *buf;
 642     wchar_t *wfilename;
 643     struct passwd *pwent;
 644     pid_t pid;
 645     int inpipe, outpipe;
 646     char **argv;
 647     size_t argvsize, argvdata;
 648     struct socket *insock, *outsock;
 649     struct wcspair *ta;
 650     char *rec, *val;
 651
 652     wfilename = transfer->path;
 653     if(transfer->fnet->filebasename != NULL)
 654         wfilename = transfer->fnet->filebasename(wfilename);
 655     if(transfer->auth == NULL)
 656     {
 657         flog(LOG_WARNING, "tried to fork filter for transfer with NULL authhandle (tranfer %i)", transfer->id);
 658         errno = EACCES;
 659         return(-1);
 660     }
 661     if((pwent = getpwuid(transfer->owner)) == NULL)
 662     {
 663         flog(LOG_WARNING, "no passwd entry for uid %i (found in transfer %i)", transfer->owner, transfer->id);
 664         errno = EACCES;
 665         return(-1);
 666     }
 667     if((filtername = findfilter(pwent)) == NULL)
 668     {
 669         flog(LOG_WARNING, "could not find filter for user %s", pwent->pw_name);
 670         errno = ENOENT;
 671         return(-1);
 672     }
 673     if((filename = icwcstombs(wfilename, NULL)) == NULL)
 674     {
 675         if((buf = icwcstombs(wfilename, "UTF-8")) == NULL)
 676         {
 677             flog(LOG_WARNING, "could convert transfer filename to neither local charset nor UTF-8: %s", strerror(errno));
 678             return(-1);
 679         }
 680         filename = sprintf2("utf8-%s", buf);
 681         free(buf);
 682     }
 683     if((peerid = icwcstombs(transfer->peerid, NULL)) == NULL)
 684     {
 685         if((buf = icwcstombs(transfer->peerid, "UTF-8")) == NULL)
 686         {
 687             flog(LOG_WARNING, "could convert transfer peerid to neither local charset nor UTF-8: %s", strerror(errno));
 688             free(filename);
 689             return(-1);
 690         }
 691         peerid = sprintf2("utf8-%s", buf);
 692         free(buf);
 693     }
 694     if((pid = forksess(transfer->owner, transfer->auth, filterexit, NULL, FD_PIPE, 0, O_WRONLY, &inpipe, FD_PIPE, 1, O_RDONLY, &outpipe, FD_FILE, 2, O_RDWR, "/dev/null", FD_END)) < 0)
 695     {
 696         flog(LOG_WARNING, "could not fork session for filter for transfer %i: %s", transfer->id, strerror(errno));
 697         return(-1);
 698     }
 699     if(pid == 0)
 700     {
 701         argv = NULL;
 702         argvsize = argvdata = 0;
 703         buf = sprintf2("%i", transfer->size);
 704         addtobuf(argv, filtername);
 705         addtobuf(argv, filename);
 706         addtobuf(argv, buf);
 707         addtobuf(argv, peerid);
 708         if(transfer->hash)
 709         {
 710             if((buf = icwcstombs(unparsehash(transfer->hash), NULL)) != NULL)
 711             {
 712                 /* XXX: I am very doubtful of this, but it can just as
 713                  * well be argued that all data should be presented as
 714                  * key-value pairs. */
 715                 addtobuf(argv, "hash");
 716                 addtobuf(argv, buf);
 717             } else {
 718                 flog(LOG_WARNING, "could not convert hash to local charset");
 719             }
 720         }
 721         for(ta = transfer->args; ta != NULL; ta = ta->next)
 722         {
 723             if((rec = icwcstombs(ta->key, NULL)) == NULL)
 724                 continue;
 725             if((val = icwcstombs(ta->val, NULL)) == NULL)
 726                 continue;
 727             addtobuf(argv, rec);
 728             addtobuf(argv, val);
 729         }
 730         addtobuf(argv, NULL);
 731         execv(filtername, argv);
 732         flog(LOG_WARNING, "could not exec filter %s: %s", filtername, strerror(errno));
 733         exit(127);
 734     }
 735     insock = wrapsock(inpipe);
 736     outsock = wrapsock(outpipe);
 737     /* Really, really strange thing here - sometimes the kernel would
 738      * return POLLIN on insock, even though it's a write-side
 739      * pipe. The corresponding read on the pipe naturally returns
 740      * EBADF, causing doldacond to think there's something wrong with
 741      * the fd, and thus it closes it. Until I can find out whyever the
 742      * kernel gives a POLLIN on the fd (if I can at all...), I'll just
 743      * set ignread on insock for now. */
 744     insock->ignread = 1;
 745     transfer->filter = pid;
 746     transfersetlocalend(transfer, insock);
 747     getsock(transfer->filterout = outsock);
 748     outsock->data = transfer;
 749     outsock->readcb = (void (*)(struct socket *, void *))filterread;
 750     putsock(insock);
 751     putsock(outsock);
 752     free(filtername);
 753     free(filename);
 754     free(peerid);
 755     return(0);
 756 }
 757
 758 static int run(void)
 759 {
 760     struct transfer *transfer, *next;
 761
 762     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
 763     {
 764         if((transfer->endpos >= 0) && (transfer->state == TRNS_MAIN) && (transfer->localend != NULL) && (transfer->localend->state == SOCK_EST) && (transfer->curpos >= transfer->endpos))
 765         {
 766             if((transfer->iface != NULL) && (transfer->iface->endofdata != NULL))
 767                 transfer->iface->endofdata(transfer, transfer->ifacedata);
 768             closesock(transfer->localend);
 769         }
 770     }
 771     for(transfer = transfers; transfer != NULL; transfer = next)
 772     {
 773         next = transfer->next;
 774         if(transfer->close)
 775         {
 776             transferdetach(transfer);
 777             freetransfer(transfer);
 778             continue;
 779         }
 780     }
 781     return(0);
 782 }
 783
 784 static struct configvar myvars[] =
 785 {
 786     {CONF_VAR_INT, "slots", {.num = 3}},
 787     {CONF_VAR_INT, "ultos", {.num = SOCK_TOS_MAXTP}},
 788     {CONF_VAR_INT, "dltos", {.num = SOCK_TOS_MAXTP}},
 789     {CONF_VAR_STRING, "filter", {.str = L"dc-filter"}},
 790     {CONF_VAR_END}
 791 };
 792
 793 static struct module me =
 794 {
 795     .conf =
 796     {
 797         .vars = myvars
 798     },
 799     .name = "transfer",
 800     .run = run
 801 };
 802
 803 MODULE(me);