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