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