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