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