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