bebe01120c93037b95f25f9df46266aa58aa088b
[doldaconnect.git] / 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         *size = transfer->endpos - transfer->curpos;
296         buf = srealloc(buf, *size);
297     }
298     transfer->curpos += *size;
299     bytesupload += *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 static int tryreq(struct transfer *transfer)
339 {
340     struct fnetnode *fn;
341     struct fnetpeer *peer;
342     
343     if((fn = transfer->fn) != NULL)
344     {
345         if(fn->state != FNN_EST)
346         {
347             transfer->close = 1;
348             return(1);
349         }
350         peer = fnetfindpeer(fn, transfer->peerid);
351     } else {
352         peer = NULL;
353         for(fn = fnetnodes; fn != NULL; fn = fn->next)
354         {
355             if((fn->state == FNN_EST) && (fn->fnet == transfer->fnet) && ((peer = fnetfindpeer(fn, transfer->peerid)) != NULL))
356                 break;
357         }
358     }
359     if(peer != NULL)
360     {
361         time(&transfer->lastreq);
362         return(fn->fnet->reqconn(peer));
363     }
364     return(1);
365 }
366
367 void trytransferbypeer(struct fnet *fnet, wchar_t *peerid)
368 {
369     struct transfer *transfer;
370     
371     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
372     {
373         if((transfer->dir == TRNSD_DOWN) && (transfer->state == TRNS_WAITING))
374         {
375             if((transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
376             {
377                 if(!tryreq(transfer))
378                     return;
379             }
380         }
381     }
382 }
383
384 void bumptransfer(struct transfer *transfer)
385 {
386     time_t now;
387     
388     if((now = time(NULL)) < transfer->timeout)
389     {
390
391         if(transfer->etimer == NULL)
392             transfer->etimer = timercallback(transfer->timeout, (void (*)(int, void *))transexpire, transfer);
393         return;
394     }
395     if(transfer->etimer != NULL)
396         canceltimer(transfer->etimer);
397     switch(transfer->state)
398     {
399     case TRNS_WAITING:
400         transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 30), (void (*)(int, void *))transexpire, transfer);
401         if(now - transfer->lastreq > 30)
402             tryreq(transfer);
403         break;
404     case TRNS_HS:
405         if(transfer->dir == TRNSD_UP)
406         {
407             if(now - transfer->activity < 60)
408                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
409             else
410                 transfer->close = 1;
411         } else if(transfer->dir == TRNSD_DOWN) {
412             if(now - transfer->activity < 60)
413                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
414             else
415                 resettransfer(transfer);
416         }
417         break;
418     case TRNS_MAIN:
419         if(transfer->dir == TRNSD_UP)
420         {
421             if(now - transfer->activity < 300)
422                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 300), (void (*)(int, void *))transexpire, transfer);
423             else
424                 transfer->close = 1;
425         }
426         break;
427     }
428 }
429
430 void transfersetactivity(struct transfer *transfer, wchar_t *desc)
431 {
432     time(&transfer->activity);
433     if(desc != NULL)
434     {
435         if(transfer->actdesc != NULL)
436             free(transfer->actdesc);
437         transfer->actdesc = swcsdup(desc);
438     }
439     bumptransfer(transfer);
440     CBCHAINDOCB(transfer, trans_act, transfer);
441 }
442
443 void transfersetstate(struct transfer *transfer, int newstate)
444 {
445     transfer->state = newstate;
446     if(transfer->etimer != NULL)
447         canceltimer(transfer->etimer);
448     transfersetactivity(transfer, NULL);
449     CBCHAINDOCB(transfer, trans_ac, transfer, L"state");
450 }
451
452 void transfersetnick(struct transfer *transfer, wchar_t *newnick)
453 {
454     if(transfer->peernick != NULL)
455         free(transfer->peernick);
456     transfer->peernick = swcsdup(newnick);
457     CBCHAINDOCB(transfer, trans_ac, transfer, L"nick");
458 }
459
460 void transfersetsize(struct transfer *transfer, int newsize)
461 {
462     transfer->size = newsize;
463     CBCHAINDOCB(transfer, trans_ac, transfer, L"size");
464 }
465
466 void transferseterror(struct transfer *transfer, int error)
467 {
468     transfer->error = error;
469     CBCHAINDOCB(transfer, trans_ac, transfer, L"error");
470 }
471
472 void transfersetpath(struct transfer *transfer, wchar_t *path)
473 {
474     if(transfer->path != NULL)
475         free(transfer->path);
476     transfer->path = swcsdup(path);
477     CBCHAINDOCB(transfer, trans_ac, transfer, L"path");
478 }
479
480 void transfersethash(struct transfer *transfer, struct hash *hash)
481 {
482     if(transfer->hash != NULL)
483         freehash(transfer->hash);
484     transfer->hash = hash;
485     CBCHAINDOCB(transfer, trans_ac, transfer, L"hash");
486 }
487
488 int slotsleft(void)
489 {
490     struct transfer *transfer;
491     int slots;
492     
493     slots = confgetint("transfer", "slots");
494     for(transfer = transfers; (transfer != NULL) && (slots > 0); transfer = transfer->next)
495     {
496         if((transfer->dir == TRNSD_UP) && (transfer->state == TRNS_MAIN) && !transfer->flags.b.minislot)
497             slots--;
498     }
499     return(slots);
500 }
501
502 static void killfilter(struct transfer *transfer)
503 {
504     if(transfer->filter != -1)
505     {
506         kill(-transfer->filter, SIGHUP);
507         transfer->filter = -1;
508     }
509     if(transfer->localend)
510     {
511         transfer->localend->readcb = NULL;
512         transfer->localend->writecb = NULL;
513         transfer->localend->errcb = NULL;
514         putsock(transfer->localend);
515         transfer->localend = NULL;
516     }
517     if(transfer->filterout)
518     {
519         transfer->filterout->readcb = NULL;
520         putsock(transfer->filterout);
521         transfer->filterout = NULL;
522     }
523     if(transfer->filterbuf)
524     {
525         free(transfer->filterbuf);
526         transfer->filterbuf = NULL;
527     }
528     transfer->filterbufsize = transfer->filterbufdata = 0;
529 }
530
531 static void handletranscmd(struct transfer *transfer, wchar_t *cmd, wchar_t *arg)
532 {
533     if(!wcscmp(cmd, L"status")) {
534         if(arg == NULL)
535             arg = L"";
536         if(transfer->exitstatus != NULL)
537             free(transfer->exitstatus);
538         transfer->exitstatus = swcsdup(arg);
539     }
540 }
541
542 static void filterread(struct socket *sk, struct transfer *transfer)
543 {
544     char *buf, *p, *p2;
545     size_t bufsize;
546     wchar_t *cmd, *arg;
547     
548     if((buf = sockgetinbuf(sk, &bufsize)) == NULL)
549         return;
550     bufcat(transfer->filterbuf, buf, bufsize);
551     free(buf);
552     while((p = memchr(transfer->filterbuf, '\n', transfer->filterbufdata)) != NULL)
553     {
554         *(p++) = 0;
555         if((p2 = strchr(transfer->filterbuf, ' ')) != NULL)
556             *(p2++) = 0;
557         if((cmd = icmbstowcs(transfer->filterbuf, NULL)) != NULL)
558         {
559             arg = NULL;
560             if(p2 != NULL)
561             {
562                 if((arg = icmbstowcs(p2, NULL)) == NULL)
563                     flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", p2, strerror(errno));
564             }
565             handletranscmd(transfer, cmd, arg);
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     struct fnet *fnet;
581     wchar_t *peerid;
582     
583     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
584     {
585         if(transfer->filter == pid)
586         {
587             transfer->filter = -1;
588             killfilter(transfer);
589             fnet = transfer->fnet;
590             peerid = swcsdup(transfer->peerid);
591             if(WEXITSTATUS(status))
592                 resettransfer(transfer);
593             else
594                 freetransfer(transfer);
595             trytransferbypeer(fnet, peerid);
596             free(peerid);
597             break;
598         }
599     }
600 }
601
602 int forkfilter(struct transfer *transfer)
603 {
604     char *filtername, *filename, *peerid, *buf;
605     wchar_t *wfilename;
606     struct passwd *pwent;
607     pid_t pid;
608     int inpipe, outpipe;
609     char **argv;
610     size_t argvsize, argvdata;
611     struct socket *insock, *outsock;
612     struct wcspair *ta;
613     char *rec, *val;
614
615     wfilename = transfer->path;
616     if(transfer->fnet->filebasename != NULL)
617         wfilename = transfer->fnet->filebasename(wfilename);
618     if(transfer->auth == NULL)
619     {
620         flog(LOG_WARNING, "tried to fork filter for transfer with NULL authhandle (tranfer %i)", transfer->id);
621         errno = EACCES;
622         return(-1);
623     }
624     if((pwent = getpwuid(transfer->owner)) == NULL)
625     {
626         flog(LOG_WARNING, "no passwd entry for uid %i (found in transfer %i)", transfer->owner, transfer->id);
627         errno = EACCES;
628         return(-1);
629     }
630     filtername = findfile("dc-filter", pwent->pw_dir, 0);
631     if(filtername == NULL)
632         filtername = findfile(icswcstombs(confgetstr("transfer", "filter"), NULL, NULL), NULL, 0);
633     if(filtername == NULL)
634     {
635         flog(LOG_WARNING, "could not find filter for user %s", pwent->pw_name);
636         errno = ENOENT;
637         return(-1);
638     }
639     if((filename = icwcstombs(wfilename, NULL)) == NULL)
640     {
641         if((buf = icwcstombs(wfilename, "UTF-8")) == NULL)
642         {
643             flog(LOG_WARNING, "could convert transfer filename to neither local charset nor UTF-8: %s", strerror(errno));
644             return(-1);
645         }
646         filename = sprintf2("utf8-%s", buf);
647         free(buf);
648     }
649     if((peerid = icwcstombs(transfer->peerid, NULL)) == NULL)
650     {
651         if((buf = icwcstombs(transfer->peerid, "UTF-8")) == NULL)
652         {
653             flog(LOG_WARNING, "could convert transfer peerid to neither local charset nor UTF-8: %s", strerror(errno));
654             free(filename);
655             return(-1);
656         }
657         peerid = sprintf2("utf8-%s", buf);
658         free(buf);
659     }
660     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)
661     {
662         flog(LOG_WARNING, "could not fork session for filter for transfer %i: %s", transfer->id, strerror(errno));
663         return(-1);
664     }
665     if(pid == 0)
666     {
667         argv = NULL;
668         argvsize = argvdata = 0;
669         buf = sprintf2("%zi", transfer->size);
670         addtobuf(argv, filtername);
671         addtobuf(argv, filename);
672         addtobuf(argv, buf);
673         addtobuf(argv, peerid);
674         if(transfer->hash)
675         {
676             if((buf = icwcstombs(unparsehash(transfer->hash), NULL)) != NULL)
677             {
678                 /* XXX: I am very doubtful of this, but it can just as
679                  * well be argued that all data should be presented as
680                  * key-value pairs. */
681                 addtobuf(argv, "hash");
682                 addtobuf(argv, buf);
683             } else {
684                 flog(LOG_WARNING, "could not convert hash to local charset");
685             }
686         }
687         for(ta = transfer->args; ta != NULL; ta = ta->next)
688         {
689             if((rec = icwcstombs(ta->key, NULL)) == NULL)
690                 continue;
691             if((val = icwcstombs(ta->val, NULL)) == NULL)
692                 continue;
693             addtobuf(argv, rec);
694             addtobuf(argv, val);
695         }
696         addtobuf(argv, NULL);
697         execv(filtername, argv);
698         flog(LOG_WARNING, "could not exec filter %s: %s", filtername, strerror(errno));
699         exit(127);
700     }
701     insock = wrapsock(inpipe);
702     outsock = wrapsock(outpipe);
703     /* Really, really strange thing here - sometimes the kernel would
704      * return POLLIN on insock, even though it's a write-side
705      * pipe. The corresponding read on the pipe naturally returns
706      * EBADF, causing doldacond to think there's something wrong with
707      * the fd, and thus it closes it. Until I can find out whyever the
708      * kernel gives a POLLIN on the fd (if I can at all...), I'll just
709      * set ignread on insock for now. */
710     insock->ignread = 1;
711     transfer->filter = pid;
712     transfersetlocalend(transfer, insock);
713     getsock(transfer->filterout = outsock);
714     outsock->data = transfer;
715     outsock->readcb = (void (*)(struct socket *, void *))filterread;
716     putsock(insock);
717     putsock(outsock);
718     free(filtername);
719     free(filename);
720     free(peerid);
721     return(0);
722 }
723
724 static int run(void)
725 {
726     struct transfer *transfer, *next;
727     
728     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
729     {
730         if((transfer->endpos >= 0) && (transfer->state == TRNS_MAIN) && (transfer->localend != NULL) && (transfer->localend->state == SOCK_EST) && (transfer->curpos >= transfer->endpos))
731         {
732             if((transfer->iface != NULL) && (transfer->iface->endofdata != NULL))
733                 transfer->iface->endofdata(transfer, transfer->ifacedata);
734             closesock(transfer->localend);
735         }
736     }
737     for(transfer = transfers; transfer != NULL; transfer = next)
738     {
739         next = transfer->next;
740         if(transfer->close)
741         {
742             transferdetach(transfer);
743             freetransfer(transfer);
744             continue;
745         }
746     }
747     return(0);
748 }
749
750 static struct configvar myvars[] =
751 {
752     /** The maximum number of simultaneously permitted uploads. A
753      * common hub rule is that you will need at least as many slots as
754      * the number of hubs to which you are connected. */
755     {CONF_VAR_INT, "slots", {.num = 3}},
756     /** The TOS value to use for upload connections (see the TOS
757      * VALUES section). */
758     {CONF_VAR_INT, "ultos", {.num = SOCK_TOS_MAXTP}},
759     /** The TOS value to use for download connections (see the TOS
760      * VALUES section). */
761     {CONF_VAR_INT, "dltos", {.num = SOCK_TOS_MAXTP}},
762     /** The name of the filter script (see the FILES section for
763      * lookup information). */
764     {CONF_VAR_STRING, "filter", {.str = L"dc-filter"}},
765     /** If true, only one upload is allowed per remote peer. This
766      * option is still experimental, so it is recommended to leave it
767      * off. */
768     {CONF_VAR_BOOL, "ulquota", {.num = 0}},
769     {CONF_VAR_END}
770 };
771
772 static struct module me =
773 {
774     .conf =
775     {
776         .vars = myvars
777     },
778     .name = "transfer",
779     .run = run
780 };
781
782 MODULE(me);