e2fe54ec21e0f762a8d995b3f831fffed79a7f78
[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         if((*size = transfer->endpos - transfer->curpos) == 0) {
296             free(buf);
297             buf = NULL;
298         } else {
299             buf = srealloc(buf, *size);
300         }
301     }
302     transfer->curpos += *size;
303     bytesupload += *size;
304     CBCHAINDOCB(transfer, trans_p, transfer);
305     return(buf);
306 }
307
308 void transferprepul(struct transfer *transfer, size_t size, size_t start, size_t end, struct socket *lesk)
309 {
310     transfersetsize(transfer, size);
311     transfer->curpos = start;
312     transfer->endpos = end;
313     lesk->ignread = 1;
314     transfersetlocalend(transfer, lesk);
315 }
316
317 void transferstartdl(struct transfer *transfer, struct socket *sk)
318 {
319     transfersetstate(transfer, TRNS_MAIN);
320     socksettos(sk, confgetint("transfer", "dltos"));
321 }
322
323 void transferstartul(struct transfer *transfer, struct socket *sk)
324 {
325     transfersetstate(transfer, TRNS_MAIN);
326     socksettos(sk, confgetint("transfer", "ultos"));
327     if(transfer->localend != NULL)
328         transfer->localend->ignread = 0;
329 }
330
331 void transfersetlocalend(struct transfer *transfer, struct socket *sk)
332 {
333     if(transfer->localend != NULL)
334         putsock(transfer->localend);
335     getsock(transfer->localend = sk);
336     sk->data = transfer;
337     sk->readcb = (void (*)(struct socket *, void *))transferread;
338     sk->writecb = (void (*)(struct socket *, void *))transferwrite;
339     sk->errcb = (void (*)(struct socket *, int, void *))transfererr;
340 }
341
342 static int tryreq(struct transfer *transfer)
343 {
344     struct fnetnode *fn;
345     struct fnetpeer *peer;
346     
347     if((fn = transfer->fn) != NULL)
348     {
349         if(fn->state != FNN_EST)
350         {
351             transfer->close = 1;
352             return(1);
353         }
354         peer = fnetfindpeer(fn, transfer->peerid);
355     } else {
356         peer = NULL;
357         for(fn = fnetnodes; fn != NULL; fn = fn->next)
358         {
359             if((fn->state == FNN_EST) && (fn->fnet == transfer->fnet) && ((peer = fnetfindpeer(fn, transfer->peerid)) != NULL))
360                 break;
361         }
362     }
363     if(peer != NULL)
364     {
365         time(&transfer->lastreq);
366         return(fn->fnet->reqconn(peer));
367     }
368     return(1);
369 }
370
371 void trytransferbypeer(struct fnet *fnet, wchar_t *peerid)
372 {
373     struct transfer *transfer;
374     
375     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
376     {
377         if((transfer->dir == TRNSD_DOWN) && (transfer->state == TRNS_WAITING))
378         {
379             if((transfer->fnet == fnet) && !wcscmp(transfer->peerid, peerid))
380             {
381                 if(!tryreq(transfer))
382                     return;
383             }
384         }
385     }
386 }
387
388 void bumptransfer(struct transfer *transfer)
389 {
390     time_t now;
391     
392     if((now = time(NULL)) < transfer->timeout)
393     {
394
395         if(transfer->etimer == NULL)
396             transfer->etimer = timercallback(transfer->timeout, (void (*)(int, void *))transexpire, transfer);
397         return;
398     }
399     if(transfer->etimer != NULL)
400         canceltimer(transfer->etimer);
401     switch(transfer->state)
402     {
403     case TRNS_WAITING:
404         transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 30), (void (*)(int, void *))transexpire, transfer);
405         if(now - transfer->lastreq > 30)
406             tryreq(transfer);
407         break;
408     case TRNS_HS:
409         if(transfer->dir == TRNSD_UP)
410         {
411             if(now - transfer->activity < 60)
412                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
413             else
414                 transfer->close = 1;
415         } else if(transfer->dir == TRNSD_DOWN) {
416             if(now - transfer->activity < 60)
417                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 60), (void (*)(int, void *))transexpire, transfer);
418             else
419                 resettransfer(transfer);
420         }
421         break;
422     case TRNS_MAIN:
423         if(transfer->dir == TRNSD_UP)
424         {
425             if(now - transfer->activity < 300)
426                 transfer->etimer = timercallback(transfer->timeout = (time(NULL) + 300), (void (*)(int, void *))transexpire, transfer);
427             else
428                 transfer->close = 1;
429         }
430         break;
431     }
432 }
433
434 void transfersetactivity(struct transfer *transfer, wchar_t *desc)
435 {
436     time(&transfer->activity);
437     if(desc != NULL)
438     {
439         if(transfer->actdesc != NULL)
440             free(transfer->actdesc);
441         transfer->actdesc = swcsdup(desc);
442     }
443     bumptransfer(transfer);
444     CBCHAINDOCB(transfer, trans_act, transfer);
445 }
446
447 void transfersetstate(struct transfer *transfer, int newstate)
448 {
449     transfer->state = newstate;
450     if(transfer->etimer != NULL)
451         canceltimer(transfer->etimer);
452     transfersetactivity(transfer, NULL);
453     CBCHAINDOCB(transfer, trans_ac, transfer, L"state");
454 }
455
456 void transfersetnick(struct transfer *transfer, wchar_t *newnick)
457 {
458     if(transfer->peernick != NULL)
459         free(transfer->peernick);
460     transfer->peernick = swcsdup(newnick);
461     CBCHAINDOCB(transfer, trans_ac, transfer, L"nick");
462 }
463
464 void transfersetsize(struct transfer *transfer, int newsize)
465 {
466     transfer->size = newsize;
467     CBCHAINDOCB(transfer, trans_ac, transfer, L"size");
468 }
469
470 void transferseterror(struct transfer *transfer, int error)
471 {
472     transfer->error = error;
473     CBCHAINDOCB(transfer, trans_ac, transfer, L"error");
474 }
475
476 void transfersetpath(struct transfer *transfer, wchar_t *path)
477 {
478     if(transfer->path != NULL)
479         free(transfer->path);
480     transfer->path = swcsdup(path);
481     CBCHAINDOCB(transfer, trans_ac, transfer, L"path");
482 }
483
484 void transfersethash(struct transfer *transfer, struct hash *hash)
485 {
486     if(transfer->hash != NULL)
487         freehash(transfer->hash);
488     transfer->hash = hash;
489     CBCHAINDOCB(transfer, trans_ac, transfer, L"hash");
490 }
491
492 int slotsleft(void)
493 {
494     struct transfer *transfer;
495     int slots;
496     
497     slots = confgetint("transfer", "slots");
498     for(transfer = transfers; (transfer != NULL) && (slots > 0); transfer = transfer->next)
499     {
500         if((transfer->dir == TRNSD_UP) && (transfer->state == TRNS_MAIN) && !transfer->flags.b.minislot)
501             slots--;
502     }
503     return(slots);
504 }
505
506 static void killfilter(struct transfer *transfer)
507 {
508     if(transfer->filter != -1)
509     {
510         kill(-transfer->filter, SIGHUP);
511         transfer->filter = -1;
512     }
513     if(transfer->localend)
514     {
515         transfer->localend->readcb = NULL;
516         transfer->localend->writecb = NULL;
517         transfer->localend->errcb = NULL;
518         putsock(transfer->localend);
519         transfer->localend = NULL;
520     }
521     if(transfer->filterout)
522     {
523         transfer->filterout->readcb = NULL;
524         putsock(transfer->filterout);
525         transfer->filterout = NULL;
526     }
527     if(transfer->filterbuf)
528     {
529         free(transfer->filterbuf);
530         transfer->filterbuf = NULL;
531     }
532     transfer->filterbufsize = transfer->filterbufdata = 0;
533 }
534
535 static void handletranscmd(struct transfer *transfer, wchar_t *cmd, wchar_t *arg)
536 {
537     if(!wcscmp(cmd, L"status")) {
538         if(arg == NULL)
539             arg = L"";
540         if(transfer->exitstatus != NULL)
541             free(transfer->exitstatus);
542         transfer->exitstatus = swcsdup(arg);
543     }
544 }
545
546 static void filterread(struct socket *sk, struct transfer *transfer)
547 {
548     char *buf, *p, *p2;
549     size_t bufsize;
550     wchar_t *cmd, *arg;
551     
552     if((buf = sockgetinbuf(sk, &bufsize)) == NULL)
553         return;
554     bufcat(transfer->filterbuf, buf, bufsize);
555     free(buf);
556     while((p = memchr(transfer->filterbuf, '\n', transfer->filterbufdata)) != NULL)
557     {
558         *(p++) = 0;
559         if((p2 = strchr(transfer->filterbuf, ' ')) != NULL)
560             *(p2++) = 0;
561         if((cmd = icmbstowcs(transfer->filterbuf, NULL)) != NULL)
562         {
563             arg = NULL;
564             if(p2 != NULL)
565             {
566                 if((arg = icmbstowcs(p2, NULL)) == NULL)
567                     flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", p2, strerror(errno));
568             }
569             handletranscmd(transfer, cmd, arg);
570             CBCHAINDOCB(transfer, trans_filterout, transfer, cmd, arg);
571             if(arg != NULL)
572                 free(arg);
573             free(cmd);
574         } else {
575             flog(LOG_WARNING, "filter sent a string which could not be converted into the local charset: %s: %s", transfer->filterbuf, strerror(errno));
576         }
577         memmove(transfer->filterbuf, p, transfer->filterbufdata -= (p - transfer->filterbuf));
578     }
579 }
580
581 static void filterexit(pid_t pid, int status, void *data)
582 {
583     struct transfer *transfer;
584     struct fnet *fnet;
585     wchar_t *peerid;
586     
587     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
588     {
589         if(transfer->filter == pid)
590         {
591             transfer->filter = -1;
592             killfilter(transfer);
593             fnet = transfer->fnet;
594             peerid = swcsdup(transfer->peerid);
595             if(WEXITSTATUS(status))
596                 resettransfer(transfer);
597             else
598                 freetransfer(transfer);
599             trytransferbypeer(fnet, peerid);
600             free(peerid);
601             break;
602         }
603     }
604 }
605
606 int forkfilter(struct transfer *transfer)
607 {
608     char *filtername, *filename, *peerid, *buf;
609     wchar_t *wfilename;
610     struct passwd *pwent;
611     pid_t pid;
612     int inpipe, outpipe;
613     char **argv;
614     size_t argvsize, argvdata;
615     struct socket *insock, *outsock;
616     struct wcspair *ta;
617     char *rec, *val;
618
619     wfilename = transfer->path;
620     if(transfer->fnet->filebasename != NULL)
621         wfilename = transfer->fnet->filebasename(wfilename);
622     if(transfer->auth == NULL)
623     {
624         flog(LOG_WARNING, "tried to fork filter for transfer with NULL authhandle (tranfer %i)", transfer->id);
625         errno = EACCES;
626         return(-1);
627     }
628     if((pwent = getpwuid(transfer->owner)) == NULL)
629     {
630         flog(LOG_WARNING, "no passwd entry for uid %i (found in transfer %i)", transfer->owner, transfer->id);
631         errno = EACCES;
632         return(-1);
633     }
634     filtername = findfile("dc-filter", pwent->pw_dir, 0);
635     if(filtername == NULL)
636         filtername = findfile(icswcstombs(confgetstr("transfer", "filter"), NULL, NULL), NULL, 0);
637     if(filtername == NULL)
638     {
639         flog(LOG_WARNING, "could not find filter for user %s", pwent->pw_name);
640         errno = ENOENT;
641         return(-1);
642     }
643     if((filename = icwcstombs(wfilename, NULL)) == NULL)
644     {
645         if((buf = icwcstombs(wfilename, "UTF-8")) == NULL)
646         {
647             flog(LOG_WARNING, "could convert transfer filename to neither local charset nor UTF-8: %s", strerror(errno));
648             return(-1);
649         }
650         filename = sprintf2("utf8-%s", buf);
651         free(buf);
652     }
653     if((peerid = icwcstombs(transfer->peerid, NULL)) == NULL)
654     {
655         if((buf = icwcstombs(transfer->peerid, "UTF-8")) == NULL)
656         {
657             flog(LOG_WARNING, "could convert transfer peerid to neither local charset nor UTF-8: %s", strerror(errno));
658             free(filename);
659             return(-1);
660         }
661         peerid = sprintf2("utf8-%s", buf);
662         free(buf);
663     }
664     if((pid = forksess(transfer->owner, transfer->auth, filterexit, NULL, FD_PIPE, 0, O_WRONLY, &inpipe, FD_PIPE, 1, O_RDONLY, &outpipe, FD_FILE, 2, O_RDWR, "/dev/null", FD_END)) < 0)
665     {
666         flog(LOG_WARNING, "could not fork session for filter for transfer %i: %s", transfer->id, strerror(errno));
667         return(-1);
668     }
669     if(pid == 0)
670     {
671         argv = NULL;
672         argvsize = argvdata = 0;
673         buf = sprintf2("%zi", transfer->size);
674         addtobuf(argv, filtername);
675         addtobuf(argv, filename);
676         addtobuf(argv, buf);
677         addtobuf(argv, peerid);
678         if(transfer->hash)
679         {
680             if((buf = icwcstombs(unparsehash(transfer->hash), NULL)) != NULL)
681             {
682                 /* XXX: I am very doubtful of this, but it can just as
683                  * well be argued that all data should be presented as
684                  * key-value pairs. */
685                 addtobuf(argv, "hash");
686                 addtobuf(argv, buf);
687             } else {
688                 flog(LOG_WARNING, "could not convert hash to local charset");
689             }
690         }
691         for(ta = transfer->args; ta != NULL; ta = ta->next)
692         {
693             if((rec = icwcstombs(ta->key, NULL)) == NULL)
694                 continue;
695             if((val = icwcstombs(ta->val, NULL)) == NULL)
696                 continue;
697             addtobuf(argv, rec);
698             addtobuf(argv, val);
699         }
700         addtobuf(argv, NULL);
701         execv(filtername, argv);
702         flog(LOG_WARNING, "could not exec filter %s: %s", filtername, strerror(errno));
703         exit(127);
704     }
705     insock = wrapsock(inpipe);
706     outsock = wrapsock(outpipe);
707     /* Really, really strange thing here - sometimes the kernel would
708      * return POLLIN on insock, even though it's a write-side
709      * pipe. The corresponding read on the pipe naturally returns
710      * EBADF, causing doldacond to think there's something wrong with
711      * the fd, and thus it closes it. Until I can find out whyever the
712      * kernel gives a POLLIN on the fd (if I can at all...), I'll just
713      * set ignread on insock for now. */
714     insock->ignread = 1;
715     transfer->filter = pid;
716     transfersetlocalend(transfer, insock);
717     getsock(transfer->filterout = outsock);
718     outsock->data = transfer;
719     outsock->readcb = (void (*)(struct socket *, void *))filterread;
720     putsock(insock);
721     putsock(outsock);
722     free(filtername);
723     free(filename);
724     free(peerid);
725     return(0);
726 }
727
728 static int run(void)
729 {
730     struct transfer *transfer, *next;
731     
732     for(transfer = transfers; transfer != NULL; transfer = transfer->next)
733     {
734         if((transfer->endpos >= 0) && (transfer->state == TRNS_MAIN) && (transfer->localend != NULL) && (transfer->localend->state == SOCK_EST) && (transfer->curpos >= transfer->endpos))
735         {
736             if((transfer->iface != NULL) && (transfer->iface->endofdata != NULL))
737                 transfer->iface->endofdata(transfer, transfer->ifacedata);
738             closesock(transfer->localend);
739         }
740     }
741     for(transfer = transfers; transfer != NULL; transfer = next)
742     {
743         next = transfer->next;
744         if(transfer->close)
745         {
746             transferdetach(transfer);
747             freetransfer(transfer);
748             continue;
749         }
750     }
751     return(0);
752 }
753
754 static struct configvar myvars[] =
755 {
756     /** The maximum number of simultaneously permitted uploads. A
757      * common hub rule is that you will need at least as many slots as
758      * the number of hubs to which you are connected. */
759     {CONF_VAR_INT, "slots", {.num = 3}},
760     /** The TOS value to use for upload connections (see the TOS
761      * VALUES section). */
762     {CONF_VAR_INT, "ultos", {.num = SOCK_TOS_MAXTP}},
763     /** The TOS value to use for download connections (see the TOS
764      * VALUES section). */
765     {CONF_VAR_INT, "dltos", {.num = SOCK_TOS_MAXTP}},
766     /** The name of the filter script (see the FILES section for
767      * lookup information). */
768     {CONF_VAR_STRING, "filter", {.str = L"dc-filter"}},
769     /** If true, only one upload is allowed per remote peer. This
770      * option is still experimental, so it is recommended to leave it
771      * off. */
772     {CONF_VAR_BOOL, "ulquota", {.num = 0}},
773     {CONF_VAR_END}
774 };
775
776 static struct module me =
777 {
778     .conf =
779     {
780         .vars = myvars
781     },
782     .name = "transfer",
783     .run = run
784 };
785
786 MODULE(me);