8 void (*_forker)(void(*)(void*), void*, int);
10 static char Ebadattach[] = "unknown specifier in attach";
11 static char Ebadoffset[] = "bad offset";
12 static char Ebadcount[] = "bad count";
13 static char Ebotch[] = "9P protocol botch";
14 static char Ecreatenondir[] = "create in non-directory";
15 static char Edupfid[] = "duplicate fid";
16 static char Eduptag[] = "duplicate tag";
17 static char Eisdir[] = "is a directory";
18 static char Enocreate[] = "create prohibited";
19 static char Enomem[] = "out of memory";
20 static char Enoremove[] = "remove prohibited";
21 static char Enostat[] = "stat prohibited";
22 static char Enotfound[] = "file not found";
23 static char Enowrite[] = "write prohibited";
24 static char Enowstat[] = "wstat prohibited";
25 static char Eperm[] = "permission denied";
26 static char Eunknownfid[] = "unknown fid";
27 static char Ebaddir[] = "bad directory in wstat";
28 static char Ewalknodir[] = "walk in non-directory";
31 setfcallerror(Fcall *f, char *err)
38 changemsize(Srv *srv, int msize)
40 if(srv->rbuf && srv->wbuf && srv->msize == msize)
47 srv->rbuf = emalloc9p(msize);
48 srv->wbuf = emalloc9p(msize);
62 n = read9pmsg(s->infd, s->rbuf, s->msize);
69 memmove(buf, s->rbuf, n);
72 if(convM2S(buf, n, &f) != n){
77 if((r=allocreq(s->rpool, f.tag)) == nil){ /* duplicate tag: cons up a fake Req */
78 r = emalloc9p(sizeof *r);
89 fprint(2, "<-%d- %F: dup tag\n", s->infd, &f);
97 memset(&r->ofcall, 0, sizeof r->ofcall);
98 r->type = r->ifcall.type;
102 fprint(2, "<-%d- %F: %s\n", s->infd, &r->ifcall, r->error);
104 fprint(2, "<-%d- %F\n", s->infd, &r->ifcall);
119 for(i=0; i<r->ifcall.nwname; i++)
120 if(f = walkfile(f, r->ifcall.wname[i]))
121 r->ofcall.wqid[i] = f->qid;
128 r->newfid->qid = r->newfid->file->qid;
134 walkandclone(Req *r, char *(*walk1)(Fid*, char*, void*), char *(*clone)(Fid*, Fid*, void*), void *arg)
139 if(r->fid == r->newfid && r->ifcall.nwname > 1){
140 respond(r, "lib9p: unused documented feature not implemented");
144 if(r->fid != r->newfid){
145 r->newfid->qid = r->fid->qid;
146 if(clone && (e = clone(r->fid, r->newfid, arg))){
153 for(i=0; i<r->ifcall.nwname; i++){
154 if(e = walk1(r->newfid, r->ifcall.wname[i], arg))
156 r->ofcall.wqid[i] = r->newfid->qid;
167 sversion(Srv *srv, Req *r)
169 if(srv->rref.ref != 1){
173 if(strncmp(r->ifcall.version, "9P", 2) != 0){
174 r->ofcall.version = "unknown";
178 r->ofcall.version = "9P2000";
179 if(r->ifcall.msize < 256){
180 respond(r, "version: message size too small");
183 if(r->ifcall.msize < 1024*1024)
184 r->ofcall.msize = r->ifcall.msize;
186 r->ofcall.msize = 1024*1024;
191 rversion(Req *r, char *error)
194 changemsize(r->srv, r->ofcall.msize);
198 sauth(Srv *srv, Req *r)
202 if((r->afid = allocfid(srv->fpool, r->ifcall.afid)) == nil){
209 snprint(e, sizeof e, "%s: authentication not required", argv0);
214 rauth(Req *r, char *error)
217 closefid(removefid(r->srv->fpool, r->afid->fid));
221 sattach(Srv *srv, Req *r)
223 if((r->fid = allocfid(srv->fpool, r->ifcall.fid)) == nil){
228 if(r->ifcall.afid != NOFID && (r->afid = lookupfid(srv->fpool, r->ifcall.afid)) == nil){
229 respond(r, Eunknownfid);
232 r->fid->uid = estrdup9p(r->ifcall.uname);
234 r->fid->file = srv->tree->root;
235 incref(r->fid->file);
236 r->ofcall.qid = r->fid->file->qid;
237 r->fid->qid = r->ofcall.qid;
246 rattach(Req *r, char *error)
249 closefid(removefid(r->srv->fpool, r->fid->fid));
253 sflush(Srv *srv, Req *r)
255 r->oldreq = lookupreq(srv->rpool, r->ifcall.oldtag);
256 if(r->oldreq == nil || r->oldreq == r)
264 rflush(Req *r, char *error)
268 assert(error == nil);
272 if(or->responded == 0){
273 or->flush = erealloc9p(or->flush, (or->nflush+1)*sizeof(or->flush[0]));
274 or->flush[or->nflush++] = r;
276 return -1; /* delay response until or is responded */
286 oldwalk1(Fid *fid, char *name, void *arg)
293 e = srv->walk1(fid, name, &qid);
301 oldclone(Fid *fid, Fid *newfid, void *arg)
306 if(srv->clone == nil)
308 return srv->clone(fid, newfid);
312 swalk(Srv *srv, Req *r)
314 if((r->fid = lookupfid(srv->fpool, r->ifcall.fid)) == nil){
315 respond(r, Eunknownfid);
318 if(r->fid->omode != -1){
319 respond(r, "cannot clone open fid");
322 if(r->ifcall.nwname && !(r->fid->qid.type&QTDIR)){
323 respond(r, Ewalknodir);
326 if(r->ifcall.fid != r->ifcall.newfid){
327 if((r->newfid = allocfid(srv->fpool, r->ifcall.newfid)) == nil){
331 r->newfid->uid = estrdup9p(r->fid->uid);
333 incref(&r->fid->ref);
339 walkandclone(r, oldwalk1, oldclone, srv);
343 sysfatal("no walk function, no file trees");
346 rwalk(Req *r, char *error)
348 if(error || r->ofcall.nwqid < r->ifcall.nwname){
349 if(r->ifcall.fid != r->ifcall.newfid && r->newfid)
350 closefid(removefid(r->srv->fpool, r->newfid->fid));
351 if (r->ofcall.nwqid==0){
352 if(error==nil && r->ifcall.nwname!=0)
353 r->error = Enotfound;
355 r->error = nil; // No error on partial walks
357 if(r->ofcall.nwqid == 0){
359 r->newfid->qid = r->fid->qid;
361 /* if file trees are in use, filewalk took care of the rest */
362 r->newfid->qid = r->ofcall.wqid[r->ofcall.nwqid-1];
368 dirwritable(Fid *fid)
375 if(f->parent && !hasperm(f->parent, fid->uid, AWRITE)){
385 sopen(Srv *srv, Req *r)
389 if((r->fid = lookupfid(srv->fpool, r->ifcall.fid)) == nil){
390 respond(r, Eunknownfid);
393 if(r->fid->omode != -1){
397 if((r->fid->qid.type&QTDIR) && (r->ifcall.mode&~ORCLOSE) != OREAD){
401 r->ofcall.qid = r->fid->qid;
402 switch(r->ifcall.mode&3){
418 if(r->ifcall.mode&OTRUNC)
420 if((r->fid->qid.type&QTDIR) && p!=AREAD){
425 if(!hasperm(r->fid->file, r->fid->uid, p)){
429 if((r->ifcall.mode&ORCLOSE) && !dirwritable(r->fid)){
433 r->ofcall.qid = r->fid->file->qid;
434 if((r->ofcall.qid.type&QTDIR)
435 && (r->fid->rdir = opendirfile(r->fid->file)) == nil){
436 respond(r, "opendirfile failed");
446 ropen(Req *r, char *error)
452 snprint(errbuf, sizeof errbuf, "fid mode is 0x%ux\n", r->ifcall.mode);
453 write(2, errbuf, strlen(errbuf));
455 r->fid->omode = r->ifcall.mode;
456 r->fid->qid = r->ofcall.qid;
457 if(r->ofcall.qid.type&QTDIR)
458 r->fid->diroffset = 0;
462 screate(Srv *srv, Req *r)
464 if((r->fid = lookupfid(srv->fpool, r->ifcall.fid)) == nil)
465 respond(r, Eunknownfid);
466 else if(r->fid->omode != -1)
468 else if(!(r->fid->qid.type&QTDIR))
469 respond(r, Ecreatenondir);
470 else if(r->fid->file && !hasperm(r->fid->file, r->fid->uid, AWRITE))
475 respond(r, Enocreate);
478 rcreate(Req *r, char *error)
482 r->fid->omode = r->ifcall.mode;
483 r->fid->qid = r->ofcall.qid;
487 sread(Srv *srv, Req *r)
491 if((r->fid = lookupfid(srv->fpool, r->ifcall.fid)) == nil){
492 respond(r, Eunknownfid);
495 if((int)r->ifcall.count < 0){
499 if(r->ifcall.offset < 0
500 || ((r->fid->qid.type&QTDIR) && r->ifcall.offset != 0 && r->ifcall.offset != r->fid->diroffset)){
501 respond(r, Ebadoffset);
505 if(r->ifcall.count > srv->msize - IOHDRSZ)
506 r->ifcall.count = srv->msize - IOHDRSZ;
507 r->rbuf = emalloc9p(r->ifcall.count);
508 r->ofcall.data = r->rbuf;
509 o = r->fid->omode & 3;
510 if(o != OREAD && o != ORDWR && o != OEXEC){
514 if((r->fid->qid.type&QTDIR) && r->fid->file){
515 r->ofcall.count = readdirfile(r->fid->rdir, r->rbuf, r->ifcall.count);
522 respond(r, "no srv->read");
525 rread(Req *r, char *error)
527 if(error==nil && (r->fid->qid.type&QTDIR))
528 r->fid->diroffset += r->ofcall.count;
532 swrite(Srv *srv, Req *r)
537 if((r->fid = lookupfid(srv->fpool, r->ifcall.fid)) == nil){
538 respond(r, Eunknownfid);
541 if((int)r->ifcall.count < 0){
545 if(r->ifcall.offset < 0){
549 if(r->ifcall.count > srv->msize - IOHDRSZ)
550 r->ifcall.count = srv->msize - IOHDRSZ;
551 o = r->fid->omode & 3;
552 if(o != OWRITE && o != ORDWR){
553 snprint(e, sizeof e, "write on fid with open mode 0x%ux", r->fid->omode);
560 respond(r, Enowrite);
563 rwrite(Req *r, char *error)
568 r->fid->file->qid.vers++;
572 sclunk(Srv *srv, Req *r)
574 if((r->fid = removefid(srv->fpool, r->ifcall.fid)) == nil)
575 respond(r, Eunknownfid);
585 sremove(Srv *srv, Req *r)
587 if((r->fid = removefid(srv->fpool, r->ifcall.fid)) == nil){
588 respond(r, Eunknownfid);
591 if(!dirwritable(r->fid)){
598 respond(r, r->fid->file ? nil : Enoremove);
601 rremove(Req *r, char *error, char *errbuf)
606 if(removefile(r->fid->file) < 0){
607 snprint(errbuf, ERRMAX, "remove %s: %r",
616 sstat(Srv *srv, Req *r)
618 if((r->fid = lookupfid(srv->fpool, r->ifcall.fid)) == nil){
619 respond(r, Eunknownfid);
623 /* should we rlock the file? */
624 r->d = r->fid->file->Dir;
626 r->d.name = estrdup9p(r->d.name);
628 r->d.uid = estrdup9p(r->d.uid);
630 r->d.gid = estrdup9p(r->d.gid);
632 r->d.muid = estrdup9p(r->d.muid);
636 else if(r->fid->file)
642 rstat(Req *r, char *error)
650 if(convD2M(&r->d, tmp, BIT16SZ) != BIT16SZ){
651 r->error = "convD2M(_,_,BIT16SZ) did not return BIT16SZ";
654 n = GBIT16(tmp)+BIT16SZ;
655 statbuf = emalloc9p(n);
657 r->error = "out of memory";
660 r->ofcall.nstat = convD2M(&r->d, statbuf, n);
661 r->ofcall.stat = statbuf; /* freed in closereq */
662 if(r->ofcall.nstat <= BIT16SZ){
663 r->error = "convD2M fails";
670 swstat(Srv *srv, Req *r)
672 if((r->fid = lookupfid(srv->fpool, r->ifcall.fid)) == nil){
673 respond(r, Eunknownfid);
676 if(srv->wstat == nil){
677 respond(r, Enowstat);
680 if(convM2D(r->ifcall.stat, r->ifcall.nstat, &r->d, (char*)r->ifcall.stat) != r->ifcall.nstat){
684 if(r->d.qid.path != ~0 && r->d.qid.path != r->fid->qid.path){
685 respond(r, "wstat -- attempt to change qid.path");
688 if(r->d.qid.vers != ~0 && r->d.qid.vers != r->fid->qid.vers){
689 respond(r, "wstat -- attempt to change qid.vers");
693 if(r->d.mode & ~(DMDIR|DMAPPEND|DMEXCL|DMTMP|0777)){
694 respond(r, "wstat -- unknown bits in mode");
697 if(r->d.qid.type != (uchar)~0 && r->d.qid.type != ((r->d.mode>>24)&0xFF)){
698 respond(r, "wstat -- qid.type/mode mismatch");
701 if(((r->d.mode>>24) ^ r->fid->qid.type) & ~(QTAPPEND|QTEXCL|QTTMP)){
702 respond(r, "wstat -- attempt to change qid.type");
706 if(r->d.qid.type != (uchar)~0 && r->d.qid.type != r->fid->qid.type){
707 respond(r, "wstat -- attempt to change qid.type");
718 static void srvclose(Srv *);
726 while(r = getreq(srv)){
729 respond(r, r->error);
733 switch(r->ifcall.type){
735 respond(r, "unknown message");
737 case Tversion: sversion(srv, r); break;
738 case Tauth: sauth(srv, r); break;
739 case Tattach: sattach(srv, r); break;
740 case Tflush: sflush(srv, r); break;
741 case Twalk: swalk(srv, r); break;
742 case Topen: sopen(srv, r); break;
743 case Tcreate: screate(srv, r); break;
744 case Tread: sread(srv, r); break;
745 case Twrite: swrite(srv, r); break;
746 case Tclunk: sclunk(srv, r); break;
747 case Tremove: sremove(srv, r); break;
748 case Tstat: sstat(srv, r); break;
749 case Twstat: swstat(srv, r); break;
751 if(srv->sref.ref > 8 && srv->spid != getpid()){
753 qunlock(&srv->slock);
756 qunlock(&srv->slock);
759 if(srv->end && srv->sref.ref == 1)
761 if(decref(&srv->sref) == 0)
768 if(srv->rref.ref || srv->sref.ref)
772 fprint(2, "srvclose\n");
779 freefidpool(srv->fpool);
781 freereqpool(srv->rpool);
798 if(decref(&srv->sref) == 0){
800 _forker(srvwork, srv, 0);
802 qunlock(&srv->slock);
808 fmtinstall('D', dirfmt);
809 fmtinstall('F', fcallfmt);
811 srv->spid = getpid();
815 if(srv->fpool == nil)
816 srv->fpool = allocfidpool(srv->destroyfid);
817 if(srv->rpool == nil)
818 srv->rpool = allocreqpool(srv->destroyreq);
820 srv->msize = 8192+IOHDRSZ;
822 changemsize(srv, srv->msize);
824 srv->fpool->srv = srv;
825 srv->rpool->srv = srv;
835 respond(Req *r, char *error)
844 assert(r->responded == 0);
847 switch(r->ifcall.type){
849 * Flush is special. If the handler says so, we return
850 * without further processing. Respond will be called
851 * again once it is safe.
854 if(rflush(r, error)<0)
857 case Tversion: rversion(r, error); break;
858 case Tauth: rauth(r, error); break;
859 case Tattach: rattach(r, error); break;
860 case Twalk: rwalk(r, error); break;
861 case Topen: ropen(r, error); break;
862 case Tcreate: rcreate(r, error); break;
863 case Tread: rread(r, error); break;
864 case Twrite: rwrite(r, error); break;
865 case Tclunk: rclunk(r, error); break;
866 case Tremove: rremove(r, error, errbuf); break;
867 case Tstat: rstat(r, error); break;
868 case Twstat: rwstat(r, error); break;
871 r->ofcall.tag = r->ifcall.tag;
872 r->ofcall.type = r->ifcall.type+1;
874 setfcallerror(&r->ofcall, r->error);
877 fprint(2, "-%d-> %F\n", srv->outfd, &r->ofcall);
880 n = convS2M(&r->ofcall, srv->wbuf, srv->msize);
882 fprint(2, "msize = %d n = %d %F\n", srv->msize, n, &r->ofcall);
886 if(r->pool) /* not a fake */
887 closereq(removereq(r->pool, r->ifcall.tag));
888 m = write(srv->outfd, srv->wbuf, n);
890 fprint(2, "lib9p srv: write %d returned %d on fd %d: %r", n, m, srv->outfd);
891 qunlock(&srv->wlock);
893 qlock(&r->lk); /* no one will add flushes now */
897 for(i=0; i<r->nflush; i++)
898 respond(r->flush[i], nil);
908 if(decref(&srv->rref) == 0)
917 rerrstr(errbuf, sizeof errbuf);
922 postfd(char *name, int pfd)
927 snprint(buf, sizeof buf, "/srv/%s", name);
929 fprint(2, "postfd %s\n", buf);
930 fd = create(buf, OWRITE|ORCLOSE|OCEXEC, 0600);
933 fprint(2, "create fails: %r\n");
936 if(fprint(fd, "%d", pfd) < 0){
938 fprint(2, "write fails: %r\n");
943 fprint(2, "postfd successful\n");
948 sharefd(char *name, char *desc, int pfd)
953 snprint(buf, sizeof buf, "#σc/%s", name);
954 if((fd = create(buf, OREAD, 0700|DMDIR)) >= 0)
956 snprint(buf, sizeof buf, "#σc/%s/%s", name, desc);
958 fprint(2, "sharefd %s\n", buf);
959 fd = create(buf, OWRITE, 0600);
962 fprint(2, "create fails: %r\n");
965 if(fprint(fd, "%d\n", pfd) < 0){
967 fprint(2, "write fails: %r\n");
973 fprint(2, "sharefd successful\n");