1 2277c5d7 2004-03-21 devnull #include <u.h>
2 2277c5d7 2004-03-21 devnull #include <libc.h>
3 2277c5d7 2004-03-21 devnull #include <fcall.h>
4 2277c5d7 2004-03-21 devnull #include <thread.h>
5 2277c5d7 2004-03-21 devnull #include <9p.h>
7 8ba38113 2005-03-04 devnull int chatty9p;
9 cbeb0b26 2006-04-01 devnull /* static char Ebadattach[] = "unknown specifier in attach"; */
10 2277c5d7 2004-03-21 devnull static char Ebadoffset[] = "bad offset";
11 cbeb0b26 2006-04-01 devnull /* static char Ebadcount[] = "bad count"; */
12 2277c5d7 2004-03-21 devnull static char Ebotch[] = "9P protocol botch";
13 2277c5d7 2004-03-21 devnull static char Ecreatenondir[] = "create in non-directory";
14 2277c5d7 2004-03-21 devnull static char Edupfid[] = "duplicate fid";
15 2277c5d7 2004-03-21 devnull static char Eduptag[] = "duplicate tag";
16 2277c5d7 2004-03-21 devnull static char Eisdir[] = "is a directory";
17 2277c5d7 2004-03-21 devnull static char Enocreate[] = "create prohibited";
18 cbeb0b26 2006-04-01 devnull /* static char Enomem[] = "out of memory"; */
19 2277c5d7 2004-03-21 devnull static char Enoremove[] = "remove prohibited";
20 2277c5d7 2004-03-21 devnull static char Enostat[] = "stat prohibited";
21 2277c5d7 2004-03-21 devnull static char Enotfound[] = "file not found";
22 cbeb0b26 2006-04-01 devnull /* static char Enowrite[] = "write prohibited"; */
23 2277c5d7 2004-03-21 devnull static char Enowstat[] = "wstat prohibited";
24 2277c5d7 2004-03-21 devnull static char Eperm[] = "permission denied";
25 2277c5d7 2004-03-21 devnull static char Eunknownfid[] = "unknown fid";
26 2277c5d7 2004-03-21 devnull static char Ebaddir[] = "bad directory in wstat";
27 2277c5d7 2004-03-21 devnull static char Ewalknodir[] = "walk in non-directory";
29 2277c5d7 2004-03-21 devnull static void
30 2277c5d7 2004-03-21 devnull setfcallerror(Fcall *f, char *err)
32 2277c5d7 2004-03-21 devnull f->ename = err;
33 2277c5d7 2004-03-21 devnull f->type = Rerror;
36 2277c5d7 2004-03-21 devnull static void
37 2277c5d7 2004-03-21 devnull changemsize(Srv *srv, int msize)
39 2277c5d7 2004-03-21 devnull if(srv->rbuf && srv->wbuf && srv->msize == msize)
41 2277c5d7 2004-03-21 devnull qlock(&srv->rlock);
42 2277c5d7 2004-03-21 devnull qlock(&srv->wlock);
43 2277c5d7 2004-03-21 devnull srv->msize = msize;
44 2277c5d7 2004-03-21 devnull free(srv->rbuf);
45 2277c5d7 2004-03-21 devnull free(srv->wbuf);
46 2277c5d7 2004-03-21 devnull srv->rbuf = emalloc9p(msize);
47 2277c5d7 2004-03-21 devnull srv->wbuf = emalloc9p(msize);
48 2277c5d7 2004-03-21 devnull qunlock(&srv->rlock);
49 2277c5d7 2004-03-21 devnull qunlock(&srv->wlock);
52 2277c5d7 2004-03-21 devnull static Req*
53 2277c5d7 2004-03-21 devnull getreq(Srv *s)
56 2277c5d7 2004-03-21 devnull uchar *buf;
60 2277c5d7 2004-03-21 devnull qlock(&s->rlock);
61 2277c5d7 2004-03-21 devnull if((n = read9pmsg(s->infd, s->rbuf, s->msize)) <= 0){
62 2277c5d7 2004-03-21 devnull qunlock(&s->rlock);
63 2277c5d7 2004-03-21 devnull return nil;
66 943cb39d 2006-02-14 devnull buf = emalloc9p(n+1); /* +1 for NUL in swrite */
67 2277c5d7 2004-03-21 devnull memmove(buf, s->rbuf, n);
68 2277c5d7 2004-03-21 devnull qunlock(&s->rlock);
70 74dd0321 2010-12-07 rsc if(convM2S(buf, n, &f) != n){
71 2277c5d7 2004-03-21 devnull free(buf);
72 2277c5d7 2004-03-21 devnull return nil;
75 2277c5d7 2004-03-21 devnull if((r=allocreq(s->rpool, f.tag)) == nil){ /* duplicate tag: cons up a fake Req */
76 2277c5d7 2004-03-21 devnull r = emalloc9p(sizeof *r);
77 2277c5d7 2004-03-21 devnull incref(&r->ref);
78 2277c5d7 2004-03-21 devnull r->tag = f.tag;
79 2277c5d7 2004-03-21 devnull r->ifcall = f;
80 2277c5d7 2004-03-21 devnull r->error = Eduptag;
81 2277c5d7 2004-03-21 devnull r->buf = buf;
82 2277c5d7 2004-03-21 devnull r->responded = 0;
83 2277c5d7 2004-03-21 devnull r->type = 0;
84 2277c5d7 2004-03-21 devnull r->srv = s;
85 2277c5d7 2004-03-21 devnull r->pool = nil;
86 2277c5d7 2004-03-21 devnull if(chatty9p)
87 2277c5d7 2004-03-21 devnull fprint(2, "<-%d- %F: dup tag\n", s->infd, &f);
88 2277c5d7 2004-03-21 devnull return r;
91 2277c5d7 2004-03-21 devnull r->srv = s;
92 2277c5d7 2004-03-21 devnull r->responded = 0;
93 2277c5d7 2004-03-21 devnull r->buf = buf;
94 2277c5d7 2004-03-21 devnull r->ifcall = f;
95 2277c5d7 2004-03-21 devnull memset(&r->ofcall, 0, sizeof r->ofcall);
96 2277c5d7 2004-03-21 devnull r->type = r->ifcall.type;
98 2277c5d7 2004-03-21 devnull if(chatty9p)
99 2277c5d7 2004-03-21 devnull if(r->error)
100 2277c5d7 2004-03-21 devnull fprint(2, "<-%d- %F: %s\n", s->infd, &r->ifcall, r->error);
102 2277c5d7 2004-03-21 devnull fprint(2, "<-%d- %F\n", s->infd, &r->ifcall);
104 2277c5d7 2004-03-21 devnull return r;
107 2277c5d7 2004-03-21 devnull static void
108 2277c5d7 2004-03-21 devnull filewalk(Req *r)
111 2277c5d7 2004-03-21 devnull File *f;
113 2277c5d7 2004-03-21 devnull f = r->fid->file;
114 2277c5d7 2004-03-21 devnull assert(f != nil);
116 2277c5d7 2004-03-21 devnull incref(&f->ref);
117 2277c5d7 2004-03-21 devnull for(i=0; i<r->ifcall.nwname; i++)
118 2277c5d7 2004-03-21 devnull if(f = walkfile(f, r->ifcall.wname[i]))
119 2277c5d7 2004-03-21 devnull r->ofcall.wqid[i] = f->dir.qid;
123 2277c5d7 2004-03-21 devnull r->ofcall.nwqid = i;
125 2277c5d7 2004-03-21 devnull r->newfid->file = f;
126 2277c5d7 2004-03-21 devnull r->newfid->qid = r->newfid->file->dir.qid;
128 2277c5d7 2004-03-21 devnull respond(r, nil);
132 2277c5d7 2004-03-21 devnull walkandclone(Req *r, char *(*walk1)(Fid*, char*, void*), char *(*clone)(Fid*, Fid*, void*), void *arg)
135 2277c5d7 2004-03-21 devnull char *e;
137 2277c5d7 2004-03-21 devnull if(r->fid == r->newfid && r->ifcall.nwname > 1){
138 2277c5d7 2004-03-21 devnull respond(r, "lib9p: unused documented feature not implemented");
142 2277c5d7 2004-03-21 devnull if(r->fid != r->newfid){
143 2277c5d7 2004-03-21 devnull r->newfid->qid = r->fid->qid;
144 2277c5d7 2004-03-21 devnull if(clone && (e = clone(r->fid, r->newfid, arg))){
145 2277c5d7 2004-03-21 devnull respond(r, e);
150 2277c5d7 2004-03-21 devnull e = nil;
151 2277c5d7 2004-03-21 devnull for(i=0; i<r->ifcall.nwname; i++){
152 2277c5d7 2004-03-21 devnull if(e = walk1(r->newfid, r->ifcall.wname[i], arg))
154 2277c5d7 2004-03-21 devnull r->ofcall.wqid[i] = r->newfid->qid;
157 2277c5d7 2004-03-21 devnull r->ofcall.nwqid = i;
158 2277c5d7 2004-03-21 devnull if(e && i==0)
159 2277c5d7 2004-03-21 devnull respond(r, e);
161 2277c5d7 2004-03-21 devnull respond(r, nil);
164 2277c5d7 2004-03-21 devnull static void
165 2277c5d7 2004-03-21 devnull sversion(Srv *srv, Req *r)
167 2277c5d7 2004-03-21 devnull USED(srv);
169 74dd0321 2010-12-07 rsc if(strncmp(r->ifcall.version, "9P2000", 6) != 0){
170 2277c5d7 2004-03-21 devnull r->ofcall.version = "unknown";
171 2277c5d7 2004-03-21 devnull respond(r, nil);
174 74dd0321 2010-12-07 rsc r->ofcall.version = "9P2000";
175 2277c5d7 2004-03-21 devnull r->ofcall.msize = r->ifcall.msize;
176 2277c5d7 2004-03-21 devnull respond(r, nil);
179 2277c5d7 2004-03-21 devnull static void
180 2277c5d7 2004-03-21 devnull rversion(Req *r, char *error)
182 2277c5d7 2004-03-21 devnull assert(error == nil);
183 2277c5d7 2004-03-21 devnull changemsize(r->srv, r->ofcall.msize);
186 2277c5d7 2004-03-21 devnull static void
187 2277c5d7 2004-03-21 devnull sauth(Srv *srv, Req *r)
189 2277c5d7 2004-03-21 devnull char e[ERRMAX];
191 2277c5d7 2004-03-21 devnull if((r->afid = allocfid(srv->fpool, r->ifcall.afid)) == nil){
192 2277c5d7 2004-03-21 devnull respond(r, Edupfid);
195 2277c5d7 2004-03-21 devnull if(srv->auth)
196 2277c5d7 2004-03-21 devnull srv->auth(r);
198 2277c5d7 2004-03-21 devnull snprint(e, sizeof e, "%s: authentication not required", argv0);
199 2277c5d7 2004-03-21 devnull respond(r, e);
203 2277c5d7 2004-03-21 devnull static void
204 2277c5d7 2004-03-21 devnull rauth(Req *r, char *error)
206 2277c5d7 2004-03-21 devnull if(error && r->afid)
207 2277c5d7 2004-03-21 devnull closefid(removefid(r->srv->fpool, r->afid->fid));
210 2277c5d7 2004-03-21 devnull static void
211 2277c5d7 2004-03-21 devnull sattach(Srv *srv, Req *r)
213 2277c5d7 2004-03-21 devnull if((r->fid = allocfid(srv->fpool, r->ifcall.fid)) == nil){
214 2277c5d7 2004-03-21 devnull respond(r, Edupfid);
217 2277c5d7 2004-03-21 devnull r->afid = nil;
218 2277c5d7 2004-03-21 devnull if(r->ifcall.afid != NOFID && (r->afid = lookupfid(srv->fpool, r->ifcall.afid)) == nil){
219 2277c5d7 2004-03-21 devnull respond(r, Eunknownfid);
222 2277c5d7 2004-03-21 devnull r->fid->uid = estrdup9p(r->ifcall.uname);
223 2277c5d7 2004-03-21 devnull if(srv->tree){
224 2277c5d7 2004-03-21 devnull r->fid->file = srv->tree->root;
225 845f6bce 2008-02-04 rsc incref(&r->fid->file->ref);
226 2277c5d7 2004-03-21 devnull r->ofcall.qid = r->fid->file->dir.qid;
227 2277c5d7 2004-03-21 devnull r->fid->qid = r->ofcall.qid;
229 2277c5d7 2004-03-21 devnull if(srv->attach)
230 2277c5d7 2004-03-21 devnull srv->attach(r);
232 2277c5d7 2004-03-21 devnull respond(r, nil);
236 2277c5d7 2004-03-21 devnull static void
237 2277c5d7 2004-03-21 devnull rattach(Req *r, char *error)
239 2277c5d7 2004-03-21 devnull if(error && r->fid)
240 2277c5d7 2004-03-21 devnull closefid(removefid(r->srv->fpool, r->fid->fid));
243 2277c5d7 2004-03-21 devnull static void
244 2277c5d7 2004-03-21 devnull sflush(Srv *srv, Req *r)
246 2277c5d7 2004-03-21 devnull r->oldreq = lookupreq(srv->rpool, r->ifcall.oldtag);
247 2277c5d7 2004-03-21 devnull if(r->oldreq == nil || r->oldreq == r)
248 2277c5d7 2004-03-21 devnull respond(r, nil);
249 2277c5d7 2004-03-21 devnull else if(srv->flush)
250 2277c5d7 2004-03-21 devnull srv->flush(r);
252 2277c5d7 2004-03-21 devnull respond(r, nil);
255 2277c5d7 2004-03-21 devnull static int
256 2277c5d7 2004-03-21 devnull rflush(Req *r, char *error)
258 2277c5d7 2004-03-21 devnull Req *or;
260 2277c5d7 2004-03-21 devnull assert(error == nil);
261 2277c5d7 2004-03-21 devnull or = r->oldreq;
263 2277c5d7 2004-03-21 devnull qlock(&or->lk);
264 2277c5d7 2004-03-21 devnull if(or->responded == 0){
265 2277c5d7 2004-03-21 devnull or->flush = erealloc9p(or->flush, (or->nflush+1)*sizeof(or->flush[0]));
266 2277c5d7 2004-03-21 devnull or->flush[or->nflush++] = r;
267 2277c5d7 2004-03-21 devnull qunlock(&or->lk);
268 2277c5d7 2004-03-21 devnull return -1; /* delay response until or is responded */
270 2277c5d7 2004-03-21 devnull qunlock(&or->lk);
271 2277c5d7 2004-03-21 devnull closereq(or);
273 2277c5d7 2004-03-21 devnull r->oldreq = nil;
274 2277c5d7 2004-03-21 devnull return 0;
277 2277c5d7 2004-03-21 devnull static char*
278 2277c5d7 2004-03-21 devnull oldwalk1(Fid *fid, char *name, void *arg)
280 2277c5d7 2004-03-21 devnull char *e;
281 2277c5d7 2004-03-21 devnull Qid qid;
282 2277c5d7 2004-03-21 devnull Srv *srv;
284 2277c5d7 2004-03-21 devnull srv = arg;
285 2277c5d7 2004-03-21 devnull e = srv->walk1(fid, name, &qid);
287 2277c5d7 2004-03-21 devnull return e;
288 2277c5d7 2004-03-21 devnull fid->qid = qid;
289 2277c5d7 2004-03-21 devnull return nil;
292 2277c5d7 2004-03-21 devnull static char*
293 2277c5d7 2004-03-21 devnull oldclone(Fid *fid, Fid *newfid, void *arg)
295 2277c5d7 2004-03-21 devnull Srv *srv;
297 2277c5d7 2004-03-21 devnull srv = arg;
298 2277c5d7 2004-03-21 devnull if(srv->clone == nil)
299 2277c5d7 2004-03-21 devnull return nil;
300 2277c5d7 2004-03-21 devnull return srv->clone(fid, newfid);
303 2277c5d7 2004-03-21 devnull static void
304 2277c5d7 2004-03-21 devnull swalk(Srv *srv, Req *r)
306 2277c5d7 2004-03-21 devnull if((r->fid = lookupfid(srv->fpool, r->ifcall.fid)) == nil){
307 2277c5d7 2004-03-21 devnull respond(r, Eunknownfid);
310 2277c5d7 2004-03-21 devnull if(r->fid->omode != -1){
311 2277c5d7 2004-03-21 devnull respond(r, "cannot clone open fid");
314 2277c5d7 2004-03-21 devnull if(r->ifcall.nwname && !(r->fid->qid.type&QTDIR)){
315 2277c5d7 2004-03-21 devnull respond(r, Ewalknodir);
318 2277c5d7 2004-03-21 devnull if(r->ifcall.fid != r->ifcall.newfid){
319 2277c5d7 2004-03-21 devnull if((r->newfid = allocfid(srv->fpool, r->ifcall.newfid)) == nil){
320 2277c5d7 2004-03-21 devnull respond(r, Edupfid);
323 2277c5d7 2004-03-21 devnull r->newfid->uid = estrdup9p(r->fid->uid);
325 2277c5d7 2004-03-21 devnull incref(&r->fid->ref);
326 2277c5d7 2004-03-21 devnull r->newfid = r->fid;
328 2277c5d7 2004-03-21 devnull if(r->fid->file){
329 2277c5d7 2004-03-21 devnull filewalk(r);
330 2277c5d7 2004-03-21 devnull }else if(srv->walk1)
331 2277c5d7 2004-03-21 devnull walkandclone(r, oldwalk1, oldclone, srv);
332 2277c5d7 2004-03-21 devnull else if(srv->walk)
333 2277c5d7 2004-03-21 devnull srv->walk(r);
335 2277c5d7 2004-03-21 devnull sysfatal("no walk function, no file trees");
337 2277c5d7 2004-03-21 devnull static void
338 2277c5d7 2004-03-21 devnull rwalk(Req *r, char *error)
340 2277c5d7 2004-03-21 devnull if(error || r->ofcall.nwqid < r->ifcall.nwname){
341 2277c5d7 2004-03-21 devnull if(r->ifcall.fid != r->ifcall.newfid && r->newfid)
342 2277c5d7 2004-03-21 devnull closefid(removefid(r->srv->fpool, r->newfid->fid));
343 2277c5d7 2004-03-21 devnull if (r->ofcall.nwqid==0){
344 2277c5d7 2004-03-21 devnull if(error==nil && r->ifcall.nwname!=0)
345 2277c5d7 2004-03-21 devnull r->error = Enotfound;
347 cbeb0b26 2006-04-01 devnull r->error = nil; /* No error on partial walks */
349 2277c5d7 2004-03-21 devnull if(r->ofcall.nwqid == 0){
350 2277c5d7 2004-03-21 devnull /* Just a clone */
351 2277c5d7 2004-03-21 devnull r->newfid->qid = r->fid->qid;
353 2277c5d7 2004-03-21 devnull /* if file trees are in use, filewalk took care of the rest */
354 2277c5d7 2004-03-21 devnull r->newfid->qid = r->ofcall.wqid[r->ofcall.nwqid-1];
359 2277c5d7 2004-03-21 devnull static void
360 2277c5d7 2004-03-21 devnull sopen(Srv *srv, Req *r)
364 2277c5d7 2004-03-21 devnull if((r->fid = lookupfid(srv->fpool, r->ifcall.fid)) == nil){
365 2277c5d7 2004-03-21 devnull respond(r, Eunknownfid);
368 2277c5d7 2004-03-21 devnull if(r->fid->omode != -1){
369 2277c5d7 2004-03-21 devnull respond(r, Ebotch);
372 2277c5d7 2004-03-21 devnull if((r->fid->qid.type&QTDIR) && (r->ifcall.mode&~ORCLOSE) != OREAD){
373 2277c5d7 2004-03-21 devnull respond(r, Eisdir);
376 2277c5d7 2004-03-21 devnull r->ofcall.qid = r->fid->qid;
377 2277c5d7 2004-03-21 devnull switch(r->ifcall.mode&3){
378 2277c5d7 2004-03-21 devnull default:
379 2277c5d7 2004-03-21 devnull assert(0);
380 2277c5d7 2004-03-21 devnull case OREAD:
381 2277c5d7 2004-03-21 devnull p = AREAD;
383 2277c5d7 2004-03-21 devnull case OWRITE:
384 2277c5d7 2004-03-21 devnull p = AWRITE;
386 2277c5d7 2004-03-21 devnull case ORDWR:
387 2277c5d7 2004-03-21 devnull p = AREAD|AWRITE;
389 2277c5d7 2004-03-21 devnull case OEXEC:
390 2277c5d7 2004-03-21 devnull p = AEXEC;
393 2277c5d7 2004-03-21 devnull if(r->ifcall.mode&OTRUNC)
394 2277c5d7 2004-03-21 devnull p |= AWRITE;
395 2277c5d7 2004-03-21 devnull if((r->fid->qid.type&QTDIR) && p!=AREAD){
396 2277c5d7 2004-03-21 devnull respond(r, Eperm);
399 2277c5d7 2004-03-21 devnull if(r->fid->file){
400 2277c5d7 2004-03-21 devnull if(!hasperm(r->fid->file, r->fid->uid, p)){
401 2277c5d7 2004-03-21 devnull respond(r, Eperm);
404 2277c5d7 2004-03-21 devnull /* BUG RACE */
405 2277c5d7 2004-03-21 devnull if((r->ifcall.mode&ORCLOSE)
406 2277c5d7 2004-03-21 devnull && !hasperm(r->fid->file->parent, r->fid->uid, AWRITE)){
407 2277c5d7 2004-03-21 devnull respond(r, Eperm);
410 2277c5d7 2004-03-21 devnull r->ofcall.qid = r->fid->file->dir.qid;
411 2277c5d7 2004-03-21 devnull if((r->ofcall.qid.type&QTDIR)
412 2277c5d7 2004-03-21 devnull && (r->fid->rdir = opendirfile(r->fid->file)) == nil){
413 2277c5d7 2004-03-21 devnull respond(r, "opendirfile failed");
417 2277c5d7 2004-03-21 devnull if(srv->open)
418 2277c5d7 2004-03-21 devnull srv->open(r);
420 2277c5d7 2004-03-21 devnull respond(r, nil);
423 2277c5d7 2004-03-21 devnull static void
424 2277c5d7 2004-03-21 devnull ropen(Req *r, char *error)
426 2277c5d7 2004-03-21 devnull char errbuf[ERRMAX];
427 2277c5d7 2004-03-21 devnull if(error)
429 2277c5d7 2004-03-21 devnull if(chatty9p){
430 2277c5d7 2004-03-21 devnull snprint(errbuf, sizeof errbuf, "fid mode is 0x%ux\n", r->ifcall.mode);
431 2277c5d7 2004-03-21 devnull write(2, errbuf, strlen(errbuf));
433 2277c5d7 2004-03-21 devnull r->fid->omode = r->ifcall.mode;
434 2277c5d7 2004-03-21 devnull r->fid->qid = r->ofcall.qid;
435 2277c5d7 2004-03-21 devnull if(r->ofcall.qid.type&QTDIR)
436 2277c5d7 2004-03-21 devnull r->fid->diroffset = 0;
439 2277c5d7 2004-03-21 devnull static void
440 2277c5d7 2004-03-21 devnull screate(Srv *srv, Req *r)
442 2277c5d7 2004-03-21 devnull if((r->fid = lookupfid(srv->fpool, r->ifcall.fid)) == nil)
443 2277c5d7 2004-03-21 devnull respond(r, Eunknownfid);
444 2277c5d7 2004-03-21 devnull else if(r->fid->omode != -1)
445 2277c5d7 2004-03-21 devnull respond(r, Ebotch);
446 2277c5d7 2004-03-21 devnull else if(!(r->fid->qid.type&QTDIR))
447 2277c5d7 2004-03-21 devnull respond(r, Ecreatenondir);
448 2277c5d7 2004-03-21 devnull else if(r->fid->file && !hasperm(r->fid->file, r->fid->uid, AWRITE))
449 2277c5d7 2004-03-21 devnull respond(r, Eperm);
450 2277c5d7 2004-03-21 devnull else if(srv->create)
451 2277c5d7 2004-03-21 devnull srv->create(r);
453 2277c5d7 2004-03-21 devnull respond(r, Enocreate);
456 2277c5d7 2004-03-21 devnull static void
457 2277c5d7 2004-03-21 devnull rcreate(Req *r, char *error)
459 2277c5d7 2004-03-21 devnull if(error)
461 2277c5d7 2004-03-21 devnull r->fid->omode = r->ifcall.mode;
462 2277c5d7 2004-03-21 devnull r->fid->qid = r->ofcall.qid;
465 2277c5d7 2004-03-21 devnull static void
466 2277c5d7 2004-03-21 devnull sread(Srv *srv, Req *r)
470 2277c5d7 2004-03-21 devnull if((r->fid = lookupfid(srv->fpool, r->ifcall.fid)) == nil){
471 2277c5d7 2004-03-21 devnull respond(r, Eunknownfid);
474 0cfb3760 2012-10-21 rsc if((int32)r->ifcall.count < 0){
475 2277c5d7 2004-03-21 devnull respond(r, Ebotch);
478 2277c5d7 2004-03-21 devnull if(r->ifcall.offset < 0
479 2277c5d7 2004-03-21 devnull || ((r->fid->qid.type&QTDIR) && r->ifcall.offset != 0 && r->ifcall.offset != r->fid->diroffset)){
480 2277c5d7 2004-03-21 devnull respond(r, Ebadoffset);
484 2277c5d7 2004-03-21 devnull if(r->ifcall.count > srv->msize - IOHDRSZ)
485 2277c5d7 2004-03-21 devnull r->ifcall.count = srv->msize - IOHDRSZ;
486 2277c5d7 2004-03-21 devnull r->rbuf = emalloc9p(r->ifcall.count);
487 2277c5d7 2004-03-21 devnull r->ofcall.data = r->rbuf;
488 2277c5d7 2004-03-21 devnull o = r->fid->omode & 3;
489 2277c5d7 2004-03-21 devnull if(o != OREAD && o != ORDWR && o != OEXEC){
490 2277c5d7 2004-03-21 devnull respond(r, Ebotch);
493 2277c5d7 2004-03-21 devnull if((r->fid->qid.type&QTDIR) && r->fid->file){
494 2277c5d7 2004-03-21 devnull r->ofcall.count = readdirfile(r->fid->rdir, r->rbuf, r->ifcall.count);
495 2277c5d7 2004-03-21 devnull respond(r, nil);
498 2277c5d7 2004-03-21 devnull if(srv->read)
499 2277c5d7 2004-03-21 devnull srv->read(r);
501 2277c5d7 2004-03-21 devnull respond(r, "no srv->read");
504 2277c5d7 2004-03-21 devnull static void
505 2277c5d7 2004-03-21 devnull rread(Req *r, char *error)
507 2277c5d7 2004-03-21 devnull if(error==nil && (r->fid->qid.type&QTDIR))
508 0529411c 2008-07-04 rsc r->fid->diroffset = r->ifcall.offset + r->ofcall.count;
511 2277c5d7 2004-03-21 devnull static void
512 2277c5d7 2004-03-21 devnull swrite(Srv *srv, Req *r)
515 2277c5d7 2004-03-21 devnull char e[ERRMAX];
517 2277c5d7 2004-03-21 devnull if((r->fid = lookupfid(srv->fpool, r->ifcall.fid)) == nil){
518 2277c5d7 2004-03-21 devnull respond(r, Eunknownfid);
521 0cfb3760 2012-10-21 rsc if((int32)r->ifcall.count < 0){
522 2277c5d7 2004-03-21 devnull respond(r, Ebotch);
525 2277c5d7 2004-03-21 devnull if(r->ifcall.offset < 0){
526 2277c5d7 2004-03-21 devnull respond(r, Ebotch);
529 2277c5d7 2004-03-21 devnull if(r->ifcall.count > srv->msize - IOHDRSZ)
530 2277c5d7 2004-03-21 devnull r->ifcall.count = srv->msize - IOHDRSZ;
531 2277c5d7 2004-03-21 devnull o = r->fid->omode & 3;
532 2277c5d7 2004-03-21 devnull if(o != OWRITE && o != ORDWR){
533 2277c5d7 2004-03-21 devnull snprint(e, sizeof e, "write on fid with open mode 0x%ux", r->fid->omode);
534 2277c5d7 2004-03-21 devnull respond(r, e);
537 943cb39d 2006-02-14 devnull if(srv->write){
538 943cb39d 2006-02-14 devnull r->ifcall.data[r->ifcall.count] = 0; /* enough room - see getreq */
539 2277c5d7 2004-03-21 devnull srv->write(r);
541 2277c5d7 2004-03-21 devnull respond(r, "no srv->write");
543 2277c5d7 2004-03-21 devnull static void
544 2277c5d7 2004-03-21 devnull rwrite(Req *r, char *error)
546 2277c5d7 2004-03-21 devnull if(error)
548 2277c5d7 2004-03-21 devnull if(r->fid->file)
549 2277c5d7 2004-03-21 devnull r->fid->file->dir.qid.vers++;
552 2277c5d7 2004-03-21 devnull static void
553 2277c5d7 2004-03-21 devnull sclunk(Srv *srv, Req *r)
555 2277c5d7 2004-03-21 devnull if((r->fid = removefid(srv->fpool, r->ifcall.fid)) == nil)
556 2277c5d7 2004-03-21 devnull respond(r, Eunknownfid);
558 2277c5d7 2004-03-21 devnull respond(r, nil);
560 2277c5d7 2004-03-21 devnull static void
561 2277c5d7 2004-03-21 devnull rclunk(Req *r, char *msg)
563 2277c5d7 2004-03-21 devnull USED(r);
564 2277c5d7 2004-03-21 devnull USED(msg);
567 2277c5d7 2004-03-21 devnull static void
568 2277c5d7 2004-03-21 devnull sremove(Srv *srv, Req *r)
570 2277c5d7 2004-03-21 devnull if((r->fid = removefid(srv->fpool, r->ifcall.fid)) == nil){
571 2277c5d7 2004-03-21 devnull respond(r, Eunknownfid);
574 2277c5d7 2004-03-21 devnull /* BUG RACE */
575 2277c5d7 2004-03-21 devnull if(r->fid->file && !hasperm(r->fid->file->parent, r->fid->uid, AWRITE)){
576 2277c5d7 2004-03-21 devnull respond(r, Eperm);
579 2277c5d7 2004-03-21 devnull if(srv->remove)
580 2277c5d7 2004-03-21 devnull srv->remove(r);
582 2277c5d7 2004-03-21 devnull respond(r, r->fid->file ? nil : Enoremove);
584 2277c5d7 2004-03-21 devnull static void
585 2277c5d7 2004-03-21 devnull rremove(Req *r, char *error, char *errbuf)
587 2277c5d7 2004-03-21 devnull if(error)
589 2277c5d7 2004-03-21 devnull if(r->fid->file){
590 2277c5d7 2004-03-21 devnull if(removefile(r->fid->file) < 0){
591 2277c5d7 2004-03-21 devnull snprint(errbuf, ERRMAX, "remove %s: %r",
592 2277c5d7 2004-03-21 devnull r->fid->file->dir.name);
593 2277c5d7 2004-03-21 devnull r->error = errbuf;
595 2277c5d7 2004-03-21 devnull r->fid->file = nil;
599 2277c5d7 2004-03-21 devnull static void
600 2277c5d7 2004-03-21 devnull sstat(Srv *srv, Req *r)
602 2277c5d7 2004-03-21 devnull if((r->fid = lookupfid(srv->fpool, r->ifcall.fid)) == nil){
603 2277c5d7 2004-03-21 devnull respond(r, Eunknownfid);
606 2277c5d7 2004-03-21 devnull if(r->fid->file){
607 2277c5d7 2004-03-21 devnull r->d = r->fid->file->dir;
608 2277c5d7 2004-03-21 devnull if(r->d.name)
609 2277c5d7 2004-03-21 devnull r->d.name = estrdup9p(r->d.name);
610 2277c5d7 2004-03-21 devnull if(r->d.uid)
611 2277c5d7 2004-03-21 devnull r->d.uid = estrdup9p(r->d.uid);
612 2277c5d7 2004-03-21 devnull if(r->d.gid)
613 2277c5d7 2004-03-21 devnull r->d.gid = estrdup9p(r->d.gid);
614 2277c5d7 2004-03-21 devnull if(r->d.muid)
615 2277c5d7 2004-03-21 devnull r->d.muid = estrdup9p(r->d.muid);
617 2277c5d7 2004-03-21 devnull if(srv->stat)
618 2277c5d7 2004-03-21 devnull srv->stat(r);
619 2277c5d7 2004-03-21 devnull else if(r->fid->file)
620 2277c5d7 2004-03-21 devnull respond(r, nil);
622 2277c5d7 2004-03-21 devnull respond(r, Enostat);
624 2277c5d7 2004-03-21 devnull static void
625 2277c5d7 2004-03-21 devnull rstat(Req *r, char *error)
628 2277c5d7 2004-03-21 devnull uchar *statbuf;
629 2277c5d7 2004-03-21 devnull uchar tmp[BIT16SZ];
631 2277c5d7 2004-03-21 devnull if(error)
633 74dd0321 2010-12-07 rsc if(convD2M(&r->d, tmp, BIT16SZ) != BIT16SZ){
634 74dd0321 2010-12-07 rsc r->error = "convD2M(_,_,BIT16SZ) did not return BIT16SZ";
637 2277c5d7 2004-03-21 devnull n = GBIT16(tmp)+BIT16SZ;
638 2277c5d7 2004-03-21 devnull statbuf = emalloc9p(n);
639 2277c5d7 2004-03-21 devnull if(statbuf == nil){
640 2277c5d7 2004-03-21 devnull r->error = "out of memory";
643 74dd0321 2010-12-07 rsc r->ofcall.nstat = convD2M(&r->d, statbuf, n);
644 2277c5d7 2004-03-21 devnull r->ofcall.stat = statbuf; /* freed in closereq */
645 2277c5d7 2004-03-21 devnull if(r->ofcall.nstat <= BIT16SZ){
646 74dd0321 2010-12-07 rsc r->error = "convD2M fails";
647 2277c5d7 2004-03-21 devnull free(statbuf);
652 2277c5d7 2004-03-21 devnull static void
653 2277c5d7 2004-03-21 devnull swstat(Srv *srv, Req *r)
655 2277c5d7 2004-03-21 devnull if((r->fid = lookupfid(srv->fpool, r->ifcall.fid)) == nil){
656 2277c5d7 2004-03-21 devnull respond(r, Eunknownfid);
659 2277c5d7 2004-03-21 devnull if(srv->wstat == nil){
660 2277c5d7 2004-03-21 devnull respond(r, Enowstat);
663 74dd0321 2010-12-07 rsc if(convM2D(r->ifcall.stat, r->ifcall.nstat, &r->d, (char*)r->ifcall.stat) != r->ifcall.nstat){
664 2277c5d7 2004-03-21 devnull respond(r, Ebaddir);
667 2277c5d7 2004-03-21 devnull if((ushort)~r->d.type){
668 2277c5d7 2004-03-21 devnull respond(r, "wstat -- attempt to change type");
671 2277c5d7 2004-03-21 devnull if((uint)~r->d.dev){
672 2277c5d7 2004-03-21 devnull respond(r, "wstat -- attempt to change dev");
675 2277c5d7 2004-03-21 devnull if((uchar)~r->d.qid.type || (ulong)~r->d.qid.vers || (uvlong)~r->d.qid.path){
676 2277c5d7 2004-03-21 devnull respond(r, "wstat -- attempt to change qid");
679 2277c5d7 2004-03-21 devnull if(r->d.muid && r->d.muid[0]){
680 2277c5d7 2004-03-21 devnull respond(r, "wstat -- attempt to change muid");
683 2277c5d7 2004-03-21 devnull if((ulong)~r->d.mode && ((r->d.mode&DMDIR)>>24) != (r->fid->qid.type&QTDIR)){
684 2277c5d7 2004-03-21 devnull respond(r, "wstat -- attempt to change DMDIR bit");
687 2277c5d7 2004-03-21 devnull srv->wstat(r);
690 2277c5d7 2004-03-21 devnull static void
691 2277c5d7 2004-03-21 devnull rwstat(Req *r, char *msg)
693 2277c5d7 2004-03-21 devnull USED(r);
694 2277c5d7 2004-03-21 devnull USED(msg);
698 2277c5d7 2004-03-21 devnull srv(Srv *srv)
702 2277c5d7 2004-03-21 devnull fmtinstall('D', dirfmt);
703 2277c5d7 2004-03-21 devnull fmtinstall('F', fcallfmt);
705 2277c5d7 2004-03-21 devnull if(srv->fpool == nil)
706 2277c5d7 2004-03-21 devnull srv->fpool = allocfidpool(srv->destroyfid);
707 2277c5d7 2004-03-21 devnull if(srv->rpool == nil)
708 2277c5d7 2004-03-21 devnull srv->rpool = allocreqpool(srv->destroyreq);
709 2277c5d7 2004-03-21 devnull if(srv->msize == 0)
710 2277c5d7 2004-03-21 devnull srv->msize = 8192+IOHDRSZ;
712 2277c5d7 2004-03-21 devnull changemsize(srv, srv->msize);
714 2277c5d7 2004-03-21 devnull srv->fpool->srv = srv;
715 2277c5d7 2004-03-21 devnull srv->rpool->srv = srv;
717 2aa7d303 2005-02-11 devnull if(srv->start)
718 2aa7d303 2005-02-11 devnull srv->start(srv);
720 2277c5d7 2004-03-21 devnull while(r = getreq(srv)){
721 2277c5d7 2004-03-21 devnull if(r->error){
722 2277c5d7 2004-03-21 devnull respond(r, r->error);
723 2277c5d7 2004-03-21 devnull continue;
725 2277c5d7 2004-03-21 devnull switch(r->ifcall.type){
726 2277c5d7 2004-03-21 devnull default:
727 2277c5d7 2004-03-21 devnull respond(r, "unknown message");
729 2277c5d7 2004-03-21 devnull case Tversion: sversion(srv, r); break;
730 2277c5d7 2004-03-21 devnull case Tauth: sauth(srv, r); break;
731 2277c5d7 2004-03-21 devnull case Tattach: sattach(srv, r); break;
732 2277c5d7 2004-03-21 devnull case Tflush: sflush(srv, r); break;
733 2277c5d7 2004-03-21 devnull case Twalk: swalk(srv, r); break;
734 2277c5d7 2004-03-21 devnull case Topen: sopen(srv, r); break;
735 2277c5d7 2004-03-21 devnull case Tcreate: screate(srv, r); break;
736 2277c5d7 2004-03-21 devnull case Tread: sread(srv, r); break;
737 2277c5d7 2004-03-21 devnull case Twrite: swrite(srv, r); break;
738 2277c5d7 2004-03-21 devnull case Tclunk: sclunk(srv, r); break;
739 2277c5d7 2004-03-21 devnull case Tremove: sremove(srv, r); break;
740 2277c5d7 2004-03-21 devnull case Tstat: sstat(srv, r); break;
741 2277c5d7 2004-03-21 devnull case Twstat: swstat(srv, r); break;
745 2277c5d7 2004-03-21 devnull if(srv->end)
746 2277c5d7 2004-03-21 devnull srv->end(srv);
750 2277c5d7 2004-03-21 devnull respond(Req *r, char *error)
752 2277c5d7 2004-03-21 devnull int i, m, n;
753 2277c5d7 2004-03-21 devnull char errbuf[ERRMAX];
754 2277c5d7 2004-03-21 devnull Srv *srv;
756 2277c5d7 2004-03-21 devnull srv = r->srv;
757 2277c5d7 2004-03-21 devnull assert(srv != nil);
759 39e5957a 2006-02-05 devnull if(r->responded){
760 39e5957a 2006-02-05 devnull assert(r->pool);
761 39e5957a 2006-02-05 devnull goto free;
764 2277c5d7 2004-03-21 devnull assert(r->responded == 0);
765 2277c5d7 2004-03-21 devnull r->error = error;
767 2277c5d7 2004-03-21 devnull switch(r->ifcall.type){
768 2277c5d7 2004-03-21 devnull default:
769 2277c5d7 2004-03-21 devnull assert(0);
771 2277c5d7 2004-03-21 devnull * Flush is special. If the handler says so, we return
772 2277c5d7 2004-03-21 devnull * without further processing. Respond will be called
773 2277c5d7 2004-03-21 devnull * again once it is safe.
775 2277c5d7 2004-03-21 devnull case Tflush:
776 2277c5d7 2004-03-21 devnull if(rflush(r, error)<0)
779 2277c5d7 2004-03-21 devnull case Tversion: rversion(r, error); break;
780 2277c5d7 2004-03-21 devnull case Tauth: rauth(r, error); break;
781 2277c5d7 2004-03-21 devnull case Tattach: rattach(r, error); break;
782 2277c5d7 2004-03-21 devnull case Twalk: rwalk(r, error); break;
783 2277c5d7 2004-03-21 devnull case Topen: ropen(r, error); break;
784 2277c5d7 2004-03-21 devnull case Tcreate: rcreate(r, error); break;
785 2277c5d7 2004-03-21 devnull case Tread: rread(r, error); break;
786 2277c5d7 2004-03-21 devnull case Twrite: rwrite(r, error); break;
787 2277c5d7 2004-03-21 devnull case Tclunk: rclunk(r, error); break;
788 2277c5d7 2004-03-21 devnull case Tremove: rremove(r, error, errbuf); break;
789 2277c5d7 2004-03-21 devnull case Tstat: rstat(r, error); break;
790 2277c5d7 2004-03-21 devnull case Twstat: rwstat(r, error); break;
793 2277c5d7 2004-03-21 devnull r->ofcall.tag = r->ifcall.tag;
794 2277c5d7 2004-03-21 devnull r->ofcall.type = r->ifcall.type+1;
795 2277c5d7 2004-03-21 devnull if(r->error)
796 2277c5d7 2004-03-21 devnull setfcallerror(&r->ofcall, r->error);
798 9b4a2324 2009-07-09 rsc if(srv->fake)
801 2277c5d7 2004-03-21 devnull if(chatty9p)
802 2277c5d7 2004-03-21 devnull fprint(2, "-%d-> %F\n", srv->outfd, &r->ofcall);
804 2277c5d7 2004-03-21 devnull qlock(&srv->wlock);
805 74dd0321 2010-12-07 rsc n = convS2M(&r->ofcall, srv->wbuf, srv->msize);
806 2277c5d7 2004-03-21 devnull if(n <= 0){
807 2277c5d7 2004-03-21 devnull fprint(2, "n = %d %F\n", n, &r->ofcall);
808 2277c5d7 2004-03-21 devnull abort();
810 2277c5d7 2004-03-21 devnull assert(n > 2);
812 aff51ee5 2006-03-21 devnull * There is a race here - we must remove the entry before
813 aff51ee5 2006-03-21 devnull * the write, so that if the client is very fast and reuses the
814 aff51ee5 2006-03-21 devnull * tag, the read loop won't think it is still in use.
816 aff51ee5 2006-03-21 devnull * By removing the entry before the write, we open up a
817 aff51ee5 2006-03-21 devnull * race with incoming Tflush messages. Specifically, an
818 aff51ee5 2006-03-21 devnull * incoming Tflush might not see r even though it has not
819 aff51ee5 2006-03-21 devnull * yet been responded to. It would then send an Rflush
820 aff51ee5 2006-03-21 devnull * immediately, potentially before we do the write. This can't
821 aff51ee5 2006-03-21 devnull * happen because we already old srv->wlock, so nothing
822 aff51ee5 2006-03-21 devnull * is going out on the wire before this write.
824 2277c5d7 2004-03-21 devnull if(r->pool) /* not a fake */
825 2277c5d7 2004-03-21 devnull closereq(removereq(r->pool, r->ifcall.tag));
827 aff51ee5 2006-03-21 devnull qlock(&r->lk);
828 aff51ee5 2006-03-21 devnull r->responded = 1;
829 aff51ee5 2006-03-21 devnull if(r->pool)
830 aff51ee5 2006-03-21 devnull if(r->ref.ref == 1+r->nflush)
831 aff51ee5 2006-03-21 devnull if(r->fid){
833 aff51ee5 2006-03-21 devnull * There are no references other than in our r->flush array,
834 aff51ee5 2006-03-21 devnull * so no one else should be accessing r concurrently.
835 aff51ee5 2006-03-21 devnull * Close the fid now, before responding to the message.
837 aff51ee5 2006-03-21 devnull * If the client is behaving (there are no outstanding T-messages
838 aff51ee5 2006-03-21 devnull * that reference r->fid) and the message is a Tclunk or Tremove,
839 aff51ee5 2006-03-21 devnull * then this closefid will call destroyfid.
841 aff51ee5 2006-03-21 devnull * This means destroyfid can't piddle around
842 aff51ee5 2006-03-21 devnull * indefinitely (we're holding srv->wlock!), but it provides
843 aff51ee5 2006-03-21 devnull * for tighter semantics as to when destroyfid is called.
845 aff51ee5 2006-03-21 devnull * LANL has observed cases where waiting until after the write
846 aff51ee5 2006-03-21 devnull * can delay a closefid on a Twrite for many 9P transactions,
847 aff51ee5 2006-03-21 devnull * so that a handful of transactions can happen including a Tclunk
848 aff51ee5 2006-03-21 devnull * and a Topen, and the original fid will still not be destroyed.
850 aff51ee5 2006-03-21 devnull closefid(r->fid);
851 aff51ee5 2006-03-21 devnull r->fid = nil;
853 aff51ee5 2006-03-21 devnull qunlock(&r->lk);
854 2277c5d7 2004-03-21 devnull m = write(srv->outfd, srv->wbuf, n);
855 2277c5d7 2004-03-21 devnull if(m != n)
856 2277c5d7 2004-03-21 devnull sysfatal("lib9p srv: write %d returned %d on fd %d: %r", n, m, srv->outfd);
857 2277c5d7 2004-03-21 devnull qunlock(&srv->wlock);
860 2277c5d7 2004-03-21 devnull qlock(&r->lk); /* no one will add flushes now */
862 90a35657 2006-04-19 devnull for(i=0; i<r->nflush; i++){
863 90a35657 2006-04-19 devnull r->flush[i]->oldreq = nil; /* so it doesn't try to lock us! */
864 2277c5d7 2004-03-21 devnull respond(r->flush[i], nil);
866 2277c5d7 2004-03-21 devnull free(r->flush);
867 39e5957a 2006-02-05 devnull r->nflush = 0;
868 39e5957a 2006-02-05 devnull r->flush = nil;
869 39e5957a 2006-02-05 devnull qunlock(&r->lk);
871 2277c5d7 2004-03-21 devnull if(r->pool)
872 2277c5d7 2004-03-21 devnull closereq(r);
874 2277c5d7 2004-03-21 devnull free(r);
878 2277c5d7 2004-03-21 devnull postfd(char *name, int pfd)
881 2277c5d7 2004-03-21 devnull char buf[80];
883 2277c5d7 2004-03-21 devnull snprint(buf, sizeof buf, "/srv/%s", name);
884 2277c5d7 2004-03-21 devnull if(chatty9p)
885 2277c5d7 2004-03-21 devnull fprint(2, "postfd %s\n", buf);
886 2277c5d7 2004-03-21 devnull fd = create(buf, OWRITE|ORCLOSE|OCEXEC, 0600);
887 2277c5d7 2004-03-21 devnull if(fd < 0){
888 2277c5d7 2004-03-21 devnull if(chatty9p)
889 2277c5d7 2004-03-21 devnull fprint(2, "create fails: %r\n");
890 2277c5d7 2004-03-21 devnull return -1;
892 2277c5d7 2004-03-21 devnull if(fprint(fd, "%d", pfd) < 0){
893 2277c5d7 2004-03-21 devnull if(chatty9p)
894 2277c5d7 2004-03-21 devnull fprint(2, "write fails: %r\n");
895 2277c5d7 2004-03-21 devnull close(fd);
896 2277c5d7 2004-03-21 devnull return -1;
898 2277c5d7 2004-03-21 devnull if(chatty9p)
899 2277c5d7 2004-03-21 devnull fprint(2, "postfd successful\n");
900 2277c5d7 2004-03-21 devnull return 0;