#include "stdinc.h"
#include "9.h"
enum {
OMODE = 0x7, /* Topen/Tcreate mode */
};
enum {
PermX = 1,
PermW = 2,
PermR = 4,
};
static char EPermission[] = "permission denied";
static int
permFile(File* file, Fid* fid, int perm)
{
char *u;
DirEntry de;
if(!fileGetDir(file, &de))
return -1;
/*
* User none only gets other permissions.
*/
if(strcmp(fid->uname, unamenone) != 0){
/*
* There is only one uid<->uname mapping
* and it's already cached in the Fid, but
* it might have changed during the lifetime
* if this Fid.
*/
if((u = unameByUid(de.uid)) != nil){
if(strcmp(fid->uname, u) == 0 && ((perm<<6) & de.mode)){
vtMemFree(u);
deCleanup(&de);
return 1;
}
vtMemFree(u);
}
if(groupMember(de.gid, fid->uname) && ((perm<<3) & de.mode)){
deCleanup(&de);
return 1;
}
}
if(perm & de.mode){
if(perm == PermX && (de.mode & ModeDir)){
deCleanup(&de);
return 1;
}
if(!groupMember(uidnoworld, fid->uname)){
deCleanup(&de);
return 1;
}
}
if(fsysNoPermCheck(fid->fsys) || fid->con->noperm){
deCleanup(&de);
return 1;
}
vtSetError(EPermission);
deCleanup(&de);
return 0;
}
static int
permFid(Fid* fid, int p)
{
return permFile(fid->file, fid, p);
}
static int
permParent(Fid* fid, int p)
{
int r;
File *parent;
parent = fileGetParent(fid->file);
r = permFile(parent, fid, p);
fileDecRef(parent);
return r;
}
int
validFileName(char* name)
{
char *p;
if(name == nil || name[0] == '\0'){
vtSetError("no file name");
return 0;
}
if(name[0] == '.'){
if(name[1] == '\0' || (name[1] == '.' && name[2] == '\0')){
vtSetError(". and .. illegal as file name");
return 0;
}
}
for(p = name; *p != '\0'; p++){
if((*p & 0xFF) < 040){
vtSetError("bad character in file name");
return 0;
}
}
return 1;
}
static int
rTwstat(Msg* m)
{
Dir dir;
Fid *fid;
ulong mode, oldmode;
DirEntry de;
char *gid, *strs, *uid;
int gl, op, retval, tsync;
if((fid = fidGet(m->con, m->t.fid, FidFWlock)) == nil)
return 0;
gid = uid = nil;
retval = 0;
if(strcmp(fid->uname, unamenone) == 0 || (fid->qid.type & QTAUTH)){
vtSetError(EPermission);
goto error0;
}
if(fileIsRoFs(fid->file) || !groupWriteMember(fid->uname)){
vtSetError("read-only filesystem");
goto error0;
}
if(!fileGetDir(fid->file, &de))
goto error0;
strs = vtMemAlloc(m->t.nstat);
if(convM2D(m->t.stat, m->t.nstat, &dir, strs) == 0){
vtSetError("wstat -- protocol botch");
goto error;
}
/*
* Run through each of the (sub-)fields in the provided Dir
* checking for validity and whether it's a default:
* .type, .dev and .atime are completely ignored and not checked;
* .qid.path, .qid.vers and .muid are checked for validity but
* any attempt to change them is an error.
* .qid.type/.mode, .mtime, .name, .length, .uid and .gid can
* possibly be changed.
*
* 'Op' flags there are changed fields, i.e. it's not a no-op.
* 'Tsync' flags all fields are defaulted.
*/
tsync = 1;
if(dir.qid.path != ~0){
if(dir.qid.path != de.qid){
vtSetError("wstat -- attempt to change qid.path");
goto error;
}
tsync = 0;
}
if(dir.qid.vers != ~0){
if(dir.qid.vers != de.mcount){
vtSetError("wstat -- attempt to change qid.vers");
goto error;
}
tsync = 0;
}
if(dir.muid != nil && *dir.muid != '\0'){
if((uid = uidByUname(dir.muid)) == nil){
vtSetError("wstat -- unknown muid");
goto error;
}
if(strcmp(uid, de.mid) != 0){
vtSetError("wstat -- attempt to change muid");
goto error;
}
vtMemFree(uid);
uid = nil;
tsync = 0;
}
/*
* Check .qid.type and .mode agree if neither is defaulted.
*/
if(dir.qid.type != (uchar)~0 && dir.mode != ~0){
if(dir.qid.type != ((dir.mode>>24) & 0xFF)){
vtSetError("wstat -- qid.type/mode mismatch");
goto error;
}
}
op = 0;
oldmode = de.mode;
if(dir.qid.type != (uchar)~0 || dir.mode != ~0){
/*
* .qid.type or .mode isn't defaulted, check for unknown bits.
*/
if(dir.mode == ~0)
dir.mode = (dir.qid.type<<24)|(de.mode & 0777);
if(dir.mode & ~(DMDIR|DMAPPEND|DMEXCL|DMTMP|0777)){
vtSetError("wstat -- unknown bits in qid.type/mode");
goto error;
}
/*
* Synthesise a mode to check against the current settings.
*/
mode = dir.mode & 0777;
if(dir.mode & DMEXCL)
mode |= ModeExclusive;
if(dir.mode & DMAPPEND)
mode |= ModeAppend;
if(dir.mode & DMDIR)
mode |= ModeDir;
if(dir.mode & DMTMP)
mode |= ModeTemporary;
if((de.mode^mode) & ModeDir){
vtSetError("wstat -- attempt to change directory bit");
goto error;
}
if((de.mode & (ModeAppend|ModeExclusive|ModeTemporary|0777)) != mode){
de.mode &= ~(ModeAppend|ModeExclusive|ModeTemporary|0777);
de.mode |= mode;
op = 1;
}
tsync = 0;
}
if(dir.mtime != ~0){
if(dir.mtime != de.mtime){
de.mtime = dir.mtime;
op = 1;
}
tsync = 0;
}
if(dir.length != ~0){
if(dir.length != de.size){
/*
* Cannot change length on append-only files.
* If we're changing the append bit, it's okay.
*/
if(de.mode & oldmode & ModeAppend){
vtSetError("wstat -- attempt to change length of append-only file");
goto error;
}
if(de.mode & ModeDir){
vtSetError("wstat -- attempt to change length of directory");
goto error;
}
de.size = dir.length;
op = 1;
}
tsync = 0;
}
/*
* Check for permission to change .mode, .mtime or .length,
* must be owner or leader of either group, for which test gid
* is needed; permission checks on gid will be done later.
*/
if(dir.gid != nil && *dir.gid != '\0'){
if((gid = uidByUname(dir.gid)) == nil){
vtSetError("wstat -- unknown gid");
goto error;
}
tsync = 0;
}
else
gid = vtStrDup(de.gid);
/*
* 'Gl' counts whether neither, one or both groups are led.
*/
gl = groupLeader(gid, fid->uname) != 0;
gl += groupLeader(de.gid, fid->uname) != 0;
if(op && !(fsysWstatAllow(fid->fsys) || m->con->wstatallow)){
if(strcmp(fid->uid, de.uid) != 0 && !gl){
vtSetError("wstat -- not owner or group leader");
goto error;
}
}
/*
* Check for permission to change group, must be
* either owner and in new group or leader of both groups.
* If gid is nil here then
*/
if(strcmp(gid, de.gid) != 0){
if(!(fsysWstatAllow(fid->fsys) || m->con->wstatallow)
&& !(strcmp(fid->uid, de.uid) == 0 && groupMember(gid, fid->uname))
&& !(gl == 2)){
vtSetError("wstat -- not owner and not group leaders");
goto error;
}
vtMemFree(de.gid);
de.gid = gid;
gid = nil;
op = 1;
tsync = 0;
}
/*
* Rename.
* Check .name is valid and different to the current.
* If so, check write permission in parent.
*/
if(dir.name != nil && *dir.name != '\0'){
if(!validFileName(dir.name))
goto error;
if(strcmp(dir.name, de.elem) != 0){
if(permParent(fid, PermW) <= 0)
goto error;
vtMemFree(de.elem);
de.elem = vtStrDup(dir.name);
op = 1;
}
tsync = 0;
}
/*
* Check for permission to change owner - must be god.
*/
if(dir.uid != nil && *dir.uid != '\0'){
if((uid = uidByUname(dir.uid)) == nil){
vtSetError("wstat -- unknown uid");
goto error;
}
if(strcmp(uid, de.uid) != 0){
if(!(fsysWstatAllow(fid->fsys) || m->con->wstatallow)){
vtSetError("wstat -- not owner");
goto error;
}
if(strcmp(uid, uidnoworld) == 0){
vtSetError(EPermission);
goto error;
}
vtMemFree(de.uid);
de.uid = uid;
uid = nil;
op = 1;
}
tsync = 0;
}
if(op)
retval = fileSetDir(fid->file, &de, fid->uid);
else
retval = 1;
if(tsync){
/*
* All values were defaulted,
* make the state of the file exactly what it
* claims to be before returning...
*/
USED(tsync);
}
error:
deCleanup(&de);
vtMemFree(strs);
if(gid != nil)
vtMemFree(gid);
if(uid != nil)
vtMemFree(uid);
error0:
fidPut(fid);
return retval;
};
static int
rTstat(Msg* m)
{
Dir dir;
Fid *fid;
DirEntry de;
if((fid = fidGet(m->con, m->t.fid, 0)) == nil)
return 0;
if(fid->qid.type & QTAUTH){
memset(&dir, 0, sizeof(Dir));
dir.qid = fid->qid;
dir.mode = DMAUTH;
dir.atime = time(0L);
dir.mtime = dir.atime;
dir.length = 0;
dir.name = "#¿";
dir.uid = fid->uname;
dir.gid = fid->uname;
dir.muid = fid->uname;
if((m->r.nstat = convD2M(&dir, m->data, m->con->msize)) == 0){
vtSetError("stat QTAUTH botch");
fidPut(fid);
return 0;
}
m->r.stat = m->data;
fidPut(fid);
return 1;
}
if(!fileGetDir(fid->file, &de)){
fidPut(fid);
return 0;
}
fidPut(fid);
/*
* TODO: optimise this copy (in convS2M) away somehow.
* This pettifoggery with m->data will do for the moment.
*/
m->r.nstat = dirDe2M(&de, m->data, m->con->msize);
m->r.stat = m->data;
deCleanup(&de);
return 1;
}
static int
_rTclunk(Fid* fid, int remove)
{
int rok;
if(fid->excl)
exclFree(fid);
rok = 1;
if(remove && !(fid->qid.type & QTAUTH)){
if((rok = permParent(fid, PermW)) > 0)
rok = fileRemove(fid->file, fid->uid);
}
fidClunk(fid);
return rok;
}
static int
rTremove(Msg* m)
{
Fid *fid;
if((fid = fidGet(m->con, m->t.fid, FidFWlock)) == nil)
return 0;
return _rTclunk(fid, 1);
}
static int
rTclunk(Msg* m)
{
Fid *fid;
if((fid = fidGet(m->con, m->t.fid, FidFWlock)) == nil)
return 0;
_rTclunk(fid, (fid->open & FidORclose));
return 1;
}
static int
rTwrite(Msg* m)
{
Fid *fid;
int count, n;
if((fid = fidGet(m->con, m->t.fid, 0)) == nil)
return 0;
if(!(fid->open & FidOWrite)){
vtSetError("fid not open for write");
goto error;
}
count = m->t.count;
if(count < 0 || count > m->con->msize-IOHDRSZ){
vtSetError("write count too big");
goto error;
}
if(m->t.offset < 0){
vtSetError("write offset negative");
goto error;
}
if(fid->excl != nil && !exclUpdate(fid))
goto error;
if(fid->qid.type & QTDIR){
vtSetError("is a directory");
goto error;
}
else if(fid->qid.type & QTAUTH)
n = authWrite(fid, m->t.data, count);
else
n = fileWrite(fid->file, m->t.data, count, m->t.offset, fid->uid);
if(n < 0)
goto error;
m->r.count = n;
fidPut(fid);
return 1;
error:
fidPut(fid);
return 0;
}
static int
rTread(Msg* m)
{
Fid *fid;
uchar *data;
int count, n;
if((fid = fidGet(m->con, m->t.fid, 0)) == nil)
return 0;
if(!(fid->open & FidORead)){
vtSetError("fid not open for read");
goto error;
}
count = m->t.count;
if(count < 0 || count > m->con->msize-IOHDRSZ){
vtSetError("read count too big");
goto error;
}
if(m->t.offset < 0){
vtSetError("read offset negative");
goto error;
}
if(fid->excl != nil && !exclUpdate(fid))
goto error;
/*
* TODO: optimise this copy (in convS2M) away somehow.
* This pettifoggery with m->data will do for the moment.
*/
data = m->data+IOHDRSZ;
if(fid->qid.type & QTDIR)
n = dirRead(fid, data, count, m->t.offset);
else if(fid->qid.type & QTAUTH)
n = authRead(fid, data, count);
else
n = fileRead(fid->file, data, count, m->t.offset);
if(n < 0)
goto error;
m->r.count = n;
m->r.data = (char*)data;
fidPut(fid);
return 1;
error:
fidPut(fid);
return 0;
}
static int
rTcreate(Msg* m)
{
Fid *fid;
File *file;
ulong mode;
int omode, open, perm;
if((fid = fidGet(m->con, m->t.fid, FidFWlock)) == nil)
return 0;
if(fid->open){
vtSetError("fid open for I/O");
goto error;
}
if(fileIsRoFs(fid->file) || !groupWriteMember(fid->uname)){
vtSetError("read-only filesystem");
goto error;
}
if(!fileIsDir(fid->file)){
vtSetError("not a directory");
goto error;
}
if(permFid(fid, PermW) <= 0)
goto error;
if(!validFileName(m->t.name))
goto error;
if(strcmp(fid->uid, uidnoworld) == 0){
vtSetError(EPermission);
goto error;
}
omode = m->t.mode & OMODE;
open = 0;
if(omode == OREAD || omode == ORDWR || omode == OEXEC)
open |= FidORead;
if(omode == OWRITE || omode == ORDWR)
open |= FidOWrite;
if((open & (FidOWrite|FidORead)) == 0){
vtSetError("unknown mode");
goto error;
}
if(m->t.perm & DMDIR){
if((m->t.mode & (ORCLOSE|OTRUNC)) || (open & FidOWrite)){
vtSetError("illegal mode");
goto error;
}
if(m->t.perm & DMAPPEND){
vtSetError("illegal perm");
goto error;
}
}
mode = fileGetMode(fid->file);
perm = m->t.perm;
if(m->t.perm & DMDIR)
perm &= ~0777|(mode & 0777);
else
perm &= ~0666|(mode & 0666);
mode = perm & 0777;
if(m->t.perm & DMDIR)
mode |= ModeDir;
if(m->t.perm & DMAPPEND)
mode |= ModeAppend;
if(m->t.perm & DMEXCL)
mode |= ModeExclusive;
if(m->t.perm & DMTMP)
mode |= ModeTemporary;
if((file = fileCreate(fid->file, m->t.name, mode, fid->uid)) == nil){
fidPut(fid);
return 0;
}
fileDecRef(fid->file);
fid->qid.vers = fileGetMcount(file);
fid->qid.path = fileGetId(file);
fid->file = file;
mode = fileGetMode(fid->file);
if(mode & ModeDir)
fid->qid.type = QTDIR;
else
fid->qid.type = QTFILE;
if(mode & ModeAppend)
fid->qid.type |= QTAPPEND;
if(mode & ModeExclusive){
fid->qid.type |= QTEXCL;
assert(exclAlloc(fid) != 0);
}
if(m->t.mode & ORCLOSE)
open |= FidORclose;
fid->open = open;
m->r.qid = fid->qid;
m->r.iounit = m->con->msize-IOHDRSZ;
fidPut(fid);
return 1;
error:
fidPut(fid);
return 0;
}
static int
rTopen(Msg* m)
{
Fid *fid;
int isdir, mode, omode, open, rofs;
if((fid = fidGet(m->con, m->t.fid, FidFWlock)) == nil)
return 0;
if(fid->open){
vtSetError("fid open for I/O");
goto error;
}
isdir = fileIsDir(fid->file);
open = 0;
rofs = fileIsRoFs(fid->file) || !groupWriteMember(fid->uname);
if(m->t.mode & ORCLOSE){
if(isdir){
vtSetError("is a directory");
goto error;
}
if(rofs){
vtSetError("read-only filesystem");
goto error;
}
if(permParent(fid, PermW) <= 0)
goto error;
open |= FidORclose;
}
omode = m->t.mode & OMODE;
if(omode == OREAD || omode == ORDWR){
if(permFid(fid, PermR) <= 0)
goto error;
open |= FidORead;
}
if(omode == OWRITE || omode == ORDWR || (m->t.mode & OTRUNC)){
if(isdir){
vtSetError("is a directory");
goto error;
}
if(rofs){
vtSetError("read-only filesystem");
goto error;
}
if(permFid(fid, PermW) <= 0)
goto error;
open |= FidOWrite;
}
if(omode == OEXEC){
if(isdir){
vtSetError("is a directory");
goto error;
}
if(permFid(fid, PermX) <= 0)
goto error;
open |= FidORead;
}
if((open & (FidOWrite|FidORead)) == 0){
vtSetError("unknown mode");
goto error;
}
mode = fileGetMode(fid->file);
if((mode & ModeExclusive) && exclAlloc(fid) == 0)
goto error;
/*
* Everything checks out, try to commit any changes.
*/
if((m->t.mode & OTRUNC) && !(mode & ModeAppend)){
if(!fileTruncate(fid->file, fid->uid))
goto error;
fid->qid.vers = fileGetMcount(fid->file);
}
if(isdir && fid->db != nil){
dirBufFree(fid->db);
fid->db = nil;
}
m->r.qid = fid->qid;
m->r.iounit = m->con->msize-IOHDRSZ;
fid->open = open;
fidPut(fid);
return 1;
error:
if(fid->excl != nil)
exclFree(fid);
fidPut(fid);
return 0;
}
static int
rTwalk(Msg* m)
{
Qid qid;
Fcall *r, *t;
int nwname, wlock;
File *file, *nfile;
Fid *fid, *ofid, *nfid;
t = &m->t;
if(t->fid == t->newfid)
wlock = FidFWlock;
else
wlock = 0;
/*
* The file identified by t->fid must be valid in the
* current session and must not have been opened for I/O
* by an open or create message.
*/
if((ofid = fidGet(m->con, t->fid, wlock)) == nil)
return 0;
if(ofid->open){
vtSetError("file open for I/O");
fidPut(ofid);
return 0;
}
/*
* If newfid is not the same as fid, allocate a new file;
* a side effect is checking newfid is not already in use (error);
* if there are no names to walk this will be equivalent to a
* simple 'clone' operation.
* It's a no-op if newfid is the same as fid and t->nwname is 0.
*/
nfid = nil;
if(t->fid != t->newfid){
nfid = fidGet(m->con, t->newfid, FidFWlock|FidFCreate);
if(nfid == nil){
vtSetError("fid in use");
fidPut(ofid);
return 0;
}
nfid->open = ofid->open & ~FidORclose;
nfid->file = fileIncRef(ofid->file);
nfid->qid = ofid->qid;
nfid->uid = vtStrDup(ofid->uid);
nfid->uname = vtStrDup(ofid->uname);
nfid->fsys = fsysIncRef(ofid->fsys);
fid = nfid;
}
else
fid = ofid;
r = &m->r;
r->nwqid = 0;
if(t->nwname == 0){
if(nfid != nil)
fidPut(nfid);
fidPut(ofid);
return 1;
}
file = fid->file;
fileIncRef(file);
qid = fid->qid;
for(nwname = 0; nwname < t->nwname; nwname++){
/*
* Walked elements must represent a directory and
* the implied user must have permission to search
* the directory. Walking .. is always allowed, so that
* you can't walk into a directory and then not be able
* to walk out of it.
*/
if(!(qid.type & QTDIR)){
vtSetError("not a directory");
break;
}
switch(permFile(file, fid, PermX)){
case 1:
break;
case 0:
if(strcmp(t->wname[nwname], "..") == 0)
break;
case -1:
goto Out;
}
if((nfile = fileWalk(file, t->wname[nwname])) == nil)
break;
fileDecRef(file);
file = nfile;
qid.type = QTFILE;
if(fileIsDir(file))
qid.type = QTDIR;
qid.vers = fileGetMcount(file);
qid.path = fileGetId(file);
r->wqid[r->nwqid++] = qid;
}
if(nwname == t->nwname){
/*
* Walked all elements. Update the target fid
* from the temporary qid used during the walk,
* and tidy up.
*/
fid->qid = r->wqid[r->nwqid-1];
fileDecRef(fid->file);
fid->file = file;
if(nfid != nil)
fidPut(nfid);
fidPut(ofid);
return 1;
}
Out:
/*
* Didn't walk all elements, 'clunk' nfid if it exists
* and leave fid untouched.
* It's not an error if some of the elements were walked OK.
*/
fileDecRef(file);
if(nfid != nil)
fidClunk(nfid);
fidPut(ofid);
if(nwname == 0)
return 0;
return 1;
}
static int
rTflush(Msg* m)
{
if(m->t.oldtag != NOTAG)
msgFlush(m);
return 1;
}
static void
parseAname(char *aname, char **fsname, char **path)
{
char *s;
if(aname && aname[0])
s = vtStrDup(aname);
else
s = vtStrDup("main/active");
*fsname = s;
if((*path = strchr(s, '/')) != nil)
*(*path)++ = '\0';
else
*path = "";
}
static int
rTattach(Msg* m)
{
Fid *fid;
Fsys *fsys;
char *fsname, *path;
if((fid = fidGet(m->con, m->t.fid, FidFWlock|FidFCreate)) == nil)
return 0;
parseAname(m->t.aname, &fsname, &path);
if((fsys = fsysGet(fsname)) == nil){
fidClunk(fid);
vtMemFree(fsname);
return 0;
}
fid->fsys = fsys;
if(m->t.uname[0] != '\0')
fid->uname = vtStrDup(m->t.uname);
else
fid->uname = vtStrDup(unamenone);
if(fsysNoAuthCheck(fsys) || m->con->noauth){
if((fid->uid = uidByUname(fid->uname)) == nil)
fid->uid = vtStrDup(unamenone);
}
else if(!authCheck(&m->t, fid, fsys)){
fidClunk(fid);
vtMemFree(fsname);
vtSetError("authentication failed");
return 0;
}
fsysFsRlock(fsys);
if((fid->file = fsysGetRoot(fsys, path)) == nil){
fsysFsRUnlock(fsys);
fidClunk(fid);
vtMemFree(fsname);
return 0;
}
fsysFsRUnlock(fsys);
vtMemFree(fsname);
fid->qid = (Qid){fileGetId(fid->file), 0, QTDIR};
m->r.qid = fid->qid;
fidPut(fid);
return 1;
}
static int
rTauth(Msg* m)
{
int afd;
Con *con;
Fid *afid;
Fsys *fsys;
char *fsname, *path;
parseAname(m->t.aname, &fsname, &path);
if((fsys = fsysGet(fsname)) == nil){
vtMemFree(fsname);
return 0;
}
vtMemFree(fsname);
if(fsysNoAuthCheck(fsys) || m->con->noauth){
m->con->aok = 1;
vtSetError("authentication disabled");
fsysPut(fsys);
return 0;
}
if(strcmp(m->t.uname, unamenone) == 0){
vtSetError("user 'none' requires no authentication");
fsysPut(fsys);
return 0;
}
con = m->con;
if((afid = fidGet(con, m->t.afid, FidFWlock|FidFCreate)) == nil){
fsysPut(fsys);
return 0;
}
afid->fsys = fsys;
if((afd = open("/mnt/factotum/rpc", ORDWR)) < 0){
vtSetError("can't open \"/mnt/factotum/rpc\"");
fidClunk(afid);
return 0;
}
if((afid->rpc = auth_allocrpc(afd)) == nil){
close(afd);
vtSetError("can't auth_allocrpc");
fidClunk(afid);
return 0;
}
if(auth_rpc(afid->rpc, "start", "proto=p9any role=server", 23) != ARok){
vtSetError("can't auth_rpc");
fidClunk(afid);
return 0;
}
afid->open = FidOWrite|FidORead;
afid->qid.type = QTAUTH;
afid->qid.path = m->t.afid;
afid->uname = vtStrDup(m->t.uname);
m->r.qid = afid->qid;
fidPut(afid);
return 1;
}
static int
rTversion(Msg* m)
{
int v;
Con *con;
Fcall *r, *t;
t = &m->t;
r = &m->r;
con = m->con;
vtLock(con->lock);
if(con->state != ConInit){
vtUnlock(con->lock);
vtSetError("Tversion: down");
return 0;
}
con->state = ConNew;
/*
* Release the karma of past lives and suffering.
* Should this be done before or after checking the
* validity of the Tversion?
*/
fidClunkAll(con);
if(t->tag != NOTAG){
vtUnlock(con->lock);
vtSetError("Tversion: invalid tag");
return 0;
}
if(t->msize < 256){
vtUnlock(con->lock);
vtSetError("Tversion: message size too small");
return 0;
}
if(t->msize < con->msize)
r->msize = t->msize;
else
r->msize = con->msize;
r->version = "unknown";
if(t->version[0] == '9' && t->version[1] == 'P'){
/*
* Currently, the only defined version
* is "9P2000"; ignore any later versions.
*/
v = strtol(&t->version[2], 0, 10);
if(v >= 2000){
r->version = VERSION9P;
con->msize = r->msize;
con->state = ConUp;
}
else if(strcmp(t->version, "9PEoF") == 0){
r->version = "9PEoF";
con->msize = r->msize;
con->state = ConMoribund;
/*
* Don't want to attempt to write this
* message as the connection may be already
* closed.
*/
m->state = MsgF;
}
}
vtUnlock(con->lock);
return 1;
}
int (*rFcall[Tmax])(Msg*) = {
[Tversion] = rTversion,
[Tauth] = rTauth,
[Tattach] = rTattach,
[Tflush] = rTflush,
[Twalk] = rTwalk,
[Topen] = rTopen,
[Tcreate] = rTcreate,
[Tread] = rTread,
[Twrite] = rTwrite,
[Tclunk] = rTclunk,
[Tremove] = rTremove,
[Tstat] = rTstat,
[Twstat] = rTwstat,
};
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