blob: cd20570ce1a3ed2bdb1858e0c09fb82514a373de [file] [log] [blame]
#include <u.h>
#include <libc.h>
#include <auth.h>
#include <fcall.h>
#include "dat.h"
#include "fns.h"
enum
{
Maxfdata = 8192,
Maxiosize = IOHDRSZ+Maxfdata,
};
void io(int);
void rversion(void);
void rattach(void);
void rauth(void);
void rclunk(void);
void rcreate(void);
void rflush(void);
void ropen(void);
void rread(void);
void rremove(void);
void rsession(void);
void rstat(void);
void rwalk(void);
void rwrite(void);
void rwstat(void);
static int openflags(int);
static void usage(void);
#define Reqsize (sizeof(Fcall)+Maxfdata)
Fcall *req;
Fcall *rep;
uchar mdata[Maxiosize];
char fdata[Maxfdata];
uchar statbuf[STATMAX];
int errno;
extern Xfsub *xsublist[];
extern int nclust;
jmp_buf err_lab[16];
int nerr_lab;
char err_msg[ERRMAX];
int chatty;
int nojoliet;
int noplan9;
int norock;
void (*fcalls[Tmax])(void);
static void
initfcalls(void)
{
fcalls[Tversion]= rversion;
fcalls[Tflush]= rflush;
fcalls[Tauth]= rauth;
fcalls[Tattach]= rattach;
fcalls[Twalk]= rwalk;
fcalls[Topen]= ropen;
fcalls[Tcreate]= rcreate;
fcalls[Tread]= rread;
fcalls[Twrite]= rwrite;
fcalls[Tclunk]= rclunk;
fcalls[Tremove]= rremove;
fcalls[Tstat]= rstat;
fcalls[Twstat]= rwstat;
}
void
main(int argc, char **argv)
{
int srvfd, pipefd[2], stdio;
Xfsub **xs;
char *mtpt;
initfcalls();
stdio = 0;
mtpt = nil;
ARGBEGIN {
case '9':
noplan9 = 1;
break;
case 'c':
nclust = atoi(EARGF(usage()));
if (nclust <= 0)
sysfatal("nclust %d non-positive", nclust);
break;
case 'f':
deffile = EARGF(usage());
break;
case 'r':
norock = 1;
break;
case 's':
stdio = 1;
break;
case 'v':
chatty = 1;
break;
case 'J':
nojoliet = 1;
break;
case 'm':
mtpt = EARGF(usage());
break;
default:
usage();
} ARGEND
switch(argc) {
case 0:
break;
case 1:
srvname = argv[0];
break;
default:
usage();
}
iobuf_init();
for(xs=xsublist; *xs; xs++)
(*(*xs)->reset)();
if(stdio) {
pipefd[0] = 0;
pipefd[1] = 1;
} else {
close(0);
close(1);
open("/dev/null", OREAD);
open("/dev/null", OWRITE);
if(pipe(pipefd) < 0)
panic(1, "pipe");
if(post9pservice(pipefd[0], srvname, mtpt) < 0)
sysfatal("post9pservice: %r");
close(pipefd[0]);
}
srvfd = pipefd[1];
switch(rfork(RFNOWAIT|RFNOTEG|RFFDG|RFPROC)){
case -1:
panic(1, "fork");
default:
_exits(0);
case 0:
break;
}
io(srvfd);
exits(0);
}
void
io(int srvfd)
{
int n, pid;
Fcall xreq, xrep;
req = &xreq;
rep = &xrep;
pid = getpid();
fmtinstall('F', fcallfmt);
for(;;){
/*
* reading from a pipe or a network device
* will give an error after a few eof reads.
* however, we cannot tell the difference
* between a zero-length read and an interrupt
* on the processes writing to us,
* so we wait for the error.
*/
n = read9pmsg(srvfd, mdata, sizeof mdata);
if(n < 0)
break;
if(n == 0)
continue;
if(convM2S(mdata, n, req) == 0)
continue;
if(chatty)
fprint(2, "9660srv %d:<-%F\n", pid, req);
errno = 0;
if(!waserror()){
err_msg[0] = 0;
if(req->type >= nelem(fcalls) || !fcalls[req->type])
error("bad fcall type");
(*fcalls[req->type])();
poperror();
}
if(err_msg[0]){
rep->type = Rerror;
rep->ename = err_msg;
}else{
rep->type = req->type + 1;
rep->fid = req->fid;
}
rep->tag = req->tag;
if(chatty)
fprint(2, "9660srv %d:->%F\n", pid, rep);
n = convS2M(rep, mdata, sizeof mdata);
if(n == 0)
panic(1, "convS2M error on write");
if(write(srvfd, mdata, n) != n)
panic(1, "mount write");
if(nerr_lab != 0)
panic(0, "err stack %d");
}
chat("server shut down");
}
static void
usage(void)
{
fprint(2, "usage: %s [-v] [-9Jr] [-s] [-f devicefile] [srvname]\n", argv0);
exits("usage");
}
void
error(char *p)
{
strecpy(err_msg, err_msg+sizeof err_msg, p);
nexterror();
}
void
nexterror(void)
{
longjmp(err_lab[--nerr_lab], 1);
}
void*
ealloc(long n)
{
void *p;
p = malloc(n);
if(p == 0)
error("no memory");
return p;
}
void
setnames(Dir *d, char *n)
{
d->name = n;
d->uid = n+Maxname;
d->gid = n+Maxname*2;
d->muid = n+Maxname*3;
d->name[0] = '\0';
d->uid[0] = '\0';
d->gid[0] = '\0';
d->muid[0] = '\0';
}
void
rversion(void)
{
if(req->msize > Maxiosize)
rep->msize = Maxiosize;
else
rep->msize = req->msize;
rep->version = "9P2000";
}
void
rauth(void)
{
error("9660srv: authentication not required");
}
void
rflush(void)
{
}
void
rattach(void)
{
Xfs *xf;
Xfile *root;
Xfsub **xs;
chat("attach(fid=%d,uname=\"%s\",aname=\"%s\")...",
req->fid, req->uname, req->aname);
if(waserror()){
xfile(req->fid, Clunk);
nexterror();
}
root = xfile(req->fid, Clean);
root->qid = (Qid){0, 0, QTDIR};
root->xf = xf = ealloc(sizeof(Xfs));
memset(xf, 0, sizeof(Xfs));
xf->ref = 1;
xf->d = getxdata(req->aname);
for(xs=xsublist; *xs; xs++)
if((*(*xs)->attach)(root) >= 0){
poperror();
xf->s = *xs;
xf->rootqid = root->qid;
rep->qid = root->qid;
return;
}
error("unknown format");
}
Xfile*
doclone(Xfile *of, int newfid)
{
Xfile *nf, *next;
nf = xfile(newfid, Clean);
if(waserror()){
xfile(newfid, Clunk);
nexterror();
}
next = nf->next;
*nf = *of;
nf->next = next;
nf->fid = newfid;
refxfs(nf->xf, 1);
if(nf->len){
nf->ptr = ealloc(nf->len);
memmove(nf->ptr, of->ptr, nf->len);
}else
nf->ptr = of->ptr;
(*of->xf->s->clone)(of, nf);
poperror();
return nf;
}
void
rwalk(void)
{
Xfile *f, *nf;
Isofile *oldptr;
int oldlen;
Qid oldqid;
rep->nwqid = 0;
nf = nil;
f = xfile(req->fid, Asis);
if(req->fid != req->newfid)
f = nf = doclone(f, req->newfid);
/* save old state in case of error */
oldqid = f->qid;
oldlen = f->len;
oldptr = f->ptr;
if(oldlen){
oldptr = ealloc(oldlen);
memmove(oldptr, f->ptr, oldlen);
}
if(waserror()){
if(nf != nil)
xfile(req->newfid, Clunk);
if(rep->nwqid == req->nwname){
if(oldlen)
free(oldptr);
}else{
/* restore previous state */
f->qid = oldqid;
if(f->len)
free(f->ptr);
f->ptr = oldptr;
f->len = oldlen;
}
if(rep->nwqid==req->nwname || rep->nwqid > 0){
err_msg[0] = '\0';
return;
}
nexterror();
}
for(rep->nwqid=0; rep->nwqid < req->nwname && rep->nwqid < MAXWELEM; rep->nwqid++){
chat("\twalking %s\n", req->wname[rep->nwqid]);
if(!(f->qid.type & QTDIR)){
chat("\tnot dir: type=%#x\n", f->qid.type);
error("walk in non-directory");
}
if(strcmp(req->wname[rep->nwqid], "..")==0){
if(f->qid.path != f->xf->rootqid.path)
(*f->xf->s->walkup)(f);
}else
(*f->xf->s->walk)(f, req->wname[rep->nwqid]);
rep->wqid[rep->nwqid] = f->qid;
}
poperror();
if(oldlen)
free(oldptr);
}
void
ropen(void)
{
Xfile *f;
f = xfile(req->fid, Asis);
if(f->flags&Omodes)
error("open on open file");
if(req->mode&ORCLOSE)
error("no removes");
(*f->xf->s->open)(f, req->mode);
f->flags = openflags(req->mode);
rep->qid = f->qid;
rep->iounit = 0;
}
void
rcreate(void)
{
error("no creates");
/*
Xfile *f;
if(strcmp(req->name, ".") == 0 || strcmp(req->name, "..") == 0)
error("create . or ..");
f = xfile(req->fid, Asis);
if(f->flags&Omodes)
error("create on open file");
if(!(f->qid.path&CHDIR))
error("create in non-directory");
(*f->xf->s->create)(f, req->name, req->perm, req->mode);
chat("f->qid=0x%8.8lux...", f->qid.path);
f->flags = openflags(req->mode);
rep->qid = f->qid;
*/
}
void
rread(void)
{
Xfile *f;
f=xfile(req->fid, Asis);
if (!(f->flags&Oread))
error("file not opened for reading");
if(f->qid.type & QTDIR)
rep->count = (*f->xf->s->readdir)(f, (uchar*)fdata, req->offset, req->count);
else
rep->count = (*f->xf->s->read)(f, fdata, req->offset, req->count);
rep->data = fdata;
}
void
rwrite(void)
{
Xfile *f;
f=xfile(req->fid, Asis);
if(!(f->flags&Owrite))
error("file not opened for writing");
rep->count = (*f->xf->s->write)(f, req->data, req->offset, req->count);
}
void
rclunk(void)
{
Xfile *f;
if(!waserror()){
f = xfile(req->fid, Asis);
(*f->xf->s->clunk)(f);
poperror();
}
xfile(req->fid, Clunk);
}
void
rremove(void)
{
error("no removes");
}
void
rstat(void)
{
Xfile *f;
Dir dir;
chat("stat(fid=%d)...", req->fid);
f=xfile(req->fid, Asis);
setnames(&dir, fdata);
(*f->xf->s->stat)(f, &dir);
if(chatty)
showdir(2, &dir);
rep->nstat = convD2M(&dir, statbuf, sizeof statbuf);
rep->stat = statbuf;
}
void
rwstat(void)
{
error("no wstat");
}
static int
openflags(int mode)
{
int flags = 0;
switch(mode & ~(OTRUNC|OCEXEC|ORCLOSE)){
case OREAD:
case OEXEC:
flags = Oread; break;
case OWRITE:
flags = Owrite; break;
case ORDWR:
flags = Oread|Owrite; break;
}
if(mode & ORCLOSE)
flags |= Orclose;
return flags;
}
void
showdir(int fd, Dir *s)
{
char a_time[32], m_time[32];
char *p;
strcpy(a_time, ctime(s->atime));
if(p=strchr(a_time, '\n')) /* assign = */
*p = 0;
strcpy(m_time, ctime(s->mtime));
if(p=strchr(m_time, '\n')) /* assign = */
*p = 0;
fprint(fd, "name=\"%s\" qid=(0x%llux,%lud) type=%d dev=%d \
mode=0x%8.8lux=0%luo atime=%s mtime=%s length=%lld uid=\"%s\" gid=\"%s\"...",
s->name, s->qid.path, s->qid.vers, s->type, s->dev,
s->mode, s->mode,
a_time, m_time, s->length, s->uid, s->gid);
}
#define SIZE 1024
void
chat(char *fmt, ...)
{
va_list arg;
if(chatty){
va_start(arg, fmt);
vfprint(2, fmt, arg);
va_end(arg);
}
}
void
panic(int rflag, char *fmt, ...)
{
va_list arg;
char buf[SIZE]; int n;
n = sprint(buf, "%s %d: ", argv0, getpid());
va_start(arg, fmt);
vseprint(buf+n, buf+SIZE, fmt, arg);
va_end(arg);
fprint(2, (rflag ? "%s: %r\n" : "%s\n"), buf);
if(chatty){
fprint(2, "abort\n");
abort();
}
exits("panic");
}