/*
* Reconstruct original message, for error diagnostic
*/
void cmderror(struct cmdbuf *cb, char *s)
{
int i;
char *p, *e;
p = get_cur_genbuf();
e = p + GENBUF_SZ - 10;
p = seprintf(p, e, "%s \"", s);
for (i = 0; i < cb->nf; i++) {
if (i > 0)
p = seprintf(p, e, " ");
p = seprintf(p, e, "%s", cb->f[i]);
}
seprintf(p, e, "\"");
error(EFAIL, get_cur_genbuf());
}
/*
* generate a 3 level directory
*/
static int
netifgen(struct chan *c, char *unused_char_p_t, struct dirtab *vp,
int unused_int, int i, struct dir *dp)
{
struct qid q;
struct ether *nif = (struct ether *)vp;
struct netfile *f;
int perm;
char *o;
q.type = QTFILE;
q.vers = 0;
/* top level directory contains the name of the network */
if (c->qid.path == 0) {
switch (i) {
case DEVDOTDOT:
q.path = 0;
q.type = QTDIR;
devdir(c, q, ".", 0, eve, 0555, dp);
break;
case 0:
q.path = N2ndqid;
q.type = QTDIR;
strncpy(get_cur_genbuf(), nif->name, GENBUF_SZ);
devdir(c, q, get_cur_genbuf(), 0, eve, 0555, dp);
break;
default:
return -1;
}
return 1;
}
/* second level contains clone plus all the conversations.
*
* This ancient comment is from plan9. Inferno and nxm both had issues
* here. You couldn't ls /net/ether0/ when it didn't have any convs. There
* were also issues with nxm where you couldn't stat ether0/x/stats
* properly.
*
* The issue is that if we handle things like Nstatqid, then we will never
* pass it down to the third level. And since we just set the path ==
* Nstatqid, we won't have the NETID muxed in. If someone isn't trying to
* generate a chan, but instead is looking it up (devwalk generates, devstat
* already has the chan), then they are also looking for a devdir with path
* containing ID << 5. So if you stat ether0/1/ifstats, devstat is looking
* for path 41, but we return path 9 (41 = 32 + 9). (these numbers are
* before we tracked NETID + 1).
*
* We (akaros and plan9) had a big if here, that would catch things that do
* not exist in the subdirs of a netif. Things like clone make sense here.
* I guess addr too, though that seems to be added since the original
* comment. You can see what the 3rd level was expecting to parse by looking
* farther down in the code.
*
* The root of the problem was that the old code couldn't tell the
* difference between no netid and netid 0. Now, we determine if we're at
* the second level by the lack of a netid, instead of trying to enumerate
* the qid types that the second level could have. The latter approach
* allowed for something like ether0/1/stats, but we couldn't actually
* devstat ether0/stats directly. It's worth noting that there is no
* difference to the content of ether0/stats and ether0/x/stats (when you
* read), but they have different chan qids.
*
* Here's the old if block:
t = NETTYPE(c->qid.path);
if (t == N2ndqid || t == Ncloneqid || t == Naddrqid) {
*/
if (NETID(c->qid.path) == -1) {
switch (i) {
case DEVDOTDOT:
q.type = QTDIR;
q.path = 0;
devdir(c, q, ".", 0, eve, DMDIR | 0555, dp);
break;
case 0:
q.path = Ncloneqid;
devdir(c, q, "clone", 0, eve, 0666, dp);
break;
case 1:
q.path = Naddrqid;
devdir(c, q, "addr", 0, eve, 0666, dp);
break;
case 2:
q.path = Nstatqid;
devdir(c, q, "stats", 0, eve, 0444, dp);
break;
case 3:
q.path = Nifstatqid;
devdir(c, q, "ifstats", 0, eve, 0444, dp);
break;
default:
i -= 4;
if (i >= nif->nfile)
return -1;
if (nif->f[i] == 0)
return 0;
q.type = QTDIR;
q.path = NETQID(i, N3rdqid);
snprintf(get_cur_genbuf(), GENBUF_SZ, "%d", i);
devdir(c, q, get_cur_genbuf(), 0, eve, DMDIR | 0555, dp);
break;
}
return 1;
}
/* third level */
f = nif->f[NETID(c->qid.path)];
if (f == 0)
return 0;
if (*f->owner) {
o = f->owner;
perm = f->mode;
} else {
o = eve;
perm = 0666;
}
switch (i) {
case DEVDOTDOT:
q.type = QTDIR;
q.path = N2ndqid;
strncpy(get_cur_genbuf(), nif->name, GENBUF_SZ);
devdir(c, q, get_cur_genbuf(), 0, eve, DMDIR | 0555, dp);
break;
case 0:
q.path = NETQID(NETID(c->qid.path), Ndataqid);
devdir(c, q, "data", 0, o, perm, dp);
break;
case 1:
q.path = NETQID(NETID(c->qid.path), Nctlqid);
devdir(c, q, "ctl", 0, o, perm, dp);
break;
case 2:
q.path = NETQID(NETID(c->qid.path), Nstatqid);
devdir(c, q, "stats", 0, eve, 0444, dp);
break;
case 3:
q.path = NETQID(NETID(c->qid.path), Ntypeqid);
devdir(c, q, "type", 0, eve, 0444, dp);
break;
case 4:
q.path = NETQID(NETID(c->qid.path), Nifstatqid);
devdir(c, q, "ifstats", 0, eve, 0444, dp);
break;
default:
return -1;
}
return 1;
}
