static void
tcpreader(void *a)
{
Session *s = a;
uint8_t *buf;
int buflen = smbglobals.maxreceive + 4;
buf = nbemalloc(buflen);
for (;;) {
int n;
uint8_t flags;
uint16_t length;
n = readn(s->fd, buf, 4);
if (n != 4) {
die:
free(buf);
if (s->state == Connected)
(*s->write)(s, nil, -1);
deletesession(s);
return;
}
flags = buf[1];
length = nhgets(buf + 2) | ((flags & 1) << 16);
if (length > buflen - 4) {
print("nbss: too much data (%ud)\n", length);
goto die;
}
n = readn(s->fd, buf + 4, length);
if (n != length)
goto die;
if (s->state == Connected) {
if ((*s->write)(s, buf + 4, length) != 0) {
s->state = Dead;
goto die;
}
}
}
}
static void
tcpreader(void *a)
{
Session *s = a;
uchar *buf;
int buflen = 0x1ffff + 4;
buf = nbemalloc(buflen);
for (;;) {
int n;
uchar flags;
ushort length;
n = readn(s->fd, buf, 4);
if (n != 4) {
die:
free(buf);
if (s->state == Connected)
(*s->write)(s, nil, -1);
deletesession(s);
return;
}
flags = buf[1];
length = nhgets(buf + 2) | ((flags & 1) << 16);
n = readn(s->fd, buf + 4, length);
if (n != length)
goto die;
if (flags & 0xfe) {
print("nbss: invalid flags field 0x%.2ux\n", flags);
goto die;
}
switch (buf[0]) {
case 0: /* session message */
if (s->state != Connected && s->state != Dead) {
print("nbss: unexpected session message\n");
goto die;
}
if (s->state == Connected) {
if ((*s->write)(s, buf + 4, length) != 0) {
s->state = Dead;
goto die;
}
}
break;
case 0x81: /* session request */ {
uchar *p, *ep;
Listen *l;
int k;
int called_found;
uchar error_code;
if (s->state == Connected) {
print("nbss: unexpected session request\n");
goto die;
}
p = buf + 4;
ep = p + length;
k = nbnamedecode(p, p, ep, s->to);
if (k == 0) {
print("nbss: malformed called name in session request\n");
goto die;
}
p += k;
k = nbnamedecode(p, p, ep, s->from);
if (k == 0) {
print("nbss: malformed calling name in session request\n");
goto die;
}
/*
p += k;
if (p != ep) {
print("nbss: extra data at end of session request\n");
goto die;
}
*/
called_found = 0;
//print("nbss: called %B calling %B\n", s->to, s->from);
qlock(&listens);
for (l = listens.head; l; l = l->next)
if (nbnameequal(l->to, s->to)) {
called_found = 1;
if (nbnameequal(l->from, s->from))
break;
}
if (l == nil) {
qunlock(&listens);
error_code = called_found ? 0x81 : 0x80;
replydie:
buf[0] = 0x83;
buf[1] = 0;
hnputs(buf + 2, 1);
buf[4] = error_code;
write(s->fd, buf, 5);
goto die;
}
if (!(*l->accept)(l->magic, s, &s->write)) {
qunlock(&listens);
error_code = 0x83;
goto replydie;
}
buf[0] = 0x82;
buf[1] = 0;
hnputs(buf + 2, 0);
if (write(s->fd, buf, 4) != 4) {
qunlock(&listens);
goto die;
}
s->state = Connected;
qunlock(&listens);
break;
}
case 0x85: /* keep awake */
break;
default:
print("nbss: opcode 0x%.2ux unexpected\n", buf[0]);
goto die;
}
}
}
void
nbssfree(NbSession *s)
{
deletesession((Session *)s);
}
