int
nbdgramsendto(uint8_t *ipaddr, uint16_t port, NbDgram *s)
{
Udphdr *u;
uint8_t msg[NbDgramMaxPacket + Udphdrsize];
int l;
int rv;
char *e;
e = startlistener();
if (e != nil)
return 0;
l = nbdgramconvS2M(msg + nbudphdrsize, msg + sizeof(msg), s);
if (l == 0) {
print("conv failed\n");
return 0;
}
u = (Udphdr *)msg;
ipmove(u->laddr, nbglobals.myipaddr);
hnputs(u->lport, NbDgramPort);
ipmove(u->raddr, ipaddr);
hnputs(u->rport, port);
//nbdumpdata(msg, l + nbudphdrsize);
//print("transmitting\n");
rv = write(udp.fd, msg, l + nbudphdrsize);
//print("rv %d l %d hdrsize %d error %r\n", rv, l, nbudphdrsize);
return rv == l + nbudphdrsize;
}
char *
nbdgramlisten(NbName to, int (*deliver)(void *magic, NbDgram *s), void *magic)
{
Listen *l;
char *e;
nbnametablefind(to, 1);
e = startlistener();
if (e)
return e;
l = nbemalloc(sizeof(Listen));
nbnamecpy(l->to, to);
l->deliver = deliver;
l->magic = magic;
qlock(&listens);
l->next = listens.head;
listens.head = l;
qunlock(&listens);
return 0;
}
NbnsTransaction *
nbnstransactionnew(NbnsMessage *s, uchar *ipaddr)
{
NbnsTransaction *t;
uchar msg[Udphdrsize + 576];
Udphdr *u;
int len;
startlistener();
len = nbnsconvS2M(s, msg + nbudphdrsize, sizeof(msg) - nbudphdrsize);
if (len == 0)
return 0;
t = mallocz(sizeof(*t), 1);
if (t == nil)
return nil;
t->id = s->id;
t->c = chancreate(sizeof(NbnsMessage *), 3);
if (t->c == nil) {
free(t);
return nil;
}
qlock(&transactionlist);
t->next = transactionlist.head;
transactionlist.head = t;
qunlock(&transactionlist);
u = (Udphdr *)msg;
ipmove(u->laddr, nbglobals.myipaddr);
hnputs(u->lport, NbnsPort);
if (s->broadcast || ipaddr == nil)
ipmove(u->raddr, nbglobals.bcastaddr);
else
ipmove(u->raddr, ipaddr);
hnputs(u->rport, NbnsPort);
write(udp.fd, msg, len + nbudphdrsize);
return t;
}
