i believe the calls to listen an accept were
missing. i added a function to the client to
determine the local address so we don't have to
depend on localhost. (which is never set on my
machines.) and i added a function to the server to
print the caller.
- erik
ps. would some humane soul please take localhost
out back and shoot it.
#include <u.h>
#include <libc.h>
#include <ip.h>
int
findip(char *s, int len)
{
Ipifc *ifc;
Iplifc *l;
fmtinstall('I', eipfmt);
for(ifc = readipifc("/net", 0, 0); ifc; ifc = ifc->next)
for(l = ifc->lifc; l; l = l->next)
if(l->ip){
// freeipifc(ifc);
snprint(s, len, "udp!%I!8001", l->ip);
return 0;
}
// freeipifc(ifc);
return -1;
}
void
main(void)
{
char buf[128], ds[64];
int n, fd, len;
if(findip(ds, sizeof ds) == -1)
sysfatal("can't find my ip");
if((fd = dial(ds, 0, 0, 0)) == -1)
sysfatal("dial: %r");
srand(time(0));
len = sprint(buf, "Message to server%d", rand());
if(write(fd, buf, len) != len)
sysfatal("write: %r");
if((n = read(fd, buf, sizeof buf)) == -1)
sysfatal("read: %r");
fprint(2, "read [%.*s]\n", n, buf);
close(fd);
exits("");
}#include <u.h>
#include <libc.h>
#include <ip.h>
char*
remoteaddr(char *dir)
{
static char buf[128];
char *p;
int n, fd;
snprint(buf, sizeof buf, "%s/remote", dir);
fd = open(buf, OREAD);
if(fd < 0)
return "";
n = read(fd, buf, sizeof(buf));
close(fd);
if(n > 0){
buf[n] = 0;
p = strchr(buf, '!');
if(p)
*p = 0;
return buf;
}
return "";
}
void
main(void)
{
char buf[512], dir[40], ndir[40];
int n, ctl, nctl, fd;
if((ctl = announce("udp!*!8001", dir)) == -1)
sysfatal("announce: %r");
nctl = listen(dir, ndir);
if(nctl < 0)
sysfatal("listen %r");
fd = accept(nctl, ndir);
if(fd < 0)
sysfatal("accept: can't open %s/data: %r", ndir);
fprint(2, "incoming call from %s in %s\n", remoteaddr(ndir), ndir);
if((n = read(fd, buf, sizeof buf)) == -1)
sysfatal("read: %r");
fprint(2, "read [%.*s]\n", n, buf);
if(write(fd, buf, n) != n)
sysfatal("read: %r");
close(ctl);
close(nctl);
exits(0);
}
