#define ENDPORT (IPPORT_RESERVED - 1)
#define NPORTS (ENDPORT - STARTPORT + 1)
-#if 0
-/*
- * Bind a socket to a privileged IP port
- */
-int
-bindresvport(sd, sin)
- int sd;
- struct sockaddr_in *sin;
-{
- return bindresvport_af(sd, (struct sockaddr *)sin, AF_INET);
-}
-#endif
-
/*
* Bind a socket to a privileged IP port
*/
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
u_int16_t *portp;
+ u_int16_t port;
int salen;
int i;
}
sa->sa_family = af;
- if (*portp == 0)
- *portp = (getpid() % NPORTS) + STARTPORT;
+ port = ntohs(*portp);
+ if (port == 0)
+ port = (arc4random() % NPORTS) + STARTPORT;
for(i = 0; i < NPORTS; i++) {
+ *portp = htons(port);
+
error = bind(sd, sa, salen);
- if ((error == 0) || ((error < 0) && (errno != EADDRINUSE)))
+ /* Terminate on success */
+ if (error == 0)
+ break;
+
+ /* Terminate on errors, except "address already in use" */
+ if ((error < 0) && !((errno == EADDRINUSE) || (errno == EINVAL)))
break;
- (*portp)++;
- if (*portp < ENDPORT)
- *portp = STARTPORT;
+ port++;
+ if (port > ENDPORT)
+ port = STARTPORT;
}
return (error);