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Use the more robust and more efficient reserved port allocation mechanism

Browse source 
now built into bind(2).

Obtained from: OpenBSD / Jason Downs / Theo de Raadt
This commit is contained in:
Peter Wemm 1996-08-12 14:09:46 +00:00
parent bbd42ad0e5
commit cf2fcd35dd
1 changed files with 45 additions and 21 deletions
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66
lib/libc/rpc/bindresvport.c
View file

@ -30,11 +30,14 @@
#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)bindresvport.c 1.8 88/02/08 SMI";*/
/*static char *sccsid = "from: @(#)bindresvport.c 2.2 88/07/29 4.0 RPCSRC";*/
static char *rcsid = "$Id: bindresvport.c,v 1.3 1995/10/22 14:51:11 phk Exp $";
/*from: OpenBSD: bindresvport.c,v 1.7 1996/07/30 16:25:47 downsj Exp */
static char *rcsid = "$Id: bindresvport.c,v 1.4 1996/06/10 00:49:15 jraynard Exp $";
#endif
/*
* Copyright (c) 1987 by Sun Microsystems, Inc.
*
* Portions Copyright(C) 1996, Jason Downs. All rights reserved.
*/
#include <sys/types.h>
@ -47,39 +50,60 @@ static char *rcsid = "$Id: bindresvport.c,v 1.3 1995/10/22 14:51:11 phk Exp $";
/*
* Bind a socket to a privileged IP port
*/
int bindresvport(sd, sin)
int
bindresvport(sd, sin)
int sd;
struct sockaddr_in *sin;
{
int res;
static short port;
int on, old, error;
struct sockaddr_in myaddr;
int i;
#define STARTPORT 600
#define ENDPORT (IPPORT_RESERVED - 1)
#define NPORTS (ENDPORT - STARTPORT + 1)
int sinlen = sizeof(struct sockaddr_in);
if (sin == (struct sockaddr_in *)0) {
sin = &myaddr;
bzero(sin, sizeof (*sin));
memset(sin, 0, sizeof(*sin));
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
} else if (sin->sin_family != AF_INET) {
errno = EPFNOSUPPORT;
return (-1);
}
if (port == 0) {
port = (getpid() % NPORTS) + STARTPORT;
if (sin->sin_port == 0) {
int oldlen = sizeof(old);
error = getsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
&old, &oldlen);
if (error < 0)
return(error);
on = IP_PORTRANGE_LOW;
error = setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
&on, sizeof(on));
if (error < 0)
return(error);
}
res = -1;
errno = EADDRINUSE;
for (i = 0; i < NPORTS && res < 0 && errno == EADDRINUSE; i++) {
sin->sin_port = htons(port++);
if (port > ENDPORT) {
port = STARTPORT;
error = bind(sd, (struct sockaddr *)sin, sizeof(*sin));
if (sin->sin_port == 0) {
int saved_errno = errno;
if (error) {
if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
&old, sizeof(old)) < 0)
errno = saved_errno;
return (error);
}
if (sin != &myaddr) {
int sinlen = sizeof(*sin);
/* Hmm, what did the kernel assign... */
if (getsockname(sd, (struct sockaddr *)sin,
&sinlen) < 0)
errno = saved_errno;
return (error);
}
res = bind(sd,
(struct sockaddr *)sin, sizeof(struct sockaddr_in));
}
return (res);
return (error);
}