Date: Fri, 7 Jan 2011 13:57:21 +0100 From: joris dedieu <joris.dedieu@gmail.com> To: freebsd-hackers <freebsd-hackers@freebsd.org> Subject: binding non local ip. Message-ID: <AANLkTimJBkTdgs4P=XjHyTCinfCOn0Ku8bEVcR-q=Dzc@mail.gmail.com>
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Hi,
I need a to bind non local ips daemons that don't
implement IP_BINDANY sockopt.
There are several solutions as patching every single daemon
or using carp (You may not want automatic failover), jailing
the process and of course binding INADDR_ANY when possible ...
Has I'm too lazy for this, I wrote a little (maybe ugly as my
kernel knowledges are really low) patch that add a sysctl
entry in net.inet.ip that allow binding non local ips. It's
maybe buggy and insecure but it seems to work.
What do you think about it ?
Thanks
Joris
--- a/sys/netinet/in_pcb.c
+++ b/sys/netinet/in_pcb.c
@@ -321,6 +321,9 @@ in_pcbbind(struct inpcb *inp, struct sockaddr
*nam, struct ucred *cred)
*
* On error, the values of *laddrp and *lportp are not changed.
*/
+static int bindany = 0; /* 1 allows to bind a non local ip */
+SYSCTL_INT(_net_inet_ip, OID_AUTO, bindany, CTLFLAG_RW, &bindany, 0,
+ "Allow to bind a non local ip");
int
in_pcbbind_setup(struct inpcb *inp, struct sockaddr *nam, in_addr_t *laddrp,
u_short *lportp, struct ucred *cred)
@@ -393,8 +396,12 @@ in_pcbbind_setup(struct inpcb *inp, struct
sockaddr *nam, in_addr_t *laddrp,
* to any endpoint address, local or not.
*/
if ((inp->inp_flags & INP_BINDANY) == 0 &&
- ifa_ifwithaddr_check((struct sockaddr *)sin) == 0)
- return (EADDRNOTAVAIL);
+ ifa_ifwithaddr_check((struct sockaddr *)sin) == 0) {
+ if(bindany > 0)
+ inp->inp_flags |= INP_BINDANY;
+ else
+ return (EADDRNOTAVAIL);
+ }
}
laddr = sin->sin_addr;
if (lport) {
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