Hi,
I am still unable to find an exact solution for this. Below are the suggestions
that I got from James. My requirement is to open two IPv6 sockets and bind
wildcard addresses to a fixed port.
/*****************************************************************************/
I tried the TCP_EXCLBIND option but still i am unable to open and bind two
sockets with the same IP:Port. Below is my program
#include<stdio.h>
#include<sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include<sys/types.h>
int main(){
struct sockaddr_in6 sa;
struct sockaddr_in6 sa1;
int a,b,optval=1;
int family=AF_INET6;
memset(&sa,0,sizeof(struct sockaddr_in6));
memset(&sa1,0,sizeof(struct sockaddr_in6));
sa.sin6_port=htons(11304);
sa1.sin6_port=htons(11304);
sa.sin6_family=sa1.sin6_family=family;
a=socket(AF_INET6,SOCK_STREAM,0);
b=socket(AF_INET6,SOCK_STREAM,0);
printf("Opened socket 1 = %d\n",a);
printf("Opened socket 2 = %d\n",b);
if((setsockopt(a,SOL_SOCKET,SO_REUSEADDR,&optval,sizeof(optval)))==-1)
perror("Setsockopt failed :");
else printf("optval = %d\n",optval);
if((setsockopt(b,SOL_SOCKET,SO_REUSEADDR,&optval,sizeof(optval)))==-1)
perror("Setsockopt failed :");
else printf("optval = %d\n",optval);
if((setsockopt(a,IPPROTO_TCP,TCP_EXCLBIND,&optval,sizeof(optval)))==-1)
perror("Setsockopt failed :");
else printf("optval = %d\n",optval);
if((setsockopt(b,IPPROTO_TCP,TCP_EXCLBIND,&optval,sizeof(optval)))==-1)
perror("Setsockopt failed :");
else printf("optval = %d\n",optval);
if(bind(a,(struct sockaddr *)&sa,sizeof(struct sockaddr_in6))==-1)
perror("Bind 1 failed :");
else
printf("Bind 1 success\n");
if(bind(b,(struct sockaddr *)&sa1,sizeof(struct sockaddr_in6))==-1)
perror("Bind 2 failed :");
else
printf("Bind 2 success\n");
printf("Done everything\n");
close(a);
close(b);
return 0;
}
I also found an option SO_EXCLBIND in sun docs, but this is not defined in any
of the headers. I am working on Solaris 10.
/*******************************************************************************************/
Manish Katiyar writes:
> I tried the TCP_EXCLBIND option but still i am unable to open and bind two
> sockets with the same IP:Port. Below is my program
If you set TCP_EXCLBIND, then you can't bind two sockets to the same
port. Solaris doesn't have the concept of a port "user" who is
exempted from the port-binding rules.
Why do you need to do that?
> I also found an option SO_EXCLBIND in sun docs, but this is not defined in
> any of the headers. I am working on Solaris 10.
sys/socket.h has SO_EXCLBIND, but you'll only find it in Nevada, not
S10. It was added by CR 6445396.
/********************************************************************************************/
Thanks James for the reply,
I am seeing the docs from below url
http://docs.sun.com/app/docs/doc/819-2244/6n4i17pdo?l=zh_TW&a=view
We have a RPC application which we are porting for IPv6. Initially when we had
only IPv4 we could use a wildcard address and a fixed port and add to our list
of open descriptors along with some other info. So now we need to open these
descriptors twice , once for IPv4 and IPv6. Since IPv6 sockets are able to
handle IPv4 too we open V4 sockets too with family AF_INET6 and add it to list.
But once we have opened for IPv4 it is not allowing to bind the fixed port to
wildcard addresses for IPv6. For other platforms we used SO_REUSEPORT option to
achieve this and thus want to implement the same in Solaris.
We need to open it twice since while adding to the list we store a lot more
stuff which is specific to that protocol.
Hope I am clear.
Thanks again.
******************************************************************************************
Manish Katiyar writes:
> We have a RPC application which we are porting for IPv6. Initially when we
> had only IPv4 we could use a wildcard address and a fixed port and add to
> our list of open descriptors along with some other info. So now we need to
> open these descriptors twice , once for IPv4 and IPv6. Since IPv6 sockets
> are able to handle IPv4 too we open V4 sockets too with family AF_INET6 and
> add it to list.
Use IPV6_V6ONLY.
/*********************************************************************************/
Using this option would mean that I will not be able to accept IPv4 mapped
addresses on IPv6 sockets, and that would break our existing functionality on
other platforms.
Currently for other platforms we accept input of following form from client
side.
1) ./client ncacn_ip_tcp:9.182.192.169 (Internally we treat this as mapped
address since socket is opened on AF_INET6)
2) ./client ncacn_ipv6_tcp:::ffff: 9.182.192.169
3) ./client ncacn_ipv6_tcp:fe80::209:6bff:feeb:70b3
Thus you can see we support all kind of addresses,( even though mapped
addresses have some security risk, but we are not so much concerned about it).
That is why i need to bind wildcard address to same port twice, one for
ncacn_ip_tcp string and other for ncacn_ipv6_tcp string. because this is the
way our server daemon listens on all other platforms.
so basically i am looking for some way by which i can simulate the behaviour of
SO_REUSEPORT on solaris.
any suggestions??
Thanks a lot for your inputs
/*******************************************************************************************/
Manish Katiyar writes:
> Using this option would mean that I will not be able to accept IPv4 mapped
> addresses on IPv6 sockets, and that would break our existing functionality
> on other platforms.
I don't think you want to use IPv4-mapped addresses; the IPv6 folks
have not tried hard to make those interfaces work well at all.
They're intended as a minimally-functional migration mechanism,
nothing more.
We've discussed some of the issues involved with IPv4-mapped addresses
before,
Using that option would (as far as I know) make your application work
right on both Solaris and other platforms, minus the mapped address
issue.
> Thus you can see we support all kind of addresses,( even though mapped
> addresses have some security risk, but we are not so much concerned about
> it). That is why i need to bind wildcard address to same port twice, one for
> ncacn_ip_tcp string and other for ncacn_ipv6_tcp string. because this is the
> way our server daemon listens on all other platforms.
The issue you're having isn't just with SO_REUSEPORT. It is:
- Solaris IPv6 has only minimal support for IPv4-mapped, but you
observe that it (apparently) works well on other platforms. How
can anyone write portable applications if Solaris doesn't have
equivalent support?
- Solaris doesn't respect the current-UID mechanism that BSD has for
determining port conflicts, so rebinding hurts.
> so basically i am looking for some way by which i can simulate the behaviour
> of SO_REUSEPORT on solaris.
>
> any suggestions??
I would bind two separate sockets: one open on IPv4, and the other on
IPv6 with the IPV6_V6ONLY option set.
/**************************************************************************************/
This message posted from opensolaris.org
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