quoted text > Le mercredi 21 avril 2010 à 12:25 +0400, Evgeniy Polyakov a écrit :
>
> > I believe this is a useful patch, but it addresses a different issue.
> > This path should not fire up when we bind to single address.
>
> Well, the real problem is that following sequence can happen :
>
> socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 5
> setsockopt(5, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
> bind(5, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("127.0.0.2")}, 16) = 0
> getsockname(5, {sa_family=AF_INET, sin_port=htons(34000), sin_addr=inet_addr("127.0.0.2")}, [16]) = 0
> socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 6
> setsockopt(6, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
> bind(6, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("127.0.0.2")}, 16) = 0
> getsockname(6, {sa_family=AF_INET, sin_port=htons(34002), sin_addr=inet_addr("127.0.0.2")}, [16]) = 0
> socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 7
> setsockopt(7, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
> bind(7, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("127.0.0.2")}, 16) = 0
> getsockname(7, {sa_family=AF_INET, sin_port=htons(34001), sin_addr=inet_addr("127.0.0.2")}, [16]) = 0
> socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 8
> setsockopt(8, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
> bind(8, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("127.0.0.2")}, 16) = 0
> getsockname(8, {sa_family=AF_INET, sin_port=htons(34002), sin_addr=inet_addr("127.0.0.2")}, [16]) = 0
> socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 9
> setsockopt(9, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
> bind(9, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("127.0.0.2")}, 16) = 0
> getsockname(9, {sa_family=AF_INET, sin_port=htons(34000), sin_addr=inet_addr("127.0.0.2")}, [16]) = 0
> socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 10
> setsockopt(10, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
> bind(10, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("127.0.0.2")}, 16) = 0
> getsockname(10, {sa_family=AF_INET, sin_port=htons(34002), sin_addr=inet_addr("127.0.0.2")}, [16]) = 0
> socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 11
> setsockopt(11, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
> bind(11, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("127.0.0.2")}, 16) = 0
> getsockname(11, {sa_family=AF_INET, sin_port=htons(34001), sin_addr=inet_addr("127.0.0.2")}, [16]) = 0
>
>
> Note ports are given several times for different sockets.
>
> So several sockets are 'bound' to same IP:port values
That's kind of weird, since address is the same. I'm curious why bind
conflict does not resolve that. Likely because socket is not yet
connected.
Yup. But isn't it a different problem from what Gaspar observed?
Netcat connects after bind so it should not be an issue here.
--
Evgeniy Polyakov
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