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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0004810||OCaml||OCaml general||public||2009-05-29 11:45||2009-10-18 10:37|
|Target Version||Fixed in Version||3.11.2+dev|
|Summary||0004810: small patch for unix/socketaddr.c|
|Description||Under NetBSD, the Unix.sockaddr function does not work correctly, since the sin_len/sin6_len fields are not set. The attached patch solves the problem for me, and should not hinder on other operating systems.|
|Tags||No tags attached.|
|Attached Files|| patch-ca [^] (788 bytes) 2009-05-29 11:45 [Show Content]
patch-ba [^] (1,449 bytes) 2009-10-17 14:24 [Show Content]
Unfortunately, the patch does hinder very much on other operating systems: for instance, Linux has neither sin_len nor sin6_len fields.
Concerning sin_len, Stevens says that it's not part of POSIX 1g and that it's for kernel internal use -- the kernel should *not* expect the user to set it. If NetBSD thinks otherwise, it's a NetBSD problem.
Concerning sin_len6, there's an #ifdef to be put around assignments to sin6_len.
What happens is that without the patch, something like
let sa = ADDR_INET (inet_addr_of_string some_ip_address, 80) in
getnameinfo sa ;;
always gives a Not_found exception, whereas with the patch, it correctly returns.
The NetBSD implementation of getnameinfo explicitly checks for sockaddr.sa_len not being 0, otherwise it fails. This seems to be a BSDism, though, as you say. Would it help if I put an #ifdef SYS_bsd around it and changed the assignments to sin_len/sin6_len to sa_len?
I agree with you that setting the sa_len field in get_sockaddr() should be enough.
A Web search for "getnameinfo sa_len" reveals the portability nightmare: some systems (BSD and perhaps others) have sa_len and check it in getnameinfo(), and other systems (Linux and perhaps others) do not have sa_len at all. So it's #ifdef time...
I don't think #ifdef SYS_bsd is appropriate: the SYS_xxx Caml macros are not defined when compiling otherlibs/, and other systems beyond BSD may need sa_len to be set. A special "configure" test is probably needed.
Looking at the issue, it appears that a correct fix is to use #ifdef SIN6_LEN to know whether the OS does use BSD 4.3 sockets, or BSD 4.4 sockets.
See RFC 2553, at the top of page 8:
" The only differences between this data structure and the 4.3BSD
variant are the inclusion of the length field, and the change of the
family field to a 8-bit data type. The definitions of all the other
fields are identical to the structure defined in the previous
Systems that provide this version of the sockaddr_in6 data structure
must also declare SIN6_LEN as a result of including the
<netinet/in.h> header. This macro allows applications to determine
whether they are being built on a system that supports the 4.3BSD or
4.4BSD variants of the data structure.
The patch-ba file seems to fix the issue both for netbsd and solaris (which does not have sa_len)
> Looking at the issue, it appears that a correct fix is to use #ifdef SIN6_LEN
> to know whether the OS does use BSD 4.3 sockets, or BSD 4.4 sockets.
> See RFC 2553, at the top of page 8:
Thanks for the suggestion. A Google search suggests to use #ifdef SIN_LEN to check for sin_len, and #ifdef SIN6_LEN to check for sin6_len. (It makes sense.)
Will do this in time for release 3.11.2.
> The patch-ba file seems to fix the issue both for netbsd and solaris
> (which does not have sa_len)
patch-ba changes Makefile but not socketaddr.c.
|2009-05-29 11:45||jaap||New Issue|
|2009-05-29 11:45||jaap||File Added: patch-ca|
|2009-05-31 12:20||xleroy||Note Added: 0004975|
|2009-05-31 12:20||xleroy||Status||new => feedback|
|2009-05-31 15:13||jaap||Note Added: 0004976|
|2009-05-31 16:09||xleroy||Note Added: 0004977|
|2009-05-31 16:09||xleroy||Assigned To||=> xleroy|
|2009-05-31 16:09||xleroy||Status||feedback => acknowledged|
|2009-10-17 14:24||areilles||File Added: patch-ba|
|2009-10-17 14:30||areilles||Note Added: 0005135|
|2009-10-18 10:37||xleroy||Note Added: 0005136|
|2009-10-18 10:37||xleroy||Status||acknowledged => closed|
|2009-10-18 10:37||xleroy||Resolution||open => fixed|
|2009-10-18 10:37||xleroy||Fixed in Version||=> 3.11.2+dev|
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