Date: Tue, 26 Nov 2002 23:47:39 +0900 From: Jacques Garrigue <garrigue@kurims.kyoto-u.ac.jp> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/45753: linux-sun-jdk1.4.1 calls SIOCGIFCONF ioctl with null buffer Message-ID: <20021126234739H.garrigue@kurims.kyoto-u.ac.jp>
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>Number: 45753
>Category: kern
>Synopsis: linux-sun-jdk1.4.1 calls SIOCGIFCONF ioctl with null buffer
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Nov 26 06:50:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Jacques Garrigue
>Release: FreeBSD 5.0-DP2 i386
>Organization:
Kyoto University RIMS
>Environment:
System: FreeBSD tet.kurims.kyoto-u.ac.jp 5.0-DP2 FreeBSD 5.0-DP2 #2: Wed Nov 20 08:52:26 JST 2002 garrigue@tet.kurims.kyoto-u.ac.jp:/usr/src/sys/i386/compile/TET i386
>Description:
Sun's linux jdk1.4.1 implements java.net.NetworkInterface.getNetworkInterfaces
by first calling SIOCGIFCONF with a NULL buffer, expecting the buffer size as
result.
This call pattern was not implemented /sys/compat/linux/linux_ioctl.c.
The following patch appears to solve the problem.
>How-To-Repeat:
Calling java.net.NetworkInterface.getNetworkInterfaces() returns null.
>Fix:
Apply the following patch
--- linux_ioctl.c.diffs begins here ---
*** linux_ioctl.c.orig Sat Nov 16 18:07:31 2002
--- linux_ioctl.c Tue Nov 26 18:24:46 2002
***************
*** 1978,1983 ****
--- 1978,1997 ----
if (error != 0)
return (error);
+ /* special case used by JDK: uifc.ifc_buf is NULL */
+ if (ifc.ifc_buf == 0) {
+ ifc.ifc_len = 0;
+ TAILQ_FOREACH(ifp, &ifnet, if_link) {
+ TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+ struct sockaddr *sa = ifa->ifa_addr;
+ if (sa->sa_family == AF_INET)
+ ifc.ifc_len += sizeof ifr;
+ }
+ }
+ error = copyout(&ifc, uifc, sizeof ifc);
+ return (error);
+ }
+
/* much easier to use uiomove than keep track ourselves */
iov.iov_base = ifc.ifc_buf;
iov.iov_len = ifc.ifc_len;
--- linux_ioctl.c.diffs ends here ---
>Release-Note:
>Audit-Trail:
>Unformatted:
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