/recipes/glibc/glibc-2.5/glibc-check_pf.patch

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Date: Tue, 31 Oct 2006 12:37:08 -0500
From: Daniel Jacobowitz <drow at false dot org>
To: Mike Frysinger <vapier at gentoo dot org>
Cc: libc-ports at sourceware dot org, Philip Balister <philip dot balister at gmail dot com>
Subject: Re: Problem with glibc-2.5 on ARM
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References: <499146270610241149ibe030e0nd9d6b177a95b346e@mail.gmail.com> <499146270610241254u7cadf63ej2edf05cedbc5266f@mail.gmail.com> <20061024195837.GA20181@nevyn.them.org> <200610291954.27022.vapier@gentoo.org>
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On Sun, Oct 29, 2006 at 07:54:25PM -0500, Mike Frysinger wrote:
> On Tuesday 24 October 2006 15:58, Daniel Jacobowitz wrote:
> > ARM is going to need a slightly different version of that file, I
> > guess.
> 
> would declaring req with attribute packed not help ?
> -mike

Nope.  "struct rtgenmsg" would still have size 4.

Philip, are you still at all interested in this for the old ABI?
I don't have time to test this patch right now, but I think it
will work.

-- 
Daniel Jacobowitz
CodeSourcery

2006-10-31  Daniel Jacobowitz  <dan@codesourcery.com>

	* sysdeps/unix/sysv/linux/arm/check_pf.c: New file.
	* sysdeps/unix/sysv/linux/arm/eabi/check_pf.c: New file.

Index: sysdeps/unix/sysv/linux/arm/check_pf.c
===================================================================
RCS file: sysdeps/unix/sysv/linux/arm/check_pf.c
diff -N sysdeps/unix/sysv/linux/arm/check_pf.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ sysdeps/unix/sysv/linux/arm/check_pf.c	31 Oct 2006 17:29:58 -0000
@@ -0,0 +1,274 @@
+/* Determine protocol families for which interfaces exist.  ARM Linux version.
+   Copyright (C) 2003, 2006 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <assert.h>
+#include <errno.h>
+#include <ifaddrs.h>
+#include <netdb.h>
+#include <stddef.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/socket.h>
+
+#include <asm/types.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+
+#include <not-cancel.h>
+#include <kernel-features.h>
+
+
+#ifndef IFA_F_TEMPORARY
+# define IFA_F_TEMPORARY IFA_F_SECONDARY
+#endif
+#ifndef IFA_F_HOMEADDRESS
+# define IFA_F_HOMEADDRESS 0
+#endif
+
+
+static int
+make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6,
+	      struct in6addrinfo **in6ai, size_t *in6ailen)
+{
+  struct req
+  {
+    struct nlmsghdr nlh;
+    struct rtgenmsg g;
+  } req;
+  struct sockaddr_nl nladdr;
+
+  /* struct rtgenmsg consists of a single byte but the ARM ABI rounds
+     it up to a word.  Clear the padding explicitly here.  */
+  assert (sizeof (req.g) == 4);
+  memset (&req.g, '\0', sizeof (req.g));
+
+  req.nlh.nlmsg_len = sizeof (req);
+  req.nlh.nlmsg_type = RTM_GETADDR;
+  req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
+  req.nlh.nlmsg_pid = 0;
+  req.nlh.nlmsg_seq = time (NULL);
+  req.g.rtgen_family = AF_UNSPEC;
+
+  memset (&nladdr, '\0', sizeof (nladdr));
+  nladdr.nl_family = AF_NETLINK;
+
+  if (TEMP_FAILURE_RETRY (__sendto (fd, (void *) &req, sizeof (req), 0,
+				    (struct sockaddr *) &nladdr,
+				    sizeof (nladdr))) < 0)
+    return -1;
+
+  *seen_ipv4 = false;
+  *seen_ipv6 = false;
+
+  bool done = false;
+  char buf[4096];
+  struct iovec iov = { buf, sizeof (buf) };
+  struct in6ailist
+  {
+    struct in6addrinfo info;
+    struct in6ailist *next;
+  } *in6ailist = NULL;
+  size_t in6ailistlen = 0;
+
+  do
+    {
+      struct msghdr msg =
+	{
+	  (void *) &nladdr, sizeof (nladdr),
+	  &iov, 1,
+	  NULL, 0,
+	  0
+	};
+
+      ssize_t read_len = TEMP_FAILURE_RETRY (__recvmsg (fd, &msg, 0));
+      if (read_len < 0)
+	return -1;
+
+      if (msg.msg_flags & MSG_TRUNC)
+	return -1;
+
+      struct nlmsghdr *nlmh;
+      for (nlmh = (struct nlmsghdr *) buf;
+	   NLMSG_OK (nlmh, (size_t) read_len);
+	   nlmh = (struct nlmsghdr *) NLMSG_NEXT (nlmh, read_len))
+	{
+	  if (nladdr.nl_pid != 0 || (pid_t) nlmh->nlmsg_pid != pid
+	      || nlmh->nlmsg_seq != req.nlh.nlmsg_seq)
+	    continue;
+
+	  if (nlmh->nlmsg_type == RTM_NEWADDR)
+	    {
+	      struct ifaddrmsg *ifam = (struct ifaddrmsg *) NLMSG_DATA (nlmh);
+
+	      switch (ifam->ifa_family)
+		{
+		case AF_INET:
+		  *seen_ipv4 = true;
+		  break;
+		case AF_INET6:
+		  *seen_ipv6 = true;
+
+		  if (ifam->ifa_flags & (IFA_F_DEPRECATED
+					 | IFA_F_TEMPORARY
+					 | IFA_F_HOMEADDRESS))
+		    {
+		      struct rtattr *rta = IFA_RTA (ifam);
+		      size_t len = (nlmh->nlmsg_len
+				    - NLMSG_LENGTH (sizeof (*ifam)));
+		      void *local = NULL;
+		      void *address = NULL;
+		      while (RTA_OK (rta, len))
+			{
+			  switch (rta->rta_type)
+			    {
+			    case IFA_LOCAL:
+			      local = RTA_DATA (rta);
+			      break;
+
+			    case IFA_ADDRESS:
+			      address = RTA_DATA (rta);
+			      break;
+			    }
+
+			  rta = RTA_NEXT (rta, len);
+			}
+
+		      struct in6ailist *newp = alloca (sizeof (*newp));
+		      newp->info.flags = (((ifam->ifa_flags & IFA_F_DEPRECATED)
+					   ? in6ai_deprecated : 0)
+					  | ((ifam->ifa_flags
+					      & IFA_F_TEMPORARY)
+					     ? in6ai_temporary : 0)
+					  | ((ifam->ifa_flags
+					      & IFA_F_HOMEADDRESS)
+					     ? in6ai_homeaddress : 0));
+		      memcpy (newp->info.addr, address ?: local,
+			      sizeof (newp->info.addr));
+		      newp->next = in6ailist;
+		      in6ailist = newp;
+		      ++in6ailistlen;
+		    }
+		  break;
+		default:
+		  /* Ignore.  */
+		  break;
+		}
+	    }
+	  else if (nlmh->nlmsg_type == NLMSG_DONE)
+	    /* We found the end, leave the loop.  */
+	    done = true;
+	}
+    }
+  while (! done);
+
+  close_not_cancel_no_status (fd);
+
+  if (in6ailist != NULL)
+    {
+      *in6ai = malloc (in6ailistlen * sizeof (**in6ai));
+      if (*in6ai == NULL)
+	return -1;
+
+      *in6ailen = in6ailistlen;
+
+      do
+	{
+	  (*in6ai)[--in6ailistlen] = in6ailist->info;
+	  in6ailist = in6ailist->next;
+	}
+      while (in6ailist != NULL);
+    }
+
+  return 0;
+}
+
+
+/* We don't know if we have NETLINK support compiled in in our
+   Kernel.  */
+#if __ASSUME_NETLINK_SUPPORT == 0
+/* Define in ifaddrs.h.  */
+extern int __no_netlink_support attribute_hidden;
+#else
+# define __no_netlink_support 0
+#endif
+
+
+void
+attribute_hidden
+__check_pf (bool *seen_ipv4, bool *seen_ipv6,
+	    struct in6addrinfo **in6ai, size_t *in6ailen)
+{
+  *in6ai = NULL;
+  *in6ailen = 0;
+
+  if (! __no_netlink_support)
+    {
+      int fd = __socket (PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+
+      struct sockaddr_nl nladdr;
+      memset (&nladdr, '\0', sizeof (nladdr));
+      nladdr.nl_family = AF_NETLINK;
+
+      socklen_t addr_len = sizeof (nladdr);
+
+      if (fd >= 0
+	  && __bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) == 0
+	  && __getsockname (fd, (struct sockaddr *) &nladdr, &addr_len) == 0
+	  && make_request (fd, nladdr.nl_pid, seen_ipv4, seen_ipv6,
+			   in6ai, in6ailen) == 0)
+	/* It worked.  */
+	return;
+
+      if (fd >= 0)
+	__close (fd);
+
+#if __ASSUME_NETLINK_SUPPORT == 0
+      /* Remember that there is no netlink support.  */
+      __no_netlink_support = 1;
+#else
+      /* We cannot determine what interfaces are available.  Be
+	 pessimistic.  */
+      *seen_ipv4 = true;
+      *seen_ipv6 = true;
+#endif
+    }
+
+#if __ASSUME_NETLINK_SUPPORT == 0
+  /* No netlink.  Get the interface list via getifaddrs.  */
+  struct ifaddrs *ifa = NULL;
+  if (getifaddrs (&ifa) != 0)
+    {
+      /* We cannot determine what interfaces are available.  Be
+	 pessimistic.  */
+      *seen_ipv4 = true;
+      *seen_ipv6 = true;
+      return;
+    }
+
+  struct ifaddrs *runp;
+  for (runp = ifa; runp != NULL; runp = runp->ifa_next)
+    if (runp->ifa_addr->sa_family == PF_INET)
+      *seen_ipv4 = true;
+    else if (runp->ifa_addr->sa_family == PF_INET6)
+      *seen_ipv6 = true;
+
+  (void) freeifaddrs (ifa);
+#endif
+}
Index: sysdeps/unix/sysv/linux/arm/eabi/check_pf.c
===================================================================
RCS file: sysdeps/unix/sysv/linux/arm/eabi/check_pf.c
diff -N sysdeps/unix/sysv/linux/arm/eabi/check_pf.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ sysdeps/unix/sysv/linux/arm/eabi/check_pf.c	31 Oct 2006 17:29:58 -0000
@@ -0,0 +1 @@
+#include <sysdeps/unix/sysv/linux/check_pf.c>