2.5-18.1

1 files changed, 127 insertions, 16 deletions

diff --git a/sysdeps/unix/sysv/linux/check_pf.c b/sysdeps/unix/sysv/linux/check_pf.c
index 69924769bc..46161a806a 100644
--- a/sysdeps/unix/sysv/linux/check_pf.c
+++ b/sysdeps/unix/sysv/linux/check_pf.c
@@ -1,5 +1,5 @@
 /* Determine protocol families for which interfaces exist.  Linux version.
-   Copyright (C) 2003 Free Software Foundation, Inc.
+   Copyright (C) 2003, 2006, 2007 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
@@ -17,9 +17,11 @@
    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>
@@ -29,16 +31,30 @@
 #include <linux/netlink.h>
 #include <linux/rtnetlink.h>
 
-#include "kernel-features.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)
+make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6,
+	      struct in6addrinfo **in6ai, size_t *in6ailen)
 {
-  struct
+  struct req
   {
     struct nlmsghdr nlh;
     struct rtgenmsg g;
+    /* struct rtgenmsg consists of a single byte.  This means there
+       are three bytes of padding included in the REQ definition.
+       We make them explicit here.  */
+    char pad[3];
   } req;
   struct sockaddr_nl nladdr;
 
@@ -49,20 +65,50 @@ make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6)
   req.nlh.nlmsg_seq = time (NULL);
   req.g.rtgen_family = AF_UNSPEC;
 
+  assert (sizeof (req) - offsetof (struct req, pad) == 3);
+  memset (req.pad, '\0', sizeof (req.pad));
+
   memset (&nladdr, '\0', sizeof (nladdr));
   nladdr.nl_family = AF_NETLINK;
 
+#ifdef PAGE_SIZE
+  /* Help the compiler optimize out the malloc call if PAGE_SIZE
+     is constant and smaller or equal to PTHREAD_STACK_MIN/4.  */
+  const size_t buf_size = PAGE_SIZE;
+#else
+  const size_t buf_size = __getpagesize ();
+#endif
+  bool use_malloc = false;
+  char *buf;
+
+  if (__libc_use_alloca (buf_size))
+    buf = alloca (buf_size);
+  else
+    {
+      buf = malloc (buf_size);
+      if (buf != NULL)
+	use_malloc = true;
+      else
+	goto out_fail;
+    }
+
+  struct iovec iov = { buf, buf_size };
+
   if (TEMP_FAILURE_RETRY (__sendto (fd, (void *) &req, sizeof (req), 0,
 				    (struct sockaddr *) &nladdr,
 				    sizeof (nladdr))) < 0)
-    return -1;
+    goto out_fail;
 
   *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
     {
@@ -76,10 +122,10 @@ make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6)
 
       ssize_t read_len = TEMP_FAILURE_RETRY (__recvmsg (fd, &msg, 0));
       if (read_len < 0)
-	return -1;
+	goto out_fail;
 
       if (msg.msg_flags & MSG_TRUNC)
-	return -1;
+	goto out_fail;
 
       struct nlmsghdr *nlmh;
       for (nlmh = (struct nlmsghdr *) buf;
@@ -101,6 +147,47 @@ make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6)
 		  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.  */
@@ -110,14 +197,36 @@ make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6)
 	  else if (nlmh->nlmsg_type == NLMSG_DONE)
 	    /* We found the end, leave the loop.  */
 	    done = true;
-	  else ;
 	}
     }
   while (! done);
 
-  __close (fd);
+  close_not_cancel_no_status (fd);
+
+  if (in6ailist != NULL)
+    {
+      *in6ai = malloc (in6ailistlen * sizeof (**in6ai));
+      if (*in6ai == NULL)
+	goto out_fail;
+
+      *in6ailen = in6ailistlen;
 
+      do
+	{
+	  (*in6ai)[--in6ailistlen] = in6ailist->info;
+	  in6ailist = in6ailist->next;
+	}
+      while (in6ailist != NULL);
+    }
+
+  if (use_malloc)
+    free (buf);
   return 0;
+
+out_fail:
+  if (use_malloc)
+    free (buf);
+  return -1;
 }
 
 
@@ -133,8 +242,12 @@ extern int __no_netlink_support attribute_hidden;
 
 void
 attribute_hidden
-__check_pf (bool *seen_ipv4, bool *seen_ipv6)
+__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);
@@ -148,7 +261,8 @@ __check_pf (bool *seen_ipv4, bool *seen_ipv6)
       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) == 0)
+	  && make_request (fd, nladdr.nl_pid, seen_ipv4, seen_ipv6,
+			   in6ai, in6ailen) == 0)
 	/* It worked.  */
 	return;
 
@@ -178,9 +292,6 @@ __check_pf (bool *seen_ipv4, bool *seen_ipv6)
       return;
     }
 
-  *seen_ipv4 = false;
-  *seen_ipv6 = false;
-
   struct ifaddrs *runp;
   for (runp = ifa; runp != NULL; runp = runp->ifa_next)
     if (runp->ifa_addr->sa_family == PF_INET)