Attachment 11072 Details for Bug 11282 – Patch Add IPv6 support for determining FQDN during ADS join

[patch] Patch Add IPv6 support for determining FQDN during ADS join

0001-Add-IPv6-support-for-determining-FQDN-during-ADS-joi.patch (text/plain), 4.03 KB, created by David Holder on 2015-05-20 16:17:39 UTC

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Creator: David Holder

Created: 2015-05-20 16:17:39 UTC

Size: 4.03 KB

patch

obsolete

>From 0fe65069781330052da120966b596025cd83deb1 Mon Sep 17 00:00:00 2001
>From: David Holder <david.holder@erion.co.uk>
>Date: Tue, 12 May 2015 17:40:29 +0100
>Subject: [PATCH] Add IPv6 support for determining FQDN during ADS join.
> Signed-off-by: David Holder <david.holder@erion.co.uk>
>
>---
> source3/lib/util.c |   60 +++++++++++++++++++++++++++++++--------------------
> 1 files changed, 36 insertions(+), 24 deletions(-)
>
>diff --git a/source3/lib/util.c b/source3/lib/util.c
>index ec0757e..7713074 100644
>--- a/source3/lib/util.c
>+++ b/source3/lib/util.c
>@@ -1836,48 +1836,60 @@ bool unix_wild_match(const char *pattern, const char *string)
> }
> 
> /**********************************************************************
>- Converts a name to a fully qualified domain name.
>- Returns true if lookup succeeded, false if not (then fqdn is set to name)
>- Note we deliberately use gethostbyname here, not getaddrinfo as we want
>- to examine the h_aliases and I don't know how to do that with getaddrinfo.
>-***********************************************************************/
>+  Converts a name to a fully qualified domain name.
>+  Returns true if lookup succeeded, false if not (then fqdn is set to name)
>+  Uses getaddrinfo() with AI_CANONNAME flag to obtain the official
>+  canonical name of the host. getaddrinfo() may use a variety of sources
>+  including /etc/hosts to obtain the domainname. It expects aliases in
>+  /etc/hosts to NOT be the FQDN. The FQDN should come first.
>+************************************************************************/
> 
> bool name_to_fqdn(fstring fqdn, const char *name)
> {
> 	char *full = NULL;
>-	struct hostent *hp = gethostbyname(name);
>+	struct addrinfo hints;
>+	struct addrinfo *result;
>+	int s;
>+
>+    	/* Configure hints to obtain canonical name */
>+
>+    	memset(&hints, 0, sizeof(struct addrinfo));
>+    	hints.ai_family = AF_UNSPEC;    /* Allow IPv4 or IPv6 */
>+    	hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */
>+    	hints.ai_flags = AI_CANONNAME;  /* Get host's FQDN */
>+    	hints.ai_protocol = 0;          /* Any protocol */
> 
>-	if (!hp || !hp->h_name || !*hp->h_name) {
>+    	s = getaddrinfo(name, NULL, &hints, &result);
>+    	if (s != 0) {
>+        	DEBUG(1, ("getaddrinfo: %s\n", gai_strerror(s)));
> 		DEBUG(10,("name_to_fqdn: lookup for %s failed.\n", name));
> 		fstrcpy(fqdn, name);
> 		return false;
>-	}
>-
>-	/* Find out if the fqdn is returned as an alias
>-	 * to cope with /etc/hosts files where the first
>-	 * name is not the fqdn but the short name */
>-	if (hp->h_aliases && (! strchr_m(hp->h_name, '.'))) {
>-		int i;
>-		for (i = 0; hp->h_aliases[i]; i++) {
>-			if (strchr_m(hp->h_aliases[i], '.')) {
>-				full = hp->h_aliases[i];
>-				break;
>-			}
>-		}
>+    	}
>+	full = result->ai_canonname;
>+
>+	/* Find out if the FQDN is returned as an alias
>+ 	 * to cope with /etc/hosts files where the first
>+ 	 * name is not the FQDN but the short name.
>+ 	 * getaddrinfo provides no easy way of handling aliases
>+ 	 * in /etc/hosts. Users should make sure the FQDN
>+ 	 * comes first in /etc/hosts. */
>+	if (full && (! strchr_m(full, '.'))) {
>+		DEBUG(1, ("WARNING: your /etc/hosts file may be broken!\n"));
>+		DEBUGADD(1, ("    Full qualified domain names (FQDNs) should not be specified\n"));
>+		DEBUGADD(1, ("    as an alias in /etc/hosts. FQDN should be the first name\n"));
>+		DEBUGADD(1, ("    prior to any aliases.\n"));
> 	}
> 	if (full && (strcasecmp_m(full, "localhost.localdomain") == 0)) {
> 		DEBUG(1, ("WARNING: your /etc/hosts file may be broken!\n"));
> 		DEBUGADD(1, ("    Specifying the machine hostname for address 127.0.0.1 may lead\n"));
> 		DEBUGADD(1, ("    to Kerberos authentication problems as localhost.localdomain\n"));
> 		DEBUGADD(1, ("    may end up being used instead of the real machine FQDN.\n"));
>-		full = hp->h_name;
>-	}
>-	if (!full) {
>-		full = hp->h_name;
> 	}
> 
> 	DEBUG(10,("name_to_fqdn: lookup for %s -> %s.\n", name, full));
> 	fstrcpy(fqdn, full);
>+    	freeaddrinfo(result);           /* No longer needed */
> 	return true;
> }
> 
>-- 
>1.7.1

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Attachments on bug 11282: 11072 | 11095 | 11096