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Go Back   Linux Archive > Redhat > Cluster Development

 
 
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Old 06-27-2012, 09:48 AM
"Fabio M. Di Nitto"
 
Default cman-preconfig: allow host aliases as valid cluster nodenames

From: "Fabio M. Di Nitto" <fdinitto@redhat.com>

Resolves: rhbz#786118

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
---
cman/daemon/cman-preconfig.c | 91 +++++++++++++++++++++++++++++++++++-------
1 files changed, 76 insertions(+), 15 deletions(-)

diff --git a/cman/daemon/cman-preconfig.c b/cman/daemon/cman-preconfig.c
index d88ff3d..68fec22 100644
--- a/cman/daemon/cman-preconfig.c
+++ b/cman/daemon/cman-preconfig.c
@@ -451,7 +451,7 @@ static int verify_nodename(struct objdb_iface_ver0 *objdb, char *node)
struct sockaddr *sa;
hdb_handle_t nodes_handle;
hdb_handle_t find_handle = 0;
- int error;
+ int found = 0;

/* nodename is either from commandline or from uname */
if (nodelist_byname(objdb, cluster_parent_handle, node))
@@ -497,12 +497,11 @@ static int verify_nodename(struct objdb_iface_ver0 *objdb, char *node)
}
objdb->object_find_destroy(find_handle);

-
- /* The cluster.conf names may not be related to uname at all,
- they may match a hostname on some network interface.
- NOTE: This is IPv4 only */
- error = getifaddrs(&ifa_list);
- if (error)
+ /*
+ * The cluster.conf names may not be related to uname at all,
+ * they may match a hostname on some network interface.
+ */
+ if (getifaddrs(&ifa_list))
return -1;

for (ifa = ifa_list; ifa; ifa = ifa->ifa_next) {
@@ -521,12 +520,13 @@ static int verify_nodename(struct objdb_iface_ver0 *objdb, char *node)
if (sa->sa_family == AF_INET6)
salen = sizeof(struct sockaddr_in6);

- error = getnameinfo(sa, salen, nodename2,
- sizeof(nodename2), NULL, 0, 0);
- if (!error) {
+ if (getnameinfo(sa, salen,
+ nodename2, sizeof(nodename2),
+ NULL, 0, 0) == 0) {

if (nodelist_byname(objdb, cluster_parent_handle, nodename2)) {
strncpy(node, nodename2, sizeof(nodename) - 1);
+ found = 1;
goto out;
}

@@ -537,27 +537,88 @@ static int verify_nodename(struct objdb_iface_ver0 *objdb, char *node)

if (nodelist_byname(objdb, cluster_parent_handle, nodename2)) {
strncpy(node, nodename2, sizeof(nodename) - 1);
+ found = 1;
goto out;
}
}
}

/* See if it's the IP address that's in cluster.conf */
- error = getnameinfo(sa, sizeof(*sa), nodename2,
- sizeof(nodename2), NULL, 0, NI_NUMERICHOST);
- if (error)
+ if (getnameinfo(sa, sizeof(*sa),
+ nodename2, sizeof(nodename2),
+ NULL, 0, NI_NUMERICHOST))
continue;

if (nodelist_byname(objdb, cluster_parent_handle, nodename2)) {
strncpy(node, nodename2, sizeof(nodename) - 1);
+ found = 1;
goto out;
}
}

- error = -1;
out:
+ if (found) {
+ freeifaddrs(ifa_list);
+ return 0;
+ }
+
+ /*
+ * This section covers the usecase where the nodename specified in cluster.conf
+ * is an alias specified in /etc/hosts. For example:
+ * <ipaddr> hostname alias1 alias2
+ * and <clusternode name="alias2">
+ * the above calls use uname and getnameinfo does not return aliases.
+ * here we take the name specified in cluster.conf, resolve it to an address
+ * and then compare against all known local ip addresses.
+ * if we have a match, we found our nodename. In theory this chunk of code
+ * could replace all the checks above, but let's avoid any possible regressions
+ * and use it as last.
+ */
+
+ nodes_handle = nodeslist_init(objdb, cluster_parent_handle, &find_handle);
+ while (nodes_handle) {
+ char *dbnodename = NULL;
+ struct addrinfo hints;
+ struct addrinfo *result = NULL, *rp = NULL;
+
+ if (objdb_get_string(objdb, nodes_handle, "name", &dbnodename)) {
+ goto next;
+ }
+
+ memset(&hints, 0, sizeof(struct addrinfo));
+ hints.ai_family = AF_UNSPEC;
+ hints.ai_socktype = SOCK_DGRAM;
+ hints.ai_flags = 0;
+ hints.ai_protocol = IPPROTO_UDP;
+
+ if (getaddrinfo(dbnodename, NULL, &hints, &result))
+ goto next;
+
+ for (rp = result; rp != NULL; rp = rp->ai_next) {
+ for (ifa = ifa_list; ifa; ifa = ifa->ifa_next) {
+ if (ipaddr_equal((struct sockaddr_storage *)rp->ai_addr,
+ (struct sockaddr_storage *)ifa->ifa_addr)) {
+ freeaddrinfo(result);
+ strncpy(node, dbnodename, sizeof(nodename) - 1);
+ found = 1;
+ goto out2;
+ }
+ }
+ }
+
+ freeaddrinfo(result);
+ next:
+ nodes_handle = nodeslist_next(objdb, find_handle);
+ }
+ out2:
+ objdb->object_find_destroy(find_handle);
freeifaddrs(ifa_list);
- return error;
+
+ if (found) {
+ return 0;
+ }
+
+ return -1;
}

/* Get any environment variable overrides */
--
1.7.7.6
 

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