int libvirt_open() {
conn = virConnectOpenReadOnly("xen:///");
if(conn == NULL) {
printf("libvirt connection open error on uri \n");
return 0;
}
int n;
n = virConnectNumOfDomains(conn);
if(n < 0) {
printf("Error reading number of domains \n");
return -1;
}
int i;
int *domids;
domids = malloc(sizeof(int) * n);
if(domids == 0) {
printf("libvirt domain ids malloc failed");
return -1;
}
n = virConnectListDomains(conn, domids, n);
if(n < 0) {
printf("Error reading list of domains \n");
free(domids);
return -1;
}
free_block_devices();
free_interface_devices();
free_domains();
for (i = 0; i < n ; ++i) {
virDomainPtr dom = NULL;
const char *name;
char *xml = NULL;
xmlDocPtr xml_doc = NULL;
xmlXPathContextPtr xpath_ctx = NULL;
xmlXPathObjectPtr xpath_obj = NULL;
int j;
//printf("Publishing Domain Id : %d \n ", domids[i]);
dom = virDomainLookupByID(conn, domids[i]);
if(dom == NULL) {
printf("Domain no longer active or moved away .. \n");
}
name = virDomainGetName(dom);
//printf("Publishing Domain Name : %s \n ", name);
if(name == NULL) {
printf("Domain name not valid .. \n");
goto cont;
}
if(add_domain(dom) < 0) {
printf("libvirt plugin malloc failed .. \n");
goto cont;
}
xml = virDomainGetXMLDesc(dom, 0);
if(!xml) {
printf("Virt domain xml description error ..\n");
goto cont;
}
//printf("Publishing XML : \n %s \n ", xml);
xml_doc = xmlReadDoc((xmlChar *) xml, NULL, NULL, XML_PARSE_NONET);
if(xml_doc == NULL) {
printf("XML read doc error ..\n");
goto cont;
}
xpath_ctx = xmlXPathNewContext(xml_doc);
xpath_obj = xmlXPathEval((xmlChar *) "/domain/devices/disk/target[@dev]", xpath_ctx);
if(xpath_obj == NULL || xpath_obj->type != XPATH_NODESET || xpath_obj->nodesetval == NULL) {
goto cont;
}
for(j = 0; j < xpath_obj->nodesetval->nodeNr; ++j) {
xmlNodePtr node;
char *path = NULL;
node = xpath_obj->nodesetval->nodeTab[j];
if(!node) continue;
path = (char *) xmlGetProp (node, (xmlChar *) "dev");
if(!path) continue;
add_block_device(dom, path);
}
xmlXPathFreeObject(xpath_obj);
xpath_obj = xmlXPathEval((xmlChar *) "/domain/devices/interface/target[@dev]", xpath_ctx);
if(xpath_obj == NULL || xpath_obj->type != XPATH_NODESET || xpath_obj->nodesetval == NULL) {
goto cont;
}
for(j = 0; j < xpath_obj->nodesetval->nodeNr; ++j) {
xmlNodePtr node;
char *path = NULL;
node = xpath_obj->nodesetval->nodeTab[j];
if(!node) continue;
path = (char *) xmlGetProp(node, (xmlChar *) "dev");
if(!path) continue;
add_interface_device(dom, path);
}
cont:
if(xpath_obj) xmlXPathFreeObject(xpath_obj);
if(xpath_ctx) xmlXPathFreeContext(xpath_ctx);
if(xml_doc) xmlFreeDoc(xml_doc);
if(xml) free(xml);
}
free(domids);
return 0;
}
static int
refresh_lists (void)
{
int n;
n = virConnectNumOfDomains (conn);
if (n < 0) {
VIRT_ERROR (conn, "reading number of domains");
return -1;
}
if (n > 0) {
int i;
int *domids;
/* Get list of domains. */
domids = malloc (sizeof (*domids) * n);
if (domids == NULL) {
ERROR (PLUGIN_NAME " plugin: malloc failed.");
return -1;
}
n = virConnectListDomains (conn, domids, n);
if (n < 0) {
VIRT_ERROR (conn, "reading list of domains");
sfree (domids);
return -1;
}
free_block_devices ();
free_interface_devices ();
free_domains ();
/* Fetch each domain and add it to the list, unless ignore. */
for (i = 0; i < n; ++i) {
virDomainPtr dom = NULL;
const char *name;
char *xml = NULL;
xmlDocPtr xml_doc = NULL;
xmlXPathContextPtr xpath_ctx = NULL;
xmlXPathObjectPtr xpath_obj = NULL;
int j;
dom = virDomainLookupByID (conn, domids[i]);
if (dom == NULL) {
VIRT_ERROR (conn, "virDomainLookupByID");
/* Could be that the domain went away -- ignore it anyway. */
continue;
}
name = virDomainGetName (dom);
if (name == NULL) {
VIRT_ERROR (conn, "virDomainGetName");
goto cont;
}
if (il_domains && ignorelist_match (il_domains, name) != 0)
goto cont;
if (add_domain (dom) < 0) {
ERROR (PLUGIN_NAME " plugin: malloc failed.");
goto cont;
}
/* Get a list of devices for this domain. */
xml = virDomainGetXMLDesc (dom, 0);
if (!xml) {
VIRT_ERROR (conn, "virDomainGetXMLDesc");
goto cont;
}
/* Yuck, XML. Parse out the devices. */
xml_doc = xmlReadDoc ((xmlChar *) xml, NULL, NULL, XML_PARSE_NONET);
if (xml_doc == NULL) {
VIRT_ERROR (conn, "xmlReadDoc");
goto cont;
}
xpath_ctx = xmlXPathNewContext (xml_doc);
/* Block devices. */
xpath_obj = xmlXPathEval
((xmlChar *) "/domain/devices/disk/target[@dev]",
xpath_ctx);
if (xpath_obj == NULL || xpath_obj->type != XPATH_NODESET ||
xpath_obj->nodesetval == NULL)
goto cont;
for (j = 0; j < xpath_obj->nodesetval->nodeNr; ++j) {
xmlNodePtr node;
char *path = NULL;
node = xpath_obj->nodesetval->nodeTab[j];
if (!node) continue;
path = (char *) xmlGetProp (node, (xmlChar *) "dev");
if (!path) continue;
if (il_block_devices &&
ignore_device_match (il_block_devices, name, path) != 0)
goto cont2;
add_block_device (dom, path);
cont2:
if (path) xmlFree (path);
}
xmlXPathFreeObject (xpath_obj);
/* Network interfaces. */
xpath_obj = xmlXPathEval
((xmlChar *) "/domain/devices/interface[target[@dev]]",
xpath_ctx);
if (xpath_obj == NULL || xpath_obj->type != XPATH_NODESET ||
xpath_obj->nodesetval == NULL)
goto cont;
xmlNodeSetPtr xml_interfaces = xpath_obj->nodesetval;
for (j = 0; j < xml_interfaces->nodeNr; ++j) {
char *path = NULL;
char *address = NULL;
xmlNodePtr xml_interface;
xml_interface = xml_interfaces->nodeTab[j];
if (!xml_interface) continue;
xmlNodePtr child = NULL;
for (child = xml_interface->children; child; child = child->next) {
if (child->type != XML_ELEMENT_NODE) continue;
if (xmlStrEqual(child->name, (const xmlChar *) "target")) {
path = (char *) xmlGetProp (child, (const xmlChar *) "dev");
if (!path) continue;
} else if (xmlStrEqual(child->name, (const xmlChar *) "mac")) {
address = (char *) xmlGetProp (child, (const xmlChar *) "address");
if (!address) continue;
}
}
if (il_interface_devices &&
(ignore_device_match (il_interface_devices, name, path) != 0 ||
ignore_device_match (il_interface_devices, name, address) != 0))
goto cont3;
add_interface_device (dom, path, address, j+1);
cont3:
if (path) xmlFree (path);
if (address) xmlFree (address);
}
cont:
if (xpath_obj) xmlXPathFreeObject (xpath_obj);
if (xpath_ctx) xmlXPathFreeContext (xpath_ctx);
if (xml_doc) xmlFreeDoc (xml_doc);
sfree (xml);
}
sfree (domids);
}
return 0;
}