Example #1
0
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			printf("Domain no longer active or moved away ..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;
}
Example #2
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;
}