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#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <time.h>
#include <sys/syslog.h>
#include <sys/utsname.h>
#include <xs.h>
#include "list.h"
#include "xs_tools.h"
#include "mdns-publish.h"
/* ------------------------------------------------------------- */
struct dom {
int domid;
char name[128];
int destroyed;
char label[256];
int vnc_port;
int published;
struct mdns_pub_entry *entry;
struct list_head next;
};
static LIST_HEAD(doms);
static struct utsname uts;
/* ------------------------------------------------------------- */
static struct dom *find_dom(int domid)
{
struct dom *dom;
struct list_head *item;
list_for_each(item, &doms) {
dom = list_entry(item, struct dom, next);
if (dom->domid == domid)
return dom;
}
return NULL;
}
static struct dom *get_dom(int domid)
{
struct dom *dom;
dom = find_dom(domid);
if (!dom) {
dom = malloc(sizeof(*dom));
memset(dom,0,sizeof(*dom));
dom->domid = domid;
list_add_tail(&dom->next, &doms);
}
return dom;
}
static void try_attach_domain(struct mdns_pub *mdns, struct dom *dom, int boot)
{
if (dom->published)
return;
if (!strlen(dom->name))
return;
if (!dom->vnc_port)
return;
snprintf(dom->label, sizeof(dom->label), "Xen guest %s (%s, #%d)",
dom->name, uts.nodename, dom->domid);
mdns_log_printf(mdns, LOG_INFO, "pub: %s (%d)\n", dom->name, dom->domid);
dom->entry = mdns_pub_add(mdns, dom->label, "_rfb._tcp", dom->vnc_port, NULL);
dom->published = 1;
}
static void try_release_domain(struct mdns_pub *mdns, struct dom *dom)
{
if (!dom->destroyed)
return;
if (dom->published) {
mdns_log_printf(mdns, LOG_INFO, "del: %s (%d)\n", dom->name, dom->domid);
mdns_pub_del(dom->entry);
}
list_del(&dom->next);
free(dom);
}
/* ------------------------------------------------------------- */
static void usage(FILE *fp)
{
fprintf(fp, "usage: [fixme]\n");
}
int main(int argc, char *argv[])
{
struct mdns_pub *mdns = NULL;
struct xs_handle *xenstore = NULL;
xs_transaction_t xst;
char **vec = NULL;
int domid, c;
int debug = 0;
char path[128], value[128];
unsigned int count, i, rc;
struct dom *dom;
fd_set set;
for (;;) {
if (-1 == (c = getopt(argc, argv, "hd")))
break;
switch (c) {
case 'd':
debug++;
break;
case 'h':
usage(stdout);
exit(0);
default:
usage(stderr);
exit(1);
}
}
mdns_pub_appname = "mdns-publish-vnc";
uname(&uts);
if (!debug)
mdns_daemonize();
/* connect to xenstore */
xenstore = xenstore_open(1,1,1,1);
if (NULL == xenstore) {
mdns_log_printf(mdns, LOG_ERR, "can't access xenstore, exiting\n");
exit(1);
}
xs_watch(xenstore, "/local/domain", "token");
mdns = mdns_pub_init(debug);
if (NULL == mdns)
exit(1);
mdns_sigsetup(mdns);
mdns_pub_start(mdns);
/* look for running domains */
if (!(xst = xs_transaction_start(xenstore))) {
mdns_log_printf(mdns, LOG_ERR, "Oops, can't start xenstore transaction\n");
exit(1);
}
vec = xs_directory(xenstore, xst, "/local/domain", &count);
xs_transaction_end(xenstore, xst, 0);
fprintf(stderr,"looking for existing domains\n");
for (i = 0; i < count; i++) {
domid = atoi(vec[i]);
dom = get_dom(domid);
snprintf(path, sizeof(path), "/local/domain/%d/name", domid);
xenstore_read(xenstore, path, dom->name, sizeof(dom->name));
snprintf(path, sizeof(path), "/local/domain/%d/console/vnc-port", domid);
if (0 == xenstore_read(xenstore, path, value, sizeof(value)))
dom->vnc_port = atoi(value);
try_attach_domain(mdns, dom, 1);
}
/* main loop */
fprintf(stderr,"ok, watching out for changes now\n");
for (;;) {
if (mdns_pub_appquit)
break;
FD_ZERO(&set);
FD_SET(xs_fileno(xenstore), &set);
switch (select(xs_fileno(xenstore)+1, &set, NULL, NULL, NULL)) {
case -1:
if (EINTR == errno)
continue; /* termsig check */
perror("select");
break;
case 0:
fprintf(stderr,"Huh, select() timeout?\n");
mdns_pub_appquit++;
break;
default:
break;
}
if (vec)
free(vec);
vec = xs_read_watch(xenstore, &count);
if (NULL == vec) {
fprintf(stderr,"xs_read_watch() failed\n");
exit(1);
}
if (2 != sscanf(vec[XS_WATCH_PATH], "/local/domain/%d/%64s", &domid, path)) {
if (1 != sscanf(vec[XS_WATCH_PATH], "/local/domain/%d", &domid))
continue;
strcpy(path, "");
}
dom = get_dom(domid);
if (0 == strcmp(path,"")) {
rc = xenstore_read(xenstore, vec[XS_WATCH_PATH], value, sizeof(value));
if (0 != rc)
dom->destroyed = 1;
} else if (0 == strcmp(path, "name")) {
rc = xenstore_read(xenstore, vec[XS_WATCH_PATH], value, sizeof(value));
if (0 != rc)
continue;
strcpy(dom->name, value);
mdns_log_printf(mdns, LOG_INFO, "new: %s (%d)\n", dom->name, dom->domid);
} else if (0 == strcmp(path, "console/vnc-port")) {
rc = xenstore_read(xenstore, vec[XS_WATCH_PATH], value, sizeof(value));
if (0 != rc)
continue;
dom->vnc_port = atoi(value);
} else {
continue;
}
try_attach_domain(mdns, dom, 0);
try_release_domain(mdns, dom);
}
mdns_pub_del_all(mdns);
mdns_pub_stop(mdns);
mdns_pub_fini(mdns);
return 0;
}
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