1 files changed, 77 insertions, 0 deletions
diff --git a/srcx/jails.c b/srcx/jails.c
new file mode 100644
index 0000000..aac6a31
--- /dev/null
+++ b/srcx/jails.c
@@ -0,0 +1,77 @@
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <kvm.h>
+#include <paths.h>
+
+#include "util.h"
+
+#ifdef HAVE_CONFIG_H
+#include "../config.h"
+#endif
+
+static void usage();
+static void list_jails();
+
+int main(int argc, char* argv[])
+{
+	if(argc > 1)
+		usage();
+
+	if(in_jail())
+		errx(1, "can't run from inside jail");
+
+	list_jails();
+	return 0;
+}
+
+static void usage()
+{
+	fprintf(stderr, "usage: jails \n");
+	exit(2);
+}
+
+static void list_jails()
+{
+	struct xprison* sxp;
+	struct xprison* xp;
+	size_t len, i;
+
+	/* ... otherwise it's a name */
+
+  if(sysctlbyname("security.jail.list", NULL, &len, NULL, 0) == -1)
+  	err(1, "couldn't list jails");
+
+retry:
+
+	if(len <= 0)
+		return;
+
+	sxp = xp = calloc(len, 1);
+	if(sxp == NULL)
+		err(1, "out of memory");
+
+	if(sysctlbyname("security.jail.list", xp, &len, NULL, 0) == -1)
+	{
+		if(errno == ENOMEM)
+		{
+			free(sxp);
+			goto retry;
+		}
+
+		err(1, "couldn't list jails");
+	}
+
+	if(len < sizeof(*xp) || len % sizeof(*xp) || xp->pr_version != XPRISON_VERSION)
+		errx(1, "kernel and userland out of sync");
+
+	jid = -1;
+
+	for(i = 0; i < (len / sizeof(*xp)); i++)
+		printf("%s\n", xp->pr_host);
+
+	free(sxp);
+}
+