Unshare netns for VINI.

[util-vserver-pl.git] / src / namespaces.c

diff --git a/src/namespaces.c b/src/namespaces.c
new file mode 100644 (file)
index 0000000..9f89bcd
--- /dev/null
+++ b/src/namespaces.c
@@ -0,0 +1,102 @@
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "vserver.h"
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <pwd.h>
+
+#ifdef CLONE_NEWNET
+#  define DECLARE_NS(X,Y) { #X, CLONE_NEW##X }
+#else
+#  warning CLONE_NEWNET not defined, using memorized value
+#  define DECLARE_NS(X,Y) { #X, Y }
+#endif
+
+#define     SPACE_DIR       "pl_spaces"
+
+static struct {
+    const char * const         id;
+    unsigned char              bit;
+} const NS2BIT[] = {
+    DECLARE_NS(NET,             32)
+
+    /* All entries between FIRST_NS and the last defined namespace
+     * must be filled in */
+    #define     FIRST_NS        32
+};
+
+int
+text2ns(const char *str)
+{
+  size_t       i;
+  for (i=0; i<sizeof(NS2BIT)/sizeof(NS2BIT[0]); ++i)
+    if (strcmp(NS2BIT[i].id, str)==0) return NS2BIT[i].bit;
+
+  return -1;
+}
+
+const char *
+ns2text(unsigned int bit)
+{
+  if ((size_t)bit>=sizeof(NS2BIT)/sizeof(NS2BIT[0])) return 0;
+  return NS2BIT[bit - FIRST_NS].id;
+}
+
+#define VSERVERCONF "/etc/vservers/"
+
+uint32_t
+get_space_flag(xid_t xid) {
+    char *ctx_space_dir, *space_name;
+    struct passwd *slice_user;
+    FILE *fp_in;
+    unsigned int bit;
+
+    slice_user = get_pwuid(xid);
+
+    if (!slice_user)
+        goto out_err1;
+
+    ctx_space_dir=(char *) malloc(sizeof(VSERVERCONF "/" SPACE_DIR "Z")+strlen(slice_user->pw_name));
+    if (!ctx_space_dir)
+        goto out_err1;
+
+    sprintf(ctx_space_dir,VSERVERCONF "%s/" SPACE_DIR, slice_user->pw_name);
+
+    fp_in = fopen(ctx_space_dir,"r");
+
+    if (!fp_in)
+        goto out_dontcare;
+
+    space_name=(char *) malloc(sizeof("GOBBLEDYGOOKZ"));
+
+    if (!space_name) {
+        goto out_err2;
+    }
+
+    fgets(space_name,sizeof("GOBBLEDYGOOKZ"),fp_in);
+
+    bit = text2ns(space_name);
+
+    free(space_name);
+    free(ctx_space_dir);
+    close(fp_in);
+
+    return ((1<<bit)>>1);
+
+out_err2:
+    free(ctx_space_dir);
+    close(fp_in);
+
+out_err1:
+    return 0;
+
+out_dontcare:
+    free(ctx_space_dir);
+    return 0;
+
+}