+++ /dev/null
-/* enter_topo.c Vsys script to switch a vserver into experiment mode in which it has access
- * to the Topology. Install in /vsys and invoke as echo $$ > /vsys/enter_topo.in
- * from within the slice.
- * 3/21/2008 Sapan Bhatia
- */
-
-#include <sys/syscall.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <string.h>
-
-#ifndef CLONE_NEWNET
-#define CLONE_NEWNET 0x40000000 /* New network namespace (lo, device, names sockets, etc) */
-#endif
-
-#define __NR_set_space 327
-#define PATHLEN 1024
-
-int set_space(int pid, int id, int toggle, unsigned long unshare_flags) {
- return syscall(__NR_set_space, pid, id, toggle, unshare_flags);
-}
-
-int get_slice_xid(char *slice_name) {
- char slicepath[PATHLEN];
- FILE *fp;
- int xid;
- snprintf(slicepath, sizeof(slicepath), "/etc/vservers/%s/context",
- slice_name);
-
- if ((fp = fopen(slicepath, "r")) == NULL) {
- printf("Could not open %s\n", slicepath);
- return -1;
- }
-
- if (fscanf(fp, "%d", &xid)==0) {
- printf("Could not read ctx file\n");
- return -1;
- }
-
- fclose (fp);
- return xid;
-}
-
-int verify_ownership(int pid, int arg_xid) {
- char procpath[PATHLEN];
- FILE *fp;
- int xid;
- snprintf(procpath, sizeof(procpath), "/proc/%d/vinfo", pid);
-
- if ((fp = fopen(procpath, "r")) == NULL) {
- printf("Could not open %s\n", procpath);
- return -1;
- }
-
- if (fscanf(fp, "XID: %d", &xid)==0) {
- printf("Could not read ctx file\n");
- return -1;
- }
-
- fclose (fp);
- return (arg_xid==xid);
-
-}
-
-int main(int argc, char *argv[]) {
- int xid;
- int pid;
-
- if (argc < 1) {
- printf("Slice name missing. Was I invoked by vsys?\n");
- exit(1);
- }
-
- scanf("%d",&pid);
-
- if ((xid = get_slice_xid(argv[1]))==-1) {
- printf("Could not get xid for slice %s\n",argv[1]);
- exit(1);
- }
-
- if (!verify_ownership(pid, xid)) {
- printf("Does xid %d really own %d?\n",xid,pid);
- exit(1);
- }
-
- set_space(pid, xid, 1, CLONE_NEWNET);
-}