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#include <stdio.h>
#include <unistd.h>
#include <errno.h>
static void Usage(void)
{
fprintf(stderr, "Usage : jail_uml jail-directory uid "
"uml-command-line ...\n");
exit(1);
}
int main(int argc, char **argv)
{
char *dir, *end;
int uid;
if(geteuid() != 0){
fprintf(stderr, "jail_uml must be run as root\n");
exit(1);
}
if(argc < 3) Usage();
dir = argv[1];
uid = strtoul(argv[2], &end, 0);
if(*end != '\0') Usage();
argc -= 3;
argv += 3;
if(chdir(dir)){
perror("chdir");
exit(1);
}
if(chroot(".")){
perror("chroot");
exit(1);
}
if(setuid(uid)){
perror("setuid");
exit(1);
}
execv(argv[0], argv);
fprintf(stderr, "execve of %s failed : ", argv[0]);
perror("");
exit(1);
}
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