static int check_ns_file(char *ns_file)
{
int pid, ret, proc_dir;
if (!check_int_str(ns_file)) {
pid = atoi(ns_file);
if (pid <= 0) {
pr_perror("Invalid join_ns pid %s", ns_file);
return -1;
}
proc_dir = open_pid_proc(pid);
if (proc_dir < 0) {
pr_perror("Invalid join_ns pid: /proc/%s not found", ns_file);
return -1;
}
return 0;
}
ret = access(ns_file, 0);
if (ret < 0) {
pr_perror("Can't access join-ns file: %s", ns_file);
return -1;
}
return 0;
}
static unsigned int __get_ns_id(int pid, struct ns_desc *nd, protobuf_c_boolean *supported, struct ns_id **ns)
{
int proc_dir;
unsigned int kid;
char ns_path[10];
struct stat st;
proc_dir = open_pid_proc(pid);
if (proc_dir < 0)
return 0;
sprintf(ns_path, "ns/%s", nd->str);
if (fstatat(proc_dir, ns_path, &st, 0)) {
if (errno == ENOENT) {
/* The namespace is unsupported */
kid = 0;
goto out;
}
pr_perror("Unable to stat %s", ns_path);
return -1;
}
kid = st.st_ino;
BUG_ON(!kid);
out:
if (supported)
*supported = kid != 0;
return generate_ns_id(pid, kid, nd, ns);
}
int do_open_proc(pid_t pid, int flags, const char *fmt, ...)
{
char path[128];
va_list args;
int dirfd = open_pid_proc(pid);
if (dirfd < 0)
return -1;
va_start(args, fmt);
vsnprintf(path, sizeof(path), fmt, args);
va_end(args);
return openat(dirfd, path, flags);
}
static unsigned int get_ns_id(int pid, struct ns_desc *nd)
{
int proc_dir, ret;
unsigned int kid;
char ns_path[10], ns_id[32];
proc_dir = open_pid_proc(pid);
if (proc_dir < 0)
return 0;
sprintf(ns_path, "ns/%s", nd->str);
ret = readlinkat(proc_dir, ns_path, ns_id, sizeof(ns_id));
if (ret < 0) {
pr_perror("Can't readlink ns link");
return 0;
}
kid = parse_ns_link(ns_id, ret, nd);
BUG_ON(!kid);
return generate_ns_id(pid, kid, nd);
}
