mirror of https://gerrit.osmocom.org/osmo-tetra
Import tunctl from uml-utilities project
This commit is contained in:
parent
4911ba91ef
commit
ceaf34016a
|
@ -0,0 +1,156 @@
|
|||
/* Copyright 2002 Jeff Dike
|
||||
* Licensed under the GPL
|
||||
*/
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <errno.h>
|
||||
#include <fcntl.h>
|
||||
#include <unistd.h>
|
||||
#include <pwd.h>
|
||||
#include <grp.h>
|
||||
#include <net/if.h>
|
||||
#include <sys/ioctl.h>
|
||||
#include <linux/if_tun.h>
|
||||
|
||||
/* TUNSETGROUP appeared in 2.6.23 */
|
||||
#ifndef TUNSETGROUP
|
||||
#define TUNSETGROUP _IOW('T', 206, int)
|
||||
#endif
|
||||
|
||||
static void Usage(char *name)
|
||||
{
|
||||
fprintf(stderr, "Create: %s [-b] [-u owner] [-g group] [-t device-name] "
|
||||
"[-f tun-clone-device]\n", name);
|
||||
fprintf(stderr, "Delete: %s -d device-name [-f tun-clone-device]\n\n",
|
||||
name);
|
||||
fprintf(stderr, "The default tun clone device is /dev/net/tun - some systems"
|
||||
" use\n/dev/misc/net/tun instead\n\n");
|
||||
fprintf(stderr, "-b will result in brief output (just the device name)\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
struct ifreq ifr;
|
||||
struct passwd *pw;
|
||||
struct group *gr;
|
||||
uid_t owner = -1;
|
||||
gid_t group = -1;
|
||||
int tap_fd, opt, delete = 0, brief = 0;
|
||||
char *tun = "", *file = "/dev/net/tun", *name = argv[0], *end;
|
||||
|
||||
while((opt = getopt(argc, argv, "bd:f:t:u:g:")) > 0){
|
||||
switch(opt) {
|
||||
case 'b':
|
||||
brief = 1;
|
||||
break;
|
||||
case 'd':
|
||||
delete = 1;
|
||||
tun = optarg;
|
||||
break;
|
||||
case 'f':
|
||||
file = optarg;
|
||||
break;
|
||||
case 'u':
|
||||
pw = getpwnam(optarg);
|
||||
if(pw != NULL){
|
||||
owner = pw->pw_uid;
|
||||
break;
|
||||
}
|
||||
owner = strtol(optarg, &end, 0);
|
||||
if(*end != '\0'){
|
||||
fprintf(stderr, "'%s' is neither a username nor a numeric uid.\n",
|
||||
optarg);
|
||||
Usage(name);
|
||||
}
|
||||
break;
|
||||
case 'g':
|
||||
gr = getgrnam(optarg);
|
||||
if(gr != NULL){
|
||||
group = gr->gr_gid;
|
||||
break;
|
||||
}
|
||||
group = strtol(optarg, &end, 0);
|
||||
if(*end != '\0'){
|
||||
fprintf(stderr, "'%s' is neither a groupname nor a numeric group.\n",
|
||||
optarg);
|
||||
Usage(name);
|
||||
}
|
||||
break;
|
||||
|
||||
case 't':
|
||||
tun = optarg;
|
||||
break;
|
||||
case 'h':
|
||||
default:
|
||||
Usage(name);
|
||||
}
|
||||
}
|
||||
|
||||
argv += optind;
|
||||
argc -= optind;
|
||||
|
||||
if(argc > 0)
|
||||
Usage(name);
|
||||
|
||||
if((tap_fd = open(file, O_RDWR)) < 0){
|
||||
fprintf(stderr, "Failed to open '%s' : ", file);
|
||||
perror("");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
memset(&ifr, 0, sizeof(ifr));
|
||||
|
||||
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
|
||||
strncpy(ifr.ifr_name, tun, sizeof(ifr.ifr_name) - 1);
|
||||
if(ioctl(tap_fd, TUNSETIFF, (void *) &ifr) < 0){
|
||||
perror("TUNSETIFF");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
if(delete){
|
||||
if(ioctl(tap_fd, TUNSETPERSIST, 0) < 0){
|
||||
perror("disabling TUNSETPERSIST");
|
||||
exit(1);
|
||||
}
|
||||
printf("Set '%s' nonpersistent\n", ifr.ifr_name);
|
||||
}
|
||||
else {
|
||||
/* emulate behaviour prior to TUNSETGROUP */
|
||||
if(owner == -1 && group == -1) {
|
||||
owner = geteuid();
|
||||
}
|
||||
|
||||
if(owner != -1) {
|
||||
if(ioctl(tap_fd, TUNSETOWNER, owner) < 0){
|
||||
perror("TUNSETOWNER");
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
if(group != -1) {
|
||||
if(ioctl(tap_fd, TUNSETGROUP, group) < 0){
|
||||
perror("TUNSETGROUP");
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
|
||||
if(ioctl(tap_fd, TUNSETPERSIST, 1) < 0){
|
||||
perror("enabling TUNSETPERSIST");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
if(brief)
|
||||
printf("%s\n", ifr.ifr_name);
|
||||
else {
|
||||
printf("Set '%s' persistent and owned by", ifr.ifr_name);
|
||||
if(owner != -1)
|
||||
printf(" uid %d", owner);
|
||||
if(group != -1)
|
||||
printf(" gid %d", group);
|
||||
printf("\n");
|
||||
}
|
||||
}
|
||||
return(0);
|
||||
}
|
Loading…
Reference in New Issue