Squashed 'yocto-poky/' content from commit ea562de
git-subtree-dir: yocto-poky
git-subtree-split: ea562de57590c966cd5a75fda8defecd397e6436
diff --git a/meta/recipes-devtools/qemu/qemu-helper/tunctl.c b/meta/recipes-devtools/qemu/qemu-helper/tunctl.c
new file mode 100644
index 0000000..16e24a2
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu-helper/tunctl.c
@@ -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);
+}