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-rw-r--r--meta/packages/qemu/qemu-helper/tunctl.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/meta/packages/qemu/qemu-helper/tunctl.c b/meta/packages/qemu/qemu-helper/tunctl.c
new file mode 100644
index 0000000000..16e24a2add
--- /dev/null
+++ b/meta/packages/qemu/qemu-helper/tunctl.c
@@ -0,0 +1,156 @@
1/* Copyright 2002 Jeff Dike
2 * Licensed under the GPL
3 */
4
5#include <stdio.h>
6#include <stdlib.h>
7#include <string.h>
8#include <errno.h>
9#include <fcntl.h>
10#include <unistd.h>
11#include <pwd.h>
12#include <grp.h>
13#include <net/if.h>
14#include <sys/ioctl.h>
15#include <linux/if_tun.h>
16
17/* TUNSETGROUP appeared in 2.6.23 */
18#ifndef TUNSETGROUP
19#define TUNSETGROUP _IOW('T', 206, int)
20#endif
21
22static void Usage(char *name)
23{
24 fprintf(stderr, "Create: %s [-b] [-u owner] [-g group] [-t device-name] "
25 "[-f tun-clone-device]\n", name);
26 fprintf(stderr, "Delete: %s -d device-name [-f tun-clone-device]\n\n",
27 name);
28 fprintf(stderr, "The default tun clone device is /dev/net/tun - some systems"
29 " use\n/dev/misc/net/tun instead\n\n");
30 fprintf(stderr, "-b will result in brief output (just the device name)\n");
31 exit(1);
32}
33
34int main(int argc, char **argv)
35{
36 struct ifreq ifr;
37 struct passwd *pw;
38 struct group *gr;
39 uid_t owner = -1;
40 gid_t group = -1;
41 int tap_fd, opt, delete = 0, brief = 0;
42 char *tun = "", *file = "/dev/net/tun", *name = argv[0], *end;
43
44 while((opt = getopt(argc, argv, "bd:f:t:u:g:")) > 0){
45 switch(opt) {
46 case 'b':
47 brief = 1;
48 break;
49 case 'd':
50 delete = 1;
51 tun = optarg;
52 break;
53 case 'f':
54 file = optarg;
55 break;
56 case 'u':
57 pw = getpwnam(optarg);
58 if(pw != NULL){
59 owner = pw->pw_uid;
60 break;
61 }
62 owner = strtol(optarg, &end, 0);
63 if(*end != '\0'){
64 fprintf(stderr, "'%s' is neither a username nor a numeric uid.\n",
65 optarg);
66 Usage(name);
67 }
68 break;
69 case 'g':
70 gr = getgrnam(optarg);
71 if(gr != NULL){
72 group = gr->gr_gid;
73 break;
74 }
75 group = strtol(optarg, &end, 0);
76 if(*end != '\0'){
77 fprintf(stderr, "'%s' is neither a groupname nor a numeric group.\n",
78 optarg);
79 Usage(name);
80 }
81 break;
82
83 case 't':
84 tun = optarg;
85 break;
86 case 'h':
87 default:
88 Usage(name);
89 }
90 }
91
92 argv += optind;
93 argc -= optind;
94
95 if(argc > 0)
96 Usage(name);
97
98 if((tap_fd = open(file, O_RDWR)) < 0){
99 fprintf(stderr, "Failed to open '%s' : ", file);
100 perror("");
101 exit(1);
102 }
103
104 memset(&ifr, 0, sizeof(ifr));
105
106 ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
107 strncpy(ifr.ifr_name, tun, sizeof(ifr.ifr_name) - 1);
108 if(ioctl(tap_fd, TUNSETIFF, (void *) &ifr) < 0){
109 perror("TUNSETIFF");
110 exit(1);
111 }
112
113 if(delete){
114 if(ioctl(tap_fd, TUNSETPERSIST, 0) < 0){
115 perror("disabling TUNSETPERSIST");
116 exit(1);
117 }
118 printf("Set '%s' nonpersistent\n", ifr.ifr_name);
119 }
120 else {
121 /* emulate behaviour prior to TUNSETGROUP */
122 if(owner == -1 && group == -1) {
123 owner = geteuid();
124 }
125
126 if(owner != -1) {
127 if(ioctl(tap_fd, TUNSETOWNER, owner) < 0){
128 perror("TUNSETOWNER");
129 exit(1);
130 }
131 }
132 if(group != -1) {
133 if(ioctl(tap_fd, TUNSETGROUP, group) < 0){
134 perror("TUNSETGROUP");
135 exit(1);
136 }
137 }
138
139 if(ioctl(tap_fd, TUNSETPERSIST, 1) < 0){
140 perror("enabling TUNSETPERSIST");
141 exit(1);
142 }
143
144 if(brief)
145 printf("%s\n", ifr.ifr_name);
146 else {
147 printf("Set '%s' persistent and owned by", ifr.ifr_name);
148 if(owner != -1)
149 printf(" uid %d", owner);
150 if(group != -1)
151 printf(" gid %d", group);
152 printf("\n");
153 }
154 }
155 return(0);
156}