]>
Commit | Line | Data |
---|---|---|
f8abcd46 AF |
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 <net/if.h> | |
13 | #include <sys/ioctl.h> | |
14 | #include <linux/if_tun.h> | |
15 | ||
16 | static void Usage(char *name) | |
17 | { | |
18 | fprintf(stderr, "Create: %s [-b] [-u owner] [-t device-name] " | |
19 | "[-f tun-clone-device]\n", name); | |
20 | fprintf(stderr, "Delete: %s -d device-name [-f tun-clone-device]\n\n", | |
21 | name); | |
22 | fprintf(stderr, "The default tun clone device is /dev/net/tun - some systems" | |
23 | " use\n/dev/misc/net/tun instead\n\n"); | |
24 | fprintf(stderr, "-b will result in brief output (just the device name)\n"); | |
25 | exit(1); | |
26 | } | |
27 | ||
28 | int main(int argc, char **argv) | |
29 | { | |
30 | struct ifreq ifr; | |
31 | struct passwd *pw; | |
32 | long owner = geteuid(); | |
33 | int tap_fd, opt, delete = 0, brief = 0; | |
34 | char *tun = "", *file = "/dev/net/tun", *name = argv[0], *end; | |
35 | ||
36 | while((opt = getopt(argc, argv, "bd:f:t:u:")) > 0){ | |
37 | switch(opt) { | |
38 | case 'b': | |
39 | brief = 1; | |
40 | break; | |
41 | case 'd': | |
42 | delete = 1; | |
43 | tun = optarg; | |
44 | break; | |
45 | case 'f': | |
46 | file = optarg; | |
47 | break; | |
48 | case 'u': | |
49 | pw = getpwnam(optarg); | |
50 | if(pw != NULL){ | |
51 | owner = pw->pw_uid; | |
52 | break; | |
53 | } | |
54 | owner = strtol(optarg, &end, 0); | |
55 | if(*end != '\0'){ | |
56 | fprintf(stderr, "'%s' is neither a username nor a numeric uid.\n", | |
57 | optarg); | |
58 | Usage(name); | |
59 | } | |
60 | break; | |
61 | case 't': | |
62 | tun = optarg; | |
63 | break; | |
64 | case 'h': | |
65 | default: | |
66 | Usage(name); | |
67 | } | |
68 | } | |
69 | ||
70 | argv += optind; | |
71 | argc -= optind; | |
72 | ||
73 | if(argc > 0) | |
74 | Usage(name); | |
75 | ||
76 | if((tap_fd = open(file, O_RDWR)) < 0){ | |
77 | fprintf(stderr, "Failed to open '%s' : ", file); | |
78 | perror(""); | |
79 | exit(1); | |
80 | } | |
81 | ||
82 | memset(&ifr, 0, sizeof(ifr)); | |
83 | ||
84 | ifr.ifr_flags = IFF_TAP | IFF_NO_PI; | |
85 | strncpy(ifr.ifr_name, tun, sizeof(ifr.ifr_name) - 1); | |
86 | if(ioctl(tap_fd, TUNSETIFF, (void *) &ifr) < 0){ | |
87 | perror("TUNSETIFF"); | |
88 | exit(1); | |
89 | } | |
90 | ||
91 | if(delete){ | |
92 | if(ioctl(tap_fd, TUNSETPERSIST, 0) < 0){ | |
93 | perror("TUNSETPERSIST"); | |
94 | exit(1); | |
95 | } | |
96 | printf("Set '%s' nonpersistent\n", ifr.ifr_name); | |
97 | } | |
98 | else { | |
99 | if(ioctl(tap_fd, TUNSETPERSIST, 1) < 0){ | |
100 | perror("TUNSETPERSIST"); | |
101 | exit(1); | |
102 | } | |
103 | if(ioctl(tap_fd, TUNSETOWNER, owner) < 0){ | |
104 | perror("TUNSETPERSIST"); | |
105 | exit(1); | |
106 | } | |
107 | if(brief) | |
108 | printf("%s\n", ifr.ifr_name); | |
109 | else printf("Set '%s' persistent and owned by uid %ld\n", ifr.ifr_name, | |
110 | owner); | |
111 | } | |
112 | return(0); | |
113 | } |