| 1 | /* Copyright 2002 Jeff Dike
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| 2 | * Licensed under the GPL
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| 3 | */
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| 4 |
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| 5 | #include <stdio.h>
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| 6 | #include <stdlib.h>
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| 7 | #include <string.h>
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| 8 | #include <errno.h>
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| 9 | #include <fcntl.h>
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| 10 | #include <unistd.h>
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| 11 | #include <pwd.h>
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| 12 | #include <net/if.h>
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| 13 | #include <sys/ioctl.h>
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| 14 | #include <linux/if_tun.h>
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| 15 |
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| 16 | static void Usage(char *name)
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| 17 | {
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| 18 | fprintf(stderr, "Create: %s [-b] [-u owner] [-t device-name] "
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| 19 | "[-f tun-clone-device]\n", name);
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| 20 | fprintf(stderr, "Delete: %s -d device-name [-f tun-clone-device]\n\n",
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| 21 | name);
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| 22 | fprintf(stderr, "The default tun clone device is /dev/net/tun - some systems"
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| 23 | " use\n/dev/misc/net/tun instead\n\n");
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| 24 | fprintf(stderr, "-b will result in brief output (just the device name)\n");
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| 25 | exit(1);
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| 26 | }
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| 27 |
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| 28 | int main(int argc, char **argv)
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| 29 | {
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| 30 | struct ifreq ifr;
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| 31 | struct passwd *pw;
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| 32 | long owner = geteuid();
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| 33 | int tap_fd, opt, delete = 0, brief = 0;
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| 34 | char *tun = "", *file = "/dev/net/tun", *name = argv[0], *end;
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| 35 |
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| 36 | while((opt = getopt(argc, argv, "bd:f:t:u:")) > 0){
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| 37 | switch(opt) {
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| 38 | case 'b':
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| 39 | brief = 1;
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| 40 | break;
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| 41 | case 'd':
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| 42 | delete = 1;
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| 43 | tun = optarg;
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| 44 | break;
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| 45 | case 'f':
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| 46 | file = optarg;
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| 47 | break;
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| 48 | case 'u':
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| 49 | pw = getpwnam(optarg);
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| 50 | if(pw != NULL){
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| 51 | owner = pw->pw_uid;
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| 52 | break;
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| 53 | }
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| 54 | owner = strtol(optarg, &end, 0);
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| 55 | if(*end != '\0'){
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| 56 | fprintf(stderr, "'%s' is neither a username nor a numeric uid.\n",
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| 57 | optarg);
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| 58 | Usage(name);
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| 59 | }
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| 60 | break;
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| 61 | case 't':
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| 62 | tun = optarg;
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| 63 | break;
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| 64 | case 'h':
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| 65 | default:
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| 66 | Usage(name);
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| 67 | }
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| 68 | }
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| 69 |
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| 70 | argv += optind;
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| 71 | argc -= optind;
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| 72 |
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| 73 | if(argc > 0)
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| 74 | Usage(name);
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| 75 |
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| 76 | if((tap_fd = open(file, O_RDWR)) < 0){
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| 77 | fprintf(stderr, "Failed to open '%s' : ", file);
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| 78 | perror("");
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| 79 | exit(1);
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| 80 | }
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| 81 |
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| 82 | memset(&ifr, 0, sizeof(ifr));
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| 83 |
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| 84 | ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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| 85 | strncpy(ifr.ifr_name, tun, sizeof(ifr.ifr_name) - 1);
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| 86 | if(ioctl(tap_fd, TUNSETIFF, (void *) &ifr) < 0){
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| 87 | perror("TUNSETIFF");
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| 88 | exit(1);
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| 89 | }
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| 90 |
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| 91 | if(delete){
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| 92 | if(ioctl(tap_fd, TUNSETPERSIST, 0) < 0){
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| 93 | perror("TUNSETPERSIST");
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| 94 | exit(1);
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| 95 | }
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| 96 | printf("Set '%s' nonpersistent\n", ifr.ifr_name);
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| 97 | }
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| 98 | else {
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| 99 | if(ioctl(tap_fd, TUNSETPERSIST, 1) < 0){
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| 100 | perror("TUNSETPERSIST");
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| 101 | exit(1);
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| 102 | }
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| 103 | if(ioctl(tap_fd, TUNSETOWNER, owner) < 0){
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| 104 | perror("TUNSETPERSIST");
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| 105 | exit(1);
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| 106 | }
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| 107 | if(brief)
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| 108 | printf("%s\n", ifr.ifr_name);
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| 109 | else printf("Set '%s' persistent and owned by uid %ld\n", ifr.ifr_name,
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| 110 | owner);
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| 111 | }
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| 112 | return(0);
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| 113 | }
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