Attachment 298863 Details for Bug 438629 – tunctl source code

tunctl source code

tunctl.c (text/x-csrc), 3.27 KB, created by Dan Kenigsberg on 2008-03-23 15:39:15 UTC

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Creator: Dan Kenigsberg

Created: 2008-03-23 15:39:15 UTC

Size: 3.27 KB

patch

obsolete

>/* 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);
>}

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Attachments on bug 438629: 298862 | 298863 | 305372