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tunslip6: added some better clarification of errors when TUNSETIFF fails

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This commit is contained in:
Michael Richardson 2014-05-09 14:25:59 -04:00
parent f1433f7d5f
commit 11c3dcc622
1 changed files with 6 additions and 1 deletions
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7
tools/tunslip6.c
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@ -520,6 +520,7 @@ tun_alloc(char *dev, int tap)
int fd, err;
if( (fd = open("/dev/net/tun", O_RDWR)) < 0 ) {
perror("can not open /dev/net/tun");
return -1;
}
@ -536,8 +537,12 @@ tun_alloc(char *dev, int tap)
if((err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 ) {
close(fd);
fprintf(stderr, "can not tunsetiff to %s (flags=%08x): %s\n", dev, ifr.ifr_flags,
strerror(errno));
return err;
}
/* get resulting tunnel name */
strcpy(dev, ifr.ifr_name);
return fd;
}
@ -932,7 +937,7 @@ exit(1);
if(inslip == NULL) err(1, "main: fdopen");
tunfd = tun_alloc(tundev, tap);
if(tunfd == -1) err(1, "main: open");
if(tunfd == -1) err(1, "main: open /dev/tun");
if (timestamp) stamptime();
fprintf(stderr, "opened %s device ``/dev/%s''\n",
tap ? "tap" : "tun", tundev);