diff options
| -rw-r--r-- | src/iface.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/src/iface.c b/src/iface.c index 4f132e4..1c2b55b 100644 --- a/src/iface.c +++ b/src/iface.c @@ -246,11 +246,16 @@ static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) { exit_bug("invalid mode"); } + iface->cleanup = true; + if (ifname) { - if (strncmp(ifname, type, 3) != 0) - exit_error("`%s' doesn't seem to be a %s device", ifname, type); + if (strlen(ifname) <= 3 || strncmp(ifname, type, 3) != 0) + exit_error("Invalid %s interface `%s'", type, ifname); strncat(dev_name, ifname, IFNAMSIZ-1); + + if (if_nametoindex(ifname)) + iface->cleanup = false; } else { strncat(dev_name, type, IFNAMSIZ-1); @@ -277,7 +282,15 @@ static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) { } } -static void cleanup_iface(UNUSED fastd_iface_t *iface) { +static void cleanup_iface(fastd_iface_t *iface) { + if (!iface->cleanup) + return; + + struct ifreq ifr = {}; + strncpy(ifr.ifr_name, iface->name, IFNAMSIZ-1); + + if (ioctl(ctx.ioctl_sock, SIOCIFDESTROY, &ifr) < 0) + pr_warn_errno("unable to destroy TUN/TAP interface"); } #else /* __OpenBSD__ */ |