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Add helper function tun_uses_header() 

Remove code duplication and hide some ifdefs
This commit is contained in:
Erik Ekman 2020-07-03 17:06:14 +02:00
parent 07b2978326
commit d8f3ac8971
1 changed files with 11 additions and 17 deletions
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28
src/tun.c
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@ -507,20 +507,24 @@ read_tun(int tun_fd, char *buf, size_t len)
}
}
#else
int
write_tun(int tun_fd, char *data, size_t len)
static int
tun_uses_header(void)
{
#if defined (FREEBSD) || defined (NETBSD)
/* FreeBSD/NetBSD has no header */
int header = 0;
return 0;
#elif defined (DARWIN)
/* Darwin tun has no header, Darwin utun does */
int header = !strncmp(if_name, "utun", 4);
return !strncmp(if_name, "utun", 4);
#else /* LINUX/OPENBSD */
int header = 1;
return 1;
#endif
}
if (!header) {
int
write_tun(int tun_fd, char *data, size_t len)
{
if (!tun_uses_header()) {
data += 4;
len -= 4;
} else {
@ -551,17 +555,7 @@ write_tun(int tun_fd, char *data, size_t len)
ssize_t
read_tun(int tun_fd, char *buf, size_t len)
{
#if defined (FREEBSD) || defined (NETBSD)
/* FreeBSD/NetBSD has no header */
int header = 0;
#elif defined (DARWIN)
/* Darwin tun has no header, Darwin utun does */
int header = !strncmp(if_name, "utun", 4);
#else /* LINUX/OPENBSD */
int header = 1;
#endif
if (!header) {
if (!tun_uses_header()) {
int bytes;
memset(buf, 0, 4);