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Filter link-local IPv4 addresses in evutil_found_ifaddr()

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Fixes: #668
This commit is contained in:
Azat Khuzhin 2018-10-24 11:51:57 +03:00
parent 0ec12bc84c
commit 117dc92129
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1 changed files with 6 additions and 0 deletions
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6
evutil.c
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@ -599,6 +599,11 @@ static int have_checked_interfaces, had_ipv4_address, had_ipv6_address;
*/
#define EVUTIL_V4ADDR_IS_LOCALHOST(addr) (((addr)>>24) == 127)
/* Macro: True iff the IPv4 address 'addr', in host order, is link-local
* 169.254.0.0/16 (RFC3927)
*/
#define EVUTIL_V4ADDR_IS_LINKLOCAL(addr) (((addr) & 0xffff0000U) == 0xa9fe0000U)
/* Macro: True iff the IPv4 address 'addr', in host order, is a class D
* (multiclass) address.
*/
@ -615,6 +620,7 @@ evutil_found_ifaddr(const struct sockaddr *sa)
ev_uint32_t addr = ntohl(sin->sin_addr.s_addr);
if (addr == 0 ||
EVUTIL_V4ADDR_IS_LOCALHOST(addr) ||
EVUTIL_V4ADDR_IS_LINKLOCAL(addr) ||
EVUTIL_V4ADDR_IS_CLASSD(addr)) {
/* Not actually a usable external address. */
} else {