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iface: score binds

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Choose the best fit for iface ip addresses by scoring the
unsorted results from getifaddrs()
This commit is contained in:
Andy Green 2021-07-20 06:17:13 +01:00
parent c11311ff5a
commit 5ddb03d146
2 changed files with 46 additions and 19 deletions
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14
lib/core-net/network.c
View file

@ -260,6 +260,7 @@ lws_socket_bind(struct lws_vhost *vhost, struct lws *wsi,
n = sizeof(struct sockaddr_in6);
memset(&serv_addr6, 0, sizeof(serv_addr6));
serv_addr6.sin6_family = AF_INET6;
if (iface) {
m = interface_to_sa(vhost, iface,
(struct sockaddr_in *)v, (unsigned int)n, 1);
@ -273,16 +274,11 @@ lws_socket_bind(struct lws_vhost *vhost, struct lws *wsi,
iface);
return m;
}
if (serv_addr6.sin6_family == AF_INET6)
serv_addr6.sin6_scope_id = (unsigned int)
lws_get_addr_scope(wsi, iface);
} else
serv_addr6.sin6_family = AF_INET6;
serv_addr6.sin6_scope_id = (unsigned int)htonl((uint32_t)
lws_get_addr_scope(wsi, iface));
}
if (serv_addr6.sin6_family == AF_INET6)
serv_addr6.sin6_port = (uint16_t)htons((uint16_t)port);
else
((struct sockaddr_in *)v)->sin_port = (uint16_t)htons((uint16_t)port);
serv_addr6.sin6_port = (uint16_t)htons((uint16_t)port);
break;
#endif

51
lib/plat/unix/unix-sockets.c
View file

@ -277,6 +277,14 @@ lws_plat_set_socket_options_ip(lws_sockfd_type fd, uint8_t pri, int lws_flags)
/* cast a struct sockaddr_in6 * into addr for ipv6 */
enum {
IP_SCORE_NONE,
IP_SCORE_NONNATIVE,
IP_SCORE_IPV6_SCOPE_BASE,
/* ipv6 scopes */
IP_SCORE_GLOBAL_NATIVE = 18
};
int
lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
size_t addrlen)
@ -285,8 +293,11 @@ lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
struct ifaddrs *ifr;
struct ifaddrs *ifc;
#ifdef LWS_WITH_IPV6
#if defined(LWS_WITH_IPV6)
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
unsigned long sco = IP_SCORE_NONE;
unsigned long ts;
const uint8_t *p;
#endif
if (getifaddrs(&ifr)) {
@ -294,7 +305,7 @@ lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
return LWS_ITOSA_USABLE;
}
for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
for (ifc = ifr; ifc != NULL; ifc = ifc->ifa_next) {
if (!ifc->ifa_addr || !ifc->ifa_name)
continue;
@ -309,13 +320,19 @@ lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
#if defined(AF_PACKET)
case AF_PACKET:
/* interface exists but is not usable */
rc = LWS_ITOSA_NOT_USABLE;
if (rc == LWS_ITOSA_NOT_EXIST)
rc = LWS_ITOSA_NOT_USABLE;
continue;
#endif
case AF_INET:
#ifdef LWS_WITH_IPV6
#if defined(LWS_WITH_IPV6)
if (ipv6) {
/* any existing solution is better than this */
if (sco != IP_SCORE_NONE)
break;
sco = IP_SCORE_NONNATIVE;
rc = LWS_ITOSA_USABLE;
/* map IPv4 to IPv6 */
memset((char *)&addr6->sin6_addr, 0,
sizeof(struct in6_addr));
@ -325,23 +342,37 @@ lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
&((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
sizeof(struct in_addr));
lwsl_debug("%s: uplevelling ipv4 bind to ipv6\n", __func__);
} else
break;
}
sco = IP_SCORE_GLOBAL_NATIVE;
#endif
memcpy(addr,
(struct sockaddr_in *)ifc->ifa_addr,
rc = LWS_ITOSA_USABLE;
memcpy(addr, (struct sockaddr_in *)ifc->ifa_addr,
sizeof(struct sockaddr_in));
break;
#ifdef LWS_WITH_IPV6
#if defined(LWS_WITH_IPV6)
case AF_INET6:
p = (const uint8_t *)
&((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr;
ts = IP_SCORE_IPV6_SCOPE_BASE;
if (p[0] == 0xff)
ts = (unsigned long)(IP_SCORE_IPV6_SCOPE_BASE + (p[1] & 0xf));
if (sco >= ts)
break;
sco = ts;
rc = LWS_ITOSA_USABLE;
memcpy(&addr6->sin6_addr,
&((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
&((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
sizeof(struct in6_addr));
break;
#endif
default:
continue;
}
rc = LWS_ITOSA_USABLE;
}
freeifaddrs(ifr);