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socket-enhancer
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Add support for unique local addresses

This commit is contained in:
Peter H. Jin 2021-06-16 17:50:23 -05:00
parent 1dd53e792d
commit 785e506850
1 changed files with 12 additions and 0 deletions
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12
socket-enhancer.c
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@ -46,9 +46,11 @@ struct socket_enhancer_config {
uint8_t has_v6_default:1;
uint8_t has_v6_v4mapv6:1;
uint8_t has_v6_linklocal:1;
uint8_t has_v6_uniquelocal:1;
struct ipv6_with_scope ipv6_default;
struct ipv6_with_scope ipv6_v4mapv6;
struct ipv6_with_scope ipv6_linklocal;
struct ipv6_with_scope ipv6_uniquelocal;
};
static struct socket_enhancer_config *global_config = NULL;
static void parse_v4(const char *addr, struct in_addr *result) {
@ -114,6 +116,10 @@ static void socket_enhancer_init(void) {
parse_v6(value, &temp_config->ipv6_v4mapv6);
temp_config->has_v6_v4mapv6 = 1;
break;
case 0x76367571: /* "v6uq" */
parse_v6(value, &temp_config->ipv6_uniquelocal);
temp_config->has_v6_uniquelocal = 1;
break;
case 0x7636756c: /* "v6ul" */
option_numeric_value = strtoul(value, NULL, 0);
if (option_numeric_value > 3) goto out_of_range;
@ -237,6 +243,12 @@ int connect(int fd, const struct sockaddr *addr_, socklen_t len_) {
tmp_addr.address.s6_addr32[3] = *(uint32_t *) &config->ipv4_default;
bind_addr = &tmp_addr;
}
} else if ((new_addr.ipv6_addr.sin6_addr.s6_addr[0] & 0xfe) == 0xfc) {
if (config->has_v6_uniquelocal) {
bind_addr = &config->ipv6_uniquelocal;
} else if (config->has_v6_default) {
bind_addr = &config->ipv6_default;
}
} else {
if (config->has_v6_default) {
bind_addr = &config->ipv6_default;