ipv4_from_ipv6: move to librb

[solanum.git] / librb / src / commio.c

diff --git a/librb/src/commio.c b/librb/src/commio.c
index 259b900d90ef523476b12218e79f4bf98b87e353..fde467c83213471869328b26235f8f258419208b 100644 (file)
--- a/librb/src/commio.c
+++ b/librb/src/commio.c
@@ -2095,7 +2095,6 @@ rb_setup_fd(rb_fde_t *F)
 }
 
 
-
 int
 rb_ignore_errno(int error)
 {
@@ -2242,7 +2241,7 @@ rb_send_fd_buf(rb_fde_t *xF, rb_fde_t **F, int count, void *data, size_t datasiz
        }
        return sendmsg(rb_get_fd(xF), &msg, MSG_NOSIGNAL);
 }
-#else
+#else /* defined(HAVE_SENDMSG) && !defined(WIN32) */
 #ifndef _WIN32
 int
 rb_recv_fd_buf(rb_fde_t *F, void *data, size_t datasize, rb_fde_t **xF, int nfds)
@@ -2257,5 +2256,38 @@ rb_send_fd_buf(rb_fde_t *xF, rb_fde_t **F, int count, void *data, size_t datasiz
        errno = ENOSYS;
        return -1;
 }
-#endif
-#endif
+#endif /* _WIN32 */
+#endif /* defined(HAVE_SENDMSG) && !defined(WIN32) */
+
+#ifdef RB_IPV6
+int
+rb_ipv4_from_ipv6(const struct sockaddr_in6 *restrict ip6, struct sockaddr_in *restrict ip4)
+{
+       int i;
+
+       if (!memcmp(ip6->sin6_addr.s6_addr, "\x20\x02", 2))
+       {
+               /* 6to4 and similar */
+               memcpy(&ip4->sin_addr, ip6->sin6_addr.s6_addr + 2, 4);
+       }
+       else if (!memcmp(ip6->sin6_addr.s6_addr, "\x20\x01\x00\x00", 4))
+       {
+               /* Teredo */
+               for (i = 0; i < 4; i++)
+                       ((uint8_t *)&ip4->sin_addr)[i] = 0xFF ^
+                               ip6->sin6_addr.s6_addr[12 + i];
+       }
+       else
+               return 0;
+       SET_SS_LEN(ip4, sizeof(struct sockaddr_in));
+       ip4->sin_family = AF_INET;
+       ip4->sin_port = 0;
+       return 1;
+}
+#else
+int
+rb_ipv4_from_ipv6(const struct sockaddr_in6 *restrict ip6, struct sockaddr_in *restrict ip4)
+{
+       return 0;
+}
+#endif /* RB_IPV6 */