picosocks.c: improve fallback code

Author: barracuda156

picoquic/picosocks.c

@@ -448,7 +448,11 @@ void picoquic_socks_cmsg_parse(
                 }
             }
 #endif
-            else if ((cmsg->cmsg_type == IP_TOS || cmsg->cmsg_type == IP_RECVTOS) && cmsg->cmsg_len > 0) {
+            else if ((cmsg->cmsg_type == IP_TOS
+#ifdef IP_RECVTOS
+                || cmsg->cmsg_type == IP_RECVTOS
+#endif
+                ) && cmsg->cmsg_len > 0) {
                 if (received_ecn != NULL) {
                     *received_ecn = *((unsigned char*)CMSG_DATA(cmsg));
                 }
@@ -642,7 +646,13 @@ void picoquic_socks_cmsg_format(
 #else 
             /* The IP_PKTINFO structure is not defined on BSD */
             struct in_addr* pktinfo = (struct in_addr*)cmsg_format_header_return_data_ptr(msg, &last_cmsg,
-                &control_length, IPPROTO_IP, IP_SENDSRCADDR, sizeof(struct in_addr));
+                &control_length, IPPROTO_IP,
+#ifdef IP_SENDSRCADDR
+                IP_SENDSRCADDR
+#else
+                IP_RECVDSTADDR
+#endif
+                , sizeof(struct in_addr));
             if (pktinfo != NULL) {
                 pktinfo->s_addr = ((struct sockaddr_in*)addr_from)->sin_addr.s_addr;
             }