+
+
+ /* check isakmp header length */
+ if (len < sizeof(temp_buffer)) {
+ plog(LLV_ERROR, LOCATION, (struct sockaddr *)&remote,
+ "packet shorter than isakmp header size.\n");
+ /* dummy receive */
+ if ((len = recvfrom(so_isakmp, (char *)temp_buffer, sizeof(temp_buffer),
+ 0, (struct sockaddr *)&remote, &remote_len)) < 0) {
+ plog(LLV_ERROR, LOCATION, NULL,
+ "failed to receive isakmp packet\n");
+ }
+ goto end;
+ }
+
+ /* reject if the size is toooo big */
+ if (ntohl(isakmp->len) > 0xffff) {
+ plog(LLV_ERROR, LOCATION, NULL,
+ "the length in the isakmp header is too big.\n");
+ if ((len = recvfrom(so_isakmp, (char *)temp_buffer, sizeof(temp_buffer),
+ 0, (struct sockaddr *)&remote, &remote_len)) < 0) {
+ plog(LLV_ERROR, LOCATION, NULL,
+ "failed to receive isakmp packet\n");
+ }
+ goto end;
+ }