-#ifdef CONFIG_MCAST_TFTP
-/*
- * Credits: atftp project.
- */
-
-/*
- * Pick up BcastAddr, Port, and whether I am [now] the master-client.
- * Frame:
- * +-------+-----------+---+-------~~-------+---+
- * | opc | multicast | 0 | addr, port, mc | 0 |
- * +-------+-----------+---+-------~~-------+---+
- * The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
- * I am the new master-client so must send ACKs to DataBlocks. If I am not
- * master-client, I'm a passive client, gathering what DataBlocks I may and
- * making note of which ones I got in my bitmask.
- * In theory, I never go from master->passive..
- * .. this comes in with pkt already pointing just past opc
- */
-static void parse_multicast_oack(char *pkt, int len)
-{
- int i;
- struct in_addr addr;
- char *mc_adr;
- char *port;
- char *mc;
-
- mc_adr = NULL;
- port = NULL;
- mc = NULL;
- /* march along looking for 'multicast\0', which has to start at least
- * 14 bytes back from the end.
- */
- for (i = 0; i < len - 14; i++)
- if (strcmp(pkt + i, "multicast") == 0)
- break;
- if (i >= (len - 14)) /* non-Multicast OACK, ign. */
- return;
-
- i += 10; /* strlen multicast */
- mc_adr = pkt + i;
- for (; i < len; i++) {
- if (*(pkt + i) == ',') {
- *(pkt + i) = '\0';
- if (port) {
- mc = pkt + i + 1;
- break;
- } else {
- port = pkt + i + 1;
- }
- }
- }
- if (!port || !mc_adr || !mc)
- return;
- if (tftp_mcast_active && tftp_mcast_master_client) {
- printf("I got a OACK as master Client, WRONG!\n");
- return;
- }
- /* ..I now accept packets destined for this MCAST addr, port */
- if (!tftp_mcast_active) {
- if (tftp_mcast_bitmap) {
- printf("Internal failure! no mcast.\n");
- free(tftp_mcast_bitmap);
- tftp_mcast_bitmap = NULL;
- tftp_mcast_disabled = 1;
- return;
- }
- /* I malloc instead of pre-declare; so that if the file ends
- * up being too big for this bitmap I can retry
- */
- tftp_mcast_bitmap = malloc(tftp_mcast_bitmap_size);
- if (!tftp_mcast_bitmap) {
- printf("No bitmap, no multicast. Sorry.\n");
- tftp_mcast_disabled = 1;
- return;
- }
- memset(tftp_mcast_bitmap, 0, tftp_mcast_bitmap_size);
- tftp_mcast_prev_hole = 0;
- tftp_mcast_active = 1;
- }
- addr = string_to_ip(mc_adr);
- if (net_mcast_addr.s_addr != addr.s_addr) {
- if (net_mcast_addr.s_addr)
- eth_mcast_join(net_mcast_addr, 0);
- net_mcast_addr = addr;
- if (eth_mcast_join(net_mcast_addr, 1)) {
- printf("Fail to set mcast, revert to TFTP\n");
- tftp_mcast_disabled = 1;
- mcast_cleanup();
- net_start_again();
- }
- }
- tftp_mcast_master_client = simple_strtoul((char *)mc, NULL, 10);
- tftp_mcast_port = (unsigned short)simple_strtoul(port, NULL, 10);
- printf("Multicast: %s:%d [%d]\n", mc_adr, tftp_mcast_port,
- tftp_mcast_master_client);
- return;
-}
-
-#endif /* Multicast TFTP */