/* Upcalled by event.c when receive ready condition on the socket.
* Validates the ether and base headers, and g_opcode types. */
void
packetio_recv_handler(int fd, void *state)
{
uint16_t thisSeqnum;
/* Read into the global g_rxbuf, and save the length in a global */
g_rcvd_pkt_len = osl_read(fd, g_rxbuf, RXBUFSZ);
if (g_rcvd_pkt_len <= 0)
die("packetio_recv_handler: error on read: %s\n", strerror(errno));
if (g_rcvd_pkt_len < sizeof(topo_ether_header_t))
{
warn("packetio_recv_handler: runt frame (%d bytes < %d); ignoring\n",
g_rcvd_pkt_len, sizeof(topo_ether_header_t));
return;
}
/* We set up all the (macro-ized) global header pointers here.
* Actually, this could be done once, at process init time... */
g_ethernet_hdr = (topo_ether_header_t*)(g_rxbuf);
g_base_hdr = (topo_base_header_t*)(g_ethernet_hdr + 1);
g_discover_hdr = (topo_discover_header_t*)(g_base_hdr + 1);
g_hello_hdr = (topo_hello_header_t*)(g_base_hdr + 1);
g_qltlv_hdr = (topo_qltlv_header_t*)(g_base_hdr + 1);
DEBUG({printf("packetio: received a packet; len=%d ",g_rcvd_pkt_len);})
/* check Ethernet header */
if (g_ethernet_hdr->eh_ethertype != TOPO_ETHERTYPE)
/* Upcalled by event.c when receive ready condition on the socket.
* Validates the ether and base headers, and g_opcode types. */
void
packetio_recv_handler(int fd, void *state)
{
uint16_t thisSeqnum;
enum packet_verification_results pktValidity;
/* Read into the global g_rxbuf, and save the length in a global */
g_rcvd_pkt_len = osl_read(fd, g_rxbuf, RXBUFSZ);
if (g_rcvd_pkt_len <= 0)
die("packetio_recv_handler: error on read: %s\n", strerror(errno));
if (g_rcvd_pkt_len < sizeof(topo_ether_header_t))
{
warn("packetio_recv_handler: runt frame (" FMT_SIZET " bytes < " FMT_SIZET "); ignoring\n",
g_rcvd_pkt_len, sizeof(topo_ether_header_t));
return;
}
/* We set up all the (macro-ized) global header pointers here.
* Actually, this could be done once, at process init time... */
g_ethernet_hdr = (topo_ether_header_t*)(g_rxbuf);
g_base_hdr = (topo_base_header_t*)(g_ethernet_hdr + 1);
g_discover_hdr = (topo_discover_header_t*)(g_base_hdr + 1);
g_hello_hdr = (topo_hello_header_t*)(g_base_hdr + 1);
g_qltlv_hdr = (topo_qltlv_header_t*)(g_base_hdr + 1);
/* check Ethernet header */
if (g_ethernet_hdr->eh_ethertype != TOPO_ETHERTYPE)
{
DEBUG({dbgprintf("packetio: received a non-Topology packet ether-type=0x%0X, ignored...\n",g_ethernet_hdr->eh_ethertype);})
return;
