bool arp_table_search(Slirp *slirp, uint32_t ip_addr, uint8_t out_ethaddr[ETH_ALEN]) { const uint32_t broadcast_addr = ~slirp->vnetwork_mask.s_addr | slirp->vnetwork_addr.s_addr; ArpTable *arptbl = &slirp->arp_table; int i; DEBUG_CALL("arp_table_search"); DEBUG_ARG("ip = 0x%x", ip_addr); /* Check 0.0.0.0/8 invalid source-only addresses */ assert((ip_addr & htonl(~(0xf << 28))) != 0); /* If broadcast address */ if (ip_addr == 0xffffffff || ip_addr == broadcast_addr) { /* return Ethernet broadcast address */ memset(out_ethaddr, 0xff, ETH_ALEN); return 1; } for (i = 0; i < ARP_TABLE_SIZE; i++) { if (arptbl->table[i].ar_sip == ip_addr) { memcpy(out_ethaddr, arptbl->table[i].ar_sha, ETH_ALEN); DEBUG_ARGS((dfd, " found hw addr = %02x:%02x:%02x:%02x:%02x:%02x\n", out_ethaddr[0], out_ethaddr[1], out_ethaddr[2], out_ethaddr[3], out_ethaddr[4], out_ethaddr[5])); return 1; } } return 0; }