static void assert_lengths(libnet_t* l, int ip_len, int ip_ihl, int payload_s) { uint8_t* pkt1 = NULL; uint32_t pkt1_sz = 0; struct libnet_ipv4_hdr* h1; uint8_t* payload = NULL; int r = libnet_pblock_coalesce(l, &pkt1, &pkt1_sz); assert(r >= 0); print_pblocks(l); libnet_diag_dump_hex(pkt1, 14, 1, stdout); libnet_diag_dump_hex(pkt1+14, pkt1_sz-14, 1, stdout); // check ip IHL value, total ip pkt length, and options value h1 = (struct libnet_ipv4_hdr*) (pkt1+14); assert_eq(h1->ip_hl, ip_ihl); assert_eq(ntohs(h1->ip_len), ip_len); payload = ((uint8_t*) h1) + ip_ihl * 4; if(payload_s > 0) { assert(payload[0] == (uint8_t)'\x99'); assert(payload[payload_s-1] == (uint8_t)'\x99'); } }
int main(int argc, char *argv[]) { libnet_t *l; int r; char *device = "eth0"; struct libnet_ether_addr *mac_address; struct in6_addr src_ip; struct libnet_in6_addr dst_ip; char errbuf[LIBNET_ERRBUF_SIZE]; libnet_ptag_t icmp_ptag = 0; libnet_ptag_t ipv6_ptag = 0; char payload[24] = { 0 }; memset(&src_ip, 0x66, sizeof(src_ip)); l = libnet_init( LIBNET_RAW6, device, errbuf); assert(l); mac_address = libnet_get_hwaddr(l); assert(mac_address); dst_ip = libnet_name2addr6(l, "::1" /* BCAST_ADDR - defined where? */, LIBNET_DONT_RESOLVE); memcpy(payload,src_ip.s6_addr,16); payload[16] = 2; /* 2 for Target Link-layer Address */ payload[17] = 1; /* The length of the option */ memcpy(payload+18,mac_address->ether_addr_octet, 6); /* 0x2000: RSO */ icmp_ptag = libnet_build_icmpv4_echo( 136,0,0,0x2000,0, (uint8_t *)payload,sizeof(payload), l, LIBNET_PTAG_INITIALIZER); assert(icmp_ptag); ipv6_ptag = libnet_build_ipv6( 0, 0, LIBNET_ICMPV6_H + sizeof(payload), /* ICMPV6_H == ICMPV4_H, luckily */ IPPROTO_ICMP6, 255, *(struct libnet_in6_addr*)&src_ip, dst_ip, NULL, 0, l, 0); assert(icmp_ptag); print_pblocks(l); { uint8_t* pkt1 = NULL; uint32_t pkt1_sz = 0; r = libnet_pblock_coalesce(l, &pkt1, &pkt1_sz); assert(r >= 0); libnet_diag_dump_hex(pkt1, LIBNET_IPV6_H, 0, stdout); libnet_diag_dump_hex(pkt1+LIBNET_IPV6_H, pkt1_sz-LIBNET_IPV6_H, 0, stdout); free(pkt1); pkt1 = NULL; } r = libnet_write(l); assert(r >= 0); return (EXIT_SUCCESS); }