A simple program for generating packages and sending packages

Steps:

• 1. Pack Mr

 

Define struct
Define struct Variables
Assign values to struct Variables

# Define flowcount 30 Struct netflow_header Baotou Structure { Unsigned short version; Unsigned short count; Unsigned int sysuptime; Unsigned int unix_seconds; Unsigned int unix_nanoseconds; Unsigned int flow_sequence_number; Unsigned char engine_type; Unsigned char engine_id; Unsigned short reserved; }; Struct Netflow_entry Payload Structure { Unsigned int src_ip; Unsigned int dst_ip; Unsigned int next_hop_ip; Unsigned short input_interface_index; Unsigned short output_interface_index; Unsigned int packets; Unsigned int bytes; Unsigned int start_time; Unsigned int end_time; Unsigned short src_port; Unsigned short dst_port; Unsigned char pad; Unsigned char flag; Unsigned char proto; Unsigned char TOS; Unsigned short src_as; Unsigned short dst_as; Unsigned char src_netmask_len; Unsigned char dst_netmask_len; Unsigned short padding; }; Struct Netflow_pkt Overall Package Structure { Struct netflow_header HDR; Baotou Struct netflow_entry entry [30]; Payload } Pkts;

• 2. Resend package

Establish socket,
Establish connection
Issue the previously generated package

Unsigned int gettickcount () { Struct TMS TM; Return (Unsigned INT) times (& TM ); } Unsigned int rand_long () { Unsigned int ip_addr, IP1, ip2, IP3, ip4; IP1 = rand () % 254 + 1; Ip2 = rand () % 254 + 1; IP3 = rand () % 254 + 1; Ip4 = rand () % 254 + 1; Ip_addr = (IP1 <24) + (ip2 <16) + (IP3 <8) + ip4; Return ip_addr; } Create_packet () Generate a package { Int I = 0; Int J = 0; Int K = 0; Unsigned int currentt; Int counts = flowcount; Int numbytes; Socklen_t socklen = sizeof (servaddr ); Pkts. HDR. Version = Htons (5 ); Pkts. HDR. Count = Htons (counts ); Currentt = Gettickcount () ; Pkts. HDR. sysuptime = htons (currentt-2000 ); Pkts. HDR. unix_seconds = htons (currentt/1000 ); Pkts. HDR. unix_nanoseconds = htons (currentt-Pkts. HDR. unix_seconds * 1000 ); Pkts. HDR. engine_id = (unsigned char) 11; Pkts. HDR. engine_type = (unsigned char) 1; Pkts. HDR. Reserved = (unsigned char) 1; For (I = 0; I <counts; I ++) { Pkts. Entry [I]. src_ip = htons (rand_long ()); Pkts. Entry [I]. dst_ip = htons (rand_long ()); Pkts. Entry [I]. next_hop_ip = htons (rand_long ()); Pkts. Entry [I]. input_interface_index = htons (RAND () % 3 + 1 ); Pkts. Entry [I]. output_interface_index = htons (RAND () % 3 + 1 ); Pkts. Entry [I]. packets = htons (RAND () % 1000 + 5 ); Pkts. Entry [I]. bytes = htons (RAND () % 2048 + 48 ); Pkts. Entry [I]. start_time = htons (currentt-1500 ); Pkts. Entry [I]. end_time = htons (currentt-100 ); Pkts. Entry [I]. src_port = Htons (RAND () % 65533 + 1 ); Pkts. Entry [I]. dst_port = Htons (RAND () % 65533 + 1 ); Pkts. Entry [I]. Pad = htons (1 ); Pkts. Entry [I]. Flag = htons (RAND () % 8129 ); If (counts % 2 = 0) Pkts. Entry [I]. proto = (unsigned char) 1; // LFC Changed Else If (counts % 3 = 0) Pkts. Entry [I]. proto = (unsigned char) 6; Else Pkts. Entry [I]. proto = (unsigned char) 17; Pkts. Entry [I]. TOS = (unsigned char) 1; Pkts. Entry [I]. src_as = htons (RAND () % 100 + 1 ); Pkts. Entry [I]. dst_as = htons (RAND () % 100 + 1 ); Pkts. Entry [I]. src_netmask_len = htons (24 ); Pkts. Entry [I]. dst_netmask_len = htons (24 ); Pkts. Entry [I]. Padding = htons (0 ); } }

Int clifd; Struct sockaddr_in servaddr, cliaddr; Send_packet (char * server_addr_string, unsigned int Server_port) packet sending Function { If (clifd = socket (af_inet, sock_dgram, 0) < 0) { Printf ("create socket error! /N "); Exit (1 ); } Bzero (& cliaddr, sizeof (cliaddr )); Cliaddr. sin_family = af_inet; Cliaddr. sin_addr.s_addr = htons (inaddr_any ); Cliaddr. sin_port = htons (0 ); Bzero (& servaddr, sizeof (servaddr )); Servaddr. sin_family = af_inet; Inet_aton (server_addr_string, & servaddr. sin_addr ); Servaddr. sin_port = htons (server_port ); If (numbytes = sendto (clifd, (char *) & Pkts, 24 + 48 * flowcoun T, 0, (struct sockaddr *) & Servaddr, socklen) =-1 ){ Printf ("error send! /N "); Printf ("Wait error: % s/n", strerror (errno )); Exit (1 ); } }

Int Main () Main Program { Create_packet (); Pack Mr Send_packet (str_dst_ip, dst_port); resend the packet }