int MAIN(flood, int argc, char** argv) {
int eth_fd = open("/Devices/Pcnet32/0", 1);
if(eth_fd == -1) {
printf("Error opening net interface\n");
return 0;
}
printf("flooding network\n");
char *str = "PASS | karc123as\r\n";
int header_size = buffer.payload_start - (u_int8_t*)&buffer;
int i;
for(i=0; i<6; i++) {
buffer.dst[i] = 0xff;
buffer.src[i] = 0xff;
}
buffer.type = cpu_to_net16(0x800);
buffer.version = 4;
buffer.ihl = 20/4;
buffer.tos = 0x0;
buffer.tot_len = cpu_to_net16(header_size + strlen(str) - 12 - 2);
buffer.frag_off = 0;
buffer.ttl = 0x40;
buffer.protocol = 0x6;
buffer.ip_dst = 0x0a0a0a0a;
buffer.ip_src = 0x0b0a0a0a;
buffer.tcp_sport = cpu_to_net16(41235);
buffer.tcp_dport = cpu_to_net16(21);
buffer.tcp_sn = cpu_to_net32(54335123);
buffer.tcp_ackSn = cpu_to_net32(67243514);
buffer.ack = 1;
buffer.doff = 5;
buffer.window = 40;
ip_checksum((struct ip_frame*)buffer.ip_frame);
buffer.tcp_check = ip_sum_calc(20 + strlen(str), (u_int16_t*)buffer.tcp_frame);
while(1) {
strcpy(buffer.payload, str);
int res;
printf("writing\n");
res = write(eth_fd, &buffer, (header_size + strlen(str)));
if(res == -1)
printf("error\n");
else
printf("ok\n");
}
}
/*
* This sends a keep alive message to the specified IP.
* It does not tag the packet with the Accelerator ID this
* prevents the keepalive messages from recreating dead sessions
* in remote Accelerators.
*/
void sendkeepalive
(__u32 saddr, __u16 source, __u32 seq,
__u32 daddr, __u16 dest, __u32 ack_seq){
char packet[BUFSIZE];
struct iphdr *iph = NULL;
struct tcphdr *tcph = NULL;
struct sockaddr_in sin, din;
__u16 tcplen;
memset(packet, 0, BUFSIZE);
sin.sin_family = AF_INET;
din.sin_family = AF_INET;
sin.sin_port = source;
din.sin_port = dest;
sin.sin_addr.s_addr = saddr;
din.sin_addr.s_addr = daddr;
iph = (struct iphdr *)packet;
iph->ihl = 5; // IP header length.
iph->version = 4; // IP version 4.
iph->tos = 0; // No TOS.
iph->tot_len=htons(sizeof(struct iphdr) + sizeof(struct tcphdr)); // L3 + L4 header length.
iph->id = 0; // What?
iph->frag_off = 0; // No fragmenting.
iph->ttl = 64; // Set a TTL.
iph->protocol = IPPROTO_TCP; // TCP protocol.
iph->check = 0; // No IP checksum yet.
iph->saddr = saddr; // Source IP.
iph->daddr = daddr; // Dest IP.
tcph = (struct tcphdr *) (((u_int32_t *)iph) + iph->ihl);
tcph->check = 0; // No TCP checksum yet.
tcph->source = source; // Source TCP Port.
tcph->dest = dest; // Destination TCP Port.
tcph->seq = htonl(seq - 1); // Current SEQ minus one is used for TCP keepalives.
tcph->ack_seq = htonl( ack_seq - 1); // Ummm not sure yet.
tcph->res1 = 0; // Not sure.
tcph->doff = 5; // TCP Offset. At least 5 if there are no TCP options.
tcph->fin = 0; // FIN flag.
tcph->syn = 0; // SYN flag.
tcph->rst = 0; // RST flag.
tcph->psh = 0; // PSH flag.
tcph->ack = 1; // ACK flag.
tcph->urg = 0; // URG flag.
__set_tcp_option((__u8 *)iph,32,6,localID); // Add the Accelerator ID to this packet.
tcplen = ntohs(iph->tot_len) - iph->ihl*4;
tcph->check = 0;
tcph->check = tcp_sum_calc(tcplen,
(unsigned short *)&iph->saddr,
(unsigned short *)&iph->daddr,
(unsigned short *)tcph);
iph->check = 0;
iph->check = ip_sum_calc(iph->ihl*4,
(unsigned short *)iph);
if(sendto(rawsock, packet, ntohs(iph->tot_len), 0, (struct sockaddr *)&din, sizeof(din)) < 0){
printf("sendto() error\n");
}
return;
}
/*
* This sends a keep alive message to the specified IP.
* It does not tag the packet with the Accelerator ID this
* prevents the keepalive messages from recreating dead sessions
* in remote Accelerators.
*/
void sendkeepalive
(__u32 saddr, __u16 source, __u32 seq,
__u32 daddr, __u16 dest, __u32 ack_seq){
char packet[BUFSIZE];
struct iphdr *iph = NULL;
struct tcphdr *tcph = NULL;
//struct sockaddr_in sin;
struct sockaddr_in din;
__u16 tcplen;
memset(packet, 0, BUFSIZE);
//sin.sin_family = AF_INET;
din.sin_family = AF_INET;
//sin.sin_port = source;
din.sin_port = dest;
//sin.sin_addr.s_addr = saddr;
din.sin_addr.s_addr = daddr;
iph = (struct iphdr *)packet;
iph->ihl = 5; // IP header length.
iph->version = 4; // IP version 4.
iph->tos = 0; // No TOS.
iph->tot_len=htons(sizeof(struct iphdr) + sizeof(struct tcphdr)); // L3 + L4 header length.
iph->id = 0; // What?
iph->frag_off = 0; // No fragmenting.
iph->ttl = 64; // Set a TTL.
iph->protocol = IPPROTO_TCP; // TCP protocol.
iph->check = 0; // No IP checksum yet.
iph->saddr = saddr; // Source IP.
iph->daddr = daddr; // Dest IP.
tcph = (struct tcphdr *) (((u_int32_t *)iph) + iph->ihl);
tcph->check = 0; // No TCP checksum yet.
tcph->source = source; // Source TCP Port.
tcph->dest = dest; // Destination TCP Port.
tcph->seq = htonl(seq - 1); // Current SEQ minus one is used for TCP keepalives.
tcph->ack_seq = htonl( ack_seq - 1); // Ummm not sure yet.
tcph->res1 = 0; // Not sure.
tcph->doff = 5; // TCP Offset. At least 5 if there are no TCP options.
tcph->fin = 0; // FIN flag.
tcph->syn = 0; // SYN flag.
tcph->rst = 0; // RST flag.
tcph->psh = 0; // PSH flag.
tcph->ack = 1; // ACK flag.
tcph->urg = 0; // URG flag.
if (__set_tcp_option((__u8 *)iph,32,3,2) == -1) { // Add the Accelerator ID to this packet.
LOGDEBUG(lc_sesman, "Sessioncleanup: Cannot add accelerator ID, sessioncleanup.c, IP datagram ID %x, current value of TCP doff %d",ntohs(iph->id), tcph->doff);
} else {
unsigned char *tcpdata = (unsigned char *) tcph + tcph->doff * 4; // Find starting location of the TCP data.
pOpennopHeader oh = (pOpennopHeader) tcpdata;
oh->opennopID = localID;
oh->seqNo = 0;
oh->compression = 0;
oh->deduplication = 0;
oh->reasonForNoOptimization = NOT_RELEVANT;
oh->queuenum = 0;
oh->pattern = OPENNOP_PATTERN;
iph->tot_len = htons(ntohs(iph->tot_len)+sizeof(OpennopHeader));
}
tcplen = ntohs(iph->tot_len) - iph->ihl*4;
tcph->check = 0;
tcph->check = tcp_sum_calc(tcplen,
(unsigned short *)&iph->saddr,
(unsigned short *)&iph->daddr,
(unsigned short *)tcph);
iph->check = 0;
iph->check = ip_sum_calc(iph->ihl*4,
(unsigned short *)iph);
if(sendto(rawsock, packet, ntohs(iph->tot_len), 0, (struct sockaddr *)&din, sizeof(din)) < 0){
printf("sendto() error\n");
}
return;
}
