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split into two files, added comments, fixed udp checksums?

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This commit is contained in:
jgeigerm
2015-07-02 20:24:20 -04:00
parent dcabbe3f42
commit 1fe54c8f05
2 changed files with 101 additions and 54 deletions
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43
watershell.h Normal file
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#ifndef WATERSHELL_H_
#define WATERSHELL_H_
/* BPF code generated with tcpdump -dd udp and port 12345
* used to filter incoming packets at the socket level
*/
struct sock_filter bpf_code[] = {
{ 0x28, 0, 0, 0x0000000c },
{ 0x15, 0, 6, 0x000086dd },
{ 0x30, 0, 0, 0x00000014 },
{ 0x15, 0, 15, 0x00000011 },
{ 0x28, 0, 0, 0x00000036 },
{ 0x15, 12, 0, 0x00003039 }, //5
{ 0x28, 0, 0, 0x00000038 },
{ 0x15, 10, 11, 0x00003039 }, //7
{ 0x15, 0, 10, 0x00000800 },
{ 0x30, 0, 0, 0x00000017 },
{ 0x15, 0, 8, 0x00000011 },
{ 0x28, 0, 0, 0x00000014 },
{ 0x45, 6, 0, 0x00001fff },
{ 0xb1, 0, 0, 0x0000000e },
{ 0x48, 0, 0, 0x0000000e },
{ 0x15, 2, 0, 0x00003039 }, //15
{ 0x48, 0, 0, 0x00000010 },
{ 0x15, 0, 1, 0x00003039 }, //17
{ 0x6, 0, 0, 0x0000ffff },
{ 0x6, 0, 0, 0x00000000 },
};
/* its a datagram inside a packet inside a frame!
* gotta be packed though!
*/
struct __attribute__((__packed__)) udpframe {
struct ethhdr ehdr;
struct iphdr ip;
struct udphdr udp;
unsigned char data[ETH_DATA_LEN - sizeof(struct udphdr) - sizeof(struct iphdr)];
};
void send_status(unsigned char *buf, int code);
void sigint(int signum);
void ip_checksum(struct iphdr *ip);
void udp_checksum(struct iphdr *ip, unsigned short *payload);
#endif