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#pragma once
#include "icmp.h"
struct icmp_client_incoming {
const uint8_t *data; // points to internal buffer
size_t length; // length of 'data'
int id, seqnum;
};
// Returns -1 on error with errno.
int icmp_client_open_socket(void);
// Only actual IPv4 addresses allowed. Sends data in 'data' with length 'length', and
// returns pointer to internal buffer with reply data. Buffer is invalidated on next
// call to the function.
// Returns {.data=NULL} on error with errno.
struct icmp_client_incoming icmp_client_communicate(
int sock, const char *ip_address,
int id, int seqnum,
const void *data, size_t length);
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