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#pragma once
#include "icmp.h"
// Returns -1 on error with errno.
int icmp_server_open_socket(void);
// Returns {.data=NULL} on error with errno.
// Receives only ECHO.
struct icmp_incoming icmp_server_receive(int sock);
// Returns -1 on error with errno.
int icmp_server_send_reply(
int sock, uint32_t addr,
int id, int seqnum,
const void *data, size_t length);
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