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Embedded Linux Learning

inet_ntop

inet_ntop()¶

Purpose¶

inet_ntop() converts a binary network address to a printable string.

It is useful for logging peer IP addresses after accept().

#include <arpa/inet.h>

Prototype¶

const char *inet_ntop(int af, const void *src,
                      char *dst, socklen_t size);

Minimal Example¶

char ip[INET_ADDRSTRLEN];

if (!inet_ntop(AF_INET, &peer.sin_addr, ip, sizeof(ip))) {
    perror("inet_ntop");
    return -1;
}

Common Pitfalls¶

Using a buffer that is too small.
Passing the wrong address family.
Passing the address of the wrong field inside sockaddr_in.