79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/*
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* SPDX-FileCopyrightText: 2022, Alejandro Colomar <alx@kernel.org>
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <netinet/in.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#ident "$Id$"
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#include "defines.h"
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#include "prototypes.h"
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#if !defined(INET_ADDRSTRLENMAX)
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#define INET_ADDRSTRLENMAX MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN)
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#endif
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/*
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* SYNOPSIS
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* const char *inet_sockaddr2str(const struct sockaddr *sa);
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*
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* DESCRIPTION
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* This function is similar to inet_ntop(3). It transforms an address
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* in 'struct in_addr' or 'struct in6_addr' form into a human-readable
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* string.
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*
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* It receives a sockaddr structure, which is simpler to pass after
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* receiving it from getaddrinfo(3). However, this function is not
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* reentrant, and like inet_ntoa(3), it uses an internal buffer, for
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* simplicity; anyway we're not in a multithreaded program, and it
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* doesn't contain any sensitive data, so it's fine to use static
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* storage here.
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*
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* RETURN VALUE
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* This function returns a pointer to a statically allocated buffer,
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* which subsequent calls will overwrite.
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*
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* On error, it returns NULL.
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*
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* ERRORS
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* EAFNOSUPPORT
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* The address family in sa->sa_family is not AF_INET or AF_INET6.
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*
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* CAVEATS
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* This function is not reentrant.
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*/
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const char *
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inet_sockaddr2str(const struct sockaddr *sa)
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{
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struct sockaddr_in *sin;
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struct sockaddr_in6 *sin6;
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static char buf[INET_ADDRSTRLENMAX];
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switch (sa->sa_family) {
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case AF_INET:
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sin = (struct sockaddr_in *) sa;
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inet_ntop(AF_INET, &sin->sin_addr, buf, NITEMS(buf));
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return buf;
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case AF_INET6:
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sin6 = (struct sockaddr_in6 *) sa;
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inet_ntop(AF_INET6, &sin6->sin6_addr, buf, NITEMS(buf));
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return buf;
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default:
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errno = EAFNOSUPPORT;
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return NULL;
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}
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}
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