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/* Convert struct addrinfo values to a string.
Copyright (C) 2016-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <support/format_nss.h>
#include <arpa/inet.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <support/support.h>
#include <support/xmemstream.h>
static size_t
socket_address_length (int family)
{
switch (family)
{
case AF_INET:
return sizeof (struct sockaddr_in);
case AF_INET6:
return sizeof (struct sockaddr_in6);
default:
return -1;
}
}
static void
format_ai_flags_1 (FILE *out, struct addrinfo *ai, int flag, const char *name,
int * flags_printed)
{
if ((ai->ai_flags & flag) != 0)
fprintf (out, " %s", name);
*flags_printed |= flag;
}
static void
format_ai_flags (FILE *out, struct addrinfo *ai)
{
if (ai == NULL)
return;
if (ai->ai_flags != 0)
{
fprintf (out, "flags:");
int flags_printed = 0;
#define FLAG(flag) format_ai_flags_1 (out, ai, flag, #flag, &flags_printed)
FLAG (AI_PASSIVE);
FLAG (AI_CANONNAME);
FLAG (AI_NUMERICHOST);
FLAG (AI_V4MAPPED);
FLAG (AI_ALL);
FLAG (AI_ADDRCONFIG);
FLAG (AI_IDN);
FLAG (AI_CANONIDN);
FLAG (AI_NUMERICSERV);
#undef FLAG
int remaining = ai->ai_flags & ~flags_printed;
if (remaining != 0)
fprintf (out, " %08x", remaining);
fprintf (out, "\n");
}
/* Report flag mismatches within the list. */
int flags = ai->ai_flags;
int index = 1;
ai = ai->ai_next;
while (ai != NULL)
{
if (ai->ai_flags != flags)
fprintf (out, "error: flags at %d: 0x%x expected, 0x%x actual\n",
index, flags, ai->ai_flags);
ai = ai->ai_next;
++index;
}
}
static void
format_ai_canonname (FILE *out, struct addrinfo *ai)
{
if (ai == NULL)
return;
if (ai->ai_canonname != NULL)
fprintf (out, "canonname: %s\n", ai->ai_canonname);
/* Report incorrectly set ai_canonname fields on subsequent list
entries. */
int index = 1;
ai = ai->ai_next;
while (ai != NULL)
{
if (ai->ai_canonname != NULL)
fprintf (out, "error: canonname set at %d: %s\n",
index, ai->ai_canonname);
ai = ai->ai_next;
++index;
}
}
static void
format_ai_one (FILE *out, struct addrinfo *ai)
{
{
char type_buf[32];
const char *type_str;
char proto_buf[32];
const char *proto_str;
/* ai_socktype */
switch (ai->ai_socktype)
{
case SOCK_RAW:
type_str = "RAW";
break;
case SOCK_DGRAM:
type_str = "DGRAM";
break;
case SOCK_STREAM:
type_str = "STREAM";
break;
default:
snprintf (type_buf, sizeof (type_buf), "%d", ai->ai_socktype);
type_str = type_buf;
}
/* ai_protocol */
switch (ai->ai_protocol)
{
case IPPROTO_IP:
proto_str = "IP";
break;
case IPPROTO_UDP:
proto_str = "UDP";
break;
case IPPROTO_TCP:
proto_str = "TCP";
break;
default:
snprintf (proto_buf, sizeof (proto_buf), "%d", ai->ai_protocol);
proto_str = proto_buf;
}
fprintf (out, "address: %s/%s", type_str, proto_str);
}
/* ai_addrlen */
if (ai->ai_addrlen != socket_address_length (ai->ai_family))
{
char *family = support_format_address_family (ai->ai_family);
fprintf (out, "error: invalid address length %d for %s\n",
ai->ai_addrlen, family);
free (family);
}
/* ai_addr */
{
char buf[128];
uint16_t port;
const char *ret;
switch (ai->ai_family)
{
case AF_INET:
{
struct sockaddr_in *sin = (struct sockaddr_in *) ai->ai_addr;
ret = inet_ntop (AF_INET, &sin->sin_addr, buf, sizeof (buf));
port = sin->sin_port;
}
break;
case AF_INET6:
{
struct sockaddr_in6 *sin = (struct sockaddr_in6 *) ai->ai_addr;
ret = inet_ntop (AF_INET6, &sin->sin6_addr, buf, sizeof (buf));
port = sin->sin6_port;
}
break;
default:
errno = EAFNOSUPPORT;
ret = NULL;
}
if (ret == NULL)
fprintf (out, "error: inet_top failed: %m\n");
else
fprintf (out, " %s %u\n", buf, ntohs (port));
}
}
/* Format all the addresses in one address family. */
static void
format_ai_family (FILE *out, struct addrinfo *ai, int family)
{
while (ai)
{
if (ai->ai_family == family)
format_ai_one (out, ai);
ai = ai->ai_next;
}
}
char *
support_format_addrinfo (struct addrinfo *ai, int ret)
{
int errno_copy = errno;
struct xmemstream mem;
xopen_memstream (&mem);
if (ret != 0)
{
const char *errmsg = gai_strerror (ret);
if (strcmp (errmsg, "Unknown error") == 0)
fprintf (mem.out, "error: Unknown error %d\n", ret);
else
fprintf (mem.out, "error: %s\n", errmsg);
if (ret == EAI_SYSTEM)
{
errno = errno_copy;
fprintf (mem.out, "error: %m\n");
}
}
else
{
format_ai_flags (mem.out, ai);
format_ai_canonname (mem.out, ai);
format_ai_family (mem.out, ai, AF_INET);
format_ai_family (mem.out, ai, AF_INET6);
}
xfclose_memstream (&mem);
return mem.buffer;
}
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