1 /* Convert struct addrinfo values to a string.
2 Copyright (C) 2016-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
19 #include <support/format_nss.h>
21 #include <arpa/inet.h>
25 #include <support/support.h>
26 #include <support/xmemstream.h>
29 socket_address_length (int family)
34 return sizeof (struct sockaddr_in);
36 return sizeof (struct sockaddr_in6);
43 format_ai_flags_1 (FILE *out, struct addrinfo *ai, int flag, const char *name,
46 if ((ai->ai_flags & flag) != 0)
47 fprintf (out, " %s", name);
48 *flags_printed |= flag;
52 format_ai_flags (FILE *out, struct addrinfo *ai)
57 if (ai->ai_flags != 0)
59 fprintf (out, "flags:");
60 int flags_printed = 0;
61 #define FLAG(flag) format_ai_flags_1 (out, ai, flag, #flag, &flags_printed)
64 FLAG (AI_NUMERICHOST);
70 FLAG (AI_NUMERICSERV);
72 int remaining = ai->ai_flags & ~flags_printed;
74 fprintf (out, " %08x", remaining);
78 /* Report flag mismatches within the list. */
79 int flags = ai->ai_flags;
84 if (ai->ai_flags != flags)
85 fprintf (out, "error: flags at %d: 0x%x expected, 0x%x actual\n",
86 index, flags, ai->ai_flags);
93 format_ai_canonname (FILE *out, struct addrinfo *ai)
97 if (ai->ai_canonname != NULL)
98 fprintf (out, "canonname: %s\n", ai->ai_canonname);
100 /* Report incorrectly set ai_canonname fields on subsequent list
106 if (ai->ai_canonname != NULL)
107 fprintf (out, "error: canonname set at %d: %s\n",
108 index, ai->ai_canonname);
115 format_ai_one (FILE *out, struct addrinfo *ai)
119 const char *type_str;
121 const char *proto_str;
124 switch (ai->ai_socktype)
136 snprintf (type_buf, sizeof (type_buf), "%d", ai->ai_socktype);
141 switch (ai->ai_protocol)
153 snprintf (proto_buf, sizeof (proto_buf), "%d", ai->ai_protocol);
154 proto_str = proto_buf;
156 fprintf (out, "address: %s/%s", type_str, proto_str);
160 if (ai->ai_addrlen != socket_address_length (ai->ai_family))
162 char *family = support_format_address_family (ai->ai_family);
163 fprintf (out, "error: invalid address length %d for %s\n",
164 ai->ai_addrlen, family);
173 switch (ai->ai_family)
177 struct sockaddr_in *sin = (struct sockaddr_in *) ai->ai_addr;
178 ret = inet_ntop (AF_INET, &sin->sin_addr, buf, sizeof (buf));
179 port = sin->sin_port;
184 struct sockaddr_in6 *sin = (struct sockaddr_in6 *) ai->ai_addr;
185 ret = inet_ntop (AF_INET6, &sin->sin6_addr, buf, sizeof (buf));
186 port = sin->sin6_port;
190 errno = EAFNOSUPPORT;
194 fprintf (out, "error: inet_top failed: %m\n");
196 fprintf (out, " %s %u\n", buf, ntohs (port));
200 /* Format all the addresses in one address family. */
202 format_ai_family (FILE *out, struct addrinfo *ai, int family)
206 if (ai->ai_family == family)
207 format_ai_one (out, ai);
213 support_format_addrinfo (struct addrinfo *ai, int ret)
215 int errno_copy = errno;
217 struct xmemstream mem;
218 xopen_memstream (&mem);
221 const char *errmsg = gai_strerror (ret);
222 if (strcmp (errmsg, "Unknown error") == 0)
223 fprintf (mem.out, "error: Unknown error %d\n", ret);
225 fprintf (mem.out, "error: %s\n", errmsg);
226 if (ret == EAI_SYSTEM)
229 fprintf (mem.out, "error: %m\n");
234 format_ai_flags (mem.out, ai);
235 format_ai_canonname (mem.out, ai);
236 format_ai_family (mem.out, ai, AF_INET);
237 format_ai_family (mem.out, ai, AF_INET6);
240 xfclose_memstream (&mem);