1 | /* Convert struct addrinfo values to a string. |
2 | Copyright (C) 2016-2017 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
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. |
9 | |
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. |
14 | |
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 | <http://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <support/format_nss.h> |
20 | |
21 | #include <arpa/inet.h> |
22 | #include <errno.h> |
23 | #include <stdio.h> |
24 | #include <support/support.h> |
25 | #include <support/xmemstream.h> |
26 | |
27 | static size_t |
28 | socket_address_length (int family) |
29 | { |
30 | switch (family) |
31 | { |
32 | case AF_INET: |
33 | return sizeof (struct sockaddr_in); |
34 | case AF_INET6: |
35 | return sizeof (struct sockaddr_in6); |
36 | default: |
37 | return -1; |
38 | } |
39 | } |
40 | |
41 | static void |
42 | format_ai_flags_1 (FILE *out, struct addrinfo *ai, int flag, const char *name, |
43 | int * flags_printed) |
44 | { |
45 | if ((ai->ai_flags & flag) != 0) |
46 | fprintf (out, " %s" , name); |
47 | *flags_printed |= flag; |
48 | } |
49 | |
50 | static void |
51 | format_ai_flags (FILE *out, struct addrinfo *ai) |
52 | { |
53 | if (ai == NULL) |
54 | return; |
55 | |
56 | if (ai->ai_flags != 0) |
57 | { |
58 | fprintf (out, "flags:" ); |
59 | int flags_printed = 0; |
60 | #define FLAG(flag) format_ai_flags_1 (out, ai, flag, #flag, &flags_printed) |
61 | FLAG (AI_PASSIVE); |
62 | FLAG (AI_CANONNAME); |
63 | FLAG (AI_NUMERICHOST); |
64 | FLAG (AI_V4MAPPED); |
65 | FLAG (AI_ALL); |
66 | FLAG (AI_ADDRCONFIG); |
67 | FLAG (AI_IDN); |
68 | FLAG (AI_CANONIDN); |
69 | FLAG (AI_IDN_ALLOW_UNASSIGNED); |
70 | FLAG (AI_IDN_USE_STD3_ASCII_RULES); |
71 | FLAG (AI_NUMERICSERV); |
72 | #undef FLAG |
73 | int remaining = ai->ai_flags & ~flags_printed; |
74 | if (remaining != 0) |
75 | fprintf (out, " %08x" , remaining); |
76 | fprintf (out, "\n" ); |
77 | } |
78 | |
79 | /* Report flag mismatches within the list. */ |
80 | int flags = ai->ai_flags; |
81 | int index = 1; |
82 | ai = ai->ai_next; |
83 | while (ai != NULL) |
84 | { |
85 | if (ai->ai_flags != flags) |
86 | fprintf (out, "error: flags at %d: 0x%x expected, 0x%x actual\n" , |
87 | index, flags, ai->ai_flags); |
88 | ai = ai->ai_next; |
89 | ++index; |
90 | } |
91 | } |
92 | |
93 | static void |
94 | format_ai_canonname (FILE *out, struct addrinfo *ai) |
95 | { |
96 | if (ai == NULL) |
97 | return; |
98 | if (ai->ai_canonname != NULL) |
99 | fprintf (out, "canonname: %s\n" , ai->ai_canonname); |
100 | |
101 | /* Report incorrectly set ai_canonname fields on subsequent list |
102 | entries. */ |
103 | int index = 1; |
104 | ai = ai->ai_next; |
105 | while (ai != NULL) |
106 | { |
107 | if (ai->ai_canonname != NULL) |
108 | fprintf (out, "error: canonname set at %d: %s\n" , |
109 | index, ai->ai_canonname); |
110 | ai = ai->ai_next; |
111 | ++index; |
112 | } |
113 | } |
114 | |
115 | static void |
116 | format_ai_one (FILE *out, struct addrinfo *ai) |
117 | { |
118 | { |
119 | char type_buf[32]; |
120 | const char *type_str; |
121 | char proto_buf[32]; |
122 | const char *proto_str; |
123 | |
124 | /* ai_socktype */ |
125 | switch (ai->ai_socktype) |
126 | { |
127 | case SOCK_RAW: |
128 | type_str = "RAW" ; |
129 | break; |
130 | case SOCK_DGRAM: |
131 | type_str = "DGRAM" ; |
132 | break; |
133 | case SOCK_STREAM: |
134 | type_str = "STREAM" ; |
135 | break; |
136 | default: |
137 | snprintf (type_buf, sizeof (type_buf), "%d" , ai->ai_socktype); |
138 | type_str = type_buf; |
139 | } |
140 | |
141 | /* ai_protocol */ |
142 | switch (ai->ai_protocol) |
143 | { |
144 | case IPPROTO_IP: |
145 | proto_str = "IP" ; |
146 | break; |
147 | case IPPROTO_UDP: |
148 | proto_str = "UDP" ; |
149 | break; |
150 | case IPPROTO_TCP: |
151 | proto_str = "TCP" ; |
152 | break; |
153 | default: |
154 | snprintf (proto_buf, sizeof (proto_buf), "%d" , ai->ai_protocol); |
155 | proto_str = proto_buf; |
156 | } |
157 | fprintf (out, "address: %s/%s" , type_str, proto_str); |
158 | } |
159 | |
160 | /* ai_addrlen */ |
161 | if (ai->ai_addrlen != socket_address_length (ai->ai_family)) |
162 | { |
163 | char *family = support_format_address_family (ai->ai_family); |
164 | fprintf (out, "error: invalid address length %d for %s\n" , |
165 | ai->ai_addrlen, family); |
166 | free (family); |
167 | } |
168 | |
169 | /* ai_addr */ |
170 | { |
171 | char buf[128]; |
172 | uint16_t port; |
173 | const char *ret; |
174 | switch (ai->ai_family) |
175 | { |
176 | case AF_INET: |
177 | { |
178 | struct sockaddr_in *sin = (struct sockaddr_in *) ai->ai_addr; |
179 | ret = inet_ntop (AF_INET, &sin->sin_addr, buf, sizeof (buf)); |
180 | port = sin->sin_port; |
181 | } |
182 | break; |
183 | case AF_INET6: |
184 | { |
185 | struct sockaddr_in6 *sin = (struct sockaddr_in6 *) ai->ai_addr; |
186 | ret = inet_ntop (AF_INET6, &sin->sin6_addr, buf, sizeof (buf)); |
187 | port = sin->sin6_port; |
188 | } |
189 | break; |
190 | default: |
191 | errno = EAFNOSUPPORT; |
192 | ret = NULL; |
193 | } |
194 | if (ret == NULL) |
195 | fprintf (out, "error: inet_top failed: %m\n" ); |
196 | else |
197 | fprintf (out, " %s %u\n" , buf, ntohs (port)); |
198 | } |
199 | } |
200 | |
201 | /* Format all the addresses in one address family. */ |
202 | static void |
203 | format_ai_family (FILE *out, struct addrinfo *ai, int family) |
204 | { |
205 | while (ai) |
206 | { |
207 | if (ai->ai_family == family) |
208 | format_ai_one (out, ai); |
209 | ai = ai->ai_next; |
210 | } |
211 | } |
212 | |
213 | char * |
214 | support_format_addrinfo (struct addrinfo *ai, int ret) |
215 | { |
216 | int errno_copy = errno; |
217 | |
218 | struct xmemstream mem; |
219 | xopen_memstream (&mem); |
220 | if (ret != 0) |
221 | { |
222 | fprintf (mem.out, "error: %s\n" , gai_strerror (ret)); |
223 | if (ret == EAI_SYSTEM) |
224 | { |
225 | errno = errno_copy; |
226 | fprintf (mem.out, "error: %m\n" ); |
227 | } |
228 | } |
229 | else |
230 | { |
231 | format_ai_flags (mem.out, ai); |
232 | format_ai_canonname (mem.out, ai); |
233 | format_ai_family (mem.out, ai, AF_INET); |
234 | format_ai_family (mem.out, ai, AF_INET6); |
235 | } |
236 | |
237 | xfclose_memstream (&mem); |
238 | return mem.buffer; |
239 | } |
240 | |