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author | guenther <> | 2014-04-19 11:18:01 +0000 |
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committer | guenther <> | 2014-04-19 11:18:01 +0000 |
commit | 442335bf77f2f6653794378cc53adb59bba1ed12 (patch) | |
tree | 2d4d6567e4224e5b538d0c518319524895f5a922 /src/lib/libc/net/inet.3 | |
parent | 390a6ad86d0c194f7195536ef4f2b8f55ead29a5 (diff) | |
download | openbsd-442335bf77f2f6653794378cc53adb59bba1ed12.tar.gz openbsd-442335bf77f2f6653794378cc53adb59bba1ed12.tar.bz2 openbsd-442335bf77f2f6653794378cc53adb59bba1ed12.zip |
Split inet(3) into three pages by decade: 1980s -> inet_lnaof(3),
1990s -> inet_addr(3), 2000s and beyond -> inet_ntop(3).
ok tedu@ (who also noted the timeline) deraadt@ jmc@
Diffstat (limited to 'src/lib/libc/net/inet.3')
-rw-r--r-- | src/lib/libc/net/inet.3 | 355 |
1 files changed, 0 insertions, 355 deletions
diff --git a/src/lib/libc/net/inet.3 b/src/lib/libc/net/inet.3 deleted file mode 100644 index e56ca0a59a..0000000000 --- a/src/lib/libc/net/inet.3 +++ /dev/null | |||
@@ -1,355 +0,0 @@ | |||
1 | .\" $OpenBSD: inet.3,v 1.26 2013/06/05 03:39:23 tedu Exp $ | ||
2 | .\" $NetBSD: inet.3,v 1.7 1997/06/18 02:25:24 lukem Exp $ | ||
3 | .\" | ||
4 | .\" Copyright (c) 1983, 1990, 1991, 1993 | ||
5 | .\" The Regents of the University of California. All rights reserved. | ||
6 | .\" | ||
7 | .\" Redistribution and use in source and binary forms, with or without | ||
8 | .\" modification, are permitted provided that the following conditions | ||
9 | .\" are met: | ||
10 | .\" 1. Redistributions of source code must retain the above copyright | ||
11 | .\" notice, this list of conditions and the following disclaimer. | ||
12 | .\" 2. Redistributions in binary form must reproduce the above copyright | ||
13 | .\" notice, this list of conditions and the following disclaimer in the | ||
14 | .\" documentation and/or other materials provided with the distribution. | ||
15 | .\" 3. Neither the name of the University nor the names of its contributors | ||
16 | .\" may be used to endorse or promote products derived from this software | ||
17 | .\" without specific prior written permission. | ||
18 | .\" | ||
19 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | ||
20 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
21 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
22 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | ||
23 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
24 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | ||
25 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | ||
26 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
27 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||
28 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | ||
29 | .\" SUCH DAMAGE. | ||
30 | .\" | ||
31 | .\" @(#)inet.3 8.1 (Berkeley) 6/4/93 | ||
32 | .\" | ||
33 | .Dd $Mdocdate: June 5 2013 $ | ||
34 | .Dt INET 3 | ||
35 | .Os | ||
36 | .Sh NAME | ||
37 | .Nm inet_aton , | ||
38 | .Nm inet_addr , | ||
39 | .Nm inet_network , | ||
40 | .Nm inet_pton , | ||
41 | .Nm inet_ntop , | ||
42 | .Nm inet_ntoa , | ||
43 | .Nm inet_makeaddr , | ||
44 | .Nm inet_netof , | ||
45 | .Nm inet_lnaof | ||
46 | .Nd Internet address manipulation routines | ||
47 | .Sh SYNOPSIS | ||
48 | .In sys/types.h | ||
49 | .In sys/socket.h | ||
50 | .In netinet/in.h | ||
51 | .In arpa/inet.h | ||
52 | .Ft int | ||
53 | .Fn inet_aton "const char *cp" "struct in_addr *addr" | ||
54 | .Ft in_addr_t | ||
55 | .Fn inet_addr "const char *cp" | ||
56 | .Ft in_addr_t | ||
57 | .Fn inet_network "const char *cp" | ||
58 | .Ft int | ||
59 | .Fn inet_pton "int af" "const char *src" "void *dst" | ||
60 | .Ft const char * | ||
61 | .Fn inet_ntop "int af" "const void *src" "char *dst" "socklen_t size" | ||
62 | .Ft char * | ||
63 | .Fn inet_ntoa "struct in_addr in" | ||
64 | .Ft struct in_addr | ||
65 | .Fn inet_makeaddr "in_addr_t net" "in_addr_t lna" | ||
66 | .Ft in_addr_t | ||
67 | .Fn inet_netof "struct in_addr in" | ||
68 | .Ft in_addr_t | ||
69 | .Fn inet_lnaof "struct in_addr in" | ||
70 | .Sh DESCRIPTION | ||
71 | The routines | ||
72 | .Fn inet_aton , | ||
73 | .Fn inet_addr , | ||
74 | and | ||
75 | .Fn inet_network | ||
76 | interpret character strings representing | ||
77 | numbers expressed in the Internet standard | ||
78 | .Dq dot | ||
79 | notation. | ||
80 | .Pp | ||
81 | The | ||
82 | .Fn inet_aton | ||
83 | routine interprets the specified character string as an Internet address, | ||
84 | placing the address into the structure provided. | ||
85 | It returns 1 if the string was successfully interpreted, | ||
86 | or 0 if the string was invalid. | ||
87 | .Pp | ||
88 | The | ||
89 | .Fn inet_addr | ||
90 | and | ||
91 | .Fn inet_network | ||
92 | functions return numbers suitable for use | ||
93 | as Internet addresses and Internet network | ||
94 | numbers, respectively. | ||
95 | Both functions return the constant | ||
96 | .Dv INADDR_NONE | ||
97 | if the specified character string is malformed. | ||
98 | .Pp | ||
99 | The | ||
100 | .Fn inet_pton | ||
101 | function converts a presentation format address (that is, printable form | ||
102 | as held in a character string) to network format (usually a | ||
103 | .Li struct in_addr | ||
104 | or some other internal binary representation, in network byte order). | ||
105 | It returns 1 if the address was valid for the specified address family; | ||
106 | 0 if the address wasn't parseable in the specified address family; or \-1 | ||
107 | if some system error occurred (in which case | ||
108 | .Va errno | ||
109 | will have been set). | ||
110 | This function is presently valid for | ||
111 | .Dv AF_INET | ||
112 | and | ||
113 | .Dv AF_INET6 . | ||
114 | .Pp | ||
115 | The function | ||
116 | .Fn inet_ntop | ||
117 | converts an address from network format (usually a | ||
118 | .Li struct in_addr | ||
119 | or some other binary form, in network byte order) to presentation format | ||
120 | (suitable for external display purposes). | ||
121 | It returns | ||
122 | .Dv NULL | ||
123 | if a system | ||
124 | error occurs (in which case, | ||
125 | .Va errno | ||
126 | will have been set), or it returns a pointer to the destination string. | ||
127 | .Pp | ||
128 | The routine | ||
129 | .Fn inet_ntoa | ||
130 | takes an Internet address and returns an | ||
131 | ASCII string representing the address in dot notation. | ||
132 | .Pp | ||
133 | The routine | ||
134 | .Fn inet_makeaddr | ||
135 | takes an Internet network number and a local | ||
136 | network address and constructs an Internet address | ||
137 | from it. | ||
138 | .Pp | ||
139 | The routines | ||
140 | .Fn inet_netof | ||
141 | and | ||
142 | .Fn inet_lnaof | ||
143 | break apart Internet host addresses, returning | ||
144 | the network number and local network address part, | ||
145 | respectively. | ||
146 | .Pp | ||
147 | All Internet addresses are returned in network | ||
148 | order (bytes ordered from left to right). | ||
149 | All network numbers and local address parts are | ||
150 | returned as machine format integer values. | ||
151 | .Sh INTERNET ADDRESSES (IP VERSION 4) | ||
152 | Values specified using dot notation take one of the following forms: | ||
153 | .Bd -literal -offset indent | ||
154 | a.b.c.d | ||
155 | a.b.c | ||
156 | a.b | ||
157 | a | ||
158 | .Ed | ||
159 | .Pp | ||
160 | When four parts are specified, each is interpreted | ||
161 | as a byte of data and assigned, from left to right, | ||
162 | to the four bytes of an Internet address. | ||
163 | Note that when an Internet address is viewed as a 32-bit | ||
164 | integer quantity on a system that uses little-endian | ||
165 | byte order | ||
166 | (such as the Intel 386, 486 and Pentium processors) | ||
167 | the bytes referred to above appear as | ||
168 | .Dq Li d.c.b.a . | ||
169 | That is, little-endian bytes are ordered from right to left. | ||
170 | .Pp | ||
171 | When a three part address is specified, the last | ||
172 | part is interpreted as a 16-bit quantity and placed | ||
173 | in the rightmost two bytes of the network address. | ||
174 | This makes the three part address format convenient | ||
175 | for specifying Class B network addresses as | ||
176 | .Dq Li 128.net.host . | ||
177 | .Pp | ||
178 | When a two part address is supplied, the last part | ||
179 | is interpreted as a 24-bit quantity and placed in | ||
180 | the rightmost three bytes of the network address. | ||
181 | This makes the two part address format convenient | ||
182 | for specifying Class A network addresses as | ||
183 | .Dq Li net.host . | ||
184 | .Pp | ||
185 | When only one part is given, the value is stored | ||
186 | directly in the network address without any byte | ||
187 | rearrangement. | ||
188 | .Pp | ||
189 | All numbers supplied as | ||
190 | .Dq parts | ||
191 | in a dot notation | ||
192 | may be decimal, octal, or hexadecimal, as specified | ||
193 | in the C language (i.e., a leading 0x or 0X implies | ||
194 | hexadecimal; a leading 0 implies octal; | ||
195 | otherwise, the number is interpreted as decimal). | ||
196 | .Sh INTERNET ADDRESSES (IP VERSION 6) | ||
197 | In order to support scoped IPv6 addresses, | ||
198 | .Xr getaddrinfo 3 | ||
199 | and | ||
200 | .Xr getnameinfo 3 | ||
201 | are recommended rather than the functions presented here. | ||
202 | .Pp | ||
203 | The presentation format of an IPv6 address is given in RFC 4291: | ||
204 | .Pp | ||
205 | There are three conventional forms for representing IPv6 addresses as | ||
206 | text strings: | ||
207 | .Bl -enum | ||
208 | .It | ||
209 | The preferred form is x:x:x:x:x:x:x:x, where the 'x's are the | ||
210 | hexadecimal values of the eight 16-bit pieces of the address. | ||
211 | Examples: | ||
212 | .Bd -literal -offset indent | ||
213 | FEDC:BA98:7654:3210:FEDC:BA98:7654:3210 | ||
214 | 1080:0:0:0:8:800:200C:417A | ||
215 | .Ed | ||
216 | .Pp | ||
217 | Note that it is not necessary to write the leading zeros in an | ||
218 | individual field, but there must be at least one numeral in | ||
219 | every field (except for the case described in 2.). | ||
220 | .It | ||
221 | Due to the method of allocating certain styles of IPv6 | ||
222 | addresses, it will be common for addresses to contain long | ||
223 | strings of zero bits. | ||
224 | In order to make writing addresses | ||
225 | containing zero bits easier, a special syntax is available to | ||
226 | compress the zeros. | ||
227 | The use of | ||
228 | .Dq \&:\&: | ||
229 | indicates multiple groups | ||
230 | of 16 bits of zeros. | ||
231 | The | ||
232 | .Dq \&:\&: | ||
233 | can only appear once in an | ||
234 | address. | ||
235 | The | ||
236 | .Dq \&:\&: | ||
237 | can also be used to compress the leading and/or trailing zeros in an address. | ||
238 | .Pp | ||
239 | For example the following addresses: | ||
240 | .Bd -literal -offset indent | ||
241 | 1080:0:0:0:8:800:200C:417A a unicast address | ||
242 | FF01:0:0:0:0:0:0:43 a multicast address | ||
243 | 0:0:0:0:0:0:0:1 the loopback address | ||
244 | 0:0:0:0:0:0:0:0 the unspecified addresses | ||
245 | .Ed | ||
246 | .Pp | ||
247 | may be represented as: | ||
248 | .Bd -literal -offset indent | ||
249 | 1080::8:800:200C:417A a unicast address | ||
250 | FF01::43 a multicast address | ||
251 | ::1 the loopback address | ||
252 | :: the unspecified addresses | ||
253 | .Ed | ||
254 | .It | ||
255 | An alternative form that is sometimes more convenient when | ||
256 | dealing with a mixed environment of IPv4 and IPv6 nodes is | ||
257 | x:x:x:x:x:x:d.d.d.d, where the 'x's are the hexadecimal values | ||
258 | of the six high-order 16-bit pieces of the address, and the 'd's | ||
259 | are the decimal values of the four low-order 8-bit pieces of the | ||
260 | address (standard IPv4 representation). | ||
261 | Examples: | ||
262 | .Bd -literal -offset indent | ||
263 | 0:0:0:0:0:0:13.1.68.3 | ||
264 | 0:0:0:0:0:FFFF:129.144.52.38 | ||
265 | .Ed | ||
266 | .Pp | ||
267 | or in compressed form: | ||
268 | .Bd -literal -offset indent | ||
269 | ::13.1.68.3 | ||
270 | ::FFFF:129.144.52.38 | ||
271 | .Ed | ||
272 | .El | ||
273 | .Sh SEE ALSO | ||
274 | .Xr byteorder 3 , | ||
275 | .Xr gethostbyname 3 , | ||
276 | .Xr getnetent 3 , | ||
277 | .Xr inet_net 3 , | ||
278 | .Xr hosts 5 , | ||
279 | .Xr networks 5 | ||
280 | .Sh STANDARDS | ||
281 | The | ||
282 | .Nm inet_ntop | ||
283 | and | ||
284 | .Nm inet_pton | ||
285 | functions conform to the IETF IPv6 BSD API and address formatting | ||
286 | specifications. | ||
287 | Note that | ||
288 | .Nm inet_pton | ||
289 | does not accept 1-, 2-, or 3-part dotted addresses; all four parts | ||
290 | must be specified. | ||
291 | This is a narrower input set than that accepted by | ||
292 | .Nm inet_aton . | ||
293 | .Pp | ||
294 | .Rs | ||
295 | .%A R. Gilligan | ||
296 | .%A S. Thomson | ||
297 | .%A J. Bound | ||
298 | .%A J. McCann | ||
299 | .%A W. Stevens | ||
300 | .%D February 2003 | ||
301 | .%R RFC 3493 | ||
302 | .%T Basic Socket Interface Extensions for IPv6 | ||
303 | .Re | ||
304 | .Pp | ||
305 | .Rs | ||
306 | .%A R. Hinden | ||
307 | .%A S. Deering | ||
308 | .%D February 2006 | ||
309 | .%R RFC 4291 | ||
310 | .%T IP Version 6 Addressing Architecture | ||
311 | .Re | ||
312 | .Sh HISTORY | ||
313 | The | ||
314 | .Nm inet_addr , | ||
315 | .Nm inet_network , | ||
316 | .Nm inet_makeaddr , | ||
317 | .Nm inet_lnaof , | ||
318 | and | ||
319 | .Nm inet_netof | ||
320 | functions appeared in | ||
321 | .Bx 4.2 . | ||
322 | The | ||
323 | .Nm inet_aton | ||
324 | and | ||
325 | .Nm inet_ntoa | ||
326 | functions appeared in | ||
327 | .Bx 4.3 . | ||
328 | The | ||
329 | .Nm inet_pton | ||
330 | and | ||
331 | .Nm inet_ntop | ||
332 | functions appeared in BIND 4.9.4. | ||
333 | .Sh BUGS | ||
334 | The value | ||
335 | .Dv INADDR_NONE | ||
336 | (0xffffffff) is a valid broadcast address, but | ||
337 | .Fn inet_addr | ||
338 | cannot return that value without indicating failure. | ||
339 | Also, | ||
340 | .Fn inet_addr | ||
341 | should have been designed to return a | ||
342 | .Li struct in_addr . | ||
343 | The newer | ||
344 | .Fn inet_aton | ||
345 | function does not share these problems, and almost all existing code | ||
346 | should be modified to use | ||
347 | .Fn inet_aton | ||
348 | instead. | ||
349 | .Pp | ||
350 | The problem of host byte ordering versus network byte ordering is | ||
351 | confusing. | ||
352 | .Pp | ||
353 | The string returned by | ||
354 | .Fn inet_ntoa | ||
355 | resides in a static memory area. | ||