1/*
2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1996-1999 by Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#include <stdio.h>
19#include <string.h>
20
21#if defined(_MSC_VER) && _MSC_VER < 1600
22# include "uv/stdint-msvc2008.h"
23#else
24# include <stdint.h>
25#endif
26
27#include "uv.h"
28#include "uv-common.h"
29
30#define UV__INET_ADDRSTRLEN 16
31#define UV__INET6_ADDRSTRLEN 46
32
33
34static int inet_ntop4(const unsigned char *src, char *dst, size_t size);
35static int inet_ntop6(const unsigned char *src, char *dst, size_t size);
36static int inet_pton4(const char *src, unsigned char *dst);
37static int inet_pton6(const char *src, unsigned char *dst);
38
39
40int uv_inet_ntop(int af, const void* src, char* dst, size_t size) {
41 switch (af) {
42 case AF_INET:
43 return (inet_ntop4(src, dst, size));
44 case AF_INET6:
45 return (inet_ntop6(src, dst, size));
46 default:
47 return UV_EAFNOSUPPORT;
48 }
49 /* NOTREACHED */
50}
51
52
53static int inet_ntop4(const unsigned char *src, char *dst, size_t size) {
54 static const char fmt[] = "%u.%u.%u.%u";
55 char tmp[UV__INET_ADDRSTRLEN];
56 int l;
57
58 l = snprintf(tmp, sizeof(tmp), fmt, src[0], src[1], src[2], src[3]);
59 if (l <= 0 || (size_t) l >= size) {
60 return UV_ENOSPC;
61 }
62 uv__strscpy(dst, tmp, size);
63 return 0;
64}
65
66
67static int inet_ntop6(const unsigned char *src, char *dst, size_t size) {
68 /*
69 * Note that int32_t and int16_t need only be "at least" large enough
70 * to contain a value of the specified size. On some systems, like
71 * Crays, there is no such thing as an integer variable with 16 bits.
72 * Keep this in mind if you think this function should have been coded
73 * to use pointer overlays. All the world's not a VAX.
74 */
75 char tmp[UV__INET6_ADDRSTRLEN], *tp;
76 struct { int base, len; } best, cur;
77 unsigned int words[sizeof(struct in6_addr) / sizeof(uint16_t)];
78 int i;
79
80 /*
81 * Preprocess:
82 * Copy the input (bytewise) array into a wordwise array.
83 * Find the longest run of 0x00's in src[] for :: shorthanding.
84 */
85 memset(words, '\0', sizeof words);
86 for (i = 0; i < (int) sizeof(struct in6_addr); i++)
87 words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
88 best.base = -1;
89 best.len = 0;
90 cur.base = -1;
91 cur.len = 0;
92 for (i = 0; i < (int) ARRAY_SIZE(words); i++) {
93 if (words[i] == 0) {
94 if (cur.base == -1)
95 cur.base = i, cur.len = 1;
96 else
97 cur.len++;
98 } else {
99 if (cur.base != -1) {
100 if (best.base == -1 || cur.len > best.len)
101 best = cur;
102 cur.base = -1;
103 }
104 }
105 }
106 if (cur.base != -1) {
107 if (best.base == -1 || cur.len > best.len)
108 best = cur;
109 }
110 if (best.base != -1 && best.len < 2)
111 best.base = -1;
112
113 /*
114 * Format the result.
115 */
116 tp = tmp;
117 for (i = 0; i < (int) ARRAY_SIZE(words); i++) {
118 /* Are we inside the best run of 0x00's? */
119 if (best.base != -1 && i >= best.base &&
120 i < (best.base + best.len)) {
121 if (i == best.base)
122 *tp++ = ':';
123 continue;
124 }
125 /* Are we following an initial run of 0x00s or any real hex? */
126 if (i != 0)
127 *tp++ = ':';
128 /* Is this address an encapsulated IPv4? */
129 if (i == 6 && best.base == 0 && (best.len == 6 ||
130 (best.len == 7 && words[7] != 0x0001) ||
131 (best.len == 5 && words[5] == 0xffff))) {
132 int err = inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp));
133 if (err)
134 return err;
135 tp += strlen(tp);
136 break;
137 }
138 tp += sprintf(tp, "%x", words[i]);
139 }
140 /* Was it a trailing run of 0x00's? */
141 if (best.base != -1 && (best.base + best.len) == ARRAY_SIZE(words))
142 *tp++ = ':';
143 *tp++ = '\0';
144 if (UV_E2BIG == uv__strscpy(dst, tmp, size))
145 return UV_ENOSPC;
146 return 0;
147}
148
149
150int uv_inet_pton(int af, const char* src, void* dst) {
151 if (src == NULL || dst == NULL)
152 return UV_EINVAL;
153
154 switch (af) {
155 case AF_INET:
156 return (inet_pton4(src, dst));
157 case AF_INET6: {
158 int len;
159 char tmp[UV__INET6_ADDRSTRLEN], *s, *p;
160 s = (char*) src;
161 p = strchr(src, '%');
162 if (p != NULL) {
163 s = tmp;
164 len = p - src;
165 if (len > UV__INET6_ADDRSTRLEN-1)
166 return UV_EINVAL;
167 memcpy(s, src, len);
168 s[len] = '\0';
169 }
170 return inet_pton6(s, dst);
171 }
172 default:
173 return UV_EAFNOSUPPORT;
174 }
175 /* NOTREACHED */
176}
177
178
179static int inet_pton4(const char *src, unsigned char *dst) {
180 static const char digits[] = "0123456789";
181 int saw_digit, octets, ch;
182 unsigned char tmp[sizeof(struct in_addr)], *tp;
183
184 saw_digit = 0;
185 octets = 0;
186 *(tp = tmp) = 0;
187 while ((ch = *src++) != '\0') {
188 const char *pch;
189
190 if ((pch = strchr(digits, ch)) != NULL) {
191 unsigned int nw = *tp * 10 + (pch - digits);
192
193 if (saw_digit && *tp == 0)
194 return UV_EINVAL;
195 if (nw > 255)
196 return UV_EINVAL;
197 *tp = nw;
198 if (!saw_digit) {
199 if (++octets > 4)
200 return UV_EINVAL;
201 saw_digit = 1;
202 }
203 } else if (ch == '.' && saw_digit) {
204 if (octets == 4)
205 return UV_EINVAL;
206 *++tp = 0;
207 saw_digit = 0;
208 } else
209 return UV_EINVAL;
210 }
211 if (octets < 4)
212 return UV_EINVAL;
213 memcpy(dst, tmp, sizeof(struct in_addr));
214 return 0;
215}
216
217
218static int inet_pton6(const char *src, unsigned char *dst) {
219 static const char xdigits_l[] = "0123456789abcdef",
220 xdigits_u[] = "0123456789ABCDEF";
221 unsigned char tmp[sizeof(struct in6_addr)], *tp, *endp, *colonp;
222 const char *xdigits, *curtok;
223 int ch, seen_xdigits;
224 unsigned int val;
225
226 memset((tp = tmp), '\0', sizeof tmp);
227 endp = tp + sizeof tmp;
228 colonp = NULL;
229 /* Leading :: requires some special handling. */
230 if (*src == ':')
231 if (*++src != ':')
232 return UV_EINVAL;
233 curtok = src;
234 seen_xdigits = 0;
235 val = 0;
236 while ((ch = *src++) != '\0') {
237 const char *pch;
238
239 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
240 pch = strchr((xdigits = xdigits_u), ch);
241 if (pch != NULL) {
242 val <<= 4;
243 val |= (pch - xdigits);
244 if (++seen_xdigits > 4)
245 return UV_EINVAL;
246 continue;
247 }
248 if (ch == ':') {
249 curtok = src;
250 if (!seen_xdigits) {
251 if (colonp)
252 return UV_EINVAL;
253 colonp = tp;
254 continue;
255 } else if (*src == '\0') {
256 return UV_EINVAL;
257 }
258 if (tp + sizeof(uint16_t) > endp)
259 return UV_EINVAL;
260 *tp++ = (unsigned char) (val >> 8) & 0xff;
261 *tp++ = (unsigned char) val & 0xff;
262 seen_xdigits = 0;
263 val = 0;
264 continue;
265 }
266 if (ch == '.' && ((tp + sizeof(struct in_addr)) <= endp)) {
267 int err = inet_pton4(curtok, tp);
268 if (err == 0) {
269 tp += sizeof(struct in_addr);
270 seen_xdigits = 0;
271 break; /*%< '\\0' was seen by inet_pton4(). */
272 }
273 }
274 return UV_EINVAL;
275 }
276 if (seen_xdigits) {
277 if (tp + sizeof(uint16_t) > endp)
278 return UV_EINVAL;
279 *tp++ = (unsigned char) (val >> 8) & 0xff;
280 *tp++ = (unsigned char) val & 0xff;
281 }
282 if (colonp != NULL) {
283 /*
284 * Since some memmove()'s erroneously fail to handle
285 * overlapping regions, we'll do the shift by hand.
286 */
287 const int n = tp - colonp;
288 int i;
289
290 if (tp == endp)
291 return UV_EINVAL;
292 for (i = 1; i <= n; i++) {
293 endp[- i] = colonp[n - i];
294 colonp[n - i] = 0;
295 }
296 tp = endp;
297 }
298 if (tp != endp)
299 return UV_EINVAL;
300 memcpy(dst, tmp, sizeof tmp);
301 return 0;
302}
303