1: /* This is from the BIND 4.9.4 release, modified to compile by itself */
2:
3: /* Copyright (c) 1996 - 2019 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
10: * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
11: * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
12: * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
13: * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
14: * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
15: * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
16: * SOFTWARE.
17: */
18:
19: #include "curl_setup.h"
20:
21: #ifndef HAVE_INET_PTON
22:
23: #ifdef HAVE_SYS_PARAM_H
24: #include <sys/param.h>
25: #endif
26: #ifdef HAVE_NETINET_IN_H
27: #include <netinet/in.h>
28: #endif
29: #ifdef HAVE_ARPA_INET_H
30: #include <arpa/inet.h>
31: #endif
32:
33: #include "inet_pton.h"
34:
35: #define IN6ADDRSZ 16
36: #define INADDRSZ 4
37: #define INT16SZ 2
38:
39: /*
40: * WARNING: Don't even consider trying to compile this on a system where
41: * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
42: */
43:
44: static int inet_pton4(const char *src, unsigned char *dst);
45: #ifdef ENABLE_IPV6
46: static int inet_pton6(const char *src, unsigned char *dst);
47: #endif
48:
49: /* int
50: * inet_pton(af, src, dst)
51: * convert from presentation format (which usually means ASCII printable)
52: * to network format (which is usually some kind of binary format).
53: * return:
54: * 1 if the address was valid for the specified address family
55: * 0 if the address wasn't valid (`dst' is untouched in this case)
56: * -1 if some other error occurred (`dst' is untouched in this case, too)
57: * notice:
58: * On Windows we store the error in the thread errno, not
59: * in the winsock error code. This is to avoid losing the
60: * actual last winsock error. So when this function returns
61: * -1, check errno not SOCKERRNO.
62: * author:
63: * Paul Vixie, 1996.
64: */
65: int
66: Curl_inet_pton(int af, const char *src, void *dst)
67: {
68: switch(af) {
69: case AF_INET:
70: return (inet_pton4(src, (unsigned char *)dst));
71: #ifdef ENABLE_IPV6
72: case AF_INET6:
73: return (inet_pton6(src, (unsigned char *)dst));
74: #endif
75: default:
76: errno = EAFNOSUPPORT;
77: return (-1);
78: }
79: /* NOTREACHED */
80: }
81:
82: /* int
83: * inet_pton4(src, dst)
84: * like inet_aton() but without all the hexadecimal and shorthand.
85: * return:
86: * 1 if `src' is a valid dotted quad, else 0.
87: * notice:
88: * does not touch `dst' unless it's returning 1.
89: * author:
90: * Paul Vixie, 1996.
91: */
92: static int
93: inet_pton4(const char *src, unsigned char *dst)
94: {
95: static const char digits[] = "0123456789";
96: int saw_digit, octets, ch;
97: unsigned char tmp[INADDRSZ], *tp;
98:
99: saw_digit = 0;
100: octets = 0;
101: tp = tmp;
102: *tp = 0;
103: while((ch = *src++) != '\0') {
104: const char *pch;
105:
106: pch = strchr(digits, ch);
107: if(pch) {
108: unsigned int val = *tp * 10 + (unsigned int)(pch - digits);
109:
110: if(saw_digit && *tp == 0)
111: return (0);
112: if(val > 255)
113: return (0);
114: *tp = (unsigned char)val;
115: if(! saw_digit) {
116: if(++octets > 4)
117: return (0);
118: saw_digit = 1;
119: }
120: }
121: else if(ch == '.' && saw_digit) {
122: if(octets == 4)
123: return (0);
124: *++tp = 0;
125: saw_digit = 0;
126: }
127: else
128: return (0);
129: }
130: if(octets < 4)
131: return (0);
132: memcpy(dst, tmp, INADDRSZ);
133: return (1);
134: }
135:
136: #ifdef ENABLE_IPV6
137: /* int
138: * inet_pton6(src, dst)
139: * convert presentation level address to network order binary form.
140: * return:
141: * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
142: * notice:
143: * (1) does not touch `dst' unless it's returning 1.
144: * (2) :: in a full address is silently ignored.
145: * credit:
146: * inspired by Mark Andrews.
147: * author:
148: * Paul Vixie, 1996.
149: */
150: static int
151: inet_pton6(const char *src, unsigned char *dst)
152: {
153: static const char xdigits_l[] = "0123456789abcdef",
154: xdigits_u[] = "0123456789ABCDEF";
155: unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
156: const char *curtok;
157: int ch, saw_xdigit;
158: size_t val;
159:
160: memset((tp = tmp), 0, IN6ADDRSZ);
161: endp = tp + IN6ADDRSZ;
162: colonp = NULL;
163: /* Leading :: requires some special handling. */
164: if(*src == ':')
165: if(*++src != ':')
166: return (0);
167: curtok = src;
168: saw_xdigit = 0;
169: val = 0;
170: while((ch = *src++) != '\0') {
171: const char *xdigits;
172: const char *pch;
173:
174: pch = strchr((xdigits = xdigits_l), ch);
175: if(!pch)
176: pch = strchr((xdigits = xdigits_u), ch);
177: if(pch != NULL) {
178: val <<= 4;
179: val |= (pch - xdigits);
180: if(++saw_xdigit > 4)
181: return (0);
182: continue;
183: }
184: if(ch == ':') {
185: curtok = src;
186: if(!saw_xdigit) {
187: if(colonp)
188: return (0);
189: colonp = tp;
190: continue;
191: }
192: if(tp + INT16SZ > endp)
193: return (0);
194: *tp++ = (unsigned char) ((val >> 8) & 0xff);
195: *tp++ = (unsigned char) (val & 0xff);
196: saw_xdigit = 0;
197: val = 0;
198: continue;
199: }
200: if(ch == '.' && ((tp + INADDRSZ) <= endp) &&
201: inet_pton4(curtok, tp) > 0) {
202: tp += INADDRSZ;
203: saw_xdigit = 0;
204: break; /* '\0' was seen by inet_pton4(). */
205: }
206: return (0);
207: }
208: if(saw_xdigit) {
209: if(tp + INT16SZ > endp)
210: return (0);
211: *tp++ = (unsigned char) ((val >> 8) & 0xff);
212: *tp++ = (unsigned char) (val & 0xff);
213: }
214: if(colonp != NULL) {
215: /*
216: * Since some memmove()'s erroneously fail to handle
217: * overlapping regions, we'll do the shift by hand.
218: */
219: const ssize_t n = tp - colonp;
220: ssize_t i;
221:
222: if(tp == endp)
223: return (0);
224: for(i = 1; i <= n; i++) {
225: *(endp - i) = *(colonp + n - i);
226: *(colonp + n - i) = 0;
227: }
228: tp = endp;
229: }
230: if(tp != endp)
231: return (0);
232: memcpy(dst, tmp, IN6ADDRSZ);
233: return (1);
234: }
235: #endif /* ENABLE_IPV6 */
236:
237: #endif /* HAVE_INET_PTON */
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