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1 /* This is from the BIND 4.9.4 release, modified to compile by itself */
2 
3 /* Copyright (c) 1996 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
Curl_inet_pton(int af,const char * src,void * dst)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
inet_pton4(const char * src,unsigned char * dst)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
inet_pton6(const char * src,unsigned char * dst)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 *xdigits, *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 *pch;
172 
173     pch = strchr((xdigits = xdigits_l), ch);
174     if(!pch)
175       pch = strchr((xdigits = xdigits_u), ch);
176     if(pch != NULL) {
177       val <<= 4;
178       val |= (pch - xdigits);
179       if(++saw_xdigit > 4)
180         return (0);
181       continue;
182     }
183     if(ch == ':') {
184       curtok = src;
185       if(!saw_xdigit) {
186         if(colonp)
187           return (0);
188         colonp = tp;
189         continue;
190       }
191       if(tp + INT16SZ > endp)
192         return (0);
193       *tp++ = (unsigned char) ((val >> 8) & 0xff);
194       *tp++ = (unsigned char) (val & 0xff);
195       saw_xdigit = 0;
196       val = 0;
197       continue;
198     }
199     if(ch == '.' && ((tp + INADDRSZ) <= endp) &&
200         inet_pton4(curtok, tp) > 0) {
201       tp += INADDRSZ;
202       saw_xdigit = 0;
203       break;    /* '\0' was seen by inet_pton4(). */
204     }
205     return (0);
206   }
207   if(saw_xdigit) {
208     if(tp + INT16SZ > endp)
209       return (0);
210     *tp++ = (unsigned char) ((val >> 8) & 0xff);
211     *tp++ = (unsigned char) (val & 0xff);
212   }
213   if(colonp != NULL) {
214     /*
215      * Since some memmove()'s erroneously fail to handle
216      * overlapping regions, we'll do the shift by hand.
217      */
218     const ssize_t n = tp - colonp;
219     ssize_t i;
220 
221     if(tp == endp)
222       return (0);
223     for(i = 1; i <= n; i++) {
224       *(endp - i) = *(colonp + n - i);
225       *(colonp + n - i) = 0;
226     }
227     tp = endp;
228   }
229   if(tp != endp)
230     return (0);
231   memcpy(dst, tmp, IN6ADDRSZ);
232   return (1);
233 }
234 #endif /* ENABLE_IPV6 */
235 
236 #endif /* HAVE_INET_PTON */
237