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 use macro ERRNO to fetch the
61  *      errno this function sets when returning (-1), 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     SET_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     if((pch = strchr(digits, ch)) != NULL) {
107       unsigned int val = *tp * 10 + (unsigned int)(pch - digits);
108 
109       if(saw_digit && *tp == 0)
110         return (0);
111       if(val > 255)
112         return (0);
113       *tp = (unsigned char)val;
114       if(! saw_digit) {
115         if(++octets > 4)
116           return (0);
117         saw_digit = 1;
118       }
119     }
120     else if(ch == '.' && saw_digit) {
121       if(octets == 4)
122         return (0);
123       *++tp = 0;
124       saw_digit = 0;
125     }
126     else
127       return (0);
128   }
129   if(octets < 4)
130     return (0);
131   memcpy(dst, tmp, INADDRSZ);
132   return (1);
133 }
134 
135 #ifdef ENABLE_IPV6
136 /* int
137  * inet_pton6(src, dst)
138  *      convert presentation level address to network order binary form.
139  * return:
140  *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
141  * notice:
142  *      (1) does not touch `dst' unless it's returning 1.
143  *      (2) :: in a full address is silently ignored.
144  * credit:
145  *      inspired by Mark Andrews.
146  * author:
147  *      Paul Vixie, 1996.
148  */
149 static int
inet_pton6(const char * src,unsigned char * dst)150 inet_pton6(const char *src, unsigned char *dst)
151 {
152   static const char xdigits_l[] = "0123456789abcdef",
153     xdigits_u[] = "0123456789ABCDEF";
154   unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
155   const char *xdigits, *curtok;
156   int ch, saw_xdigit;
157   size_t val;
158 
159   memset((tp = tmp), 0, IN6ADDRSZ);
160   endp = tp + IN6ADDRSZ;
161   colonp = NULL;
162   /* Leading :: requires some special handling. */
163   if(*src == ':')
164     if(*++src != ':')
165       return (0);
166   curtok = src;
167   saw_xdigit = 0;
168   val = 0;
169   while((ch = *src++) != '\0') {
170     const char *pch;
171 
172     if((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
173       pch = strchr((xdigits = xdigits_u), ch);
174     if(pch != NULL) {
175       val <<= 4;
176       val |= (pch - xdigits);
177       if(++saw_xdigit > 4)
178         return (0);
179       continue;
180     }
181     if(ch == ':') {
182       curtok = src;
183       if(!saw_xdigit) {
184         if(colonp)
185           return (0);
186         colonp = tp;
187         continue;
188       }
189       if(tp + INT16SZ > endp)
190         return (0);
191       *tp++ = (unsigned char) (val >> 8) & 0xff;
192       *tp++ = (unsigned char) val & 0xff;
193       saw_xdigit = 0;
194       val = 0;
195       continue;
196     }
197     if(ch == '.' && ((tp + INADDRSZ) <= endp) &&
198         inet_pton4(curtok, tp) > 0) {
199       tp += INADDRSZ;
200       saw_xdigit = 0;
201       break;    /* '\0' was seen by inet_pton4(). */
202     }
203     return (0);
204   }
205   if(saw_xdigit) {
206     if(tp + INT16SZ > endp)
207       return (0);
208     *tp++ = (unsigned char) (val >> 8) & 0xff;
209     *tp++ = (unsigned char) val & 0xff;
210   }
211   if(colonp != NULL) {
212     /*
213      * Since some memmove()'s erroneously fail to handle
214      * overlapping regions, we'll do the shift by hand.
215      */
216     const ssize_t n = tp - colonp;
217     ssize_t i;
218 
219     if(tp == endp)
220       return (0);
221     for(i = 1; i <= n; i++) {
222       *(endp - i) = *(colonp + n - i);
223       *(colonp + n - i) = 0;
224     }
225     tp = endp;
226   }
227   if(tp != endp)
228     return (0);
229   memcpy(dst, tmp, IN6ADDRSZ);
230   return (1);
231 }
232 #endif /* ENABLE_IPV6 */
233 
234 #endif /* HAVE_INET_PTON */
235