Annotation of embedaddon/curl/lib/inet_pton.c, revision 1.1
1.1 ! misho 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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