/* * Copyright (c) 1996-1999 by Internet Software Consortium. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS * SOFTWARE. */ #include #include #include #include #include #include #include #include #include /* * WARNING: Don't even consider trying to compile this on a system where * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. */ /* const char * * inet_ntop4(src, dst, size) * format an IPv4 address * return: * `dst' (as a const) * notes: * (1) uses no statics * (2) takes a u_char* not an in_addr as input * author: * Paul Vixie, 1996. */ static const char * inet_ntop4(src, dst, size) const u_char *src; char *dst; socklen_t size; { char tmp[sizeof ("255.255.255.255") + 1] = "\0"; int octet; int i; i = 0; for (octet = 0; octet <= 3; octet++) { if (src[octet] > 255) { __set_errno (ENOSPC); return (NULL); } tmp[i++] = '0' + src[octet] / 100; if (tmp[i - 1] == '0') { tmp[i - 1] = '0' + (src[octet] / 10 % 10); if (tmp[i - 1] == '0') i--; } else { tmp[i++] = '0' + (src[octet] / 10 % 10); } tmp[i++] = '0' + src[octet] % 10; tmp[i++] = '.'; } tmp[i - 1] = '\0'; if (strlen (tmp) > size) { __set_errno (ENOSPC); return (NULL); } return strcpy(dst, tmp); } /* const char * * inet_ntop6(src, dst, size) * convert IPv6 binary address into presentation (printable) format * author: * Paul Vixie, 1996. */ #ifdef INET_IPV6 static const char * inet_ntop6(src, dst, size) const u_char *src; char *dst; socklen_t size; { /* * Note that int32_t and int16_t need only be "at least" large enough * to contain a value of the specified size. On some systems, like * Crays, there is no such thing as an integer variable with 16 bits. * Keep this in mind if you think this function should have been coded * to use pointer overlays. All the world's not a VAX. */ char tmp[sizeof ("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")], *tp; struct { int base, len; } best, cur; u_int words[8]; int i; /* * Preprocess: * Copy the input (bytewise) array into a wordwise array. * Find the longest run of 0x00's in src[] for :: shorthanding. */ memset(words, '\0', sizeof words); for (i = 0; i < 16; i += 2) words[i / 2] = (src[i] << 8) | src[i + 1]; best.base = -1; cur.base = -1; for (i = 0; i < 8; i++) { if (words[i] == 0) { if (cur.base == -1) cur.base = i, cur.len = 1; else cur.len++; } else { if (cur.base != -1) { if (best.base == -1 || cur.len > best.len) best = cur; cur.base = -1; } } } if (cur.base != -1) { if (best.base == -1 || cur.len > best.len) best = cur; } if (best.base != -1 && best.len < 2) best.base = -1; /* * Format the result. */ tp = tmp; for (i = 0; i < 8; i++) { /* Are we inside the best run of 0x00's? */ if (best.base != -1 && i >= best.base && i < (best.base + best.len)) { if (i == best.base) *tp++ = ':'; continue; } /* Are we following an initial run of 0x00s or any real hex? */ if (i != 0) *tp++ = ':'; /* Is this address an encapsulated IPv4? */ if (i == 6 && best.base == 0 && (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) { if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp))) return (NULL); tp += strlen(tp); break; } tp += SPRINTF((tp, "%x", words[i])); } /* Was it a trailing run of 0x00's? */ if (best.base != -1 && (best.base + best.len) == 8) *tp++ = ':'; *tp++ = '\0'; /* * Check for overflow, copy, and we're done. */ if ((socklen_t)(tp - tmp) > size) { __set_errno (ENOSPC); return (NULL); } return strcpy(dst, tmp); } #endif /* INET_IPV6 */ /* int * inet_pton4(src, dst) * like inet_aton() but without all the hexadecimal and shorthand. * return: * 1 if `src' is a valid dotted quad, else 0. * notice: * does not touch `dst' unless it's returning 1. * author: * Paul Vixie, 1996. */ static int inet_pton4(src, dst) const char *src; u_char *dst; { int saw_digit, octets, ch; u_char tmp[4], *tp; saw_digit = 0; octets = 0; *(tp = tmp) = 0; while ((ch = *src++) != '\0') { if (ch >= '0' && ch <= '9') { u_int new = *tp * 10 + (ch - '0'); if (new > 255) return (0); *tp = new; if (! saw_digit) { if (++octets > 4) return (0); saw_digit = 1; } } else if (ch == '.' && saw_digit) { if (octets == 4) return (0); *++tp = 0; saw_digit = 0; } else return (0); } if (octets < 4) return (0); memcpy(dst, tmp, 4); return (1); } /* int * inet_pton6(src, dst) * convert presentation level address to network order binary form. * return: * 1 if `src' is a valid [RFC1884 2.2] address, else 0. * notice: * (1) does not touch `dst' unless it's returning 1. * (2) :: in a full address is silently ignored. * credit: * inspired by Mark Andrews. * author: * Paul Vixie, 1996. */ #ifdef INET_IPV6 static int inet_pton6(src, dst) const char *src; u_char *dst; { static const char xdigits[] = "0123456789abcdef"; u_char tmp[16], *tp, *endp, *colonp; const char *curtok; int ch, saw_xdigit; u_int val; tp = memset(tmp, '\0', 16); endp = tp + 16; colonp = NULL; /* Leading :: requires some special handling. */ if (*src == ':') if (*++src != ':') return (0); curtok = src; saw_xdigit = 0; val = 0; while ((ch = tolower (*src++)) != '\0') { const char *pch; pch = strchr(xdigits, ch); if (pch != NULL) { val <<= 4; val |= (pch - xdigits); if (val > 0xffff) return (0); saw_xdigit = 1; continue; } if (ch == ':') { curtok = src; if (!saw_xdigit) { if (colonp) return (0); colonp = tp; continue; } else if (*src == '\0') { return (0); } if (tp + 2 > endp) return (0); *tp++ = (u_char) (val >> 8) & 0xff; *tp++ = (u_char) val & 0xff; saw_xdigit = 0; val = 0; continue; } if (ch == '.' && ((tp + 4) <= endp) && inet_pton4(curtok, tp) > 0) { tp += 4; saw_xdigit = 0; break; /* '\0' was seen by inet_pton4(). */ } return (0); } if (saw_xdigit) { if (tp + 2 > endp) return (0); *tp++ = (u_char) (val >> 8) & 0xff; *tp++ = (u_char) val & 0xff; } if (colonp != NULL) { /* * Since some memmove()'s erroneously fail to handle * overlapping regions, we'll do the shift by hand. */ const int n = tp - colonp; int i; if (tp == endp) return (0); for (i = 1; i <= n; i++) { endp[- i] = colonp[n - i]; colonp[n - i] = 0; } tp = endp; } if (tp != endp) return (0); memcpy(dst, tmp, 16); return (1); } #endif /* INET_IPV6 */ /* char * * inet_ntop(af, src, dst, size) * convert a network format address to presentation format. * return: * pointer to presentation format address (`dst'), or NULL (see errno). * author: * Paul Vixie, 1996. */ extern const char * inet_ntop(af, src, dst, size) int af; const void *src; char *dst; socklen_t size; { switch (af) { case AF_INET: return (inet_ntop4(src, dst, size)); #ifdef INET_IPV6 case AF_INET6: return (inet_ntop6(src, dst, size)); #endif default: __set_errno (EAFNOSUPPORT); return (NULL); } /* NOTREACHED */ } /* int * inet_pton(af, src, dst) * convert from presentation format (which usually means ASCII printable) * to network format (which is usually some kind of binary format). * return: * 1 if the address was valid for the specified address family * 0 if the address wasn't valid (`dst' is untouched in this case) * -1 if some other error occurred (`dst' is untouched in this case, too) * author: * Paul Vixie, 1996. */ extern int inet_pton(af, src, dst) int af; const char *src; void *dst; { switch (af) { case AF_INET: return (inet_pton4(src, dst)); #ifdef INET_IPV6 case AF_INET6: return (inet_pton6(src, dst)); #endif default: __set_errno (EAFNOSUPPORT); return (-1); } /* NOTREACHED */ }