/* * Copyright (c) 1996 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. */ /* * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #include "lint.h" #include #include #include #include #include #include #include #include #include #include static const char *inet_ntop4(const uchar_t *, char *, socklen_t); static const char *inet_ntop6(const uchar_t *, char *, socklen_t); /* * 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). */ const char * inet_ntop(int af, const void *src, char *dst, socklen_t size) { switch (af) { case AF_INET: return (inet_ntop4(src, dst, size)); case AF_INET6: return (inet_ntop6(src, dst, size)); default: errno = EAFNOSUPPORT; return (NULL); } /* NOTREACHED */ } /* * const char * * inet_ntop4(src, dst, size) * format an IPv4 address, more or less like inet_ntoa() * return: * `dst' (as a const) * notes: * (1) uses no statics * (2) takes a uchar_t* not an in_addr as input */ static const char * inet_ntop4(const uchar_t *src, char *dst, socklen_t size) { static const char fmt[] = "%u.%u.%u.%u"; char tmp[sizeof ("255.255.255.255")]; if (sprintf(tmp, fmt, src[0], src[1], src[2], src[3]) > size) { errno = ENOSPC; return (NULL); } (void) strcpy(dst, tmp); return (dst); } /* * const char * * inet_ntop6(src, dst, size) * convert IPv6 binary address into presentation (printable) format */ #define INADDRSZ 4 #define IN6ADDRSZ 16 #define INT16SZ 2 static const char * inet_ntop6(const uchar_t *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; uint_t words[IN6ADDRSZ / INT16SZ]; int i; /* * Preprocess: * Copy the input (bytewise) array into a wordwise array. * Find the longest run of 0x00's in src[] for :: shorthanding. */ (void) memset(words, '\0', sizeof (words)); for (i = 0; i < IN6ADDRSZ; i++) words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3)); best.base = -1; cur.base = -1; for (i = 0; i < (IN6ADDRSZ / INT16SZ); 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 < (IN6ADDRSZ / INT16SZ); 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) == (IN6ADDRSZ / INT16SZ)) *tp++ = ':'; *tp++ = '\0'; /* * Check for overflow, copy, and we're done. */ if ((int)(tp - tmp) > size) { errno = ENOSPC; return (NULL); } (void) strcpy(dst, tmp); return (dst); }