From 632aef92d7c7dd96cfb57c592962d37bb6a68f71 Mon Sep 17 00:00:00 2001 From: Sepherosa Ziehau Date: Sun, 16 Nov 2014 14:33:42 +0800 Subject: [PATCH] libkern: Add inet_ntop() Taken-from: FreeBSD r213103 --- sys/conf/files | 1 + sys/libkern/inet_ntop.c | 181 ++++++++++++++++++++++++++++++++++++++++ sys/netinet/in.h | 2 + 3 files changed, 184 insertions(+) create mode 100644 sys/libkern/inet_ntop.c diff --git a/sys/conf/files b/sys/conf/files index f87e76d295..9317ed9d4f 100644 --- a/sys/conf/files +++ b/sys/conf/files @@ -1747,6 +1747,7 @@ libkern/icrc32.c standard libkern/linux_idr.c standard libkern/index.c standard libkern/inet_ntoa.c standard +libkern/inet_ntop.c standard libkern/mcount.c optional profiling-routine libkern/memmove.c standard libkern/memcchr.c standard diff --git a/sys/libkern/inet_ntop.c b/sys/libkern/inet_ntop.c new file mode 100644 index 0000000000..ee51170214 --- /dev/null +++ b/sys/libkern/inet_ntop.c @@ -0,0 +1,181 @@ +/* + * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") + * 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 ISC DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC 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. + * + * $Id: inet_ntop.c,v 1.3.18.2 2005/11/03 23:02:22 marka Exp $ + * FreeBSD r213103 + */ + +#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. + */ + +static char *inet_ntop4(const u_char *src, char *dst, socklen_t size); +static char *inet_ntop6(const u_char *src, char *dst, socklen_t size); + +/* 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. + */ +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: + return (NULL); + } + /* NOTREACHED */ +} + +/* 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 char * +inet_ntop4(const u_char *src, char *dst, socklen_t size) +{ + static const char fmt[] = "%u.%u.%u.%u"; + char tmp[sizeof "255.255.255.255"]; + int l; + + l = ksnprintf(tmp, sizeof(tmp), fmt, src[0], src[1], src[2], src[3]); + if (l <= 0 || (socklen_t) l >= size) { + return (NULL); + } + strlcpy(dst, tmp, size); + return (dst); +} + +/* const char * + * inet_ntop6(src, dst, size) + * convert IPv6 binary address into presentation (printable) format + * author: + * Paul Vixie, 1996. + */ +static char * +inet_ntop6(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; +#define NS_IN6ADDRSZ 16 +#define NS_INT16SZ 2 + u_int words[NS_IN6ADDRSZ / NS_INT16SZ]; + 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 < NS_IN6ADDRSZ; i++) + words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3)); + best.base = -1; + best.len = 0; + cur.base = -1; + cur.len = 0; + for (i = 0; i < (NS_IN6ADDRSZ / NS_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 < (NS_IN6ADDRSZ / NS_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 == 7 && words[7] != 0x0001) || + (best.len == 5 && words[5] == 0xffff))) { + if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp))) + return (NULL); + tp += strlen(tp); + break; + } + tp += ksprintf(tp, "%x", words[i]); + } + /* Was it a trailing run of 0x00's? */ + if (best.base != -1 && (best.base + best.len) == + (NS_IN6ADDRSZ / NS_INT16SZ)) + *tp++ = ':'; + *tp++ = '\0'; + + /* + * Check for overflow, copy, and we're done. + */ + if ((socklen_t)(tp - tmp) > size) { + return (NULL); + } + strcpy(dst, tmp); + return (dst); +} + +/*! \file */ diff --git a/sys/netinet/in.h b/sys/netinet/in.h index 9d28280b3a..37b293a64d 100644 --- a/sys/netinet/in.h +++ b/sys/netinet/in.h @@ -525,6 +525,8 @@ int in_broadcast (struct in_addr, struct ifnet *); int in_canforward (struct in_addr); int in_localaddr (struct in_addr); char *inet_ntoa (struct in_addr); /* in libkern */ +char *inet_ntop(int, const void * __restrict, char * __restrict, + socklen_t); /* in libkern */ int prison_replace_wildcards (struct thread *td, struct sockaddr *ip); int prison_remote_ip (struct thread *td, struct sockaddr *ip); -- 2.41.0