113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/* $NetBSD: dl_print.c,v 1.8 2021/05/27 13:40:38 christos Exp $ */
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/*-
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* Copyright (c) 2014 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#ifdef _KERNEL
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__KERNEL_RCSID(0, "$NetBSD: dl_print.c,v 1.8 2021/05/27 13:40:38 christos Exp $");
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#include <sys/systm.h>
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#else
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__RCSID("$NetBSD: dl_print.c,v 1.8 2021/05/27 13:40:38 christos Exp $");
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#include <stdio.h>
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static const char hexdigits[] = "0123456789abcdef";
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#endif
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#include <net/if_dl.h>
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static int
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lla_snprintf1(char *dst, size_t dst_len, const void *src, size_t src_len)
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{
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char *dp;
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const uint8_t *sp, *ep;
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dp = dst;
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sp = (const uint8_t *)src;
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ep = sp + src_len;
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while (sp < ep) {
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if (dst_len-- == 0)
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break;
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*dp++ = hexdigits[(*sp) >> 4];
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if (dst_len-- == 0)
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break;
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*dp++ = hexdigits[(*sp++) & 0xf];
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if (dst_len-- == 0)
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break;
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*dp++ = ':';
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}
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if (dp != dst)
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*--dp = '\0';
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return src_len ? (int)(src_len * 3) - 1 : 0;
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}
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char *
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lla_snprintf(char *dst, size_t dst_len, const void *src, size_t src_len)
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{
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(void)lla_snprintf1(dst, dst_len, src, src_len);
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return dst;
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}
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#define clip(a, b) ((a) > (size_t)(b) ? (a) - (size_t)(b) : 0)
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int
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dl_print(char *buf, size_t len, const struct dl_addr *dl)
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{
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int l = snprintf(buf, len, "%.*s/%hhu#",
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(int)dl->dl_nlen, dl->dl_data, dl->dl_type);
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if (l == -1)
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return l;
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int ll = lla_snprintf1(buf + l, clip(len, l),
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dl->dl_data + dl->dl_nlen, dl->dl_alen);
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if (ll == -1)
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return ll;
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return ll + l;
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}
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int
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sdl_print(char *buf, size_t len, const void *v)
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{
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const struct sockaddr_dl *sdl = v;
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if (sdl->sdl_slen == 0 && sdl->sdl_nlen == 0 && sdl->sdl_alen == 0)
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return snprintf(buf, len, "link#%hu", sdl->sdl_index);
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if (len > 0) {
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buf[0] = '[';
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len--;
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}
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int l = dl_print(buf + 1, len, &sdl->sdl_addr);
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if (l == -1)
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return l;
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l++;
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len++;
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int ll = snprintf(buf + l, clip(len, l), "]:%hu", sdl->sdl_index);
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if (ll == -1)
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return ll;
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return ll + l;
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}
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