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600462834f
In many files there are header comments that contain an Author: statement, supposedly reflecting who originally wrote the code. In a large collaborative project like libvirt, any non-trivial file will have been modified by a large number of different contributors. IOW, the Author: comments are quickly out of date, omitting people who have made significant contribitions. In some places Author: lines have been added despite the person merely being responsible for creating the file by moving existing code out of another file. IOW, the Author: lines give an incorrect record of authorship. With this all in mind, the comments are useless as a means to identify who to talk to about code in a particular file. Contributors will always be better off using 'git log' and 'git blame' if they need to find the author of a particular bit of code. This commit thus deletes all Author: comments from the source and adds a rule to prevent them reappearing. The Copyright headers are similarly misleading and inaccurate, however, we cannot delete these as they have legal meaning, despite being largely inaccurate. In addition only the copyright holder is permitted to change their respective copyright statement. Reviewed-by: Erik Skultety <eskultet@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
256 lines
6.1 KiB
C
256 lines
6.1 KiB
C
/*
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* virmacaddr.c: MAC address handling
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*
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* Copyright (C) 2006-2013 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include "c-ctype.h"
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#include "virmacaddr.h"
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#include "virrandom.h"
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#include "virutil.h"
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static const unsigned char virMacAddrBroadcastAddrRaw[VIR_MAC_BUFLEN] =
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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/* Compare two MAC addresses, ignoring differences in case,
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* as well as leading zeros.
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*/
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int
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virMacAddrCompare(const char *p, const char *q)
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{
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unsigned char c, d;
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do {
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while (*p == '0' && c_isxdigit(p[1]))
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++p;
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while (*q == '0' && c_isxdigit(q[1]))
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++q;
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c = c_tolower(*p);
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d = c_tolower(*q);
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if (c == 0 || d == 0)
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break;
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++p;
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++q;
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} while (c == d);
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if (UCHAR_MAX <= INT_MAX)
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return c - d;
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/* On machines where 'char' and 'int' are types of the same size, the
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difference of two 'unsigned char' values - including the sign bit -
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doesn't fit in an 'int'. */
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return c > d ? 1 : c < d ? -1 : 0;
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}
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/**
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* virMacAddrCmp:
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* @mac1: pointer to 1st MAC address
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* @mac2: pointer to 2nd MAC address
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*
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* Return 0 if MAC addresses are equal,
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* < 0 if mac1 < mac2,
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* > 0 if mac1 > mac2
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*/
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int
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virMacAddrCmp(const virMacAddr *mac1, const virMacAddr *mac2)
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{
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return memcmp(mac1->addr, mac2->addr, VIR_MAC_BUFLEN);
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}
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/**
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* virMacAddrCmpRaw:
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* @mac1: pointer to 1st MAC address
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* @mac2: pointer to 2nd MAC address in plain buffer
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*
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* Return 0 if MAC addresses are equal,
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* < 0 if mac1 < mac2,
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* > 0 if mac1 > mac2
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*/
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int
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virMacAddrCmpRaw(const virMacAddr *mac1,
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const unsigned char mac2[VIR_MAC_BUFLEN])
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{
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return memcmp(mac1->addr, mac2, VIR_MAC_BUFLEN);
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}
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/**
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* virMacAddrSet
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* @dst: pointer to destination
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* @src: pointer to source
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*
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* Copy src to dst
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*/
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void
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virMacAddrSet(virMacAddrPtr dst, const virMacAddr *src)
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{
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memcpy(dst, src, sizeof(*src));
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}
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/**
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* virMacAddrSetRaw
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* @dst: pointer to destination to hold MAC address
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* @src: raw MAC address data
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*
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* Set the MAC address to the given value
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*/
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void
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virMacAddrSetRaw(virMacAddrPtr dst, const unsigned char src[VIR_MAC_BUFLEN])
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{
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memcpy(dst->addr, src, VIR_MAC_BUFLEN);
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}
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/**
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* virMacAddrGetRaw
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* @src: pointer to MAC address
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* @dst: pointer to raw memory to write MAC address into
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*
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* Copies the MAC address into raw memory
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*/
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void
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virMacAddrGetRaw(const virMacAddr *src, unsigned char dst[VIR_MAC_BUFLEN])
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{
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memcpy(dst, src->addr, VIR_MAC_BUFLEN);
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}
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/**
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* virMacAddrParse:
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* @str: string representation of MAC address, e.g., "0:1E:FC:E:3a:CB"
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* @addr: 6-byte MAC address
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*
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* Parse a MAC address
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*
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* Return 0 upon success, or -1 in case of error.
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*/
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int
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virMacAddrParse(const char* str, virMacAddrPtr addr)
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{
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size_t i;
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errno = 0;
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for (i = 0; i < VIR_MAC_BUFLEN; i++) {
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char *end_ptr;
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unsigned long result;
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/* This is solely to avoid accepting the leading
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* space or "+" that strtoul would otherwise accept.
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*/
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if (!c_isxdigit(*str))
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break;
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result = strtoul(str, &end_ptr, 16); /* exempt from syntax-check */
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if ((end_ptr - str) < 1 || 2 < (end_ptr - str) ||
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(errno != 0) ||
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(0xFF < result))
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break;
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addr->addr[i] = (unsigned char) result;
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if ((i == 5) && (*end_ptr <= ' '))
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return 0;
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if (*end_ptr != ':')
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break;
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str = end_ptr + 1;
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}
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return -1;
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}
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/* virMacAddrFormat
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* Converts the binary mac address in addr into a NULL-terminated
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* character string in str. It is assumed that the memory pointed to
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* by str is at least VIR_MAC_STRING_BUFLEN bytes long.
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*
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* Returns a pointer to the resulting character string.
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*/
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const char *
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virMacAddrFormat(const virMacAddr *addr,
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char *str)
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{
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snprintf(str, VIR_MAC_STRING_BUFLEN,
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"%02x:%02x:%02x:%02x:%02x:%02x",
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addr->addr[0], addr->addr[1], addr->addr[2],
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addr->addr[3], addr->addr[4], addr->addr[5]);
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str[VIR_MAC_STRING_BUFLEN-1] = '\0';
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return str;
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}
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/**
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* virMacAddrParseHex:
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* @str: string hexadecimal representation of MAC address, e.g., "F801EFCE3aCB"
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* @addr: 6-byte MAC address
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*
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* Parse the hexadecimal representation of a MAC address
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*
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* Return 0 upon success, or -1 in case of error.
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*/
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int
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virMacAddrParseHex(const char *str, virMacAddrPtr addr)
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{
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size_t i;
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if (strspn(str, "0123456789abcdefABCDEF") != VIR_MAC_HEXLEN ||
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str[VIR_MAC_HEXLEN])
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return -1;
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for (i = 0; i < VIR_MAC_BUFLEN; i++)
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addr->addr[i] = (virHexToBin(str[2 * i]) << 4 |
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virHexToBin(str[2 * i + 1]));
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return 0;
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}
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void virMacAddrGenerate(const unsigned char prefix[VIR_MAC_PREFIX_BUFLEN],
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virMacAddrPtr addr)
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{
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addr->addr[0] = prefix[0];
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addr->addr[1] = prefix[1];
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addr->addr[2] = prefix[2];
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addr->addr[3] = virRandomBits(8);
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addr->addr[4] = virRandomBits(8);
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addr->addr[5] = virRandomBits(8);
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}
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/* The low order bit of the first byte is the "multicast" bit. */
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bool
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virMacAddrIsMulticast(const virMacAddr *mac)
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{
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return !!(mac->addr[0] & 1);
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}
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bool
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virMacAddrIsUnicast(const virMacAddr *mac)
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{
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return !(mac->addr[0] & 1);
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}
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bool
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virMacAddrIsBroadcastRaw(const unsigned char s[VIR_MAC_BUFLEN])
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{
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return memcmp(virMacAddrBroadcastAddrRaw, s, sizeof(*s)) == 0;
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}
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void
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virMacAddrFree(virMacAddrPtr addr)
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{
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VIR_FREE(addr);
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}
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