128 lines
5.0 KiB
C
128 lines
5.0 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2014 Tom Gundersen
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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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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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <net/ethernet.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include "ether-addr-util.h"
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#include "macro.h"
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#include "string-util.h"
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char* ether_addr_to_string(const struct ether_addr *addr, char buffer[ETHER_ADDR_TO_STRING_MAX]) {
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assert(addr);
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assert(buffer);
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/* Like ether_ntoa() but uses %02x instead of %x to print
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* ethernet addresses, which makes them look less funny. Also,
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* doesn't use a static buffer. */
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sprintf(buffer, "%02x:%02x:%02x:%02x:%02x:%02x",
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addr->ether_addr_octet[0],
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addr->ether_addr_octet[1],
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addr->ether_addr_octet[2],
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addr->ether_addr_octet[3],
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addr->ether_addr_octet[4],
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addr->ether_addr_octet[5]);
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return buffer;
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}
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bool ether_addr_equal(const struct ether_addr *a, const struct ether_addr *b) {
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assert(a);
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assert(b);
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return a->ether_addr_octet[0] == b->ether_addr_octet[0] &&
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a->ether_addr_octet[1] == b->ether_addr_octet[1] &&
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a->ether_addr_octet[2] == b->ether_addr_octet[2] &&
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a->ether_addr_octet[3] == b->ether_addr_octet[3] &&
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a->ether_addr_octet[4] == b->ether_addr_octet[4] &&
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a->ether_addr_octet[5] == b->ether_addr_octet[5];
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}
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int ether_addr_from_string(const char *s, struct ether_addr *ret, size_t *offset) {
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size_t pos = 0, n, field;
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char sep = '\0';
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const char *hex = HEXDIGITS, *hexoff;
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size_t x;
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bool touched;
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#define parse_fields(v) \
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for (field = 0; field < ELEMENTSOF(v); field++) { \
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touched = false; \
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for (n = 0; n < (2 * sizeof(v[0])); n++) { \
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if (s[pos] == '\0') \
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break; \
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hexoff = strchr(hex, s[pos]); \
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if (!hexoff) \
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break; \
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assert(hexoff >= hex); \
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x = hexoff - hex; \
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if (x >= 16) \
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x -= 6; /* A-F */ \
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assert(x < 16); \
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touched = true; \
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v[field] <<= 4; \
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v[field] += x; \
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pos++; \
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} \
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if (!touched) \
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return -EINVAL; \
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if (field < (ELEMENTSOF(v)-1)) { \
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if (s[pos] != sep) \
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return -EINVAL; \
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else \
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pos++; \
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} \
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}
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assert(s);
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assert(ret);
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sep = s[strspn(s, hex)];
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if (sep == '\n')
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return -EINVAL;
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if (!strchr(":.-", sep))
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return -EINVAL;
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if (sep == '.') {
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uint16_t shorts[3] = { 0 };
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parse_fields(shorts);
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for (n = 0; n < ELEMENTSOF(shorts); n++) {
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ret->ether_addr_octet[2*n] = ((shorts[n] & (uint16_t)0xff00) >> 8);
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ret->ether_addr_octet[2*n + 1] = (shorts[n] & (uint16_t)0x00ff);
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}
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} else {
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struct ether_addr out = { .ether_addr_octet = { 0 } };
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parse_fields(out.ether_addr_octet);
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for (n = 0; n < ELEMENTSOF(out.ether_addr_octet); n++)
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ret->ether_addr_octet[n] = out.ether_addr_octet[n];
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}
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if (offset)
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*offset = pos;
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return 0;
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}
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