mirror of
https://github.com/systemd/systemd.git
synced 2024-11-06 16:59:03 +03:00
dd4d201ab1
This isn't quite symmetrical to in_addr_from_string() because it also returns an offset indicating how much of the string was consumed by the matched pattern. This offset reporting is needed for either of the following use cases: * verifying the lack of trailing garbage after such an address * parsing subsequent data from the same string
126 lines
4.9 KiB
C
126 lines
4.9 KiB
C
/***
|
|
This file is part of systemd.
|
|
|
|
Copyright 2014 Tom Gundersen
|
|
|
|
systemd is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
systemd is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
***/
|
|
|
|
#include <net/ethernet.h>
|
|
#include <stdio.h>
|
|
#include <sys/types.h>
|
|
|
|
#include "ether-addr-util.h"
|
|
#include "macro.h"
|
|
#include "string-util.h"
|
|
|
|
char* ether_addr_to_string(const struct ether_addr *addr, char buffer[ETHER_ADDR_TO_STRING_MAX]) {
|
|
assert(addr);
|
|
assert(buffer);
|
|
|
|
/* Like ether_ntoa() but uses %02x instead of %x to print
|
|
* ethernet addresses, which makes them look less funny. Also,
|
|
* doesn't use a static buffer. */
|
|
|
|
sprintf(buffer, "%02x:%02x:%02x:%02x:%02x:%02x",
|
|
addr->ether_addr_octet[0],
|
|
addr->ether_addr_octet[1],
|
|
addr->ether_addr_octet[2],
|
|
addr->ether_addr_octet[3],
|
|
addr->ether_addr_octet[4],
|
|
addr->ether_addr_octet[5]);
|
|
|
|
return buffer;
|
|
}
|
|
|
|
bool ether_addr_equal(const struct ether_addr *a, const struct ether_addr *b) {
|
|
assert(a);
|
|
assert(b);
|
|
|
|
return a->ether_addr_octet[0] == b->ether_addr_octet[0] &&
|
|
a->ether_addr_octet[1] == b->ether_addr_octet[1] &&
|
|
a->ether_addr_octet[2] == b->ether_addr_octet[2] &&
|
|
a->ether_addr_octet[3] == b->ether_addr_octet[3] &&
|
|
a->ether_addr_octet[4] == b->ether_addr_octet[4] &&
|
|
a->ether_addr_octet[5] == b->ether_addr_octet[5];
|
|
}
|
|
|
|
int ether_addr_from_string(const char *s, struct ether_addr *ret, size_t *offset) {
|
|
size_t pos = 0, n, field;
|
|
char sep = '\0';
|
|
const char *hex = HEXDIGITS, *hexoff;
|
|
size_t x;
|
|
bool touched;
|
|
|
|
#define parse_fields(v) \
|
|
for (field = 0; field < ELEMENTSOF(v); field++) { \
|
|
touched = false; \
|
|
for (n = 0; n < (2 * sizeof(v[0])); n++) { \
|
|
if (s[pos] == '\0') \
|
|
break; \
|
|
hexoff = strchr(hex, s[pos]); \
|
|
if (hexoff == NULL) \
|
|
break; \
|
|
assert(hexoff >= hex); \
|
|
x = hexoff - hex; \
|
|
if (x >= 16) \
|
|
x -= 6; /* A-F */ \
|
|
assert(x < 16); \
|
|
touched = true; \
|
|
v[field] <<= 4; \
|
|
v[field] += x; \
|
|
pos++; \
|
|
} \
|
|
if (!touched) \
|
|
return -EINVAL; \
|
|
if (field < (ELEMENTSOF(v)-1)) { \
|
|
if (s[pos] != sep) \
|
|
return -EINVAL; \
|
|
else \
|
|
pos++; \
|
|
} \
|
|
}
|
|
|
|
assert(s);
|
|
assert(ret);
|
|
|
|
sep = s[strspn(s, hex)];
|
|
if (sep == '\n')
|
|
return -EINVAL;
|
|
if (strchr(":.-", sep) == NULL)
|
|
return -EINVAL;
|
|
|
|
if (sep == '.') {
|
|
uint16_t shorts[3] = { 0 };
|
|
|
|
parse_fields(shorts);
|
|
|
|
for (n = 0; n < ELEMENTSOF(shorts); n++) {
|
|
ret->ether_addr_octet[2*n] = ((shorts[n] & (uint16_t)0xff00) >> 8);
|
|
ret->ether_addr_octet[2*n + 1] = (shorts[n] & (uint16_t)0x00ff);
|
|
}
|
|
} else {
|
|
struct ether_addr out = { .ether_addr_octet = { 0 } };
|
|
|
|
parse_fields(out.ether_addr_octet);
|
|
|
|
for (n = 0; n < ELEMENTSOF(out.ether_addr_octet); n++)
|
|
ret->ether_addr_octet[n] = out.ether_addr_octet[n];
|
|
}
|
|
|
|
if (offset)
|
|
*offset = pos;
|
|
return 0;
|
|
}
|