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81a56d6f LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2014 Tom Gundersen | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
11c3a366 | 20 | #include <net/ethernet.h> |
81a56d6f | 21 | #include <stdio.h> |
11c3a366 | 22 | #include <sys/types.h> |
81a56d6f LP |
23 | |
24 | #include "ether-addr-util.h" | |
25 | #include "macro.h" | |
dd4d201a | 26 | #include "string-util.h" |
81a56d6f LP |
27 | |
28 | char* ether_addr_to_string(const struct ether_addr *addr, char buffer[ETHER_ADDR_TO_STRING_MAX]) { | |
29 | assert(addr); | |
30 | assert(buffer); | |
31 | ||
32 | /* Like ether_ntoa() but uses %02x instead of %x to print | |
33 | * ethernet addresses, which makes them look less funny. Also, | |
34 | * doesn't use a static buffer. */ | |
35 | ||
36 | sprintf(buffer, "%02x:%02x:%02x:%02x:%02x:%02x", | |
37 | addr->ether_addr_octet[0], | |
38 | addr->ether_addr_octet[1], | |
39 | addr->ether_addr_octet[2], | |
40 | addr->ether_addr_octet[3], | |
41 | addr->ether_addr_octet[4], | |
42 | addr->ether_addr_octet[5]); | |
43 | ||
44 | return buffer; | |
45 | } | |
b553a6b1 | 46 | |
b553a6b1 LP |
47 | bool ether_addr_equal(const struct ether_addr *a, const struct ether_addr *b) { |
48 | assert(a); | |
49 | assert(b); | |
50 | ||
51 | return a->ether_addr_octet[0] == b->ether_addr_octet[0] && | |
52 | a->ether_addr_octet[1] == b->ether_addr_octet[1] && | |
53 | a->ether_addr_octet[2] == b->ether_addr_octet[2] && | |
54 | a->ether_addr_octet[3] == b->ether_addr_octet[3] && | |
55 | a->ether_addr_octet[4] == b->ether_addr_octet[4] && | |
56 | a->ether_addr_octet[5] == b->ether_addr_octet[5]; | |
57 | } | |
dd4d201a DKG |
58 | |
59 | int ether_addr_from_string(const char *s, struct ether_addr *ret, size_t *offset) { | |
60 | size_t pos = 0, n, field; | |
61 | char sep = '\0'; | |
62 | const char *hex = HEXDIGITS, *hexoff; | |
63 | size_t x; | |
64 | bool touched; | |
65 | ||
66 | #define parse_fields(v) \ | |
67 | for (field = 0; field < ELEMENTSOF(v); field++) { \ | |
68 | touched = false; \ | |
69 | for (n = 0; n < (2 * sizeof(v[0])); n++) { \ | |
70 | if (s[pos] == '\0') \ | |
71 | break; \ | |
72 | hexoff = strchr(hex, s[pos]); \ | |
73 | if (hexoff == NULL) \ | |
74 | break; \ | |
75 | assert(hexoff >= hex); \ | |
76 | x = hexoff - hex; \ | |
77 | if (x >= 16) \ | |
78 | x -= 6; /* A-F */ \ | |
79 | assert(x < 16); \ | |
80 | touched = true; \ | |
81 | v[field] <<= 4; \ | |
82 | v[field] += x; \ | |
83 | pos++; \ | |
84 | } \ | |
85 | if (!touched) \ | |
86 | return -EINVAL; \ | |
87 | if (field < (ELEMENTSOF(v)-1)) { \ | |
88 | if (s[pos] != sep) \ | |
89 | return -EINVAL; \ | |
90 | else \ | |
91 | pos++; \ | |
92 | } \ | |
93 | } | |
94 | ||
95 | assert(s); | |
96 | assert(ret); | |
97 | ||
98 | sep = s[strspn(s, hex)]; | |
99 | if (sep == '\n') | |
100 | return -EINVAL; | |
101 | if (strchr(":.-", sep) == NULL) | |
102 | return -EINVAL; | |
103 | ||
104 | if (sep == '.') { | |
105 | uint16_t shorts[3] = { 0 }; | |
106 | ||
107 | parse_fields(shorts); | |
108 | ||
109 | for (n = 0; n < ELEMENTSOF(shorts); n++) { | |
110 | ret->ether_addr_octet[2*n] = ((shorts[n] & (uint16_t)0xff00) >> 8); | |
111 | ret->ether_addr_octet[2*n + 1] = (shorts[n] & (uint16_t)0x00ff); | |
112 | } | |
113 | } else { | |
114 | struct ether_addr out = { .ether_addr_octet = { 0 } }; | |
115 | ||
116 | parse_fields(out.ether_addr_octet); | |
117 | ||
118 | for (n = 0; n < ELEMENTSOF(out.ether_addr_octet); n++) | |
119 | ret->ether_addr_octet[n] = out.ether_addr_octet[n]; | |
120 | } | |
121 | ||
122 | if (offset) | |
123 | *offset = pos; | |
124 | return 0; | |
125 | } |