a752c7ab
 elopes
add first test an...
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
/*
* Copyright (c) 1996 by Internet Software Consortium.
* Copyright (c) 2015 by Martine Lenders <mlenders@inf.fu-berlin.de>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
/**
* @ingroup net_ipv6_addr
* @{
*
* @file
*
* @author Paul Vixie
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#include <inttypes.h>
#include <string.h>
#include "byteorder.h"
#include "net/ipv4/addr.h"
#include "net/ipv6/addr.h"
/* Length of an IPv6 address in 16-bit words */
#define IPV6_ADDR_WORD_LEN (sizeof(ipv6_addr_t) / sizeof(uint16_t))
#define HEX_L "0123456789abcdef"
/* based on inet_ntop6() by Paul Vixie */
char *ipv6_addr_to_str(char *result, const ipv6_addr_t *addr, uint8_t result_len)
{
char tmp[IPV6_ADDR_MAX_STR_LEN], *tp;
struct {
int16_t base, len;
} best = { -1, 0}, cur = { -1, 0};
if ((result == NULL) || (addr == NULL)) {
return NULL;
}
/*
* Preprocess:
* Find the longest run of 0x0000's in address for :: shorthanding.
*/
for (uint8_t i = 0; i < IPV6_ADDR_WORD_LEN; i++) {
if (addr->u16[i].u16 == 0) {
if (cur.base == -1) {
cur.base = i;
cur.len = 1;
}
else {
cur.len++;
}
}
else {
if (cur.base != -1) {
if (best.base == -1 || cur.len > best.len) {
best = cur;
}
cur.base = -1;
}
}
}
if (cur.base != -1) {
if (best.base == -1 || cur.len > best.len) {
best = cur;
}
}
if (best.base != -1 && best.len < 2) {
best.base = -1;
}
/*
* Format the result.
*/
tp = tmp;
for (int i = 0; i < ((int)IPV6_ADDR_WORD_LEN);) {
/* Are we inside the best run of 0x00's? */
if (i == best.base) {
*tp++ = ':';
i += best.len;
continue;
}
/* Are we following an initial run of 0x00s or any real hex? */
if (i != 0) {
*tp++ = ':';
}
#ifdef MODULE_IPV4_ADDR
/* Is this address an encapsulated IPv4? */
if (i == 6 && best.base == 0 &&
(best.len == 6 || (best.len == 5 && addr->u16[5].u16 == 0xffff))) {
if (!ipv4_addr_to_str(tp, (const ipv4_addr_t *)&addr->u32[3],
sizeof(tmp) - (tp - tmp))) {
return (NULL);
}
tp += strlen(tp);
break;
}
#endif
if ((addr->u16[i].u8[0] & 0xf0) != 0x00) {
*tp++ = HEX_L[addr->u16[i].u8[0] >> 4];
*tp++ = HEX_L[addr->u16[i].u8[0] & 0x0f];
*tp++ = HEX_L[addr->u16[i].u8[1] >> 4];
}
else if ((addr->u16[i].u8[0] & 0x0f) != 0x00) {
*tp++ = HEX_L[addr->u16[i].u8[0] & 0x0f];
*tp++ = HEX_L[addr->u16[i].u8[1] >> 4];
}
else if ((addr->u16[i].u8[1] & 0xf0) != 0x00) {
*tp++ = HEX_L[addr->u16[i].u8[1] >> 4];
}
*tp++ = HEX_L[addr->u16[i].u8[1] & 0xf];
i++;
}
/* Was it a trailing run of 0x00's? */
if (best.base != -1 && (best.base + best.len) == IPV6_ADDR_WORD_LEN) {
*tp++ = ':';
}
*tp++ = '\0';
/*
* Check for overflow, copy, and we're done.
*/
if ((size_t)(tp - tmp) > result_len) {
return NULL;
}
strcpy(result, tmp);
return result;
}
/**
* @}
*/
|