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
|
#include "u.h"
#include "lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "ip.h"
enum
{
IPaddrlen= 16,
IPv4addrlen= 4,
IPv4off= 12,
IPllen= 4,
};
extern int fmtstrcpy(Fmt*, char*);
/*
* prefix of all v4 addresses
*/
uchar v4prefix[IPaddrlen] = {
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0xff, 0xff,
0, 0, 0, 0
};
enum
{
Isprefix= 16,
};
uchar prefixvals[256] =
{
[0x00] 0 | Isprefix,
[0x80] 1 | Isprefix,
[0xC0] 2 | Isprefix,
[0xE0] 3 | Isprefix,
[0xF0] 4 | Isprefix,
[0xF8] 5 | Isprefix,
[0xFC] 6 | Isprefix,
[0xFE] 7 | Isprefix,
[0xFF] 8 | Isprefix,
};
void
hnputl(void *p, uint v)
{
uchar *a;
a = p;
a[0] = v>>24;
a[1] = v>>16;
a[2] = v>>8;
a[3] = v;
}
int
eipfmt(Fmt *f)
{
char buf[5*8];
static char *efmt = "%.2lux%.2lux%.2lux%.2lux%.2lux%.2lux";
static char *ifmt = "%d.%d.%d.%d";
uchar *p, ip[16];
ulong *lp;
ushort s;
int i, j, n, eln, eli;
switch(f->r) {
case 'E': /* Ethernet address */
p = va_arg(f->args, uchar*);
snprint(buf, sizeof buf, efmt, p[0], p[1], p[2], p[3], p[4], p[5]);
return fmtstrcpy(f, buf);
case 'I': /* Ip address */
p = va_arg(f->args, uchar*);
common:
if(memcmp(p, v4prefix, 12) == 0){
snprint(buf, sizeof buf, ifmt, p[12], p[13], p[14], p[15]);
return fmtstrcpy(f, buf);
}
/* find longest elision */
eln = eli = -1;
for(i = 0; i < 16; i += 2){
for(j = i; j < 16; j += 2)
if(p[j] != 0 || p[j+1] != 0)
break;
if(j > i && j - i > eln){
eli = i;
eln = j - i;
}
}
/* print with possible elision */
n = 0;
for(i = 0; i < 16; i += 2){
if(i == eli){
n += sprint(buf+n, "::");
i += eln;
if(i >= 16)
break;
} else if(i != 0)
n += sprint(buf+n, ":");
s = (p[i]<<8) + p[i+1];
n += sprint(buf+n, "%ux", s);
}
return fmtstrcpy(f, buf);
case 'i': /* v6 address as 4 longs */
lp = va_arg(f->args, ulong*);
for(i = 0; i < 4; i++)
hnputl(ip+4*i, *lp++);
p = ip;
goto common;
case 'V': /* v4 ip address */
p = va_arg(f->args, uchar*);
snprint(buf, sizeof buf, ifmt, p[0], p[1], p[2], p[3]);
return fmtstrcpy(f, buf);
case 'M': /* ip mask */
p = va_arg(f->args, uchar*);
/* look for a prefix mask */
for(i = 0; i < 16; i++)
if(p[i] != 0xff)
break;
if(i < 16){
if((prefixvals[p[i]] & Isprefix) == 0)
goto common;
for(j = i+1; j < 16; j++)
if(p[j] != 0)
goto common;
n = 8*i + (prefixvals[p[i]] & ~Isprefix);
} else
n = 8*16;
/* got one, use /xx format */
snprint(buf, sizeof buf, "/%d", n);
return fmtstrcpy(f, buf);
}
return fmtstrcpy(f, "(eipfmt)");
}
|
