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
159
160
161
|
/*
* ll_map.c
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
*/
#include "libbb.h"
#include <string.h>
#include "libnetlink.h"
#include "ll_map.h"
struct idxmap
{
struct idxmap * next;
int index;
int type;
int alen;
unsigned flags;
unsigned char addr[8];
char name[16];
};
static struct idxmap *idxmap[16];
int ll_remember_index(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
int h;
struct ifinfomsg *ifi = NLMSG_DATA(n);
struct idxmap *im, **imp;
struct rtattr *tb[IFLA_MAX+1];
if (n->nlmsg_type != RTM_NEWLINK)
return 0;
if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi)))
return -1;
memset(tb, 0, sizeof(tb));
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n));
if (tb[IFLA_IFNAME] == NULL)
return 0;
h = ifi->ifi_index&0xF;
for (imp=&idxmap[h]; (im=*imp)!=NULL; imp = &im->next)
if (im->index == ifi->ifi_index)
break;
if (im == NULL) {
im = xmalloc(sizeof(*im));
im->next = *imp;
im->index = ifi->ifi_index;
*imp = im;
}
im->type = ifi->ifi_type;
im->flags = ifi->ifi_flags;
if (tb[IFLA_ADDRESS]) {
int alen;
im->alen = alen = RTA_PAYLOAD(tb[IFLA_ADDRESS]);
if (alen > sizeof(im->addr))
alen = sizeof(im->addr);
memcpy(im->addr, RTA_DATA(tb[IFLA_ADDRESS]), alen);
} else {
im->alen = 0;
memset(im->addr, 0, sizeof(im->addr));
}
strcpy(im->name, RTA_DATA(tb[IFLA_IFNAME]));
return 0;
}
const char *ll_idx_n2a(int idx, char *buf)
{
struct idxmap *im;
if (idx == 0)
return "*";
for (im = idxmap[idx&0xF]; im; im = im->next)
if (im->index == idx)
return im->name;
snprintf(buf, 16, "if%d", idx);
return buf;
}
const char *ll_index_to_name(int idx)
{
static char nbuf[16];
return ll_idx_n2a(idx, nbuf);
}
int ll_index_to_type(int idx)
{
struct idxmap *im;
if (idx == 0)
return -1;
for (im = idxmap[idx&0xF]; im; im = im->next)
if (im->index == idx)
return im->type;
return -1;
}
unsigned ll_index_to_flags(int idx)
{
struct idxmap *im;
if (idx == 0)
return 0;
for (im = idxmap[idx&0xF]; im; im = im->next)
if (im->index == idx)
return im->flags;
return 0;
}
int ll_name_to_index(char *name)
{
static char ncache[16];
static int icache;
struct idxmap *im;
int i;
if (name == NULL)
return 0;
if (icache && strcmp(name, ncache) == 0)
return icache;
for (i=0; i<16; i++) {
for (im = idxmap[i]; im; im = im->next) {
if (strcmp(im->name, name) == 0) {
icache = im->index;
strcpy(ncache, name);
return im->index;
}
}
}
return 0;
}
int ll_init_map(struct rtnl_handle *rth)
{
if (rtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK) < 0) {
perror("Cannot send dump request");
exit(1);
}
if (rtnl_dump_filter(rth, ll_remember_index, &idxmap, NULL, NULL) < 0) {
fprintf(stderr, "Dump terminated\n");
exit(1);
}
return 0;
}
|
