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1 | /* Copyright (C) 1997 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If | |
16 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
17 | Cambridge, MA 02139, USA. */ | |
18 | ||
19 | #include <string.h> | |
20 | #include <stdio.h> | |
21 | #include <stdlib.h> | |
22 | #include <net/if.h> | |
23 | ||
24 | #define IF_INET6_FILENAME "/proc/net/if_inet6" | |
25 | ||
26 | /* /proc/net/if_inet6 contains lines that look like this: | |
27 | * | |
28 | * fe8000000000000000000000836fc168 0b 00 20 80 sit7 | |
29 | * | |
30 | * | | | | | | | |
31 | * address --' | | | | | | |
32 | * index --------' | | | | | |
33 | * prefix length ---' | | | | |
34 | * scope --------------' | | | |
35 | * flags -----------------' | | |
36 | * name -------------------------' | |
37 | * | |
38 | */ | |
39 | ||
40 | static int get_one_interface(FILE *fd, char *interface, int iflen, unsigned int *index) | |
41 | { | |
42 | char buffer[80]; | |
43 | static char seps[] = " \012"; | |
44 | char *c = buffer; | |
45 | char *sp; | |
46 | if (!fgets(buffer, 80, fd)) | |
47 | return 1; | |
48 | if (strtok_r(buffer, seps, &sp) == NULL) return 1; | |
49 | if (c = strtok_r(NULL, seps, &sp), c == NULL) return 1; | |
50 | *index = strtoul(c, NULL, 16); | |
51 | if (strtok_r(NULL, seps, &sp) == NULL) return 1; | |
52 | if (strtok_r(NULL, seps, &sp) == NULL) return 1; | |
53 | if (strtok_r(NULL, seps, &sp) == NULL) return 1; | |
54 | if (c = strtok_r(NULL, seps, &sp), c == NULL) return 1; | |
55 | strncpy(interface, c, iflen); | |
56 | return 0; | |
57 | } | |
58 | ||
59 | unsigned int if_nametoindex(const char *ifname) | |
60 | { | |
61 | FILE *fd = fopen(IF_INET6_FILENAME, "r"); | |
62 | char this_ifname[IFNAMSIZ]; | |
63 | unsigned int this_index; | |
64 | if (!fd) return 0; | |
65 | while (get_one_interface(fd, this_ifname, IFNAMSIZ, &this_index) == 0) { | |
66 | if (!strcmp(this_ifname, ifname)) { | |
67 | fclose(fd); | |
68 | return this_index; | |
69 | } | |
70 | } | |
71 | fclose(fd); | |
72 | return 0; | |
73 | } | |
74 | ||
75 | char *if_indextoname(unsigned int ifindex, char *ifname) | |
76 | { | |
77 | FILE *fd = fopen(IF_INET6_FILENAME, "r"); | |
78 | unsigned int this_index; | |
79 | if (!fd) return NULL; | |
80 | while (get_one_interface(fd, ifname, IFNAMSIZ, &this_index) == 0) { | |
81 | if (this_index == ifindex) { | |
82 | fclose(fd); | |
83 | return ifname; | |
84 | } | |
85 | } | |
86 | fclose(fd); | |
87 | return NULL; | |
88 | } | |
89 | ||
90 | void if_freenameindex(struct if_nameindex *ifn) | |
91 | { | |
92 | struct if_nameindex *ptr = ifn; | |
93 | while (ptr->if_name || ptr->if_index) | |
94 | { | |
95 | if (ptr->if_name) | |
96 | free(ptr->if_name); | |
97 | ptr++; | |
98 | } | |
99 | free(ifn); | |
100 | } | |
101 | ||
102 | struct if_nameindex *if_nameindex(void) | |
103 | { | |
104 | FILE *fd = fopen(IF_INET6_FILENAME, "r"); | |
105 | struct if_nameindex *ifn = NULL; | |
106 | int nifs = 0; | |
107 | if (!fd) return NULL; | |
108 | do | |
109 | { | |
110 | struct if_nameindex *newifn; | |
111 | nifs++; | |
112 | newifn = realloc(ifn, nifs*sizeof(struct if_nameindex)); | |
113 | if (!newifn) | |
114 | { | |
115 | /* We ran out of memory. */ | |
116 | if (--nifs) | |
117 | { | |
118 | free(ifn[nifs-1].if_name); | |
119 | ifn[nifs-1].if_name = 0; | |
120 | ifn[nifs-1].if_index = 0; | |
121 | if_freenameindex(ifn); | |
122 | } | |
123 | return NULL; | |
124 | } | |
125 | ifn = newifn; | |
126 | ifn[nifs-1].if_index = 0; | |
127 | ifn[nifs-1].if_name = malloc(IFNAMSIZ); | |
128 | if (ifn[nifs-1].if_name == NULL) | |
129 | { | |
130 | if_freenameindex(ifn); | |
131 | return NULL; | |
132 | } | |
133 | } | |
134 | while (get_one_interface(fd, ifn[nifs-1].if_name, IFNAMSIZ, | |
135 | &ifn[nifs-1].if_index) == 0); | |
136 | free(ifn[nifs-1].if_name); | |
137 | ifn[nifs-1].if_name = NULL; | |
138 | fclose(fd); | |
139 | return ifn; | |
140 | } |