1 /*
2 ** Copyright 2006, The Android Open Source Project
3 **
4 ** Licensed under the Apache License, Version 2.0 (the "License");
5 ** you may not use this file except in compliance with the License.
6 ** You may obtain a copy of the License at
7 **
8 ** http://www.apache.org/licenses/LICENSE-2.0
9 **
10 ** Unless required by applicable law or agreed to in writing, software
11 ** distributed under the License is distributed on an "AS IS" BASIS,
12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 ** See the License for the specific language governing permissions and
14 ** limitations under the License.
15 */
16
17 #include <errno.h>
18 #include <dirent.h>
19 #include <netinet/ether.h>
20 #include <netinet/if_ether.h>
21 #include <netutils/dhcp.h>
22 #include <netutils/ifc.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25
die(const char * reason)26 void die(const char *reason)
27 {
28 perror(reason);
29 exit(1);
30 }
31
ipaddr(in_addr_t addr)32 const char *ipaddr(in_addr_t addr)
33 {
34 struct in_addr in_addr;
35
36 in_addr.s_addr = addr;
37 return inet_ntoa(in_addr);
38 }
39
usage(void)40 void usage(void)
41 {
42 fprintf(stderr,"usage: netcfg [<interface> {dhcp|up|down}]\n");
43 exit(1);
44 }
45
dump_interface(const char * name)46 int dump_interface(const char *name)
47 {
48 unsigned addr, flags;
49 unsigned char hwbuf[ETH_ALEN];
50 int prefixLength;
51
52 if(ifc_get_info(name, &addr, &prefixLength, &flags)) {
53 return 0;
54 }
55
56 printf("%-8s %s ", name, flags & 1 ? "UP " : "DOWN");
57 printf("%40s", ipaddr(addr));
58 printf("/%-4d", prefixLength);
59 printf("0x%08x ", flags);
60 if (!ifc_get_hwaddr(name, hwbuf)) {
61 int i;
62 for(i=0; i < (ETH_ALEN-1); i++)
63 printf("%02x:", hwbuf[i]);
64 printf("%02x\n", hwbuf[i]);
65 } else {
66 printf("\n");
67 }
68 return 0;
69 }
70
dump_interfaces(void)71 int dump_interfaces(void)
72 {
73 DIR *d;
74 struct dirent *de;
75
76 d = opendir("/sys/class/net");
77 if(d == 0) return -1;
78
79 while((de = readdir(d))) {
80 if(de->d_name[0] == '.') continue;
81 dump_interface(de->d_name);
82 }
83 closedir(d);
84 return 0;
85 }
86
set_hwaddr(const char * name,const char * asc)87 int set_hwaddr(const char *name, const char *asc) {
88 struct ether_addr *addr = ether_aton(asc);
89 if (!addr) {
90 printf("Failed to parse '%s'\n", asc);
91 return -1;
92 }
93 return ifc_set_hwaddr(name, addr->ether_addr_octet);
94 }
95
96 struct
97 {
98 const char *name;
99 int nargs;
100 void *func;
101 } CMDS[] = {
102 { "dhcp", 1, do_dhcp },
103 { "up", 1, ifc_up },
104 { "down", 1, ifc_down },
105 { "deldefault", 1, ifc_remove_default_route },
106 { "hwaddr", 2, set_hwaddr },
107 { 0, 0, 0 },
108 };
109
call_func(void * _func,unsigned nargs,char ** args)110 static int call_func(void *_func, unsigned nargs, char **args)
111 {
112 switch(nargs){
113 case 1: {
114 int (*func)(char *a0) = _func;
115 return func(args[0]);
116 }
117 case 2: {
118 int (*func)(char *a0, char *a1) = _func;
119 return func(args[0], args[1]);
120 }
121 case 3: {
122 int (*func)(char *a0, char *a1, char *a2) = _func;
123 return func(args[0], args[1], args[2]);
124 }
125 default:
126 return -1;
127 }
128 }
129
main(int argc,char ** argv)130 int main(int argc, char **argv)
131 {
132 char *iname;
133 int n;
134
135 if(ifc_init()) {
136 die("Cannot perform requested operation");
137 }
138
139 if(argc == 1) {
140 int result = dump_interfaces();
141 ifc_close();
142 return result;
143 }
144
145 if(argc < 3) usage();
146
147 iname = argv[1];
148 if(strlen(iname) > 16) usage();
149
150 argc -= 2;
151 argv += 2;
152 while(argc > 0) {
153 for(n = 0; CMDS[n].name; n++){
154 if(!strcmp(argv[0], CMDS[n].name)) {
155 char *cmdname = argv[0];
156 int nargs = CMDS[n].nargs;
157
158 argv[0] = iname;
159 if(argc < nargs) {
160 fprintf(stderr, "not enough arguments for '%s'\n", cmdname);
161 ifc_close();
162 exit(1);
163 }
164 if(call_func(CMDS[n].func, nargs, argv)) {
165 fprintf(stderr, "action '%s' failed (%s)\n", cmdname, strerror(errno));
166 ifc_close();
167 exit(1);
168 }
169 argc -= nargs;
170 argv += nargs;
171 goto done;
172 }
173 }
174 fprintf(stderr,"no such action '%s'\n", argv[0]);
175 usage();
176 done:
177 ;
178 }
179 ifc_close();
180
181 return 0;
182 }
183