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Commit | Line | Data |
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65018ae4 JHS |
1 | /* |
2 | * ctrl.c generic netlink controller | |
3 | * | |
4 | * This program is free software; you can distribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
80c05b09 JB |
9 | * Authors: J Hadi Salim (hadi@cyberus.ca) |
10 | * Johannes Berg (johannes@sipsolutions.net) | |
65018ae4 JHS |
11 | */ |
12 | ||
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
15 | #include <unistd.h> | |
65018ae4 JHS |
16 | #include <fcntl.h> |
17 | #include <sys/socket.h> | |
18 | #include <netinet/in.h> | |
19 | #include <arpa/inet.h> | |
20 | #include <string.h> | |
21 | ||
22 | #include "utils.h" | |
23 | #include "genl_utils.h" | |
24 | ||
26328fc3 | 25 | #define GENL_MAX_FAM_OPS 256 |
80c05b09 JB |
26 | #define GENL_MAX_FAM_GRPS 256 |
27 | ||
65018ae4 JHS |
28 | static int usage(void) |
29 | { | |
30 | fprintf(stderr,"Usage: ctrl <CMD>\n" \ | |
31 | "CMD := get <PARMS> | list | monitor\n" \ | |
32 | "PARMS := name <name> | id <id>\n" \ | |
33 | "Examples:\n" \ | |
34 | "\tctrl ls\n" \ | |
35 | "\tctrl monitor\n" \ | |
36 | "\tctrl get name foobar\n" \ | |
37 | "\tctrl get id 0xF\n"); | |
38 | return -1; | |
39 | } | |
40 | ||
d1f28cf1 | 41 | static void print_ctrl_cmd_flags(FILE *fp, __u32 fl) |
26328fc3 | 42 | { |
43 | fprintf(fp, "\n\t\tCapabilities (0x%x):\n ", fl); | |
44 | if (!fl) { | |
45 | fprintf(fp, "\n"); | |
46 | return; | |
47 | } | |
48 | fprintf(fp, "\t\t "); | |
49 | ||
50 | if (fl & GENL_ADMIN_PERM) | |
51 | fprintf(fp, " requires admin permission;"); | |
52 | if (fl & GENL_CMD_CAP_DO) | |
53 | fprintf(fp, " can doit;"); | |
54 | if (fl & GENL_CMD_CAP_DUMP) | |
55 | fprintf(fp, " can dumpit;"); | |
56 | if (fl & GENL_CMD_CAP_HASPOL) | |
57 | fprintf(fp, " has policy"); | |
58 | ||
59 | fprintf(fp, "\n"); | |
60 | } | |
e9e9365b | 61 | |
26328fc3 | 62 | static int print_ctrl_cmds(FILE *fp, struct rtattr *arg, __u32 ctrl_ver) |
63 | { | |
64 | struct rtattr *tb[CTRL_ATTR_OP_MAX + 1]; | |
65 | ||
66 | if (arg == NULL) | |
67 | return -1; | |
68 | ||
69 | parse_rtattr_nested(tb, CTRL_ATTR_OP_MAX, arg); | |
70 | if (tb[CTRL_ATTR_OP_ID]) { | |
71 | __u32 *id = RTA_DATA(tb[CTRL_ATTR_OP_ID]); | |
72 | fprintf(fp, " ID-0x%x ",*id); | |
73 | } | |
74 | /* we are only gonna do this for newer version of the controller */ | |
75 | if (tb[CTRL_ATTR_OP_FLAGS] && ctrl_ver >= 0x2) { | |
76 | __u32 *fl = RTA_DATA(tb[CTRL_ATTR_OP_FLAGS]); | |
77 | print_ctrl_cmd_flags(fp, *fl); | |
78 | } | |
79 | return 0; | |
80 | ||
81 | } | |
82 | ||
80c05b09 JB |
83 | static int print_ctrl_grp(FILE *fp, struct rtattr *arg, __u32 ctrl_ver) |
84 | { | |
85 | struct rtattr *tb[CTRL_ATTR_MCAST_GRP_MAX + 1]; | |
86 | ||
87 | if (arg == NULL) | |
88 | return -1; | |
89 | ||
90 | parse_rtattr_nested(tb, CTRL_ATTR_MCAST_GRP_MAX, arg); | |
91 | if (tb[2]) { | |
92 | __u32 *id = RTA_DATA(tb[CTRL_ATTR_MCAST_GRP_ID]); | |
93 | fprintf(fp, " ID-0x%x ",*id); | |
94 | } | |
95 | if (tb[1]) { | |
96 | char *name = RTA_DATA(tb[CTRL_ATTR_MCAST_GRP_NAME]); | |
97 | fprintf(fp, " name: %s ", name); | |
98 | } | |
99 | return 0; | |
100 | ||
101 | } | |
102 | ||
26328fc3 | 103 | /* |
104 | * The controller sends one nlmsg per family | |
105 | */ | |
cd554f2c | 106 | static int print_ctrl(struct rtnl_ctrl_data *ctrl, |
0628cddd | 107 | struct nlmsghdr *n, void *arg) |
65018ae4 JHS |
108 | { |
109 | struct rtattr *tb[CTRL_ATTR_MAX + 1]; | |
110 | struct genlmsghdr *ghdr = NLMSG_DATA(n); | |
111 | int len = n->nlmsg_len; | |
112 | struct rtattr *attrs; | |
113 | FILE *fp = (FILE *) arg; | |
81c61790 | 114 | __u32 ctrl_v = 0x1; |
65018ae4 JHS |
115 | |
116 | if (n->nlmsg_type != GENL_ID_CTRL) { | |
117 | fprintf(stderr, "Not a controller message, nlmsg_len=%d " | |
118 | "nlmsg_type=0x%x\n", n->nlmsg_len, n->nlmsg_type); | |
119 | return 0; | |
120 | } | |
121 | ||
122 | if (ghdr->cmd != CTRL_CMD_GETFAMILY && | |
123 | ghdr->cmd != CTRL_CMD_DELFAMILY && | |
80c05b09 JB |
124 | ghdr->cmd != CTRL_CMD_NEWFAMILY && |
125 | ghdr->cmd != CTRL_CMD_NEWMCAST_GRP && | |
126 | ghdr->cmd != CTRL_CMD_DELMCAST_GRP) { | |
127 | fprintf(stderr, "Unknown controller command %d\n", ghdr->cmd); | |
65018ae4 JHS |
128 | return 0; |
129 | } | |
130 | ||
131 | len -= NLMSG_LENGTH(GENL_HDRLEN); | |
132 | ||
133 | if (len < 0) { | |
134 | fprintf(stderr, "wrong controller message len %d\n", len); | |
135 | return -1; | |
136 | } | |
137 | ||
138 | attrs = (struct rtattr *) ((char *) ghdr + GENL_HDRLEN); | |
139 | parse_rtattr(tb, CTRL_ATTR_MAX, attrs, len); | |
140 | ||
141 | if (tb[CTRL_ATTR_FAMILY_NAME]) { | |
142 | char *name = RTA_DATA(tb[CTRL_ATTR_FAMILY_NAME]); | |
26328fc3 | 143 | fprintf(fp, "\nName: %s\n",name); |
65018ae4 JHS |
144 | } |
145 | if (tb[CTRL_ATTR_FAMILY_ID]) { | |
146 | __u16 *id = RTA_DATA(tb[CTRL_ATTR_FAMILY_ID]); | |
26328fc3 | 147 | fprintf(fp, "\tID: 0x%x ",*id); |
148 | } | |
149 | if (tb[CTRL_ATTR_VERSION]) { | |
150 | __u32 *v = RTA_DATA(tb[CTRL_ATTR_VERSION]); | |
151 | fprintf(fp, " Version: 0x%x ",*v); | |
152 | ctrl_v = *v; | |
65018ae4 | 153 | } |
26328fc3 | 154 | if (tb[CTRL_ATTR_HDRSIZE]) { |
155 | __u32 *h = RTA_DATA(tb[CTRL_ATTR_HDRSIZE]); | |
156 | fprintf(fp, " header size: %d ",*h); | |
157 | } | |
158 | if (tb[CTRL_ATTR_MAXATTR]) { | |
159 | __u32 *ma = RTA_DATA(tb[CTRL_ATTR_MAXATTR]); | |
160 | fprintf(fp, " max attribs: %d ",*ma); | |
161 | } | |
162 | /* end of family definitions .. */ | |
163 | fprintf(fp,"\n"); | |
164 | if (tb[CTRL_ATTR_OPS]) { | |
165 | struct rtattr *tb2[GENL_MAX_FAM_OPS]; | |
166 | int i=0; | |
167 | parse_rtattr_nested(tb2, GENL_MAX_FAM_OPS, tb[CTRL_ATTR_OPS]); | |
168 | fprintf(fp, "\tcommands supported: \n"); | |
169 | for (i = 0; i < GENL_MAX_FAM_OPS; i++) { | |
170 | if (tb2[i]) { | |
171 | fprintf(fp, "\t\t#%d: ", i); | |
172 | if (0 > print_ctrl_cmds(fp, tb2[i], ctrl_v)) { | |
173 | fprintf(fp, "Error printing command\n"); | |
174 | } | |
175 | /* for next command */ | |
176 | fprintf(fp,"\n"); | |
177 | } | |
178 | } | |
65018ae4 | 179 | |
26328fc3 | 180 | /* end of family::cmds definitions .. */ |
181 | fprintf(fp,"\n"); | |
182 | } | |
80c05b09 JB |
183 | |
184 | if (tb[CTRL_ATTR_MCAST_GROUPS]) { | |
185 | struct rtattr *tb2[GENL_MAX_FAM_GRPS + 1]; | |
186 | int i; | |
187 | ||
188 | parse_rtattr_nested(tb2, GENL_MAX_FAM_GRPS, | |
189 | tb[CTRL_ATTR_MCAST_GROUPS]); | |
190 | fprintf(fp, "\tmulticast groups:\n"); | |
191 | ||
192 | for (i = 0; i < GENL_MAX_FAM_GRPS; i++) { | |
193 | if (tb2[i]) { | |
194 | fprintf(fp, "\t\t#%d: ", i); | |
195 | if (0 > print_ctrl_grp(fp, tb2[i], ctrl_v)) | |
196 | fprintf(fp, "Error printing group\n"); | |
197 | /* for next group */ | |
198 | fprintf(fp,"\n"); | |
199 | } | |
200 | } | |
201 | ||
202 | /* end of family::groups definitions .. */ | |
203 | fprintf(fp,"\n"); | |
204 | } | |
205 | ||
65018ae4 JHS |
206 | fflush(fp); |
207 | return 0; | |
208 | } | |
209 | ||
cd554f2c | 210 | static int print_ctrl2(struct nlmsghdr *n, void *arg) |
0628cddd | 211 | { |
cd554f2c | 212 | return print_ctrl(NULL, n, arg); |
0628cddd ND |
213 | } |
214 | ||
65018ae4 JHS |
215 | static int ctrl_list(int cmd, int argc, char **argv) |
216 | { | |
217 | struct rtnl_handle rth; | |
65018ae4 JHS |
218 | int ret = -1; |
219 | char d[GENL_NAMSIZ]; | |
220 | struct { | |
221 | struct nlmsghdr n; | |
d17b136f | 222 | struct genlmsghdr g; |
65018ae4 | 223 | char buf[4096]; |
d17b136f PS |
224 | } req = { |
225 | .n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN), | |
226 | .n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK, | |
227 | .n.nlmsg_type = GENL_ID_CTRL, | |
228 | .g.cmd = CTRL_CMD_GETFAMILY, | |
229 | }; | |
230 | struct nlmsghdr *nlh = &req.n; | |
86bf43c7 | 231 | struct nlmsghdr *answer = NULL; |
65018ae4 JHS |
232 | |
233 | if (rtnl_open_byproto(&rth, 0, NETLINK_GENERIC) < 0) { | |
234 | fprintf(stderr, "Cannot open generic netlink socket\n"); | |
235 | exit(1); | |
236 | } | |
237 | ||
238 | if (cmd == CTRL_CMD_GETFAMILY) { | |
239 | if (argc != 2) { | |
240 | fprintf(stderr, "Wrong number of params\n"); | |
241 | return -1; | |
242 | } | |
243 | ||
244 | if (matches(*argv, "name") == 0) { | |
245 | NEXT_ARG(); | |
532b8874 | 246 | strlcpy(d, *argv, sizeof(d)); |
65018ae4 JHS |
247 | addattr_l(nlh, 128, CTRL_ATTR_FAMILY_NAME, |
248 | d, strlen(d) + 1); | |
249 | } else if (matches(*argv, "id") == 0) { | |
250 | __u16 id; | |
251 | NEXT_ARG(); | |
252 | if (get_u16(&id, *argv, 0)) { | |
253 | fprintf(stderr, "Illegal \"id\"\n"); | |
254 | goto ctrl_done; | |
255 | } | |
256 | ||
257 | addattr_l(nlh, 128, CTRL_ATTR_FAMILY_ID, &id, 2); | |
258 | ||
259 | } else { | |
260 | fprintf(stderr, "Wrong params\n"); | |
261 | goto ctrl_done; | |
262 | } | |
263 | ||
86bf43c7 | 264 | if (rtnl_talk(&rth, nlh, &answer) < 0) { |
65018ae4 JHS |
265 | fprintf(stderr, "Error talking to the kernel\n"); |
266 | goto ctrl_done; | |
267 | } | |
268 | ||
cd554f2c | 269 | if (print_ctrl2(answer, (void *) stdout) < 0) { |
65018ae4 JHS |
270 | fprintf(stderr, "Dump terminated\n"); |
271 | goto ctrl_done; | |
272 | } | |
273 | ||
274 | } | |
275 | ||
276 | if (cmd == CTRL_CMD_UNSPEC) { | |
277 | nlh->nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST; | |
278 | nlh->nlmsg_seq = rth.dump = ++rth.seq; | |
279 | ||
6cf8398f | 280 | if (rtnl_send(&rth, nlh, nlh->nlmsg_len) < 0) { |
65018ae4 JHS |
281 | perror("Failed to send dump request\n"); |
282 | goto ctrl_done; | |
283 | } | |
284 | ||
0628cddd | 285 | rtnl_dump_filter(&rth, print_ctrl2, stdout); |
65018ae4 JHS |
286 | |
287 | } | |
288 | ||
289 | ret = 0; | |
290 | ctrl_done: | |
86bf43c7 | 291 | free(answer); |
65018ae4 JHS |
292 | rtnl_close(&rth); |
293 | return ret; | |
294 | } | |
295 | ||
296 | static int ctrl_listen(int argc, char **argv) | |
297 | { | |
298 | struct rtnl_handle rth; | |
299 | ||
300 | if (rtnl_open_byproto(&rth, nl_mgrp(GENL_ID_CTRL), NETLINK_GENERIC) < 0) { | |
301 | fprintf(stderr, "Canot open generic netlink socket\n"); | |
302 | return -1; | |
303 | } | |
304 | ||
305 | if (rtnl_listen(&rth, print_ctrl, (void *) stdout) < 0) | |
306 | return -1; | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
311 | static int parse_ctrl(struct genl_util *a, int argc, char **argv) | |
312 | { | |
313 | argv++; | |
314 | if (--argc <= 0) { | |
315 | fprintf(stderr, "wrong controller params\n"); | |
316 | return -1; | |
317 | } | |
318 | ||
319 | if (matches(*argv, "monitor") == 0) | |
320 | return ctrl_listen(argc-1, argv+1); | |
321 | if (matches(*argv, "get") == 0) | |
322 | return ctrl_list(CTRL_CMD_GETFAMILY, argc-1, argv+1); | |
323 | if (matches(*argv, "list") == 0 || | |
324 | matches(*argv, "show") == 0 || | |
325 | matches(*argv, "lst") == 0) | |
326 | return ctrl_list(CTRL_CMD_UNSPEC, argc-1, argv+1); | |
327 | if (matches(*argv, "help") == 0) | |
328 | return usage(); | |
329 | ||
3669d218 | 330 | fprintf(stderr, "ctrl command \"%s\" is unknown, try \"ctrl help\".\n", |
65018ae4 JHS |
331 | *argv); |
332 | ||
333 | return -1; | |
334 | } | |
335 | ||
336 | struct genl_util ctrl_genl_util = { | |
337 | .name = "ctrl", | |
338 | .parse_genlopt = parse_ctrl, | |
0628cddd | 339 | .print_genlopt = print_ctrl2, |
65018ae4 | 340 | }; |