1 /*
2 * Check decoding of netlink protocol.
3 *
4 * Copyright (c) 2014-2017 Dmitry V. Levin <ldv@strace.io>
5 * Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
6 * Copyright (c) 2016-2021 The strace developers.
7 * All rights reserved.
8 *
9 * SPDX-License-Identifier: GPL-2.0-or-later
10 */
11
12 #include "tests.h"
13
14 #ifdef HAVE_SYS_XATTR_H
15
16 # include <stdio.h>
17 # include <stdlib.h>
18 # include <string.h>
19 # include <unistd.h>
20 # include <sys/xattr.h>
21 # include <netinet/in.h>
22 # include "netlink.h"
23 # include <linux/sock_diag.h>
24 # include <linux/netlink_diag.h>
25 # include "xmalloc.h"
26
27 static void
28 send_query(const int fd)
29 {
30 static const struct req {
31 struct nlmsghdr nlh;
32 const char magic[4];
33 } c_req = {
34 .nlh = {
35 .nlmsg_len = sizeof(struct req),
36 .nlmsg_type = NLMSG_NOOP,
37 .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
38 },
39 .magic = "abcd"
40 };
41 struct req *const req = tail_memdup(&c_req, sizeof(c_req));
42 long rc;
43 const char *errstr;
44
45 /* zero address */
46 rc = sendto(fd, NULL, sizeof(*req), MSG_DONTWAIT, NULL, 0);
47 printf("sendto(%d, NULL, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
48 fd, (unsigned) sizeof(*req), sprintrc(rc));
49
50 /* zero length */
51 rc = sendto(fd, req, 0, MSG_DONTWAIT, NULL, 0);
52 printf("sendto(%d, \"\", 0, MSG_DONTWAIT, NULL, 0) = %s\n",
53 fd, sprintrc(rc));
54
55 /* zero address and length */
56 rc = sendto(fd, NULL, 0, MSG_DONTWAIT, NULL, 0);
57 printf("sendto(%d, NULL, 0, MSG_DONTWAIT, NULL, 0) = %s\n",
58 fd, sprintrc(rc));
59
60 /* unfetchable struct nlmsghdr */
61 const void *const efault = tail_alloc(sizeof(struct nlmsghdr) - 1);
62 rc = sendto(fd, efault, sizeof(struct nlmsghdr), MSG_DONTWAIT, NULL, 0);
63 printf("sendto(%d, %p, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
64 fd, efault, (unsigned) sizeof(struct nlmsghdr), sprintrc(rc));
65
66 /* whole message length < sizeof(struct nlmsghdr) */
67 rc = sendto(fd, req->magic, sizeof(req->magic), MSG_DONTWAIT, NULL, 0);
68 printf("sendto(%d, \"\\x61\\x62\\x63\\x64\""
69 ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
70 fd, (unsigned) sizeof(req->magic), sprintrc(rc));
71
72 /* a single message with some data */
73 rc = sendto(fd, req, sizeof(*req), MSG_DONTWAIT, NULL, 0);
74 printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=NLMSG_NOOP"
75 ", nlmsg_flags=NLM_F_REQUEST|0x%x"
76 ", nlmsg_seq=0, nlmsg_pid=0}, \"\\x61\\x62\\x63\\x64\"]"
77 ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
78 fd, req->nlh.nlmsg_len, NLM_F_DUMP,
79 (unsigned) sizeof(*req), sprintrc(rc));
80
81 /* a single message without data */
82 req->nlh.nlmsg_len = sizeof(req->nlh);
83 rc = sendto(fd, &req->nlh, sizeof(req->nlh), MSG_DONTWAIT, NULL, 0);
84 printf("sendto(%d, {nlmsg_len=%u, nlmsg_type=NLMSG_NOOP"
85 ", nlmsg_flags=NLM_F_REQUEST|0x%x"
86 ", nlmsg_seq=0, nlmsg_pid=0}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
87 fd, req->nlh.nlmsg_len, NLM_F_DUMP,
88 (unsigned) sizeof(req->nlh), sprintrc(rc));
89
90 /* nlmsg_len > whole message length */
91 req->nlh.nlmsg_len = sizeof(*req) + 8;
92 rc = sendto(fd, req, sizeof(*req), MSG_DONTWAIT, NULL, 0);
93 printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=NLMSG_NOOP"
94 ", nlmsg_flags=NLM_F_REQUEST|0x%x"
95 ", nlmsg_seq=0, nlmsg_pid=0}, \"\\x61\\x62\\x63\\x64\"]"
96 ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
97 fd, req->nlh.nlmsg_len, NLM_F_DUMP,
98 (unsigned) sizeof(*req), sprintrc(rc));
99
100 /* nlmsg_len < sizeof(struct nlmsghdr) */
101 req->nlh.nlmsg_len = 8;
102 rc = sendto(fd, req, sizeof(*req), MSG_DONTWAIT, NULL, 0);
103 printf("sendto(%d, {nlmsg_len=%u, nlmsg_type=NLMSG_NOOP"
104 ", nlmsg_flags=NLM_F_REQUEST|0x%x"
105 ", nlmsg_seq=0, nlmsg_pid=0}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
106 fd, req->nlh.nlmsg_len, NLM_F_DUMP,
107 (unsigned) sizeof(*req), sprintrc(rc));
108
109 /* a sequence of two nlmsg objects */
110 struct reqs {
111 struct req req1;
112 char padding[NLMSG_ALIGN(sizeof(struct req)) - sizeof(struct req)];
113 struct req req2;
114 };
115 TAIL_ALLOC_OBJECT_CONST_PTR(struct reqs, reqs);
116 memcpy(&reqs->req1, &c_req, sizeof(c_req));
117 memcpy(&reqs->req2, &c_req, sizeof(c_req));
118
119 rc = sendto(fd, reqs, sizeof(*reqs), MSG_DONTWAIT, NULL, 0);
120 printf("sendto(%d, [[{nlmsg_len=%u, nlmsg_type=NLMSG_NOOP"
121 ", nlmsg_flags=NLM_F_REQUEST|0x%x"
122 ", nlmsg_seq=0, nlmsg_pid=0}, \"\\x61\\x62\\x63\\x64\"]"
123 ", [{nlmsg_len=%u, nlmsg_type=NLMSG_NOOP"
124 ", nlmsg_flags=NLM_F_REQUEST|0x%x"
125 ", nlmsg_seq=0, nlmsg_pid=0}, \"\\x61\\x62\\x63\\x64\"]]"
126 ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
127 fd, reqs->req1.nlh.nlmsg_len, NLM_F_DUMP,
128 reqs->req2.nlh.nlmsg_len, NLM_F_DUMP,
129 (unsigned) sizeof(*reqs), sprintrc(rc));
130
131 /* unfetchable second struct nlmsghdr */
132 void *const efault2 = tail_memdup(&reqs->req1, sizeof(reqs->req1));
133 rc = sendto(fd, efault2, sizeof(*reqs), MSG_DONTWAIT, NULL, 0);
134 printf("sendto(%d, [[{nlmsg_len=%u, nlmsg_type=NLMSG_NOOP"
135 ", nlmsg_flags=NLM_F_REQUEST|0x%x"
136 ", nlmsg_seq=0, nlmsg_pid=0}, \"\\x61\\x62\\x63\\x64\"]"
137 ", ... /* %p */], %u, MSG_DONTWAIT, NULL, 0) = %s\n",
138 fd, reqs->req1.nlh.nlmsg_len, NLM_F_DUMP,
139 &((struct reqs *) efault2)->req2, (unsigned) sizeof(*reqs),
140 sprintrc(rc));
141
142 /* message length is not enough for the second struct nlmsghdr */
143 rc = sendto(fd, reqs, sizeof(*reqs) - sizeof(req->nlh), MSG_DONTWAIT,
144 NULL, 0);
145 errstr = sprintrc(rc);
146 printf("sendto(%d, [[{nlmsg_len=%u, nlmsg_type=NLMSG_NOOP"
147 ", nlmsg_flags=NLM_F_REQUEST|0x%x"
148 ", nlmsg_seq=0, nlmsg_pid=0}, \"\\x61\\x62\\x63\\x64\"], ",
149 fd, reqs->req1.nlh.nlmsg_len, NLM_F_DUMP);
150 print_quoted_hex(&reqs->req2.nlh,
151 sizeof(reqs->req2) - sizeof(req->nlh));
152 printf("], %u, MSG_DONTWAIT, NULL, 0) = %s\n",
153 (unsigned) (sizeof(*reqs) - sizeof(req->nlh)), errstr);
154
155 /* second nlmsg_len < sizeof(struct nlmsghdr) */
156 reqs->req2.nlh.nlmsg_len = 4;
157 rc = sendto(fd, reqs, sizeof(*reqs), MSG_DONTWAIT, NULL, 0);
158 printf("sendto(%d, [[{nlmsg_len=%u, nlmsg_type=NLMSG_NOOP"
159 ", nlmsg_flags=NLM_F_REQUEST|0x%x"
160 ", nlmsg_seq=0, nlmsg_pid=0}, \"\\x61\\x62\\x63\\x64\"]"
161 ", {nlmsg_len=%u, nlmsg_type=NLMSG_NOOP"
162 ", nlmsg_flags=NLM_F_REQUEST|0x%x"
163 ", nlmsg_seq=0, nlmsg_pid=0}], %u, MSG_DONTWAIT, NULL, 0) = %s\n",
164 fd, reqs->req1.nlh.nlmsg_len, NLM_F_DUMP,
165 reqs->req2.nlh.nlmsg_len, NLM_F_DUMP,
166 (unsigned) sizeof(*reqs), sprintrc(rc));
167
168 /* abbreviated output */
169 # define ABBREV_LEN (DEFAULT_STRLEN + 1)
170 const unsigned int msg_len = sizeof(struct nlmsghdr) * ABBREV_LEN;
171 struct nlmsghdr *const msgs = tail_alloc(msg_len);
172 for (unsigned int i = 0; i < ABBREV_LEN; ++i) {
173 msgs[i].nlmsg_len = sizeof(*msgs);
174 msgs[i].nlmsg_type = NLMSG_NOOP;
175 msgs[i].nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST;
176 msgs[i].nlmsg_seq = i;
177 msgs[i].nlmsg_pid = 0;
178 }
179
180 rc = sendto(fd, msgs, msg_len, MSG_DONTWAIT, NULL, 0);
181 errstr = sprintrc(rc);
182 printf("sendto(%d, [", fd);
183 for (unsigned int i = 0; i < DEFAULT_STRLEN; ++i) {
184 if (i)
185 printf(", ");
186 printf("{nlmsg_len=%u, nlmsg_type=NLMSG_NOOP"
187 ", nlmsg_flags=NLM_F_REQUEST|0x%x"
188 ", nlmsg_seq=%u, nlmsg_pid=0}",
189 msgs[i].nlmsg_len, NLM_F_DUMP, msgs[i].nlmsg_seq);
190 }
191 printf(", ...], %u, MSG_DONTWAIT, NULL, 0) = %s\n", msg_len, errstr);
192 }
193
194 static void
195 test_nlmsgerr(const int fd)
196 {
197 struct nlmsgerr *err;
198 struct nlmsghdr *nlh;
199 void *const nlh0 = midtail_alloc(NLMSG_HDRLEN, sizeof(*err) + 4);
200 long rc;
201 const char *rcstr;
202
203 /* error message with nlmsg_len exceeding the allocated room */
204 nlh = nlh0;
205 nlh->nlmsg_len = NLMSG_HDRLEN + 4;
206 nlh->nlmsg_type = NLMSG_ERROR;
207 nlh->nlmsg_flags = NLM_F_REQUEST;
208 nlh->nlmsg_seq = 0;
209 nlh->nlmsg_pid = 0;
210
211 rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
212 printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=NLMSG_ERROR"
213 ", nlmsg_flags=NLM_F_REQUEST, nlmsg_seq=0, nlmsg_pid=0}"
214 ", %p], %u, MSG_DONTWAIT, NULL, 0) = %s\n",
215 fd, nlh->nlmsg_len, nlh0 + NLMSG_HDRLEN,
216 nlh->nlmsg_len, sprintrc(rc));
217
218 /* error message without enough room for the error code */
219 nlh->nlmsg_len = NLMSG_HDRLEN + 2;
220 nlh = nlh0 - 2;
221 memmove(nlh, nlh0, sizeof(*nlh));
222 memcpy(NLMSG_DATA(nlh), "42", 2);
223
224 rc = sendto(fd, nlh, NLMSG_HDRLEN + 2, MSG_DONTWAIT, NULL, 0);
225 printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=NLMSG_ERROR"
226 ", nlmsg_flags=NLM_F_REQUEST, nlmsg_seq=0, nlmsg_pid=0}"
227 ", \"\\x34\\x32\"], %u, MSG_DONTWAIT, NULL, 0) = %s\n",
228 fd, NLMSG_HDRLEN + 2, NLMSG_HDRLEN + 2, sprintrc(rc));
229
230 /* error message with room for the error code only */
231 nlh = nlh0 - sizeof(err->error);
232 nlh->nlmsg_len = NLMSG_HDRLEN + sizeof(err->error);
233 nlh->nlmsg_type = NLMSG_ERROR;
234 nlh->nlmsg_flags = NLM_F_REQUEST;
235 nlh->nlmsg_seq = 0;
236 nlh->nlmsg_pid = 0;
237 err = NLMSG_DATA(nlh);
238 fill_memory(&err->error, sizeof(err->error));
239
240 rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
241 rcstr = sprintrc(rc);
242 printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=NLMSG_ERROR"
243 ", nlmsg_flags=NLM_F_REQUEST, nlmsg_seq=0, nlmsg_pid=0}, ",
244 fd, nlh->nlmsg_len);
245 print_quoted_hex(&err->error, sizeof(err->error));
246 printf("], %u, MSG_DONTWAIT, NULL, 0) = %s\n", nlh->nlmsg_len, rcstr);
247
248 /* error message without enough room for the whole struct nlmsgerr */
249 nlh = nlh0 - (sizeof(*err) - 4);
250 nlh->nlmsg_len = NLMSG_HDRLEN + (sizeof(*err) - 4);
251 nlh->nlmsg_type = NLMSG_ERROR;
252 nlh->nlmsg_flags = NLM_F_REQUEST;
253 nlh->nlmsg_seq = 0;
254 nlh->nlmsg_pid = 0;
255 err = NLMSG_DATA(nlh);
256 fill_memory(err, sizeof(*err) - 4);
257
258 rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
259 rcstr = sprintrc(rc);
260 printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=NLMSG_ERROR"
261 ", nlmsg_flags=NLM_F_REQUEST, nlmsg_seq=0, nlmsg_pid=0}, ",
262 fd, nlh->nlmsg_len);
263 print_quoted_hex(err, sizeof(*err) - 4);
264 printf("], %u, MSG_DONTWAIT, NULL, 0) = %s\n", nlh->nlmsg_len, rcstr);
265
266 /* error message with nlmsg_len exceeding the allocated room */
267 nlh->nlmsg_len = NLMSG_HDRLEN + sizeof(*err);
268
269 rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
270 printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=NLMSG_ERROR"
271 ", nlmsg_flags=NLM_F_REQUEST, nlmsg_seq=0, nlmsg_pid=0}"
272 ", %p], %u, MSG_DONTWAIT, NULL, 0) = %s\n",
273 fd, nlh->nlmsg_len, err, nlh->nlmsg_len, sprintrc(rc));
274
275 /* error message with room for the error code and a header */
276 nlh = nlh0 - sizeof(*err);
277 nlh->nlmsg_len = NLMSG_HDRLEN + sizeof(*err);
278 nlh->nlmsg_type = NLMSG_ERROR;
279 nlh->nlmsg_flags = NLM_F_REQUEST;
280 nlh->nlmsg_seq = 0;
281 nlh->nlmsg_pid = 0;
282 err = NLMSG_DATA(nlh);
283 err->error = -13;
284 err->msg.nlmsg_len = NLMSG_HDRLEN;
285 err->msg.nlmsg_type = NLMSG_NOOP;
286 err->msg.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST;
287 err->msg.nlmsg_seq = 42;
288 err->msg.nlmsg_pid = 1234;
289
290 rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
291 printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=NLMSG_ERROR"
292 ", nlmsg_flags=NLM_F_REQUEST, nlmsg_seq=0, nlmsg_pid=0}"
293 ", {error=-EACCES, msg={nlmsg_len=%u, nlmsg_type=NLMSG_NOOP"
294 ", nlmsg_flags=NLM_F_REQUEST|0x%x, nlmsg_seq=%u, nlmsg_pid=%d}}]"
295 ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
296 fd, nlh->nlmsg_len, err->msg.nlmsg_len, NLM_F_DUMP,
297 err->msg.nlmsg_seq, err->msg.nlmsg_pid,
298 nlh->nlmsg_len, sprintrc(rc));
299
300 /* err->msg.nlmsg_len < sizeof(err->msg) */
301 err->msg.nlmsg_len = sizeof(err->msg.nlmsg_len);
302
303 rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
304 printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=NLMSG_ERROR"
305 ", nlmsg_flags=NLM_F_REQUEST, nlmsg_seq=0, nlmsg_pid=0}"
306 ", {error=-EACCES, msg={nlmsg_len=%u, nlmsg_type=NLMSG_NOOP"
307 ", nlmsg_flags=NLM_F_REQUEST|0x%x, nlmsg_seq=%u, nlmsg_pid=%d}}]"
308 ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
309 fd, nlh->nlmsg_len, err->msg.nlmsg_len, NLM_F_DUMP,
310 err->msg.nlmsg_seq, err->msg.nlmsg_pid,
311 nlh->nlmsg_len, sprintrc(rc));
312
313 /* nlh->nlmsg_len < NLMSG_HDRLEN + err->msg.nlmsg_len */
314 err->msg.nlmsg_len = NLMSG_HDRLEN + 4;
315
316 rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
317 printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=NLMSG_ERROR"
318 ", nlmsg_flags=NLM_F_REQUEST, nlmsg_seq=0, nlmsg_pid=0}"
319 ", {error=-EACCES, msg={nlmsg_len=%u, nlmsg_type=NLMSG_NOOP"
320 ", nlmsg_flags=NLM_F_REQUEST|0x%x, nlmsg_seq=%u, nlmsg_pid=%d}}]"
321 ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
322 fd, nlh->nlmsg_len, err->msg.nlmsg_len, NLM_F_DUMP,
323 err->msg.nlmsg_seq, err->msg.nlmsg_pid,
324 nlh->nlmsg_len, sprintrc(rc));
325
326 /* error message with room for the error code, a header, and some data */
327 nlh = nlh0 - sizeof(*err) - 4;
328 nlh->nlmsg_len = NLMSG_HDRLEN + sizeof(*err) + 4;
329 nlh->nlmsg_type = NLMSG_ERROR;
330 nlh->nlmsg_flags = NLM_F_REQUEST;
331 nlh->nlmsg_seq = 0;
332 nlh->nlmsg_pid = 0;
333 err = NLMSG_DATA(nlh);
334 err->error = -13;
335 err->msg.nlmsg_len = NLMSG_HDRLEN + 4;
336 err->msg.nlmsg_type = NLMSG_NOOP;
337 err->msg.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST;
338 err->msg.nlmsg_seq = 421;
339 err->msg.nlmsg_pid = 12345;
340 memcpy(NLMSG_DATA(&err->msg), "abcd", 4);
341
342 rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
343 printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=NLMSG_ERROR"
344 ", nlmsg_flags=NLM_F_REQUEST, nlmsg_seq=0, nlmsg_pid=0}"
345 ", {error=-EACCES, msg=[{nlmsg_len=%u, nlmsg_type=NLMSG_NOOP"
346 ", nlmsg_flags=NLM_F_REQUEST|0x%x, nlmsg_seq=%u, nlmsg_pid=%d}"
347 ", \"\\x61\\x62\\x63\\x64\"]}], %u, MSG_DONTWAIT, NULL, 0)"
348 " = %s\n",
349 fd, nlh->nlmsg_len, err->msg.nlmsg_len, NLM_F_DUMP,
350 err->msg.nlmsg_seq, err->msg.nlmsg_pid,
351 nlh->nlmsg_len, sprintrc(rc));
352
353 nlh->nlmsg_len = NLMSG_HDRLEN + sizeof(*err) + 1;
354 err->msg.nlmsg_len = NLMSG_HDRLEN + 1;
355 err->msg.nlmsg_type = SOCK_DIAG_BY_FAMILY;
356 err->msg.nlmsg_flags = NLM_F_REQUEST;
357 err->msg.nlmsg_seq = 4213;
358 err->msg.nlmsg_pid = 123456;
359 memcpy(NLMSG_DATA(&err->msg), "", 1);
360
361 rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
362 printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=NLMSG_ERROR"
363 ", nlmsg_flags=NLM_F_REQUEST, nlmsg_seq=0, nlmsg_pid=0}"
364 ", {error=-EACCES, msg=[{nlmsg_len=%u"
365 ", nlmsg_type=SOCK_DIAG_BY_FAMILY, nlmsg_flags=NLM_F_REQUEST"
366 ", nlmsg_seq=%u, nlmsg_pid=%d}, {family=AF_UNSPEC}]}]"
367 ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
368 fd, nlh->nlmsg_len, err->msg.nlmsg_len,
369 err->msg.nlmsg_seq, err->msg.nlmsg_pid,
370 nlh->nlmsg_len, sprintrc(rc));
371 }
372
373 static void
374 test_nlmsg_done(const int fd)
375 {
376 struct nlmsghdr *nlh;
377 const int num = 0xfacefeed;
378 void *const nlh0 = midtail_alloc(NLMSG_HDRLEN, sizeof(num));
379 long rc;
380
381 /* NLMSG_DONE message without enough room for an integer payload */
382 nlh = nlh0;
383 *nlh = (struct nlmsghdr) {
384 .nlmsg_len = NLMSG_HDRLEN + sizeof(num),
385 .nlmsg_type = NLMSG_DONE,
386 .nlmsg_flags = NLM_F_MULTI
387 };
388
389 rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
390 printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=NLMSG_DONE"
391 ", nlmsg_flags=NLM_F_MULTI, nlmsg_seq=0, nlmsg_pid=0}, %p]"
392 ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
393 fd, nlh->nlmsg_len, nlh0 + NLMSG_HDRLEN,
394 nlh->nlmsg_len, sprintrc(rc));
395
396 /* NLMSG_DONE message with enough room for an oddly short payload */
397 nlh->nlmsg_len = NLMSG_HDRLEN + 2;
398 nlh = nlh0 - 2;
399 /* Beware of unaligned access to nlh members. */
400 memmove(nlh, nlh0, sizeof(*nlh));
401 memcpy(NLMSG_DATA(nlh), "42", 2);
402
403 rc = sendto(fd, nlh, NLMSG_HDRLEN + 2, MSG_DONTWAIT, NULL, 0);
404 printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=NLMSG_DONE"
405 ", nlmsg_flags=NLM_F_MULTI, nlmsg_seq=0, nlmsg_pid=0}"
406 ", \"\\x34\\x32\"], %u, MSG_DONTWAIT, NULL, 0) = %s\n",
407 fd, NLMSG_HDRLEN + 2, NLMSG_HDRLEN + 2, sprintrc(rc));
408
409 /* NLMSG_DONE message with enough room for an integer payload */
410 nlh = nlh0 - sizeof(num);
411 *nlh = (struct nlmsghdr) {
412 .nlmsg_len = NLMSG_HDRLEN + sizeof(num),
413 .nlmsg_type = NLMSG_DONE,
414 .nlmsg_flags = NLM_F_MULTI
415 };
416 memcpy(NLMSG_DATA(nlh), &num, sizeof(num));
417
418 rc = sendto(fd, nlh, nlh->nlmsg_len, MSG_DONTWAIT, NULL, 0);
419 printf("sendto(%d, [{nlmsg_len=%u, nlmsg_type=NLMSG_DONE"
420 ", nlmsg_flags=NLM_F_MULTI, nlmsg_seq=0, nlmsg_pid=0}, %d]"
421 ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
422 fd, nlh->nlmsg_len, num, nlh->nlmsg_len, sprintrc(rc));
423 }
424
425 static void
426 test_ack_flags(const int fd)
427 {
428 long rc;
429 struct nlmsghdr nlh = {
430 .nlmsg_len = sizeof(nlh),
431 .nlmsg_type = NLMSG_ERROR,
432 };
433
434 nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CAPPED,
435 rc = sendto(fd, &nlh, sizeof(nlh), MSG_DONTWAIT, NULL, 0);
436 printf("sendto(%d, {nlmsg_len=%u, nlmsg_type=NLMSG_ERROR"
437 ", nlmsg_flags=NLM_F_REQUEST|NLM_F_CAPPED, nlmsg_seq=0"
438 ", nlmsg_pid=0}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
439 fd, nlh.nlmsg_len, (unsigned) sizeof(nlh), sprintrc(rc));
440
441 nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK_TLVS;
442 rc = sendto(fd, &nlh, sizeof(nlh), MSG_DONTWAIT, NULL, 0);
443 printf("sendto(%d, {nlmsg_len=%u, nlmsg_type=NLMSG_ERROR"
444 ", nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK_TLVS, nlmsg_seq=0"
445 ", nlmsg_pid=0}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
446 fd, nlh.nlmsg_len, (unsigned) sizeof(nlh), sprintrc(rc));
447
448 nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CAPPED | NLM_F_ACK_TLVS;
449 rc = sendto(fd, &nlh, sizeof(nlh), MSG_DONTWAIT, NULL, 0);
450 printf("sendto(%d, {nlmsg_len=%u, nlmsg_type=NLMSG_ERROR"
451 ", nlmsg_flags=NLM_F_REQUEST|NLM_F_CAPPED|NLM_F_ACK_TLVS"
452 ", nlmsg_seq=0, nlmsg_pid=0}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
453 fd, nlh.nlmsg_len, (unsigned) sizeof(nlh), sprintrc(rc));
454 }
455
456 int main(void)
457 {
458 const int fd = create_nl_socket(NETLINK_SOCK_DIAG);
459
460 char *path = xasprintf("/proc/self/fd/%u", fd);
461 char buf[256];
462 if (getxattr(path, "system.sockprotoname", buf, sizeof(buf) - 1) < 0)
463 perror_msg_and_skip("getxattr");
464 free(path);
465
466 send_query(fd);
467 test_nlmsgerr(fd);
468 test_nlmsg_done(fd);
469 test_ack_flags(fd);
470
471 puts("+++ exited with 0 +++");
472 return 0;
473 }
474
475 #else
476
477 SKIP_MAIN_UNDEFINED("HAVE_SYS_XATTR_H")
478
479 #endif