xref: /openbmc/qemu/net/dump.c (revision 34163432) 
1 /*
2  * QEMU System Emulator
3  *
4  * Copyright (c) 2003-2008 Fabrice Bellard
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22  * THE SOFTWARE.
23  */
24 
25 #include "qemu/osdep.h"
26 #include "clients.h"
27 #include "qapi/error.h"
28 #include "qemu-common.h"
29 #include "qemu/error-report.h"
30 #include "qemu/iov.h"
31 #include "qemu/log.h"
32 #include "qemu/timer.h"
33 #include "qapi/visitor.h"
34 #include "net/filter.h"
35 
36 typedef struct DumpState {
37     int64_t start_ts;
38     int fd;
39     int pcap_caplen;
40 } DumpState;
41 
42 #define PCAP_MAGIC 0xa1b2c3d4
43 
44 struct pcap_file_hdr {
45     uint32_t magic;
46     uint16_t version_major;
47     uint16_t version_minor;
48     int32_t thiszone;
49     uint32_t sigfigs;
50     uint32_t snaplen;
51     uint32_t linktype;
52 };
53 
54 struct pcap_sf_pkthdr {
55     struct {
56         int32_t tv_sec;
57         int32_t tv_usec;
58     } ts;
59     uint32_t caplen;
60     uint32_t len;
61 };
62 
63 static ssize_t dump_receive_iov(DumpState *s, const struct iovec *iov, int cnt)
64 {
65     struct pcap_sf_pkthdr hdr;
66     int64_t ts;
67     int caplen;
68     size_t size = iov_size(iov, cnt);
69     struct iovec dumpiov[cnt + 1];
70 
71     /* Early return in case of previous error. */
72     if (s->fd < 0) {
73         return size;
74     }
75 
76     ts = qemu_clock_get_us(QEMU_CLOCK_VIRTUAL);
77     caplen = size > s->pcap_caplen ? s->pcap_caplen : size;
78 
79     hdr.ts.tv_sec = ts / 1000000 + s->start_ts;
80     hdr.ts.tv_usec = ts % 1000000;
81     hdr.caplen = caplen;
82     hdr.len = size;
83 
84     dumpiov[0].iov_base = &hdr;
85     dumpiov[0].iov_len = sizeof(hdr);
86     cnt = iov_copy(&dumpiov[1], cnt, iov, cnt, 0, caplen);
87 
88     if (writev(s->fd, dumpiov, cnt + 1) != sizeof(hdr) + caplen) {
89         error_report("network dump write error - stopping dump");
90         close(s->fd);
91         s->fd = -1;
92     }
93 
94     return size;
95 }
96 
97 static void dump_cleanup(DumpState *s)
98 {
99     close(s->fd);
100     s->fd = -1;
101 }
102 
103 static int net_dump_state_init(DumpState *s, const char *filename,
104                                int len, Error **errp)
105 {
106     struct pcap_file_hdr hdr;
107     struct tm tm;
108     int fd;
109 
110     fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, 0644);
111     if (fd < 0) {
112         error_setg_errno(errp, errno, "-net dump: can't open %s", filename);
113         return -1;
114     }
115 
116     hdr.magic = PCAP_MAGIC;
117     hdr.version_major = 2;
118     hdr.version_minor = 4;
119     hdr.thiszone = 0;
120     hdr.sigfigs = 0;
121     hdr.snaplen = len;
122     hdr.linktype = 1;
123 
124     if (write(fd, &hdr, sizeof(hdr)) < sizeof(hdr)) {
125         error_setg_errno(errp, errno, "-net dump write error");
126         close(fd);
127         return -1;
128     }
129 
130     s->fd = fd;
131     s->pcap_caplen = len;
132 
133     qemu_get_timedate(&tm, 0);
134     s->start_ts = mktime(&tm);
135 
136     return 0;
137 }
138 
139 /* Dumping via VLAN netclient */
140 
141 struct DumpNetClient {
142     NetClientState nc;
143     DumpState ds;
144 };
145 typedef struct DumpNetClient DumpNetClient;
146 
147 static ssize_t dumpclient_receive(NetClientState *nc, const uint8_t *buf,
148                                   size_t size)
149 {
150     DumpNetClient *dc = DO_UPCAST(DumpNetClient, nc, nc);
151     struct iovec iov = {
152         .iov_base = (void *)buf,
153         .iov_len = size
154     };
155 
156     return dump_receive_iov(&dc->ds, &iov, 1);
157 }
158 
159 static ssize_t dumpclient_receive_iov(NetClientState *nc,
160                                       const struct iovec *iov, int cnt)
161 {
162     DumpNetClient *dc = DO_UPCAST(DumpNetClient, nc, nc);
163 
164     return dump_receive_iov(&dc->ds, iov, cnt);
165 }
166 
167 static void dumpclient_cleanup(NetClientState *nc)
168 {
169     DumpNetClient *dc = DO_UPCAST(DumpNetClient, nc, nc);
170 
171     dump_cleanup(&dc->ds);
172 }
173 
174 static NetClientInfo net_dump_info = {
175     .type = NET_CLIENT_DRIVER_DUMP,
176     .size = sizeof(DumpNetClient),
177     .receive = dumpclient_receive,
178     .receive_iov = dumpclient_receive_iov,
179     .cleanup = dumpclient_cleanup,
180 };
181 
182 int net_init_dump(const Netdev *netdev, const char *name,
183                   NetClientState *peer, Error **errp)
184 {
185     int len, rc;
186     const char *file;
187     char def_file[128];
188     const NetdevDumpOptions *dump;
189     NetClientState *nc;
190     DumpNetClient *dnc;
191 
192     assert(netdev->type == NET_CLIENT_DRIVER_DUMP);
193     dump = &netdev->u.dump;
194 
195     assert(peer);
196 
197     error_report("'-net dump' is deprecated. "
198                  "Please use '-object filter-dump' instead.");
199 
200     if (dump->has_file) {
201         file = dump->file;
202     } else {
203         int id;
204         int ret;
205 
206         ret = net_hub_id_for_client(peer, &id);
207         assert(ret == 0); /* peer must be on a hub */
208 
209         snprintf(def_file, sizeof(def_file), "qemu-vlan%d.pcap", id);
210         file = def_file;
211     }
212 
213     if (dump->has_len) {
214         if (dump->len > INT_MAX) {
215             error_setg(errp, "invalid length: %"PRIu64, dump->len);
216             return -1;
217         }
218         len = dump->len;
219     } else {
220         len = 65536;
221     }
222 
223     nc = qemu_new_net_client(&net_dump_info, peer, "dump", name);
224     snprintf(nc->info_str, sizeof(nc->info_str),
225              "dump to %s (len=%d)", file, len);
226 
227     dnc = DO_UPCAST(DumpNetClient, nc, nc);
228     rc = net_dump_state_init(&dnc->ds, file, len, errp);
229     if (rc) {
230         qemu_del_net_client(nc);
231     }
232     return rc;
233 }
234 
235 /* Dumping via filter */
236 
237 #define TYPE_FILTER_DUMP "filter-dump"
238 
239 #define FILTER_DUMP(obj) \
240     OBJECT_CHECK(NetFilterDumpState, (obj), TYPE_FILTER_DUMP)
241 
242 struct NetFilterDumpState {
243     NetFilterState nfs;
244     DumpState ds;
245     char *filename;
246     uint32_t maxlen;
247 };
248 typedef struct NetFilterDumpState NetFilterDumpState;
249 
250 static ssize_t filter_dump_receive_iov(NetFilterState *nf, NetClientState *sndr,
251                                        unsigned flags, const struct iovec *iov,
252                                        int iovcnt, NetPacketSent *sent_cb)
253 {
254     NetFilterDumpState *nfds = FILTER_DUMP(nf);
255 
256     dump_receive_iov(&nfds->ds, iov, iovcnt);
257     return 0;
258 }
259 
260 static void filter_dump_cleanup(NetFilterState *nf)
261 {
262     NetFilterDumpState *nfds = FILTER_DUMP(nf);
263 
264     dump_cleanup(&nfds->ds);
265 }
266 
267 static void filter_dump_setup(NetFilterState *nf, Error **errp)
268 {
269     NetFilterDumpState *nfds = FILTER_DUMP(nf);
270 
271     if (!nfds->filename) {
272         error_setg(errp, "dump filter needs 'file' property set!");
273         return;
274     }
275 
276     net_dump_state_init(&nfds->ds, nfds->filename, nfds->maxlen, errp);
277 }
278 
279 static void filter_dump_get_maxlen(Object *obj, Visitor *v, const char *name,
280                                    void *opaque, Error **errp)
281 {
282     NetFilterDumpState *nfds = FILTER_DUMP(obj);
283     uint32_t value = nfds->maxlen;
284 
285     visit_type_uint32(v, name, &value, errp);
286 }
287 
288 static void filter_dump_set_maxlen(Object *obj, Visitor *v, const char *name,
289                                    void *opaque, Error **errp)
290 {
291     NetFilterDumpState *nfds = FILTER_DUMP(obj);
292     Error *local_err = NULL;
293     uint32_t value;
294 
295     visit_type_uint32(v, name, &value, &local_err);
296     if (local_err) {
297         goto out;
298     }
299     if (value == 0) {
300         error_setg(&local_err, "Property '%s.%s' doesn't take value '%u'",
301                    object_get_typename(obj), name, value);
302         goto out;
303     }
304     nfds->maxlen = value;
305 
306 out:
307     error_propagate(errp, local_err);
308 }
309 
310 static char *file_dump_get_filename(Object *obj, Error **errp)
311 {
312     NetFilterDumpState *nfds = FILTER_DUMP(obj);
313 
314     return g_strdup(nfds->filename);
315 }
316 
317 static void file_dump_set_filename(Object *obj, const char *value, Error **errp)
318 {
319    NetFilterDumpState *nfds = FILTER_DUMP(obj);
320 
321     g_free(nfds->filename);
322     nfds->filename = g_strdup(value);
323 }
324 
325 static void filter_dump_instance_init(Object *obj)
326 {
327     NetFilterDumpState *nfds = FILTER_DUMP(obj);
328 
329     nfds->maxlen = 65536;
330 
331     object_property_add(obj, "maxlen", "uint32", filter_dump_get_maxlen,
332                         filter_dump_set_maxlen, NULL, NULL, NULL);
333     object_property_add_str(obj, "file", file_dump_get_filename,
334                             file_dump_set_filename, NULL);
335 }
336 
337 static void filter_dump_instance_finalize(Object *obj)
338 {
339     NetFilterDumpState *nfds = FILTER_DUMP(obj);
340 
341     g_free(nfds->filename);
342 }
343 
344 static void filter_dump_class_init(ObjectClass *oc, void *data)
345 {
346     NetFilterClass *nfc = NETFILTER_CLASS(oc);
347 
348     nfc->setup = filter_dump_setup;
349     nfc->cleanup = filter_dump_cleanup;
350     nfc->receive_iov = filter_dump_receive_iov;
351 }
352 
353 static const TypeInfo filter_dump_info = {
354     .name = TYPE_FILTER_DUMP,
355     .parent = TYPE_NETFILTER,
356     .class_init = filter_dump_class_init,
357     .instance_init = filter_dump_instance_init,
358     .instance_finalize = filter_dump_instance_finalize,
359     .instance_size = sizeof(NetFilterDumpState),
360 };
361 
362 static void filter_dump_register_types(void)
363 {
364     type_register_static(&filter_dump_info);
365 }
366 
367 type_init(filter_dump_register_types);
368