net/dump.c

   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 "qemu-common.h"
  28 #include "qemu/error-report.h"
  29 #include "qemu/iov.h"
  30 #include "qemu/log.h"
  31 #include "qemu/timer.h"
  32 #include "qapi/visitor.h"
  33 #include "net/filter.h"
  34
  35 typedef struct DumpState {
  36     int64_t start_ts;
  37     int fd;
  38     int pcap_caplen;
  39 } DumpState;
  40
  41 #define PCAP_MAGIC 0xa1b2c3d4
  42
  43 struct pcap_file_hdr {
  44     uint32_t magic;
  45     uint16_t version_major;
  46     uint16_t version_minor;
  47     int32_t thiszone;
  48     uint32_t sigfigs;
  49     uint32_t snaplen;
  50     uint32_t linktype;
  51 };
  52
  53 struct pcap_sf_pkthdr {
  54     struct {
  55         int32_t tv_sec;
  56         int32_t tv_usec;
  57     } ts;
  58     uint32_t caplen;
  59     uint32_t len;
  60 };
  61
  62 static ssize_t dump_receive_iov(DumpState *s, const struct iovec *iov, int cnt)
  63 {
  64     struct pcap_sf_pkthdr hdr;
  65     int64_t ts;
  66     int caplen;
  67     size_t size = iov_size(iov, cnt);
  68     struct iovec dumpiov[cnt + 1];
  69
  70     /* Early return in case of previous error. */
  71     if (s->fd < 0) {
  72         return size;
  73     }
  74
  75     ts = qemu_clock_get_us(QEMU_CLOCK_VIRTUAL);
  76     caplen = size > s->pcap_caplen ? s->pcap_caplen : size;
  77
  78     hdr.ts.tv_sec = ts / 1000000 + s->start_ts;
  79     hdr.ts.tv_usec = ts % 1000000;
  80     hdr.caplen = caplen;
  81     hdr.len = size;
  82
  83     dumpiov[0].iov_base = &hdr;
  84     dumpiov[0].iov_len = sizeof(hdr);
  85     cnt = iov_copy(&dumpiov[1], cnt, iov, cnt, 0, caplen);
  86
  87     if (writev(s->fd, dumpiov, cnt + 1) != sizeof(hdr) + caplen) {
  88         error_report("network dump write error - stopping dump");
  89         close(s->fd);
  90         s->fd = -1;
  91     }
  92
  93     return size;
  94 }
  95
  96 static void dump_cleanup(DumpState *s)
  97 {
  98     close(s->fd);
  99     s->fd = -1;
 100 }
 101
 102 static int net_dump_state_init(DumpState *s, const char *filename,
 103                                int len, Error **errp)
 104 {
 105     struct pcap_file_hdr hdr;
 106     struct tm tm;
 107     int fd;
 108
 109     fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, 0644);
 110     if (fd < 0) {
 111         error_setg_errno(errp, errno, "-net dump: can't open %s", filename);
 112         return -1;
 113     }
 114
 115     hdr.magic = PCAP_MAGIC;
 116     hdr.version_major = 2;
 117     hdr.version_minor = 4;
 118     hdr.thiszone = 0;
 119     hdr.sigfigs = 0;
 120     hdr.snaplen = len;
 121     hdr.linktype = 1;
 122
 123     if (write(fd, &hdr, sizeof(hdr)) < sizeof(hdr)) {
 124         error_setg_errno(errp, errno, "-net dump write error");
 125         close(fd);
 126         return -1;
 127     }
 128
 129     s->fd = fd;
 130     s->pcap_caplen = len;
 131
 132     qemu_get_timedate(&tm, 0);
 133     s->start_ts = mktime(&tm);
 134
 135     return 0;
 136 }
 137
 138 /* Dumping via VLAN netclient */
 139
 140 struct DumpNetClient {
 141     NetClientState nc;
 142     DumpState ds;
 143 };
 144 typedef struct DumpNetClient DumpNetClient;
 145
 146 static ssize_t dumpclient_receive(NetClientState *nc, const uint8_t *buf,
 147                                   size_t size)
 148 {
 149     DumpNetClient *dc = DO_UPCAST(DumpNetClient, nc, nc);
 150     struct iovec iov = {
 151         .iov_base = (void *)buf,
 152         .iov_len = size
 153     };
 154
 155     return dump_receive_iov(&dc->ds, &iov, 1);
 156 }
 157
 158 static ssize_t dumpclient_receive_iov(NetClientState *nc,
 159                                       const struct iovec *iov, int cnt)
 160 {
 161     DumpNetClient *dc = DO_UPCAST(DumpNetClient, nc, nc);
 162
 163     return dump_receive_iov(&dc->ds, iov, cnt);
 164 }
 165
 166 static void dumpclient_cleanup(NetClientState *nc)
 167 {
 168     DumpNetClient *dc = DO_UPCAST(DumpNetClient, nc, nc);
 169
 170     dump_cleanup(&dc->ds);
 171 }
 172
 173 static NetClientInfo net_dump_info = {
 174     .type = NET_CLIENT_OPTIONS_KIND_DUMP,
 175     .size = sizeof(DumpNetClient),
 176     .receive = dumpclient_receive,
 177     .receive_iov = dumpclient_receive_iov,
 178     .cleanup = dumpclient_cleanup,
 179 };
 180
 181 int net_init_dump(const NetClientOptions *opts, const char *name,
 182                   NetClientState *peer, Error **errp)
 183 {
 184     int len, rc;
 185     const char *file;
 186     char def_file[128];
 187     const NetdevDumpOptions *dump;
 188     NetClientState *nc;
 189     DumpNetClient *dnc;
 190
 191     assert(opts->type == NET_CLIENT_OPTIONS_KIND_DUMP);
 192     dump = opts->u.dump.data;
 193
 194     assert(peer);
 195
 196     if (dump->has_file) {
 197         file = dump->file;
 198     } else {
 199         int id;
 200         int ret;
 201
 202         ret = net_hub_id_for_client(peer, &id);
 203         assert(ret == 0); /* peer must be on a hub */
 204
 205         snprintf(def_file, sizeof(def_file), "qemu-vlan%d.pcap", id);
 206         file = def_file;
 207     }
 208
 209     if (dump->has_len) {
 210         if (dump->len > INT_MAX) {
 211             error_setg(errp, "invalid length: %"PRIu64, dump->len);
 212             return -1;
 213         }
 214         len = dump->len;
 215     } else {
 216         len = 65536;
 217     }
 218
 219     nc = qemu_new_net_client(&net_dump_info, peer, "dump", name);
 220     snprintf(nc->info_str, sizeof(nc->info_str),
 221              "dump to %s (len=%d)", file, len);
 222
 223     dnc = DO_UPCAST(DumpNetClient, nc, nc);
 224     rc = net_dump_state_init(&dnc->ds, file, len, errp);
 225     if (rc) {
 226         qemu_del_net_client(nc);
 227     }
 228     return rc;
 229 }
 230
 231 /* Dumping via filter */
 232
 233 #define TYPE_FILTER_DUMP "filter-dump"
 234
 235 #define FILTER_DUMP(obj) \
 236     OBJECT_CHECK(NetFilterDumpState, (obj), TYPE_FILTER_DUMP)
 237
 238 struct NetFilterDumpState {
 239     NetFilterState nfs;
 240     DumpState ds;
 241     char *filename;
 242     uint32_t maxlen;
 243 };
 244 typedef struct NetFilterDumpState NetFilterDumpState;
 245
 246 static ssize_t filter_dump_receive_iov(NetFilterState *nf, NetClientState *sndr,
 247                                        unsigned flags, const struct iovec *iov,
 248                                        int iovcnt, NetPacketSent *sent_cb)
 249 {
 250     NetFilterDumpState *nfds = FILTER_DUMP(nf);
 251
 252     dump_receive_iov(&nfds->ds, iov, iovcnt);
 253     return 0;
 254 }
 255
 256 static void filter_dump_cleanup(NetFilterState *nf)
 257 {
 258     NetFilterDumpState *nfds = FILTER_DUMP(nf);
 259
 260     dump_cleanup(&nfds->ds);
 261 }
 262
 263 static void filter_dump_setup(NetFilterState *nf, Error **errp)
 264 {
 265     NetFilterDumpState *nfds = FILTER_DUMP(nf);
 266
 267     if (!nfds->filename) {
 268         error_setg(errp, "dump filter needs 'file' property set!");
 269         return;
 270     }
 271
 272     net_dump_state_init(&nfds->ds, nfds->filename, nfds->maxlen, errp);
 273 }
 274
 275 static void filter_dump_get_maxlen(Object *obj, Visitor *v, const char *name,
 276                                    void *opaque, Error **errp)
 277 {
 278     NetFilterDumpState *nfds = FILTER_DUMP(obj);
 279     uint32_t value = nfds->maxlen;
 280
 281     visit_type_uint32(v, name, &value, errp);
 282 }
 283
 284 static void filter_dump_set_maxlen(Object *obj, Visitor *v, const char *name,
 285                                    void *opaque, Error **errp)
 286 {
 287     NetFilterDumpState *nfds = FILTER_DUMP(obj);
 288     Error *local_err = NULL;
 289     uint32_t value;
 290
 291     visit_type_uint32(v, name, &value, &local_err);
 292     if (local_err) {
 293         goto out;
 294     }
 295     if (value == 0) {
 296         error_setg(&local_err, "Property '%s.%s' doesn't take value '%u'",
 297                    object_get_typename(obj), name, value);
 298         goto out;
 299     }
 300     nfds->maxlen = value;
 301
 302 out:
 303     error_propagate(errp, local_err);
 304 }
 305
 306 static char *file_dump_get_filename(Object *obj, Error **errp)
 307 {
 308     NetFilterDumpState *nfds = FILTER_DUMP(obj);
 309
 310     return g_strdup(nfds->filename);
 311 }
 312
 313 static void file_dump_set_filename(Object *obj, const char *value, Error **errp)
 314 {
 315    NetFilterDumpState *nfds = FILTER_DUMP(obj);
 316
 317     g_free(nfds->filename);
 318     nfds->filename = g_strdup(value);
 319 }
 320
 321 static void filter_dump_instance_init(Object *obj)
 322 {
 323     NetFilterDumpState *nfds = FILTER_DUMP(obj);
 324
 325     nfds->maxlen = 65536;
 326
 327     object_property_add(obj, "maxlen", "int", filter_dump_get_maxlen,
 328                         filter_dump_set_maxlen, NULL, NULL, NULL);
 329     object_property_add_str(obj, "file", file_dump_get_filename,
 330                             file_dump_set_filename, NULL);
 331 }
 332
 333 static void filter_dump_instance_finalize(Object *obj)
 334 {
 335     NetFilterDumpState *nfds = FILTER_DUMP(obj);
 336
 337     g_free(nfds->filename);
 338 }
 339
 340 static void filter_dump_class_init(ObjectClass *oc, void *data)
 341 {
 342     NetFilterClass *nfc = NETFILTER_CLASS(oc);
 343
 344     nfc->setup = filter_dump_setup;
 345     nfc->cleanup = filter_dump_cleanup;
 346     nfc->receive_iov = filter_dump_receive_iov;
 347 }
 348
 349 static const TypeInfo filter_dump_info = {
 350     .name = TYPE_FILTER_DUMP,
 351     .parent = TYPE_NETFILTER,
 352     .class_init = filter_dump_class_init,
 353     .instance_init = filter_dump_instance_init,
 354     .instance_finalize = filter_dump_instance_finalize,
 355     .instance_size = sizeof(NetFilterDumpState),
 356 };
 357
 358 static void filter_dump_register_types(void)
 359 {
 360     type_register_static(&filter_dump_info);
 361 }
 362
 363 type_init(filter_dump_register_types);