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