summaryrefslogtreecommitdiffstats
path: root/qemu/net/dump.c
diff options
context:
space:
mode:
Diffstat (limited to 'qemu/net/dump.c')
-rw-r--r--qemu/net/dump.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/qemu/net/dump.c b/qemu/net/dump.c
new file mode 100644
index 000000000..02c8064be
--- /dev/null
+++ b/qemu/net/dump.c
@@ -0,0 +1,186 @@
+/*
+ * QEMU System Emulator
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "clients.h"
+#include "qemu-common.h"
+#include "qemu/error-report.h"
+#include "qemu/log.h"
+#include "qemu/timer.h"
+#include "hub.h"
+
+typedef struct DumpState {
+ NetClientState nc;
+ int64_t start_ts;
+ int fd;
+ int pcap_caplen;
+} DumpState;
+
+#define PCAP_MAGIC 0xa1b2c3d4
+
+struct pcap_file_hdr {
+ uint32_t magic;
+ uint16_t version_major;
+ uint16_t version_minor;
+ int32_t thiszone;
+ uint32_t sigfigs;
+ uint32_t snaplen;
+ uint32_t linktype;
+};
+
+struct pcap_sf_pkthdr {
+ struct {
+ int32_t tv_sec;
+ int32_t tv_usec;
+ } ts;
+ uint32_t caplen;
+ uint32_t len;
+};
+
+static ssize_t dump_receive(NetClientState *nc, const uint8_t *buf, size_t size)
+{
+ DumpState *s = DO_UPCAST(DumpState, nc, nc);
+ struct pcap_sf_pkthdr hdr;
+ int64_t ts;
+ int caplen;
+
+ /* Early return in case of previous error. */
+ if (s->fd < 0) {
+ return size;
+ }
+
+ ts = muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL), 1000000, get_ticks_per_sec());
+ caplen = size > s->pcap_caplen ? s->pcap_caplen : size;
+
+ hdr.ts.tv_sec = ts / 1000000 + s->start_ts;
+ hdr.ts.tv_usec = ts % 1000000;
+ hdr.caplen = caplen;
+ hdr.len = size;
+ if (write(s->fd, &hdr, sizeof(hdr)) != sizeof(hdr) ||
+ write(s->fd, buf, caplen) != caplen) {
+ qemu_log("-net dump write error - stop dump\n");
+ close(s->fd);
+ s->fd = -1;
+ }
+
+ return size;
+}
+
+static void dump_cleanup(NetClientState *nc)
+{
+ DumpState *s = DO_UPCAST(DumpState, nc, nc);
+
+ close(s->fd);
+}
+
+static NetClientInfo net_dump_info = {
+ .type = NET_CLIENT_OPTIONS_KIND_DUMP,
+ .size = sizeof(DumpState),
+ .receive = dump_receive,
+ .cleanup = dump_cleanup,
+};
+
+static int net_dump_init(NetClientState *peer, const char *device,
+ const char *name, const char *filename, int len,
+ Error **errp)
+{
+ struct pcap_file_hdr hdr;
+ NetClientState *nc;
+ DumpState *s;
+ struct tm tm;
+ int fd;
+
+ fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, 0644);
+ if (fd < 0) {
+ error_setg_errno(errp, errno, "-net dump: can't open %s", filename);
+ return -1;
+ }
+
+ hdr.magic = PCAP_MAGIC;
+ hdr.version_major = 2;
+ hdr.version_minor = 4;
+ hdr.thiszone = 0;
+ hdr.sigfigs = 0;
+ hdr.snaplen = len;
+ hdr.linktype = 1;
+
+ if (write(fd, &hdr, sizeof(hdr)) < sizeof(hdr)) {
+ error_setg_errno(errp, errno, "-net dump write error");
+ close(fd);
+ return -1;
+ }
+
+ nc = qemu_new_net_client(&net_dump_info, peer, device, name);
+
+ snprintf(nc->info_str, sizeof(nc->info_str),
+ "dump to %s (len=%d)", filename, len);
+
+ s = DO_UPCAST(DumpState, nc, nc);
+
+ s->fd = fd;
+ s->pcap_caplen = len;
+
+ qemu_get_timedate(&tm, 0);
+ s->start_ts = mktime(&tm);
+
+ return 0;
+}
+
+int net_init_dump(const NetClientOptions *opts, const char *name,
+ NetClientState *peer, Error **errp)
+{
+ int len;
+ const char *file;
+ char def_file[128];
+ const NetdevDumpOptions *dump;
+
+ assert(opts->kind == NET_CLIENT_OPTIONS_KIND_DUMP);
+ dump = opts->dump;
+
+ assert(peer);
+
+ if (dump->has_file) {
+ file = dump->file;
+ } else {
+ int id;
+ int ret;
+
+ ret = net_hub_id_for_client(peer, &id);
+ assert(ret == 0); /* peer must be on a hub */
+
+ snprintf(def_file, sizeof(def_file), "qemu-vlan%d.pcap", id);
+ file = def_file;
+ }
+
+ if (dump->has_len) {
+ if (dump->len > INT_MAX) {
+ error_setg(errp, "invalid length: %"PRIu64, dump->len);
+ return -1;
+ }
+ len = dump->len;
+ } else {
+ len = 65536;
+ }
+
+ return net_dump_init(peer, "dump", name, file, len, errp);
+}