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* Copyright (c) 2003-2008 Fabrice Bellard
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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#include "qemu-common.h"
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#include "qemu-error.h"
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#include "qemu-timer.h"
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typedef struct DumpState {
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#define PCAP_MAGIC 0xa1b2c3d4
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struct pcap_file_hdr {
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uint16_t version_major;
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uint16_t version_minor;
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struct pcap_sf_pkthdr {
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static ssize_t dump_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
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DumpState *s = DO_UPCAST(DumpState, nc, nc);
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struct pcap_sf_pkthdr hdr;
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/* Early return in case of previous error. */
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ts = muldiv64(qemu_get_clock_ns(vm_clock), 1000000, get_ticks_per_sec());
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caplen = size > s->pcap_caplen ? s->pcap_caplen : size;
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hdr.ts.tv_sec = ts / 1000000;
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hdr.ts.tv_usec = ts % 1000000;
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if (write(s->fd, &hdr, sizeof(hdr)) != sizeof(hdr) ||
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write(s->fd, buf, caplen) != caplen) {
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qemu_log("-net dump write error - stop dump\n");
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static void dump_cleanup(VLANClientState *nc)
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DumpState *s = DO_UPCAST(DumpState, nc, nc);
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static NetClientInfo net_dump_info = {
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.type = NET_CLIENT_TYPE_DUMP,
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.size = sizeof(DumpState),
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.receive = dump_receive,
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.cleanup = dump_cleanup,
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static int net_dump_init(VLANState *vlan, const char *device,
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const char *name, const char *filename, int len)
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struct pcap_file_hdr hdr;
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fd = open(filename, O_CREAT | O_WRONLY | O_BINARY, 0644);
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error_report("-net dump: can't open %s", filename);
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hdr.magic = PCAP_MAGIC;
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hdr.version_major = 2;
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hdr.version_minor = 4;
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if (write(fd, &hdr, sizeof(hdr)) < sizeof(hdr)) {
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error_report("-net dump write error: %s", strerror(errno));
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nc = qemu_new_net_client(&net_dump_info, vlan, NULL, device, name);
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snprintf(nc->info_str, sizeof(nc->info_str),
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"dump to %s (len=%d)", filename, len);
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s = DO_UPCAST(DumpState, nc, nc);
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s->pcap_caplen = len;
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int net_init_dump(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan)
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file = qemu_opt_get(opts, "file");
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snprintf(def_file, sizeof(def_file), "qemu-vlan%d.pcap", vlan->id);
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len = qemu_opt_get_size(opts, "len", 65536);
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return net_dump_init(vlan, "dump", name, file, len);