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/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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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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*
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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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*
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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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* THE SOFTWARE.
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*/
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#include "clients.h" |
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#include "qemu-common.h" |
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#include "qemu/error-report.h" |
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#include "qemu/log.h" |
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#include "qemu/timer.h" |
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#include "hub.h" |
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typedef struct DumpState { |
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NetClientState nc; |
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int64_t start_ts; |
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int fd;
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int pcap_caplen;
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} DumpState; |
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#define PCAP_MAGIC 0xa1b2c3d4 |
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struct pcap_file_hdr {
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uint32_t magic; |
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uint16_t version_major; |
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uint16_t version_minor; |
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int32_t thiszone; |
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uint32_t sigfigs; |
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uint32_t snaplen; |
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uint32_t linktype; |
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}; |
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struct pcap_sf_pkthdr {
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struct {
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int32_t tv_sec; |
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int32_t tv_usec; |
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} ts; |
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uint32_t caplen; |
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uint32_t len; |
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}; |
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static ssize_t dump_receive(NetClientState *nc, const uint8_t *buf, size_t size) |
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{ |
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DumpState *s = DO_UPCAST(DumpState, nc, nc); |
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struct pcap_sf_pkthdr hdr;
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int64_t ts; |
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int caplen;
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/* Early return in case of previous error. */
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if (s->fd < 0) { |
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return size;
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} |
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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 + s->start_ts;
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hdr.ts.tv_usec = ts % 1000000;
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hdr.caplen = caplen; |
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hdr.len = size; |
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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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close(s->fd); |
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s->fd = -1;
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} |
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return size;
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} |
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static void dump_cleanup(NetClientState *nc) |
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{ |
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DumpState *s = DO_UPCAST(DumpState, nc, nc); |
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close(s->fd); |
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} |
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static NetClientInfo net_dump_info = {
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.type = NET_CLIENT_OPTIONS_KIND_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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}; |
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static int net_dump_init(NetClientState *peer, const char *device, |
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const char *name, const char *filename, int len) |
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{ |
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struct pcap_file_hdr hdr;
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NetClientState *nc; |
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DumpState *s; |
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struct tm tm;
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int fd;
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fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, 0644);
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if (fd < 0) { |
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error_report("-net dump: can't open %s", filename);
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return -1; |
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} |
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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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hdr.thiszone = 0;
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hdr.sigfigs = 0;
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hdr.snaplen = len; |
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hdr.linktype = 1;
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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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close(fd); |
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return -1; |
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} |
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nc = qemu_new_net_client(&net_dump_info, peer, 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->fd = fd; |
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s->pcap_caplen = len; |
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qemu_get_timedate(&tm, 0);
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s->start_ts = mktime(&tm); |
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return 0; |
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} |
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int net_init_dump(const NetClientOptions *opts, const char *name, |
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NetClientState *peer) |
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{ |
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int len;
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const char *file; |
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char def_file[128]; |
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const NetdevDumpOptions *dump;
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assert(opts->kind == NET_CLIENT_OPTIONS_KIND_DUMP); |
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dump = opts->dump; |
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assert(peer); |
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if (dump->has_file) {
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file = dump->file; |
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} else {
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int id;
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int ret;
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ret = net_hub_id_for_client(peer, &id); |
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assert(ret == 0); /* peer must be on a hub */ |
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snprintf(def_file, sizeof(def_file), "qemu-vlan%d.pcap", id); |
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file = def_file; |
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} |
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if (dump->has_len) {
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if (dump->len > INT_MAX) {
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error_report("invalid length: %"PRIu64, dump->len);
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return -1; |
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} |
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len = dump->len; |
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} else {
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len = 65536;
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} |
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return net_dump_init(peer, "dump", name, file, len); |
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} |