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Mark McLoughlin1abecf72009-11-25 18:48:57 +00001/*
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 "dump.h"
26#include "qemu-common.h"
27#include "sysemu.h"
Markus Armbruster2f792012010-02-18 16:24:31 +010028#include "qemu-error.h"
Mark McLoughlin1abecf72009-11-25 18:48:57 +000029#include "qemu-log.h"
30
31typedef struct DumpState {
Mark McLoughlin731d5852009-11-25 18:49:09 +000032 VLANClientState nc;
Mark McLoughlin1abecf72009-11-25 18:48:57 +000033 int fd;
34 int pcap_caplen;
35} DumpState;
36
37#define PCAP_MAGIC 0xa1b2c3d4
38
39struct pcap_file_hdr {
40 uint32_t magic;
41 uint16_t version_major;
42 uint16_t version_minor;
43 int32_t thiszone;
44 uint32_t sigfigs;
45 uint32_t snaplen;
46 uint32_t linktype;
47};
48
49struct pcap_sf_pkthdr {
50 struct {
51 int32_t tv_sec;
52 int32_t tv_usec;
53 } ts;
54 uint32_t caplen;
55 uint32_t len;
56};
57
Mark McLoughlin731d5852009-11-25 18:49:09 +000058static ssize_t dump_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
Mark McLoughlin1abecf72009-11-25 18:48:57 +000059{
Mark McLoughlin731d5852009-11-25 18:49:09 +000060 DumpState *s = DO_UPCAST(DumpState, nc, nc);
Mark McLoughlin1abecf72009-11-25 18:48:57 +000061 struct pcap_sf_pkthdr hdr;
62 int64_t ts;
63 int caplen;
64
65 /* Early return in case of previous error. */
66 if (s->fd < 0) {
67 return size;
68 }
69
70 ts = muldiv64(qemu_get_clock(vm_clock), 1000000, get_ticks_per_sec());
71 caplen = size > s->pcap_caplen ? s->pcap_caplen : size;
72
73 hdr.ts.tv_sec = ts / 1000000;
74 hdr.ts.tv_usec = ts % 1000000;
75 hdr.caplen = caplen;
76 hdr.len = size;
77 if (write(s->fd, &hdr, sizeof(hdr)) != sizeof(hdr) ||
78 write(s->fd, buf, caplen) != caplen) {
79 qemu_log("-net dump write error - stop dump\n");
80 close(s->fd);
81 s->fd = -1;
82 }
83
84 return size;
85}
86
Mark McLoughlin731d5852009-11-25 18:49:09 +000087static void dump_cleanup(VLANClientState *nc)
Mark McLoughlin1abecf72009-11-25 18:48:57 +000088{
Mark McLoughlin731d5852009-11-25 18:49:09 +000089 DumpState *s = DO_UPCAST(DumpState, nc, nc);
Mark McLoughlin1abecf72009-11-25 18:48:57 +000090
91 close(s->fd);
Mark McLoughlin1abecf72009-11-25 18:48:57 +000092}
93
Mark McLoughlin731d5852009-11-25 18:49:09 +000094static NetClientInfo net_dump_info = {
95 .type = NET_CLIENT_TYPE_DUMP,
96 .size = sizeof(DumpState),
97 .receive = dump_receive,
98 .cleanup = dump_cleanup,
99};
100
Mark McLoughlin1abecf72009-11-25 18:48:57 +0000101static int net_dump_init(VLANState *vlan, const char *device,
102 const char *name, const char *filename, int len)
103{
104 struct pcap_file_hdr hdr;
Mark McLoughlin731d5852009-11-25 18:49:09 +0000105 VLANClientState *nc;
Mark McLoughlin1abecf72009-11-25 18:48:57 +0000106 DumpState *s;
Mark McLoughlin731d5852009-11-25 18:49:09 +0000107 int fd;
Mark McLoughlin1abecf72009-11-25 18:48:57 +0000108
Mark McLoughlin731d5852009-11-25 18:49:09 +0000109 fd = open(filename, O_CREAT | O_WRONLY | O_BINARY, 0644);
110 if (fd < 0) {
Markus Armbruster1ecda022010-02-18 17:25:24 +0100111 error_report("-net dump: can't open %s", filename);
Mark McLoughlin1abecf72009-11-25 18:48:57 +0000112 return -1;
113 }
114
Mark McLoughlin1abecf72009-11-25 18:48:57 +0000115 hdr.magic = PCAP_MAGIC;
116 hdr.version_major = 2;
117 hdr.version_minor = 4;
118 hdr.thiszone = 0;
119 hdr.sigfigs = 0;
Mark McLoughlin731d5852009-11-25 18:49:09 +0000120 hdr.snaplen = len;
Mark McLoughlin1abecf72009-11-25 18:48:57 +0000121 hdr.linktype = 1;
122
Mark McLoughlin731d5852009-11-25 18:49:09 +0000123 if (write(fd, &hdr, sizeof(hdr)) < sizeof(hdr)) {
Markus Armbruster1ecda022010-02-18 17:25:24 +0100124 error_report("-net dump write error: %s", strerror(errno));
Mark McLoughlin731d5852009-11-25 18:49:09 +0000125 close(fd);
Mark McLoughlin1abecf72009-11-25 18:48:57 +0000126 return -1;
127 }
128
Mark McLoughlin731d5852009-11-25 18:49:09 +0000129 nc = qemu_new_net_client(&net_dump_info, vlan, NULL, device, name);
130
131 snprintf(nc->info_str, sizeof(nc->info_str),
Mark McLoughlin1abecf72009-11-25 18:48:57 +0000132 "dump to %s (len=%d)", filename, len);
Mark McLoughlin731d5852009-11-25 18:49:09 +0000133
134 s = DO_UPCAST(DumpState, nc, nc);
135
136 s->fd = fd;
137 s->pcap_caplen = len;
138
Mark McLoughlin1abecf72009-11-25 18:48:57 +0000139 return 0;
140}
141
142int net_init_dump(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan)
143{
144 int len;
145 const char *file;
146 char def_file[128];
147
148 assert(vlan);
149
150 file = qemu_opt_get(opts, "file");
151 if (!file) {
152 snprintf(def_file, sizeof(def_file), "qemu-vlan%d.pcap", vlan->id);
153 file = def_file;
154 }
155
156 len = qemu_opt_get_size(opts, "len", 65536);
157
158 return net_dump_init(vlan, "dump", name, file, len);
159}