Merge branch 'master' of git://git.qemu.org/qemu
[qemu/mdroth.git] / net / dump.c
blob0d0cbb2591ef31bc36ddecb00ba2cbc57bd6da96
1 /*
2 * QEMU System Emulator
4 * Copyright (c) 2003-2008 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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.
25 #include "dump.h"
26 #include "qemu-common.h"
27 #include "qemu-error.h"
28 #include "qemu-log.h"
29 #include "qemu-timer.h"
31 typedef struct DumpState {
32 VLANClientState nc;
33 int fd;
34 int pcap_caplen;
35 } DumpState;
37 #define PCAP_MAGIC 0xa1b2c3d4
39 struct 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;
49 struct 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;
58 static ssize_t dump_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
60 DumpState *s = DO_UPCAST(DumpState, nc, nc);
61 struct pcap_sf_pkthdr hdr;
62 int64_t ts;
63 int caplen;
65 /* Early return in case of previous error. */
66 if (s->fd < 0) {
67 return size;
70 ts = muldiv64(qemu_get_clock_ns(vm_clock), 1000000, get_ticks_per_sec());
71 caplen = size > s->pcap_caplen ? s->pcap_caplen : size;
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;
84 return size;
87 static void dump_cleanup(VLANClientState *nc)
89 DumpState *s = DO_UPCAST(DumpState, nc, nc);
91 close(s->fd);
94 static NetClientInfo net_dump_info = {
95 .type = NET_CLIENT_TYPE_DUMP,
96 .size = sizeof(DumpState),
97 .receive = dump_receive,
98 .cleanup = dump_cleanup,
101 static int net_dump_init(VLANState *vlan, const char *device,
102 const char *name, const char *filename, int len)
104 struct pcap_file_hdr hdr;
105 VLANClientState *nc;
106 DumpState *s;
107 int fd;
109 fd = open(filename, O_CREAT | O_WRONLY | O_BINARY, 0644);
110 if (fd < 0) {
111 error_report("-net dump: can't open %s", filename);
112 return -1;
115 hdr.magic = PCAP_MAGIC;
116 hdr.version_major = 2;
117 hdr.version_minor = 4;
118 hdr.thiszone = 0;
119 hdr.sigfigs = 0;
120 hdr.snaplen = len;
121 hdr.linktype = 1;
123 if (write(fd, &hdr, sizeof(hdr)) < sizeof(hdr)) {
124 error_report("-net dump write error: %s", strerror(errno));
125 close(fd);
126 return -1;
129 nc = qemu_new_net_client(&net_dump_info, vlan, NULL, device, name);
131 snprintf(nc->info_str, sizeof(nc->info_str),
132 "dump to %s (len=%d)", filename, len);
134 s = DO_UPCAST(DumpState, nc, nc);
136 s->fd = fd;
137 s->pcap_caplen = len;
139 return 0;
142 int net_init_dump(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan)
144 int len;
145 const char *file;
146 char def_file[128];
148 assert(vlan);
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;
156 len = qemu_opt_get_size(opts, "len", 65536);
158 return net_dump_init(vlan, "dump", name, file, len);