qdev: remove baked in notion of aliases (v2)
[qemu.git] / net / dump.c
1 /*
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 "qemu-error.h"
28 #include "qemu-log.h"
29 #include "qemu-timer.h"
30
31 typedef struct DumpState {
32 VLANClientState nc;
33 int64_t start_ts;
34 int fd;
35 int pcap_caplen;
36 } DumpState;
37
38 #define PCAP_MAGIC 0xa1b2c3d4
39
40 struct pcap_file_hdr {
41 uint32_t magic;
42 uint16_t version_major;
43 uint16_t version_minor;
44 int32_t thiszone;
45 uint32_t sigfigs;
46 uint32_t snaplen;
47 uint32_t linktype;
48 };
49
50 struct pcap_sf_pkthdr {
51 struct {
52 int32_t tv_sec;
53 int32_t tv_usec;
54 } ts;
55 uint32_t caplen;
56 uint32_t len;
57 };
58
59 static ssize_t dump_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
60 {
61 DumpState *s = DO_UPCAST(DumpState, nc, nc);
62 struct pcap_sf_pkthdr hdr;
63 int64_t ts;
64 int caplen;
65
66 /* Early return in case of previous error. */
67 if (s->fd < 0) {
68 return size;
69 }
70
71 ts = muldiv64(qemu_get_clock_ns(vm_clock), 1000000, get_ticks_per_sec());
72 caplen = size > s->pcap_caplen ? s->pcap_caplen : size;
73
74 hdr.ts.tv_sec = ts / 1000000 + s->start_ts;
75 hdr.ts.tv_usec = ts % 1000000;
76 hdr.caplen = caplen;
77 hdr.len = size;
78 if (write(s->fd, &hdr, sizeof(hdr)) != sizeof(hdr) ||
79 write(s->fd, buf, caplen) != caplen) {
80 qemu_log("-net dump write error - stop dump\n");
81 close(s->fd);
82 s->fd = -1;
83 }
84
85 return size;
86 }
87
88 static void dump_cleanup(VLANClientState *nc)
89 {
90 DumpState *s = DO_UPCAST(DumpState, nc, nc);
91
92 close(s->fd);
93 }
94
95 static NetClientInfo net_dump_info = {
96 .type = NET_CLIENT_TYPE_DUMP,
97 .size = sizeof(DumpState),
98 .receive = dump_receive,
99 .cleanup = dump_cleanup,
100 };
101
102 static int net_dump_init(VLANState *vlan, const char *device,
103 const char *name, const char *filename, int len)
104 {
105 struct pcap_file_hdr hdr;
106 VLANClientState *nc;
107 DumpState *s;
108 struct tm tm;
109 int fd;
110
111 fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, 0644);
112 if (fd < 0) {
113 error_report("-net dump: can't open %s", filename);
114 return -1;
115 }
116
117 hdr.magic = PCAP_MAGIC;
118 hdr.version_major = 2;
119 hdr.version_minor = 4;
120 hdr.thiszone = 0;
121 hdr.sigfigs = 0;
122 hdr.snaplen = len;
123 hdr.linktype = 1;
124
125 if (write(fd, &hdr, sizeof(hdr)) < sizeof(hdr)) {
126 error_report("-net dump write error: %s", strerror(errno));
127 close(fd);
128 return -1;
129 }
130
131 nc = qemu_new_net_client(&net_dump_info, vlan, NULL, device, name);
132
133 snprintf(nc->info_str, sizeof(nc->info_str),
134 "dump to %s (len=%d)", filename, len);
135
136 s = DO_UPCAST(DumpState, nc, nc);
137
138 s->fd = fd;
139 s->pcap_caplen = len;
140
141 qemu_get_timedate(&tm, 0);
142 s->start_ts = mktime(&tm);
143
144 return 0;
145 }
146
147 int net_init_dump(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan)
148 {
149 int len;
150 const char *file;
151 char def_file[128];
152
153 assert(vlan);
154
155 file = qemu_opt_get(opts, "file");
156 if (!file) {
157 snprintf(def_file, sizeof(def_file), "qemu-vlan%d.pcap", vlan->id);
158 file = def_file;
159 }
160
161 len = qemu_opt_get_size(opts, "len", 65536);
162
163 return net_dump_init(vlan, "dump", name, file, len);
164 }