net: move dump backend code from net.c to net/dump.c

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 151 insertions, 0 deletions

diff --git a/net/dump.c b/net/dump.c
new file mode 100644
index 0000000000..05a102be05
--- /dev/null
+++ b/net/dump.c
@@ -0,0 +1,151 @@
+/*
+ * QEMU System Emulator
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "dump.h"
+#include "qemu-common.h"
+#include "sysemu.h"
+#include "qemu-log.h"
+
+typedef struct DumpState {
+    VLANClientState *pcap_vc;
+    int fd;
+    int pcap_caplen;
+} DumpState;
+
+#define PCAP_MAGIC 0xa1b2c3d4
+
+struct pcap_file_hdr {
+    uint32_t magic;
+    uint16_t version_major;
+    uint16_t version_minor;
+    int32_t thiszone;
+    uint32_t sigfigs;
+    uint32_t snaplen;
+    uint32_t linktype;
+};
+
+struct pcap_sf_pkthdr {
+    struct {
+        int32_t tv_sec;
+        int32_t tv_usec;
+    } ts;
+    uint32_t caplen;
+    uint32_t len;
+};
+
+static ssize_t dump_receive(VLANClientState *vc, const uint8_t *buf, size_t size)
+{
+    DumpState *s = vc->opaque;
+    struct pcap_sf_pkthdr hdr;
+    int64_t ts;
+    int caplen;
+
+    /* Early return in case of previous error. */
+    if (s->fd < 0) {
+        return size;
+    }
+
+    ts = muldiv64(qemu_get_clock(vm_clock), 1000000, get_ticks_per_sec());
+    caplen = size > s->pcap_caplen ? s->pcap_caplen : size;
+
+    hdr.ts.tv_sec = ts / 1000000;
+    hdr.ts.tv_usec = ts % 1000000;
+    hdr.caplen = caplen;
+    hdr.len = size;
+    if (write(s->fd, &hdr, sizeof(hdr)) != sizeof(hdr) ||
+        write(s->fd, buf, caplen) != caplen) {
+        qemu_log("-net dump write error - stop dump\n");
+        close(s->fd);
+        s->fd = -1;
+    }
+
+    return size;
+}
+
+static void net_dump_cleanup(VLANClientState *vc)
+{
+    DumpState *s = vc->opaque;
+
+    close(s->fd);
+    qemu_free(s);
+}
+
+static int net_dump_init(VLANState *vlan, const char *device,
+                         const char *name, const char *filename, int len)
+{
+    struct pcap_file_hdr hdr;
+    DumpState *s;
+
+    s = qemu_malloc(sizeof(DumpState));
+
+    s->fd = open(filename, O_CREAT | O_WRONLY | O_BINARY, 0644);
+    if (s->fd < 0) {
+        qemu_error("-net dump: can't open %s\n", filename);
+        return -1;
+    }
+
+    s->pcap_caplen = len;
+
+    hdr.magic = PCAP_MAGIC;
+    hdr.version_major = 2;
+    hdr.version_minor = 4;
+    hdr.thiszone = 0;
+    hdr.sigfigs = 0;
+    hdr.snaplen = s->pcap_caplen;
+    hdr.linktype = 1;
+
+    if (write(s->fd, &hdr, sizeof(hdr)) < sizeof(hdr)) {
+        qemu_error("-net dump write error: %s\n", strerror(errno));
+        close(s->fd);
+        qemu_free(s);
+        return -1;
+    }
+
+    s->pcap_vc = qemu_new_vlan_client(NET_CLIENT_TYPE_DUMP,
+                                      vlan, NULL, device, name, NULL,
+                                      dump_receive, NULL, NULL,
+                                      net_dump_cleanup, s);
+    snprintf(s->pcap_vc->info_str, sizeof(s->pcap_vc->info_str),
+             "dump to %s (len=%d)", filename, len);
+    return 0;
+}
+
+int net_init_dump(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan)
+{
+    int len;
+    const char *file;
+    char def_file[128];
+
+    assert(vlan);
+
+    file = qemu_opt_get(opts, "file");
+    if (!file) {
+        snprintf(def_file, sizeof(def_file), "qemu-vlan%d.pcap", vlan->id);
+        file = def_file;
+    }
+
+    len = qemu_opt_get_size(opts, "len", 65536);
+
+    return net_dump_init(vlan, "dump", name, file, len);
+}