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; }