** Changed in: qemu
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/2054889
Title:
pcap streams are text files which insert 0xD in Windows version
Status in QEMU:
Confirmed
Bug description:
Since Windows text files use CRLFs for all \n, the Windows version of
QEMU inserts a CR in the PCAP stream when a LF is encountered when
using USB PCAP files.
Starting at line 275 in hw/usb/bus (https://gitlab.com/qemu-
project/qemu/-/blob/master/hw/usb/bus.c?ref_type=heads#L275), the file
is opened as text instead of binary.
I think the following patch would fix the issue:
if (dev->pcap_filename) {
- int fd = qemu_open_old(dev->pcap_filename, O_CREAT | O_WRONLY |
O_TRUNC, 0666);
+ int fd = qemu_open_old(dev->pcap_filename, O_CREAT | O_WRONLY |
O_TRUNC | O_BINARY, 0666);
if (fd < 0) {
error_setg(errp, "open %s failed", dev->pcap_filename);
usb_qdev_unrealize(qdev);
return;
}
- dev->pcap = fdopen(fd, "w");
+ dev->pcap = fdopen(fd, "wb");
usb_pcap_init(dev->pcap);
}
To show an example, when using a very common protocol to USB disks,
the BBB protocol uses a 10-byte command packet. For example, the
READ_CAPACITY(10) command (implemented at https://gitlab.com/qemu-
project/qemu/-/blob/master/hw/scsi/scsi-disk.c#L2068) will have a
command block length of 10 (0xA). When this 10-byte command (part of
the 31-byte CBW) is placed into the PCAP file, the Windows file
manager inserts a 0xD before the 0xA, turning the 31-byte CBW into a
32-byte CBW.
Actual CBW:
0040 55 53 42 43 01 00 00 00 08 00 00 00 80 00 0a 25 USBC............
0050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 %..............
PCAP CBW
0040 55 53 42 43 01 00 00 00 08 00 00 00 80 00 0d 0a USBC............
0050 25 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 %..............
I believe simply opening the PCAP file as BINARY instead of TEXT will
fix this issue.
Thank you.
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