Request for new LINKTYPE_* code LINKTYPE_AUERSWALD_LOG

[developer--- via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

> --- Begin Message ---
>
>
> From: "developer () auerswald de" <developer () auerswald de>
>
> Date: Fri, 12 Feb 2021 12:49:32 +0000
>
>
> Sorry for the delay in responding, I had to look thru the code to make sure all the information is accurate.
>
> I looked into the option to change in particular the  msg_type 1 (decoded SIP message),
> but for the short term, using export_pdu is not an option because of the changes required.
>
> The current implementation for the LINKTYPE_AUERSWALD_LOG uses the following format:
>
> Each package starts with a message header followed by the payload and a 0 byte.
> The message header currently has a fixed width of 150 bytes.
> For the future the length of the header might change based on the msg_type.
> (This will allow for less waste compared to the fix length)
> Whenever the content structure of the message or length of header is changed
> a new msg_type will be used.
>
> /* Literals for displaying level are
> local level_tab = {
>   [0] = "Off",
>   [1] = "Error",
>   [2] = "Warning",
>   [3] = "Info",
>   [4] = "Debug",
>   [5] = "EDebug"
> }
> */
>
> // The Offset in comments is just for convenience for writing wireshark dissectors
> struct message_hdr {
>     uint16_t msg_type;              // Offset 0
>     uint32_t level;                 // Offset 2
>     char     category[32];          // Offset 6
>   union {                           // New Offsetbase 38
>     struct {                    // if msg_type == 0
>       int32_t  pid;                 // Offset 38
>       int32_t  tgid;                // Offset 42
>       char     procname[16];        // Offset 46
>       char     threadname[16];      // Offset 62
>       char     class_name[32];      // Offset 78
>       char     method[32];          // Offset 110
>       uint32_t lineno;              // Offset 142
>       uint32_t seqno;               // Offset 146
>     };
>     struct {                    // if msg_type == 1
>       char     src_ip[16];          // Offset 38
>       uint16_t src_port;            // Offset 54
>       char     dst_ip[16];          // Offset 56
>       uint16_t dst_port;            // Offset 72
>     };
>   };
> } __attribute__((packed));        // Total 150
>
>
>
> ________________________________
>
> --- End Message ---
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