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Added support for HPUX11 NETTL captures for the NS_LS_DRIVER type. 

It works for such captures containing 100baseT captures. It may explode on
other link types.

svn path=/trunk/; revision=5496
This commit is contained in:
Ronnie Sahlberg 2002-05-17 09:53:20 +00:00
parent f58590ef4c
commit bd351e3709
1 changed files with 108 additions and 1 deletions
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109
wiretap/nettl.c
View File

@ -1,6 +1,6 @@
/* nettl.c
*
* $Id: nettl.c,v 1.26 2002/04/09 08:15:04 guy Exp $
* $Id: nettl.c,v 1.27 2002/05/17 09:53:20 sahlberg Exp $
*
* Wiretap Library
* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
@ -66,6 +66,71 @@ struct nettlrec_ns_ls_ip_hdr {
/* header is followed by data and once again the total length (2 bytes) ! */
/* NL_LS_DRIVER :
The following shows what the header looks like for NS_LS_DRIVER
The capture was taken on HPUX11 and for a 100baseT interface.
000080 00 44 00 0b 00 00 00 02 00 00 00 00 20 00 00 00
000090 00 00 00 00 00 00 04 06 00 00 00 00 00 00 00 00
0000a0 00 00 00 74 00 00 00 74 3c e3 76 19 00 06 34 63
0000b0 ff ff ff ff 00 00 00 00 00 00 00 00 ff ff ff ff
0000c0 00 00 00 00 00 00 01 02 00 5c 00 5c ff ff ff ff
0000d0 3c e3 76 19 00 06 34 5a 00 0b 00 14 <here starts the MAC heder>
Each entry starts with 0x0044000b
The values 0x005c at position 0x0000c8 and 0x0000ca matches the number of bytes in
the packet up to the next entry, which starts with 0x00440b again. These probably
indicate the real and captured length of the packet (order unknown)
The values 0x00000074 at positions 0x0000a0 and 0x0000a4 seems to indicate
the same number as positions 0x0000c8 and 0x0000ca but added with 24.
Perhaps we have here two layers of headers.
The first layer is fixed and consists of all the bytes from 0x000084 up to and
including 0x0000c3 which is a generic header for all packets captured from any
device. This header might be of fixed size 64 bytes and there might be something in
it which indicates the type of the next header which is link type specific.
Following this header there is another header for the 100baseT interface which
in this case is 24 bytes long spanning positions 0x0000c4 to 0x0000db.
When someone reports that the loading of the captures breaks, we can compare
this header above with what he/she got to learn how to distinguish between different
types of link specific headers.
For now:
The first header seems to be
0-27 unknown
28-31 length1
32-35 length2
36-39 secs
40-43 100 x nsecs
44-63 unknown
The header for 100baseT seems to be
0-3 unknown
4-5 length1 these are probably total/captured len. unknown which.
6-7 length2
8-11 unknown
12-15 secs
16-19 100 x nsec
20-23 unknown
*/
struct nettlrec_ns_ls_drv_hdr {
guint8 xxa[64];
};
struct nettlrec_ns_ls_drv_eth_hdr {
guint8 xxa[4];
guint8 length[2];
guint8 length2[2];
guint8 xxb[4];
guint8 sec[4];
guint8 cnsec[4]; /* unit of 100 nsec */
guint8 xxc[4];
};
static gboolean nettl_read(wtap *wth, int *err, long *data_offset);
static gboolean nettl_seek_read(wtap *wth, long seek_off,
union wtap_pseudo_header *pseudo_header, u_char *pd,
@ -195,6 +260,8 @@ nettl_read_rec_header(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr,
int bytes_read;
struct nettlrec_sx25l2_hdr lapb_hdr;
struct nettlrec_ns_ls_ip_hdr ip_hdr;
struct nettlrec_ns_ls_drv_hdr drv_hdr;
struct nettlrec_ns_ls_drv_eth_hdr drv_eth_hdr;
guint16 length;
int offset = 0;
guint8 encap[4];
@ -262,6 +329,46 @@ nettl_read_rec_header(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr,
phdr->ts.tv_sec = pntohl(&ip_hdr.sec);
phdr->ts.tv_usec = pntohl(&ip_hdr.usec);
break;
case NETTL_SUBSYS_NS_LS_DRIVER :
bytes_read = file_read(&drv_hdr, 1, sizeof drv_hdr, fh);
if (bytes_read != sizeof drv_hdr) {
*err = file_error(fh);
if (*err != 0)
return -1;
if (bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
return -1;
}
return 0;
}
offset += sizeof drv_hdr;
/* XXX we dont know how to identify this as ehternet frames, so
we assumes everything is. We will crash and burn for anything else */
/* for encapsulated 100baseT we do this */
phdr->pkt_encap = WTAP_ENCAP_ETHERNET;
bytes_read = file_read(&drv_eth_hdr, 1, sizeof drv_eth_hdr, fh);
if (bytes_read != sizeof drv_eth_hdr) {
*err = file_error(fh);
if (*err != 0)
return -1;
if (bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
return -1;
}
return 0;
}
offset += sizeof drv_eth_hdr;
length = pntohl(&drv_eth_hdr.length);
if (length <= 0) return 0;
phdr->len = length;
phdr->caplen = length;
phdr->ts.tv_sec = pntohl(&drv_eth_hdr.sec);
phdr->ts.tv_usec = pntohl(&drv_eth_hdr.cnsec)/10;
break;
case NETTL_SUBSYS_SX25L2 :
phdr->pkt_encap = WTAP_ENCAP_LAPB;