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wireshark/wiretap/iseries.c
Guy Harris 0734ac385f Rename buffer_ routines to ws_buffer_ to avoid name collisions. 
In particular, epan/wslua/lrexlib.c has its own buffer_ routines,
causing some linker warnings on some platforms, as reported in bug
10332.

(Not to be backported to 1.12, as that would change the API and ABI of
libwsutil and libwiretap.  We should also make the buffer_ routines in
epan/wslua/lrexlib.c static, which should also address this problem, but
the name change avoids other potential namespace collisions.)

Change-Id: I1d42c7d1778c7e4c019deb2608d476c52001ce28
Reviewed-on: https://code.wireshark.org/review/3351
Reviewed-by: Guy Harris <guy@alum.mit.edu>
2014-08-02 11:01:29 +00:00

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/* iseries.c
*
* Wiretap Library
* Copyright (c) 2011 by Martin Warnes <Martin_Warnes@uk.ibm.com>
*
* Based on toshiba.c and vms.c
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* This module will read the contents of the iSeries (OS/400) Communication trace
* Both ASCII & Unicode formatted traces are supported.
*
* iSeries Comms traces consist of a header page and a subsequent number of packet records
*
* The header page contains details on the options set during running of the trace,
* currently the following options are a requirement for this module:
*
* 1. Object protocol = ETHERNET (Default)
* 2. ASCII or UNICODE file formats.
*
* The above can be acheived by passing option ASCII(*YES) with the trace command
*
*/
/* iSeries header page
COMMUNICATIONS TRACE Title: OS400 - OS400 trace 10/28/05 11:44:50 Page: 1
Trace Description . . . . . : OS400 - OS400 trace
Configuration object . . . . : ETH0
Type . . . . . . . . . . . . : 1 1=Line, 2=Network Interface
3=Network server
Object protocol . . . . . . : ETHERNET
Start date/Time . . . . . . : 10/28/05 11:43:00.341
End date/Time . . . . . . . : 10/28/05 11:44:22.148
Bytes collected . . . . . . : 11999
Buffer size . . . . . . . . : 2048 kilobytes
Data direction . . . . . . . : 3 1=Sent, 2=Received, 3=Both
Stop on buffer full . . . . : Y Y=Yes, N=No
Number of bytes to trace
Beginning bytes . . . . . : *MAX Value, *CALC, *MAX
Ending bytes . . . . . . : *CALC Value, *CALC
Controller name . . . . . . : *ALL *ALL, name
Data representation . . . . : 1 1=ASCII, 2=EBCDIC, 3=*CALC
Format SNA data only . . . . : N Y=Yes, N=No
Format RR, RNR commands . . : N Y=Yes, N=No
Format TCP/IP data only . . : Y Y=Yes, N=No
IP address . . . . . . . . : *ALL *ALL, address
IP address . . . . . . . . : *ALL *ALL, address
IP port . . . . . . . . . : *ALL *ALL, IP port
Format UI data only . . . . : N Y=Yes, N=No
Select Ethernet data . . . . : 3 1=802.3, 2=ETHV2, 3=Both
Format Broadcast data . . . : Y Y=Yes, N=No
*/
/* iSeries IPv4 formatted packet records consist of a packet header line
* identifying the packet number, direction, size, timestamp,
* source/destination MAC addresses and packet type.
*
* Thereafter there will be a formated display of the headers above
* the link layer, such as ARP, IP, TCP, UDP, and ICMP (all but
* ICMP have either been seen in captures or on pages such as the ones
* at
*
* http://www-912.ibm.com/s_dir/SLKBase.nsf/1ac66549a21402188625680b0002037e/e05fb0515bc3449686256ce600512c37?OpenDocument
*
* and
*
* http://publib.boulder.ibm.com/infocenter/javasdk/v5r0/index.jsp?topic=%2Fcom.ibm.java.doc.diagnostics.50%2Fdiag%2Fproblem_determination%2Fi5os_perf_io_commstrace.html
*
* so we cannot assume that "IP Header" or "TCP Header" will appear). The
* formatted display includes lines that show the contents of some of the
* fields in the header, as well as hex strings dumps of the headers
* themselves, with tags such as "IP Header :", "ARP Header :",
* "TCP Header :", "UDP Header :", and (presumably) "ICMP Header:".
*
* If the packet contains data this is displayed as 4 groups of 16 hex digits
* followed by an ASCII representaion of the data line.
*
* Information from the packet header line, higher-level headers and, if
* available, data lines are extracted by the module for displaying.
*
*
Record Data Record Controller Destination Source Frame
Number S/R Length Timer Name MAC Address MAC Address Format
------ --- ------ --------------- ---------- ------------ ------------ ------
8 S 145 11:43:59.82956 0006299C14AE 0006299C14FE ETHV2 Type: 0800
Frame Type : IP DSCP: 0 ECN: 00-NECT Length: 145 Protocol: TCP Datagram ID: 388B
Src Addr: 10.20.144.150 Dest Addr: 10.20.144.151 Fragment Flags: DON'T,LAST
IP Header : 45000091388B40004006CC860A1490960A149097
IP Options : NONE
TCP . . . : Src Port: 6006,Unassigned Dest Port: 35366,Unassigned
SEQ Number: 2666470699 ('9EEF1D2B'X) ACK Number: 2142147535 ('7FAE93CF'X)
Code Bits: ACK PSH Window: 32648 TCP Option: NO OP
TCP Header : 17768A269EEF1D2B7FAE93CF80187F885B5600000101080A0517E0F805166DE0
Data . . . . . : 5443503200020010 0000004980000000 B800000080470103 01001E0000002000 *TCP2.......I*...*...*G........ .*
002F010080000004 0300800700C00600 4002008000000304 00800000060FB067 *./..*.....*..*..@..*.....*....*G*
FC276228786B3EB0 EF34F5F1D27EF8DF 20926820E7B322AA 739F1FB20D **'B(XK>**4***.** *H **"*S*.*. *
*/
/* iSeries IPv6 formatted traces are similar to the IPv4 version above,
* except that the higher-level headers have "IPv6 Header:" and
* "ICMPv6 Hdr:", and data data is no longer output in groups of 16 hex
* digits.
*
Record Data Record Destination Source Frame
Number S/R Length Timer MAC Address MAC Address Format
------ --- ------ ------------ ------------ ------------ ------
218 S 1488 15:01:14.389 0011BC358680 00096B6BD918 ETHV2 Type: 86DD
IPv6 Data: Ver: 06 Traffic Class: 00 Flow Label: 000000
Payload Length: 1448 Next Header: 06,TCP Hop Limit: 64
Src Addr: fd00:0:0:20f2::122
Dest Addr: fd00:0:0:20a0::155
IPv6 Header: 6000000005A80640FD000000000020F20000000000000122FD000000000020A0
0000000000000155
TCP . . . : Src Port: 21246,Unassigned Dest Port: 13601,Unassigned
SEQ Number: 2282300877 ('880925CD'X) ACK Number: 3259003715 ('C2407343'X)
Code Bits: ACK Window: 65535 TCP Option: NO OP
TCP Header : 52FE3521880925CDC24073438010FFFFCFBB00000101080A0E15127000237A08
Data . . . . . : 54435032000200140000061880000000ECBEB867F0000000004CE640E6C1D9D5 *TCP2........*...***g*....L*@*****
C9D5C740E3C8C9E240C9E240E3C8C540E6C1D9D5C9D5C740C6C9C5D3C4404040 ****@****@**@***@*******@*****@@@*
4040404040404040404040404040404040404040404040404040404040404040 *@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*
*/
/* iSeries unformatted packet record consist of the same header record as
* the formatted trace but all other records are simply unformatted data
* containing higher-level headers and packet data combined.
*
Record Data Record Controller Destination Source Frame Number Number Poll/
Number S/R Length Timer Name MAC Address MAC Address Format Command Sent Received Final DSAP SSAP
------ --- ------ --------------- ---------- ------------ ------------ ------ ------- ------ -------- ----- ---- ----
1 R 64 12:19:29.97108 000629ECF48E 0006D78E23C2 ETHV2 Type: 0800
Data . . . . . : 4500003C27954000 3A06CE3D9797440F 0A5964EAC4F50554 58C9915500000000 *E..<'*@.:.*=**D..YD***.TX**U....*
A00216D06A200000 020405B40402080A 1104B6C000000000 010303000B443BF1 **..*J .....*......**.........D;**
*/
#include "config.h"
#include "wtap-int.h"
#include <wsutil/buffer.h>
#include "iseries.h"
#include "file_wrappers.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <wsutil/str_util.h>
#define ISERIES_HDR_MAGIC_STR "COMMUNICATIONS TRACE"
#define ISERIES_HDR_MAGIC_LEN 20
#define ISERIES_LINE_LENGTH 270
#define ISERIES_HDR_LINES_TO_CHECK 100
#define ISERIES_PKT_LINES_TO_CHECK 4
#define ISERIES_MAX_PACKET_LEN 16384
#define ISERIES_MAX_TRACE_LEN 99999999
#define ISERIES_PKT_ALLOC_SIZE (pkt_len*2)+1
#define ISERIES_FORMAT_ASCII 1
#define ISERIES_FORMAT_UNICODE 2
typedef struct {
gboolean have_date; /* TRUE if we found a capture start date */
int year, month, day; /* The start date */
int format; /* Trace format type */
} iseries_t;
static gboolean iseries_read (wtap * wth, int *err, gchar ** err_info,
gint64 *data_offset);
static gboolean iseries_seek_read (wtap * wth, gint64 seek_off,
struct wtap_pkthdr *phdr,
Buffer * buf, int *err, gchar ** err_info);
static gboolean iseries_check_file_type (wtap * wth, int *err, gchar **err_info,
int format);
static gint64 iseries_seek_next_packet (wtap * wth, int *err, gchar **err_info);
static gboolean iseries_parse_packet (wtap * wth, FILE_T fh,
struct wtap_pkthdr *phdr,
Buffer * buf, int *err, gchar ** err_info);
static int iseries_UNICODE_to_ASCII (guint8 * buf, guint bytes);
static gboolean iseries_parse_hex_string (const char * ascii, guint8 * buf,
size_t len);
int
iseries_open (wtap * wth, int *err, gchar ** err_info)
{
int bytes_read;
gint offset;
char magic[ISERIES_LINE_LENGTH];
char unicodemagic[] =
{ '\x43', '\x00', '\x4F', '\x00', '\x4D',
'\x00', '\x4D', '\x00', '\x55', '\x00', '\x4E', '\x00', '\x49', '\x00',
'\x43', '\x00', '\x41'
};
/*
* Check that file starts with a valid iSeries COMMS TRACE header
* by scanning for it in the first line
*/
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read (&magic, sizeof magic, wth->fh);
if (bytes_read != sizeof magic)
{
*err = file_error (wth->fh, err_info);
if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
return -1;
return 0;
}
/*
* Check if this is a UNICODE formatted file by scanning for the magic string
*/
offset=0;
while ((unsigned int)offset < (ISERIES_LINE_LENGTH - (sizeof unicodemagic)))
{
if (memcmp (magic + offset, unicodemagic, sizeof unicodemagic) == 0) {
if (file_seek (wth->fh, 0, SEEK_SET, err) == -1)
{
return 0;
}
/*
* Do some basic sanity checking to ensure we can handle the
* contents of this trace
*/
if (!iseries_check_file_type (wth, err, err_info, ISERIES_FORMAT_UNICODE))
{
if (*err == 0)
return 0;
else
return -1;
}
wth->file_encap = WTAP_ENCAP_ETHERNET;
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_ISERIES;
wth->snapshot_length = 0;
wth->subtype_read = iseries_read;
wth->subtype_seek_read = iseries_seek_read;
wth->tsprecision = WTAP_FILE_TSPREC_USEC;
if (file_seek (wth->fh, 0, SEEK_SET, err) == -1)
{
return 0;
}
return 1;
}
offset += 1;
}
/*
* Check if this is a ASCII formatted file by scanning for the magic string
*/
offset=0;
while (offset < (ISERIES_LINE_LENGTH - ISERIES_HDR_MAGIC_LEN))
{
if (memcmp (magic + offset, ISERIES_HDR_MAGIC_STR, ISERIES_HDR_MAGIC_LEN) == 0)
{
if (file_seek (wth->fh, 0, SEEK_SET, err) == -1)
{
return 0;
}
/*
* Do some basic sanity checking to ensure we can handle the
* contents of this trace
*/
if (!iseries_check_file_type (wth, err, err_info, ISERIES_FORMAT_ASCII))
{
if (*err == 0)
return 0;
else
return -1;
}
wth->file_encap = WTAP_ENCAP_ETHERNET;
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_ISERIES;
wth->snapshot_length = 0;
wth->subtype_read = iseries_read;
wth->subtype_seek_read = iseries_seek_read;
wth->tsprecision = WTAP_FILE_TSPREC_USEC;
if (file_seek (wth->fh, 0, SEEK_SET, err) == -1)
{
return 0;
}
return 1;
}
offset += 1;
}
/* Neither ASCII or UNICODE so not supported */
return 0;
}
/*
* Do some basic sanity checking to ensure we can handle the
* contents of this trace by checking the header page for
* requisit requirements and additional information.
*/
static gboolean
iseries_check_file_type (wtap * wth, int *err, gchar **err_info, int format)
{
guint line;
int num_items_scanned;
char buf[ISERIES_LINE_LENGTH], protocol[9];
iseries_t *iseries;
/* Save trace format for passing between packets */
iseries = (iseries_t *) g_malloc (sizeof (iseries_t));
wth->priv = (void *) iseries;
iseries->have_date = FALSE;
iseries->format = format;
for (line = 0; line < ISERIES_HDR_LINES_TO_CHECK; line++)
{
if (file_gets (buf, ISERIES_LINE_LENGTH, wth->fh) == NULL)
{
/* EOF or error. */
*err = file_error (wth->fh, err_info);
if (*err == WTAP_ERR_SHORT_READ)
*err = 0;
return FALSE;
}
/*
* Check that we are dealing with an ETHERNET trace
*/
if (iseries->format == ISERIES_FORMAT_UNICODE)
{
iseries_UNICODE_to_ASCII ((guint8 *)buf, ISERIES_LINE_LENGTH);
}
ascii_strup_inplace (buf);
num_items_scanned = sscanf (buf,
"%*[ \n\t]OBJECT PROTOCOL%*[ .:\n\t]%8s",
protocol);
if (num_items_scanned == 1)
{
if (memcmp (protocol, "ETHERNET", 8) != 0)
return FALSE;
}
/*
* The header is the only place where the date part of the timestamp is held, so
* extract it here and store for all packets to access
*/
num_items_scanned = sscanf (buf,
"%*[ \n\t]START DATE/TIME%*[ .:\n\t]%2d/%2d/%2d",
&iseries->month, &iseries->day,
&iseries->year);
if (num_items_scanned == 3)
{
iseries->have_date = TRUE;
}
}
*err = 0;
return TRUE;
}
/*
* Find the next packet and parse it; called from wtap_read().
*/
static gboolean
iseries_read (wtap * wth, int *err, gchar ** err_info, gint64 *data_offset)
{
gint64 offset;
/*
* Locate the next packet
*/
offset = iseries_seek_next_packet (wth, err, err_info);
if (offset < 0)
return FALSE;
*data_offset = offset;
/*
* Parse the packet and extract the various fields
*/
return iseries_parse_packet (wth, wth->fh, &wth->phdr, wth->frame_buffer,
err, err_info);
}
/*
* Seeks to the beginning of the next packet, and returns the
* byte offset. Returns -1 on failure or EOF; on EOF, sets
* *err to 0, and, on failure, sets *err to the error and *err_info
* to null or an additional error string.
*/
static gint64
iseries_seek_next_packet (wtap * wth, int *err, gchar **err_info)
{
iseries_t *iseries = (iseries_t *)wth->priv;
char buf[ISERIES_LINE_LENGTH],type[5];
int line, num_items_scanned;
gint64 cur_off;
long buflen;
for (line = 0; line < ISERIES_MAX_TRACE_LEN; line++)
{
if (file_gets (buf, ISERIES_LINE_LENGTH, wth->fh) == NULL)
{
/* EOF or error. */
*err = file_error (wth->fh, err_info);
return -1;
}
/* Convert UNICODE to ASCII if required and determine */
/* the number of bytes to rewind to beginning of record. */
if (iseries->format == ISERIES_FORMAT_UNICODE)
{
/* buflen is #bytes to 1st 0x0A */
buflen = iseries_UNICODE_to_ASCII ((guint8 *) buf, ISERIES_LINE_LENGTH);
}
else
{
/* Else buflen is just length of the ASCII string */
buflen = (long) strlen (buf);
}
ascii_strup_inplace (buf);
/* If packet header found return the offset */
num_items_scanned =
sscanf (buf+78,
"%*[ \n\t]ETHV2%*[ .:\n\t]TYPE%*[ .:\n\t]%4s",type);
if (num_items_scanned == 1)
{
/* Rewind to beginning of line */
cur_off = file_tell (wth->fh);
if (cur_off == -1)
{
*err = file_error (wth->fh, err_info);
return -1;
}
if (file_seek (wth->fh, cur_off - buflen, SEEK_SET, err) == -1)
{
return -1;
}
return cur_off - buflen;
}
}
*err = WTAP_ERR_BAD_FILE;
*err_info =
g_strdup_printf ("iseries: next packet header not found within %d lines",
ISERIES_MAX_TRACE_LEN);
return -1;
}
/*
* Read packets in random-access fashion
*/
static gboolean
iseries_seek_read (wtap * wth, gint64 seek_off, struct wtap_pkthdr *phdr,
Buffer * buf, int *err, gchar ** err_info)
{
/* seek to packet location */
if (file_seek (wth->random_fh, seek_off - 1, SEEK_SET, err) == -1)
return FALSE;
/*
* Parse the packet and extract the various fields
*/
return iseries_parse_packet (wth, wth->random_fh, phdr, buf,
err, err_info);
}
static int
append_hex_digits(char *ascii_buf, int ascii_offset, int max_offset,
char *data, int *err, gchar **err_info)
{
int in_offset, out_offset;
int c;
unsigned int i;
gboolean overflow = FALSE;
in_offset = 0;
out_offset = ascii_offset;
for (;;)
{
/*
* Process a block of up to 16 hex digits.
* The block is terminated early by an end-of-line indication (NUL,
* CR, or LF), by a space (which terminates the last block of the
* data we're processing), or by a "*", which introduces the ASCII representation
* of the data.
* All characters in the block must be upper-case hex digits;
* there might or might not be a space *after* a block, but, if so,
* that will be skipped over after the block is processed.
*/
for (i = 0; i < 16; i++, in_offset++)
{
/*
* If we see an end-of-line indication, or an early-end-of-block
* indication (space), we're done. (Only the last block ends
* early.)
*/
c = data[in_offset] & 0xFF;
if (c == '\0' || c == ' ' || c == '*' || c == '\r' || c == '\n')
{
goto done;
}
if (!isxdigit(c) || islower(c))
{
/*
* Not a hex digit, or a lower-case hex digit.
* Treat this as an indication that the line isn't a data
* line, so we just ignore it.
*
* XXX - do so only for continuation lines; treat non-hex-digit
* characters as errors for other lines?
*/
return ascii_offset; /* pretend we appended nothing */
}
if (out_offset >= max_offset)
overflow = TRUE;
else
{
ascii_buf[out_offset] = c;
out_offset++;
}
}
/*
* Skip blanks, if any.
*/
for (; (data[in_offset] & 0xFF) == ' '; in_offset++)
;
}
done:
/*
* If we processed an *odd* number of hex digits, report an error.
*/
if ((i % 2) != 0)
{
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup("iseries: odd number of hex digits in a line");
return -1;
}
if (overflow)
{
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup("iseries: more packet data than the packet length indicated");
return -1;
}
return out_offset;
}
/* Parses a packet. */
static gboolean
iseries_parse_packet (wtap * wth, FILE_T fh, struct wtap_pkthdr *phdr,
Buffer *buf, int *err, gchar **err_info)
{
iseries_t *iseries = (iseries_t *)wth->priv;
gint64 cur_off;
gboolean isValid, isCurrentPacket;
int num_items_scanned, line, pktline, buflen;
int pkt_len, pktnum, hr, min, sec;
char direction[2], destmac[13], srcmac[13], type[5], csec[9+1];
char data[ISERIES_LINE_LENGTH * 2];
int offset;
char *ascii_buf;
int ascii_offset;
struct tm tm;
/*
* Check for packet headers in first 3 lines this should handle page breaks
* situations and the header lines output at each page throw and ensure we
* read both the captured and packet lengths.
*/
isValid = FALSE;
for (line = 1; line < ISERIES_PKT_LINES_TO_CHECK; line++)
{
if (file_gets (data, ISERIES_LINE_LENGTH, fh) == NULL)
{
*err = file_error (fh, err_info);
return FALSE;
}
/* Convert UNICODE data to ASCII */
if (iseries->format == ISERIES_FORMAT_UNICODE)
{
iseries_UNICODE_to_ASCII ((guint8 *)data, ISERIES_LINE_LENGTH);
}
ascii_strup_inplace (data);
num_items_scanned =
sscanf (data,
"%*[ \n\t]%6d%*[ *\n\t]%1s%*[ \n\t]%6d%*[ \n\t]%2d:%2d:%2d.%9[0-9]%*[ \n\t]"
"%12s%*[ \n\t]%12s%*[ \n\t]ETHV2%*[ \n\t]TYPE:%*[ \n\t]%4s",
&pktnum, direction, &pkt_len, &hr, &min, &sec, csec, destmac,
srcmac, type);
if (num_items_scanned == 10)
{
/* OK! We found the packet header line */
isValid = TRUE;
/*
* XXX - The Capture length returned by the iSeries trace doesn't
* seem to include the Ethernet header, so we add its length here.
*/
pkt_len += 14;
break;
}
}
/*
* If no packet header found we exit at this point and inform the user.
*/
if (!isValid)
{
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup ("iseries: packet header isn't valid");
return FALSE;
}
phdr->rec_type = REC_TYPE_PACKET;
phdr->presence_flags = WTAP_HAS_CAP_LEN;
/*
* If we have Wiretap Header then populate it here
*
* Timer resolution on the iSeries is hardware dependent. We determine
* the resolution based on how many digits we see.
*/
if (iseries->have_date)
{
phdr->presence_flags |= WTAP_HAS_TS;
tm.tm_year = 100 + iseries->year;
tm.tm_mon = iseries->month - 1;
tm.tm_mday = iseries->day;
tm.tm_hour = hr;
tm.tm_min = min;
tm.tm_sec = sec;
tm.tm_isdst = -1;
phdr->ts.secs = mktime (&tm);
csec[sizeof(csec) - 1] = '\0';
switch (strlen(csec))
{
case 0:
phdr->ts.nsecs = 0;
break;
case 1:
phdr->ts.nsecs = atoi(csec) * 100000000;
break;
case 2:
phdr->ts.nsecs = atoi(csec) * 10000000;
break;
case 3:
phdr->ts.nsecs = atoi(csec) * 1000000;
break;
case 4:
phdr->ts.nsecs = atoi(csec) * 100000;
break;
case 5:
phdr->ts.nsecs = atoi(csec) * 10000;
break;
case 6:
phdr->ts.nsecs = atoi(csec) * 1000;
break;
case 7:
phdr->ts.nsecs = atoi(csec) * 100;
break;
case 8:
phdr->ts.nsecs = atoi(csec) * 10;
break;
case 9:
phdr->ts.nsecs = atoi(csec);
break;
}
}
phdr->len = pkt_len;
phdr->pkt_encap = WTAP_ENCAP_ETHERNET;
phdr->pseudo_header.eth.fcs_len = -1;
ascii_buf = (char *)g_malloc (ISERIES_PKT_ALLOC_SIZE);
g_snprintf(ascii_buf, ISERIES_PKT_ALLOC_SIZE, "%s%s%s", destmac, srcmac, type);
ascii_offset = 14*2; /* 14-byte Ethernet header, 2 characters per byte */
/*
* Start reading packet contents
*/
isCurrentPacket = TRUE;
/* loop through packet lines and breakout when the next packet header is read */
pktline = 0;
while (isCurrentPacket)
{
pktline++;
/* Read the next line */
if (file_gets (data, ISERIES_LINE_LENGTH, fh) == NULL)
{
*err = file_error (fh, err_info);
if (*err == 0)
{
/* Hit the EOF without an error */
break;
}
goto errxit;
}
/* Convert UNICODE data to ASCII and determine line length */
if (iseries->format == ISERIES_FORMAT_UNICODE)
{
buflen = iseries_UNICODE_to_ASCII ((guint8 *)data, ISERIES_LINE_LENGTH);
}
else
{
/* Else bytes to rewind is just length of ASCII string */
buflen = (int) strlen (data);
}
/*
* Skip leading white space.
*/
for (offset = 0; isspace((guchar)data[offset]); offset++)
;
/*
* The higher-level header information starts at an offset of
* 22 characters. The header tags are 14 characters long.
*
* XXX - for IPv6, if the next header isn't the last header,
* the intermediate headers do *NOT* appear to be shown in
* the dump file *at all*, so the packet *cannot* be
* reconstructed!
*/
if (offset == 22)
{
if (strncmp(data + 22, "IP Header : ", 14) == 0 ||
strncmp(data + 22, "IPv6 Header: ", 14) == 0 ||
strncmp(data + 22, "ARP Header : ", 14) == 0 ||
strncmp(data + 22, "TCP Header : ", 14) == 0 ||
strncmp(data + 22, "UDP Header : ", 14) == 0 ||
strncmp(data + 22, "ICMP Header: ", 14) == 0 ||
strncmp(data + 22, "ICMPv6 Hdr: ", 14) == 0 ||
strncmp(data + 22, "Option Hdr: ", 14) == 0)
{
ascii_offset = append_hex_digits(ascii_buf, ascii_offset,
ISERIES_PKT_ALLOC_SIZE - 1,
data + 22 + 14, err,
err_info);
if (ascii_offset == -1)
{
/* Bad line. */
return FALSE;
}
continue;
}
}
/*
* Is this a data line?
*
* The "Data" starts at an offset of 8.
*/
if (offset == 9)
{
if (strncmp(data + 9, "Data . . . . . : ", 18) == 0)
{
ascii_offset = append_hex_digits(ascii_buf, ascii_offset,
ISERIES_PKT_ALLOC_SIZE - 1,
data + 9 + 18, err,
err_info);
if (ascii_offset == -1)
{
/* Bad line. */
return FALSE;
}
continue;
}
}
/*
* Is this a continuation of a previous header or data line?
* That's blanks followed by hex digits; first try the
* "no column separators" form.
*
* Continuations of header lines begin at an offset of 36;
* continuations of data lines begin at an offset of 27.
*/
if (offset == 36 || offset == 27)
{
ascii_offset = append_hex_digits(ascii_buf, ascii_offset,
ISERIES_PKT_ALLOC_SIZE - 1,
data + offset, err,
err_info);
if (ascii_offset == -1)
{
/* Bad line. */
return FALSE;
}
continue;
}
/*
* If we see the identifier for the next packet then rewind and set
* isCurrentPacket FALSE
*/
ascii_strup_inplace (data);
/* If packet header found return the offset */
num_items_scanned =
sscanf (data+78,
"%*[ \n\t]ETHV2%*[ .:\n\t]TYPE%*[ .:\n\t]%4s",type);
if ((num_items_scanned == 1) && pktline > 1)
{
isCurrentPacket = FALSE;
cur_off = file_tell( fh);
if (cur_off == -1)
{
/* Error. */
*err = file_error (fh, err_info);
goto errxit;
}
if (file_seek (fh, cur_off - buflen, SEEK_SET, err) == -1)
{
/* XXX: need to set err_info ?? */
goto errxit;
}
}
}
ascii_buf[ascii_offset] = '\0';
/*
* Make the captured length be the amount of bytes we've read (which
* is half the number of characters of hex dump we have).
*
* XXX - this can happen for IPv6 packets if the next header isn't the
* last header.
*/
phdr->caplen = ((guint32) strlen (ascii_buf))/2;
/* Make sure we have enough room for the packet. */
ws_buffer_assure_space (buf, ISERIES_MAX_PACKET_LEN);
/* Convert ascii data to binary and return in the frame buffer */
iseries_parse_hex_string (ascii_buf, ws_buffer_start_ptr (buf), strlen (ascii_buf));
/* free buffer allocs and return */
*err = 0;
g_free (ascii_buf);
return TRUE;
errxit:
g_free (ascii_buf);
return FALSE;
}
/*
* Simple routine to convert an UNICODE buffer to ASCII
*
* XXX - This may be possible with iconv or similar
*/
static int
iseries_UNICODE_to_ASCII (guint8 * buf, guint bytes)
{
guint i;
guint8 *bufptr;
bufptr = buf;
for (i = 0; i < bytes; i++)
{
switch (buf[i])
{
case 0xFE:
case 0xFF:
case 0x00:
break;
default:
*bufptr = buf[i];
bufptr++;
}
if (buf[i] == 0x0A)
return i;
}
return i;
}
/*
* Simple routine to convert an ASCII hex string to binary data
* Requires ASCII hex data and buffer to populate with binary data
*/
static gboolean
iseries_parse_hex_string (const char * ascii, guint8 * buf, size_t len)
{
size_t i;
int byte;
gint hexvalue;
guint8 bytevalue;
byte = 0;
for (i = 0; i < len; i++)
{
hexvalue = g_ascii_xdigit_value(ascii[i]);
i++;
if (hexvalue == -1)
return FALSE; /* not a valid hex digit */
bytevalue = (guint8)(hexvalue << 4);
if (i >= len)
return FALSE; /* only one hex digit of the byte is present */
hexvalue = g_ascii_xdigit_value(ascii[i]);
if (hexvalue == -1)
return FALSE; /* not a valid hex digit */
bytevalue |= (guint8) hexvalue;
buf[byte] = bytevalue;
byte++;
}
return TRUE;
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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