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wireshark/wiretap/k12text.l

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/*
* We don't use input, so don't generate code for it.
*/
%option noinput
/*
* We don't use unput, so don't generate code for it.
*/
%option nounput
/*
* We don't read from the terminal.
*/
%option never-interactive
/*
* Prefix scanner routines with "K12Text_" rather than "yy", so this scanner
* can coexist with other scanners.
*/
%option prefix="K12Text_"
%option outfile="k12text.c"
/* Options useful for debugging */
/* noline: Prevent generation of #line directives */
/* Seems to be required when using the */
/* Windows VS debugger so as to be able */
/* to properly step through the code and */
/* set breakpoints & etc using the */
/* k12text.c file rather than the */
/* k12text.l file */
/* XXX: %option noline gives an error message: */
/* "unrecognized %option: line" */
/* with flex 2.5.35; the --noline */
/* command-line option works OK. */
/* */
/* debug: Do output of "rule acceptance" info */
/* during parse */
/* */
/* %option noline */
/* %option debug */
%{
/* k12text.l
*
* Wiretap Library
* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
*
* 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.
*/
/*
* TODO:
* - fix timestamps after midnight
* - verify encapsulations
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include "wtap-int.h"
#include "wtap.h"
#include "file_wrappers.h"
#include <wsutil/buffer.h>
#include "k12.h"
#include "k12text_lex.h"
#ifndef HAVE_UNISTD_H
#define YY_NO_UNISTD_H
#endif
static guint g_h;
static guint g_m;
static guint g_s;
static guint g_ms;
static guint g_ns;
static gint g_encap;
static guint8 bb[WTAP_MAX_PACKET_SIZE];
static guint ii;
static gboolean is_k12text;
static gboolean at_eof;
static guint junk_chars;
static void finalize_frame(void);
static gchar* error_str;
static guint64 file_bytes_read;
static gboolean ok_frame;
static FILE_T yy_fh;
#define KERROR(text) do { error_str = g_strdup(text); yyterminate(); } while(0)
#define SET_HOURS(text) g_h = (guint) strtoul(text,NULL,10)
#define SET_MINUTES(text) g_m = (guint) strtoul(text,NULL,10)
#define SET_SECONDS(text) g_s = (guint) strtoul(text,NULL,10)
#define SET_MS(text) g_ms = (guint) strtoul(text,NULL,10)
#define SET_NS(text) g_ns = (guint) strtoul(text,NULL,10)
#define ADD_BYTE(text) do {if (ii >= WTAP_MAX_PACKET_SIZE) {KERROR("frame too large");} bb[ii++] = (guint8)strtoul(text,NULL,16); } while(0)
#define FINALIZE_FRAME() finalize_frame()
/*~ #define ECHO*/
#define YY_USER_ACTION file_bytes_read += yyleng;
#define YY_INPUT(buf,result,max_size) { int c = file_getc(yy_fh); result = (c==EOF) ? YY_NULL : (buf[0] = c, 1); }
#define MAX_JUNK 400000
#define ECHO
/*
* Private per-file data.
*/
typedef struct {
/*
* The file position after the end of the previous frame processed by
* k12text_read.
*
* We need to keep this around, and seek to it at the beginning of
* each call to k12text_read(), since the lexer undoubtedly did some
* amount of look-ahead when processing the previous frame.
*/
gint64 next_frame_offset;
} k12text_t;
%}
start_timestamp \053[\055]{9}\053[\055]{15,100}\053[\055]{10,100}\053
oneormoredigits [0-9]+:
twodigits [0-9][0-9]
colon :
comma ,
threedigits [0-9][0-9][0-9]
start_bytes \174\060\040\040\040\174
bytes_junk \174[A-F0-9][A-F0-9\040][A-F0-9\040][A-F0-9\040]\174
byte [a-f0-9][a-f0-9]\174
end_bytes \015?\012\015?\012
eth ETHER
mtp2 MTP-L2
sscop SSCOP
sscfnni SSCF
hdlc HDLC
%START MAGIC NEXT_FRAME HOURS MINUTES M2S SECONDS S2M MS M2N NS ENCAP STARTBYTES BYTE
%%
<MAGIC>{start_timestamp} { is_k12text = TRUE; yyterminate(); }
<MAGIC>. { if (++ junk_chars > MAX_JUNK) { is_k12text = FALSE; yyterminate(); } }
<NEXT_FRAME>{start_timestamp} {BEGIN(HOURS); }
<HOURS>{oneormoredigits} { SET_HOURS(yytext); BEGIN(MINUTES); }
<MINUTES>{twodigits} { SET_MINUTES(yytext); BEGIN(M2S);}
<M2S>{colon} { BEGIN(SECONDS);}
<SECONDS>{twodigits} { SET_SECONDS(yytext); BEGIN(S2M); }
<S2M>{comma} { BEGIN(MS); }
<MS>{threedigits} { SET_MS(yytext); BEGIN(M2N); }
<M2N>{comma} { BEGIN(NS); }
<NS>{threedigits} { SET_NS(yytext); BEGIN(ENCAP);}
<ENCAP>{eth} {g_encap = WTAP_ENCAP_ETHERNET; BEGIN(STARTBYTES); }
<ENCAP>{mtp2} {g_encap = WTAP_ENCAP_MTP2; BEGIN(STARTBYTES); }
<ENCAP>{sscop} {g_encap = WTAP_ENCAP_ATM_PDUS; BEGIN(STARTBYTES); }
<ENCAP>{sscfnni} {g_encap = WTAP_ENCAP_MTP3; BEGIN(STARTBYTES); }
<ENCAP>{hdlc} {g_encap = WTAP_ENCAP_CHDLC; BEGIN(STARTBYTES); }
<ENCAP,STARTBYTES>{start_bytes} { fprintf(stderr, "OUCH: %s\b", yytext); BEGIN(BYTE); }
<BYTE>{byte} { ADD_BYTE(yytext); }
<BYTE>{bytes_junk} ;
<BYTE>{end_bytes} { FINALIZE_FRAME(); yyterminate(); }
. { if (++junk_chars > MAX_JUNK) { KERROR("too much junk"); } }
<<EOF>> { at_eof = TRUE; yyterminate(); }
%%
static void finalize_frame(void) {
ok_frame = TRUE;
}
/* Fill in pkthdr */
static gboolean
k12text_set_headers(struct wtap_pkthdr *phdr, int *err, gchar **err_info)
{
phdr->rec_type = REC_TYPE_PACKET;
phdr->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
phdr->ts.secs = 946681200 + (3600*g_h) + (60*g_m) + g_s;
phdr->ts.nsecs = 1000000*g_ms + 1000*g_ns;
phdr->caplen = phdr->len = ii;
phdr->pkt_encap = g_encap;
/* The file-encap is WTAP_ENCAP_PER_PACKET */
switch(g_encap) {
case WTAP_ENCAP_ETHERNET:
phdr->pseudo_header.eth.fcs_len = 0;
break;
case WTAP_ENCAP_MTP3:
case WTAP_ENCAP_CHDLC:
/* no pseudo_header to fill in for these types */
break;
case WTAP_ENCAP_MTP2: /* not (yet) supported */
/* XXX: I don't know how to fill in the */
/* pseudo_header for these types. */
*err = WTAP_ERR_UNSUPPORTED;
*err_info = g_strdup("k12text: MTP2 packets not yet supported");
return FALSE;
case WTAP_ENCAP_ATM_PDUS: /* not (yet) supported */
/* XXX: I don't know how to fill in the */
/* pseudo_header for these types. */
*err = WTAP_ERR_UNSUPPORTED;
*err_info = g_strdup("k12text: SSCOP packets not yet supported");
return FALSE;
default:
*err = WTAP_ERR_UNSUPPORTED;
*err_info = g_strdup("k12text: unknown encapsulation type");
return FALSE;
}
return TRUE;
}
/* Note: k12text_reset is called each time data is to be processed from */
/* a file. This ensures that no "state" from a previous read is */
/* used (such as the lexer look-ahead buffer, file_handle, file */
/* position and so on. This allows a single lexer buffer to be */
/* used even when multiple files are open simultaneously (as for */
/* a file merge). */
static void
k12text_reset(FILE_T fh)
{
yy_fh = fh;
yyrestart(0);
g_encap = WTAP_ENCAP_UNKNOWN;
ok_frame = FALSE;
is_k12text = FALSE;
at_eof = FALSE;
junk_chars = 0;
error_str = NULL;
file_bytes_read=0;
g_h=0;
g_m=0;
g_s=0;
g_ns=0;
g_ms=0;
ii=0;
}
static gboolean
k12text_read(wtap *wth, int *err, char ** err_info, gint64 *data_offset)
{
k12text_t *k12text = (k12text_t *)wth->priv;
/*
* We seek to the file position after the end of the previous frame
* processed by k12text_read(), since the lexer undoubtedly did some
* amount of look-ahead when processing the previous frame.
*
* We also clear out any lexer state (eg: look-ahead buffer) and
* init vars set by lexer.
*/
if ( file_seek(wth->fh, k12text->next_frame_offset, SEEK_SET, err) == -1) {
return FALSE;
}
k12text_reset(wth->fh); /* init lexer buffer and vars set by lexer */
BEGIN(NEXT_FRAME);
yylex();
if (ok_frame == FALSE) {
if (at_eof) {
*err = 0;
*err_info = NULL;
} else {
*err = WTAP_ERR_BAD_FILE;
*err_info = error_str;
}
return FALSE;
}
*data_offset = k12text->next_frame_offset; /* file position for beginning of this frame */
k12text->next_frame_offset += file_bytes_read; /* file position after end of this frame */
if (!k12text_set_headers(&wth->phdr, err, err_info))
return FALSE;
ws_buffer_assure_space(wth->frame_buffer, wth->phdr.caplen);
memcpy(ws_buffer_start_ptr(wth->frame_buffer), bb, wth->phdr.caplen);
return TRUE;
}
static gboolean
k12text_seek_read(wtap *wth, gint64 seek_off, struct wtap_pkthdr *phdr, Buffer *buf, int *err, char **err_info)
{
if ( file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1) {
return FALSE;
}
k12text_reset(wth->random_fh); /* init lexer buffer and vars set by lexer */
BEGIN(NEXT_FRAME);
yylex();
if (ok_frame == FALSE) {
*err = WTAP_ERR_BAD_FILE;
if (at_eof) {
/* What happened ? The desired frame was previously read without a problem */
*err_info = g_strdup("Unexpected EOF (program error ?)");
} else {
*err_info = error_str;
}
return FALSE;
}
if (!k12text_set_headers(phdr, err, err_info))
return FALSE;
ws_buffer_assure_space(buf, phdr->caplen);
memcpy(ws_buffer_start_ptr(buf), bb, phdr->caplen);
return TRUE;
}
wtap_open_return_val
k12text_open(wtap *wth, int *err, gchar **err_info _U_)
{
k12text_t *k12text;
k12text_reset(wth->fh); /* init lexer buffer and vars set by lexer */
BEGIN(MAGIC);
yylex();
if (! is_k12text) return WTAP_OPEN_NOT_MINE;
if ( file_seek(wth->fh, 0, SEEK_SET, err) == -1) {
return WTAP_OPEN_ERROR;
}
k12text = (k12text_t *)g_malloc(sizeof(k12text_t));
wth->priv = (void *)k12text;
k12text->next_frame_offset = 0;
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_K12TEXT;
wth->file_encap = WTAP_ENCAP_PER_PACKET;
wth->snapshot_length = 0;
wth->subtype_read = k12text_read;
wth->subtype_seek_read = k12text_seek_read;
wth->file_tsprec = WTAP_TSPREC_NSEC;
return WTAP_OPEN_MINE;
}
static const struct { int e; const char* s; } encaps[] = {
{ WTAP_ENCAP_ETHERNET, "ETHER" },
{ WTAP_ENCAP_MTP2, "MTP-L2" },
{ WTAP_ENCAP_ATM_PDUS, "SSCOP" },
{ WTAP_ENCAP_MTP3, "SSCF" },
{ WTAP_ENCAP_CHDLC, "HDLC" },
/* ... */
{ 0, NULL }
};
static gboolean
k12text_dump(wtap_dumper *wdh _U_, const struct wtap_pkthdr *phdr,
const guint8 *pd, int *err) {
#define K12BUF_SIZE 196808
char *buf;
size_t left = K12BUF_SIZE;
size_t wl;
char *p;
const char* str_enc;
guint i;
guint ns;
guint ms;
gboolean ret;
struct tm *tmp;
/* Don't write anything bigger than we're willing to read. */
if (phdr->caplen > WTAP_MAX_PACKET_SIZE) {
*err = WTAP_ERR_PACKET_TOO_LARGE;
return FALSE;
}
str_enc = NULL;
for(i=0; encaps[i].s; i++) {
if (phdr->pkt_encap == encaps[i].e) {
str_enc = encaps[i].s;
break;
}
}
if (str_enc == NULL) {
/*
* That encapsulation type is not supported. Fail.
*/
*err = WTAP_ERR_UNWRITABLE_ENCAP;
return FALSE;
}
buf = (char *)g_malloc(K12BUF_SIZE);
p = buf;
ms = phdr->ts.nsecs / 1000000;
ns = (phdr->ts.nsecs - (1000000*ms))/1000;
tmp = gmtime(&phdr->ts.secs);
if (tmp == NULL)
g_snprintf(p, 90, "+---------+---------------+----------+\r\nXX:XX:XX,");
else
strftime(p, 90, "+---------+---------------+----------+\r\n%H:%M:%S,", tmp);
wl = strlen(p);
p += wl;
left -= wl;
wl = g_snprintf(p, (gulong)left, "%.3d,%.3d %s\r\n|0 |", ms, ns, str_enc);
p += wl;
left -= wl;
for(i = 0; i < phdr->caplen && left > 2; i++) {
wl = g_snprintf(p, (gulong)left, "%.2x|", pd[i]);
p += wl;
left -= wl;
}
wl = g_snprintf(p, (gulong)left, "\r\n\r\n");
left -= wl;
ret = wtap_dump_file_write(wdh, buf, K12BUF_SIZE - left, err);
g_free(buf);
return ret;
}
gboolean
k12text_dump_open(wtap_dumper *wdh, int *err _U_)
{
wdh->subtype_write = k12text_dump;
return TRUE;
}
int
k12text_dump_can_write_encap(int encap)
{
switch (encap) {
case WTAP_ENCAP_PER_PACKET:
case WTAP_ENCAP_ETHERNET:
case WTAP_ENCAP_MTP3:
case WTAP_ENCAP_CHDLC:
return 0;
case WTAP_ENCAP_MTP2:
case WTAP_ENCAP_ATM_PDUS:
default:
return WTAP_ERR_UNWRITABLE_ENCAP;
}
}
/*
* We want to stop processing when we get to the end of the input.
* (%option noyywrap is not used because if used then
* some flex versions (eg: 2.5.35) generate code which causes
* warnings by the Windows VC compiler).
*/
int yywrap(void) {
return 1;
}
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