forked from osmocom/wireshark
![Maksim Salau](/assets/img/avatar_default.png)
It's preferable to parse text files and generate packets on demand, rather than generate a temporary PCAP file and dump all available packets into it. Parsing on the fly has a benefit of handling damaged files up to the point of damage, while the approach with a temporary file doesn't allow either to report that the original file is damaged or perform conversion in the first place. This version works faster than the previous one. Command: time ./run/tshark -r ./candump-2019-07-01_111120.log.gz > /dev/null The test file is attached to the bug 15889 The current version: real 0m0,597s user 0m0,533s sys 0m0,118s The previous version: real 0m2,176s user 0m1,966s sys 0m0,100s Bug: 15889 Change-Id: I862ce47752531c2e9d9459f5d865c1fc08f32fea Reviewed-on: https://code.wireshark.org/review/34007 Petri-Dish: Anders Broman <a.broman58@gmail.com> Tested-by: Petri Dish Buildbot Reviewed-by: Anders Broman <a.broman58@gmail.com>
352 lines
7.4 KiB
Text
352 lines
7.4 KiB
Text
%include {
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/* candump_parser.lemon
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* Support for candump log file format
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* Copyright (c) 2019 by Maksim Salau <maksim.salau@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include <assert.h>
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#include <string.h>
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#include <wiretap/file_wrappers.h>
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#include "candump_priv.h"
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extern void *CandumpParserAlloc(void *(*mallocProc)(size_t));
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extern void CandumpParser(void *yyp, int yymajor, token_t yyminor, candump_state_t *state);
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extern void CandumpParserFree(void *p, void (*freeProc)(void*));
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#ifdef CANDUMP_DEBUG
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extern void CandumpParserTrace(FILE *TraceFILE, char *zTracePrompt);
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#endif
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static void merge_msg_data(msg_data_t *dst, const msg_data_t *a, const msg_data_t *b)
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{
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dst->length = a->length + b->length;
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memcpy(&dst->data[0], &a->data[0], a->length);
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memcpy(&dst->data[a->length], &b->data[0], b->length);
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}
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DIAG_OFF(unreachable-code)
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}
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%name CandumpParser
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%token_prefix TOKEN_
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%token_type { token_t }
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%token_destructor
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{
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(void)state;
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(void)yypParser;
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(void)yypminor;
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}
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%extra_argument { candump_state_t* state }
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%syntax_error
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{
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(void)yypParser;
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(void)yyminor;
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#ifdef CANDUMP_DEBUG
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const int n = sizeof(yyTokenName) / sizeof(yyTokenName[0]);
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ws_debug_printf("%s: got token: %s\n", G_STRFUNC, yyTokenName[yymajor]);
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for (int i = 0; i < n; ++i) {
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int a = yy_find_shift_action((YYCODETYPE)i, yypParser->yytos->stateno);
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if (a < YYNSTATE + YYNRULE) {
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ws_debug_printf("%s: possible token: %s\n", G_STRFUNC, yyTokenName[i]);
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}
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}
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#endif
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g_free(state->parse_error);
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state->parse_error = g_strdup_printf("Syntax Error");
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#ifdef CANDUMP_DEBUG
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ws_debug_printf("%s: Syntax Error\n", G_STRFUNC);
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#endif
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}
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%parse_failure
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{
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g_free(state->parse_error);
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state->parse_error = g_strdup("Parse Error");
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#ifdef CANDUMP_DEBUG
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ws_debug_printf("%s: Parse Error\n", G_STRFUNC);
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#endif
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}
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%type msg { msg_t }
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%type timestamp { nstime_t }
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%type id { guint32 }
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%type flags { guint8 }
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%type byte { guint8 }
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%type data_max_8 { msg_data_t }
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%type data_max_64 { msg_data_t }
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%type data0 { msg_data_t }
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%type data1 { msg_data_t }
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%type data2 { msg_data_t }
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%type data3 { msg_data_t }
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%type data4 { msg_data_t }
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%type data5 { msg_data_t }
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%type data6 { msg_data_t }
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%type data7 { msg_data_t }
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%type data8 { msg_data_t }
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%type data12 { msg_data_t }
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%type data16 { msg_data_t }
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%type data20 { msg_data_t }
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%type data24 { msg_data_t }
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%type data32 { msg_data_t }
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%type data48 { msg_data_t }
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%type data64 { msg_data_t }
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%start_symbol line
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line ::= maybe_spaces msg(M) .
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{
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#ifdef CANDUMP_DEBUG
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ws_debug_printf("%s: read message\n", G_STRFUNC);
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#endif
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state->msg = M;
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state->is_msg_valid = TRUE;
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}
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line ::= maybe_spaces .
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{
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#ifdef CANDUMP_DEBUG
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ws_debug_printf("%s: read empty line\n", G_STRFUNC);
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#endif
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}
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maybe_spaces ::= maybe_spaces SPACE .
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maybe_spaces ::= .
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msg(M) ::= timestamp(T) SPACE ifname SPACE id(I) RTR(R) .
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{
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M.ts = T;
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M.is_fd = FALSE;
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M.id = I | CAN_RTR_FLAG;
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M.data.length = (guint8)R.v0;
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memset(M.data.data, 0, sizeof(M.data.data));
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}
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msg(M) ::= timestamp(T) SPACE ifname SPACE id(I) data_max_8(D) .
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{
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M.ts = T;
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M.is_fd = FALSE;
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M.id = I;
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M.data = D;
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}
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msg(M) ::= timestamp(T) SPACE ifname SPACE id(I) flags(F) data_max_64(D) .
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{
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M.ts = T;
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M.is_fd = TRUE;
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M.id = I;
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M.flags = F;
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M.data = D;
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}
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timestamp(R) ::= TIMESTAMP(A) .
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{
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R.secs = (time_t)A.v0;
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R.nsecs = (int)A.v1 * 1000;
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}
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ifname ::= ifname any .
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ifname ::= any .
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any ::= UNKNOWN .
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any ::= RTR .
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any ::= STD_ID .
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any ::= EXT_ID .
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any ::= FLAGS .
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any ::= TIMESTAMP .
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any ::= BYTE .
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id(R) ::= STD_ID(A) .
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{
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R = (guint32)A.v0;
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}
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id(R) ::= EXT_ID(A) .
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{
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R = (guint32)A.v0;
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if (!(R & CAN_ERR_FLAG))
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R |= CAN_EFF_FLAG;
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}
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flags(R) ::= FLAGS(A) .
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{
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R = (guint8)A.v0;
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}
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data_max_8 ::= data0 .
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data_max_8 ::= data1 .
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data_max_8 ::= data2 .
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data_max_8 ::= data3 .
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data_max_8 ::= data4 .
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data_max_8 ::= data5 .
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data_max_8 ::= data6 .
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data_max_8 ::= data7 .
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data_max_8 ::= data8 .
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data_max_64 ::= data_max_8 .
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data_max_64 ::= data12 .
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data_max_64 ::= data16 .
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data_max_64 ::= data20 .
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data_max_64 ::= data24 .
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data_max_64 ::= data32 .
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data_max_64 ::= data48 .
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data_max_64 ::= data64 .
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byte(R) ::= BYTE(A) .
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{
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R = (guint8)A.v0;
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}
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data0(R) ::= .
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{
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R.length = 0;
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}
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data1(R) ::= byte(A) .
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{
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R.length = 1;
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R.data[0] = A;
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}
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data2(R) ::= byte(A) byte(B) .
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{
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R.length = 2;
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R.data[0] = A;
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R.data[1] = B;
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}
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data3(R) ::= byte(A) byte(B) byte(C) .
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{
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R.length = 3;
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R.data[0] = A;
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R.data[1] = B;
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R.data[2] = C;
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}
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data4(R) ::= byte(A) byte(B) byte(C) byte(D) .
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{
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R.length = 4;
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R.data[0] = A;
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R.data[1] = B;
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R.data[2] = C;
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R.data[3] = D;
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}
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data5(R) ::= data4(A) data1(B) . { merge_msg_data(&R, &A, &B); }
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data6(R) ::= data4(A) data2(B) . { merge_msg_data(&R, &A, &B); }
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data7(R) ::= data4(A) data3(B) . { merge_msg_data(&R, &A, &B); }
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data8(R) ::= data4(A) data4(B) . { merge_msg_data(&R, &A, &B); }
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data12(R) ::= data8(A) data4(B) . { merge_msg_data(&R, &A, &B); }
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data16(R) ::= data8(A) data8(B) . { merge_msg_data(&R, &A, &B); }
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data20(R) ::= data16(A) data4(B) . { merge_msg_data(&R, &A, &B); }
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data24(R) ::= data16(A) data8(B) . { merge_msg_data(&R, &A, &B); }
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data32(R) ::= data16(A) data16(B) . { merge_msg_data(&R, &A, &B); }
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data48(R) ::= data32(A) data16(B) . { merge_msg_data(&R, &A, &B); }
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data64(R) ::= data32(A) data32(B) . { merge_msg_data(&R, &A, &B); }
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%code {
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DIAG_ON(unreachable-code)
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#include "candump_scanner_lex.h"
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#include "candump_parser.h"
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gboolean
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run_candump_parser(candump_state_t *state, int *err, gchar **err_info)
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{
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int lex_code;
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yyscan_t scanner;
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void *parser;
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state->err = 0;
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state->err_info = NULL;
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state->parse_error = NULL;
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if (candump_lex_init_extra(state, &scanner) != 0)
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{
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*err = errno;
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*err_info = g_strdup(g_strerror(errno));
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return FALSE;
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}
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parser = CandumpParserAlloc(g_malloc);
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#ifdef CANDUMP_DEBUG
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CandumpParserTrace(stdout, "parser >> ");
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ws_debug_printf("%s: Starting parsing\n", G_STRFUNC);
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#endif
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do
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{
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lex_code = candump_lex(scanner);
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#ifdef CANDUMP_DEBUG
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if (lex_code)
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ws_debug_printf("%s: Feeding %s '%s'\n",
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G_STRFUNC, yyTokenName[lex_code],
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candump_get_text(scanner));
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else
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ws_debug_printf("%s: Feeding %s\n",
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G_STRFUNC, yyTokenName[lex_code]);
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#endif
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CandumpParser(parser, lex_code, state->token, state);
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if (state->err || state->err_info || state->parse_error)
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break;
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}
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while (lex_code);
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#ifdef CANDUMP_DEBUG
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ws_debug_printf("%s: Done (%d)\n", G_STRFUNC, lex_code);
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#endif
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CandumpParserFree(parser, g_free);
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candump_lex_destroy(scanner);
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if (state->err || state->err_info || state->parse_error)
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{
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if (state->err_info)
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{
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*err_info = state->err_info;
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g_free(state->parse_error);
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}
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else
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{
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*err_info = state->parse_error;
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}
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if (state->err)
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*err = state->err;
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else
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*err = WTAP_ERR_BAD_FILE;
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return FALSE;
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}
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return TRUE;
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}
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}
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