forked from osmocom/wireshark
![Alexis La Goutte](/assets/img/avatar_default.png)
(Using sed : sed -i '/^ \* \$Id\$/,+1 d') Fix manually some typo (in export_object_dicom.c and crc16-plain.c) Change-Id: I4c1ae68d1c4afeace8cb195b53c715cf9e1227a8 Reviewed-on: https://code.wireshark.org/review/497 Reviewed-by: Anders Broman <a.broman58@gmail.com>
581 lines
14 KiB
C
581 lines
14 KiB
C
/*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 2001 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "dfilter-int.h"
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#include "gencode.h"
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#include "dfvm.h"
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#include "syntax-tree.h"
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#include "sttype-range.h"
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#include "sttype-test.h"
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#include "sttype-function.h"
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#include "ftypes/ftypes.h"
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static void
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gencode(dfwork_t *dfw, stnode_t *st_node);
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static int
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gen_entity(dfwork_t *dfw, stnode_t *st_arg, dfvm_value_t **p_jmp);
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static void
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dfw_append_insn(dfwork_t *dfw, dfvm_insn_t *insn)
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{
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insn->id = dfw->next_insn_id;
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dfw->next_insn_id++;
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g_ptr_array_add(dfw->insns, insn);
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}
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static void
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dfw_append_const(dfwork_t *dfw, dfvm_insn_t *insn)
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{
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insn->id = dfw->next_const_id;
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dfw->next_const_id++;
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g_ptr_array_add(dfw->consts, insn);
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}
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/* returns register number */
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static int
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dfw_append_read_tree(dfwork_t *dfw, header_field_info *hfinfo)
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{
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dfvm_insn_t *insn;
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dfvm_value_t *val1, *val2;
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int reg = -1;
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gboolean added_new_hfinfo = FALSE;
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/* Rewind to find the first field of this name. */
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while (hfinfo->same_name_prev_id != -1) {
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hfinfo = proto_registrar_get_nth(hfinfo->same_name_prev_id);
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}
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/* Keep track of which registers
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* were used for which hfinfo's so that we
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* can re-use registers. */
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reg = GPOINTER_TO_INT(
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g_hash_table_lookup(dfw->loaded_fields, hfinfo));
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if (reg) {
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/* Reg's are stored in has as reg+1, so
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* that the non-existence of a hfinfo in
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* the hash, or 0, can be differentiated from
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* a hfinfo being loaded into register #0. */
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reg--;
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}
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else {
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reg = dfw->next_register++;
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g_hash_table_insert(dfw->loaded_fields,
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hfinfo, GINT_TO_POINTER(reg + 1));
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added_new_hfinfo = TRUE;
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}
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insn = dfvm_insn_new(READ_TREE);
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val1 = dfvm_value_new(HFINFO);
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val1->value.hfinfo = hfinfo;
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val2 = dfvm_value_new(REGISTER);
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val2->value.numeric = reg;
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insn->arg1 = val1;
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insn->arg2 = val2;
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dfw_append_insn(dfw, insn);
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if (added_new_hfinfo) {
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while (hfinfo) {
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/* Record the FIELD_ID in hash of interesting fields. */
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g_hash_table_insert(dfw->interesting_fields,
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GINT_TO_POINTER(hfinfo->id),
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GUINT_TO_POINTER(TRUE));
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hfinfo = hfinfo->same_name_next;
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}
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}
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return reg;
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}
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/* returns register number */
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static int
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dfw_append_put_fvalue(dfwork_t *dfw, fvalue_t *fv)
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{
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dfvm_insn_t *insn;
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dfvm_value_t *val1, *val2;
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int reg;
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insn = dfvm_insn_new(PUT_FVALUE);
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val1 = dfvm_value_new(FVALUE);
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val1->value.fvalue = fv;
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val2 = dfvm_value_new(REGISTER);
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reg = dfw->first_constant--;
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val2->value.numeric = reg;
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insn->arg1 = val1;
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insn->arg2 = val2;
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dfw_append_const(dfw, insn);
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return reg;
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}
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/* returns register number */
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static int
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dfw_append_mk_range(dfwork_t *dfw, stnode_t *node, dfvm_value_t **p_jmp)
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{
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int hf_reg, reg;
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stnode_t *entity;
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dfvm_insn_t *insn;
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dfvm_value_t *val;
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entity = sttype_range_entity(node);
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/* XXX, check if p_jmp logic is OK */
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hf_reg = gen_entity(dfw, entity, p_jmp);
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insn = dfvm_insn_new(MK_RANGE);
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val = dfvm_value_new(REGISTER);
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val->value.numeric = hf_reg;
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insn->arg1 = val;
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val = dfvm_value_new(REGISTER);
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reg =dfw->next_register++;
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val->value.numeric = reg;
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insn->arg2 = val;
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val = dfvm_value_new(DRANGE);
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val->value.drange = sttype_range_drange(node);
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insn->arg3 = val;
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sttype_range_remove_drange(node);
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dfw_append_insn(dfw, insn);
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return reg;
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}
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/* returns register number that the functions's result will be in. */
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static int
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dfw_append_function(dfwork_t *dfw, stnode_t *node, dfvm_value_t **p_jmp)
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{
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GSList *params;
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int i, num_params, reg;
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dfvm_value_t **jmps;
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dfvm_insn_t *insn;
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dfvm_value_t *val1, *val2, *val;
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params = sttype_function_params(node);
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num_params = g_slist_length(params);
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/* Array to hold the instructions that need to jump to
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* an instruction if they fail. */
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jmps = (dfvm_value_t **)g_malloc(num_params * sizeof(dfvm_value_t*));
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/* Create the new DFVM instruction */
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insn = dfvm_insn_new(CALL_FUNCTION);
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val1 = dfvm_value_new(FUNCTION_DEF);
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val1->value.funcdef = sttype_function_funcdef(node);
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insn->arg1 = val1;
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val2 = dfvm_value_new(REGISTER);
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val2->value.numeric = dfw->next_register++;
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insn->arg2 = val2;
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insn->arg3 = NULL;
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insn->arg4 = NULL;
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i = 0;
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while (params) {
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jmps[i] = NULL;
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reg = gen_entity(dfw, (stnode_t *)params->data, &jmps[i]);
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val = dfvm_value_new(REGISTER);
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val->value.numeric = reg;
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switch(i) {
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case 0:
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insn->arg3 = val;
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break;
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case 1:
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insn->arg4 = val;
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break;
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default:
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g_assert_not_reached();
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}
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params = params->next;
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i++;
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}
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dfw_append_insn(dfw, insn);
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/* If any of our parameters failed, send them to
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* our own failure instruction. This *has* to be done
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* after we caled dfw_append_insn above so that
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* we know what the next DFVM insruction is, via
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* dfw->next_insn_id */
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for (i = 0; i < num_params; i++) {
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if (jmps[i]) {
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jmps[i]->value.numeric = dfw->next_insn_id;
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}
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}
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/* We need another instruction to jump to another exit
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* place, if the call() of our function failed for some reaosn */
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insn = dfvm_insn_new(IF_FALSE_GOTO);
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g_assert(p_jmp);
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*p_jmp = dfvm_value_new(INSN_NUMBER);
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insn->arg1 = *p_jmp;
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dfw_append_insn(dfw, insn);
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g_free(jmps);
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return val2->value.numeric;
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}
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static void
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gen_relation(dfwork_t *dfw, dfvm_opcode_t op, stnode_t *st_arg1, stnode_t *st_arg2)
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{
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dfvm_insn_t *insn;
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dfvm_value_t *val1, *val2;
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dfvm_value_t *jmp1 = NULL, *jmp2 = NULL;
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int reg1 = -1, reg2 = -1;
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/* Create code for the LHS and RHS of the relation */
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reg1 = gen_entity(dfw, st_arg1, &jmp1);
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reg2 = gen_entity(dfw, st_arg2, &jmp2);
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/* Then combine them in a DFVM insruction */
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insn = dfvm_insn_new(op);
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val1 = dfvm_value_new(REGISTER);
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val1->value.numeric = reg1;
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val2 = dfvm_value_new(REGISTER);
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val2->value.numeric = reg2;
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insn->arg1 = val1;
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insn->arg2 = val2;
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dfw_append_insn(dfw, insn);
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/* If either of the relation argumnents need an "exit" instruction
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* to jump to (on failure), mark them */
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if (jmp1) {
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jmp1->value.numeric = dfw->next_insn_id;
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}
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if (jmp2) {
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jmp2->value.numeric = dfw->next_insn_id;
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}
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}
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/* Parse an entity, returning the reg that it gets put into.
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* p_jmp will be set if it has to be set by the calling code; it should
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* be set to the place to jump to, to return to the calling code,
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* if the load of a field from the proto_tree fails. */
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static int
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gen_entity(dfwork_t *dfw, stnode_t *st_arg, dfvm_value_t **p_jmp)
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{
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sttype_id_t e_type;
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dfvm_insn_t *insn;
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header_field_info *hfinfo;
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int reg = -1;
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e_type = stnode_type_id(st_arg);
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if (e_type == STTYPE_FIELD) {
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hfinfo = (header_field_info*)stnode_data(st_arg);
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reg = dfw_append_read_tree(dfw, hfinfo);
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insn = dfvm_insn_new(IF_FALSE_GOTO);
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g_assert(p_jmp);
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*p_jmp = dfvm_value_new(INSN_NUMBER);
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insn->arg1 = *p_jmp;
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dfw_append_insn(dfw, insn);
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}
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else if (e_type == STTYPE_FVALUE) {
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reg = dfw_append_put_fvalue(dfw, (fvalue_t *)stnode_data(st_arg));
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}
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else if (e_type == STTYPE_RANGE) {
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reg = dfw_append_mk_range(dfw, st_arg, p_jmp);
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}
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else if (e_type == STTYPE_FUNCTION) {
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reg = dfw_append_function(dfw, st_arg, p_jmp);
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}
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else {
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printf("sttype_id is %u\n", e_type);
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g_assert_not_reached();
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}
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return reg;
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}
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static void
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gen_test(dfwork_t *dfw, stnode_t *st_node)
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{
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test_op_t st_op;
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stnode_t *st_arg1, *st_arg2;
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dfvm_value_t *val1;
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dfvm_insn_t *insn;
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header_field_info *hfinfo;
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sttype_test_get(st_node, &st_op, &st_arg1, &st_arg2);
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switch (st_op) {
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case TEST_OP_UNINITIALIZED:
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g_assert_not_reached();
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break;
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case TEST_OP_EXISTS:
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val1 = dfvm_value_new(HFINFO);
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hfinfo = (header_field_info*)stnode_data(st_arg1);
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/* Rewind to find the first field of this name. */
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while (hfinfo->same_name_prev_id != -1) {
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hfinfo = proto_registrar_get_nth(hfinfo->same_name_prev_id);
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}
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val1->value.hfinfo = hfinfo;
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insn = dfvm_insn_new(CHECK_EXISTS);
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insn->arg1 = val1;
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dfw_append_insn(dfw, insn);
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/* Record the FIELD_ID in hash of interesting fields. */
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while (hfinfo) {
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g_hash_table_insert(dfw->interesting_fields,
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GINT_TO_POINTER(hfinfo->id),
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GUINT_TO_POINTER(TRUE));
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hfinfo = hfinfo->same_name_next;
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}
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break;
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case TEST_OP_NOT:
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gencode(dfw, st_arg1);
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insn = dfvm_insn_new(NOT);
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dfw_append_insn(dfw, insn);
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break;
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case TEST_OP_AND:
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gencode(dfw, st_arg1);
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insn = dfvm_insn_new(IF_FALSE_GOTO);
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val1 = dfvm_value_new(INSN_NUMBER);
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insn->arg1 = val1;
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dfw_append_insn(dfw, insn);
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gencode(dfw, st_arg2);
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val1->value.numeric = dfw->next_insn_id;
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break;
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case TEST_OP_OR:
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gencode(dfw, st_arg1);
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insn = dfvm_insn_new(IF_TRUE_GOTO);
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val1 = dfvm_value_new(INSN_NUMBER);
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insn->arg1 = val1;
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dfw_append_insn(dfw, insn);
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gencode(dfw, st_arg2);
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val1->value.numeric = dfw->next_insn_id;
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break;
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case TEST_OP_EQ:
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gen_relation(dfw, ANY_EQ, st_arg1, st_arg2);
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break;
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case TEST_OP_NE:
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gen_relation(dfw, ANY_NE, st_arg1, st_arg2);
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break;
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case TEST_OP_GT:
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gen_relation(dfw, ANY_GT, st_arg1, st_arg2);
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break;
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case TEST_OP_GE:
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gen_relation(dfw, ANY_GE, st_arg1, st_arg2);
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break;
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case TEST_OP_LT:
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gen_relation(dfw, ANY_LT, st_arg1, st_arg2);
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break;
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case TEST_OP_LE:
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gen_relation(dfw, ANY_LE, st_arg1, st_arg2);
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break;
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case TEST_OP_BITWISE_AND:
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gen_relation(dfw, ANY_BITWISE_AND, st_arg1, st_arg2);
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break;
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case TEST_OP_CONTAINS:
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gen_relation(dfw, ANY_CONTAINS, st_arg1, st_arg2);
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break;
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case TEST_OP_MATCHES:
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gen_relation(dfw, ANY_MATCHES, st_arg1, st_arg2);
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break;
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}
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}
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static void
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gencode(dfwork_t *dfw, stnode_t *st_node)
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{
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/* const char *name; */
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/* name = */stnode_type_name(st_node); /* XXX: is this being done just for the side-effect ? */
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switch (stnode_type_id(st_node)) {
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case STTYPE_TEST:
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gen_test(dfw, st_node);
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break;
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default:
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g_assert_not_reached();
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}
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}
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void
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dfw_gencode(dfwork_t *dfw)
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{
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int id, id1, length;
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dfvm_insn_t *insn, *insn1, *prev;
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dfvm_value_t *arg1;
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dfw->insns = g_ptr_array_new();
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dfw->consts = g_ptr_array_new();
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dfw->loaded_fields = g_hash_table_new(g_direct_hash, g_direct_equal);
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dfw->interesting_fields = g_hash_table_new(g_direct_hash, g_direct_equal);
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gencode(dfw, dfw->st_root);
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dfw_append_insn(dfw, dfvm_insn_new(RETURN));
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/* fixup goto */
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length = dfw->insns->len;
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for (id = 0, prev = NULL; id < length; prev = insn, id++) {
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insn = (dfvm_insn_t *)g_ptr_array_index(dfw->insns, id);
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arg1 = insn->arg1;
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if (insn->op == IF_TRUE_GOTO || insn->op == IF_FALSE_GOTO) {
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dfvm_opcode_t revert = (insn->op == IF_FALSE_GOTO)?IF_TRUE_GOTO:IF_FALSE_GOTO;
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id1 = arg1->value.numeric;
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do {
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insn1 = (dfvm_insn_t*)g_ptr_array_index(dfw->insns, id1);
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if (insn1->op == revert) {
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/* this one is always false and the branch is not taken*/
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id1 = id1 +1;
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continue;
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}
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else if (insn1->op == READ_TREE && prev && prev->op == READ_TREE &&
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prev->arg2->value.numeric == insn1->arg2->value.numeric) {
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/* hack if it's the same register it's the same field
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* and it returns the same value
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*/
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id1 = id1 +1;
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continue;
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}
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else if (insn1->op != insn->op) {
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/* bail out */
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arg1 = insn->arg1;
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arg1->value.numeric = id1;
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break;
|
|
}
|
|
arg1 = insn1->arg1;
|
|
id1 = arg1->value.numeric;
|
|
} while (1);
|
|
}
|
|
}
|
|
|
|
/* move constants after registers*/
|
|
if (dfw->first_constant == -1) {
|
|
/* NONE */
|
|
dfw->first_constant = dfw->next_register;
|
|
return;
|
|
}
|
|
|
|
id = -dfw->first_constant -1;
|
|
dfw->first_constant = dfw->next_register;
|
|
dfw->next_register += id;
|
|
|
|
length = dfw->consts->len;
|
|
for (id = 0; id < length; id++) {
|
|
insn = (dfvm_insn_t *)g_ptr_array_index(dfw->consts, id);
|
|
if (insn->arg2 && insn->arg2->type == REGISTER && (int)insn->arg2->value.numeric < 0 )
|
|
insn->arg2->value.numeric = dfw->first_constant - insn->arg2->value.numeric -1;
|
|
}
|
|
|
|
length = dfw->insns->len;
|
|
for (id = 0; id < length; id++) {
|
|
insn = (dfvm_insn_t *)g_ptr_array_index(dfw->insns, id);
|
|
if (insn->arg1 && insn->arg1->type == REGISTER && (int)insn->arg1->value.numeric < 0 )
|
|
insn->arg1->value.numeric = dfw->first_constant - insn->arg1->value.numeric -1;
|
|
|
|
if (insn->arg2 && insn->arg2->type == REGISTER && (int)insn->arg2->value.numeric < 0 )
|
|
insn->arg2->value.numeric = dfw->first_constant - insn->arg2->value.numeric -1;
|
|
|
|
if (insn->arg3 && insn->arg3->type == REGISTER && (int)insn->arg3->value.numeric < 0 )
|
|
insn->arg3->value.numeric = dfw->first_constant - insn->arg3->value.numeric -1;
|
|
|
|
if (insn->arg4 && insn->arg4->type == REGISTER && (int)insn->arg4->value.numeric < 0 )
|
|
insn->arg4->value.numeric = dfw->first_constant - insn->arg4->value.numeric -1;
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
typedef struct {
|
|
int i;
|
|
int *fields;
|
|
} hash_key_iterator;
|
|
|
|
static void
|
|
get_hash_key(gpointer key, gpointer value _U_, gpointer user_data)
|
|
{
|
|
int field_id = GPOINTER_TO_INT(key);
|
|
hash_key_iterator *hki = (hash_key_iterator *)user_data;
|
|
|
|
hki->fields[hki->i] = field_id;
|
|
hki->i++;
|
|
}
|
|
|
|
int*
|
|
dfw_interesting_fields(dfwork_t *dfw, int *caller_num_fields)
|
|
{
|
|
int num_fields = g_hash_table_size(dfw->interesting_fields);
|
|
|
|
hash_key_iterator hki;
|
|
|
|
if (num_fields == 0) {
|
|
*caller_num_fields = 0;
|
|
return NULL;
|
|
}
|
|
|
|
hki.fields = g_new(int, num_fields);
|
|
hki.i = 0;
|
|
|
|
g_hash_table_foreach(dfw->interesting_fields, get_hash_key, &hki);
|
|
*caller_num_fields = num_fields;
|
|
return hki.fields;
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* tab-width: 8
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
*/
|