1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
%error-verbose
%{
/*
* phpdbg_parser.y
* (from php-src root)
* flex sapi/phpdbg/dev/phpdbg_lexer.l
* bison sapi/phpdbg/dev/phpdbg_parser.y
*/
#include "phpdbg.h"
#include "phpdbg_cmd.h"
#include "phpdbg_utils.h"
#define YYSTYPE phpdbg_param_t
#include "phpdbg_parser.h"
#include "phpdbg_lexer.h"
ZEND_EXTERN_MODULE_GLOBALS(phpdbg);
int yyerror(phpdbg_param_t *stack, yyscan_t scanner, const char *msg) {
phpdbg_error("Parse Error: %s", msg);
}
void phpdbg_debug_param(const phpdbg_param_t *param, const char *msg) {
if (param && param->type) {
switch (param->type) {
case STR_PARAM:
fprintf(stderr, "%s STR_PARAM(%s=%d)\n", msg, param->str, param->len);
break;
case ADDR_PARAM:
fprintf(stderr, "%s ADDR_PARAM(%lu)\n", msg, param->addr);
break;
case FILE_PARAM:
fprintf(stderr, "%s FILE_PARAM(%s:%d)\n", msg, param->file.name, param->file.line);
break;
case METHOD_PARAM:
fprintf(stderr, "%s METHOD_PARAM(%s::%s)\n", msg, param->method.class, param->method.name);
break;
case NUMERIC_PARAM:
fprintf(stderr, "%s NUMERIC_PARAM(%ld)\n", msg, param->num);
break;
}
}
}
void phpdbg_stack_free(phpdbg_param_t *stack) {
if (stack && stack->next) {
phpdbg_param_t *remove = stack->next;
while (remove) {
phpdbg_param_t *next = NULL;
if (remove->next)
next = remove->next;
switch (remove->type) {
case STR_PARAM:
if (remove->str) {
free(remove->str);
}
break;
case FILE_PARAM:
if (remove->file.name) {
free(remove->file.name);
}
break;
}
free(remove);
if (next)
remove = next;
else break;
}
}
}
static void phpdbg_stack_push(phpdbg_param_t *stack, phpdbg_param_t *param) {
phpdbg_param_t *next = calloc(1, sizeof(phpdbg_param_t));
if (!next)
return;
*(next) = *(param);
if (stack->top == NULL) {
stack->top = next;
stack->next = next;
} else {
stack->top->next = next;
next->top = stack->top;
stack->top = next;
}
stack->len++;
}
int phpdbg_stack_execute(phpdbg_param_t *stack, char **why) {
phpdbg_param_t *command = NULL,
*params = NULL;
if (stack->type != STACK_PARAM) {
asprintf(
why, "the passed argument was not a stack !!");
return FAILURE;
}
if (!stack->len) {
asprintf(
why, "the stack contains nothing !!");
return FAILURE;
}
command = params = (phpdbg_param_t*) stack->next;
if (command->type != STR_PARAM) {
asprintf(
why, "the first parameter is expected to be a string !!");
return FAILURE;
}
/* do resolve command(s) */
/* do prepare params for function */
while (params) {
phpdbg_debug_param(params, "-> ...");
params = params->next;
}
return SUCCESS;
}
%}
%code requires {
#include "phpdbg.h"
#ifndef YY_TYPEDEF_YY_SCANNER_T
#define YY_TYPEDEF_YY_SCANNER_T
typedef void* yyscan_t;
#endif
}
%expect 1
%output "sapi/phpdbg/phpdbg_parser.c"
%defines "sapi/phpdbg/phpdbg_parser.h"
%define api.pure
%lex-param { yyscan_t scanner }
%parse-param { phpdbg_param_t *stack }
%parse-param { yyscan_t scanner }
%token C_TRUTHY "truthy (true, on, yes or enabled)"
%token C_FALSY "falsy (false, off, no or disabled)"
%token C_STRING "string (some input, perhaps)"
%token C_EVAL "eval"
%token C_SHELL "shell"
%token T_DIGITS "digits (numbers)"
%token T_LITERAL "literal (string)"
%token T_METHOD "method"
%token T_OPLINE "opline"
%token T_FILE "file"
%token T_ID "identifier (command or function name)"
%token T_INPUT "input (input string or data)"
%token T_UNEXPECTED "input"
%%
input
: handler
;
parameters
: parameter { phpdbg_stack_push(stack, &$1); }
| parameters parameter { phpdbg_stack_push(stack, &$2); }
;
params
: /* empty */
| parameters
;
normal
: T_ID { phpdbg_stack_push(stack, &$1); }
| normal T_ID { phpdbg_stack_push(stack, &$2); }
;
special
: C_EVAL T_INPUT { phpdbg_stack_push(stack, &$1); phpdbg_stack_push(stack, &$2); }
| C_SHELL T_INPUT { phpdbg_stack_push(stack, &$1); phpdbg_stack_push(stack, &$2); }
;
command
: normal
| special
;
parameter
: T_DIGITS { $$ = $1; }
| T_FILE { $$ = $1; }
| T_METHOD { $$ = $1; }
| T_OPLINE { $$ = $1; }
| T_ID { $$ = $1; }
| T_LITERAL { $$ = $1; }
| C_TRUTHY { $$ = $1; }
| C_FALSY { $$ = $1; }
;
handler
: command params
;
%%
|
