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
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "ueventd.h"
#include "ueventd_parser.h"
#include "parser.h"
#include "log.h"
#include "util.h"
static list_declare(subsystem_list);
static void parse_line_device(struct parse_state *state, int nargs, char **args);
#define SECTION 0x01
#define OPTION 0x02
#include "ueventd_keywords.h"
#define KEYWORD(symbol, flags, nargs) \
[ K_##symbol ] = { #symbol, nargs + 1, flags, },
static struct {
const char *name;
unsigned char nargs;
unsigned char flags;
} keyword_info[KEYWORD_COUNT] = {
[ K_UNKNOWN ] = { "unknown", 0, 0 },
#include "ueventd_keywords.h"
};
#undef KEYWORD
#define kw_is(kw, type) (keyword_info[kw].flags & (type))
#define kw_nargs(kw) (keyword_info[kw].nargs)
static int lookup_keyword(const char *s)
{
switch (*s++) {
case 'd':
if (!strcmp(s, "evname")) return K_devname;
if (!strcmp(s, "irname")) return K_dirname;
break;
case 's':
if (!strcmp(s, "ubsystem")) return K_subsystem;
break;
}
return K_UNKNOWN;
}
static void parse_line_no_op(struct parse_state*, int, char**) {
}
static int valid_name(const char *name)
{
while (*name) {
if (!isalnum(*name) && (*name != '_') && (*name != '-')) {
return 0;
}
name++;
}
return 1;
}
struct ueventd_subsystem *ueventd_subsystem_find_by_name(const char *name)
{
struct listnode *node;
struct ueventd_subsystem *s;
list_for_each(node, &subsystem_list) {
s = node_to_item(node, struct ueventd_subsystem, slist);
if (!strcmp(s->name, name)) {
return s;
}
}
return 0;
}
static void *parse_subsystem(parse_state* state, int /*nargs*/, char** args) {
if (!valid_name(args[1])) {
parse_error(state, "invalid subsystem name '%s'\n", args[1]);
return 0;
}
ueventd_subsystem* s = ueventd_subsystem_find_by_name(args[1]);
if (s) {
parse_error(state, "ignored duplicate definition of subsystem '%s'\n",
args[1]);
return 0;
}
s = (ueventd_subsystem*) calloc(1, sizeof(*s));
if (!s) {
parse_error(state, "out of memory\n");
return 0;
}
s->name = args[1];
s->dirname = "/dev";
list_add_tail(&subsystem_list, &s->slist);
return s;
}
static void parse_line_subsystem(struct parse_state *state, int nargs,
char **args)
{
struct ueventd_subsystem *s = (ueventd_subsystem*) state->context;
int kw;
if (nargs == 0) {
return;
}
kw = lookup_keyword(args[0]);
switch (kw) {
case K_devname:
if (!strcmp(args[1], "uevent_devname"))
s->devname_src = DEVNAME_UEVENT_DEVNAME;
else if (!strcmp(args[1], "uevent_devpath"))
s->devname_src = DEVNAME_UEVENT_DEVPATH;
else
parse_error(state, "invalid devname '%s'\n", args[1]);
break;
case K_dirname:
if (args[1][0] == '/')
s->dirname = args[1];
else
parse_error(state, "dirname '%s' does not start with '/'\n",
args[1]);
break;
default:
parse_error(state, "invalid option '%s'\n", args[0]);
}
}
static void parse_new_section(struct parse_state *state, int kw,
int nargs, char **args)
{
printf("[ %s %s ]\n", args[0],
nargs > 1 ? args[1] : "");
switch(kw) {
case K_subsystem:
state->context = parse_subsystem(state, nargs, args);
if (state->context) {
state->parse_line = parse_line_subsystem;
return;
}
break;
}
state->parse_line = parse_line_no_op;
}
static void parse_line(struct parse_state *state, char **args, int nargs)
{
int kw = lookup_keyword(args[0]);
int kw_nargs = kw_nargs(kw);
if (nargs < kw_nargs) {
parse_error(state, "%s requires %d %s\n", args[0], kw_nargs - 1,
kw_nargs > 2 ? "arguments" : "argument");
return;
}
if (kw_is(kw, SECTION)) {
parse_new_section(state, kw, nargs, args);
} else if (kw_is(kw, OPTION)) {
state->parse_line(state, nargs, args);
} else {
parse_line_device(state, nargs, args);
}
}
static void parse_config(const char *fn, const std::string& data)
{
char *args[UEVENTD_PARSER_MAXARGS];
int nargs = 0;
parse_state state;
state.filename = fn;
state.line = 1;
state.ptr = strdup(data.c_str()); // TODO: fix this code!
state.nexttoken = 0;
state.parse_line = parse_line_no_op;
for (;;) {
int token = next_token(&state);
switch (token) {
case T_EOF:
parse_line(&state, args, nargs);
return;
case T_NEWLINE:
if (nargs) {
parse_line(&state, args, nargs);
nargs = 0;
}
state.line++;
break;
case T_TEXT:
if (nargs < UEVENTD_PARSER_MAXARGS) {
args[nargs++] = state.text;
}
break;
}
}
}
int ueventd_parse_config_file(const char *fn)
{
std::string data;
if (!read_file(fn, &data)) {
return -1;
}
data.push_back('\n'); // TODO: fix parse_config.
parse_config(fn, data);
return 0;
}
static void parse_line_device(parse_state*, int nargs, char** args) {
set_device_permission(nargs, args);
}
|
