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/*
* 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);
dump_parser_state();
return 0;
}
static void parse_line_device(parse_state*, int nargs, char** args) {
set_device_permission(nargs, args);
}
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