499 lines
14 KiB
C++
499 lines
14 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "action.h"
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#include "init.h"
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#include "init_parser.h"
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#include "log.h"
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#include "parser.h"
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#include "property_service.h"
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#include "service.h"
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#include "util.h"
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#include <base/stringprintf.h>
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#include <cutils/iosched_policy.h>
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#include <cutils/list.h>
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static list_declare(service_list);
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struct import {
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struct listnode list;
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const char *filename;
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};
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static void *parse_service(struct parse_state *state, int nargs, char **args);
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static void parse_line_service(struct parse_state *state, int nargs, char **args);
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static void *parse_action(struct parse_state *state, int nargs, char **args);
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static void parse_line_action(struct parse_state *state, int nargs, char **args);
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#define SECTION 0x01
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#define COMMAND 0x02
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#define OPTION 0x04
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#include "keywords.h"
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#define KEYWORD(symbol, flags, nargs, func) \
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[ K_##symbol ] = { #symbol, func, nargs + 1, flags, },
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static struct {
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const char *name;
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int (*func)(const std::vector<std::string>& args);
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size_t nargs;
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unsigned char flags;
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} keyword_info[KEYWORD_COUNT] = {
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[ K_UNKNOWN ] = { "unknown", 0, 0, 0 },
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#include "keywords.h"
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};
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#undef KEYWORD
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#define kw_is(kw, type) (keyword_info[kw].flags & (type))
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#define kw_name(kw) (keyword_info[kw].name)
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#define kw_func(kw) (keyword_info[kw].func)
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#define kw_nargs(kw) (keyword_info[kw].nargs)
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void dump_parser_state() {
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ServiceManager::GetInstance().DumpState();
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ActionManager::GetInstance().DumpState();
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}
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static int lookup_keyword(const char *s)
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{
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switch (*s++) {
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case 'b':
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if (!strcmp(s, "ootchart_init")) return K_bootchart_init;
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break;
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case 'c':
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if (!strcmp(s, "opy")) return K_copy;
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if (!strcmp(s, "lass")) return K_class;
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if (!strcmp(s, "lass_start")) return K_class_start;
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if (!strcmp(s, "lass_stop")) return K_class_stop;
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if (!strcmp(s, "lass_reset")) return K_class_reset;
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if (!strcmp(s, "onsole")) return K_console;
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if (!strcmp(s, "hown")) return K_chown;
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if (!strcmp(s, "hmod")) return K_chmod;
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if (!strcmp(s, "ritical")) return K_critical;
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break;
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case 'd':
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if (!strcmp(s, "isabled")) return K_disabled;
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if (!strcmp(s, "omainname")) return K_domainname;
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break;
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case 'e':
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if (!strcmp(s, "nable")) return K_enable;
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if (!strcmp(s, "xec")) return K_exec;
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if (!strcmp(s, "xport")) return K_export;
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break;
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case 'g':
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if (!strcmp(s, "roup")) return K_group;
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break;
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case 'h':
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if (!strcmp(s, "ostname")) return K_hostname;
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break;
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case 'i':
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if (!strcmp(s, "oprio")) return K_ioprio;
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if (!strcmp(s, "fup")) return K_ifup;
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if (!strcmp(s, "nsmod")) return K_insmod;
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if (!strcmp(s, "mport")) return K_import;
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if (!strcmp(s, "nstallkey")) return K_installkey;
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break;
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case 'k':
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if (!strcmp(s, "eycodes")) return K_keycodes;
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break;
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case 'l':
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if (!strcmp(s, "oglevel")) return K_loglevel;
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if (!strcmp(s, "oad_persist_props")) return K_load_persist_props;
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if (!strcmp(s, "oad_all_props")) return K_load_all_props;
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break;
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case 'm':
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if (!strcmp(s, "kdir")) return K_mkdir;
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if (!strcmp(s, "ount_all")) return K_mount_all;
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if (!strcmp(s, "ount")) return K_mount;
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break;
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case 'o':
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if (!strcmp(s, "n")) return K_on;
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if (!strcmp(s, "neshot")) return K_oneshot;
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if (!strcmp(s, "nrestart")) return K_onrestart;
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break;
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case 'p':
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if (!strcmp(s, "owerctl")) return K_powerctl;
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break;
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case 'r':
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if (!strcmp(s, "estart")) return K_restart;
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if (!strcmp(s, "estorecon")) return K_restorecon;
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if (!strcmp(s, "estorecon_recursive")) return K_restorecon_recursive;
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if (!strcmp(s, "mdir")) return K_rmdir;
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if (!strcmp(s, "m")) return K_rm;
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break;
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case 's':
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if (!strcmp(s, "eclabel")) return K_seclabel;
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if (!strcmp(s, "ervice")) return K_service;
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if (!strcmp(s, "etenv")) return K_setenv;
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if (!strcmp(s, "etprop")) return K_setprop;
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if (!strcmp(s, "etrlimit")) return K_setrlimit;
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if (!strcmp(s, "ocket")) return K_socket;
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if (!strcmp(s, "tart")) return K_start;
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if (!strcmp(s, "top")) return K_stop;
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if (!strcmp(s, "wapon_all")) return K_swapon_all;
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if (!strcmp(s, "ymlink")) return K_symlink;
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if (!strcmp(s, "ysclktz")) return K_sysclktz;
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break;
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case 't':
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if (!strcmp(s, "rigger")) return K_trigger;
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break;
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case 'u':
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if (!strcmp(s, "ser")) return K_user;
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break;
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case 'v':
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if (!strcmp(s, "erity_load_state")) return K_verity_load_state;
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if (!strcmp(s, "erity_update_state")) return K_verity_update_state;
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break;
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case 'w':
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if (!strcmp(s, "rite")) return K_write;
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if (!strcmp(s, "ritepid")) return K_writepid;
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if (!strcmp(s, "ait")) return K_wait;
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break;
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}
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return K_UNKNOWN;
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}
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static void parse_line_no_op(struct parse_state*, int, char**) {
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}
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int expand_props(const std::string& src, std::string* dst) {
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const char *src_ptr = src.c_str();
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if (!dst) {
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return -1;
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}
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/* - variables can either be $x.y or ${x.y}, in case they are only part
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* of the string.
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* - will accept $$ as a literal $.
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* - no nested property expansion, i.e. ${foo.${bar}} is not supported,
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* bad things will happen
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*/
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while (*src_ptr) {
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const char *c;
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c = strchr(src_ptr, '$');
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if (!c) {
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dst->append(src_ptr);
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break;
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}
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dst->append(src_ptr, c);
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c++;
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if (*c == '$') {
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dst->push_back(*(c++));
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src_ptr = c;
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continue;
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} else if (*c == '\0') {
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break;
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}
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std::string prop_name;
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if (*c == '{') {
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c++;
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const char* end = strchr(c, '}');
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if (!end) {
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// failed to find closing brace, abort.
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ERROR("unexpected end of string in '%s', looking for }\n", src.c_str());
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goto err;
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}
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prop_name = std::string(c, end);
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c = end + 1;
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} else {
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prop_name = c;
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ERROR("using deprecated syntax for specifying property '%s', use ${name} instead\n",
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c);
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c += prop_name.size();
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}
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if (prop_name.empty()) {
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ERROR("invalid zero-length prop name in '%s'\n", src.c_str());
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goto err;
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}
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std::string prop_val = property_get(prop_name.c_str());
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if (prop_val.empty()) {
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ERROR("property '%s' doesn't exist while expanding '%s'\n",
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prop_name.c_str(), src.c_str());
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goto err;
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}
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dst->append(prop_val);
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src_ptr = c;
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continue;
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}
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return 0;
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err:
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return -1;
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}
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static void parse_import(struct parse_state *state, int nargs, char **args)
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{
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if (nargs != 2) {
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ERROR("single argument needed for import\n");
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return;
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}
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std::string conf_file;
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int ret = expand_props(args[1], &conf_file);
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if (ret) {
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ERROR("error while handling import on line '%d' in '%s'\n",
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state->line, state->filename);
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return;
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}
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struct import* import = (struct import*) calloc(1, sizeof(struct import));
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import->filename = strdup(conf_file.c_str());
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struct listnode *import_list = (listnode*) state->priv;
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list_add_tail(import_list, &import->list);
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INFO("Added '%s' to import list\n", import->filename);
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}
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static void parse_new_section(struct parse_state *state, int kw,
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int nargs, char **args)
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{
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printf("[ %s %s ]\n", args[0],
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nargs > 1 ? args[1] : "");
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switch(kw) {
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case K_service:
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state->context = parse_service(state, nargs, args);
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if (state->context) {
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state->parse_line = parse_line_service;
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return;
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}
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break;
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case K_on:
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state->context = parse_action(state, nargs, args);
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if (state->context) {
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state->parse_line = parse_line_action;
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return;
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}
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break;
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case K_import:
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parse_import(state, nargs, args);
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break;
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}
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state->parse_line = parse_line_no_op;
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}
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static void parse_config(const char *fn, const std::string& data)
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{
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struct listnode import_list;
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struct listnode *node;
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char *args[INIT_PARSER_MAXARGS];
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int nargs = 0;
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//TODO: Use a parser with const input and remove this copy
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std::vector<char> data_copy(data.begin(), data.end());
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data_copy.push_back('\0');
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parse_state state;
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state.filename = fn;
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state.line = 0;
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state.ptr = &data_copy[0];
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state.nexttoken = 0;
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state.parse_line = parse_line_no_op;
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list_init(&import_list);
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state.priv = &import_list;
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for (;;) {
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switch (next_token(&state)) {
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case T_EOF:
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state.parse_line(&state, 0, 0);
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goto parser_done;
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case T_NEWLINE:
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state.line++;
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if (nargs) {
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int kw = lookup_keyword(args[0]);
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if (kw_is(kw, SECTION)) {
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state.parse_line(&state, 0, 0);
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parse_new_section(&state, kw, nargs, args);
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} else {
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state.parse_line(&state, nargs, args);
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}
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nargs = 0;
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}
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break;
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case T_TEXT:
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if (nargs < INIT_PARSER_MAXARGS) {
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args[nargs++] = state.text;
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}
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break;
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}
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}
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parser_done:
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list_for_each(node, &import_list) {
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struct import* import = node_to_item(node, struct import, list);
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if (!init_parse_config(import->filename)) {
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ERROR("could not import file '%s' from '%s': %s\n",
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import->filename, fn, strerror(errno));
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}
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}
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}
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static bool init_parse_config_file(const char* path) {
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INFO("Parsing file %s...\n", path);
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Timer t;
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std::string data;
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if (!read_file(path, &data)) {
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return false;
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}
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data.push_back('\n'); // TODO: fix parse_config.
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parse_config(path, data);
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dump_parser_state();
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NOTICE("(Parsing %s took %.2fs.)\n", path, t.duration());
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return true;
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}
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static bool init_parse_config_dir(const char* path) {
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INFO("Parsing directory %s...\n", path);
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std::unique_ptr<DIR, int(*)(DIR*)> config_dir(opendir(path), closedir);
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if (!config_dir) {
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ERROR("Could not import directory '%s'\n", path);
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return false;
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}
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dirent* current_file;
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while ((current_file = readdir(config_dir.get()))) {
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std::string current_path =
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android::base::StringPrintf("%s/%s", path, current_file->d_name);
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// Ignore directories and only process regular files.
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if (current_file->d_type == DT_REG) {
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if (!init_parse_config_file(current_path.c_str())) {
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ERROR("could not import file '%s'\n", current_path.c_str());
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}
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}
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}
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return true;
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}
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bool init_parse_config(const char* path) {
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if (is_dir(path)) {
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return init_parse_config_dir(path);
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}
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return init_parse_config_file(path);
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}
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static void *parse_service(struct parse_state *state, int nargs, char **args)
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{
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if (nargs < 3) {
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parse_error(state, "services must have a name and a program\n");
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return nullptr;
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}
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std::vector<std::string> str_args(args + 2, args + nargs);
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std::string ret_err;
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Service* svc = ServiceManager::GetInstance().AddNewService(args[1], "default",
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str_args, &ret_err);
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if (!svc) {
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parse_error(state, "%s\n", ret_err.c_str());
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}
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return svc;
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}
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static void parse_line_service(struct parse_state *state, int nargs, char **args)
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{
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if (nargs == 0) {
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return;
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}
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Service* svc = static_cast<Service*>(state->context);
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int kw = lookup_keyword(args[0]);
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std::vector<std::string> str_args(args, args + nargs);
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std::string ret_err;
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bool ret = svc->HandleLine(kw, str_args, &ret_err);
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if (!ret) {
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parse_error(state, "%s\n", ret_err.c_str());
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}
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}
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static void *parse_action(struct parse_state* state, int nargs, char **args)
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{
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std::string ret_err;
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std::vector<std::string> triggers(args + 1, args + nargs);
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Action* ret = ActionManager::GetInstance().AddNewAction(triggers, &ret_err);
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if (!ret) {
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parse_error(state, "%s\n", ret_err.c_str());
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}
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return ret;
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}
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bool add_command_to_action(Action* action, const std::vector<std::string>& args,
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const std::string& filename, int line, std::string* err)
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{
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int kw;
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size_t n;
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kw = lookup_keyword(args[0].c_str());
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if (!kw_is(kw, COMMAND)) {
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*err = android::base::StringPrintf("invalid command '%s'\n", args[0].c_str());
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return false;
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}
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n = kw_nargs(kw);
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if (args.size() < n) {
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*err = android::base::StringPrintf("%s requires %zu %s\n",
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args[0].c_str(), n - 1,
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n > 2 ? "arguments" : "argument");
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return false;
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}
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action->AddCommand(kw_func(kw), args, filename, line);
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return true;
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}
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static void parse_line_action(struct parse_state* state, int nargs, char **args)
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{
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if (nargs == 0) {
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return;
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}
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Action* action = static_cast<Action*>(state->context);
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std::vector<std::string> str_args(args, args + nargs);
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std::string ret_err;
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bool ret = add_command_to_action(action, str_args, state->filename,
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state->line, &ret_err);
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if (!ret) {
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parse_error(state, "%s\n", ret_err.c_str());
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}
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}
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