Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 17 | #include <ctype.h> |
| 18 | #include <errno.h> |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 19 | #include <stdio.h> |
| 20 | #include <unistd.h> |
| 21 | #include <stdarg.h> |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 22 | #include <stdlib.h> |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 23 | #include <string.h> |
| 24 | |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 25 | #include "ueventd.h" |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 26 | #include "ueventd_parser.h" |
| 27 | #include "parser.h" |
| 28 | #include "log.h" |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 29 | #include "util.h" |
| 30 | |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 31 | static list_declare(subsystem_list); |
| 32 | |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 33 | static void parse_line_device(struct parse_state *state, int nargs, char **args); |
| 34 | |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 35 | #define SECTION 0x01 |
| 36 | #define OPTION 0x02 |
| 37 | |
| 38 | #include "ueventd_keywords.h" |
| 39 | |
| 40 | #define KEYWORD(symbol, flags, nargs) \ |
| 41 | [ K_##symbol ] = { #symbol, nargs + 1, flags, }, |
| 42 | |
| 43 | static struct { |
| 44 | const char *name; |
| 45 | unsigned char nargs; |
| 46 | unsigned char flags; |
| 47 | } keyword_info[KEYWORD_COUNT] = { |
| 48 | [ K_UNKNOWN ] = { "unknown", 0, 0 }, |
| 49 | #include "ueventd_keywords.h" |
| 50 | }; |
| 51 | #undef KEYWORD |
| 52 | |
| 53 | #define kw_is(kw, type) (keyword_info[kw].flags & (type)) |
| 54 | #define kw_nargs(kw) (keyword_info[kw].nargs) |
| 55 | |
| 56 | static int lookup_keyword(const char *s) |
| 57 | { |
| 58 | switch (*s++) { |
| 59 | case 'd': |
| 60 | if (!strcmp(s, "evname")) return K_devname; |
| 61 | if (!strcmp(s, "irname")) return K_dirname; |
| 62 | break; |
| 63 | case 's': |
| 64 | if (!strcmp(s, "ubsystem")) return K_subsystem; |
| 65 | break; |
| 66 | } |
| 67 | return K_UNKNOWN; |
| 68 | } |
| 69 | |
Elliott Hughes | f682b47 | 2015-02-06 12:19:48 -0800 | [diff] [blame] | 70 | static void parse_line_no_op(struct parse_state*, int, char**) { |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 71 | } |
| 72 | |
| 73 | static int valid_name(const char *name) |
| 74 | { |
| 75 | while (*name) { |
| 76 | if (!isalnum(*name) && (*name != '_') && (*name != '-')) { |
| 77 | return 0; |
| 78 | } |
| 79 | name++; |
| 80 | } |
| 81 | return 1; |
| 82 | } |
| 83 | |
| 84 | struct ueventd_subsystem *ueventd_subsystem_find_by_name(const char *name) |
| 85 | { |
| 86 | struct listnode *node; |
| 87 | struct ueventd_subsystem *s; |
| 88 | |
| 89 | list_for_each(node, &subsystem_list) { |
| 90 | s = node_to_item(node, struct ueventd_subsystem, slist); |
| 91 | if (!strcmp(s->name, name)) { |
| 92 | return s; |
| 93 | } |
| 94 | } |
| 95 | return 0; |
| 96 | } |
| 97 | |
Elliott Hughes | f682b47 | 2015-02-06 12:19:48 -0800 | [diff] [blame] | 98 | static void *parse_subsystem(parse_state* state, int /*nargs*/, char** args) { |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 99 | if (!valid_name(args[1])) { |
| 100 | parse_error(state, "invalid subsystem name '%s'\n", args[1]); |
| 101 | return 0; |
| 102 | } |
| 103 | |
Elliott Hughes | f3cf438 | 2015-02-03 17:12:07 -0800 | [diff] [blame] | 104 | ueventd_subsystem* s = ueventd_subsystem_find_by_name(args[1]); |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 105 | if (s) { |
| 106 | parse_error(state, "ignored duplicate definition of subsystem '%s'\n", |
| 107 | args[1]); |
| 108 | return 0; |
| 109 | } |
| 110 | |
Elliott Hughes | f3cf438 | 2015-02-03 17:12:07 -0800 | [diff] [blame] | 111 | s = (ueventd_subsystem*) calloc(1, sizeof(*s)); |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 112 | if (!s) { |
| 113 | parse_error(state, "out of memory\n"); |
| 114 | return 0; |
| 115 | } |
| 116 | s->name = args[1]; |
| 117 | s->dirname = "/dev"; |
| 118 | list_add_tail(&subsystem_list, &s->slist); |
| 119 | return s; |
| 120 | } |
| 121 | |
| 122 | static void parse_line_subsystem(struct parse_state *state, int nargs, |
| 123 | char **args) |
| 124 | { |
Elliott Hughes | f3cf438 | 2015-02-03 17:12:07 -0800 | [diff] [blame] | 125 | struct ueventd_subsystem *s = (ueventd_subsystem*) state->context; |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 126 | int kw; |
| 127 | |
| 128 | if (nargs == 0) { |
| 129 | return; |
| 130 | } |
| 131 | |
| 132 | kw = lookup_keyword(args[0]); |
| 133 | switch (kw) { |
| 134 | case K_devname: |
| 135 | if (!strcmp(args[1], "uevent_devname")) |
| 136 | s->devname_src = DEVNAME_UEVENT_DEVNAME; |
| 137 | else if (!strcmp(args[1], "uevent_devpath")) |
| 138 | s->devname_src = DEVNAME_UEVENT_DEVPATH; |
| 139 | else |
| 140 | parse_error(state, "invalid devname '%s'\n", args[1]); |
| 141 | break; |
| 142 | |
| 143 | case K_dirname: |
| 144 | if (args[1][0] == '/') |
| 145 | s->dirname = args[1]; |
| 146 | else |
| 147 | parse_error(state, "dirname '%s' does not start with '/'\n", |
| 148 | args[1]); |
| 149 | break; |
| 150 | |
| 151 | default: |
| 152 | parse_error(state, "invalid option '%s'\n", args[0]); |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | static void parse_new_section(struct parse_state *state, int kw, |
| 157 | int nargs, char **args) |
| 158 | { |
| 159 | printf("[ %s %s ]\n", args[0], |
| 160 | nargs > 1 ? args[1] : ""); |
| 161 | |
| 162 | switch(kw) { |
| 163 | case K_subsystem: |
| 164 | state->context = parse_subsystem(state, nargs, args); |
| 165 | if (state->context) { |
| 166 | state->parse_line = parse_line_subsystem; |
| 167 | return; |
| 168 | } |
| 169 | break; |
| 170 | } |
| 171 | state->parse_line = parse_line_no_op; |
| 172 | } |
| 173 | |
| 174 | static void parse_line(struct parse_state *state, char **args, int nargs) |
| 175 | { |
| 176 | int kw = lookup_keyword(args[0]); |
| 177 | int kw_nargs = kw_nargs(kw); |
| 178 | |
| 179 | if (nargs < kw_nargs) { |
| 180 | parse_error(state, "%s requires %d %s\n", args[0], kw_nargs - 1, |
| 181 | kw_nargs > 2 ? "arguments" : "argument"); |
| 182 | return; |
| 183 | } |
| 184 | |
| 185 | if (kw_is(kw, SECTION)) { |
| 186 | parse_new_section(state, kw, nargs, args); |
| 187 | } else if (kw_is(kw, OPTION)) { |
| 188 | state->parse_line(state, nargs, args); |
| 189 | } else { |
| 190 | parse_line_device(state, nargs, args); |
| 191 | } |
| 192 | } |
| 193 | |
Elliott Hughes | f682b47 | 2015-02-06 12:19:48 -0800 | [diff] [blame] | 194 | static void parse_config(const char *fn, const std::string& data) |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 195 | { |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 196 | char *args[UEVENTD_PARSER_MAXARGS]; |
Tom Cherry | eaa3b4e | 2015-05-12 13:54:41 -0700 | [diff] [blame^] | 197 | |
| 198 | int nargs = 0; |
| 199 | parse_state state; |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 200 | state.filename = fn; |
| 201 | state.line = 1; |
Elliott Hughes | f682b47 | 2015-02-06 12:19:48 -0800 | [diff] [blame] | 202 | state.ptr = strdup(data.c_str()); // TODO: fix this code! |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 203 | state.nexttoken = 0; |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 204 | state.parse_line = parse_line_no_op; |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 205 | for (;;) { |
| 206 | int token = next_token(&state); |
| 207 | switch (token) { |
| 208 | case T_EOF: |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 209 | parse_line(&state, args, nargs); |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 210 | return; |
| 211 | case T_NEWLINE: |
| 212 | if (nargs) { |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 213 | parse_line(&state, args, nargs); |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 214 | nargs = 0; |
| 215 | } |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 216 | state.line++; |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 217 | break; |
| 218 | case T_TEXT: |
| 219 | if (nargs < UEVENTD_PARSER_MAXARGS) { |
| 220 | args[nargs++] = state.text; |
| 221 | } |
| 222 | break; |
| 223 | } |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | int ueventd_parse_config_file(const char *fn) |
| 228 | { |
Elliott Hughes | f682b47 | 2015-02-06 12:19:48 -0800 | [diff] [blame] | 229 | std::string data; |
| 230 | if (!read_file(fn, &data)) { |
| 231 | return -1; |
| 232 | } |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 233 | |
Tom Cherry | eaa3b4e | 2015-05-12 13:54:41 -0700 | [diff] [blame^] | 234 | data.push_back('\n'); // TODO: fix parse_config. |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 235 | parse_config(fn, data); |
Elliott Hughes | c0e919c | 2015-02-04 14:46:36 -0800 | [diff] [blame] | 236 | dump_parser_state(); |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 237 | return 0; |
| 238 | } |
| 239 | |
Elliott Hughes | f682b47 | 2015-02-06 12:19:48 -0800 | [diff] [blame] | 240 | static void parse_line_device(parse_state*, int nargs, char** args) { |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 241 | set_device_permission(nargs, args); |
| 242 | } |