diff options
Diffstat (limited to 'init/init_parser.c')
| -rw-r--r-- | init/init_parser.c | 669 |
1 files changed, 669 insertions, 0 deletions
diff --git a/init/init_parser.c b/init/init_parser.c new file mode 100644 index 0000000..585a5b5 --- /dev/null +++ b/init/init_parser.c @@ -0,0 +1,669 @@ +/* + * 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 <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <fcntl.h> +#include <stdarg.h> +#include <string.h> +#include <stddef.h> +#include <ctype.h> + +#include "init.h" +#include "parser.h" +#include "init_parser.h" +#include "log.h" +#include "list.h" +#include "property_service.h" +#include "util.h" + +#include <cutils/iosched_policy.h> + +#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ +#include <sys/_system_properties.h> + +static list_declare(service_list); +static list_declare(action_list); +static list_declare(action_queue); + +static void *parse_service(struct parse_state *state, int nargs, char **args); +static void parse_line_service(struct parse_state *state, int nargs, char **args); + +static void *parse_action(struct parse_state *state, int nargs, char **args); +static void parse_line_action(struct parse_state *state, int nargs, char **args); + +#define SECTION 0x01 +#define COMMAND 0x02 +#define OPTION 0x04 + +#include "keywords.h" + +#define KEYWORD(symbol, flags, nargs, func) \ + [ K_##symbol ] = { #symbol, func, nargs + 1, flags, }, + +struct { + const char *name; + int (*func)(int nargs, char **args); + unsigned char nargs; + unsigned char flags; +} keyword_info[KEYWORD_COUNT] = { + [ K_UNKNOWN ] = { "unknown", 0, 0, 0 }, +#include "keywords.h" +}; +#undef KEYWORD + +#define kw_is(kw, type) (keyword_info[kw].flags & (type)) +#define kw_name(kw) (keyword_info[kw].name) +#define kw_func(kw) (keyword_info[kw].func) +#define kw_nargs(kw) (keyword_info[kw].nargs) + +int lookup_keyword(const char *s) +{ + switch (*s++) { + case 'c': + if (!strcmp(s, "opy")) return K_copy; + if (!strcmp(s, "apability")) return K_capability; + if (!strcmp(s, "hdir")) return K_chdir; + if (!strcmp(s, "hroot")) return K_chroot; + if (!strcmp(s, "lass")) return K_class; + if (!strcmp(s, "lass_start")) return K_class_start; + if (!strcmp(s, "lass_stop")) return K_class_stop; + if (!strcmp(s, "onsole")) return K_console; + if (!strcmp(s, "hown")) return K_chown; + if (!strcmp(s, "hmod")) return K_chmod; + if (!strcmp(s, "ritical")) return K_critical; + break; + case 'd': + if (!strcmp(s, "isabled")) return K_disabled; + if (!strcmp(s, "omainname")) return K_domainname; + break; + case 'e': + if (!strcmp(s, "xec")) return K_exec; + if (!strcmp(s, "xport")) return K_export; + break; + case 'g': + if (!strcmp(s, "roup")) return K_group; + break; + case 'h': + if (!strcmp(s, "ostname")) return K_hostname; + break; + case 'i': + if (!strcmp(s, "oprio")) return K_ioprio; + if (!strcmp(s, "fup")) return K_ifup; + if (!strcmp(s, "nsmod")) return K_insmod; + if (!strcmp(s, "mport")) return K_import; + break; + case 'k': + if (!strcmp(s, "eycodes")) return K_keycodes; + break; + case 'l': + if (!strcmp(s, "oglevel")) return K_loglevel; + break; + case 'm': + if (!strcmp(s, "kdir")) return K_mkdir; + if (!strcmp(s, "ount")) return K_mount; + break; + case 'o': + if (!strcmp(s, "n")) return K_on; + if (!strcmp(s, "neshot")) return K_oneshot; + if (!strcmp(s, "nrestart")) return K_onrestart; + break; + case 'r': + if (!strcmp(s, "estart")) return K_restart; + break; + case 's': + if (!strcmp(s, "ervice")) return K_service; + if (!strcmp(s, "etenv")) return K_setenv; + if (!strcmp(s, "etkey")) return K_setkey; + if (!strcmp(s, "etprop")) return K_setprop; + if (!strcmp(s, "etrlimit")) return K_setrlimit; + if (!strcmp(s, "ocket")) return K_socket; + if (!strcmp(s, "tart")) return K_start; + if (!strcmp(s, "top")) return K_stop; + if (!strcmp(s, "ymlink")) return K_symlink; + if (!strcmp(s, "ysclktz")) return K_sysclktz; + break; + case 't': + if (!strcmp(s, "rigger")) return K_trigger; + break; + case 'u': + if (!strcmp(s, "ser")) return K_user; + break; + case 'w': + if (!strcmp(s, "rite")) return K_write; + if (!strcmp(s, "ait")) return K_wait; + break; + } + return K_UNKNOWN; +} + +void parse_line_no_op(struct parse_state *state, int nargs, char **args) +{ +} + +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_service: + state->context = parse_service(state, nargs, args); + if (state->context) { + state->parse_line = parse_line_service; + return; + } + break; + case K_on: + state->context = parse_action(state, nargs, args); + if (state->context) { + state->parse_line = parse_line_action; + return; + } + break; + } + state->parse_line = parse_line_no_op; +} + +static void parse_config(const char *fn, char *s) +{ + struct parse_state state; + char *args[INIT_PARSER_MAXARGS]; + int nargs; + + nargs = 0; + state.filename = fn; + state.line = 1; + state.ptr = s; + state.nexttoken = 0; + state.parse_line = parse_line_no_op; + for (;;) { + switch (next_token(&state)) { + case T_EOF: + state.parse_line(&state, 0, 0); + return; + case T_NEWLINE: + if (nargs) { + int kw = lookup_keyword(args[0]); + if (kw_is(kw, SECTION)) { + state.parse_line(&state, 0, 0); + parse_new_section(&state, kw, nargs, args); + } else { + state.parse_line(&state, nargs, args); + } + nargs = 0; + } + break; + case T_TEXT: + if (nargs < INIT_PARSER_MAXARGS) { + args[nargs++] = state.text; + } + break; + } + } +} + +int init_parse_config_file(const char *fn) +{ + char *data; + data = read_file(fn, 0); + if (!data) return -1; + + parse_config(fn, data); + DUMP(); + return 0; +} + +static int valid_name(const char *name) +{ + if (strlen(name) > 16) { + return 0; + } + while (*name) { + if (!isalnum(*name) && (*name != '_') && (*name != '-')) { + return 0; + } + name++; + } + return 1; +} + +struct service *service_find_by_name(const char *name) +{ + struct listnode *node; + struct service *svc; + list_for_each(node, &service_list) { + svc = node_to_item(node, struct service, slist); + if (!strcmp(svc->name, name)) { + return svc; + } + } + return 0; +} + +struct service *service_find_by_pid(pid_t pid) +{ + struct listnode *node; + struct service *svc; + list_for_each(node, &service_list) { + svc = node_to_item(node, struct service, slist); + if (svc->pid == pid) { + return svc; + } + } + return 0; +} + +struct service *service_find_by_keychord(int keychord_id) +{ + struct listnode *node; + struct service *svc; + list_for_each(node, &service_list) { + svc = node_to_item(node, struct service, slist); + if (svc->keychord_id == keychord_id) { + return svc; + } + } + return 0; +} + +void service_for_each(void (*func)(struct service *svc)) +{ + struct listnode *node; + struct service *svc; + list_for_each(node, &service_list) { + svc = node_to_item(node, struct service, slist); + func(svc); + } +} + +void service_for_each_class(const char *classname, + void (*func)(struct service *svc)) +{ + struct listnode *node; + struct service *svc; + list_for_each(node, &service_list) { + svc = node_to_item(node, struct service, slist); + if (!strcmp(svc->classname, classname)) { + func(svc); + } + } +} + +void service_for_each_flags(unsigned matchflags, + void (*func)(struct service *svc)) +{ + struct listnode *node; + struct service *svc; + list_for_each(node, &service_list) { + svc = node_to_item(node, struct service, slist); + if (svc->flags & matchflags) { + func(svc); + } + } +} + +void action_for_each_trigger(const char *trigger, + void (*func)(struct action *act)) +{ + struct listnode *node; + struct action *act; + list_for_each(node, &action_list) { + act = node_to_item(node, struct action, alist); + if (!strcmp(act->name, trigger)) { + func(act); + } + } +} + +void queue_property_triggers(const char *name, const char *value) +{ + struct listnode *node; + struct action *act; + list_for_each(node, &action_list) { + act = node_to_item(node, struct action, alist); + if (!strncmp(act->name, "property:", strlen("property:"))) { + const char *test = act->name + strlen("property:"); + int name_length = strlen(name); + + if (!strncmp(name, test, name_length) && + test[name_length] == '=' && + !strcmp(test + name_length + 1, value)) { + action_add_queue_tail(act); + } + } + } +} + +void queue_all_property_triggers() +{ + struct listnode *node; + struct action *act; + list_for_each(node, &action_list) { + act = node_to_item(node, struct action, alist); + if (!strncmp(act->name, "property:", strlen("property:"))) { + /* parse property name and value + syntax is property:<name>=<value> */ + const char* name = act->name + strlen("property:"); + const char* equals = strchr(name, '='); + if (equals) { + char prop_name[PROP_NAME_MAX + 1]; + const char* value; + int length = equals - name; + if (length > PROP_NAME_MAX) { + ERROR("property name too long in trigger %s", act->name); + } else { + memcpy(prop_name, name, length); + prop_name[length] = 0; + + /* does the property exist, and match the trigger value? */ + value = property_get(prop_name); + if (value && !strcmp(equals + 1, value)) { + action_add_queue_tail(act); + } + } + } + } + } +} + +void queue_builtin_action(int (*func)(int nargs, char **args), char *name) +{ + struct action *act; + struct command *cmd; + + act = calloc(1, sizeof(*act)); + act->name = name; + list_init(&act->commands); + + cmd = calloc(1, sizeof(*cmd)); + cmd->func = func; + cmd->args[0] = name; + list_add_tail(&act->commands, &cmd->clist); + + list_add_tail(&action_list, &act->alist); + action_add_queue_tail(act); +} + +void action_add_queue_tail(struct action *act) +{ + list_add_tail(&action_queue, &act->qlist); +} + +struct action *action_remove_queue_head(void) +{ + if (list_empty(&action_queue)) { + return 0; + } else { + struct listnode *node = list_head(&action_queue); + struct action *act = node_to_item(node, struct action, qlist); + list_remove(node); + return act; + } +} + +int action_queue_empty() +{ + return list_empty(&action_queue); +} + +static void *parse_service(struct parse_state *state, int nargs, char **args) +{ + struct service *svc; + if (nargs < 3) { + parse_error(state, "services must have a name and a program\n"); + return 0; + } + if (!valid_name(args[1])) { + parse_error(state, "invalid service name '%s'\n", args[1]); + return 0; + } + + svc = service_find_by_name(args[1]); + if (svc) { + parse_error(state, "ignored duplicate definition of service '%s'\n", args[1]); + return 0; + } + + nargs -= 2; + svc = calloc(1, sizeof(*svc) + sizeof(char*) * nargs); + if (!svc) { + parse_error(state, "out of memory\n"); + return 0; + } + svc->name = args[1]; + svc->classname = "default"; + memcpy(svc->args, args + 2, sizeof(char*) * nargs); + svc->args[nargs] = 0; + svc->nargs = nargs; + svc->onrestart.name = "onrestart"; + list_init(&svc->onrestart.commands); + list_add_tail(&service_list, &svc->slist); + return svc; +} + +static void parse_line_service(struct parse_state *state, int nargs, char **args) +{ + struct service *svc = state->context; + struct command *cmd; + int i, kw, kw_nargs; + + if (nargs == 0) { + return; + } + + svc->ioprio_class = IoSchedClass_NONE; + + kw = lookup_keyword(args[0]); + switch (kw) { + case K_capability: + break; + case K_class: + if (nargs != 2) { + parse_error(state, "class option requires a classname\n"); + } else { + svc->classname = args[1]; + } + break; + case K_console: + svc->flags |= SVC_CONSOLE; + break; + case K_disabled: + svc->flags |= SVC_DISABLED; + break; + case K_ioprio: + if (nargs != 3) { + parse_error(state, "ioprio optin usage: ioprio <rt|be|idle> <ioprio 0-7>\n"); + } else { + svc->ioprio_pri = strtoul(args[2], 0, 8); + + if (svc->ioprio_pri < 0 || svc->ioprio_pri > 7) { + parse_error(state, "priority value must be range 0 - 7\n"); + break; + } + + if (!strcmp(args[1], "rt")) { + svc->ioprio_class = IoSchedClass_RT; + } else if (!strcmp(args[1], "be")) { + svc->ioprio_class = IoSchedClass_BE; + } else if (!strcmp(args[1], "idle")) { + svc->ioprio_class = IoSchedClass_IDLE; + } else { + parse_error(state, "ioprio option usage: ioprio <rt|be|idle> <0-7>\n"); + } + } + break; + case K_group: + if (nargs < 2) { + parse_error(state, "group option requires a group id\n"); + } else if (nargs > NR_SVC_SUPP_GIDS + 2) { + parse_error(state, "group option accepts at most %d supp. groups\n", + NR_SVC_SUPP_GIDS); + } else { + int n; + svc->gid = decode_uid(args[1]); + for (n = 2; n < nargs; n++) { + svc->supp_gids[n-2] = decode_uid(args[n]); + } + svc->nr_supp_gids = n - 2; + } + break; + case K_keycodes: + if (nargs < 2) { + parse_error(state, "keycodes option requires atleast one keycode\n"); + } else { + svc->keycodes = malloc((nargs - 1) * sizeof(svc->keycodes[0])); + if (!svc->keycodes) { + parse_error(state, "could not allocate keycodes\n"); + } else { + svc->nkeycodes = nargs - 1; + for (i = 1; i < nargs; i++) { + svc->keycodes[i - 1] = atoi(args[i]); + } + } + } + break; + case K_oneshot: + svc->flags |= SVC_ONESHOT; + break; + case K_onrestart: + nargs--; + args++; + kw = lookup_keyword(args[0]); + if (!kw_is(kw, COMMAND)) { + parse_error(state, "invalid command '%s'\n", args[0]); + break; + } + 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"); + break; + } + + cmd = malloc(sizeof(*cmd) + sizeof(char*) * nargs); + cmd->func = kw_func(kw); + cmd->nargs = nargs; + memcpy(cmd->args, args, sizeof(char*) * nargs); + list_add_tail(&svc->onrestart.commands, &cmd->clist); + break; + case K_critical: + svc->flags |= SVC_CRITICAL; + break; + case K_setenv: { /* name value */ + struct svcenvinfo *ei; + if (nargs < 2) { + parse_error(state, "setenv option requires name and value arguments\n"); + break; + } + ei = calloc(1, sizeof(*ei)); + if (!ei) { + parse_error(state, "out of memory\n"); + break; + } + ei->name = args[1]; + ei->value = args[2]; + ei->next = svc->envvars; + svc->envvars = ei; + break; + } + case K_socket: {/* name type perm [ uid gid ] */ + struct socketinfo *si; + if (nargs < 4) { + parse_error(state, "socket option requires name, type, perm arguments\n"); + break; + } + if (strcmp(args[2],"dgram") && strcmp(args[2],"stream")) { + parse_error(state, "socket type must be 'dgram' or 'stream'\n"); + break; + } + si = calloc(1, sizeof(*si)); + if (!si) { + parse_error(state, "out of memory\n"); + break; + } + si->name = args[1]; + si->type = args[2]; + si->perm = strtoul(args[3], 0, 8); + if (nargs > 4) + si->uid = decode_uid(args[4]); + if (nargs > 5) + si->gid = decode_uid(args[5]); + si->next = svc->sockets; + svc->sockets = si; + break; + } + case K_user: + if (nargs != 2) { + parse_error(state, "user option requires a user id\n"); + } else { + svc->uid = decode_uid(args[1]); + } + break; + default: + parse_error(state, "invalid option '%s'\n", args[0]); + } +} + +static void *parse_action(struct parse_state *state, int nargs, char **args) +{ + struct action *act; + if (nargs < 2) { + parse_error(state, "actions must have a trigger\n"); + return 0; + } + if (nargs > 2) { + parse_error(state, "actions may not have extra parameters\n"); + return 0; + } + act = calloc(1, sizeof(*act)); + act->name = args[1]; + list_init(&act->commands); + list_add_tail(&action_list, &act->alist); + /* XXX add to hash */ + return act; +} + +static void parse_line_action(struct parse_state* state, int nargs, char **args) +{ + struct command *cmd; + struct action *act = state->context; + int (*func)(int nargs, char **args); + int kw, n; + + if (nargs == 0) { + return; + } + + kw = lookup_keyword(args[0]); + if (!kw_is(kw, COMMAND)) { + parse_error(state, "invalid command '%s'\n", args[0]); + return; + } + + n = kw_nargs(kw); + if (nargs < n) { + parse_error(state, "%s requires %d %s\n", args[0], n - 1, + n > 2 ? "arguments" : "argument"); + return; + } + cmd = malloc(sizeof(*cmd) + sizeof(char*) * nargs); + cmd->func = kw_func(kw); + cmd->nargs = nargs; + memcpy(cmd->args, args, sizeof(char*) * nargs); + list_add_tail(&act->commands, &cmd->clist); +} |