init_parser.c revision 50b3afd9f39619f69dc6f4efc29be88933eb3614 
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
17#include <stdio.h>
18#include <stdlib.h>
19#include <unistd.h>
20#include <fcntl.h>
21#include <stdarg.h>
22#include <string.h>
23#include <stddef.h>
24#include <ctype.h>
25
26#include "init.h"
27#include "parser.h"
28#include "init_parser.h"
29#include "log.h"
30#include "list.h"
31#include "property_service.h"
32#include "util.h"
33
34#include <cutils/iosched_policy.h>
35
36#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
37#include <sys/_system_properties.h>
38
39static list_declare(service_list);
40static list_declare(action_list);
41static list_declare(action_queue);
42
43static void *parse_service(struct parse_state *state, int nargs, char **args);
44static void parse_line_service(struct parse_state *state, int nargs, char **args);
45
46static void *parse_action(struct parse_state *state, int nargs, char **args);
47static void parse_line_action(struct parse_state *state, int nargs, char **args);
48
49#define SECTION 0x01
50#define COMMAND 0x02
51#define OPTION  0x04
52
53#include "keywords.h"
54
55#define KEYWORD(symbol, flags, nargs, func) \
56    [ K_##symbol ] = { #symbol, func, nargs + 1, flags, },
57
58struct {
59    const char *name;
60    int (*func)(int nargs, char **args);
61    unsigned char nargs;
62    unsigned char flags;
63} keyword_info[KEYWORD_COUNT] = {
64    [ K_UNKNOWN ] = { "unknown", 0, 0, 0 },
65#include "keywords.h"
66};
67#undef KEYWORD
68
69#define kw_is(kw, type) (keyword_info[kw].flags & (type))
70#define kw_name(kw) (keyword_info[kw].name)
71#define kw_func(kw) (keyword_info[kw].func)
72#define kw_nargs(kw) (keyword_info[kw].nargs)
73
74int lookup_keyword(const char *s)
75{
76    switch (*s++) {
77    case 'c':
78    if (!strcmp(s, "opy")) return K_copy;
79        if (!strcmp(s, "apability")) return K_capability;
80        if (!strcmp(s, "hdir")) return K_chdir;
81        if (!strcmp(s, "hroot")) return K_chroot;
82        if (!strcmp(s, "lass")) return K_class;
83        if (!strcmp(s, "lass_start")) return K_class_start;
84        if (!strcmp(s, "lass_stop")) return K_class_stop;
85        if (!strcmp(s, "onsole")) return K_console;
86        if (!strcmp(s, "hown")) return K_chown;
87        if (!strcmp(s, "hmod")) return K_chmod;
88        if (!strcmp(s, "ritical")) return K_critical;
89        break;
90    case 'd':
91        if (!strcmp(s, "isabled")) return K_disabled;
92        if (!strcmp(s, "omainname")) return K_domainname;
93        break;
94    case 'e':
95        if (!strcmp(s, "xec")) return K_exec;
96        if (!strcmp(s, "xport")) return K_export;
97        break;
98    case 'g':
99        if (!strcmp(s, "roup")) return K_group;
100        break;
101    case 'h':
102        if (!strcmp(s, "ostname")) return K_hostname;
103        break;
104    case 'i':
105        if (!strcmp(s, "oprio")) return K_ioprio;
106        if (!strcmp(s, "fup")) return K_ifup;
107        if (!strcmp(s, "nsmod")) return K_insmod;
108        if (!strcmp(s, "mport")) return K_import;
109        break;
110    case 'k':
111        if (!strcmp(s, "eycodes")) return K_keycodes;
112        break;
113    case 'l':
114        if (!strcmp(s, "oglevel")) return K_loglevel;
115        break;
116    case 'm':
117        if (!strcmp(s, "kdir")) return K_mkdir;
118        if (!strcmp(s, "ount")) return K_mount;
119        break;
120    case 'o':
121        if (!strcmp(s, "n")) return K_on;
122        if (!strcmp(s, "neshot")) return K_oneshot;
123        if (!strcmp(s, "nrestart")) return K_onrestart;
124        break;
125    case 'r':
126        if (!strcmp(s, "estart")) return K_restart;
127        break;
128    case 's':
129        if (!strcmp(s, "ervice")) return K_service;
130        if (!strcmp(s, "etenv")) return K_setenv;
131        if (!strcmp(s, "etkey")) return K_setkey;
132        if (!strcmp(s, "etprop")) return K_setprop;
133        if (!strcmp(s, "etrlimit")) return K_setrlimit;
134        if (!strcmp(s, "low_start")) return K_slow_start;
135        if (!strcmp(s, "ocket")) return K_socket;
136        if (!strcmp(s, "tart")) return K_start;
137        if (!strcmp(s, "top")) return K_stop;
138        if (!strcmp(s, "ymlink")) return K_symlink;
139        if (!strcmp(s, "ysclktz")) return K_sysclktz;
140        break;
141    case 't':
142        if (!strcmp(s, "rigger")) return K_trigger;
143        break;
144    case 'u':
145        if (!strcmp(s, "ser")) return K_user;
146        break;
147    case 'w':
148        if (!strcmp(s, "rite")) return K_write;
149        if (!strcmp(s, "ait")) return K_wait;
150        break;
151    }
152    return K_UNKNOWN;
153}
154
155void parse_line_no_op(struct parse_state *state, int nargs, char **args)
156{
157}
158
159void parse_new_section(struct parse_state *state, int kw,
160                       int nargs, char **args)
161{
162    printf("[ %s %s ]\n", args[0],
163           nargs > 1 ? args[1] : "");
164    switch(kw) {
165    case K_service:
166        state->context = parse_service(state, nargs, args);
167        if (state->context) {
168            state->parse_line = parse_line_service;
169            return;
170        }
171        break;
172    case K_on:
173        state->context = parse_action(state, nargs, args);
174        if (state->context) {
175            state->parse_line = parse_line_action;
176            return;
177        }
178        break;
179    }
180    state->parse_line = parse_line_no_op;
181}
182
183static void parse_config(const char *fn, char *s)
184{
185    struct parse_state state;
186    char *args[INIT_PARSER_MAXARGS];
187    int nargs;
188
189    nargs = 0;
190    state.filename = fn;
191    state.line = 1;
192    state.ptr = s;
193    state.nexttoken = 0;
194    state.parse_line = parse_line_no_op;
195    for (;;) {
196        switch (next_token(&state)) {
197        case T_EOF:
198            state.parse_line(&state, 0, 0);
199            return;
200        case T_NEWLINE:
201            if (nargs) {
202                int kw = lookup_keyword(args[0]);
203                if (kw_is(kw, SECTION)) {
204                    state.parse_line(&state, 0, 0);
205                    parse_new_section(&state, kw, nargs, args);
206                } else {
207                    state.parse_line(&state, nargs, args);
208                }
209                nargs = 0;
210            }
211            break;
212        case T_TEXT:
213            if (nargs < INIT_PARSER_MAXARGS) {
214                args[nargs++] = state.text;
215            }
216            break;
217        }
218    }
219}
220
221int init_parse_config_file(const char *fn)
222{
223    char *data;
224    data = read_file(fn, 0);
225    if (!data) return -1;
226
227    parse_config(fn, data);
228    DUMP();
229    return 0;
230}
231
232static int valid_name(const char *name)
233{
234    if (strlen(name) > 16) {
235        return 0;
236    }
237    while (*name) {
238        if (!isalnum(*name) && (*name != '_') && (*name != '-')) {
239            return 0;
240        }
241        name++;
242    }
243    return 1;
244}
245
246struct service *service_find_by_name(const char *name)
247{
248    struct listnode *node;
249    struct service *svc;
250    list_for_each(node, &service_list) {
251        svc = node_to_item(node, struct service, slist);
252        if (!strcmp(svc->name, name)) {
253            return svc;
254        }
255    }
256    return 0;
257}
258
259struct service *service_find_by_pid(pid_t pid)
260{
261    struct listnode *node;
262    struct service *svc;
263    list_for_each(node, &service_list) {
264        svc = node_to_item(node, struct service, slist);
265        if (svc->pid == pid) {
266            return svc;
267        }
268    }
269    return 0;
270}
271
272struct service *service_find_by_keychord(int keychord_id)
273{
274    struct listnode *node;
275    struct service *svc;
276    list_for_each(node, &service_list) {
277        svc = node_to_item(node, struct service, slist);
278        if (svc->keychord_id == keychord_id) {
279            return svc;
280        }
281    }
282    return 0;
283}
284
285void service_for_each(void (*func)(struct service *svc))
286{
287    struct listnode *node;
288    struct service *svc;
289    list_for_each(node, &service_list) {
290        svc = node_to_item(node, struct service, slist);
291        func(svc);
292    }
293}
294
295void service_for_each_class(const char *classname,
296                            void (*func)(struct service *svc))
297{
298    struct listnode *node;
299    struct service *svc;
300    list_for_each(node, &service_list) {
301        svc = node_to_item(node, struct service, slist);
302        if (!strcmp(svc->classname, classname)) {
303            func(svc);
304        }
305    }
306}
307
308void service_for_each_flags(unsigned matchflags,
309                            void (*func)(struct service *svc))
310{
311    struct listnode *node;
312    struct service *svc;
313    list_for_each(node, &service_list) {
314        svc = node_to_item(node, struct service, slist);
315        if (svc->flags & matchflags) {
316            func(svc);
317        }
318    }
319}
320
321void action_for_each_trigger(const char *trigger,
322                             void (*func)(struct action *act))
323{
324    struct listnode *node;
325    struct action *act;
326    list_for_each(node, &action_list) {
327        act = node_to_item(node, struct action, alist);
328        if (!strcmp(act->name, trigger)) {
329            func(act);
330        }
331    }
332}
333
334void queue_property_triggers(const char *name, const char *value)
335{
336    struct listnode *node;
337    struct action *act;
338    list_for_each(node, &action_list) {
339        act = node_to_item(node, struct action, alist);
340        if (!strncmp(act->name, "property:", strlen("property:"))) {
341            const char *test = act->name + strlen("property:");
342            int name_length = strlen(name);
343
344            if (!strncmp(name, test, name_length) &&
345                    test[name_length] == '=' &&
346                    !strcmp(test + name_length + 1, value)) {
347                action_add_queue_tail(act);
348            }
349        }
350    }
351}
352
353void queue_all_property_triggers()
354{
355    struct listnode *node;
356    struct action *act;
357    list_for_each(node, &action_list) {
358        act = node_to_item(node, struct action, alist);
359        if (!strncmp(act->name, "property:", strlen("property:"))) {
360            /* parse property name and value
361               syntax is property:<name>=<value> */
362            const char* name = act->name + strlen("property:");
363            const char* equals = strchr(name, '=');
364            if (equals) {
365                char prop_name[PROP_NAME_MAX + 1];
366                const char* value;
367                int length = equals - name;
368                if (length > PROP_NAME_MAX) {
369                    ERROR("property name too long in trigger %s", act->name);
370                } else {
371                    memcpy(prop_name, name, length);
372                    prop_name[length] = 0;
373
374                    /* does the property exist, and match the trigger value? */
375                    value = property_get(prop_name);
376                    if (value && !strcmp(equals + 1, value)) {
377                        action_add_queue_tail(act);
378                    }
379                }
380            }
381        }
382    }
383}
384
385void queue_builtin_action(int (*func)(int nargs, char **args), char *name)
386{
387    struct action *act;
388    struct command *cmd;
389
390    act = calloc(1, sizeof(*act));
391    act->name = name;
392    list_init(&act->commands);
393
394    cmd = calloc(1, sizeof(*cmd));
395    cmd->func = func;
396    cmd->args[0] = name;
397    list_add_tail(&act->commands, &cmd->clist);
398
399    list_add_tail(&action_list, &act->alist);
400    action_add_queue_tail(act);
401}
402
403void action_add_queue_tail(struct action *act)
404{
405    list_add_tail(&action_queue, &act->qlist);
406}
407
408struct action *action_remove_queue_head(void)
409{
410    if (list_empty(&action_queue)) {
411        return 0;
412    } else {
413        struct listnode *node = list_head(&action_queue);
414        struct action *act = node_to_item(node, struct action, qlist);
415        list_remove(node);
416        return act;
417    }
418}
419
420int action_queue_empty()
421{
422    return list_empty(&action_queue);
423}
424
425static void *parse_service(struct parse_state *state, int nargs, char **args)
426{
427    struct service *svc;
428    if (nargs < 3) {
429        parse_error(state, "services must have a name and a program\n");
430        return 0;
431    }
432    if (!valid_name(args[1])) {
433        parse_error(state, "invalid service name '%s'\n", args[1]);
434        return 0;
435    }
436
437    svc = service_find_by_name(args[1]);
438    if (svc) {
439        parse_error(state, "ignored duplicate definition of service '%s'\n", args[1]);
440        return 0;
441    }
442
443    nargs -= 2;
444    svc = calloc(1, sizeof(*svc) + sizeof(char*) * nargs);
445    if (!svc) {
446        parse_error(state, "out of memory\n");
447        return 0;
448    }
449    svc->name = args[1];
450    svc->classname = "default";
451    memcpy(svc->args, args + 2, sizeof(char*) * nargs);
452    svc->args[nargs] = 0;
453    svc->nargs = nargs;
454    svc->onrestart.name = "onrestart";
455    list_init(&svc->onrestart.commands);
456    list_add_tail(&service_list, &svc->slist);
457    return svc;
458}
459
460static void parse_line_service(struct parse_state *state, int nargs, char **args)
461{
462    struct service *svc = state->context;
463    struct command *cmd;
464    int i, kw, kw_nargs;
465
466    if (nargs == 0) {
467        return;
468    }
469
470    svc->ioprio_class = IoSchedClass_NONE;
471
472    kw = lookup_keyword(args[0]);
473    switch (kw) {
474    case K_capability:
475        break;
476    case K_class:
477        if (nargs != 2) {
478            parse_error(state, "class option requires a classname\n");
479        } else {
480            svc->classname = args[1];
481        }
482        break;
483    case K_console:
484        svc->flags |= SVC_CONSOLE;
485        break;
486    case K_disabled:
487        svc->flags |= SVC_DISABLED;
488        break;
489    case K_ioprio:
490        if (nargs != 3) {
491            parse_error(state, "ioprio optin usage: ioprio <rt|be|idle> <ioprio 0-7>\n");
492        } else {
493            svc->ioprio_pri = strtoul(args[2], 0, 8);
494
495            if (svc->ioprio_pri < 0 || svc->ioprio_pri > 7) {
496                parse_error(state, "priority value must be range 0 - 7\n");
497                break;
498            }
499
500            if (!strcmp(args[1], "rt")) {
501                svc->ioprio_class = IoSchedClass_RT;
502            } else if (!strcmp(args[1], "be")) {
503                svc->ioprio_class = IoSchedClass_BE;
504            } else if (!strcmp(args[1], "idle")) {
505                svc->ioprio_class = IoSchedClass_IDLE;
506            } else {
507                parse_error(state, "ioprio option usage: ioprio <rt|be|idle> <0-7>\n");
508            }
509        }
510        break;
511    case K_group:
512        if (nargs < 2) {
513            parse_error(state, "group option requires a group id\n");
514        } else if (nargs > NR_SVC_SUPP_GIDS + 2) {
515            parse_error(state, "group option accepts at most %d supp. groups\n",
516                        NR_SVC_SUPP_GIDS);
517        } else {
518            int n;
519            svc->gid = decode_uid(args[1]);
520            for (n = 2; n < nargs; n++) {
521                svc->supp_gids[n-2] = decode_uid(args[n]);
522            }
523            svc->nr_supp_gids = n - 2;
524        }
525        break;
526    case K_keycodes:
527        if (nargs < 2) {
528            parse_error(state, "keycodes option requires atleast one keycode\n");
529        } else {
530            svc->keycodes = malloc((nargs - 1) * sizeof(svc->keycodes[0]));
531            if (!svc->keycodes) {
532                parse_error(state, "could not allocate keycodes\n");
533            } else {
534                svc->nkeycodes = nargs - 1;
535                for (i = 1; i < nargs; i++) {
536                    svc->keycodes[i - 1] = atoi(args[i]);
537                }
538            }
539        }
540        break;
541    case K_oneshot:
542        svc->flags |= SVC_ONESHOT;
543        break;
544    case K_onrestart:
545        nargs--;
546        args++;
547        kw = lookup_keyword(args[0]);
548        if (!kw_is(kw, COMMAND)) {
549            parse_error(state, "invalid command '%s'\n", args[0]);
550            break;
551        }
552        kw_nargs = kw_nargs(kw);
553        if (nargs < kw_nargs) {
554            parse_error(state, "%s requires %d %s\n", args[0], kw_nargs - 1,
555                kw_nargs > 2 ? "arguments" : "argument");
556            break;
557        }
558
559        cmd = malloc(sizeof(*cmd) + sizeof(char*) * nargs);
560        cmd->func = kw_func(kw);
561        cmd->nargs = nargs;
562        memcpy(cmd->args, args, sizeof(char*) * nargs);
563        list_add_tail(&svc->onrestart.commands, &cmd->clist);
564        break;
565    case K_critical:
566        svc->flags |= SVC_CRITICAL;
567        break;
568    case K_slow_start:
569        svc->flags |= SVC_SLOW_START;
570        break;
571    case K_setenv: { /* name value */
572        struct svcenvinfo *ei;
573        if (nargs < 2) {
574            parse_error(state, "setenv option requires name and value arguments\n");
575            break;
576        }
577        ei = calloc(1, sizeof(*ei));
578        if (!ei) {
579            parse_error(state, "out of memory\n");
580            break;
581        }
582        ei->name = args[1];
583        ei->value = args[2];
584        ei->next = svc->envvars;
585        svc->envvars = ei;
586        break;
587    }
588    case K_socket: {/* name type perm [ uid gid ] */
589        struct socketinfo *si;
590        if (nargs < 4) {
591            parse_error(state, "socket option requires name, type, perm arguments\n");
592            break;
593        }
594        if (strcmp(args[2],"dgram") && strcmp(args[2],"stream")
595                && strcmp(args[2],"seqpacket")) {
596            parse_error(state, "socket type must be 'dgram', 'stream' or 'seqpacket'\n");
597            break;
598        }
599        si = calloc(1, sizeof(*si));
600        if (!si) {
601            parse_error(state, "out of memory\n");
602            break;
603        }
604        si->name = args[1];
605        si->type = args[2];
606        si->perm = strtoul(args[3], 0, 8);
607        if (nargs > 4)
608            si->uid = decode_uid(args[4]);
609        if (nargs > 5)
610            si->gid = decode_uid(args[5]);
611        si->next = svc->sockets;
612        svc->sockets = si;
613        break;
614    }
615    case K_user:
616        if (nargs != 2) {
617            parse_error(state, "user option requires a user id\n");
618        } else {
619            svc->uid = decode_uid(args[1]);
620        }
621        break;
622    default:
623        parse_error(state, "invalid option '%s'\n", args[0]);
624    }
625}
626
627static void *parse_action(struct parse_state *state, int nargs, char **args)
628{
629    struct action *act;
630    if (nargs < 2) {
631        parse_error(state, "actions must have a trigger\n");
632        return 0;
633    }
634    if (nargs > 2) {
635        parse_error(state, "actions may not have extra parameters\n");
636        return 0;
637    }
638    act = calloc(1, sizeof(*act));
639    act->name = args[1];
640    list_init(&act->commands);
641    list_add_tail(&action_list, &act->alist);
642        /* XXX add to hash */
643    return act;
644}
645
646static void parse_line_action(struct parse_state* state, int nargs, char **args)
647{
648    struct command *cmd;
649    struct action *act = state->context;
650    int (*func)(int nargs, char **args);
651    int kw, n;
652
653    if (nargs == 0) {
654        return;
655    }
656
657    kw = lookup_keyword(args[0]);
658    if (!kw_is(kw, COMMAND)) {
659        parse_error(state, "invalid command '%s'\n", args[0]);
660        return;
661    }
662
663    n = kw_nargs(kw);
664    if (nargs < n) {
665        parse_error(state, "%s requires %d %s\n", args[0], n - 1,
666            n > 2 ? "arguments" : "argument");
667        return;
668    }
669    cmd = malloc(sizeof(*cmd) + sizeof(char*) * nargs);
670    cmd->func = kw_func(kw);
671    cmd->nargs = nargs;
672    memcpy(cmd->args, args, sizeof(char*) * nargs);
673    list_add_tail(&act->commands, &cmd->clist);
674}
675