| /* Copyright 2008 The Android Open Source Project |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| |
| #include <private/android_filesystem_config.h> |
| |
| #include "binder.h" |
| |
| #if 0 |
| #define ALOGI(x...) fprintf(stderr, "svcmgr: " x) |
| #define ALOGE(x...) fprintf(stderr, "svcmgr: " x) |
| #else |
| #define LOG_TAG "ServiceManager" |
| #include <cutils/log.h> |
| #endif |
| |
| /* TODO: |
| * These should come from a config file or perhaps be |
| * based on some namespace rules of some sort (media |
| * uid can register media.*, etc) |
| */ |
| static struct { |
| uid_t uid; |
| const char *name; |
| } allowed[] = { |
| { AID_MEDIA, "media.audio_flinger" }, |
| { AID_MEDIA, "media.log" }, |
| { AID_MEDIA, "media.player" }, |
| { AID_MEDIA, "media.camera" }, |
| { AID_MEDIA, "media.audio_policy" }, |
| { AID_DRM, "drm.drmManager" }, |
| { AID_NFC, "nfc" }, |
| { AID_BLUETOOTH, "bluetooth" }, |
| { AID_RADIO, "radio.phone" }, |
| { AID_RADIO, "radio.sms" }, |
| { AID_RADIO, "radio.phonesubinfo" }, |
| { AID_RADIO, "radio.simphonebook" }, |
| /* TODO: remove after phone services are updated: */ |
| { AID_RADIO, "phone" }, |
| { AID_RADIO, "sip" }, |
| { AID_RADIO, "isms" }, |
| { AID_RADIO, "iphonesubinfo" }, |
| { AID_RADIO, "simphonebook" }, |
| { AID_MEDIA, "common_time.clock" }, |
| { AID_MEDIA, "common_time.config" }, |
| { AID_KEYSTORE, "android.security.keystore" }, |
| }; |
| |
| void *svcmgr_handle; |
| |
| const char *str8(const uint16_t *x) |
| { |
| static char buf[128]; |
| unsigned max = 127; |
| char *p = buf; |
| |
| if (x) { |
| while (*x && max--) { |
| *p++ = *x++; |
| } |
| } |
| *p++ = 0; |
| return buf; |
| } |
| |
| int str16eq(const uint16_t *a, const char *b) |
| { |
| while (*a && *b) |
| if (*a++ != *b++) return 0; |
| if (*a || *b) |
| return 0; |
| return 1; |
| } |
| |
| int svc_can_register(uid_t uid, const uint16_t *name) |
| { |
| size_t n; |
| |
| if ((uid == 0) || (uid == AID_SYSTEM)) |
| return 1; |
| |
| for (n = 0; n < sizeof(allowed) / sizeof(allowed[0]); n++) |
| if ((uid == allowed[n].uid) && str16eq(name, allowed[n].name)) |
| return 1; |
| |
| return 0; |
| } |
| |
| struct svcinfo |
| { |
| struct svcinfo *next; |
| void *ptr; |
| struct binder_death death; |
| int allow_isolated; |
| size_t len; |
| uint16_t name[0]; |
| }; |
| |
| struct svcinfo *svclist = NULL; |
| |
| struct svcinfo *find_svc(const uint16_t *s16, size_t len) |
| { |
| struct svcinfo *si; |
| |
| for (si = svclist; si; si = si->next) { |
| if ((len == si->len) && |
| !memcmp(s16, si->name, len * sizeof(uint16_t))) { |
| return si; |
| } |
| } |
| return NULL; |
| } |
| |
| void svcinfo_death(struct binder_state *bs, void *ptr) |
| { |
| struct svcinfo *si = (struct svcinfo* ) ptr; |
| |
| ALOGI("service '%s' died\n", str8(si->name)); |
| if (si->ptr) { |
| binder_release(bs, si->ptr); |
| si->ptr = 0; |
| } |
| } |
| |
| uint16_t svcmgr_id[] = { |
| 'a','n','d','r','o','i','d','.','o','s','.', |
| 'I','S','e','r','v','i','c','e','M','a','n','a','g','e','r' |
| }; |
| |
| |
| void *do_find_service(struct binder_state *bs, const uint16_t *s, size_t len, uid_t uid) |
| { |
| struct svcinfo *si; |
| si = find_svc(s, len); |
| |
| // ALOGI("check_service('%s') ptr = %p\n", str8(s), si ? si->ptr : 0); |
| if (si && si->ptr) { |
| if (!si->allow_isolated) { |
| // If this service doesn't allow access from isolated processes, |
| // then check the uid to see if it is isolated. |
| uid_t appid = uid % AID_USER; |
| if (appid >= AID_ISOLATED_START && appid <= AID_ISOLATED_END) { |
| return 0; |
| } |
| } |
| return si->ptr; |
| } else { |
| return 0; |
| } |
| } |
| |
| int do_add_service(struct binder_state *bs, |
| const uint16_t *s, size_t len, |
| void *ptr, uid_t uid, int allow_isolated) |
| { |
| struct svcinfo *si; |
| //ALOGI("add_service('%s',%p,%s) uid=%d\n", str8(s), ptr, |
| // allow_isolated ? "allow_isolated" : "!allow_isolated", uid); |
| |
| if (!ptr || (len == 0) || (len > 127)) |
| return -1; |
| |
| if (!svc_can_register(uid, s)) { |
| ALOGE("add_service('%s',%p) uid=%d - PERMISSION DENIED\n", |
| str8(s), ptr, uid); |
| return -1; |
| } |
| |
| si = find_svc(s, len); |
| if (si) { |
| if (si->ptr) { |
| ALOGE("add_service('%s',%p) uid=%d - ALREADY REGISTERED, OVERRIDE\n", |
| str8(s), ptr, uid); |
| svcinfo_death(bs, si); |
| } |
| si->ptr = ptr; |
| } else { |
| si = malloc(sizeof(*si) + (len + 1) * sizeof(uint16_t)); |
| if (!si) { |
| ALOGE("add_service('%s',%p) uid=%d - OUT OF MEMORY\n", |
| str8(s), ptr, uid); |
| return -1; |
| } |
| si->ptr = ptr; |
| si->len = len; |
| memcpy(si->name, s, (len + 1) * sizeof(uint16_t)); |
| si->name[len] = '\0'; |
| si->death.func = (void*) svcinfo_death; |
| si->death.ptr = si; |
| si->allow_isolated = allow_isolated; |
| si->next = svclist; |
| svclist = si; |
| } |
| |
| binder_acquire(bs, ptr); |
| binder_link_to_death(bs, ptr, &si->death); |
| return 0; |
| } |
| |
| int svcmgr_handler(struct binder_state *bs, |
| struct binder_transaction_data *txn, |
| struct binder_io *msg, |
| struct binder_io *reply) |
| { |
| struct svcinfo *si; |
| uint16_t *s; |
| size_t len; |
| void *ptr; |
| uint32_t strict_policy; |
| int allow_isolated; |
| |
| // ALOGI("target=%p code=%d pid=%d uid=%d\n", |
| // txn->target, txn->code, txn->sender_pid, txn->sender_euid); |
| |
| if (txn->target.handle != svcmgr_handle) |
| return -1; |
| |
| // Equivalent to Parcel::enforceInterface(), reading the RPC |
| // header with the strict mode policy mask and the interface name. |
| // Note that we ignore the strict_policy and don't propagate it |
| // further (since we do no outbound RPCs anyway). |
| strict_policy = bio_get_uint32(msg); |
| s = bio_get_string16(msg, &len); |
| if ((len != (sizeof(svcmgr_id) / 2)) || |
| memcmp(svcmgr_id, s, sizeof(svcmgr_id))) { |
| fprintf(stderr,"invalid id %s\n", str8(s)); |
| return -1; |
| } |
| |
| switch(txn->code) { |
| case SVC_MGR_GET_SERVICE: |
| case SVC_MGR_CHECK_SERVICE: |
| s = bio_get_string16(msg, &len); |
| ptr = do_find_service(bs, s, len, txn->sender_euid); |
| if (!ptr) |
| break; |
| bio_put_ref(reply, ptr); |
| return 0; |
| |
| case SVC_MGR_ADD_SERVICE: |
| s = bio_get_string16(msg, &len); |
| ptr = bio_get_ref(msg); |
| allow_isolated = bio_get_uint32(msg) ? 1 : 0; |
| if (do_add_service(bs, s, len, ptr, txn->sender_euid, allow_isolated)) |
| return -1; |
| break; |
| |
| case SVC_MGR_LIST_SERVICES: { |
| unsigned n = bio_get_uint32(msg); |
| |
| si = svclist; |
| while ((n-- > 0) && si) |
| si = si->next; |
| if (si) { |
| bio_put_string16(reply, si->name); |
| return 0; |
| } |
| return -1; |
| } |
| default: |
| ALOGE("unknown code %d\n", txn->code); |
| return -1; |
| } |
| |
| bio_put_uint32(reply, 0); |
| return 0; |
| } |
| |
| int main(int argc, char **argv) |
| { |
| struct binder_state *bs; |
| |
| bs = binder_open(128*1024); |
| if (!bs) { |
| ALOGE("failed to open binder driver\n"); |
| return -1; |
| } |
| |
| if (binder_become_context_manager(bs)) { |
| ALOGE("cannot become context manager (%s)\n", strerror(errno)); |
| return -1; |
| } |
| |
| svcmgr_handle = BINDER_SERVICE_MANAGER; |
| binder_loop(bs, svcmgr_handler); |
| |
| return 0; |
| } |