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Diffstat (limited to 'cmds/servicemanager/service_manager.c')
-rw-r--r-- | cmds/servicemanager/service_manager.c | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/cmds/servicemanager/service_manager.c b/cmds/servicemanager/service_manager.c new file mode 100644 index 0000000..3314dc3 --- /dev/null +++ b/cmds/servicemanager/service_manager.c @@ -0,0 +1,285 @@ +/* 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 { + unsigned uid; + const char *name; +} allowed[] = { + { AID_MEDIA, "media.audio_flinger" }, + { 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" }, +}; + +void *svcmgr_handle; + +const char *str8(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(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(unsigned uid, uint16_t *name) +{ + unsigned 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; + unsigned len; + uint16_t name[0]; +}; + +struct svcinfo *svclist = 0; + +struct svcinfo *find_svc(uint16_t *s16, unsigned 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 0; +} + +void svcinfo_death(struct binder_state *bs, void *ptr) +{ + struct svcinfo *si = 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, uint16_t *s, unsigned len, unsigned 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. + unsigned 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, + uint16_t *s, unsigned len, + void *ptr, unsigned 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 = 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_txn *txn, + struct binder_io *msg, + struct binder_io *reply) +{ + struct svcinfo *si; + uint16_t *s; + unsigned 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 != 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; + void *svcmgr = BINDER_SERVICE_MANAGER; + + bs = binder_open(128*1024); + + if (binder_become_context_manager(bs)) { + ALOGE("cannot become context manager (%s)\n", strerror(errno)); + return -1; + } + + svcmgr_handle = svcmgr; + binder_loop(bs, svcmgr_handler); + return 0; +} |