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