The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* Copyright 2008 The Android Open Source Project |
| 2 | */ |
| 3 | |
| 4 | #include <stdio.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <errno.h> |
| 7 | #include <fcntl.h> |
| 8 | |
| 9 | #include <private/android_filesystem_config.h> |
| 10 | |
| 11 | #include "binder.h" |
| 12 | |
| 13 | #if 0 |
| 14 | #define LOGI(x...) fprintf(stderr, "svcmgr: " x) |
| 15 | #define LOGE(x...) fprintf(stderr, "svcmgr: " x) |
| 16 | #else |
| 17 | #define LOG_TAG "ServiceManager" |
| 18 | #include <cutils/log.h> |
| 19 | #endif |
| 20 | |
| 21 | /* TODO: |
| 22 | * These should come from a config file or perhaps be |
| 23 | * based on some namespace rules of some sort (media |
| 24 | * uid can register media.*, etc) |
| 25 | */ |
| 26 | static struct { |
| 27 | unsigned uid; |
| 28 | const char *name; |
| 29 | } allowed[] = { |
Glenn Kasten | 871c16c | 2010-03-05 12:18:01 -0800 | [diff] [blame] | 30 | #ifdef LVMX |
| 31 | { AID_MEDIA, "com.lifevibes.mx.ipc" }, |
| 32 | #endif |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 33 | { AID_MEDIA, "media.audio_flinger" }, |
| 34 | { AID_MEDIA, "media.player" }, |
| 35 | { AID_MEDIA, "media.camera" }, |
Eric Laurent | a553c25 | 2009-07-17 12:17:14 -0700 | [diff] [blame] | 36 | { AID_MEDIA, "media.audio_policy" }, |
aimitakeshi | d074e30 | 2010-07-29 10:12:27 +0900 | [diff] [blame] | 37 | { AID_DRMIO, "drm.drmIOService" }, |
| 38 | { AID_DRM, "drm.drmManager" }, |
Nick Pelly | cd0e839 | 2010-10-13 17:25:24 -0700 | [diff] [blame] | 39 | { AID_NFC, "nfc" }, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 40 | { AID_RADIO, "radio.phone" }, |
| 41 | { AID_RADIO, "radio.sms" }, |
| 42 | { AID_RADIO, "radio.phonesubinfo" }, |
| 43 | { AID_RADIO, "radio.simphonebook" }, |
| 44 | /* TODO: remove after phone services are updated: */ |
| 45 | { AID_RADIO, "phone" }, |
Hung-ying Tyan | 7e54ef7 | 2010-09-25 22:49:59 +0800 | [diff] [blame] | 46 | { AID_RADIO, "sip" }, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 47 | { AID_RADIO, "isms" }, |
| 48 | { AID_RADIO, "iphonesubinfo" }, |
| 49 | { AID_RADIO, "simphonebook" }, |
| 50 | }; |
| 51 | |
| 52 | void *svcmgr_handle; |
| 53 | |
| 54 | const char *str8(uint16_t *x) |
| 55 | { |
| 56 | static char buf[128]; |
| 57 | unsigned max = 127; |
| 58 | char *p = buf; |
| 59 | |
| 60 | if (x) { |
| 61 | while (*x && max--) { |
| 62 | *p++ = *x++; |
| 63 | } |
| 64 | } |
| 65 | *p++ = 0; |
| 66 | return buf; |
| 67 | } |
| 68 | |
| 69 | int str16eq(uint16_t *a, const char *b) |
| 70 | { |
| 71 | while (*a && *b) |
| 72 | if (*a++ != *b++) return 0; |
| 73 | if (*a || *b) |
| 74 | return 0; |
| 75 | return 1; |
| 76 | } |
| 77 | |
| 78 | int svc_can_register(unsigned uid, uint16_t *name) |
| 79 | { |
| 80 | unsigned n; |
| 81 | |
| 82 | if ((uid == 0) || (uid == AID_SYSTEM)) |
| 83 | return 1; |
| 84 | |
| 85 | for (n = 0; n < sizeof(allowed) / sizeof(allowed[0]); n++) |
| 86 | if ((uid == allowed[n].uid) && str16eq(name, allowed[n].name)) |
| 87 | return 1; |
| 88 | |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | struct svcinfo |
| 93 | { |
| 94 | struct svcinfo *next; |
| 95 | void *ptr; |
| 96 | struct binder_death death; |
| 97 | unsigned len; |
| 98 | uint16_t name[0]; |
| 99 | }; |
| 100 | |
| 101 | struct svcinfo *svclist = 0; |
| 102 | |
| 103 | struct svcinfo *find_svc(uint16_t *s16, unsigned len) |
| 104 | { |
| 105 | struct svcinfo *si; |
| 106 | |
| 107 | for (si = svclist; si; si = si->next) { |
| 108 | if ((len == si->len) && |
| 109 | !memcmp(s16, si->name, len * sizeof(uint16_t))) { |
| 110 | return si; |
| 111 | } |
| 112 | } |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | void svcinfo_death(struct binder_state *bs, void *ptr) |
| 117 | { |
| 118 | struct svcinfo *si = ptr; |
| 119 | LOGI("service '%s' died\n", str8(si->name)); |
| 120 | if (si->ptr) { |
| 121 | binder_release(bs, si->ptr); |
| 122 | si->ptr = 0; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | uint16_t svcmgr_id[] = { |
| 127 | 'a','n','d','r','o','i','d','.','o','s','.', |
| 128 | 'I','S','e','r','v','i','c','e','M','a','n','a','g','e','r' |
| 129 | }; |
| 130 | |
| 131 | |
| 132 | void *do_find_service(struct binder_state *bs, uint16_t *s, unsigned len) |
| 133 | { |
| 134 | struct svcinfo *si; |
| 135 | si = find_svc(s, len); |
| 136 | |
| 137 | // LOGI("check_service('%s') ptr = %p\n", str8(s), si ? si->ptr : 0); |
| 138 | if (si && si->ptr) { |
| 139 | return si->ptr; |
| 140 | } else { |
| 141 | return 0; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | int do_add_service(struct binder_state *bs, |
| 146 | uint16_t *s, unsigned len, |
| 147 | void *ptr, unsigned uid) |
| 148 | { |
| 149 | struct svcinfo *si; |
| 150 | // LOGI("add_service('%s',%p) uid=%d\n", str8(s), ptr, uid); |
| 151 | |
| 152 | if (!ptr || (len == 0) || (len > 127)) |
| 153 | return -1; |
| 154 | |
| 155 | if (!svc_can_register(uid, s)) { |
| 156 | LOGE("add_service('%s',%p) uid=%d - PERMISSION DENIED\n", |
| 157 | str8(s), ptr, uid); |
| 158 | return -1; |
| 159 | } |
| 160 | |
| 161 | si = find_svc(s, len); |
| 162 | if (si) { |
| 163 | if (si->ptr) { |
| 164 | LOGE("add_service('%s',%p) uid=%d - ALREADY REGISTERED\n", |
| 165 | str8(s), ptr, uid); |
| 166 | return -1; |
| 167 | } |
| 168 | si->ptr = ptr; |
| 169 | } else { |
| 170 | si = malloc(sizeof(*si) + (len + 1) * sizeof(uint16_t)); |
| 171 | if (!si) { |
| 172 | LOGE("add_service('%s',%p) uid=%d - OUT OF MEMORY\n", |
| 173 | str8(s), ptr, uid); |
| 174 | return -1; |
| 175 | } |
| 176 | si->ptr = ptr; |
| 177 | si->len = len; |
| 178 | memcpy(si->name, s, (len + 1) * sizeof(uint16_t)); |
| 179 | si->name[len] = '\0'; |
| 180 | si->death.func = svcinfo_death; |
| 181 | si->death.ptr = si; |
| 182 | si->next = svclist; |
| 183 | svclist = si; |
| 184 | } |
| 185 | |
| 186 | binder_acquire(bs, ptr); |
| 187 | binder_link_to_death(bs, ptr, &si->death); |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | int svcmgr_handler(struct binder_state *bs, |
| 192 | struct binder_txn *txn, |
| 193 | struct binder_io *msg, |
| 194 | struct binder_io *reply) |
| 195 | { |
| 196 | struct svcinfo *si; |
| 197 | uint16_t *s; |
| 198 | unsigned len; |
| 199 | void *ptr; |
Brad Fitzpatrick | 27b3a7a | 2010-06-18 13:07:53 -0700 | [diff] [blame] | 200 | uint32_t strict_policy; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 201 | |
| 202 | // LOGI("target=%p code=%d pid=%d uid=%d\n", |
| 203 | // txn->target, txn->code, txn->sender_pid, txn->sender_euid); |
| 204 | |
| 205 | if (txn->target != svcmgr_handle) |
| 206 | return -1; |
| 207 | |
Brad Fitzpatrick | 27b3a7a | 2010-06-18 13:07:53 -0700 | [diff] [blame] | 208 | // Equivalent to Parcel::enforceInterface(), reading the RPC |
| 209 | // header with the strict mode policy mask and the interface name. |
| 210 | // Note that we ignore the strict_policy and don't propagate it |
| 211 | // further (since we do no outbound RPCs anyway). |
| 212 | strict_policy = bio_get_uint32(msg); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 213 | s = bio_get_string16(msg, &len); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 214 | if ((len != (sizeof(svcmgr_id) / 2)) || |
| 215 | memcmp(svcmgr_id, s, sizeof(svcmgr_id))) { |
| 216 | fprintf(stderr,"invalid id %s\n", str8(s)); |
| 217 | return -1; |
| 218 | } |
| 219 | |
| 220 | switch(txn->code) { |
| 221 | case SVC_MGR_GET_SERVICE: |
| 222 | case SVC_MGR_CHECK_SERVICE: |
| 223 | s = bio_get_string16(msg, &len); |
| 224 | ptr = do_find_service(bs, s, len); |
| 225 | if (!ptr) |
| 226 | break; |
| 227 | bio_put_ref(reply, ptr); |
| 228 | return 0; |
| 229 | |
| 230 | case SVC_MGR_ADD_SERVICE: |
| 231 | s = bio_get_string16(msg, &len); |
| 232 | ptr = bio_get_ref(msg); |
| 233 | if (do_add_service(bs, s, len, ptr, txn->sender_euid)) |
| 234 | return -1; |
| 235 | break; |
| 236 | |
| 237 | case SVC_MGR_LIST_SERVICES: { |
| 238 | unsigned n = bio_get_uint32(msg); |
| 239 | |
| 240 | si = svclist; |
| 241 | while ((n-- > 0) && si) |
| 242 | si = si->next; |
| 243 | if (si) { |
| 244 | bio_put_string16(reply, si->name); |
| 245 | return 0; |
| 246 | } |
| 247 | return -1; |
| 248 | } |
| 249 | default: |
| 250 | LOGE("unknown code %d\n", txn->code); |
| 251 | return -1; |
| 252 | } |
| 253 | |
| 254 | bio_put_uint32(reply, 0); |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | int main(int argc, char **argv) |
| 259 | { |
| 260 | struct binder_state *bs; |
| 261 | void *svcmgr = BINDER_SERVICE_MANAGER; |
| 262 | |
| 263 | bs = binder_open(128*1024); |
| 264 | |
| 265 | if (binder_become_context_manager(bs)) { |
| 266 | LOGE("cannot become context manager (%s)\n", strerror(errno)); |
| 267 | return -1; |
| 268 | } |
| 269 | |
| 270 | svcmgr_handle = svcmgr; |
| 271 | binder_loop(bs, svcmgr_handler); |
| 272 | return 0; |
| 273 | } |