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