1 /*
2 * Copyright (C) 2016 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include "private/icu.h"
30
31 #include <dirent.h>
32 #include <dlfcn.h>
33 #include <pthread.h>
34 #include <stdlib.h>
35
36 #include <async_safe/log.h>
37
38 // Allowed icu4c version numbers are in the range [44, 999].
39 // Gingerbread's icu4c 4.4 is the minimum supported ICU version.
40 static constexpr auto ICUDATA_VERSION_MIN_LENGTH = 2;
41 static constexpr auto ICUDATA_VERSION_MAX_LENGTH = 3;
42 static constexpr auto ICUDATA_VERSION_MIN = 44;
43
44 static char g_icudata_version[ICUDATA_VERSION_MAX_LENGTH + 1];
45
46 static void* g_libicuuc_handle = nullptr;
47
__icu_dat_file_filter(const dirent * dirp)48 static int __icu_dat_file_filter(const dirent* dirp) {
49 const char* name = dirp->d_name;
50
51 // Is the name the right length to match 'icudt(\d\d\d)l.dat'?
52 const size_t len = strlen(name);
53 if (len < 10 + ICUDATA_VERSION_MIN_LENGTH || len > 10 + ICUDATA_VERSION_MAX_LENGTH) return 0;
54
55 return !strncmp(name, "icudt", 5) && !strncmp(&name[len - 5], "l.dat", 5);
56 }
57
__find_icu()58 static bool __find_icu() {
59 dirent** namelist = nullptr;
60 int n = scandir("/system/usr/icu", &namelist, &__icu_dat_file_filter, alphasort);
61 int max_version = -1;
62 while (n--) {
63 // We prefer the latest version available.
64 int version = atoi(&namelist[n]->d_name[strlen("icudt")]);
65 if (version != 0 && version > max_version) max_version = version;
66 free(namelist[n]);
67 }
68 free(namelist);
69
70 if (max_version == -1 || max_version < ICUDATA_VERSION_MIN) {
71 async_safe_write_log(ANDROID_LOG_ERROR, "bionic-icu", "couldn't find an ICU .dat file");
72 return false;
73 }
74
75 snprintf(g_icudata_version, sizeof(g_icudata_version), "_%d", max_version);
76
77 g_libicuuc_handle = dlopen("libicuuc.so", RTLD_LOCAL);
78 if (g_libicuuc_handle == nullptr) {
79 async_safe_format_log(ANDROID_LOG_ERROR, "bionic-icu", "couldn't open libicuuc.so: %s",
80 dlerror());
81 return false;
82 }
83
84 return true;
85 }
86
__find_icu_symbol(const char * symbol_name)87 void* __find_icu_symbol(const char* symbol_name) {
88 static bool found_icu = __find_icu();
89 if (!found_icu) return nullptr;
90
91 char versioned_symbol_name[strlen(symbol_name) + sizeof(g_icudata_version)];
92 snprintf(versioned_symbol_name, sizeof(versioned_symbol_name), "%s%s",
93 symbol_name, g_icudata_version);
94
95 void* symbol = dlsym(g_libicuuc_handle, versioned_symbol_name);
96 if (symbol == nullptr) {
97 async_safe_format_log(ANDROID_LOG_ERROR, "bionic-icu", "couldn't find %s",
98 versioned_symbol_name);
99 }
100 return symbol;
101 }
102