1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "linkerconfig/librarylistloader.h"
18
19 #include <android-base/result.h>
20 #include <android-base/strings.h>
21 #include <algorithm>
22 #include <fstream>
23 #include <iterator>
24 #include <set>
25 #include <sstream>
26 #include <unordered_map>
27
28 #include "linkerconfig/environment.h"
29 #include "linkerconfig/log.h"
30
31 using LibraryList = std::set<std::string>;
32
33 using android::base::Result;
34
35 namespace {
36 std::unordered_map<std::string, LibraryList> library_file_cache;
GetLibrariesFromFile(std::string file_path)37 Result<LibraryList> GetLibrariesFromFile(std::string file_path) {
38 auto cached_data = library_file_cache.find(file_path);
39 if (cached_data != library_file_cache.end()) {
40 return cached_data->second;
41 }
42
43 std::string library_name;
44 LibraryList library_list;
45 std::ifstream library_file(file_path.c_str(), std::ifstream::in);
46
47 if (!library_file) {
48 return ErrnoErrorf("Failed to open file {}", file_path);
49 }
50
51 while (std::getline(library_file, library_name)) {
52 library_name = android::base::Trim(library_name);
53 if (!library_name.empty()) {
54 library_list.insert(library_name);
55 }
56 }
57
58 library_file_cache.insert({file_path, library_list});
59
60 return library_list;
61 }
62 } // namespace
63
64 namespace android {
65 namespace linkerconfig {
66 namespace generator {
GetLibrariesString(const std::string & library_file_path)67 std::string GetLibrariesString(const std::string& library_file_path) {
68 auto library_list_result = GetLibrariesFromFile(library_file_path);
69 if (library_list_result.ok()) {
70 return android::base::Join(*library_list_result, ':');
71 } else {
72 // Consider unavailable library file as empty
73 LOG(WARNING) << library_list_result.error();
74 return "";
75 }
76 }
77
GetPublicLibrariesString(const std::string & library_file_path,const std::string & private_library_file_path)78 std::string GetPublicLibrariesString(
79 const std::string& library_file_path,
80 const std::string& private_library_file_path) {
81 auto library_list = GetLibrariesFromFile(library_file_path);
82 auto private_library_list = GetLibrariesFromFile(private_library_file_path);
83
84 if (!library_list.ok()) {
85 // Consider unavailable library file as empty
86 LOG(WARNING) << library_list.error();
87 return "";
88 }
89
90 if (!private_library_list.ok()) {
91 // No private library found. All libraries are public
92 LOG(WARNING) << private_library_list.error();
93 return android::base::Join(*library_list, ':');
94 }
95
96 LibraryList public_library_list;
97
98 std::set_difference(
99 library_list->begin(),
100 library_list->end(),
101 private_library_list->begin(),
102 private_library_list->end(),
103 std::inserter(public_library_list, public_library_list.begin()));
104
105 return android::base::Join(public_library_list, ':');
106 }
107
GetPrivateLibrariesString(const std::string & library_file_path,const std::string & private_library_file_path)108 std::string GetPrivateLibrariesString(
109 const std::string& library_file_path,
110 const std::string& private_library_file_path) {
111 auto library_list = GetLibrariesFromFile(library_file_path);
112 auto private_library_list = GetLibrariesFromFile(private_library_file_path);
113
114 if (!library_list.ok()) {
115 // Consider unavailable library file as empty
116 LOG(WARNING) << library_list.error();
117 return "";
118 }
119
120 if (!private_library_list.ok()) {
121 // No private library found. All libraries are public
122 LOG(WARNING) << private_library_list.error();
123 return "";
124 }
125
126 LibraryList private_only_library_list;
127
128 std::set_intersection(library_list->begin(),
129 library_list->end(),
130 private_library_list->begin(),
131 private_library_list->end(),
132 std::inserter(private_only_library_list,
133 private_only_library_list.begin()));
134
135 return android::base::Join(private_only_library_list, ':');
136 }
137 } // namespace generator
138 } // namespace linkerconfig
139 } // namespace android
140