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1 /*
2  * Copyright (C) 2017 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 "rlimit_parser.h"
18 
19 #include <android-base/parseint.h>
20 #include <android-base/strings.h>
21 
22 using android::base::EqualsIgnoreCase;
23 using android::base::ParseInt;
24 using android::base::ParseUint;
25 using android::base::StartsWith;
26 
27 namespace android {
28 namespace init {
29 
30 // Builtins and service definitions both have their arguments start at 1 and finish at 3.
ParseRlimit(const std::vector<std::string> & args)31 Result<std::pair<int, rlimit>> ParseRlimit(const std::vector<std::string>& args) {
32     static const std::vector<std::pair<const char*, int>> text_to_resources = {
33         {"cpu", 0},       {"fsize", 1}, {"data", 2},    {"stack", 3},
34         {"core", 4},      {"rss", 5},   {"nproc", 6},   {"nofile", 7},
35         {"memlock", 8},   {"as", 9},    {"locks", 10},  {"sigpending", 11},
36         {"msgqueue", 12}, {"nice", 13}, {"rtprio", 14}, {"rttime", 15},
37     };
38 
39     int resource;
40 
41     if (ParseInt(args[1], &resource)) {
42         if (resource >= RLIM_NLIMITS) {
43             return Error() << "Resource '" << args[1] << "' over the maximum resource value '"
44                            << RLIM_NLIMITS << "'";
45         } else if (resource < 0) {
46             return Error() << "Resource '" << args[1] << "' below the minimum resource value '0'";
47         }
48     } else {
49         std::string resource_string;
50         if (StartsWith(args[1], "RLIM_")) {
51             resource_string = args[1].substr(5);
52         } else {
53             resource_string = args[1];
54         }
55 
56         auto it = std::find_if(text_to_resources.begin(), text_to_resources.end(),
57                                [&resource_string](const auto& entry) {
58                                    return EqualsIgnoreCase(resource_string, entry.first);
59                                });
60         if (it == text_to_resources.end()) {
61             return Error() << "Could not parse resource '" << args[1] << "'";
62         }
63 
64         resource = it->second;
65     }
66 
67     rlimit limit;
68     if (args[2] == "-1" || args[2] == "unlimited") {
69         limit.rlim_cur = RLIM_INFINITY;
70     } else if (!ParseUint(args[2], &limit.rlim_cur)) {
71         return Error() << "Could not parse soft limit '" << args[2] << "'";
72     }
73 
74     if (args[3] == "-1" || args[3] == "unlimited") {
75         limit.rlim_max = RLIM_INFINITY;
76     } else if (!ParseUint(args[3], &limit.rlim_max)) {
77         return Error() << "Could not parse hard limit '" << args[3] << "'";
78     }
79 
80     return std::pair{resource, limit};
81 }
82 
83 }  // namespace init
84 }  // namespace android
85