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      1 /*
      2  * Copyright (C) 2014 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 "UidRanges.h"
     18 
     19 #include "NetdConstants.h"
     20 
     21 #include <stdlib.h>
     22 
     23 bool UidRanges::hasUid(uid_t uid) const {
     24     auto iter = std::lower_bound(mRanges.begin(), mRanges.end(), Range(uid, uid));
     25     return (iter != mRanges.end() && iter->first == uid) ||
     26            (iter != mRanges.begin() && (--iter)->second >= uid);
     27 }
     28 
     29 const std::vector<UidRanges::Range>& UidRanges::getRanges() const {
     30     return mRanges;
     31 }
     32 
     33 bool UidRanges::parseFrom(int argc, char* argv[]) {
     34     mRanges.clear();
     35     for (int i = 0; i < argc; ++i) {
     36         if (!*argv[i]) {
     37             // The UID string is empty.
     38             return false;
     39         }
     40         char* endPtr;
     41         uid_t uidStart = strtoul(argv[i], &endPtr, 0);
     42         uid_t uidEnd;
     43         if (!*endPtr) {
     44             // Found a single UID. The range contains just the one UID.
     45             uidEnd = uidStart;
     46         } else if (*endPtr == '-') {
     47             if (!*++endPtr) {
     48                 // Unexpected end of string.
     49                 return false;
     50             }
     51             uidEnd = strtoul(endPtr, &endPtr, 0);
     52             if (*endPtr) {
     53                 // Illegal trailing chars.
     54                 return false;
     55             }
     56             if (uidEnd < uidStart) {
     57                 // Invalid order.
     58                 return false;
     59             }
     60         } else {
     61             // Not a single uid, not a range. Found some other illegal char.
     62             return false;
     63         }
     64         if (uidStart == INVALID_UID || uidEnd == INVALID_UID) {
     65             // Invalid UIDs.
     66             return false;
     67         }
     68         mRanges.push_back(Range(uidStart, uidEnd));
     69     }
     70     std::sort(mRanges.begin(), mRanges.end());
     71     return true;
     72 }
     73 
     74 void UidRanges::add(const UidRanges& other) {
     75     auto middle = mRanges.insert(mRanges.end(), other.mRanges.begin(), other.mRanges.end());
     76     std::inplace_merge(mRanges.begin(), middle, mRanges.end());
     77 }
     78 
     79 void UidRanges::remove(const UidRanges& other) {
     80     auto end = std::set_difference(mRanges.begin(), mRanges.end(), other.mRanges.begin(),
     81                                    other.mRanges.end(), mRanges.begin());
     82     mRanges.erase(end, mRanges.end());
     83 }
     84