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67 lines
2.1 KiB
C++
67 lines
2.1 KiB
C++
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "sandboxed_api/sandbox2/util/maps_parser.h"
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#include <cstdio>
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#include <cstring>
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#include <string>
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#include <vector>
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#include "absl/status/status.h"
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#include "absl/status/statusor.h"
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#include "absl/strings/str_split.h"
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namespace sandbox2 {
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absl::StatusOr<std::vector<MapsEntry>> ParseProcMaps(
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const std::string& contents) {
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// Note: The format string
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// https://github.com/torvalds/linux/blob/v4.14/fs/proc/task_mmu.c#L289
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// changed to a non-format string implementation
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// (show_vma_header_prefix()).
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static constexpr char kFormatString[] =
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"%lx-%lx %c%c%c%c %lx %x:%x %lu %1023s";
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static constexpr size_t kFilepathLength = 1023;
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std::vector<std::string> lines =
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absl::StrSplit(contents, '\n', absl::SkipEmpty());
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std::vector<MapsEntry> entries;
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for (const auto& line : lines) {
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MapsEntry entry{};
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char r, w, x, s;
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entry.path.resize(kFilepathLength + 1, '\0');
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int n_matches = sscanf(
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line.c_str(), kFormatString, &entry.start, &entry.end, &r, &w, &x, &s,
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&entry.pgoff, &entry.major, &entry.minor, &entry.inode, &entry.path[0]);
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// Some lines do not have a filename.
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if (n_matches == 10) {
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entry.path.clear();
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} else if (n_matches == 11) {
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entry.path.resize(strlen(entry.path.c_str()));
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} else {
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return absl::FailedPreconditionError("Invalid format");
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}
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entry.is_readable = r == 'r';
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entry.is_writable = w == 'w';
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entry.is_executable = x == 'x';
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entry.is_shared = s == 's';
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entries.push_back(entry);
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}
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return entries;
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}
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} // namespace sandbox2
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