C ++检查路径是否在给定目录之外 [英] C++ check if path is outside a given directory

问题描述

检查给定路径A是否在另一路径B之外的最简单方法是什么?即:确定 foo/../../bar/是否在 foo/之外.

What is the simplest way to check if a given path A is outside another path B? I.e.: determine whether foo/../../bar/ is outside foo/.

推荐答案

类似的东西应该可以工作.另外请注意，这两个路径都应该存在.

Something like this should work. Also note that both paths should exist.

#include <filesystem>
#include <algorithm>
#include <iterator>
#include <cassert>

bool isSafePath(const std::filesystem::path &root, const std::filesystem::path &child) {
    auto const normRoot = std::filesystem::canonical(root);
    auto const normChild = std::filesystem::canonical(child);
    
    auto itr = std::search(normChild.begin(), normChild.end(), 
                           normRoot.begin(), normRoot.end());
    
    return itr == normChild.begin();
}

int main(int argc, char **argv)
{
    assert(isSafePath("www/root/nvevg", "www/root/nvevg/../../../www/root/nvevg/index.html"));
    assert(isSafePath("www/root/nvevg", "www/root/nvevg/../../../www/root/nvevg"));
    assert(isSafePath("/home/nvevg/projects/davshare/apps/", "/home/nvevg/projects/davshare/apps/../apps/CMakeLists.txt"));
    
    assert(not isSafePath("/home/nvevg/projects/davshare/apps/", "/home/nvevg/projects/davshare/apps/../../../../../etc/shadow"));
    assert(not isSafePath("/home/nvevg/projects/davshare/apps/", "/home/nvevg/projects/davshare/apps/../CMakeLists.txt"));
    assert(not isSafePath("www/root/nvevg", "www/root/nvevg/../../../www/root/"));
    assert(not isSafePath("www/root/nvevg", "www/root/nvevg/../../../www/"));
    assert(not isSafePath("www/root/nvevg", "www/root/nvevg/../../../../../../../../../etc/fstab"));
    
    return 0;
}

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