Verified Commit 5c8a37d4 authored by Tommaso Tocci's avatar Tommaso Tocci
Browse files

Intercept chdir

parent 0399fb40

ifs/include/preload/passthrough.hpp

+2 −0
Original line number Diff line number Diff line
@@ -63,6 +63,8 @@ extern void* libc_opendir; 
extern void* libc_readdir;

extern void* libc_closedir;



extern void* libc_chdir;



void init_passthrough_if_needed();



#endif //IFS_PASSTHROUGH_HPP

ifs/src/preload/intcp_functions.cpp

+13 −1
Original line number Diff line number Diff line
@@ -498,3 +498,15 @@ int intcp_closedir(DIR* dirp) { 
    }

    return (reinterpret_cast<decltype(&closedir)>(libc_closedir))(dirp);

}



int chdir(const char* path){

    init_passthrough_if_needed();

    CTX->log()->trace("{}() called with path {}", __func__, path);

    std::string rel_path(path);

    if (CTX->relativize_path(rel_path)) {

        CTX->log()->error("Attempt to chdir into adafs namespace: NOT SUPPORTED", __func__, path);

        errno = ENOTSUP;

        return -1;

    }

    return (reinterpret_cast<decltype(&chdir)>(libc_chdir))(path);

}

ifs/src/preload/passthrough.cpp

+5 −0
Original line number Diff line number Diff line
@@ -67,6 +67,9 @@ void* libc_opendir; 
void* libc_readdir;

void* libc_closedir;



void* libc_chdir;





void init_passthrough_() {

    libc = dlopen("libc.so.6", RTLD_LAZY);

    if(libc == nullptr){
@@ -126,6 +129,8 @@ void init_passthrough_() { 
    libc_readdir = dlsym(libc, "readdir");

    libc_closedir = dlsym(libc, "closedir");



    libc_chdir = dlsym(libc, "chdir");



    fs_config = std::make_shared<struct FsConfig>();



    //set the spdlogger and initialize it with spdlog