Verified Commit 7eeb58d4 authored by Tommaso Tocci's avatar Tommaso Tocci
Browse files

intercept fdopendir

parent 80c1e9b0

ifs/include/preload/passthrough.hpp

+1 −0
Original line number Diff line number Diff line
@@ -73,6 +73,7 @@ extern void* libc_dup2; 
extern void* libc_dup3;



extern void* libc_opendir;

extern void* libc_fdopendir;

extern void* libc_readdir;

extern void* libc_closedir;

ifs/src/preload/intcp_functions.cpp

+18 −0
Original line number Diff line number Diff line
@@ -836,6 +836,24 @@ DIR* opendir(const char* path){ 
    return (reinterpret_cast<decltype(&opendir)>(libc_opendir))(path);

}



DIR* fdopendir(int fd){

    init_passthrough_if_needed();

    if(CTX->initialized()) {

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

        if (CTX->file_map()->exist(fd)) {

            auto open_file = CTX->file_map()->get(fd);

            auto open_dir = static_pointer_cast<OpenDir>(open_file);

            if(!open_dir){

                //Cast did not succeeded: open_file is a regular file

                errno = EBADF;

                return nullptr;

            }

            return fd_to_dirp(fd);

        }

    }

    return (reinterpret_cast<decltype(&fdopendir)>(libc_fdopendir))(fd);

}



struct dirent* intcp_readdir(DIR* dirp){

    init_passthrough_if_needed();

    if(CTX->initialized()) {

ifs/src/preload/passthrough.cpp

+2 −0
Original line number Diff line number Diff line
@@ -78,6 +78,7 @@ void* libc_dup2; 
void* libc_dup3;



void* libc_opendir;

void* libc_fdopendir;

void* libc_readdir;

void* libc_closedir;
@@ -159,6 +160,7 @@ void init_passthrough_() { 
    libc_dup3 = dlsym(libc, "dup3");



    libc_opendir = dlsym(libc, "opendir");

    libc_fdopendir = dlsym(libc, "fdopendir");

    libc_readdir = dlsym(libc, "readdir");

    libc_closedir = dlsym(libc, "closedir");