Unverified Commit 5f2d4be7 authored by Tommaso Tocci's avatar Tommaso Tocci
Browse files

intercept openat

parent f8c2b1b6

ifs/include/preload/passthrough.hpp

+1 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
extern void* libc;



extern void* libc_open;

extern void* libc_openat;



extern void* libc_fopen;

extern void* libc_fopen64;

ifs/src/preload/intcp_functions.cpp

+42 −0
Original line number Diff line number Diff line
@@ -48,6 +48,48 @@ int open64(const char* path, int flags, ...) { 
    return open(path, flags | O_LARGEFILE, mode);

}



int openat(int dirfd, const char *path, int flags, ...) {

    init_passthrough_if_needed();



    mode_t mode = 0;

    if (flags & O_CREAT) {

        va_list vl;

        va_start(vl, flags);

        mode = static_cast<mode_t>(va_arg(vl, int));

        va_end(vl);

    }



    if(CTX->initialized()) {

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

        std::string rel_path(path);

        if (CTX->relativize_path(rel_path)) {

            return adafs_open(rel_path, mode, flags);

        }



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

            CTX->log()->error("{}() called with relative path: NOT SUPPORTED", __func__);

            errno = ENOTSUP;

            return -1;

        }

    }



    return (reinterpret_cast<decltype(&openat)>(libc_openat))(dirfd, path, flags, mode);

}



int openat64(int dirfd, const char *path, int flags, ...) {

    init_passthrough_if_needed();



    mode_t mode = 0;

    if (flags & O_CREAT) {

        va_list vl;

        va_start(vl, flags);

        mode = static_cast<mode_t>(va_arg(vl, int));

        va_end(vl);

    }



    return openat(dirfd, path, flags | O_LARGEFILE, mode);

}



/******  FILE OPS  ******/



inline int file_to_fd(const FILE* f){

ifs/src/preload/passthrough.cpp

+2 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ static pthread_once_t init_lib_thread = PTHREAD_ONCE_INIT; 
void* libc;



void* libc_open;

void* libc_openat;



void* libc_fopen;

void* libc_fopen64;
@@ -91,6 +92,7 @@ void init_passthrough_() { 
    }



    libc_open = dlsym(libc, "open");

    libc_openat = dlsym(libc, "openat");



    libc_fopen = dlsym(libc, "fopen");

    libc_fopen64 = dlsym(libc, "fopen64");