Unverified Commit 65f6327b authored by Tommaso Tocci's avatar Tommaso Tocci
Browse files

intercept fopen

parent af8c9be9

ifs/include/preload/passthrough.hpp

+2 −2
Original line number Diff line number Diff line
@@ -9,8 +9,8 @@ 
extern void* libc;



extern void* libc_open;

extern void* libc_fopen; // XXX Does not work with streaming pointers. If used will block forever

extern void* libc_fopen64; // XXX Does not work with streaming pointers. If used will block forever

extern void* libc_fopen;

extern void* libc_fopen64;



extern void* libc_mkdir;

extern void* libc_mkdirat;

ifs/src/preload/intcp_functions.cpp

+27 −13
Original line number Diff line number Diff line
@@ -52,19 +52,33 @@ int open64(const char* path, int flags, ...) { 
    return open(path, flags | O_LARGEFILE, mode);

}



//// TODO This function somehow always blocks forever if one puts anything between the paththru...

//FILE* fopen(const char* path, const char* mode) {

////    init_passthrough_if_needed();

////    DAEMON_DEBUG(debug_fd, "fopen called with path %s\n", path);

//    return (reinterpret_cast<decltype(&fopen)>(libc_fopen))(path, mode);

//}



//// TODO This function somehow always blocks forever if one puts anything between the paththru...

//FILE* fopen64(const char* path, const char* mode) {

////    init_passthrough_if_needed();

////    DAEMON_DEBUG(debug_fd, "fopen64 called with path %s\n", path);

//    return (reinterpret_cast<decltype(&fopen)>(libc_fopen))(path, mode);

//}

FILE* fopen(const char* path, const char* mode) {

    init_passthrough_if_needed();

    if(CTX->initialized()) {

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

        std::string rel_path(path);

        if (CTX->relativize_path(rel_path)) {

            CTX->log()->error("{}() NOT SUPPORTED", __func__);

            errno = ENOTSUP;

            return nullptr;

        }

    }

    return (reinterpret_cast<decltype(&fopen)>(libc_fopen))(path, mode);

}



FILE* fopen64(const char* path, const char* mode) {

    init_passthrough_if_needed();

    if(CTX->initialized()) {

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

        std::string rel_path(path);

        if (CTX->relativize_path(rel_path)) {

            CTX->log()->error("{}() NOT SUPPORTED", __func__);

            errno = ENOTSUP;

            return nullptr;

        }

    }

    return (reinterpret_cast<decltype(&fopen)>(libc_fopen64))(path, mode);

}



#undef creat

ifs/src/preload/passthrough.cpp

+2 −2
Original line number Diff line number Diff line
@@ -76,8 +76,8 @@ void init_passthrough_() { 
    }



    libc_open = dlsym(libc, "open");

//    libc_fopen = dlsym(libc, "fopen");

//    libc_fopen64 = dlsym(libc, "fopen64");

    libc_fopen = dlsym(libc, "fopen");

    libc_fopen64 = dlsym(libc, "fopen64");

    libc_mkdir = dlsym(libc, "mkdir");

    libc_mkdirat = dlsym(libc, "mkdirat");