Unverified Commit c294d9e0 authored by Tommaso Tocci's avatar Tommaso Tocci
Browse files

intercept lstat, fstat

parent b0fa8e12

include/client/hooks.hpp

+2 −0
Original line number Diff line number Diff line
@@ -20,6 +20,8 @@ 
int hook_openat(int dirfd, const char *cpath, int flags, mode_t mode);

int hook_close(int fd);

int hook_stat(const char* path, struct stat* buf);

int hook_lstat(const char* path, struct stat* buf);

int hook_fstat(unsigned int, struct stat* buf);

int hook_read(int fd, void* buf, size_t count);

int hook_write(int fd, void* buf, size_t count);

int hook_unlink(const char* path);

src/client/hooks.cpp

+18 −0
Original line number Diff line number Diff line
@@ -73,6 +73,24 @@ int hook_stat(const char* path, struct stat* buf) { 
    return syscall_no_intercept(SYS_stat, rel_path.c_str(), buf);

}



int hook_lstat(const char* path, struct stat* buf) {

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

    std::string rel_path;

    if (CTX->relativize_path(path, rel_path)) {

        return with_errno(adafs_stat(rel_path, buf));

    }

    return syscall_no_intercept(SYS_lstat, rel_path.c_str(), buf);

}



int hook_fstat(unsigned int fd, struct stat* buf) {

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

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

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

        return with_errno(adafs_stat(path, buf));

    }

    return syscall_no_intercept(SYS_fstat, fd, buf);

}



int hook_read(int fd, void* buf, size_t count) {

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

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

src/client/intercept.cpp

+10 −0
Original line number Diff line number Diff line
@@ -59,6 +59,16 @@ static inline int hook(long syscall_number, 
                            reinterpret_cast<struct stat*>(arg1));

        break;



    case SYS_lstat:

        *result = hook_lstat(reinterpret_cast<char*>(arg0),

                             reinterpret_cast<struct stat*>(arg1));

        break;



    case SYS_fstat:

        *result = hook_fstat(static_cast<int>(arg0),

                            reinterpret_cast<struct stat*>(arg1));

        break;



    case SYS_read:

        *result = hook_read(static_cast<int>(arg0),

                            reinterpret_cast<void*>(arg1),