Unverified Commit 48592d5f authored by Tommaso Tocci's avatar Tommaso Tocci
Browse files

intercept fstat

parent 5c3f5cf0

include/client/hooks.hpp

+2 −1
Original line number Diff line number Diff line
@@ -21,7 +21,8 @@ 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_fstat(unsigned int fd, struct stat* buf);

int hook_fstatat(int dirfd, const char * cpath, struct stat * buf, int flags);

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

int hook_pread(unsigned int fd, char * buf, size_t count, loff_t pos);

int hook_write(unsigned int fd, const char * buf, size_t count);

src/client/hooks.cpp

+29 −0
Original line number Diff line number Diff line
@@ -91,6 +91,35 @@ int hook_fstat(unsigned int fd, struct stat* buf) { 
    return syscall_no_intercept(SYS_fstat, fd, buf);

}



int hook_fstatat(int dirfd, const char * cpath, struct stat * buf, int flags) {

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



    if(flags & AT_EMPTY_PATH) {

        CTX->log()->error("{}() AT_EMPTY_PATH flag not supported", __func__);

        return -ENOTSUP;

    }



    std::string resolved;

    auto rstatus = CTX->relativize_fd_path(dirfd, cpath, resolved);

    switch(rstatus) {

        case RelativizeStatus::fd_unknown:

            return syscall_no_intercept(SYS_newfstatat, dirfd, cpath, buf, flags);



        case RelativizeStatus::external:

            return syscall_no_intercept(SYS_newfstatat, dirfd, resolved.c_str(), buf, flags);



        case RelativizeStatus::fd_not_a_dir:

            return -ENOTDIR;



        case RelativizeStatus::internal:

            return with_errno(adafs_stat(resolved, buf));



        default:

            CTX->log()->error("{}() relativize status unknown: {}", __func__);

            return -EINVAL;

    }

}



int hook_read(unsigned 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

+7 −0
Original line number Diff line number Diff line
@@ -69,6 +69,13 @@ static inline int hook(long syscall_number, 
                            reinterpret_cast<struct stat*>(arg1));

        break;



    case SYS_newfstatat:

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

                              reinterpret_cast<const char*>(arg1),

                              reinterpret_cast<struct stat *>(arg2),

                              static_cast<int>(arg3));

        break;



    case SYS_read:

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

                            reinterpret_cast<void*>(arg1),