Verified Commit b6369f46 authored by Tommaso Tocci's avatar Tommaso Tocci
Browse files

intercept truncate, ftruncate

parent 92c822c2

ifs/include/preload/hooks.hpp

+2 −0
Original line number Diff line number Diff line
@@ -20,6 +20,8 @@ int hook_pwritev(unsigned long fd, const struct iovec * iov, unsigned long iovcn 
int hook_unlinkat(int dirfd, const char * cpath, int flags);

int hook_access(const char* path, int mask);

int hook_lseek(unsigned int fd, off_t offset, unsigned int whence);

int hook_truncate(const char *path, long length);

int hook_ftruncate(unsigned int fd, unsigned long length);

int hook_dup(unsigned int fd);

int hook_dup2(unsigned int oldfd, unsigned int newfd);

int hook_dup3(unsigned int oldfd, unsigned int newfd, int flags);

ifs/src/preload/hooks.cpp

+19 −0
Original line number Diff line number Diff line
@@ -224,6 +224,24 @@ int hook_lseek(unsigned int fd, off_t offset, unsigned int whence) { 
   return syscall_no_intercept(SYS_lseek, fd, offset, whence);

}



int hook_truncate(const char* path, long length) {

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

    std::string rel_path;

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

        return with_errno(adafs_truncate(rel_path, length));

    }

    return syscall_no_intercept(SYS_truncate, rel_path.c_str(), length);

}



int hook_ftruncate(unsigned int fd, unsigned long length) {

    CTX->log()->trace("{}() called  [fd: {}, offset: {}]", __func__, fd, length);

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

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

        return with_errno(adafs_truncate(path, length));

    }

    return syscall_no_intercept(SYS_ftruncate, fd, length);

}



int hook_dup(unsigned int fd) {

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

    if (CTX->file_map()->exist(fd)) {
@@ -283,6 +301,7 @@ int hook_mkdirat(int dirfd, const char * cpath, mode_t mode) { 
    }

}



    std::string resolved;

int hook_chdir(const char * path) {

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

    std::string rel_path;

ifs/src/preload/intercept.cpp

+10 −0
Original line number Diff line number Diff line
@@ -125,6 +125,16 @@ static inline int hook(long syscall_number, 
                             static_cast<unsigned int>(arg2));

        break;



    case SYS_truncate:

        *result = hook_truncate(reinterpret_cast<const char*>(arg0),

                                static_cast<long>(arg1));

        break;



    case SYS_ftruncate:

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

                                 static_cast<unsigned long>(arg1));

        break;



    case SYS_dup:

        *result = hook_dup(static_cast<unsigned int>(arg0));

        break;