Пример #1
0
static int setup_xenconsoled_pty(libxl__egc *egc, libxl__bootloader_state *bl,
                                 char *slave_path, size_t slave_path_len)
{
    STATE_AO_GC(bl->ao);
    struct termios termattr;
    int r, rc;
    int slave = libxl__carefd_fd(bl->ptys[1].slave);
    int master = libxl__carefd_fd(bl->ptys[1].master);

    r = ttyname_r(slave, slave_path, slave_path_len);
    if (r == -1) {
        LOGE(ERROR,"ttyname_r failed");
        rc = ERROR_FAIL;
        goto out;
    }

    /*
     * On Solaris, the pty master side will get cranky if we try
     * to write to it while there is no slave. To work around this,
     * keep the slave descriptor open until we're done. Set it
     * to raw terminal parameters, otherwise it will echo back
     * characters, which will confuse the I/O loop below.
     * Furthermore, a raw master pty device has no terminal
     * semantics on Solaris, so don't try to set any attributes
     * for it.
     */
    tcgetattr(master, &termattr);
    cfmakeraw(&termattr);
    tcsetattr(master, TCSANOW, &termattr);

    return 0;

out:
    return rc;
}
Пример #2
0
void libxl__stream_read_start(libxl__egc *egc,
                              libxl__stream_read_state *stream)
{
    libxl__datacopier_state *dc = &stream->dc;
    STATE_AO_GC(stream->ao);
    int rc = 0;

    libxl__stream_read_init(stream);

    stream->running = true;
    stream->phase   = SRS_PHASE_NORMAL;

    if (stream->legacy) {
        /* Convert the legacy stream. */
        libxl__conversion_helper_state *chs = &stream->chs;

        chs->legacy_fd = stream->fd;
        chs->hvm =
            (stream->dcs->guest_config->b_info.type == LIBXL_DOMAIN_TYPE_HVM);
        chs->completion_callback = conversion_done;

        rc = libxl__convert_legacy_stream(egc, &stream->chs);

        if (rc) {
            LOG(ERROR, "Failed to start the legacy stream conversion helper");
            goto err;
        }

        assert(stream->chs.v2_carefd);
        stream->fd = libxl__carefd_fd(stream->chs.v2_carefd);
        stream->dcs->libxc_fd = stream->fd;
    }
    /* stream->fd is now a v2 stream. */

    dc->ao       = stream->ao;
    dc->copywhat = "restore v2 stream";
    dc->readfd   = stream->fd;
    dc->writefd  = -1;

    /* Start reading the stream header. */
    rc = setup_read(stream, "stream header",
                    &stream->hdr, sizeof(stream->hdr),
                    stream_header_done);
    if (rc)
        goto err;

    assert(!rc);
    return;

 err:
    assert(rc);
    stream_complete(egc, stream, rc);
}
Пример #3
0
void libxl__srm_callout_sendreply(int r, void *user)
{
    libxl__save_helper_state *shs = user;
    libxl__egc *egc = shs->egc;
    STATE_AO_GC(shs->ao);
    int errnoval;

    errnoval = libxl_write_exactly(CTX, libxl__carefd_fd(shs->pipes[0]),
                                   &r, sizeof(r), shs->stdin_what,
                                   "callback return value");
    if (errnoval)
        helper_failed(egc, shs, ERROR_FAIL);
}
Пример #4
0
static void bootloader_gotptys(libxl__egc *egc, libxl__openpty_state *op)
{
    libxl__bootloader_state *bl = CONTAINER_OF(op, *bl, openpty);
    STATE_AO_GC(bl->ao);
    int rc, r;
    char *const env[] = { "TERM", "vt100", NULL };

    if (bl->openpty.rc) {
        rc = bl->openpty.rc;
        goto out;
    }

    /*
     * We need to present the bootloader's tty as a pty slave that xenconsole
     * can access.  Since the bootloader itself needs a pty slave,
     * we end up with a connection like this:
     *
     * xenconsole -- (slave pty1 master) <-> (master pty2 slave) -- bootloader
     *
     * where we copy characters between the two master fds, as well as
     * listening on the bootloader's fifo for the results.
     */

    char *dom_console_xs_path;
    char dom_console_slave_tty_path[PATH_MAX];
    rc = setup_xenconsoled_pty(egc, bl,
                               &dom_console_slave_tty_path[0],
                               sizeof(dom_console_slave_tty_path));
    if (rc) goto out;

    char *dompath = libxl__xs_get_dompath(gc, bl->domid);
    if (!dompath) {
        rc = ERROR_FAIL;
        goto out;
    }

    dom_console_xs_path = GCSPRINTF("%s/console/tty", dompath);

    rc = libxl__xs_write(gc, XBT_NULL, dom_console_xs_path, "%s",
                         dom_console_slave_tty_path);
    if (rc) {
        LOGE(ERROR,"xs write console path %s := %s failed",
             dom_console_xs_path, dom_console_slave_tty_path);
        rc = ERROR_FAIL;
        goto out;
    }

    bl->deathcheck.what = "stopping bootloader";
    bl->deathcheck.domid = bl->domid;
    bl->deathcheck.callback = bootloader_domaindeath;
    rc = libxl__domaindeathcheck_start(gc, &bl->deathcheck);
    if (rc) goto out;

    if (bl->console_available)
        bl->console_available(egc, bl);

    int bootloader_master = libxl__carefd_fd(bl->ptys[0].master);
    int xenconsole_master = libxl__carefd_fd(bl->ptys[1].master);

    libxl_fd_set_nonblock(CTX, bootloader_master, 1);
    libxl_fd_set_nonblock(CTX, xenconsole_master, 1);

    bl->keystrokes.writefd   = bl->display.readfd   = bootloader_master;
    bl->keystrokes.writewhat = bl->display.readwhat = "bootloader pty";

    bl->keystrokes.readfd   = bl->display.writefd   = xenconsole_master;
    bl->keystrokes.readwhat = bl->display.writewhat = "xenconsole client pty";

    bl->keystrokes.ao = ao;
    bl->keystrokes.maxsz = BOOTLOADER_BUF_OUT;
    bl->keystrokes.copywhat =
        GCSPRINTF("bootloader input for domain %"PRIu32, bl->domid);
    bl->keystrokes.callback =         bootloader_keystrokes_copyfail;
    bl->keystrokes.callback_pollhup = bootloader_keystrokes_copyfail;
    /* pollhup gets called with errnoval==-1 which is not otherwise
     * possible since errnos are nonnegative, so it's unambiguous */
    rc = libxl__datacopier_start(&bl->keystrokes);
    if (rc) goto out;

    bl->display.ao = ao;
    bl->display.maxsz = BOOTLOADER_BUF_IN;
    bl->display.copywhat =
        GCSPRINTF("bootloader output for domain %"PRIu32, bl->domid);
    bl->display.callback =         bootloader_display_copyfail;
    bl->display.callback_pollhup = bootloader_display_copyfail;
    rc = libxl__datacopier_start(&bl->display);
    if (rc) goto out;

    LOG(DEBUG, "executing bootloader: %s", bl->args[0]);
    for (const char **blarg = bl->args;
            *blarg;
            blarg++)
        LOG(DEBUG, "  bootloader arg: %s", *blarg);

    struct termios termattr;

    pid_t pid = libxl__ev_child_fork(gc, &bl->child, bootloader_finished);
    if (pid == -1) {
        rc = ERROR_FAIL;
        goto out;
    }

    if (!pid) {
        /* child */
        r = login_tty(libxl__carefd_fd(bl->ptys[0].slave));
        if (r) {
            LOGE(ERROR, "login_tty failed");
            exit(-1);
        }
        libxl__exec(gc, -1, -1, -1, bl->args[0], (char **) bl->args, env);
        exit(-1);
    }

    /* parent */

    /*
     * On Solaris, the master pty side does not have terminal semantics,
     * so don't try to set any attributes, as it will fail.
     */
#if !defined(__sun__)
    tcgetattr(bootloader_master, &termattr);
    cfmakeraw(&termattr);
    tcsetattr(bootloader_master, TCSANOW, &termattr);
#endif

    return;

out:
    bootloader_callback(egc, bl, rc);
}
Пример #5
0
static void run_helper(libxl__egc *egc, libxl__save_helper_state *shs,
                       const char *mode_arg, int stream_fd,
                       const int *preserve_fds, int num_preserve_fds,
                       const unsigned long *argnums, int num_argnums)
{
    STATE_AO_GC(shs->ao);
    const char *args[4 + num_argnums];
    const char **arg = args;
    int i, rc;

    /* Resources we must free */
    libxl__carefd *childs_pipes[2] = { 0,0 };

    /* Convenience aliases */
    const uint32_t domid = shs->domid;

    shs->rc = 0;
    shs->completed = 0;
    shs->pipes[0] = shs->pipes[1] = 0;
    libxl__ev_fd_init(&shs->readable);
    libxl__ev_child_init(&shs->child);

    shs->stdin_what = GCSPRINTF("domain %"PRIu32" save/restore helper"
                                " stdin pipe", domid);
    shs->stdout_what = GCSPRINTF("domain %"PRIu32" save/restore helper"
                                 " stdout pipe", domid);

    *arg++ = getenv("LIBXL_SAVE_HELPER") ?: PRIVATE_BINDIR "/" "libxl-save-helper";
    *arg++ = mode_arg;
    const char **stream_fd_arg = arg++;
    for (i=0; i<num_argnums; i++)
        *arg++ = GCSPRINTF("%lu", argnums[i]);
    *arg++ = 0;
    assert(arg == args + ARRAY_SIZE(args));

    libxl__carefd_begin();
    int childfd;
    for (childfd=0; childfd<2; childfd++) {
        /* Setting up the pipe for the child's fd childfd */
        int fds[2];
        if (libxl_pipe(CTX,fds)) {
            rc = ERROR_FAIL;
            libxl__carefd_unlock();
            goto out;
        }
        int childs_end = childfd==0 ? 0 /*read*/  : 1 /*write*/;
        int our_end    = childfd==0 ? 1 /*write*/ : 0 /*read*/;
        childs_pipes[childfd] = libxl__carefd_record(CTX, fds[childs_end]);
        shs->pipes[childfd] =   libxl__carefd_record(CTX, fds[our_end]);
    }
    libxl__carefd_unlock();

    pid_t pid = libxl__ev_child_fork(gc, &shs->child, helper_exited);
    if (!pid) {
        if (stream_fd <= 2) {
            stream_fd = dup(stream_fd);
            if (stream_fd < 0) {
                LOGE(ERROR,"dup migration stream fd");
                exit(-1);
            }
        }
        libxl_fd_set_cloexec(CTX, stream_fd, 0);
        *stream_fd_arg = GCSPRINTF("%d", stream_fd);

        for (i=0; i<num_preserve_fds; i++)
            if (preserve_fds[i] >= 0) {
                assert(preserve_fds[i] > 2);
                libxl_fd_set_cloexec(CTX, preserve_fds[i], 0);
            }

        libxl__exec(gc,
                    libxl__carefd_fd(childs_pipes[0]),
                    libxl__carefd_fd(childs_pipes[1]),
                    -1,
                    args[0], (char**)args, 0);
    }

    libxl__carefd_close(childs_pipes[0]);
    libxl__carefd_close(childs_pipes[1]);

    rc = libxl__ev_fd_register(gc, &shs->readable, helper_stdout_readable,
                               libxl__carefd_fd(shs->pipes[1]), POLLIN|POLLPRI);
    if (rc) goto out;
    return;

 out:
    libxl__carefd_close(childs_pipes[0]);
    libxl__carefd_close(childs_pipes[1]);
    helper_failed(egc, shs, rc);;
}