72c0a2c255
This ports a lot of manual code over to sigprocmask_many() and friends. Also, we now consistly check for sigprocmask() failures with assert_se(), since the call cannot realistically fail unless there's a programming error. Also encloses a few sd_event_add_signal() calls with (void) when we ignore the return values for it knowingly.
489 lines
15 KiB
C
489 lines
15 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright (C) 2014 David Herrmann <dh.herrmann@gmail.com>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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/*
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* Event Catenation
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* The evcat tool catenates input events of all requested devices and prints
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* them to standard-output. It's only meant for debugging of input-related
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* problems.
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*/
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#include <errno.h>
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#include <getopt.h>
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#include <libevdev/libevdev.h>
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#include <linux/kd.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <termios.h>
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#include <unistd.h>
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#include <xkbcommon/xkbcommon.h>
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#include "sd-bus.h"
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#include "sd-event.h"
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#include "sd-login.h"
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#include "build.h"
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#include "event-util.h"
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#include "macro.h"
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#include "signal-util.h"
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#include "util.h"
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#include "idev.h"
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#include "sysview.h"
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#include "term-internal.h"
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typedef struct Evcat Evcat;
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struct Evcat {
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char *session;
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char *seat;
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sd_event *event;
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sd_bus *bus;
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sysview_context *sysview;
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idev_context *idev;
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idev_session *idev_session;
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bool managed : 1;
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};
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static Evcat *evcat_free(Evcat *e) {
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if (!e)
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return NULL;
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e->idev_session = idev_session_free(e->idev_session);
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e->idev = idev_context_unref(e->idev);
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e->sysview = sysview_context_free(e->sysview);
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e->bus = sd_bus_unref(e->bus);
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e->event = sd_event_unref(e->event);
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free(e->seat);
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free(e->session);
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free(e);
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tcflush(0, TCIOFLUSH);
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return NULL;
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}
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DEFINE_TRIVIAL_CLEANUP_FUNC(Evcat*, evcat_free);
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static bool is_managed(const char *session) {
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unsigned int vtnr;
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struct stat st;
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long mode;
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int r;
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/* Using logind's Controller API is highly fragile if there is already
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* a session controller running. If it is registered as controller
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* itself, TakeControl will simply fail. But if its a legacy controller
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* that does not use logind's controller API, we must never register
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* our own controller. Otherwise, we really mess up the VT. Therefore,
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* only run in managed mode if there's no-one else. */
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if (geteuid() == 0)
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return false;
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if (!isatty(1))
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return false;
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if (!session)
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return false;
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r = sd_session_get_vt(session, &vtnr);
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if (r < 0 || vtnr < 1 || vtnr > 63)
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return false;
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mode = 0;
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r = ioctl(1, KDGETMODE, &mode);
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if (r < 0 || mode != KD_TEXT)
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return false;
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r = fstat(1, &st);
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if (r < 0 || minor(st.st_rdev) != vtnr)
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return false;
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return true;
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}
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static int evcat_new(Evcat **out) {
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_cleanup_(evcat_freep) Evcat *e = NULL;
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int r;
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assert(out);
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e = new0(Evcat, 1);
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if (!e)
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return log_oom();
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r = sd_pid_get_session(getpid(), &e->session);
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if (r < 0)
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return log_error_errno(r, "Cannot retrieve logind session: %m");
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r = sd_session_get_seat(e->session, &e->seat);
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if (r < 0)
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return log_error_errno(r, "Cannot retrieve seat of logind session: %m");
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e->managed = is_managed(e->session);
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r = sd_event_default(&e->event);
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if (r < 0)
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return r;
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r = sd_bus_open_system(&e->bus);
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if (r < 0)
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return r;
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r = sd_bus_attach_event(e->bus, e->event, SD_EVENT_PRIORITY_NORMAL);
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if (r < 0)
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return r;
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r = sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1);
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if (r < 0)
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return r;
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r = sd_event_add_signal(e->event, NULL, SIGTERM, NULL, NULL);
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if (r < 0)
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return r;
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r = sd_event_add_signal(e->event, NULL, SIGINT, NULL, NULL);
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if (r < 0)
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return r;
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r = sysview_context_new(&e->sysview,
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SYSVIEW_CONTEXT_SCAN_LOGIND |
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SYSVIEW_CONTEXT_SCAN_EVDEV,
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e->event,
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e->bus,
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NULL);
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if (r < 0)
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return r;
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r = idev_context_new(&e->idev, e->event, e->bus);
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if (r < 0)
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return r;
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*out = e;
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e = NULL;
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return 0;
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}
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static void kdata_print(idev_data *data) {
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idev_data_keyboard *k = &data->keyboard;
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char buf[128];
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uint32_t i, c;
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int cwidth;
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/* Key-press state: UP/DOWN/REPEAT */
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printf(" %-6s", k->value == 0 ? "UP" :
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k->value == 1 ? "DOWN" :
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"REPEAT");
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/* Resync state */
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printf(" | %-6s", data->resync ? "RESYNC" : "");
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/* Keycode that triggered the event */
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printf(" | %5u", (unsigned)k->keycode);
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/* Well-known name of the keycode */
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printf(" | %-20s", libevdev_event_code_get_name(EV_KEY, k->keycode) ? : "<unknown>");
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/* Well-known modifiers */
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printf(" | %-5s", (k->mods & IDEV_KBDMOD_SHIFT) ? "SHIFT" : "");
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printf(" %-4s", (k->mods & IDEV_KBDMOD_CTRL) ? "CTRL" : "");
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printf(" %-3s", (k->mods & IDEV_KBDMOD_ALT) ? "ALT" : "");
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printf(" %-5s", (k->mods & IDEV_KBDMOD_LINUX) ? "LINUX" : "");
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printf(" %-4s", (k->mods & IDEV_KBDMOD_CAPS) ? "CAPS" : "");
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/* Consumed modifiers */
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printf(" | %-5s", (k->consumed_mods & IDEV_KBDMOD_SHIFT) ? "SHIFT" : "");
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printf(" %-4s", (k->consumed_mods & IDEV_KBDMOD_CTRL) ? "CTRL" : "");
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printf(" %-3s", (k->consumed_mods & IDEV_KBDMOD_ALT) ? "ALT" : "");
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printf(" %-5s", (k->consumed_mods & IDEV_KBDMOD_LINUX) ? "LINUX" : "");
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printf(" %-4s", (k->consumed_mods & IDEV_KBDMOD_CAPS) ? "CAPS" : "");
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/* Resolved symbols */
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printf(" |");
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for (i = 0; i < k->n_syms; ++i) {
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buf[0] = 0;
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xkb_keysym_get_name(k->keysyms[i], buf, sizeof(buf));
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if (is_locale_utf8()) {
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c = k->codepoints[i];
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if (c < 0x110000 && c > 0x20 && (c < 0x7f || c > 0x9f)) {
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/* "%4lc" doesn't work well, so hard-code it */
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cwidth = mk_wcwidth(c);
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while (cwidth++ < 2)
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printf(" ");
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printf(" '%lc':", (wchar_t)c);
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} else {
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printf(" ");
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}
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}
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printf(" XKB_KEY_%-30s", buf);
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}
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printf("\n");
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}
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static bool kdata_is_exit(idev_data *data) {
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idev_data_keyboard *k = &data->keyboard;
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if (k->value != 1)
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return false;
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if (k->n_syms != 1)
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return false;
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return k->codepoints[0] == 'q';
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}
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static int evcat_idev_fn(idev_session *session, void *userdata, idev_event *ev) {
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Evcat *e = userdata;
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switch (ev->type) {
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case IDEV_EVENT_DEVICE_ADD:
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idev_device_enable(ev->device_add.device);
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break;
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case IDEV_EVENT_DEVICE_REMOVE:
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idev_device_disable(ev->device_remove.device);
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break;
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case IDEV_EVENT_DEVICE_DATA:
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switch (ev->device_data.data.type) {
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case IDEV_DATA_KEYBOARD:
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if (kdata_is_exit(&ev->device_data.data))
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sd_event_exit(e->event, 0);
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else
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kdata_print(&ev->device_data.data);
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break;
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}
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break;
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}
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return 0;
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}
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static int evcat_sysview_fn(sysview_context *c, void *userdata, sysview_event *ev) {
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unsigned int flags, type;
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Evcat *e = userdata;
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sysview_device *d;
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const char *name;
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int r;
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switch (ev->type) {
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case SYSVIEW_EVENT_SESSION_FILTER:
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if (streq_ptr(e->session, ev->session_filter.id))
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return 1;
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break;
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case SYSVIEW_EVENT_SESSION_ADD:
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assert(!e->idev_session);
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name = sysview_session_get_name(ev->session_add.session);
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flags = 0;
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if (e->managed)
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flags |= IDEV_SESSION_MANAGED;
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r = idev_session_new(&e->idev_session,
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e->idev,
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flags,
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name,
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evcat_idev_fn,
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e);
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if (r < 0)
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return log_error_errno(r, "Cannot create idev session: %m");
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if (e->managed) {
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r = sysview_session_take_control(ev->session_add.session);
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if (r < 0)
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return log_error_errno(r, "Cannot request session control: %m");
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}
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idev_session_enable(e->idev_session);
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break;
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case SYSVIEW_EVENT_SESSION_REMOVE:
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idev_session_disable(e->idev_session);
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e->idev_session = idev_session_free(e->idev_session);
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if (sd_event_get_exit_code(e->event, &r) == -ENODATA)
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sd_event_exit(e->event, 0);
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break;
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case SYSVIEW_EVENT_SESSION_ATTACH:
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d = ev->session_attach.device;
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type = sysview_device_get_type(d);
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if (type == SYSVIEW_DEVICE_EVDEV) {
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r = idev_session_add_evdev(e->idev_session, sysview_device_get_ud(d));
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if (r < 0)
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return log_error_errno(r, "Cannot add evdev device to idev: %m");
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}
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break;
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case SYSVIEW_EVENT_SESSION_DETACH:
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d = ev->session_detach.device;
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type = sysview_device_get_type(d);
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if (type == SYSVIEW_DEVICE_EVDEV) {
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r = idev_session_remove_evdev(e->idev_session, sysview_device_get_ud(d));
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if (r < 0)
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return log_error_errno(r, "Cannot remove evdev device from idev: %m");
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}
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break;
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case SYSVIEW_EVENT_SESSION_CONTROL:
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r = ev->session_control.error;
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if (r < 0)
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return log_error_errno(r, "Cannot acquire session control: %m");
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r = ioctl(1, KDSKBMODE, K_UNICODE);
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if (r < 0)
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return log_error_errno(errno, "Cannot set K_UNICODE on stdout: %m");
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r = ioctl(1, KDSETMODE, KD_TEXT);
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if (r < 0)
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return log_error_errno(errno, "Cannot set KD_TEXT on stdout: %m");
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printf("\n");
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break;
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}
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return 0;
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}
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static int evcat_run(Evcat *e) {
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struct termios in_attr, saved_attr;
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int r;
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assert(e);
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if (!e->managed && geteuid() > 0)
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log_warning("You run in unmanaged mode without being root. This is likely to produce no output..");
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printf("evcat - Read and catenate events from selected input devices\n"
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" Running on seat '%s' in user-session '%s'\n"
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" Exit by pressing ^C or 'q'\n\n",
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e->seat ? : "seat0", e->session ? : "<none>");
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r = sysview_context_start(e->sysview, evcat_sysview_fn, e);
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if (r < 0)
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goto out;
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r = tcgetattr(0, &in_attr);
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if (r < 0) {
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r = -errno;
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goto out;
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}
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saved_attr = in_attr;
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in_attr.c_lflag &= ~ECHO;
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r = tcsetattr(0, TCSANOW, &in_attr);
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if (r < 0) {
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r = -errno;
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goto out;
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}
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r = sd_event_loop(e->event);
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tcsetattr(0, TCSANOW, &saved_attr);
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printf("exiting..\n");
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out:
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sysview_context_stop(e->sysview);
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return r;
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}
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static int help(void) {
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printf("%s [OPTIONS...]\n\n"
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"Read and catenate events from selected input devices.\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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, program_invocation_short_name);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{},
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};
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int c;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_VERSION:
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puts(PACKAGE_STRING);
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puts(SYSTEMD_FEATURES);
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return 0;
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unhandled option");
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}
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if (argc > optind) {
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log_error("Too many arguments");
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return -EINVAL;
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}
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return 1;
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}
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int main(int argc, char *argv[]) {
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_cleanup_(evcat_freep) Evcat *e = NULL;
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int r;
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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setlocale(LC_ALL, "");
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if (!is_locale_utf8())
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log_warning("Locale is not set to UTF-8. Codepoints will not be printed!");
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r = parse_argv(argc, argv);
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if (r <= 0)
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goto finish;
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r = evcat_new(&e);
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if (r < 0)
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goto finish;
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r = evcat_run(e);
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finish:
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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