437 lines
11 KiB
C
437 lines
11 KiB
C
/***
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This file is part of avahi.
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avahi 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
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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avahi is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with avahi; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <assert.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <avahi-common/error.h>
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#include <avahi-common/dbus.h>
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#include "avahi-common/avahi-malloc.h"
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#include <avahi-core/log.h>
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#include <avahi-core/core.h>
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#ifdef ENABLE_CHROOT
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#include "chroot.h"
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#endif
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#include "main.h"
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#include "dbus-util.h"
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DBusHandlerResult avahi_dbus_respond_error(DBusConnection *c, DBusMessage *m, int error, const char *text) {
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DBusMessage *reply;
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assert(-error > -AVAHI_OK);
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assert(-error < -AVAHI_ERR_MAX);
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if (!text)
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text = avahi_strerror(error);
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reply = dbus_message_new_error(m, avahi_error_number_to_dbus(error), text);
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if (!reply) {
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avahi_log_error("Failed allocate message");
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return DBUS_HANDLER_RESULT_NEED_MEMORY;
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}
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dbus_connection_send(c, reply, NULL);
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dbus_message_unref(reply);
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avahi_log_debug(__FILE__": Responding error '%s' (%i)", text, error);
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return DBUS_HANDLER_RESULT_HANDLED;
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}
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DBusHandlerResult avahi_dbus_respond_string(DBusConnection *c, DBusMessage *m, const char *text) {
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DBusMessage *reply;
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reply = dbus_message_new_method_return(m);
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if (!reply) {
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avahi_log_error("Failed allocate message");
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return DBUS_HANDLER_RESULT_NEED_MEMORY;
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}
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dbus_message_append_args(reply, DBUS_TYPE_STRING, &text, DBUS_TYPE_INVALID);
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dbus_connection_send(c, reply, NULL);
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dbus_message_unref(reply);
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return DBUS_HANDLER_RESULT_HANDLED;
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}
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DBusHandlerResult avahi_dbus_respond_int32(DBusConnection *c, DBusMessage *m, int32_t i) {
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DBusMessage *reply;
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reply = dbus_message_new_method_return(m);
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if (!reply) {
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avahi_log_error("Failed allocate message");
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return DBUS_HANDLER_RESULT_NEED_MEMORY;
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}
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dbus_message_append_args(reply, DBUS_TYPE_INT32, &i, DBUS_TYPE_INVALID);
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dbus_connection_send(c, reply, NULL);
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dbus_message_unref(reply);
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return DBUS_HANDLER_RESULT_HANDLED;
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}
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DBusHandlerResult avahi_dbus_respond_uint32(DBusConnection *c, DBusMessage *m, uint32_t u) {
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DBusMessage *reply;
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reply = dbus_message_new_method_return(m);
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if (!reply) {
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avahi_log_error("Failed allocate message");
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return DBUS_HANDLER_RESULT_NEED_MEMORY;
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}
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dbus_message_append_args(reply, DBUS_TYPE_UINT32, &u, DBUS_TYPE_INVALID);
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dbus_connection_send(c, reply, NULL);
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dbus_message_unref(reply);
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return DBUS_HANDLER_RESULT_HANDLED;
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}
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DBusHandlerResult avahi_dbus_respond_boolean(DBusConnection *c, DBusMessage *m, int b) {
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DBusMessage *reply;
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reply = dbus_message_new_method_return(m);
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if (!reply) {
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avahi_log_error("Failed allocate message");
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return DBUS_HANDLER_RESULT_NEED_MEMORY;
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}
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dbus_message_append_args(reply, DBUS_TYPE_BOOLEAN, &b, DBUS_TYPE_INVALID);
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dbus_connection_send(c, reply, NULL);
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dbus_message_unref(reply);
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return DBUS_HANDLER_RESULT_HANDLED;
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}
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DBusHandlerResult avahi_dbus_respond_ok(DBusConnection *c, DBusMessage *m) {
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DBusMessage *reply;
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reply = dbus_message_new_method_return(m);
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if (!reply) {
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avahi_log_error("Failed allocate message");
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return DBUS_HANDLER_RESULT_NEED_MEMORY;
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}
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dbus_connection_send(c, reply, NULL);
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dbus_message_unref(reply);
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return DBUS_HANDLER_RESULT_HANDLED;
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}
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DBusHandlerResult avahi_dbus_respond_path(DBusConnection *c, DBusMessage *m, const char *path) {
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DBusMessage *reply;
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reply = dbus_message_new_method_return(m);
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if (!reply) {
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avahi_log_error("Failed allocate message");
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return DBUS_HANDLER_RESULT_NEED_MEMORY;
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}
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dbus_message_append_args(reply, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID);
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dbus_connection_send(c, reply, NULL);
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dbus_message_unref(reply);
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return DBUS_HANDLER_RESULT_HANDLED;
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}
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void avahi_dbus_append_server_error(DBusMessage *reply) {
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const char *t;
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t = avahi_error_number_to_dbus(avahi_server_errno(avahi_server));
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dbus_message_append_args(
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reply,
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DBUS_TYPE_STRING, &t,
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DBUS_TYPE_INVALID);
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}
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const char *avahi_dbus_map_browse_signal_name(AvahiBrowserEvent e) {
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switch (e) {
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case AVAHI_BROWSER_NEW : return "ItemNew";
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case AVAHI_BROWSER_REMOVE : return "ItemRemove";
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case AVAHI_BROWSER_FAILURE : return "Failure";
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case AVAHI_BROWSER_CACHE_EXHAUSTED : return "CacheExhausted";
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case AVAHI_BROWSER_ALL_FOR_NOW : return "AllForNow";
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}
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abort();
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}
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const char *avahi_dbus_map_resolve_signal_name(AvahiResolverEvent e) {
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switch (e) {
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case AVAHI_RESOLVER_FOUND : return "Found";
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case AVAHI_RESOLVER_FAILURE : return "Failure";
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}
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abort();
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}
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static char *file_get_contents(const char *fname) {
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int fd = -1;
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struct stat st;
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ssize_t size;
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char *buf = NULL;
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assert(fname);
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#ifdef ENABLE_CHROOT
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fd = avahi_chroot_helper_get_fd(fname);
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#else
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fd = open(fname, O_RDONLY);
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#endif
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if (fd < 0) {
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avahi_log_error("Failed to open %s: %s", fname, strerror(errno));
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goto fail;
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}
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if (fstat(fd, &st) < 0) {
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avahi_log_error("stat(%s) failed: %s", fname, strerror(errno));
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goto fail;
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}
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if (!(S_ISREG(st.st_mode))) {
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avahi_log_error("Invalid file %s", fname);
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goto fail;
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}
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if (st.st_size > 1024*1024) { /** 1MB */
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avahi_log_error("File too large %s", fname);
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goto fail;
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}
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buf = avahi_new(char, st.st_size+1);
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if ((size = read(fd, buf, st.st_size)) < 0) {
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avahi_log_error("read() failed: %s\n", strerror(errno));
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goto fail;
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}
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buf[size] = 0;
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close(fd);
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return buf;
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fail:
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if (fd >= 0)
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close(fd);
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if (buf)
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avahi_free(buf);
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return NULL;
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}
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DBusHandlerResult avahi_dbus_handle_introspect(DBusConnection *c, DBusMessage *m, const char *fname) {
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#ifdef AVAHI_DBUS_INTROSPECTION_DIR
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char *contents, *path;
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DBusError error;
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assert(c);
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assert(m);
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assert(fname);
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dbus_error_init(&error);
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if (!dbus_message_get_args(m, &error, DBUS_TYPE_INVALID)) {
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avahi_log_error("Error parsing Introspect message: %s", error.message);
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goto fail;
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}
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path = avahi_strdup_printf("%s/%s", AVAHI_DBUS_INTROSPECTION_DIR, fname);
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contents = file_get_contents(path);
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avahi_free(path);
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if (!contents) {
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avahi_log_error("Failed to load introspection data.");
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goto fail;
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}
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avahi_dbus_respond_string(c, m, contents);
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avahi_free(contents);
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return DBUS_HANDLER_RESULT_HANDLED;
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fail:
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if (dbus_error_is_set(&error))
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dbus_error_free(&error);
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#endif
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return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
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}
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void avahi_dbus_append_string_list(DBusMessage *reply, AvahiStringList *txt) {
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AvahiStringList *p;
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DBusMessageIter iter, sub;
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assert(reply);
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dbus_message_iter_init_append(reply, &iter);
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dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "ay", &sub);
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for (p = txt; p; p = p->next) {
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DBusMessageIter sub2;
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const uint8_t *data = p->text;
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dbus_message_iter_open_container(&sub, DBUS_TYPE_ARRAY, "y", &sub2);
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dbus_message_iter_append_fixed_array(&sub2, DBUS_TYPE_BYTE, &data, p->size);
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dbus_message_iter_close_container(&sub, &sub2);
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}
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dbus_message_iter_close_container(&iter, &sub);
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}
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int avahi_dbus_read_rdata(DBusMessage *m, int idx, void **rdata, uint32_t *size) {
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DBusMessageIter iter, sub;
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int n, j;
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uint8_t *k;
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assert(m);
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dbus_message_iter_init(m, &iter);
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for (j = 0; j < idx; j++)
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dbus_message_iter_next(&iter);
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if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
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dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_BYTE)
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goto fail;
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dbus_message_iter_recurse(&iter, &sub);
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dbus_message_iter_get_fixed_array(&sub, &k, &n);
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*rdata = k;
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*size = n;
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return 0;
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fail:
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avahi_log_warn("Error parsing data");
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*rdata = NULL;
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size = 0;
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return -1;
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}
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int avahi_dbus_read_strlst(DBusMessage *m, int idx, AvahiStringList **l) {
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DBusMessageIter iter, sub;
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int j;
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AvahiStringList *strlst = NULL;
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assert(m);
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assert(l);
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dbus_message_iter_init(m, &iter);
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for (j = 0; j < idx; j++)
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dbus_message_iter_next(&iter);
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if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
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dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_ARRAY)
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goto fail;
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dbus_message_iter_recurse(&iter, &sub);
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for (;;) {
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int at, n;
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const uint8_t *k;
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DBusMessageIter sub2;
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if ((at = dbus_message_iter_get_arg_type(&sub)) == DBUS_TYPE_INVALID)
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break;
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assert(at == DBUS_TYPE_ARRAY);
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if (dbus_message_iter_get_element_type(&sub) != DBUS_TYPE_BYTE)
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goto fail;
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dbus_message_iter_recurse(&sub, &sub2);
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k = (const uint8_t*) "";
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n = 0;
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dbus_message_iter_get_fixed_array(&sub2, &k, &n);
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if (!k)
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k = (const uint8_t*) "";
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strlst = avahi_string_list_add_arbitrary(strlst, k, n);
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dbus_message_iter_next(&sub);
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}
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*l = strlst;
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return 0;
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fail:
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avahi_log_warn("Error parsing TXT data");
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avahi_string_list_free(strlst);
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*l = NULL;
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return -1;
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}
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int avahi_dbus_is_our_own_service(Client *c, AvahiIfIndex interface, AvahiProtocol protocol, const char *name, const char *type, const char *domain) {
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AvahiSEntryGroup *g;
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if (avahi_server_get_group_of_service(avahi_server, interface, protocol, name, type, domain, &g) == AVAHI_OK) {
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EntryGroupInfo *egi;
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for (egi = c->entry_groups; egi; egi = egi->entry_groups_next)
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if (egi->entry_group == g)
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return 1;
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}
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return 0;
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}
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int avahi_dbus_append_rdata(DBusMessage *message, const void *rdata, size_t size) {
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DBusMessageIter iter, sub;
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assert(message);
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dbus_message_iter_init_append(message, &iter);
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if (!(dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, DBUS_TYPE_BYTE_AS_STRING, &sub)) ||
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!(dbus_message_iter_append_fixed_array(&sub, DBUS_TYPE_BYTE, &rdata, size)) ||
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!(dbus_message_iter_close_container(&iter, &sub)))
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return -1;
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return 0;
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}
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