vdagent.c

   1 /*  vdagent.c xorg-client to vdagentd (daemon).
   2
   3     Copyright 2010 Red Hat, Inc.
   4
   5     Red Hat Authors:
   6     Hans de Goede <hdegoede@redhat.com>
   7
   8     This program is free software: you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation, either version 3 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27 #include <errno.h>
  28 #include <signal.h>
  29 #include <sys/select.h>
  30 #include <sys/stat.h>
  31 #include <spice/vd_agent.h>
  32
  33 #include "udscs.h"
  34 #include "vdagentd-proto.h"
  35 #include "vdagentd-proto-strings.h"
  36 #include "vdagent-x11.h"
  37
  38 static int verbose = 0;
  39 static struct vdagent_x11 *x11 = NULL;
  40 static struct udscs_connection *client = NULL;
  41 static FILE *logfile = NULL;
  42 static int quit = 0;
  43
  44 void daemon_read_complete(struct udscs_connection **connp,
  45     struct udscs_message_header *header, const uint8_t *data)
  46 {
  47     switch (header->type) {
  48     case VDAGENTD_MONITORS_CONFIG:
  49         vdagent_x11_set_monitor_config(x11, (VDAgentMonitorsConfig *)data);
  50         break;
  51     case VDAGENTD_CLIPBOARD_REQUEST:
  52         vdagent_x11_clipboard_request(x11, header->opaque);
  53         break;
  54     case VDAGENTD_CLIPBOARD_GRAB:
  55         vdagent_x11_clipboard_grab(x11, (uint32_t *)data,
  56                                    header->size / sizeof(uint32_t));
  57         break;
  58     case VDAGENTD_CLIPBOARD_DATA:
  59         vdagent_x11_clipboard_data(x11, header->opaque, data, header->size);
  60         break;
  61     case VDAGENTD_CLIPBOARD_RELEASE:
  62         vdagent_x11_clipboard_release(x11);
  63         break;
  64     default:
  65         if (verbose)
  66             fprintf(logfile, "Unknown message from vdagentd type: %d\n",
  67                     header->type);
  68     }
  69 }
  70
  71 static void usage(FILE *fp)
  72 {
  73     fprintf(fp,
  74             "vdagent -- spice agent xorg client\n"
  75             "options:\n"
  76             "  -h    print this text\n"
  77             "  -d    log debug messages\n"
  78             "  -x    don't daemonize (and log to logfile)\n");
  79 }
  80
  81 static void quit_handler(int sig)
  82 {
  83     quit = 1;
  84 }
  85
  86 void daemonize(void)
  87 {
  88     int x, retval = 0;
  89
  90     /* detach from terminal */
  91     switch (fork()) {
  92     case 0:
  93         close(0); close(1); close(2);
  94         setsid();
  95         x = open("/dev/null", O_RDWR); dup(x); dup(x);
  96         break;
  97     case -1:
  98         fprintf(logfile, "fork: %s\n", strerror(errno));
  99         retval = 1;
 100     default:
 101         udscs_destroy_connection(&client);
 102         if (logfile != stderr)
 103             fclose(logfile);
 104         exit(retval);
 105     }
 106 }
 107
 108 int main(int argc, char *argv[])
 109 {
 110     fd_set readfds, writefds;
 111     int c, n, nfds, x11_fd, retval = 0;
 112     int do_daemonize = 1;
 113     char *home, filename[1024];
 114     struct sigaction act;
 115
 116     for (;;) {
 117         if (-1 == (c = getopt(argc, argv, "-dxh")))
 118             break;
 119         switch (c) {
 120         case 'd':
 121             verbose++;
 122             break;
 123         case 'x':
 124             do_daemonize = 0;
 125             break;
 126         case 'h':
 127             usage(stdout);
 128             return 0;
 129         default:
 130             usage(stderr);
 131             return 1;
 132         }
 133     }
 134
 135     memset(&act, 0, sizeof(act));
 136     act.sa_flags = SA_RESTART;
 137     act.sa_handler = quit_handler;
 138     sigaction(SIGINT, &act, NULL);
 139     sigaction(SIGHUP, &act, NULL);
 140     sigaction(SIGTERM, &act, NULL);
 141     sigaction(SIGQUIT, &act, NULL);
 142
 143     logfile = stderr;
 144     home = getenv("HOME");
 145     if (home) {
 146         snprintf(filename, sizeof(filename), "%s/.spice-vdagent", home);
 147         n = mkdir(filename, 0755);
 148         snprintf(filename, sizeof(filename), "%s/.spice-vdagent/log", home);
 149         if (do_daemonize) {
 150             logfile = fopen(filename, "w");
 151             if (!logfile) {
 152                 fprintf(stderr, "Error opening %s: %s\n", filename,
 153                         strerror(errno));
 154                 logfile = stderr;
 155             }
 156         }
 157     } else {
 158         fprintf(stderr, "Could not get home directory, logging to stderr\n");
 159     }
 160
 161     client = udscs_connect(VDAGENTD_SOCKET, daemon_read_complete, NULL,
 162                            vdagentd_messages, VDAGENTD_NO_MESSAGES,
 163                            verbose? logfile:NULL, logfile);
 164     if (!client) {
 165         if (logfile != stderr)
 166             fclose(logfile);
 167         return 1;
 168     }
 169
 170     if (do_daemonize)
 171         daemonize();
 172
 173     x11 = vdagent_x11_create(client, logfile, verbose);
 174     if (!x11) {
 175         udscs_destroy_connection(&client);
 176         if (logfile != stderr)
 177             fclose(logfile);
 178         return 1;
 179     }
 180
 181     while (client && !quit) {
 182         FD_ZERO(&readfds);
 183         FD_ZERO(&writefds);
 184
 185         nfds = udscs_client_fill_fds(client, &readfds, &writefds);
 186         x11_fd = vdagent_x11_get_fd(x11);
 187         FD_SET(x11_fd, &readfds);
 188         if (x11_fd >= nfds)
 189             nfds = x11_fd + 1;
 190
 191         n = select(nfds, &readfds, &writefds, NULL, NULL);
 192         if (n == -1) {
 193             if (errno == EINTR)
 194                 continue;
 195             fprintf(logfile, "Fatal error select: %s\n", strerror(errno));
 196             retval = 1;
 197             break;
 198         }
 199
 200         if (FD_ISSET(x11_fd, &readfds))
 201             vdagent_x11_do_read(x11);
 202         udscs_client_handle_fds(&client, &readfds, &writefds);
 203         fflush(logfile);
 204     }
 205
 206     vdagent_x11_destroy(x11);
 207     udscs_destroy_connection(&client);
 208     if (logfile != stderr)
 209         fclose(logfile);
 210
 211     return retval;
 212 }