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, uint8_t *data)
  46 {
  47     switch (header->type) {
  48     case VDAGENTD_MONITORS_CONFIG:
  49         vdagent_x11_set_monitor_config(x11, (VDAgentMonitorsConfig *)data);
  50         free(data);
  51         break;
  52     case VDAGENTD_CLIPBOARD_REQUEST:
  53         vdagent_x11_clipboard_request(x11, header->opaque);
  54         free(data);
  55         break;
  56     case VDAGENTD_CLIPBOARD_GRAB:
  57         vdagent_x11_clipboard_grab(x11, (uint32_t *)data,
  58                                    header->size / sizeof(uint32_t));
  59         free(data);
  60         break;
  61     case VDAGENTD_CLIPBOARD_DATA:
  62         vdagent_x11_clipboard_data(x11, header->opaque, data, header->size);
  63         /* vdagent_x11_clipboard_data takes ownership of the data (or frees
  64            it immediately) */
  65         break;
  66     case VDAGENTD_CLIPBOARD_RELEASE:
  67         vdagent_x11_clipboard_release(x11);
  68         free(data);
  69         break;
  70     default:
  71         if (verbose)
  72             fprintf(logfile, "Unknown message from vdagentd type: %d\n",
  73                     header->type);
  74         free(data);
  75     }
  76 }
  77
  78 static void usage(FILE *fp)
  79 {
  80     fprintf(fp,
  81             "vdagent -- spice agent xorg client\n"
  82             "options:\n"
  83             "  -h    print this text\n"
  84             "  -d    log debug messages\n"
  85             "  -x    don't daemonize (and log to logfile)\n");
  86 }
  87
  88 static void quit_handler(int sig)
  89 {
  90     quit = 1;
  91 }
  92
  93 void daemonize(void)
  94 {
  95     int x, retval = 0;
  96
  97     /* detach from terminal */
  98     switch (fork()) {
  99     case 0:
 100         close(0); close(1); close(2);
 101         setsid();
 102         x = open("/dev/null", O_RDWR); dup(x); dup(x);
 103         break;
 104     case -1:
 105         fprintf(logfile, "fork: %s\n", strerror(errno));
 106         retval = 1;
 107     default:
 108         udscs_destroy_connection(&client);
 109         if (logfile != stderr)
 110             fclose(logfile);
 111         exit(retval);
 112     }
 113 }
 114
 115 int main(int argc, char *argv[])
 116 {
 117     fd_set readfds, writefds;
 118     int c, n, nfds, x11_fd, retval = 0;
 119     int do_daemonize = 1;
 120     char *home, filename[1024];
 121     struct sigaction act;
 122
 123     for (;;) {
 124         if (-1 == (c = getopt(argc, argv, "-dxh")))
 125             break;
 126         switch (c) {
 127         case 'd':
 128             verbose++;
 129             break;
 130         case 'x':
 131             do_daemonize = 0;
 132             break;
 133         case 'h':
 134             usage(stdout);
 135             return 0;
 136         default:
 137             usage(stderr);
 138             return 1;
 139         }
 140     }
 141
 142     memset(&act, 0, sizeof(act));
 143     act.sa_flags = SA_RESTART;
 144     act.sa_handler = quit_handler;
 145     sigaction(SIGINT, &act, NULL);
 146     sigaction(SIGHUP, &act, NULL);
 147     sigaction(SIGTERM, &act, NULL);
 148     sigaction(SIGQUIT, &act, NULL);
 149
 150     logfile = stderr;
 151     home = getenv("HOME");
 152     if (home) {
 153         snprintf(filename, sizeof(filename), "%s/.spice-vdagent", home);
 154         n = mkdir(filename, 0755);
 155         snprintf(filename, sizeof(filename), "%s/.spice-vdagent/log", home);
 156         if (do_daemonize) {
 157             logfile = fopen(filename, "w");
 158             if (!logfile) {
 159                 fprintf(stderr, "Error opening %s: %s\n", filename,
 160                         strerror(errno));
 161                 logfile = stderr;
 162             }
 163         }
 164     } else {
 165         fprintf(stderr, "Could not get home directory, logging to stderr\n");
 166     }
 167
 168     client = udscs_connect(VDAGENTD_SOCKET, daemon_read_complete, NULL,
 169                            vdagentd_messages, VDAGENTD_NO_MESSAGES,
 170                            verbose? logfile:NULL, logfile);
 171     if (!client) {
 172         if (logfile != stderr)
 173             fclose(logfile);
 174         return 1;
 175     }
 176
 177     if (do_daemonize)
 178         daemonize();
 179
 180     x11 = vdagent_x11_create(client, logfile, verbose);
 181     if (!x11) {
 182         udscs_destroy_connection(&client);
 183         if (logfile != stderr)
 184             fclose(logfile);
 185         return 1;
 186     }
 187
 188     while (client && !quit) {
 189         FD_ZERO(&readfds);
 190         FD_ZERO(&writefds);
 191
 192         nfds = udscs_client_fill_fds(client, &readfds, &writefds);
 193         x11_fd = vdagent_x11_get_fd(x11);
 194         FD_SET(x11_fd, &readfds);
 195         if (x11_fd >= nfds)
 196             nfds = x11_fd + 1;
 197
 198         n = select(nfds, &readfds, &writefds, NULL, NULL);
 199         if (n == -1) {
 200             if (errno == EINTR)
 201                 continue;
 202             fprintf(logfile, "Fatal error select: %s\n", strerror(errno));
 203             retval = 1;
 204             break;
 205         }
 206
 207         if (FD_ISSET(x11_fd, &readfds))
 208             vdagent_x11_do_read(x11);
 209         udscs_client_handle_fds(&client, &readfds, &writefds);
 210         fflush(logfile);
 211     }
 212
 213     vdagent_x11_destroy(x11);
 214     udscs_destroy_connection(&client);
 215     if (logfile != stderr)
 216         fclose(logfile);
 217
 218     return retval;
 219 }