src/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->arg1, header->arg2);
  54         free(data);
  55         break;
  56     case VDAGENTD_CLIPBOARD_GRAB:
  57         vdagent_x11_clipboard_grab(x11, header->arg1, (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->arg1, header->arg2,
  63                                    data, header->size);
  64         /* vdagent_x11_clipboard_data takes ownership of the data (or frees
  65            it immediately) */
  66         break;
  67     case VDAGENTD_CLIPBOARD_RELEASE:
  68         vdagent_x11_clipboard_release(x11, header->arg1);
  69         free(data);
  70         break;
  71     default:
  72         if (verbose)
  73             fprintf(logfile, "Unknown message from vdagentd type: %d\n",
  74                     header->type);
  75         free(data);
  76     }
  77 }
  78
  79 static void usage(FILE *fp)
  80 {
  81     fprintf(fp,
  82             "vdagent -- spice agent xorg client\n"
  83             "options:\n"
  84             "  -h    print this text\n"
  85             "  -d    log debug messages\n"
  86             "  -x    don't daemonize (and log to logfile)\n");
  87 }
  88
  89 static void quit_handler(int sig)
  90 {
  91     quit = 1;
  92 }
  93
  94 void daemonize(void)
  95 {
  96     int x, retval = 0;
  97
  98     /* detach from terminal */
  99     switch (fork()) {
 100     case 0:
 101         close(0); close(1); close(2);
 102         setsid();
 103         x = open("/dev/null", O_RDWR); dup(x); dup(x);
 104         break;
 105     case -1:
 106         fprintf(logfile, "fork: %s\n", strerror(errno));
 107         retval = 1;
 108     default:
 109         udscs_destroy_connection(&client);
 110         if (logfile != stderr)
 111             fclose(logfile);
 112         exit(retval);
 113     }
 114 }
 115
 116 int main(int argc, char *argv[])
 117 {
 118     fd_set readfds, writefds;
 119     int c, n, nfds, x11_fd, retval = 0;
 120     int do_daemonize = 1;
 121     char *home, filename[1024];
 122     struct sigaction act;
 123
 124     for (;;) {
 125         if (-1 == (c = getopt(argc, argv, "-dxh")))
 126             break;
 127         switch (c) {
 128         case 'd':
 129             verbose++;
 130             break;
 131         case 'x':
 132             do_daemonize = 0;
 133             break;
 134         case 'h':
 135             usage(stdout);
 136             return 0;
 137         default:
 138             usage(stderr);
 139             return 1;
 140         }
 141     }
 142
 143     memset(&act, 0, sizeof(act));
 144     act.sa_flags = SA_RESTART;
 145     act.sa_handler = quit_handler;
 146     sigaction(SIGINT, &act, NULL);
 147     sigaction(SIGHUP, &act, NULL);
 148     sigaction(SIGTERM, &act, NULL);
 149     sigaction(SIGQUIT, &act, NULL);
 150
 151     logfile = stderr;
 152     home = getenv("HOME");
 153     if (home) {
 154         snprintf(filename, sizeof(filename), "%s/.spice-vdagent", home);
 155         n = mkdir(filename, 0755);
 156         snprintf(filename, sizeof(filename), "%s/.spice-vdagent/log", home);
 157         if (do_daemonize) {
 158             logfile = fopen(filename, "w");
 159             if (!logfile) {
 160                 fprintf(stderr, "Error opening %s: %s\n", filename,
 161                         strerror(errno));
 162                 logfile = stderr;
 163             }
 164         }
 165     } else {
 166         fprintf(stderr, "Could not get home directory, logging to stderr\n");
 167     }
 168
 169     client = udscs_connect(VDAGENTD_SOCKET, daemon_read_complete, NULL,
 170                            vdagentd_messages, VDAGENTD_NO_MESSAGES,
 171                            verbose? logfile:NULL, logfile);
 172     if (!client) {
 173         if (logfile != stderr)
 174             fclose(logfile);
 175         return 1;
 176     }
 177
 178     if (do_daemonize)
 179         daemonize();
 180
 181     x11 = vdagent_x11_create(client, logfile, verbose);
 182     if (!x11) {
 183         udscs_destroy_connection(&client);
 184         if (logfile != stderr)
 185             fclose(logfile);
 186         return 1;
 187     }
 188
 189     while (client && !quit) {
 190         FD_ZERO(&readfds);
 191         FD_ZERO(&writefds);
 192
 193         nfds = udscs_client_fill_fds(client, &readfds, &writefds);
 194         x11_fd = vdagent_x11_get_fd(x11);
 195         FD_SET(x11_fd, &readfds);
 196         if (x11_fd >= nfds)
 197             nfds = x11_fd + 1;
 198
 199         n = select(nfds, &readfds, &writefds, NULL, NULL);
 200         if (n == -1) {
 201             if (errno == EINTR)
 202                 continue;
 203             fprintf(logfile, "Fatal error select: %s\n", strerror(errno));
 204             retval = 1;
 205             break;
 206         }
 207
 208         if (FD_ISSET(x11_fd, &readfds))
 209             vdagent_x11_do_read(x11);
 210         udscs_client_handle_fds(&client, &readfds, &writefds);
 211         fflush(logfile);
 212     }
 213
 214     vdagent_x11_destroy(x11);
 215     udscs_destroy_connection(&client);
 216     if (logfile != stderr)
 217         fclose(logfile);
 218
 219     return retval;
 220 }