common/socket.c

   1 /*
   2  * socket.c - awesome client, communicate with socket, common functions
   3  *
   4  * Copyright © 2007-2008 Julien Danjou <julien@danjou.info>
   5  * Copyright © 2007 daniel@brinkers.de
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  */
  22
  23 #include <stdio.h>
  24 #include <sys/socket.h>
  25 #include <sys/un.h>
  26
  27 #include "common/socket.h"
  28 #include "common/util.h"
  29
  30 #define CONTROL_UNIX_SOCKET_PATH ".awesome_ctl."
  31
  32 /** Get a sockaddr_un struct with information feeded for opening a
  33  * communication to the awesome socket for given display
  34  * \param display the display number
  35  * \return sockaddr_un struct ready to be used or NULL if a problem occured
  36  */
  37 struct sockaddr_un *
  38 get_client_addr(const char *display)
  39 {
  40     char *homedir, *tmp;
  41     const char *real_display = NULL;
  42     ssize_t path_len;
  43     struct sockaddr_un *addr;
  44
  45     addr = p_new(struct sockaddr_un, 1);
  46     homedir = getenv("HOME");
  47     if(a_strlen(display))
  48     {
  49         if((tmp = strchr(display, ':')))
  50             real_display = tmp + 1;
  51         else
  52             real_display = display;
  53         if((tmp = strrchr(display, '.')))
  54             *tmp = '\0';
  55     }
  56
  57     /* a_strlen(display) because we strcat on display and
  58      * + 2 for / and \0 */
  59     path_len = a_strlen(homedir) + a_strlen(CONTROL_UNIX_SOCKET_PATH)
  60                + (a_strlen(display) ? (a_strlen(real_display)) : 1) + 2;
  61
  62     if(path_len >= ssizeof(addr->sun_path))
  63     {
  64         fprintf(stderr, "error: path of control UNIX domain socket is too long");
  65         return NULL;
  66     }
  67     a_strcpy(addr->sun_path, path_len, homedir);
  68     a_strcat(addr->sun_path, path_len, "/");
  69     a_strcat(addr->sun_path, path_len, CONTROL_UNIX_SOCKET_PATH);
  70     if(a_strlen(display))
  71         a_strcat(addr->sun_path, path_len, real_display);
  72     else
  73         a_strcat(addr->sun_path, path_len, "0");
  74
  75     addr->sun_family = AF_UNIX;
  76
  77     return addr;
  78 }
  79
  80 /** Get a AF_UNIX socket for communicating with awesome
  81  * \return the socket file descriptor
  82  */
  83 int
  84 get_client_socket(void)
  85 {
  86     int csfd;
  87
  88     csfd = socket(AF_UNIX, SOCK_DGRAM, 0);
  89
  90     if(csfd < 0)
  91         perror("error opening UNIX domain socket");
  92
  93     return csfd;
  94 }
  95 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80