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 <errno.h>
  25 #include <sys/socket.h>
  26 #include <sys/un.h>
  27
  28 #include "common/socket.h"
  29 #include "common/util.h"
  30
  31 #define CONTROL_UNIX_SOCKET_PATH ".awesome_ctl."
  32
  33 /** Get a sockaddr_un struct with information feeded for opening a
  34  * communication to the awesome socket for given display
  35  * \param display the display number
  36  * \return sockaddr_un struct ready to be used or NULL if a problem occured
  37  */
  38 struct sockaddr_un *
  39 socket_getaddr(const char *display)
  40 {
  41     char *homedir, *tmp;
  42     const char *real_display = NULL;
  43     ssize_t path_len, display_len;
  44     struct sockaddr_un *addr;
  45
  46     addr = p_new(struct sockaddr_un, 1);
  47     homedir = getenv("HOME");
  48     display_len = a_strlen(display);
  49     if(display_len)
  50     {
  51         if((tmp = strchr(display, ':')))
  52             real_display = tmp + 1;
  53         else
  54             real_display = display;
  55         if((tmp = strrchr(display, '.')))
  56             *tmp = '\0';
  57     }
  58
  59     /* a_strlen(display) because we strcat on display and
  60      * + 2 for / and \0 */
  61     path_len = a_strlen(homedir) + sizeof(CONTROL_UNIX_SOCKET_PATH)-1
  62                + (display_len ? (a_strlen(real_display)) : 1) + 2;
  63
  64     if(path_len >= ssizeof(addr->sun_path))
  65     {
  66         fprintf(stderr, "error: path of control UNIX domain socket is too long");
  67         return NULL;
  68     }
  69     a_strcpy(addr->sun_path, path_len, homedir);
  70     a_strcat(addr->sun_path, path_len, "/");
  71     a_strcat(addr->sun_path, path_len, CONTROL_UNIX_SOCKET_PATH);
  72     if(display_len)
  73         a_strcat(addr->sun_path, path_len, real_display);
  74     else
  75         a_strcat(addr->sun_path, path_len, "0");
  76
  77     addr->sun_family = AF_UNIX;
  78
  79     return addr;
  80 }
  81
  82 /** Get a AF_UNIX socket for communicating with awesome
  83  * \return the socket file descriptor
  84  */
  85 int
  86 socket_getclient(void)
  87 {
  88     int csfd;
  89
  90     csfd = socket(AF_UNIX, SOCK_DGRAM, 0);
  91
  92     if(csfd < 0)
  93         warn("error opening UNIX domain socket: %s", strerror(errno));
  94
  95     return csfd;
  96 }
  97 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80