git.distorted.org.uk Git - u/mdw/putty/blob - unix/ux_x11.c

   1 /*
   2  * ux_x11.c: fetch local auth data for X forwarding.
   3  */
   4
   5 #include <ctype.h>
   6 #include <unistd.h>
   7 #include <assert.h>
   8 #include <stdlib.h>
   9 #include <errno.h>
  10
  11 #include "putty.h"
  12 #include "ssh.h"
  13 #include "network.h"
  14
  15 void platform_get_x11_auth(struct X11Display *disp, const Config *cfg)
  16 {
  17     char *xauthfile;
  18     int needs_free;
  19
  20     /*
  21      * Upgrade an IP-style localhost display to a Unix-socket
  22      * display.
  23      */
  24     if (!disp->unixdomain && sk_address_is_local(disp->addr)) {
  25         sk_addr_free(disp->addr);
  26         disp->unixdomain = TRUE;
  27         disp->addr = platform_get_x11_unix_address(NULL, disp->displaynum);
  28         disp->realhost = dupprintf("unix:%d", disp->displaynum);
  29         disp->port = 0;
  30     }
  31
  32     /*
  33      * Set the hostname for Unix-socket displays, so that we'll
  34      * look it up correctly in the X authority file.
  35      */
  36     if (disp->unixdomain) {
  37         int len;
  38
  39         sfree(disp->hostname);
  40         len = 128;
  41         do {
  42             len *= 2;
  43             disp->hostname = snewn(len, char);
  44             if ((gethostname(disp->hostname, len) < 0) &&
  45                 (errno != ENAMETOOLONG)) {
  46                 disp->hostname = NULL;
  47                 return;
  48             }
  49         } while (strlen(disp->hostname) >= len-1);
  50     }
  51
  52     /*
  53      * Find the .Xauthority file.
  54      */
  55     needs_free = FALSE;
  56     xauthfile = getenv("XAUTHORITY");
  57     if (!xauthfile) {
  58         xauthfile = getenv("HOME");
  59         if (xauthfile) {
  60             xauthfile = dupcat(xauthfile, "/.Xauthority", NULL);
  61             needs_free = TRUE;
  62         }
  63     }
  64
  65     if (xauthfile) {
  66         x11_get_auth_from_authfile(disp, xauthfile);
  67         if (needs_free)
  68             sfree(xauthfile);
  69     }
  70 }
  71
  72 const int platform_uses_x11_unix_by_default = TRUE;