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         disp->hostname = NULL;
  41         len = 128;
  42         do {
  43             len *= 2;
  44             disp->hostname = sresize(disp->hostname, len, char);
  45             if ((gethostname(disp->hostname, len) < 0) &&
  46                 (errno != ENAMETOOLONG)) {
  47                 sfree(disp->hostname);
  48                 disp->hostname = NULL;
  49                 return;
  50             }
  51         } while (strlen(disp->hostname) >= len-1);
  52     }
  53
  54     /*
  55      * Find the .Xauthority file.
  56      */
  57     needs_free = FALSE;
  58     xauthfile = getenv("XAUTHORITY");
  59     if (!xauthfile) {
  60         xauthfile = getenv("HOME");
  61         if (xauthfile) {
  62             xauthfile = dupcat(xauthfile, "/.Xauthority", NULL);
  63             needs_free = TRUE;
  64         }
  65     }
  66
  67     if (xauthfile) {
  68         x11_get_auth_from_authfile(disp, xauthfile);
  69         if (needs_free)
  70             sfree(xauthfile);
  71     }
  72 }
  73
  74 const int platform_uses_x11_unix_by_default = TRUE;