2 * ux_x11.c: fetch local auth data for X forwarding.
9 void platform_get_x11_auth(char *display
, int *protocol
,
10 unsigned char *data
, int *datalen
)
14 int maxsize
= *datalen
;
18 * Normally we should run `xauth list DISPLAYNAME'. However,
19 * there's an oddity when the display is local: the display
20 * `localhost:0' (or `:0') should become just `:0'.
22 if (!strncmp(display
, "localhost:", 10))
23 command
= dupprintf("xauth list %s 2>/dev/null", display
+9);
25 command
= dupprintf("xauth list %s 2>/dev/null", display
);
26 fp
= popen(command
, "r");
30 return; /* assume no auth */
32 localbuf
= snewn(maxsize
, char);
36 * Read a line from stdin, and attempt to parse it into a
37 * display name (ignored), auth protocol, and auth string.
39 int c
, i
, hexdigit
, proto
;
42 /* Skip the display name. */
43 while (c
= getc(fp
), c
!= EOF
&& c
!= '\n' && !isspace(c
));
45 if (c
== '\n') continue;
47 /* Skip white space. */
48 while (c
!= EOF
&& c
!= '\n' && isspace(c
))
51 if (c
== '\n') continue;
53 /* Read the auth protocol name, and see if it matches any we
56 while (c
!= EOF
&& c
!= '\n' && !isspace(c
)) {
57 if (i
< lenof(protoname
)-1) protoname
[i
++] = c
;
62 for (i
= X11_NO_AUTH
; ++i
< X11_NAUTHS
;) {
63 if (!strcmp(protoname
, x11_authnames
[i
]))
66 if (i
>= X11_NAUTHS
|| i
<= proto
) {
67 /* Unrecognised protocol name, or a worse one than we already have.
69 while (c
!= EOF
&& c
!= '\n')
75 /* Skip white space. */
76 while (c
!= EOF
&& c
!= '\n' && isspace(c
))
79 if (c
== '\n') continue;
82 * Now grab pairs of hex digits and shove them into `data'.
86 while (c
!= EOF
&& c
!= '\n') {
88 if (c
>= 'A' && c
<= 'F')
89 hexval
= c
+ 10 - 'A';
90 if (c
>= 'a' && c
<= 'f')
91 hexval
= c
+ 10 - 'a';
92 if (c
>= '0' && c
<= '9')
96 hexdigit
= (hexdigit
<< 4) + hexval
;
98 localbuf
[i
++] = hexdigit
;
108 memcpy(data
, localbuf
, i
);
110 /* Nonetheless, continue looping round; we might find a better one. */