2 * ux_x11.c: fetch local auth data for X forwarding.
11 void platform_get_x11_auth(char *display
, int *protocol
,
12 unsigned char *data
, int *datalen
)
16 int maxsize
= *datalen
;
20 display
= x11_display(display
);
22 * Normally we should run `xauth list DISPLAYNAME'. However,
23 * there's an oddity when the display is local: the display
24 * `localhost:0' (or `:0') should become just `:0'.
26 if (!strncmp(display
, "localhost:", 10)
27 || !strncmp(display
, "unix:", 5))
28 command
= dupprintf("xauth list %s 2>/dev/null",
29 strchr(display
, ':'));
31 command
= dupprintf("xauth list %s 2>/dev/null", display
);
33 fp
= popen(command
, "r");
37 return; /* assume no auth */
39 localbuf
= snewn(maxsize
, char);
43 * Read a line from stdin, and attempt to parse it into a
44 * display name (ignored), auth protocol, and auth string.
49 /* Skip the display name. */
50 while (c
= getc(fp
), c
!= EOF
&& c
!= '\n' && !isspace(c
));
52 if (c
== '\n') continue;
54 /* Skip white space. */
55 while (c
!= EOF
&& c
!= '\n' && isspace(c
))
58 if (c
== '\n') continue;
60 /* Read the auth protocol name, and see if it matches any we
63 while (c
!= EOF
&& c
!= '\n' && !isspace(c
)) {
64 if (i
< lenof(protoname
)-1) protoname
[i
++] = c
;
69 for (i
= X11_NO_AUTH
; ++i
< X11_NAUTHS
;) {
70 if (!strcmp(protoname
, x11_authnames
[i
]))
73 if (i
>= X11_NAUTHS
|| i
<= proto
) {
74 /* Unrecognised protocol name, or a worse one than we already have.
76 while (c
!= EOF
&& c
!= '\n')
82 /* Skip white space. */
83 while (c
!= EOF
&& c
!= '\n' && isspace(c
))
86 if (c
== '\n') continue;
89 * Now grab pairs of hex digits and shove them into `data'.
93 while (c
!= EOF
&& c
!= '\n') {
95 if (c
>= 'A' && c
<= 'F')
96 hexval
= c
+ 10 - 'A';
97 if (c
>= 'a' && c
<= 'f')
98 hexval
= c
+ 10 - 'a';
99 if (c
>= '0' && c
<= '9')
103 hexdigit
= (hexdigit
<< 4) + hexval
;
105 localbuf
[i
++] = hexdigit
;
115 memcpy(data
, localbuf
, i
);
117 /* Nonetheless, continue looping round; we might find a better one. */