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/*
* Functions to manage an X11Display structure, by creating one from
* an ordinary display name string, and freeing one.
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <time.h>
#include "putty.h"
#include "ssh.h"
#include "ssh/channel.h"
#include "tree234.h"
struct X11Display *x11_setup_display(const char *display, Conf *conf,
char **error_msg)
{
struct X11Display *disp = snew(struct X11Display);
char *localcopy;
*error_msg = NULL;
if (!display || !*display) {
localcopy = platform_get_x_display();
if (!localcopy || !*localcopy) {
sfree(localcopy);
localcopy = dupstr(":0"); /* plausible default for any platform */
}
} else
localcopy = dupstr(display);
/*
* Parse the display name.
*
* We expect this to have one of the following forms:
*
* - the standard X format which looks like
* [ [ protocol '/' ] host ] ':' displaynumber [ '.' screennumber ]
* (X11 also permits a double colon to indicate DECnet, but
* that's not our problem, thankfully!)
*
* - only seen in the wild on MacOS (so far): a pathname to a
* Unix-domain socket, which will typically and confusingly
* end in ":0", and which I'm currently distinguishing from
* the standard scheme by noting that it starts with '/'.
*/
if (localcopy[0] == '/') {
disp->unixsocketpath = localcopy;
disp->unixdomain = true;
disp->hostname = NULL;
disp->displaynum = -1;
disp->screennum = 0;
disp->addr = NULL;
} else {
char *colon, *dot, *slash;
char *protocol, *hostname;
colon = host_strrchr(localcopy, ':');
if (!colon) {
*error_msg = dupprintf("display name '%s' has no ':number'"
" suffix", localcopy);
sfree(disp);
sfree(localcopy);
return NULL;
}
*colon++ = '\0';
dot = strchr(colon, '.');
if (dot)
*dot++ = '\0';
disp->displaynum = atoi(colon);
if (dot)
disp->screennum = atoi(dot);
else
disp->screennum = 0;
protocol = NULL;
hostname = localcopy;
if (colon > localcopy) {
slash = strchr(localcopy, '/');
if (slash) {
*slash++ = '\0';
protocol = localcopy;
hostname = slash;
}
}
disp->hostname = *hostname ? dupstr(hostname) : NULL;
if (protocol)
disp->unixdomain = (!strcmp(protocol, "local") ||
!strcmp(protocol, "unix"));
else if (!*hostname || !strcmp(hostname, "unix"))
disp->unixdomain = platform_uses_x11_unix_by_default;
else
disp->unixdomain = false;
if (!disp->hostname && !disp->unixdomain)
disp->hostname = dupstr("localhost");
disp->unixsocketpath = NULL;
disp->addr = NULL;
sfree(localcopy);
}
/*
* Look up the display hostname, if we need to.
*/
if (!disp->unixdomain) {
const char *err;
disp->port = 6000 + disp->displaynum;
disp->addr = name_lookup(disp->hostname, disp->port,
&disp->realhost, conf, ADDRTYPE_UNSPEC,
NULL, NULL);
if ((err = sk_addr_error(disp->addr)) != NULL) {
*error_msg = dupprintf("unable to resolve host name '%s' in "
"display name", disp->hostname);
sk_addr_free(disp->addr);
sfree(disp->hostname);
sfree(disp->unixsocketpath);
sfree(disp);
return NULL;
}
}
/*
* Try upgrading an IP-style localhost display to a Unix-socket
* display (as the standard X connection libraries do).
*/
if (!disp->unixdomain && sk_address_is_local(disp->addr)) {
SockAddr *ux = platform_get_x11_unix_address(NULL, disp->displaynum);
const char *err = sk_addr_error(ux);
if (!err) {
/* Create trial connection to see if there is a useful Unix-domain
* socket */
Socket *s = sk_new(sk_addr_dup(ux), 0, false, false,
false, false, nullplug);
err = sk_socket_error(s);
sk_close(s);
}
if (err) {
sk_addr_free(ux);
} else {
sk_addr_free(disp->addr);
disp->unixdomain = true;
disp->addr = ux;
/* Fill in the rest in a moment */
}
}
if (disp->unixdomain) {
if (!disp->addr)
disp->addr = platform_get_x11_unix_address(disp->unixsocketpath,
disp->displaynum);
if (disp->unixsocketpath)
disp->realhost = dupstr(disp->unixsocketpath);
else
disp->realhost = dupprintf("unix:%d", disp->displaynum);
disp->port = 0;
}
/*
* Fetch the local authorisation details.
*/
disp->localauthproto = X11_NO_AUTH;
disp->localauthdata = NULL;
disp->localauthdatalen = 0;
platform_get_x11_auth(disp, conf);
return disp;
}
void x11_free_display(struct X11Display *disp)
{
sfree(disp->hostname);
sfree(disp->unixsocketpath);
if (disp->localauthdata)
smemclr(disp->localauthdata, disp->localauthdatalen);
sfree(disp->localauthdata);
sk_addr_free(disp->addr);
sfree(disp);
}
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