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+/* $XdotOrg: xc/lib/X11/ConnDis.c,v 1.10 2005/07/03 07:00:55 daniels Exp $ */
+/* $Xorg: ConnDis.c,v 1.8 2001/02/09 02:03:31 xorgcvs Exp $ */
+/*
+
+Copyright 1989, 1998 The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+*/
+
+/**************************************************************************/
+/* */
+/* Copyright (c) 2001, 2011 NoMachine, http://www.nomachine.com/. */
+/* */
+/* NX-X11, NX protocol compression and NX extensions to this software */
+/* are copyright of NoMachine. Redistribution and use of the present */
+/* software is allowed according to terms specified in the file LICENSE */
+/* which comes in the source distribution. */
+/* */
+/* Check http://www.nomachine.com/licensing.html for applicability. */
+/* */
+/* NX and NoMachine are trademarks of Medialogic S.p.A. */
+/* */
+/* All rights reserved. */
+/* */
+/**************************************************************************/
+
+/* $XFree86: xc/lib/X11/ConnDis.c,v 3.28 2003/12/02 23:33:17 herrb Exp $ */
+
+/*
+ * This file contains operating system dependencies.
+ */
+
+#define NEED_EVENTS
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <X11/Xlibint.h>
+#include <X11/Xtrans/Xtrans.h>
+#include <X11/Xauth.h>
+#include <X11/Xdmcp.h>
+#include <stdio.h>
+#include <ctype.h>
+
+#if !defined(WIN32)
+#ifndef Lynx
+#include <sys/socket.h>
+#else
+#include <socket.h>
+#endif
+#else
+#include <X11/Xwindows.h>
+#endif
+
+#ifndef X_CONNECTION_RETRIES /* number retries on ECONNREFUSED */
+#define X_CONNECTION_RETRIES 5
+#endif
+
+#ifdef LOCALCONN
+#include <sys/utsname.h>
+#endif
+
+#include "Xintconn.h"
+
+/* prototypes */
+static void GetAuthorization(
+ XtransConnInfo trans_conn,
+ int family,
+ char *saddr,
+ int saddrlen,
+ int idisplay,
+ char **auth_namep,
+ int *auth_namelenp,
+ char **auth_datap,
+ int *auth_datalenp);
+
+/* functions */
+static char *copystring (char *src, int len)
+{
+ char *dst = Xmalloc (len + 1);
+
+ if (dst) {
+ strncpy (dst, src, len);
+ dst[len] = '\0';
+ }
+
+ return dst;
+}
+
+
+/*
+ * Attempts to connect to server, given display name. Returns file descriptor
+ * (network socket) or -1 if connection fails. Display names may be of the
+ * following format:
+ *
+ * [protocol/] [hostname] : [:] displaynumber [.screennumber]
+ *
+ * A string with exactly two colons seperating hostname from the display
+ * indicates a DECnet style name. Colons in the hostname may occur if an
+ * IPv6 numeric address is used as the hostname. An IPv6 numeric address
+ * may also end in a double colon, so three colons in a row indicates an
+ * IPv6 address ending in :: followed by :display. To make it easier for
+ * people to read, an IPv6 numeric address hostname may be surrounded by
+ * [ ] in a similar fashion to the IPv6 numeric address URL syntax defined
+ * by IETF RFC 2732.
+ *
+ * If no hostname and no protocol is specified, the string is interpreted
+ * as the most efficient local connection to a server on the same machine.
+ * This is usually:
+ *
+ * o shared memory
+ * o local stream
+ * o UNIX domain socket
+ * o TCP to local host
+ *
+ * This function will eventually call the X Transport Interface functions
+ * which expects the hostname in the format:
+ *
+ * [protocol/] [hostname] : [:] displaynumber
+ *
+ */
+XtransConnInfo
+_X11TransConnectDisplay (
+ char *display_name,
+ char **fullnamep, /* RETURN */
+ int *dpynump, /* RETURN */
+ int *screenp, /* RETURN */
+ char **auth_namep, /* RETURN */
+ int *auth_namelenp, /* RETURN */
+ char **auth_datap, /* RETURN */
+ int *auth_datalenp) /* RETURN */
+{
+ int family;
+ int saddrlen;
+ Xtransaddr *saddr;
+ char *lastp, *lastc, *p; /* char pointers */
+ char *pprotocol = NULL; /* start of protocol name */
+ char *phostname = NULL; /* start of host of display */
+ char *pdpynum = NULL; /* start of dpynum of display */
+ char *pscrnum = NULL; /* start of screen of display */
+ Bool dnet = False; /* if true, then DECnet format */
+ int idisplay = 0; /* required display number */
+ int iscreen = 0; /* optional screen number */
+ /* int (*connfunc)(); */ /* method to create connection */
+ int len, hostlen; /* length tmp variable */
+ int retry; /* retry counter */
+ char addrbuf[128]; /* final address passed to
+ X Transport Interface */
+ char* address = addrbuf;
+ XtransConnInfo trans_conn = NULL; /* transport connection object */
+ int connect_stat;
+#ifdef LOCALCONN
+ struct utsname sys;
+#endif
+#ifdef TCPCONN
+ char *tcphostname = NULL; /* A place to save hostname pointer */
+#endif
+
+ p = display_name;
+
+ saddrlen = 0; /* set so that we can clear later */
+ saddr = NULL;
+
+#if defined(NX_TRANS_SOCKET) && defined(NX_TRANS_TEST)
+ fprintf(stderr, "_X11TransConnectDisplay: Called with display_name [%s].\n", display_name);
+#endif
+
+#ifdef NX_TRANS_SOCKET
+
+ /*
+ * Check if user selected the "nx"
+ * protocol or an "nx" hostname.
+ */
+
+ if (!strncasecmp(p, "nx/", 3) || !strcasecmp(p, "nx") ||
+ !strncasecmp(p, "nx:", 3) || !strncasecmp(p, "nx,", 3))
+ {
+ if (*(display_name + 2) == '/')
+ {
+ p += 3;
+ }
+
+ pprotocol = copystring ("nx", 2);
+
+ if (!pprotocol) goto bad;
+
+#ifdef NX_TRANS_TEST
+ fprintf(stderr, "_X11TransConnectDisplay: Forced protocol to [%s].\n", pprotocol);
+#endif
+
+ }
+ else
+ {
+
+#endif
+
+ /*
+ * Step 0, find the protocol. This is delimited by the optional
+ * slash ('/').
+ */
+ for (lastp = p; *p && *p != ':' && *p != '/'; p++) ;
+ if (!*p) return NULL; /* must have a colon */
+
+ if (p != lastp && *p != ':') { /* protocol given? */
+ pprotocol = copystring (lastp, p - lastp);
+ if (!pprotocol) goto bad; /* no memory */
+ p++; /* skip the '/' */
+ } else
+ p = display_name; /* reset the pointer in
+ case no protocol was given */
+#ifdef NX_TRANS_SOCKET
+
+ } /* End of step 0. */
+
+ /*
+ * Check if user specified the "nx" protocol or
+ * hostname is "nx" or in the form "nx,...".
+ */
+
+ if (pprotocol && !strcasecmp(pprotocol, "nx"))
+ {
+
+#ifdef NX_TRANS_TEST
+ fprintf(stderr, "_X11TransConnectDisplay: Checking hostname [%s].\n", p);
+#endif
+
+ /*
+ * Options can include a "display=" tuple so
+ * need to scan right to left.
+ */
+
+ lastp = p;
+ lastc = NULL;
+
+ for (; *p; p++)
+ if (*p == ':')
+ lastc = p;
+
+ /*
+ * Don't complain if no screen was provided.
+ */
+
+ if (lastc)
+ {
+ phostname = copystring (lastp, lastc - lastp);
+
+ p = lastc;
+ }
+ else
+ {
+ phostname = copystring (lastp, strlen(lastp));
+ }
+
+ if (!phostname) goto bad;
+
+#ifdef NX_TRANS_TEST
+ fprintf(stderr, "_X11TransConnectDisplay: Forced hostname [%s].\n", phostname);
+#endif
+
+ }
+ else
+ {
+
+#endif
+
+ /*
+ * Step 1, find the hostname. This is delimited by either one colon,
+ * or two colons in the case of DECnet (DECnet Phase V allows a single
+ * colon in the hostname). (See note above regarding IPv6 numeric
+ * addresses with triple colons or [] brackets.)
+ */
+
+ lastp = p;
+ lastc = NULL;
+ for (; *p; p++)
+ if (*p == ':')
+ lastc = p;
+
+ if (!lastc) return NULL; /* must have a colon */
+
+ if ((lastp != lastc) && (*(lastc - 1) == ':')
+#if defined(IPv6) && defined(AF_INET6)
+ && ( ((lastc - 1) == lastp) || (*(lastc - 2) != ':'))
+#endif
+ ) {
+ /* DECnet display specified */
+
+#ifndef DNETCONN
+ goto bad;
+#else
+ dnet = True;
+ /* override the protocol specified */
+ if (pprotocol)
+ Xfree (pprotocol);
+ pprotocol = copystring ("dnet", 4);
+ hostlen = lastc - 1 - lastp;
+#endif
+ }
+ else
+ hostlen = lastc - lastp;
+
+ if (hostlen > 0) { /* hostname given? */
+ phostname = copystring (lastp, hostlen);
+ if (!phostname) goto bad; /* no memory */
+ }
+
+ p = lastc;
+
+#ifdef LOCALCONN
+ /* check if phostname == localnodename AND protocol not specified */
+ if (!pprotocol && phostname && uname(&sys) >= 0 &&
+ !strncmp(phostname, sys.nodename,
+ (strlen(sys.nodename) < strlen(phostname) ?
+ strlen(phostname) : strlen(sys.nodename))))
+ {
+#ifdef TCPCONN
+ /*
+ * We'll first attempt to connect using the local transport. If
+ * this fails (which is the case if sshd X protocol forwarding is
+ * being used), retry using tcp and this hostname.
+ */
+ tcphostname = copystring(phostname, strlen(phostname));
+#endif
+ Xfree (phostname);
+ phostname = copystring ("unix", 4);
+ }
+#endif
+
+#ifdef NX_TRANS_SOCKET
+
+ } /* End of step 1. */
+
+ /*
+ * Check if no display was specified. In this case
+ * search the "port=n" option in NX host string.
+ */
+
+ if (*p)
+ {
+
+#endif
+
+
+ /*
+ * Step 2, find the display number. This field is required and is
+ * delimited either by a nul or a period, depending on whether or not
+ * a screen number is present.
+ */
+
+ for (lastp = ++p; *p && isascii(*p) && isdigit(*p); p++) ;
+ if ((p == lastp) || /* required field */
+ (*p != '\0' && *p != '.') || /* invalid non-digit terminator */
+ !(pdpynum = copystring (lastp, p - lastp))) /* no memory */
+ goto bad;
+ idisplay = atoi (pdpynum);
+
+#ifdef NX_TRANS_SOCKET
+
+ }
+ else
+ {
+ char *host = NULL;
+ char *name = NULL;
+ char *value = NULL;
+
+#ifdef NX_TRANS_TEST
+ fprintf(stderr, "_X11TransConnectDisplay: Searching port in port [%s].\n", phostname);
+#endif
+
+ if (!strncasecmp(phostname, "nx,", 3))
+ {
+ host = copystring(phostname + 3, strlen(phostname) - 3);
+ }
+
+ if (!host) goto bad;
+
+ idisplay = -1;
+
+ name = strtok(host, "=");
+
+ while (name)
+ {
+ value = strtok(NULL, ",");
+
+ if (value == NULL || strstr(value, "=") != NULL ||
+ strstr(name, ",") != NULL || strlen(value) >= 128)
+ {
+ Xfree(host);
+
+ goto bad;
+ }
+ else if (strcasecmp(name, "port") == 0)
+ {
+ idisplay = atoi(value);
+
+ pdpynum = copystring(value, strlen(value));
+
+ if (!pdpynum) goto bad;
+
+ break;
+ }
+
+ name = strtok(NULL, "=");
+ }
+
+ Xfree(host);
+
+ if (idisplay == -1)
+ {
+ goto bad;
+ }
+
+ } /* End of step 2. */
+
+#endif
+
+
+ /*
+ * Step 3, find the screen number. This field is optional. It is
+ * present only if the display number was followed by a period (which
+ * we've already verified is the only non-nul character).
+ */
+
+ if (*p) {
+ for (lastp = ++p; *p && isascii(*p) && isdigit (*p); p++) ;
+ if (p != lastp) {
+ if (*p || /* non-digits */
+ !(pscrnum = copystring (lastp, p - lastp))) /* no memory */
+ goto bad;
+ iscreen = atoi (lastp);
+ }
+ }
+
+ /*
+ * At this point, we know the following information:
+ *
+ * pprotocol protocol string or NULL
+ * phostname hostname string or NULL
+ * idisplay display number
+ * iscreen screen number
+ * dnet DECnet boolean
+ *
+ * We can now decide which transport to use based on the ConnectionFlags
+ * build parameter the hostname string. If phostname is NULL or equals
+ * the string "local", then choose the best transport. If phostname
+ * is "unix", then choose BSD UNIX domain sockets (if configured).
+ */
+
+#ifdef NX_TRANS_SOCKET
+
+ /*
+ * If user selected the "nx" protocol
+ * force "local" transport.
+ */
+
+ if (pprotocol && !strcasecmp(pprotocol, "nx"))
+ {
+ pprotocol = copystring ("local", 5);
+
+ if (!pprotocol) goto bad;
+
+#ifdef NX_TRANS_TEST
+ fprintf(stderr, "_X11TransConnectDisplay: Converted protocol to [%s].\n", pprotocol);
+#endif
+
+ }
+
+#endif
+
+#if defined(TCPCONN) || defined(UNIXCONN) || defined(LOCALCONN) || defined(MNX_TCPCONN) || defined(OS2PIPECONN)
+ if (!pprotocol) {
+ if (!phostname) {
+#if defined(UNIXCONN) || defined(LOCALCONN) || defined(OS2PIPECONN)
+ pprotocol = copystring ("local", 5);
+#if defined(TCPCONN)
+ tcphostname = copystring("localhost", 9);
+#endif
+ }
+ else
+ {
+#endif
+ pprotocol = copystring ("tcp", 3);
+ }
+ }
+#endif
+
+#if defined(UNIXCONN) || defined(LOCALCONN) || defined(OS2PIPECONN)
+ /*
+ * Now that the defaults have been established, see if we have any
+ * special names that we have to override:
+ *
+ * :N => if UNIXCONN then unix-domain-socket
+ * ::N => if UNIXCONN then unix-domain-socket
+ * unix:N => if UNIXCONN then unix-domain-socket
+ *
+ * Note that if UNIXCONN isn't defined, then we can use the default
+ * transport connection function set above.
+ */
+
+ if (!phostname) {
+#ifdef apollo
+ ; /* Unix domain sockets are *really* bad on apollos */
+#else
+ if( pprotocol ) Xfree(pprotocol);
+ pprotocol = copystring ("local", 5);
+#endif
+ }
+ else if (strcmp (phostname, "unix") == 0) {
+ if( pprotocol ) Xfree(pprotocol);
+ pprotocol = copystring ("local", 5);
+ }
+#endif
+
+#if defined(TCPCONN)
+ connect:
+#endif
+ /*
+ * This seems kind of backwards, but we need to put the protocol,
+ * host, and port back together to pass to _X11TransOpenCOTSClient().
+ */
+
+ {
+ int olen = 3 + (pprotocol ? strlen(pprotocol) : 0) +
+ (phostname ? strlen(phostname) : 0) +
+ (pdpynum ? strlen(pdpynum) : 0);
+ if (olen > sizeof addrbuf) address = Xmalloc (olen);
+ }
+ if (!address) goto bad;
+
+ sprintf(address,"%s/%s:%d",
+ pprotocol ? pprotocol : "",
+ phostname ? phostname : "",
+ idisplay );
+
+ /*
+ * Make the connection, also need to get the auth address info for
+ * the connection. Do retries in case server host has hit its
+ * backlog (which, unfortunately, isn't distinguishable from there not
+ * being a server listening at all, which is why we have to not retry
+ * too many times).
+ */
+#if defined(NX_TRANS_SOCKET) && defined(NX_TRANS_TEST)
+ fprintf(stderr, "_X11TransConnectDisplay: Entering connection loop.\n");
+#endif
+ for(retry=X_CONNECTION_RETRIES; retry>=0; retry-- )
+ {
+#if defined(NX_TRANS_SOCKET) && defined(NX_TRANS_TEST)
+ fprintf(stderr, "_X11TransConnectDisplay: Going to call _X11TransOpenCOTSClient(address) with address [%s].\n", address);
+#endif
+ if ( (trans_conn = _X11TransOpenCOTSClient(address)) == NULL )
+ {
+ break;
+ }
+#if defined(NX_TRANS_SOCKET) && defined(NX_TRANS_TEST)
+ fprintf(stderr, "_X11TransConnectDisplay: Going to call _X11TransConnect(trans_conn,address).\n");
+#endif
+ if ((connect_stat = _X11TransConnect(trans_conn,address)) < 0 )
+ {
+#if defined(NX_TRANS_SOCKET) && defined(NX_TRANS_TEST)
+ fprintf(stderr, "_X11TransConnectDisplay: Going to call _X11TransClose(trans_conn).\n");
+#endif
+ _X11TransClose(trans_conn);
+ trans_conn = NULL;
+
+ if (connect_stat == TRANS_TRY_CONNECT_AGAIN)
+ {
+ sleep(1);
+ continue;
+ }
+ else
+ break;
+ }
+
+#if defined(NX_TRANS_SOCKET) && defined(NX_TRANS_TEST)
+ fprintf(stderr, "_X11TransConnectDisplay: Going to call _X11TransGetPeerAddr(trans_conn, &family, &saddrlen, &saddr).\n");
+#endif
+ _X11TransGetPeerAddr(trans_conn, &family, &saddrlen, &saddr);
+
+ /*
+ * The family is given in a socket format (ie AF_INET). This
+ * will convert it to the format used by the authorization and
+ * X protocol (ie FamilyInternet).
+ */
+
+#if defined(NX_TRANS_SOCKET) && defined(NX_TRANS_TEST)
+ fprintf(stderr, "_X11TransConnectDisplay: Going to call _X11TransConvertAddress(&family, &saddrlen, &saddr).\n");
+#endif
+ if( _X11TransConvertAddress(&family, &saddrlen, &saddr) < 0 )
+ {
+ _X11TransClose(trans_conn);
+ trans_conn = NULL;
+ sleep(1);
+ if (saddr)
+ {
+ free ((char *) saddr);
+ saddr = NULL;
+ }
+ continue;
+ }
+
+ break;
+ }
+
+#if defined(NX_TRANS_SOCKET) && defined(NX_TRANS_TEST)
+ fprintf(stderr, "_X11TransConnectDisplay: Out of connection loop.\n");
+#endif
+ if (address != addrbuf) Xfree (address);
+ address = addrbuf;
+
+ if( trans_conn == NULL )
+ goto bad;
+
+ /*
+ * Set close-on-exec so that programs that fork() doesn't get confused.
+ */
+
+ _X11TransSetOption(trans_conn,TRANS_CLOSEONEXEC,1);
+
+ /*
+ * Build the expanded display name:
+ *
+ * [host] : [:] dpy . scr \0
+ */
+ len = ((phostname ? strlen(phostname) : 0) + 1 + (dnet ? 1 : 0) +
+ strlen(pdpynum) + 1 + (pscrnum ? strlen(pscrnum) : 1) + 1);
+ *fullnamep = (char *) Xmalloc (len);
+ if (!*fullnamep) goto bad;
+
+ sprintf (*fullnamep, "%s%s%d.%d",
+ (phostname ? phostname : ""),
+ (dnet ? "::" : ":"),
+ idisplay, iscreen);
+
+ *dpynump = idisplay;
+ *screenp = iscreen;
+ if (pprotocol) Xfree (pprotocol);
+ if (phostname) Xfree (phostname);
+ if (pdpynum) Xfree (pdpynum);
+ if (pscrnum) Xfree (pscrnum);
+#ifdef TCPCONN
+ if (tcphostname) Xfree (tcphostname);
+#endif
+
+ GetAuthorization(trans_conn, family, (char *) saddr, saddrlen, idisplay,
+ auth_namep, auth_namelenp, auth_datap, auth_datalenp);
+ return trans_conn;
+
+
+ /*
+ * error return; make sure everything is cleaned up.
+ */
+ bad:
+ if (trans_conn) (void)_X11TransClose(trans_conn);
+ if (saddr) free ((char *) saddr);
+ if (pprotocol) Xfree (pprotocol);
+ if (phostname) Xfree (phostname);
+ if (address && address != addrbuf) { Xfree(address); address = addrbuf; }
+
+#if defined(TCPCONN)
+ if (tcphostname) {
+ pprotocol = copystring("tcp", 3);
+ phostname = tcphostname;
+ tcphostname = NULL;
+ goto connect;
+ }
+#endif
+
+ if (pdpynum) Xfree (pdpynum);
+ if (pscrnum) Xfree (pscrnum);
+ return NULL;
+
+}
+
+/*
+ * This is gross, but we need it for compatiblity.
+ * The test suite relies on the following interface.
+ *
+ */
+
+int _XConnectDisplay (
+ char *display_name,
+ char **fullnamep, /* RETURN */
+ int *dpynump, /* RETURN */
+ int *screenp, /* RETURN */
+ char **auth_namep, /* RETURN */
+ int *auth_namelenp, /* RETURN */
+ char **auth_datap, /* RETURN */
+ int *auth_datalenp) /* RETURN */
+{
+ XtransConnInfo trans_conn;
+
+ trans_conn = _X11TransConnectDisplay (
+ display_name, fullnamep, dpynump, screenp,
+ auth_namep, auth_namelenp, auth_datap, auth_datalenp);
+
+ if (trans_conn)
+ {
+ int fd = _X11TransGetConnectionNumber (trans_conn);
+ _X11TransFreeConnInfo (trans_conn);
+ return (fd);
+ }
+ else
+ return (-1);
+}
+
+
+/*****************************************************************************
+ * *
+ * Connection Utility Routines *
+ * *
+ *****************************************************************************/
+
+/*
+ * Disconnect from server.
+ */
+
+int _XDisconnectDisplay (trans_conn)
+
+XtransConnInfo trans_conn;
+
+{
+ _X11TransDisconnect(trans_conn);
+ _X11TransClose(trans_conn);
+ return 0;
+}
+
+
+
+Bool
+_XSendClientPrefix (dpy, client, auth_proto, auth_string, prefix)
+ Display *dpy;
+ xConnClientPrefix *client; /* contains count for auth_* */
+ char *auth_proto, *auth_string; /* NOT null-terminated */
+ xConnSetupPrefix *prefix; /* prefix information */
+{
+ int auth_length = client->nbytesAuthProto;
+ int auth_strlen = client->nbytesAuthString;
+ static char padbuf[3]; /* for padding to 4x bytes */
+ int pad;
+ struct iovec iovarray[5], *iov = iovarray;
+ int niov = 0;
+ int len = 0;
+
+#define add_to_iov(b,l) \
+ { iov->iov_base = (b); iov->iov_len = (l); iov++, niov++; len += (l); }
+
+ add_to_iov ((caddr_t) client, SIZEOF(xConnClientPrefix));
+
+ /*
+ * write authorization protocol name and data
+ */
+ if (auth_length > 0) {
+ add_to_iov (auth_proto, auth_length);
+ pad = -auth_length & 3; /* pad auth_length to a multiple of 4 */
+ if (pad) add_to_iov (padbuf, pad);
+ }
+ if (auth_strlen > 0) {
+ add_to_iov (auth_string, auth_strlen);
+ pad = -auth_strlen & 3; /* pad auth_strlen to a multiple of 4 */
+ if (pad) add_to_iov (padbuf, pad);
+ }
+
+#undef add_to_iov
+
+ len -= _X11TransWritev (dpy->trans_conn, iovarray, niov);
+
+ /*
+ * Set the connection non-blocking since we use select() to block.
+ */
+
+ _X11TransSetOption(dpy->trans_conn, TRANS_NONBLOCKING, 1);
+
+ if (len != 0)
+ return -1;
+#ifdef NX_TRANS_SOCKET
+ if (_NXDisplayWriteFunction != NULL) {
+ (*_NXDisplayWriteFunction)(dpy, len);
+ }
+#ifdef NX_TRANS_CHANGE
+ if (_NXDisplayCongestionFunction != NULL &&
+ _X11TransSocketCongestionChange(dpy->trans_conn, &congestion) == 1) {
+ (*_NXDisplayCongestionFunction)(dpy, congestion);
+ }
+#endif
+#endif
+
+#ifdef K5AUTH
+ if (auth_length == 14 &&
+ !strncmp(auth_proto, "MIT-KERBEROS-5", 14))
+ {
+ return k5_clientauth(dpy, prefix);
+ } else
+#endif
+ return 0;
+}
+
+
+#ifdef STREAMSCONN
+#ifdef SVR4
+#include <tiuser.h>
+#else
+#undef HASXDMAUTH
+#endif
+#endif
+
+#ifdef SECURE_RPC
+#include <rpc/rpc.h>
+#ifdef ultrix
+#include <time.h>
+#include <rpc/auth_des.h>
+#endif
+#endif
+
+#ifdef HASXDMAUTH
+#include <time.h>
+#define Time_t time_t
+#endif
+
+/*
+ * First, a routine for setting authorization data
+ */
+static int xauth_namelen = 0;
+static char *xauth_name = NULL; /* NULL means use default mechanism */
+static int xauth_datalen = 0;
+static char *xauth_data = NULL; /* NULL means get default data */
+
+/*
+ * This is a list of the authorization names which Xlib currently supports.
+ * Xau will choose the file entry which matches the earliest entry in this
+ * array, allowing us to prioritize these in terms of the most secure first
+ */
+
+static char *default_xauth_names[] = {
+#ifdef K5AUTH
+ "MIT-KERBEROS-5",
+#endif
+#ifdef SECURE_RPC
+ "SUN-DES-1",
+#endif
+#ifdef HASXDMAUTH
+ "XDM-AUTHORIZATION-1",
+#endif
+ "MIT-MAGIC-COOKIE-1"
+};
+
+static _Xconst int default_xauth_lengths[] = {
+#ifdef K5AUTH
+ 14, /* strlen ("MIT-KERBEROS-5") */
+#endif
+#ifdef SECURE_RPC
+ 9, /* strlen ("SUN-DES-1") */
+#endif
+#ifdef HASXDMAUTH
+ 19, /* strlen ("XDM-AUTHORIZATION-1") */
+#endif
+ 18 /* strlen ("MIT-MAGIC-COOKIE-1") */
+};
+
+#define NUM_DEFAULT_AUTH (sizeof (default_xauth_names) / sizeof (default_xauth_names[0]))
+
+static char **xauth_names = default_xauth_names;
+static _Xconst int *xauth_lengths = default_xauth_lengths;
+
+static int xauth_names_length = NUM_DEFAULT_AUTH;
+
+void XSetAuthorization (name, namelen, data, datalen)
+ int namelen, datalen; /* lengths of name and data */
+ char *name, *data; /* NULL or arbitrary array of bytes */
+{
+ char *tmpname, *tmpdata;
+
+ _XLockMutex(_Xglobal_lock);
+ if (xauth_name) Xfree (xauth_name); /* free any existing data */
+ if (xauth_data) Xfree (xauth_data);
+
+ xauth_name = xauth_data = NULL; /* mark it no longer valid */
+ xauth_namelen = xauth_datalen = 0;
+ _XUnlockMutex(_Xglobal_lock);
+
+ if (namelen < 0) namelen = 0; /* check for bogus inputs */
+ if (datalen < 0) datalen = 0; /* maybe should return? */
+
+ if (namelen > 0) { /* try to allocate space */
+ tmpname = Xmalloc ((unsigned) namelen);
+ if (!tmpname) return;
+ memcpy (tmpname, name, namelen);
+ } else {
+ tmpname = NULL;
+ }
+
+ if (datalen > 0) {
+ tmpdata = Xmalloc ((unsigned) datalen);
+ if (!tmpdata) {
+ if (tmpname) (void) Xfree (tmpname);
+ return;
+ }
+ memcpy (tmpdata, data, datalen);
+ } else {
+ tmpdata = NULL;
+ }
+
+ _XLockMutex(_Xglobal_lock);
+ xauth_name = tmpname; /* and store the suckers */
+ xauth_namelen = namelen;
+ if (tmpname)
+ {
+ xauth_names = &xauth_name;
+ xauth_lengths = &xauth_namelen;
+ xauth_names_length = 1;
+ }
+ else
+ {
+ xauth_names = default_xauth_names;
+ xauth_lengths = default_xauth_lengths;
+ xauth_names_length = NUM_DEFAULT_AUTH;
+ }
+ xauth_data = tmpdata;
+ xauth_datalen = datalen;
+ _XUnlockMutex(_Xglobal_lock);
+ return;
+}
+
+#ifdef SECURE_RPC
+/*
+ * Create a credential that we can send to the X server.
+ */
+static int
+auth_ezencode(servername, window, cred_out, len)
+ char *servername;
+ int window;
+ char *cred_out;
+ int *len;
+{
+ AUTH *a;
+ XDR xdr;
+
+#if defined(SVR4) && defined(sun)
+ a = authdes_seccreate(servername, window, NULL, NULL);
+#else
+ a = (AUTH *)authdes_create(servername, window, NULL, NULL);
+#endif
+ if (a == (AUTH *)NULL) {
+ perror("auth_create");
+ return 0;
+ }
+ xdrmem_create(&xdr, cred_out, *len, XDR_ENCODE);
+ if (AUTH_MARSHALL(a, &xdr) == FALSE) {
+ perror("auth_marshall");
+ AUTH_DESTROY(a);
+ return 0;
+ }
+ *len = xdr_getpos(&xdr);
+ AUTH_DESTROY(a);
+ return 1;
+}
+#endif
+
+#ifdef K5AUTH
+#include <com_err.h>
+
+extern krb5_flags krb5_kdc_default_options;
+
+/*
+ * k5_clientauth
+ *
+ * Returns non-zero if the setup prefix has been read,
+ * so we can tell XOpenDisplay to not bother looking for it by
+ * itself.
+ */
+static int k5_clientauth(dpy, sprefix)
+ Display *dpy;
+ xConnSetupPrefix *sprefix;
+{
+ krb5_error_code retval;
+ xReq prefix;
+ char *buf;
+ CARD16 plen, tlen;
+ krb5_data kbuf;
+ krb5_ccache cc;
+ krb5_creds creds;
+ krb5_principal cprinc, sprinc;
+ krb5_ap_rep_enc_part *repl;
+
+ krb5_init_ets();
+ /*
+ * stage 0: get encoded principal and tgt from server
+ */
+ _XRead(dpy, (char *)&prefix, sz_xReq);
+ if (prefix.reqType != 2 && prefix.reqType != 3)
+ /* not an auth packet... so deal */
+ if (prefix.reqType == 0 || prefix.reqType == 1)
+ {
+ memcpy((char *)sprefix, (char *)&prefix, sz_xReq);
+ _XRead(dpy, (char *)sprefix + sz_xReq,
+ sz_xConnSetupPrefix - sz_xReq); /* ewww... gross */
+ return 1;
+ }
+ else
+ {
+ fprintf(stderr,
+ "Xlib: Krb5 stage 0: got illegal connection setup success code %d\n",
+ prefix.reqType);
+ return -1;
+ }
+ if (prefix.data != 0)
+ {
+ fprintf(stderr, "Xlib: got out of sequence (%d) packet in Krb5 auth\n",
+ prefix.data);
+ return -1;
+ }
+ buf = (char *)malloc((prefix.length << 2) - sz_xReq);
+ if (buf == NULL) /* malloc failed. Run away! */
+ {
+ fprintf(stderr, "Xlib: malloc bombed in Krb5 auth\n");
+ return -1;
+ }
+ tlen = (prefix.length << 2) - sz_xReq;
+ _XRead(dpy, buf, tlen);
+ if (prefix.reqType == 2 && tlen < 6)
+ {
+ fprintf(stderr, "Xlib: Krb5 stage 0 reply from server too short\n");
+ free(buf);
+ return -1;
+ }
+ if (prefix.reqType == 2)
+ {
+ plen = *(CARD16 *)buf;
+ kbuf.data = buf + 2;
+ kbuf.length = (plen > tlen) ? tlen : plen;
+ }
+ else
+ {
+ kbuf.data = buf;
+ kbuf.length = tlen;
+ }
+ if (XauKrb5Decode(kbuf, &sprinc))
+ {
+ free(buf);
+ fprintf(stderr, "Xlib: XauKrb5Decode bombed\n");
+ return -1;
+ }
+ if (prefix.reqType == 3) /* do some special stuff here */
+ {
+ char *sname, *hostname = NULL;
+
+ sname = (char *)malloc(krb5_princ_component(sprinc, 0)->length + 1);
+ if (sname == NULL)
+ {
+ free(buf);
+ krb5_free_principal(sprinc);
+ fprintf(stderr, "Xlib: malloc bombed in Krb5 auth\n");
+ return -1;
+ }
+ memcpy(sname, krb5_princ_component(sprinc, 0)->data,
+ krb5_princ_component(sprinc, 0)->length);
+ sname[krb5_princ_component(sprinc, 0)->length] = '\0';
+ krb5_free_principal(sprinc);
+ if (dpy->display_name[0] != ':') /* hunt for a hostname */
+ {
+ char *t;
+
+ if ((hostname = (char *)malloc(strlen(dpy->display_name)))
+ == NULL)
+ {
+ free(buf);
+ free(sname);
+ fprintf(stderr, "Xlib: malloc bombed in Krb5 auth\n");
+ return -1;
+ }
+ strcpy(hostname, dpy->display_name);
+ t = strchr(hostname, ':');
+ if (t == NULL)
+ {
+ free(buf);
+ free(sname);
+ free(hostname);
+ fprintf(stderr,
+ "Xlib: shouldn't get here! malformed display name.");
+ return -1;
+ }
+ if ((t - hostname + 1 < strlen(hostname)) && t[1] == ':')
+ t++;
+ *t = '\0'; /* truncate the dpy number out */
+ }
+ retval = krb5_sname_to_principal(hostname, sname,
+ KRB5_NT_SRV_HST, &sprinc);
+ free(sname);
+ if (hostname)
+ free(hostname);
+ if (retval)
+ {
+ free(buf);
+ fprintf(stderr, "Xlib: krb5_sname_to_principal failed: %s\n",
+ error_message(retval));
+ return -1;
+ }
+ }
+ if (retval = krb5_cc_default(&cc))
+ {
+ free(buf);
+ krb5_free_principal(sprinc);
+ fprintf(stderr, "Xlib: krb5_cc_default failed: %s\n",
+ error_message(retval));
+ return -1;
+ }
+ if (retval = krb5_cc_get_principal(cc, &cprinc))
+ {
+ free(buf);
+ krb5_free_principal(sprinc);
+ fprintf(stderr, "Xlib: cannot get Kerberos principal from \"%s\": %s\n",
+ krb5_cc_default_name(), error_message(retval));
+ return -1;
+ }
+ bzero((char *)&creds, sizeof(creds));
+ creds.server = sprinc;
+ creds.client = cprinc;
+ if (prefix.reqType == 2)
+ {
+ creds.second_ticket.length = tlen - plen - 2;
+ creds.second_ticket.data = buf + 2 + plen;
+ retval = krb5_get_credentials(KRB5_GC_USER_USER |
+ krb5_kdc_default_options,
+ cc, &creds);
+ }
+ else
+ retval = krb5_get_credentials(krb5_kdc_default_options,
+ cc, &creds);
+ if (retval)
+ {
+ free(buf);
+ krb5_free_cred_contents(&creds);
+ fprintf(stderr, "Xlib: cannot get Kerberos credentials: %s\n",
+ error_message(retval));
+ return -1;
+ }
+ /*
+ * now format the ap_req to send to the server
+ */
+ if (prefix.reqType == 2)
+ retval = krb5_mk_req_extended(AP_OPTS_USE_SESSION_KEY |
+ AP_OPTS_MUTUAL_REQUIRED, NULL,
+ 0, 0, NULL, cc,
+ &creds, NULL, &kbuf);
+ else
+ retval = krb5_mk_req_extended(AP_OPTS_MUTUAL_REQUIRED, NULL,
+ 0, 0, NULL, cc, &creds, NULL,
+ &kbuf);
+ free(buf);
+ if (retval) /* Some manner of Kerberos lossage */
+ {
+ krb5_free_cred_contents(&creds);
+ fprintf(stderr, "Xlib: krb5_mk_req_extended failed: %s\n",
+ error_message(retval));
+ return -1;
+ }
+ prefix.reqType = 1;
+ prefix.data = 0;
+ prefix.length = (kbuf.length + sz_xReq + 3) >> 2;
+ /*
+ * stage 1: send ap_req to server
+ */
+ _XSend(dpy, (char *)&prefix, sz_xReq);
+ _XSend(dpy, (char *)kbuf.data, kbuf.length);
+ free(kbuf.data);
+ /*
+ * stage 2: get ap_rep from server to mutually authenticate
+ */
+ _XRead(dpy, (char *)&prefix, sz_xReq);
+ if (prefix.reqType != 2)
+ if (prefix.reqType == 0 || prefix.reqType == 1)
+ {
+ memcpy((char *)sprefix, (char *)&prefix, sz_xReq);
+ _XRead(dpy, (char *)sprefix + sz_xReq,
+ sz_xConnSetupPrefix - sz_xReq);
+ return 1;
+ }
+ else
+ {
+ fprintf(stderr,
+ "Xlib: Krb5 stage 2: got illegal connection setup success code %d\n",
+ prefix.reqType);
+ return -1;
+ }
+ if (prefix.data != 2)
+ return -1;
+ kbuf.length = (prefix.length << 2) - sz_xReq;
+ kbuf.data = (char *)malloc(kbuf.length);
+ if (kbuf.data == NULL)
+ {
+ fprintf(stderr, "Xlib: malloc bombed in Krb5 auth\n");
+ return -1;
+ }
+ _XRead(dpy, (char *)kbuf.data, kbuf.length);
+ retval = krb5_rd_rep(&kbuf, &creds.keyblock, &repl);
+ if (retval)
+ {
+ free(kbuf.data);
+ fprintf(stderr, "Xlib: krb5_rd_rep failed: %s\n",
+ error_message(retval));
+ return -1;
+ }
+ free(kbuf.data);
+ /*
+ * stage 3: send a short ack to the server and return
+ */
+ prefix.reqType = 3;
+ prefix.data = 0;
+ prefix.length = sz_xReq >> 2;
+ _XSend(dpy, (char *)&prefix, sz_xReq);
+ return 0;
+}
+#endif /* K5AUTH */
+
+static void
+GetAuthorization(
+ XtransConnInfo trans_conn,
+ int family,
+ char *saddr,
+ int saddrlen,
+ int idisplay,
+ char **auth_namep, /* RETURN */
+ int *auth_namelenp, /* RETURN */
+ char **auth_datap, /* RETURN */
+ int *auth_datalenp) /* RETURN */
+{
+#ifdef SECURE_RPC
+ char rpc_cred[MAX_AUTH_BYTES];
+#endif
+#ifdef HASXDMAUTH
+ unsigned char xdmcp_data[192/8];
+#endif
+ char *auth_name;
+ int auth_namelen;
+ unsigned char *auth_data;
+ int auth_datalen;
+ Xauth *authptr = NULL;
+
+/*
+ * Look up the authorization protocol name and data if necessary.
+ */
+ if (xauth_name && xauth_data) {
+ auth_namelen = xauth_namelen;
+ auth_name = xauth_name;
+ auth_datalen = xauth_datalen;
+ auth_data = (unsigned char *) xauth_data;
+ } else {
+ char dpynumbuf[40]; /* big enough to hold 2^64 and more */
+ (void) sprintf (dpynumbuf, "%d", idisplay);
+
+ authptr = XauGetBestAuthByAddr ((unsigned short) family,
+ (unsigned short) saddrlen,
+ saddr,
+ (unsigned short) strlen (dpynumbuf),
+ dpynumbuf,
+ xauth_names_length,
+ xauth_names,
+ xauth_lengths);
+ if (authptr) {
+ auth_namelen = authptr->name_length;
+ auth_name = (char *)authptr->name;
+ auth_datalen = authptr->data_length;
+ auth_data = (unsigned char *) authptr->data;
+ } else {
+ auth_namelen = 0;
+ auth_name = NULL;
+ auth_datalen = 0;
+ auth_data = NULL;
+ }
+ }
+#ifdef HASXDMAUTH
+ /*
+ * build XDM-AUTHORIZATION-1 data
+ */
+ if (auth_namelen == 19 && !strncmp (auth_name, "XDM-AUTHORIZATION-1", 19))
+ {
+ int i, j;
+ Time_t now;
+ int family, addrlen;
+ Xtransaddr *addr = NULL;
+
+ for (j = 0; j < 8; j++)
+ xdmcp_data[j] = auth_data[j];
+
+ _X11TransGetMyAddr(trans_conn, &family, &addrlen, &addr);
+
+ switch( family )
+ {
+#ifdef AF_INET
+ case AF_INET:
+ {
+ /*
+ * addr will contain a sockaddr_in with all
+ * of the members already in network byte order.
+ */
+
+ for(i=4; i<8; i++) /* do sin_addr */
+ xdmcp_data[j++] = ((char *)addr)[i];
+ for(i=2; i<4; i++) /* do sin_port */
+ xdmcp_data[j++] = ((char *)addr)[i];
+ break;
+ }
+#endif /* AF_INET */
+#if defined(IPv6) && defined(AF_INET6)
+ case AF_INET6:
+ /* XXX This should probably never happen */
+ {
+ unsigned char ipv4mappedprefix[] = {
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff };
+
+ /* In the case of v4 mapped addresses send the v4
+ part of the address - addr is already in network byte order */
+ if (memcmp(addr+8, ipv4mappedprefix, 12) == 0) {
+ for (i = 20 ; i < 24; i++)
+ xdmcp_data[j++] = ((char *)addr)[i];
+
+ /* Port number */
+ for (i=2; i<4; i++)
+ xdmcp_data[j++] = ((char *)addr)[i];
+ } else {
+ /* Fake data to keep the data aligned. Otherwise the
+ the server will bail about incorrect timing data */
+ for (i = 0; i < 6; i++) {
+ xdmcp_data[j++] = 0;
+ }
+ }
+ break;
+ }
+#endif /* AF_INET6 */
+#ifdef AF_UNIX
+ case AF_UNIX:
+ {
+ /*
+ * We don't use the sockaddr_un for this encoding.
+ * Instead, we create a sockaddr_in filled with
+ * a decreasing counter for the address, and the
+ * pid for the port.
+ */
+
+ static unsigned long unix_addr = 0xFFFFFFFF;
+ unsigned long the_addr;
+ unsigned short the_port;
+ unsigned long the_utime;
+ struct timeval tp;
+
+ X_GETTIMEOFDAY(&tp);
+ _XLockMutex(_Xglobal_lock);
+ the_addr = unix_addr--;
+ _XUnlockMutex(_Xglobal_lock);
+ the_utime = (unsigned long) tp.tv_usec;
+ the_port = getpid ();
+
+ xdmcp_data[j++] = (the_utime >> 24) & 0xFF;
+ xdmcp_data[j++] = (the_utime >> 16) & 0xFF;
+ xdmcp_data[j++] = ((the_utime >> 8) & 0xF0)
+ | ((the_addr >> 8) & 0x0F);
+ xdmcp_data[j++] = (the_addr >> 0) & 0xFF;
+ xdmcp_data[j++] = (the_port >> 8) & 0xFF;
+ xdmcp_data[j++] = (the_port >> 0) & 0xFF;
+ break;
+ }
+#endif /* AF_UNIX */
+#ifdef AF_DECnet
+ case AF_DECnet:
+ /*
+ * What is the defined encoding for this?
+ */
+ break;
+#endif /* AF_DECnet */
+ default:
+ /*
+ * Need to return some kind of errro status here.
+ * maybe a NULL auth??
+ */
+ break;
+ } /* switch */
+
+ if (addr)
+ free ((char *) addr);
+
+ time (&now);
+ xdmcp_data[j++] = (now >> 24) & 0xFF;
+ xdmcp_data[j++] = (now >> 16) & 0xFF;
+ xdmcp_data[j++] = (now >> 8) & 0xFF;
+ xdmcp_data[j++] = (now >> 0) & 0xFF;
+ while (j < 192 / 8)
+ xdmcp_data[j++] = 0;
+ _XLockMutex(_Xglobal_lock);
+ /* this function might use static data, hence the lock around it */
+ XdmcpWrap (xdmcp_data, auth_data + 8,
+ xdmcp_data, j);
+ _XUnlockMutex(_Xglobal_lock);
+ auth_data = xdmcp_data;
+ auth_datalen = j;
+ }
+#endif /* HASXDMAUTH */
+#ifdef SECURE_RPC
+ /*
+ * The SUN-DES-1 authorization protocol uses the
+ * "secure RPC" mechanism in SunOS 4.0+.
+ */
+ if (auth_namelen == 9 && !strncmp(auth_name, "SUN-DES-1", 9)) {
+ char servernetname[MAXNETNAMELEN + 1];
+
+ /*
+ * Copy over the server's netname from the authorization
+ * data field filled in by XauGetAuthByAddr().
+ */
+ if (auth_datalen > MAXNETNAMELEN) {
+ auth_datalen = 0;
+ auth_data = NULL;
+ } else {
+ memcpy(servernetname, auth_data, auth_datalen);
+ servernetname[auth_datalen] = '\0';
+
+ auth_datalen = sizeof (rpc_cred);
+ if (auth_ezencode(servernetname, 100, rpc_cred,
+ &auth_datalen))
+ auth_data = (unsigned char *) rpc_cred;
+ else {
+ auth_datalen = 0;
+ auth_data = NULL;
+ }
+ }
+ }
+#endif
+ if (saddr) free ((char *) saddr);
+ if ((*auth_namelenp = auth_namelen))
+ {
+ if ((*auth_namep = Xmalloc(auth_namelen)))
+ memcpy(*auth_namep, auth_name, auth_namelen);
+ else
+ *auth_namelenp = 0;
+ }
+ else
+ *auth_namep = NULL;
+ if ((*auth_datalenp = auth_datalen))
+ {
+ if ((*auth_datap = Xmalloc(auth_datalen)))
+ memcpy(*auth_datap, auth_data, auth_datalen);
+ else
+ *auth_datalenp = 0;
+ }
+ else
+ *auth_datap = NULL;
+ if (authptr) XauDisposeAuth (authptr);
+}