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Edit File: Xtransutil.c

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* Copyright 1993, 1994 NCR Corporation - Dayton, Ohio, USA
 *
 * All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted, provided
 * that the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name NCR not be used in advertising
 * or publicity pertaining to distribution of the software without specific,
 * written prior permission.  NCR makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * NCRS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
 * NO EVENT SHALL NCR BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * These are some utility functions created for convenience or to provide
 * an interface that is similar to an existing interface. These are built
 * only using the Transport Independant API, and have no knowledge of
 * the internal implementation.
 */

#ifdef XTHREADS
#include <X11/Xthreads.h>
#endif
#ifdef WIN32
#include <X11/Xlibint.h>
#include <X11/Xwinsock.h>
#endif

#ifdef X11_t

/*
 * These values come from X.h and Xauth.h, and MUST match them. Some
 * of these values are also defined by the ChangeHost protocol message.
 */

#define FamilyInternet		0	/* IPv4 */
#define FamilyDECnet		1
#define FamilyChaos		2
#define FamilyInternet6		6
#define FamilyAmoeba		33
#define FamilyLocalHost		252
#define FamilyKrb5Principal	253
#define FamilyNetname		254
#define FamilyLocal		256
#define FamilyWild		65535

/*
 * TRANS(ConvertAddress) converts a sockaddr based address to an
 * X authorization based address. Some of this is defined as part of
 * the ChangeHost protocol. The rest is just done in a consistent manner.
 */

int
TRANS(ConvertAddress)(int *familyp, int *addrlenp, Xtransaddr **addrp)

{

prmsg(2,"ConvertAddress(%d,%d,%p)\n",*familyp,*addrlenp,*addrp);

switch( *familyp )
    {
#if defined(TCPCONN)
    case AF_INET:
    {
	/*
	 * Check for the BSD hack localhost address 127.0.0.1.
	 * In this case, we are really FamilyLocal.
	 */

struct sockaddr_in saddr;
	int len = sizeof(saddr.sin_addr.s_addr);
	char *cp = (char *) &saddr.sin_addr.s_addr;

memcpy (&saddr, *addrp, sizeof (struct sockaddr_in));

if ((len == 4) && (cp[0] == 127) && (cp[1] == 0) &&
	    (cp[2] == 0) && (cp[3] == 1))
	{
	    *familyp=FamilyLocal;
	}
	else
	{
	    *familyp=FamilyInternet;
	    *addrlenp=len;
	    memcpy(*addrp,&saddr.sin_addr,len);
	}
	break;
    }

#if defined(IPv6) && defined(AF_INET6)
    case AF_INET6:
    {
	struct sockaddr_in6 saddr6;

memcpy (&saddr6, *addrp, sizeof (struct sockaddr_in6));

if (IN6_IS_ADDR_LOOPBACK(&saddr6.sin6_addr))
	{
	    *familyp=FamilyLocal;
	}
	else if (IN6_IS_ADDR_V4MAPPED(&(saddr6.sin6_addr))) {
	    char *cp = (char *) &saddr6.sin6_addr.s6_addr[12];

if ((cp[0] == 127) && (cp[1] == 0) &&
	      (cp[2] == 0) && (cp[3] == 1))
	    {
		*familyp=FamilyLocal;
	    }
	    else
	    {
		*familyp=FamilyInternet;
		*addrlenp = sizeof (struct in_addr);
		memcpy(*addrp,cp,*addrlenp);
	    }
	}
	else
	{
	    *familyp=FamilyInternet6;
	    *addrlenp=sizeof(saddr6.sin6_addr);
	    memcpy(*addrp,&saddr6.sin6_addr,sizeof(saddr6.sin6_addr));
	}
	break;
    }
#endif /* IPv6 */
#endif /* defined(TCPCONN) */

#if defined(UNIXCONN) || defined(LOCALCONN)
    case AF_UNIX:
    {
	*familyp=FamilyLocal;
	break;
    }
#endif /* defined(UNIXCONN) || defined(LOCALCONN) */

#if (defined(__SCO__) || defined(__UNIXWARE__)) && defined(LOCALCONN)
    case 0:
    {
	*familyp=FamilyLocal;
	break;
    }
#endif

default:
	prmsg(1,"ConvertAddress: Unknown family type %d\n",
	      *familyp);
	return -1;
    }

if (*familyp == FamilyLocal)
    {
	/*
	 * In the case of a local connection, we need to get the
	 * host name for authentication.
	 */

char hostnamebuf[256];
	int len = TRANS(GetHostname) (hostnamebuf, sizeof hostnamebuf);

if (len > 0) {
	    if (*addrp && *addrlenp < (len + 1))
	    {
		free (*addrp);
		*addrp = NULL;
	    }
	    if (!*addrp)
		*addrp = malloc (len + 1);
	    if (*addrp) {
		strcpy ((char *) *addrp, hostnamebuf);
		*addrlenp = len;
	    } else {
		*addrlenp = 0;
	    }
	}
	else
	{
	    if (*addrp)
		free (*addrp);
	    *addrp = NULL;
	    *addrlenp = 0;
	}
    }

return 0;
}

#endif /* X11_t */

#ifdef ICE_t

/* Needed for _XGethostbyaddr usage in TRANS(GetPeerNetworkId) */
# if defined(TCPCONN) || defined(UNIXCONN)
#  define X_INCLUDE_NETDB_H
#  define XOS_USE_NO_LOCKING
#  include <X11/Xos_r.h>
# endif

#include <signal.h>

char *
TRANS(GetMyNetworkId) (XtransConnInfo ciptr)

{
    int		family = ciptr->family;
    char 	*addr = ciptr->addr;
    char	hostnamebuf[256];
    char 	*networkId = NULL;
    const char	*transName = ciptr->transptr->TransName;

if (gethostname (hostnamebuf, sizeof (hostnamebuf)) < 0)
    {
	return (NULL);
    }

switch (family)
    {
#if defined(UNIXCONN) || defined(LOCALCONN)
    case AF_UNIX:
    {
	struct sockaddr_un *saddr = (struct sockaddr_un *) addr;
	networkId = malloc (3 + strlen (transName) +
	    strlen (hostnamebuf) + strlen (saddr->sun_path));
	sprintf (networkId, "%s/%s:%s", transName,
	    hostnamebuf, saddr->sun_path);
	break;
    }
#endif /* defined(UNIXCONN) || defined(LOCALCONN) */

#if defined(TCPCONN)
    case AF_INET:
#if defined(IPv6) && defined(AF_INET6)
    case AF_INET6:
#endif
    {
	struct sockaddr_in *saddr = (struct sockaddr_in *) addr;
#if defined(IPv6) && defined(AF_INET6)
	struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *) addr;
#endif
	int portnum;
	char portnumbuf[10];

#if defined(IPv6) && defined(AF_INET6)
	if (family == AF_INET6)
	    portnum = ntohs (saddr6->sin6_port);
	else
#endif
	    portnum = ntohs (saddr->sin_port);

snprintf (portnumbuf, sizeof(portnumbuf), "%d", portnum);
	networkId = malloc (3 + strlen (transName) +
	    strlen (hostnamebuf) + strlen (portnumbuf));
	sprintf (networkId, "%s/%s:%s", transName, hostnamebuf, portnumbuf);
	break;
    }
#endif /* defined(TCPCONN) */

default:
	break;
    }

return (networkId);
}

#include <setjmp.h>
static jmp_buf env;

#ifdef SIGALRM
static volatile int nameserver_timedout = 0;

static void
nameserver_lost(int sig _X_UNUSED)
{
  nameserver_timedout = 1;
  longjmp (env, -1);
  /* NOTREACHED */
}
#endif /* SIGALARM */

char *
TRANS(GetPeerNetworkId) (XtransConnInfo ciptr)

{
    int		family = ciptr->family;
    char	*peer_addr = ciptr->peeraddr;
    char	*hostname;
    char	addrbuf[256];
    const char	*addr = NULL;

switch (family)
    {
    case AF_UNSPEC:
#if defined(UNIXCONN) || defined(LOCALCONN)
    case AF_UNIX:
    {
	if (gethostname (addrbuf, sizeof (addrbuf)) == 0)
	    addr = addrbuf;
	break;
    }
#endif /* defined(UNIXCONN) || defined(LOCALCONN) */

#if defined(TCPCONN)
    case AF_INET:
#if defined(IPv6) && defined(AF_INET6)
    case AF_INET6:
#endif
    {
	struct sockaddr_in *saddr = (struct sockaddr_in *) peer_addr;
#if defined(IPv6) && defined(AF_INET6)
	struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *) peer_addr;
#endif
	char *address;
	int addresslen;
#ifdef XTHREADS_NEEDS_BYNAMEPARAMS
	_Xgethostbynameparams hparams;
#endif
	struct hostent * volatile hostp = NULL;

#if defined(IPv6) && defined(AF_INET6)
	if (family == AF_INET6)
	{
	    address = (char *) &saddr6->sin6_addr;
	    addresslen = sizeof (saddr6->sin6_addr);
	}
	else
#endif
	{
	    address = (char *) &saddr->sin_addr;
	    addresslen = sizeof (saddr->sin_addr);
	}

#ifdef SIGALRM
	/*
	 * gethostbyaddr can take a LONG time if the host does not exist.
	 * Assume that if it does not respond in NAMESERVER_TIMEOUT seconds
	 * that something is wrong and do not make the user wait.
	 * gethostbyaddr will continue after a signal, so we have to
	 * jump out of it.
	 */

nameserver_timedout = 0;
	signal (SIGALRM, nameserver_lost);
	alarm (4);
	if (setjmp(env) == 0) {
#endif
	    hostp = _XGethostbyaddr (address, addresslen, family, hparams);
#ifdef SIGALRM
	}
	alarm (0);
#endif
	if (hostp != NULL)
	  addr = hostp->h_name;
	else
#if defined(IPv6) && defined(AF_INET6)
	  addr = inet_ntop (family, address, addrbuf, sizeof (addrbuf));
#else
	  addr = inet_ntoa (saddr->sin_addr);
#endif
	break;
    }

#endif /* defined(TCPCONN) */

default:
	return (NULL);
    }

hostname = malloc (strlen (ciptr->transptr->TransName) + strlen (addr) + 2);
    strcpy (hostname, ciptr->transptr->TransName);
    strcat (hostname, "/");
    if (addr)
	strcat (hostname, addr);

return (hostname);
}

#endif /* ICE_t */

#if defined(WIN32) && defined(TCPCONN)
int
TRANS(WSAStartup) (void)
{
    static WSADATA wsadata;

prmsg (2,"WSAStartup()\n");

if (!wsadata.wVersion && WSAStartup(MAKEWORD(2,2), &wsadata))
        return 1;
    return 0;
}
#endif

#include <ctype.h>

static int
is_numeric (const char *str)
{
    int i;

for (i = 0; i < (int) strlen (str); i++)
	if (!isdigit (str[i]))
	    return (0);

return (1);
}

#ifdef TRANS_SERVER
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>

#if !defined(S_IFLNK) && !defined(S_ISLNK)
#undef lstat
#define lstat(a,b) stat(a,b)
#endif

#define FAIL_IF_NOMODE  1
#define FAIL_IF_NOT_ROOT 2
#define WARN_NO_ACCESS 4

/*
 * We make the assumption that when the 'sticky' (t) bit is requested
 * it's not save if the directory has non-root ownership or the sticky
 * bit cannot be set and fail.
 */
static int
trans_mkdir(const char *path, int mode)
{
    struct stat buf;

if (lstat(path, &buf) != 0) {
	if (errno != ENOENT) {
	    prmsg(1, "mkdir: ERROR: (l)stat failed for %s (%d)\n",
		  path, errno);
	    return -1;
	}
	/* Dir doesn't exist. Try to create it */

#if !defined(WIN32) && !defined(__CYGWIN__)
	/*
	 * 'sticky' bit requested: assume application makes
	 * certain security implications. If effective user ID
	 * is != 0: fail as we may not be able to meet them.
	 */
	if (geteuid() != 0) {
	    if (mode & 01000) {
		prmsg(1, "mkdir: ERROR: euid != 0,"
		      "directory %s will not be created.\n",
		      path);
#ifdef FAIL_HARD
		return -1;
#endif
	    } else {
		prmsg(1, "mkdir: Cannot create %s with root ownership\n",
		      path);
	    }
	}
#endif

#ifndef WIN32
	if (mkdir(path, mode) == 0) {
	    if (chmod(path, mode)) {
		prmsg(1, "mkdir: ERROR: Mode of %s should be set to %04o\n",
		      path, mode);
#ifdef FAIL_HARD
		return -1;
#endif
	    }
#else
	if (mkdir(path) == 0) {
#endif
	} else {
	    prmsg(1, "mkdir: ERROR: Cannot create %s\n",
		  path);
	    return -1;
	}

return 0;

} else {
	if (S_ISDIR(buf.st_mode)) {
	    int updateOwner = 0;
	    int updateMode = 0;
	    int updatedOwner = 0;
	    int updatedMode = 0;
	    int status = 0;
	    /* Check if the directory's ownership is OK. */
	    if (buf.st_uid != 0)
		updateOwner = 1;

/*
	     * Check if the directory's mode is OK.  An exact match isn't
	     * required, just a mode that isn't more permissive than the
	     * one requested.
	     */
	    if ((~mode) & 0077 & buf.st_mode)
		updateMode = 1;

/*
	     * If the directory is not writeable not everybody may
	     * be able to create sockets. Therefore warn if mode
	     * cannot be fixed.
	     */
	    if ((~buf.st_mode) & 0022 & mode) {
		updateMode = 1;
		status |= WARN_NO_ACCESS;
	    }

/*
	     * If 'sticky' bit is requested fail if owner isn't root
	     * as we assume the caller makes certain security implications
	     */
	    if (mode & 01000) {
		status |= FAIL_IF_NOT_ROOT;
		if (!(buf.st_mode & 01000)) {
		    status |= FAIL_IF_NOMODE;
		    updateMode = 1;
		}
	    }

#ifdef HAS_FCHOWN
	    /*
	     * If fchown(2) and fchmod(2) are available, try to correct the
	     * directory's owner and mode.  Otherwise it isn't safe to attempt
	     * to do this.
	     */
	    if (updateMode || updateOwner) {
		int fd = -1;
		struct stat fbuf;
		if ((fd = open(path, O_RDONLY)) != -1) {
		    if (fstat(fd, &fbuf) == -1) {
			prmsg(1, "mkdir: ERROR: fstat failed for %s (%d)\n",
			      path, errno);
			close(fd);
			return -1;
		    }
		    /*
		     * Verify that we've opened the same directory as was
		     * checked above.
		     */
		    if (!S_ISDIR(fbuf.st_mode) ||
			buf.st_dev != fbuf.st_dev ||
			buf.st_ino != fbuf.st_ino) {
			prmsg(1, "mkdir: ERROR: inode for %s changed\n",
			      path);
			close(fd);
			return -1;
		    }
		    if (updateOwner && fchown(fd, 0, 0) == 0)
			updatedOwner = 1;
		    if (updateMode && fchmod(fd, mode) == 0)
			updatedMode = 1;
		    close(fd);
		}
	    }
#endif

if (updateOwner && !updatedOwner) {
#ifdef FAIL_HARD
		if (status & FAIL_IF_NOT_ROOT) {
		    prmsg(1, "mkdir: ERROR: Owner of %s must be set to root\n",
			  path);
		    return -1;
		}
#endif
#if !defined(__APPLE_CC__) && !defined(__CYGWIN__)
		prmsg(1, "mkdir: Owner of %s should be set to root\n",
		      path);
#endif
	    }

if (updateMode && !updatedMode) {
#ifdef FAIL_HARD
		if (status & FAIL_IF_NOMODE) {
		    prmsg(1, "mkdir: ERROR: Mode of %s must be set to %04o\n",
			  path, mode);
		    return -1;
		}
#endif
		prmsg(1, "mkdir: Mode of %s should be set to %04o\n",
		      path, mode);
		if (status & WARN_NO_ACCESS) {
		    prmsg(1, "mkdir: this may cause subsequent errors\n");
		}
	    }
	    return 0;
	}
	return -1;
    }

/* In all other cases, fail */
    return -1;
}

#endif /* TRANS_SERVER */