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+/* $Xorg: authutil.c,v 1.5 2001/02/09 02:03:26 xorgcvs Exp $ */
+/******************************************************************************
+
+
+Copyright 1993, 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.
+
+Author: Ralph Mor, X Consortium
+******************************************************************************/
+
+#include <X11/ICE/ICElib.h>
+#include "ICElibint.h"
+#include <X11/ICE/ICEutil.h>
+#include <X11/Xos.h>
+#include <sys/stat.h>
+#include <errno.h>
+
+#ifdef X_NOT_STDC_ENV
+extern int errno;
+extern long time ();
+extern char *getenv();
+#define Time_t long
+#else
+#include <time.h>
+#define Time_t time_t
+#endif
+#ifndef X_NOT_POSIX
+#include <unistd.h>
+#else
+#ifndef WIN32
+extern unsigned sleep ();
+#else
+#define link rename
+#endif
+#endif
+
+static Status read_short ();
+static Status read_string ();
+static Status read_counted_string ();
+static Status write_short ();
+static Status write_string ();
+static Status write_counted_string ();
+
+
+
+/*
+ * The following routines are for manipulating the .ICEauthority file
+ * These are utility functions - they are not part of the standard
+ * ICE library specification.
+ */
+
+char *
+IceAuthFileName ()
+
+{
+ static char slashDotICEauthority[] = "/.ICEauthority";
+ char *name;
+ static char *buf;
+ static int bsize;
+ int size;
+#ifdef WIN32
+#ifndef PATH_MAX
+#define PATH_MAX 512
+#endif
+ char dir[PATH_MAX];
+#endif
+
+ if ((name = getenv ("ICEAUTHORITY")))
+ return (name);
+
+ name = getenv ("HOME");
+
+ if (!name)
+ {
+#ifdef WIN32
+ register char *ptr1;
+ register char *ptr2;
+ int len1 = 0, len2 = 0;
+
+ if ((ptr1 = getenv("HOMEDRIVE")) && (ptr2 = getenv("HOMEDIR"))) {
+ len1 = strlen (ptr1);
+ len2 = strlen (ptr2);
+ } else if (ptr2 = getenv("USERNAME")) {
+ len1 = strlen (ptr1 = "/users/");
+ len2 = strlen (ptr2);
+ }
+ if ((len1 + len2 + 1) < PATH_MAX) {
+ sprintf (dir, "%s%s", ptr1, (ptr2) ? ptr2 : "");
+ name = dir;
+ }
+ if (!name)
+#endif
+ return (NULL);
+ }
+
+ size = strlen (name) + strlen (&slashDotICEauthority[1]) + 2;
+
+ if (size > bsize)
+ {
+ if (buf)
+ free (buf);
+ buf = malloc ((unsigned) size);
+ if (!buf)
+ return (NULL);
+ bsize = size;
+ }
+
+ strcpy (buf, name);
+ strcat (buf, slashDotICEauthority + (name[1] == '\0' ? 1 : 0));
+
+ return (buf);
+}
+
+
+
+int
+IceLockAuthFile (file_name, retries, timeout, dead)
+
+char *file_name;
+int retries;
+int timeout;
+long dead;
+
+{
+ char creat_name[1025], link_name[1025];
+ struct stat statb;
+ Time_t now;
+ int creat_fd = -1;
+
+ if ((int) strlen (file_name) > 1022)
+ return (IceAuthLockError);
+
+ strcpy (creat_name, file_name);
+ strcat (creat_name, "-c");
+ strcpy (link_name, file_name);
+ strcat (link_name, "-l");
+
+ if (stat (creat_name, &statb) != -1)
+ {
+ now = time ((Time_t *) 0);
+
+ /*
+ * NFS may cause ctime to be before now, special
+ * case a 0 deadtime to force lock removal
+ */
+
+ if (dead == 0 || now - statb.st_ctime > dead)
+ {
+ unlink (creat_name);
+ unlink (link_name);
+ }
+ }
+
+ while (retries > 0)
+ {
+ if (creat_fd == -1)
+ {
+ creat_fd = creat (creat_name, 0666);
+
+ if (creat_fd == -1)
+ {
+ if (errno != EACCES)
+ return (IceAuthLockError);
+ }
+ else
+ close (creat_fd);
+ }
+
+ if (creat_fd != -1)
+ {
+ if (link (creat_name, link_name) != -1)
+ return (IceAuthLockSuccess);
+
+ if (errno == ENOENT)
+ {
+ creat_fd = -1; /* force re-creat next time around */
+ continue;
+ }
+
+ if (errno != EEXIST)
+ return (IceAuthLockError);
+ }
+
+ sleep ((unsigned) timeout);
+ --retries;
+ }
+
+ return (IceAuthLockTimeout);
+}
+
+
+
+void
+IceUnlockAuthFile (file_name)
+
+char *file_name;
+
+{
+#ifndef WIN32
+ char creat_name[1025];
+#endif
+ char link_name[1025];
+
+ if ((int) strlen (file_name) > 1022)
+ return;
+
+#ifndef WIN32
+ strcpy (creat_name, file_name);
+ strcat (creat_name, "-c");
+#endif
+ strcpy (link_name, file_name);
+ strcat (link_name, "-l");
+
+#ifndef WIN32
+ unlink (creat_name);
+#endif
+ unlink (link_name);
+}
+
+
+
+IceAuthFileEntry *
+IceReadAuthFileEntry (auth_file)
+
+FILE *auth_file;
+
+{
+ IceAuthFileEntry local;
+ IceAuthFileEntry *ret;
+
+ local.protocol_name = NULL;
+ local.protocol_data = NULL;
+ local.network_id = NULL;
+ local.auth_name = NULL;
+ local.auth_data = NULL;
+
+ if (!read_string (auth_file, &local.protocol_name))
+ return (NULL);
+
+ if (!read_counted_string (auth_file,
+ &local.protocol_data_length, &local.protocol_data))
+ goto bad;
+
+ if (!read_string (auth_file, &local.network_id))
+ goto bad;
+
+ if (!read_string (auth_file, &local.auth_name))
+ goto bad;
+
+ if (!read_counted_string (auth_file,
+ &local.auth_data_length, &local.auth_data))
+ goto bad;
+
+ if (!(ret = (IceAuthFileEntry *) malloc (sizeof (IceAuthFileEntry))))
+ goto bad;
+
+ *ret = local;
+
+ return (ret);
+
+ bad:
+
+ if (local.protocol_name) free (local.protocol_name);
+ if (local.protocol_data) free (local.protocol_data);
+ if (local.network_id) free (local.network_id);
+ if (local.auth_name) free (local.auth_name);
+ if (local.auth_data) free (local.auth_data);
+
+ return (NULL);
+}
+
+
+
+void
+IceFreeAuthFileEntry (auth)
+
+IceAuthFileEntry *auth;
+
+{
+ if (auth)
+ {
+ if (auth->protocol_name) free (auth->protocol_name);
+ if (auth->protocol_data) free (auth->protocol_data);
+ if (auth->network_id) free (auth->network_id);
+ if (auth->auth_name) free (auth->auth_name);
+ if (auth->auth_data) free (auth->auth_data);
+ free ((char *) auth);
+ }
+}
+
+
+
+Status
+IceWriteAuthFileEntry (auth_file, auth)
+
+FILE *auth_file;
+IceAuthFileEntry *auth;
+
+{
+ if (!write_string (auth_file, auth->protocol_name))
+ return (0);
+
+ if (!write_counted_string (auth_file,
+ auth->protocol_data_length, auth->protocol_data))
+ return (0);
+
+ if (!write_string (auth_file, auth->network_id))
+ return (0);
+
+ if (!write_string (auth_file, auth->auth_name))
+ return (0);
+
+ if (!write_counted_string (auth_file,
+ auth->auth_data_length, auth->auth_data))
+ return (0);
+
+ return (1);
+}
+
+
+
+IceAuthFileEntry *
+IceGetAuthFileEntry (protocol_name, network_id, auth_name)
+
+char *protocol_name;
+char *network_id;
+char *auth_name;
+
+{
+ FILE *auth_file;
+ char *filename;
+ IceAuthFileEntry *entry;
+
+ if (!(filename = IceAuthFileName ()))
+ return (NULL);
+
+ if (access (filename, R_OK) != 0) /* checks REAL id */
+ return (NULL);
+
+ if (!(auth_file = fopen (filename, "rb")))
+ return (NULL);
+
+ for (;;)
+ {
+ if (!(entry = IceReadAuthFileEntry (auth_file)))
+ break;
+
+ if (strcmp (protocol_name, entry->protocol_name) == 0 &&
+ strcmp (network_id, entry->network_id) == 0 &&
+ strcmp (auth_name, entry->auth_name) == 0)
+ {
+ break;
+ }
+
+ IceFreeAuthFileEntry (entry);
+ }
+
+ fclose (auth_file);
+
+ return (entry);
+}
+
+
+
+/*
+ * local routines
+ */
+
+static Status
+read_short (file, shortp)
+
+FILE *file;
+unsigned short *shortp;
+
+{
+ unsigned char file_short[2];
+
+ if (fread ((char *) file_short, (int) sizeof (file_short), 1, file) != 1)
+ return (0);
+
+ *shortp = file_short[0] * 256 + file_short[1];
+ return (1);
+}
+
+
+static Status
+read_string (file, stringp)
+
+FILE *file;
+char **stringp;
+
+{
+ unsigned short len;
+ char *data;
+
+ if (!read_short (file, &len))
+ return (0);
+
+ if (len == 0)
+ {
+ data = 0;
+ }
+ else
+ {
+ data = malloc ((unsigned) len + 1);
+
+ if (!data)
+ return (0);
+
+ if (fread (data, (int) sizeof (char), (int) len, file) != len)
+ {
+ free (data);
+ return (0);
+ }
+
+ data[len] = '\0';
+ }
+
+ *stringp = data;
+
+ return (1);
+}
+
+
+static Status
+read_counted_string (file, countp, stringp)
+
+FILE *file;
+unsigned short *countp;
+char **stringp;
+
+{
+ unsigned short len;
+ char *data;
+
+ if (!read_short (file, &len))
+ return (0);
+
+ if (len == 0)
+ {
+ data = 0;
+ }
+ else
+ {
+ data = malloc ((unsigned) len);
+
+ if (!data)
+ return (0);
+
+ if (fread (data, (int) sizeof (char), (int) len, file) != len)
+ {
+ free (data);
+ return (0);
+ }
+ }
+
+ *stringp = data;
+ *countp = len;
+
+ return (1);
+}
+
+
+static Status
+write_short (file, s)
+
+FILE *file;
+unsigned short s;
+
+{
+ unsigned char file_short[2];
+
+ file_short[0] = (s & (unsigned) 0xff00) >> 8;
+ file_short[1] = s & 0xff;
+
+ if (fwrite ((char *) file_short, (int) sizeof (file_short), 1, file) != 1)
+ return (0);
+
+ return (1);
+}
+
+
+static Status
+write_string (file, string)
+
+FILE *file;
+char *string;
+
+{
+ unsigned short count = strlen (string);
+
+ if (!write_short (file, count))
+ return (0);
+
+ if (fwrite (string, (int) sizeof (char), (int) count, file) != count)
+ return (0);
+
+ return (1);
+}
+
+
+static Status
+write_counted_string (file, count, string)
+
+FILE *file;
+unsigned short count;
+char *string;
+
+{
+ if (!write_short (file, count))
+ return (0);
+
+ if (fwrite (string, (int) sizeof (char), (int) count, file) != count)
+ return (0);
+
+ return (1);
+}
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