/*      $NetBSD: sun_map.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */

/*
* Copyright (c) 1997-2014 Erez Zadok
* Copyright (c) 2005 Daniel P. Ottavio
* Copyright (c) 1990 Jan-Simon Pendry
* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry at Imperial College, London.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*
* File: am-utils/amd/sun_map.c
*
*/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amd.h>
#include <sun_map.h>



/*
* Add a data pointer to the end of the list.
*/
void
sun_list_add(struct sun_list *list, qelem *item)
{
 if (list->last == NULL) {
   list->last = item;
   list->first = item;
   item->q_back = NULL;
 }
 else {
   list->last->q_forw = item;
   item->q_back = list->last;
   list->last = item;
 }

 item->q_forw = NULL;
}


/*
* Sun2Amd conversion routines
*/

/*
* AMD entry keywords
*/
#define AMD_OPTS_KW      "addopts:="     /* add entry options */
#define AMD_RHOST_KW     "rhost:="       /* remote host */
#define AMD_RFS_KW       "rfs:="         /* remote file system */
#define AMD_FS_KW        "fs:="          /* local file system */
#define AMD_DEV_KW       "dev:="         /* device */
#define AMD_TYPE_NFS_KW  "type:=nfs;"    /* fs type nfs */
#define AMD_TYPE_AUTO_KW "type:=auto;"   /* fs type auto */
#define AMD_TYPE_CDFS_KW "type:=cdfs;"   /* fs type cd */
#define AMD_MAP_FS_KW    "fs:=${map};"   /* set the mount map as current map */
#define AMD_MAP_PREF_KW  "pref:=${key}/" /* set the mount map as current map */

/*
* A set of string Sun fstypes.
*/
#define SUN_NFS_TYPE     "nfs"
#define SUN_HSFS_TYPE    "hsfs" /* CD fs */
#define SUN_AUTOFS_TYPE  "autofs"
#define SUN_CACHEFS_TYPE "cachefs"

#define SUN_KEY_SUB      "&"         /* Sun key substitution */

/* a set a Sun variable substitutions for map entries */
#define SUN_ARCH         "$ARCH"     /* host architecture */
#define SUN_CPU          "$CPU"      /* processor type */
#define SUN_HOST         "$HOST"     /* host name */
#define SUN_OSNAME       "$OSNAME"   /* OS name */
#define SUN_OSREL        "$OSREL"    /* OS release */
#define SUN_OSVERS       "$OSVERS"   /* OS version */
#define SUN_NATISA       "$NATISA"   /* native instruction set */

/* a set of Amd variable substitutions */
#define AMD_ARCH         "${arch}"   /* host architecture */
#define AMD_HOST         "${host}"   /* host name */
#define AMD_OSNAME       "${os}"     /* OS name */
#define AMD_OSVER        "${osver}"  /* OS version */


/*
* Return a copy of src that has all occurrences of 'str' replaced
* with sub.
*
* param src - the original string
* param str - string that is the replaced with str
* param sub - string that replaces an occurrences of 'delim'
*
* return - new string with str substitutions, NULL on error
*/
static char *
sun_strsub(const char *src, const char *str, const char *sub)
{

 char *retval = NULL, *str_start, *str_end, *src_end;
 size_t total_size, first_half, second_half, sub_size;

 /* assign pointers to the start and end of str */
 if ((str_start = strstr(src, str)) == NULL) {
   return retval;
 }
 str_end = (strlen(str) - 1) + str_start;

 /* assign to the end of the src. */
 src_end = (strlen(src) - 1) + (char*)src;

 /* size from the beginning of src to the start of str */
 first_half = (size_t)(str_start - src);

 /* size from the end of str to the end of src */
 second_half = (size_t)(src_end - str_end);

 sub_size = strlen(sub);

 total_size = (first_half + sub_size + second_half + 1);

 retval = (char*)xmalloc(total_size);
 memset(retval, 0, total_size);

 /*
  * Put together the string such that the first half is copied
  * followed the sub and second half.
  *
  * We use strncpy instead of xstrlcpy because we are intentionally
  * causing truncation and we don't want this to cause errors in the
  * log.
  */
 (void)strncpy(retval, src, first_half);
 (void)strncat(retval, sub, sub_size);
 (void)strncat(retval, str_end + 1, second_half);

 if (strstr(retval, str) != NULL) {
   /*
    * If there is another occurrences of str call this function
    * recursively.
    */
   char* tmp;
   if ((tmp = sun_strsub(retval, str, sub)) != NULL) {
     XFREE(retval);
     retval = tmp;
   }
 }
 return retval;
}


/*
* Return a new string that is a copy of str, all occurrences of a Sun
* variable substitutions are replaced by there equivalent Amd
* substitutions.
*
* param str - source string
*
* return - A new string with the expansions, NULL if str does not
* exist in src or error.
*/
static char *
sun_expand2amd(const char *str)
{

 char *retval = NULL, *tmp = NULL, *tmp2 = NULL;
 const char *pos;

 /*
  * Iterator through the string looking for '$' chars.  For each '$'
  * found try to replace it with Sun variable substitutions.  If we
  * find a '$' that is not a substation each of the i.e $blah than
  * each of the replace attempt will fail and we'll move on to the
  * next char.
  */
 tmp = xstrdup(str);
 for (pos = str; *pos != '\0'; pos++) {
   if (*pos != '$') {
     continue;
   }
   if (tmp2 != NULL) {
     XFREE(tmp);
     tmp = tmp2;
   }

   /*
    * If a 'replace' does not return NULL than a variable was
    * successfully substituted.
    */

   /* architecture */
   if ((tmp2 = sun_strsub(tmp, SUN_ARCH, AMD_ARCH)) != NULL) {
     continue;
   }
   /* cpu - there is not POSIX uname for cpu so just use machine */
   if ((tmp2 = sun_strsub(tmp, SUN_CPU, AMD_ARCH)) != NULL) {
     continue;
   }
   /* hostname */
   if ((tmp2 = sun_strsub(tmp, SUN_HOST, AMD_HOST)) != NULL) {
     continue;
   }
   /* os name */
   if ((tmp2 = sun_strsub(tmp, SUN_OSNAME, AMD_OSNAME)) != NULL) {
     continue;
   }
   /*
    * os release - Amd doesn't hava a OS release var just usr os
    * version or now.
    */
   if ((tmp2 = sun_strsub(tmp, SUN_OSREL, AMD_OSVER)) != NULL) {
     continue;
   }
   /* os version */
   if ((tmp2 = sun_strsub(tmp, SUN_OSVERS, AMD_OSVER)) != NULL) {
     continue;
   }
   /* native instruction set - there is no POSIX natisa so just use system */
   if ((tmp2 = sun_strsub(tmp, SUN_NATISA, AMD_ARCH)) != NULL) {
     continue;
   }
 }
 if (tmp2 == NULL) {
   retval = tmp;
 }
 else {
   retval = tmp2;
   XFREE(tmp);
 }

 return retval;
}


/*
* This is a wrapper function for appending Amd entry information to a
* buffer.  Any Sun variable substitutions will be converted into Amd
* equivalents.
*
* param dest   - destination buffer
* param deslen - destination buffer length
* param key    - entry key, this might be needed for key substitutions
* param str    - string to append
*/
static void
sun_append_str(char *dest,
              size_t destlen,
              const char *key,
              const char *str)
{
 char *sub = NULL, *sub2 = NULL, *out = NULL;

 /* By default we are going to just write the original string. */
 out = (char*)str;

 /*
  * Resolve variable substitutions in two steps; 1) replace any key
  * map substitutions with the entry key 2) expand any variable
  * substitutions i.e $HOST.
  *
  * Try to replace the key substitution '&'. If this function returns
  * with a new string, one or more key subs. where replaced with the
  * entry key.
  */
 if ((sub = sun_strsub(str, SUN_KEY_SUB, "${key}")) != NULL) {
   out = sub;
   /*
    * Try to convert any variable substitutions. If this function
    * returns a new string one or more var subs where expanded.
    */
   if ((sub2 = sun_expand2amd(sub)) != NULL) {
     out = sub2;
   }
 }
 /*
  * Try to convert any variable substitutions. If this function
  * returns a new string one or more var subs where expanded.
  */
 else if (out != NULL && (sub = sun_expand2amd(out)) != NULL) {
   out = sub;
 }

 if (out != NULL) {
   xstrlcat(dest, out, destlen);
 }
 XFREE(sub);
 XFREE(sub2);
}


/*
* Convert the list of Sun mount options to Amd mount options.  The
* result is concatenated to dest.
*
* param dest     - destination buffer
* param destlen  - destination buffer length
* param key      - automount key
* param opt_list - list of Sun mount options
*/
static void
sun_opts2amd(char *dest,
            size_t destlen,
            const char *key,
            const struct sun_opt *opt_list)
{
 const struct sun_opt *opt;

 xstrlcat(dest, AMD_OPTS_KW, destlen);

 /* Iterate through each option and append it to the buffer. */
 for(opt = opt_list; opt != NULL; opt = NEXT(struct sun_opt, opt)) {
   sun_append_str(dest, destlen, key, opt->str);
   /* If there are more options add some commas. */
   if (NEXT(struct sun_opt, opt) != NULL) {
     xstrlcat(dest, ",", destlen);
   }
 }
 xstrlcat(dest, ";", destlen);
}


/*
* Convert the list of Sun mount locations to a list of Amd mount
* locations.  The result is concatenated to dest.
*
* param dest       - destination buffer
* param destlen    - destination buffer length
* param key        - automount key
* param local_list - list of Sun mount locations
*/
static void
sun_locations2amd(char *dest,
                 size_t destlen,
                 const char *key,
                 const struct sun_location *local_list)
{
 const struct sun_location *local;
 const struct sun_host *host;

 for (local = local_list;
      local != NULL;
      local = NEXT(struct sun_location,local)) {
   /*
    * Check to see if the list of hosts is empty.  Some mount types
    * i.e cd-rom may have mount location with no host.
    */
   if (local->host_list != NULL) {
     /* Write each host that belongs to this location. */
     for (host = local->host_list;
          host != NULL;
          host = NEXT(struct sun_host, host)) {
       /* set fstype NFS */
       xstrlcat(dest, AMD_TYPE_NFS_KW, destlen);
       /* add rhost key word */
       xstrlcat(dest, AMD_RHOST_KW, destlen);
       /* add host name */
       sun_append_str(dest, destlen, key, host->name);
       xstrlcat(dest, ";", destlen);
       /* add remote fs key word */
       xstrlcat(dest, AMD_RFS_KW, destlen);
       /* add local path */
       sun_append_str(dest, destlen, key, local->path);
       if (NEXT(struct sun_host, host) != NULL) {
         xstrlcat(dest, ";", destlen);
         xstrlcat(dest, " ", destlen);
       }
     }
   }
   else {
     /* no host location */
     xstrlcat(dest, AMD_FS_KW, destlen);
     sun_append_str(dest, destlen, key, local->path);
   }
   if (NEXT(struct sun_location, local) != NULL) {
     /* add a space to separate each location */
     xstrlcat(dest, " ", destlen);
   }
 }
}


/*
* Convert a Sun HSFS mount point to an Amd.  The result is
* concatenated intp dest.
*
* param dest    - destination buffer
* param destlen - destination buffer length
* param key     - automount key
* param s_entry - Sun entry
*/
static void
sun_hsfs2amd(char *dest,
            size_t destlen,
            const char *key,
            const struct sun_entry *s_entry)
{
 /* set fstype CDFS */
 xstrlcat(dest, AMD_TYPE_CDFS_KW, destlen);
 /* set the cdrom device */
 xstrlcat(dest, AMD_DEV_KW, destlen);
 /* XXX: For now just assume that there is only one device. */
 xstrlcat(dest, s_entry->location_list->path, destlen);
}


/*
* Convert a Sun NFS automount entry to an Amd.  The result is concatenated
* into dest.
*
* param dest    - destination buffer
* param destlen - destination buffer length
* param key     - automount key
* param s_entry - Sun entry
*/
static void
sun_nfs2amd(char *dest,
           size_t destlen,
           const char *key,
           const struct sun_entry *s_entry)
{
 if (s_entry->location_list != NULL) {
   /* write out the list of mountpoint locations */
   sun_locations2amd(dest, destlen, key, s_entry->location_list);
 }
}


/*
* Convert a Sun multi-mount point entry to an Amd.  This is done
* using the Amd type auto.  Each auto entry is separated with a \n.
*
* param dest    - destination buffer
* param destlen - destination buffer length
* param key     - automount key
* param s_entry - Sun entry
*/
static void
sun_multi2amd(char *dest,
             size_t destlen,
             const char *key,
             const struct sun_entry *s_entry)
{
 const struct sun_mountpt *mountpt;

 /* We need to setup a auto fs Amd automount point. */
 xstrlcat(dest, AMD_TYPE_AUTO_KW, destlen);
 xstrlcat(dest, AMD_MAP_FS_KW, destlen);
 xstrlcat(dest, AMD_MAP_PREF_KW, destlen);

 /* write the mountpts to dest */
 for (mountpt = s_entry->mountpt_list;
      mountpt != NULL;
      mountpt = NEXT(struct sun_mountpt, mountpt)) {
   xstrlcat(dest, "\n", destlen);
   /* write the key */
   xstrlcat(dest, key, destlen);
   /* write the mount path */
   sun_append_str(dest, destlen, key, mountpt->path);
   /* space */
   xstrlcat(dest, " ", destlen);
   /* Write all the host locations for this mount point. */
   sun_locations2amd(dest, destlen, key, mountpt->location_list);
 }
}


/*
* Convert the sun_entry into an Amd equivalent string.
*
* param key     - automount key
* param s_entry - Sun style automap entry
*
* return - Amd entry on succes, NULL on error
*/
char *
sun_entry2amd(const char *key, const char *s_entry_str)
{
 char *retval = NULL;
 char line_buff[INFO_MAX_LINE_LEN];
 int ws;
 struct sun_entry *s_entry = NULL;

 /* The key should not be NULL. */
 if (key == NULL) {
   plog(XLOG_ERROR,"Sun key value was null");
   goto err;
 }
 /* The Sun entry string should never be NULL. */
 if (s_entry_str == NULL) {
   plog(XLOG_ERROR,"Sun entry value was null");
   goto err;
 }

 /* Make sure there are no trailing white spaces or '\n'. */
 xstrlcpy(line_buff, s_entry_str, sizeof(line_buff));
 ws = strlen(line_buff) - 1;
 while (ws >= 0 && (isspace((unsigned char)line_buff[ws]) || line_buff[ws] == '\n')) {
   line_buff[ws--] = '\0';
 }

 /* Parse the sun entry line. */
 s_entry = sun_map_parse_read(line_buff);
 if (s_entry == NULL) {
   plog(XLOG_ERROR,"could not parse Sun style map");
   goto err;
 }

 memset(line_buff, 0, sizeof(line_buff));

 if (s_entry->opt_list != NULL) {
   /* write the mount options to the buffer  */
   sun_opts2amd(line_buff, sizeof(line_buff), key, s_entry->opt_list);
 }

 /* Check if this is a multi-mount entry. */
 if (s_entry->mountpt_list != NULL) {
   /* multi-mount point */
   sun_multi2amd(line_buff, sizeof(line_buff), key, s_entry);
   retval = xstrdup(line_buff);
 }
 else {
   /* single mount point */
   if (s_entry->fstype != NULL) {
     if (NSTREQ(s_entry->fstype, SUN_NFS_TYPE, strlen(SUN_NFS_TYPE))) {
       /* NFS Type */
       sun_nfs2amd(line_buff, sizeof(line_buff), key, s_entry);
       retval = xstrdup(line_buff);
     }
     else if (NSTREQ(s_entry->fstype, SUN_HSFS_TYPE, strlen(SUN_HSFS_TYPE))) {
       /* HSFS Type (CD fs) */
       sun_hsfs2amd(line_buff, sizeof(line_buff), key, s_entry);
       retval = xstrdup(line_buff);
     }
     /*
      * XXX: The following fstypes are not yet supported.
      */
     else if (NSTREQ(s_entry->fstype, SUN_AUTOFS_TYPE, strlen(SUN_AUTOFS_TYPE))) {
       /* AutoFS Type */
       plog(XLOG_ERROR, "Sun fstype %s is currently not supported by Amd.",
            s_entry->fstype);
       goto err;

     }
     else if (NSTREQ(s_entry->fstype, SUN_CACHEFS_TYPE, strlen(SUN_CACHEFS_TYPE))) {
       /* CacheFS Type */
       plog(XLOG_ERROR, "Sun fstype %s is currently not supported by Amd.",
            s_entry->fstype);
       goto err;
     }
     else {
       plog(XLOG_ERROR, "Sun fstype %s is currently not supported by Amd.",
            s_entry->fstype);
       goto err;
     }
   }
   else {
     plog(XLOG_INFO, "No SUN fstype specified defaulting to NFS.");
     sun_nfs2amd(line_buff, sizeof(line_buff), key, s_entry);
     retval = xstrdup(line_buff);
   }
 }

err:
 XFREE(s_entry);
 return retval;
}

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