/* mkpasswd.c:

   Copyright 1997, 1998, 1999, 2000 Cygnus Solutions.

   This file is part of Cygwin.

   This software is a copyrighted work licensed under the terms of the
   Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
   details. */

#include <ctype.h>
#include <stdlib.h>
#include <wchar.h>
#include <stdio.h>
#include <windows.h>
#include <sys/cygwin.h>
#include <getopt.h>
#include <lmaccess.h>
#include <lmapibuf.h>

SID_IDENTIFIER_AUTHORITY sid_world_auth = {SECURITY_WORLD_SID_AUTHORITY};
SID_IDENTIFIER_AUTHORITY sid_nt_auth = {SECURITY_NT_AUTHORITY};

NET_API_STATUS WINAPI (*netapibufferfree)(PVOID);
NET_API_STATUS WINAPI (*netuserenum)(LPWSTR,DWORD,DWORD,PBYTE*,DWORD,PDWORD,PDWORD,PDWORD);
NET_API_STATUS WINAPI (*netlocalgroupenum)(LPWSTR,DWORD,PBYTE*,DWORD,PDWORD,PDWORD,PDWORD);
NET_API_STATUS WINAPI (*netgetdcname)(LPWSTR,LPWSTR,PBYTE*);

#ifndef min
#define min(a,b) (((a)<(b))?(a):(b))
#endif

BOOL
load_netapi ()
{
  HANDLE h = LoadLibrary ("netapi32.dll");

  if (!h)
    return FALSE;

  if (!(netapibufferfree = GetProcAddress (h, "NetApiBufferFree")))
    return FALSE;
  if (!(netuserenum = GetProcAddress (h, "NetUserEnum")))
    return FALSE;
  if (!(netlocalgroupenum = GetProcAddress (h, "NetLocalGroupEnum")))
    return FALSE;
  if (!(netgetdcname = GetProcAddress (h, "NetGetDCName")))
    return FALSE;

  return TRUE;
}

char *
put_sid (PSID sid)
{
  static char s[512];
  char t[32];
  DWORD i;

  strcpy (s, "S-1-");
  sprintf(t, "%u", GetSidIdentifierAuthority (sid)->Value[5]);
  strcat (s, t);
  for (i = 0; i < *GetSidSubAuthorityCount (sid); ++i)
    {
      sprintf(t, "-%lu", *GetSidSubAuthority (sid, i));
      strcat (s, t);
    }
  return s;
}

void
psx_dir (char *in, char *out)
{
  if (isalpha (in[0]) && in[1] == ':')
    {
      sprintf (out, "/cygdrive/%c", in[0]);
      in += 2;
      out += strlen (out);
    }

  while (*in)
    {
      if (*in == '\\')
	*out = '/';
      else
	*out = *in;
      in++;
      out++;
    }

  *out = '\0';
}

void
uni2ansi (LPWSTR wcs, char *mbs, int size)
{
  if (wcs)
    WideCharToMultiByte (CP_ACP, 0, wcs, -1, mbs, size, NULL, NULL);
  else
    *mbs = '\0';
}

int
enum_users (LPWSTR servername, int print_sids, int print_cygpath,
	    const char * passed_home_path, int id_offset)
{
  USER_INFO_3 *buffer;
  DWORD entriesread = 0;
  DWORD totalentries = 0;
  DWORD resume_handle = 0;
  DWORD rc;
  char ansi_srvname[256];

  if (servername)
    uni2ansi (servername, ansi_srvname, sizeof (ansi_srvname));

  do
    {
      DWORD i;

      rc = netuserenum (servername, 3, FILTER_NORMAL_ACCOUNT,
			(LPBYTE *) & buffer, 1024,
			&entriesread, &totalentries, &resume_handle);
      switch (rc)
	{
	case ERROR_ACCESS_DENIED:
	  fprintf (stderr, "Access denied\n");
	  exit (1);

	case ERROR_MORE_DATA:
	case ERROR_SUCCESS:
	  break;

	default:
	  fprintf (stderr, "NetUserEnum() failed with %ld\n", rc);
	  exit (1);
	}

      for (i = 0; i < entriesread; i++)
	{
	  char username[100];
	  char fullname[100];
	  char homedir_psx[MAX_PATH];
	  char homedir_w32[MAX_PATH];
	  char domain_name[100];
	  DWORD domname_len = 100;
	  char psid_buffer[1024];
	  PSID psid = (PSID) psid_buffer;
	  DWORD sid_length = 1024;
	  SID_NAME_USE acc_type;

	  int uid = buffer[i].usri3_user_id;
	  int gid = buffer[i].usri3_primary_group_id;
	  uni2ansi (buffer[i].usri3_name, username, sizeof (username));
	  uni2ansi (buffer[i].usri3_full_name, fullname, sizeof (fullname));
	  homedir_w32[0] = homedir_psx[0] = '\0';
	  uni2ansi (buffer[i].usri3_home_dir, homedir_w32, sizeof (homedir_w32));
	  if (print_cygpath)
	    cygwin_conv_to_posix_path (homedir_w32, homedir_psx);
	  else
	    psx_dir (homedir_w32, homedir_psx);

	  if (homedir_psx[0] == '\0')
	    {
	      strcat (homedir_psx, passed_home_path);
	      strcat (homedir_psx, username);
	    }

	  if (print_sids)
	    {
	      if (!LookupAccountName (servername ? ansi_srvname : NULL,
				      username,
				      psid, &sid_length,
				      domain_name, &domname_len,
				      &acc_type))
		{
		  fprintf (stderr,
			   "LookupAccountName(%s,%s) failed with error %ld\n",
			   servername ? ansi_srvname : "NULL",
			   username,
			   GetLastError ());
		  continue;
		}
	      else if (acc_type == SidTypeDomain)
		{
		  char domname[356];

		  strcpy (domname, domain_name);
		  strcat (domname, "\\");
		  strcat (domname, username);
		  sid_length = 1024;
		  domname_len = 100;
		  if (!LookupAccountName (servername ? ansi_srvname : NULL,
					  domname,
					  psid, &sid_length,
					  domain_name, &domname_len,
					  &acc_type))
		    {
		      fprintf (stderr,
			       "LookupAccountName(%s,%s) failed with error %ld\n",
			       servername ? ansi_srvname : "NULL",
			       domname,
			       GetLastError ());
		      continue;
		    }
		}
	    }
	  printf ("%s::%d:%d:%s%s%s:%s:/bin/bash\n", username,
		  uid + id_offset,
		  gid + id_offset,
		  fullname,
		  print_sids ? "," : "",
		  print_sids ? put_sid (psid) : "",
		  homedir_psx);
	}

      netapibufferfree (buffer);

    }
  while (rc == ERROR_MORE_DATA);

  if (servername)
    netapibufferfree (servername);

  return 0;
}

int
enum_local_groups (int print_sids)
{
  LOCALGROUP_INFO_0 *buffer;
  DWORD entriesread = 0;
  DWORD totalentries = 0;
  DWORD resume_handle = 0;
  DWORD rc ;

  do
    {
      DWORD i;

      rc = netlocalgroupenum (NULL, 0, (LPBYTE *) & buffer, 1024,
			      &entriesread, &totalentries, &resume_handle);
      switch (rc)
	{
	case ERROR_ACCESS_DENIED:
	  fprintf (stderr, "Access denied\n");
	  exit (1);

	case ERROR_MORE_DATA:
	case ERROR_SUCCESS:
	  break;

	default:
	  fprintf (stderr, "NetLocalGroupEnum() failed with %ld\n", rc);
	  exit (1);
	}

      for (i = 0; i < entriesread; i++)
	{
	  char localgroup_name[100];
	  char domain_name[100];
	  DWORD domname_len = 100;
	  char psid_buffer[1024];
	  PSID psid = (PSID) psid_buffer;
	  DWORD sid_length = 1024;
	  DWORD gid;
	  SID_NAME_USE acc_type;
	  uni2ansi (buffer[i].lgrpi0_name, localgroup_name, sizeof (localgroup_name));

	  if (!LookupAccountName (NULL, localgroup_name, psid,
				  &sid_length, domain_name, &domname_len,
				  &acc_type))
	    {
	      fprintf (stderr, "LookupAccountName(%s) failed with %ld\n",
		       localgroup_name, GetLastError ());
	      continue;
	    }
	  else if (acc_type == SidTypeDomain)
	    {
	      char domname[356];

	      strcpy (domname, domain_name);
	      strcat (domname, "\\");
	      strcat (domname, localgroup_name);
	      sid_length = 1024;
	      domname_len = 100;
	      if (!LookupAccountName (NULL, domname,
				      psid, &sid_length,
				      domain_name, &domname_len,
				      &acc_type))
		{
		  fprintf (stderr,
			   "LookupAccountName(%s) failed with error %ld\n",
			   localgroup_name, GetLastError ());
		  continue;
		}
	    }

	  gid = *GetSidSubAuthority (psid, *GetSidSubAuthorityCount(psid) - 1);

	  printf ("%s:*:%ld:%ld:%s%s::\n", localgroup_name, gid, gid,
		  print_sids ? "," : "",
		  print_sids ? put_sid (psid) : "");
	}

      netapibufferfree (buffer);

    }
  while (rc == ERROR_MORE_DATA);

  return 0;
}

int
usage ()
{
  fprintf (stderr, "Usage: mkpasswd [OPTION]... [domain]\n\n");
  fprintf (stderr, "This program prints a /etc/passwd file to stdout\n\n");
  fprintf (stderr, "Options:\n");
  fprintf (stderr, "   -l,--local              print local user accounts\n");
  fprintf (stderr, "   -d,--domain             print domain accounts (from current domain\n");
  fprintf (stderr, "                           if no domain specified)\n");
  fprintf (stderr, "   -o,--id-offset offset   change the default offset (10000) added to uids\n");
  fprintf (stderr, "                           in domain accounts.\n");
  fprintf (stderr, "   -g,--local-groups       print local group information too\n");
  fprintf (stderr, "                           if no domain specified\n");
  fprintf (stderr, "   -m,--no-mount           don't use mount points for home dir\n");
  fprintf (stderr, "   -s,--no-sids            don't print SIDs in GCOS field\n");
  fprintf (stderr, "                           (this affects ntsec)\n");
  fprintf (stderr, "   -p,--path-to-home path  if user account has no home dir, use\n");
  fprintf (stderr, "                           path instead of /home/\n");
  fprintf (stderr, "   -?,--help               displays this message\n\n");
  fprintf (stderr, "One of `-l', `-d' or `-g' must be given on NT/W2K.\n");
  return 1;
}

struct option longopts[] = {
  {"local", no_argument, NULL, 'l'},
  {"domain", no_argument, NULL, 'd'},
  {"id-offset", required_argument, NULL, 'o'},
  {"local-groups", no_argument, NULL, 'g'},
  {"no-mount", no_argument, NULL, 'm'},
  {"no-sids", no_argument, NULL, 's'},
  {"path-to-home",required_argument, NULL, 'p'},
  {"help", no_argument, NULL, 'h'},
  {0, no_argument, NULL, 0}
};

char opts[] = "ldo:gsmhp:";

int
main (int argc, char **argv)
{
  LPWSTR servername = NULL;
  DWORD rc = ERROR_SUCCESS;
  WCHAR domain_name[200];
  int print_local = 0;
  int print_domain = 0;
  int print_local_groups = 0;
  int domain_name_specified = 0;
  int print_sids = 1;
  int print_cygpath = 1;
  int id_offset = 10000;
  int i;

  char name[256], dom[256], passed_home_path[MAX_PATH];
  DWORD len, len2;
  PSID sid;
  SID_NAME_USE use;

  passed_home_path[0] = '\0';

  if (GetVersion () < 0x80000000)
    if (argc == 1)
      return usage ();
    else
      {
	while ((i = getopt_long (argc, argv, opts, longopts, NULL)) != EOF)
	  switch (i)
	    {
	    case 'l':
	      print_local = 1;
	      break;
	    case 'd':
	      print_domain = 1;
	      break;
	    case 'o':
	      id_offset = strtol (optarg, NULL, 10);
	      break;
	    case 'g':
	      print_local_groups = 1;
	      break;
	    case 's':
	      print_sids = 0;
	      break;
	    case 'm':
	      print_cygpath = 0;
	      break;
            case 'p':
              if (optarg[0] != '/')
	        {
                  fprintf (stderr, "%s: `%s' is not a fully qualified path.\n",
                           argv[0], optarg);
                  return 1;
                }
              strcpy (passed_home_path, optarg);
              if (optarg[strlen (optarg)-1] != '/')
                strcat (passed_home_path, "/");
              break;
	    case 'h':
	      return usage ();
	    default:
	      fprintf (stderr, "Try `%s --help' for more information.\n", argv[0]);
	      return 1;
	    }
	if (!print_local && !print_domain && !print_local_groups)
	  {
	    fprintf (stderr, "%s: Specify one of `-l', `-d' or `-g'\n", argv[0]);
	    return 1;
	  }
	if (optind < argc)
	  {
	    if (!print_domain)
	      {
		fprintf (stderr, "%s: A domain name is only accepted "
				 "when `-d' is given.\n", argv[0]);
		return 1;
	      }
	    mbstowcs (domain_name, argv[optind], (strlen (argv[optind]) + 1));
	    domain_name_specified = 1;
	  }
      }

  if (passed_home_path[0] == '\0')
      strcpy (passed_home_path, "/home/");

  /* This takes Windows 9x/ME into account. */
  if (GetVersion () >= 0x80000000)
    {
      /* Same behaviour as in cygwin/uinfo.cc (internal_getlogin). */
      if (!GetUserName (name, (len = 256, &len)))
	strcpy (name, "unknown");

      printf ("%s::%ld:%ld::%s%s:/bin/bash\n", name,
					     DOMAIN_USER_RID_ADMIN,
					     DOMAIN_ALIAS_RID_ADMINS,
					     passed_home_path,
					     name);

      return 0;
    }

  if (!load_netapi ())
    {
      fprintf (stderr, "Failed loading symbols from netapi32.dll "
		       "with error %lu\n", GetLastError ());
      return 1;
    }

  /*
   * Get `Everyone' group
  */
  if (AllocateAndInitializeSid (&sid_world_auth, 1, SECURITY_WORLD_RID,
				0, 0, 0, 0, 0, 0, 0, &sid))
    {
      if (LookupAccountSid (NULL, sid,
			    name, (len = 256, &len),
			    dom, (len2 = 256, &len),
			    &use))
	printf ("%s:*:%d:%d:%s%s::\n", name,
					 SECURITY_WORLD_RID,
					 SECURITY_WORLD_RID,
					 print_sids ? "," : "",
					 print_sids ? put_sid (sid) : "");
      FreeSid (sid);
    }

  /*
   * Get `system' group
  */
  if (AllocateAndInitializeSid (&sid_nt_auth, 1, SECURITY_LOCAL_SYSTEM_RID,
				0, 0, 0, 0, 0, 0, 0, &sid))
    {
      if (LookupAccountSid (NULL, sid,
			    name, (len = 256, &len),
			    dom, (len2 = 256, &len),
			    &use))
	printf ("%s:*:%d:%d:%s%s::\n", name,
					 SECURITY_LOCAL_SYSTEM_RID,
					 SECURITY_LOCAL_SYSTEM_RID,
					 print_sids ? "," : "",
					 print_sids ? put_sid (sid) : "");
      FreeSid (sid);
    }

  /*
   * Get `administrators' group
  */
  if (!print_local_groups
      && AllocateAndInitializeSid (&sid_nt_auth, 2,
				   SECURITY_BUILTIN_DOMAIN_RID,
				   DOMAIN_ALIAS_RID_ADMINS,
				   0, 0, 0, 0, 0, 0, &sid))
    {
      if (LookupAccountSid (NULL, sid,
			    name, (len = 256, &len),
			    dom, (len2 = 256, &len),
			    &use))
	printf ("%s:*:%ld:%ld:%s%s::\n", name,
					 DOMAIN_ALIAS_RID_ADMINS,
					 DOMAIN_ALIAS_RID_ADMINS,
					 print_sids ? "," : "",
					 print_sids ? put_sid (sid) : "");
      FreeSid (sid);
    }

  if (print_local_groups)
    enum_local_groups (print_sids);

  if (print_domain)
    {
      if (domain_name_specified)
	rc = netgetdcname (NULL, domain_name, (LPBYTE *) & servername);

      else
	rc = netgetdcname (NULL, NULL, (LPBYTE *) & servername);

      if (rc != ERROR_SUCCESS)
	{
	  fprintf (stderr, "Cannot get DC, code = %ld\n", rc);
	  exit (1);
	}

      enum_users (servername, print_sids, print_cygpath, passed_home_path, id_offset);
    }

  if (print_local)
    enum_users (NULL, print_sids, print_cygpath, passed_home_path, 0);

  if (servername)
    netapibufferfree (servername);

  return 0;
}