/*************************************************
*     Exim - an Internet mail transport agent    *
*************************************************/

/* Copyright (c) University of Cambridge 1995 - 2018 */
/* See the file NOTICE for conditions of use and distribution. */

#include "../exim.h"
#include "lf_functions.h"

#include <sqlite3.h>


/*************************************************
*              Open entry point                  *
*************************************************/

/* See local README for interface description. */

static void *
sqlite_open(const uschar * filename, uschar ** errmsg)
{
sqlite3 *db = NULL;
int ret;

if (!filename || !*filename) filename = sqlite_dbfile;
if (*filename != '/')
  *errmsg = US"absolute file name expected for \"sqlite\" lookup";
else if ((ret = sqlite3_open(CCS filename, &db)) != 0)
  {
  *errmsg = (void *)sqlite3_errmsg(db);
  DEBUG(D_lookup) debug_printf_indent("Error opening database: %s\n", *errmsg);
  }

sqlite3_busy_timeout(db, 1000 * sqlite_lock_timeout);
return db;
}


/*************************************************
*               Find entry point                 *
*************************************************/

/* See local README for interface description. */

static int
sqlite_callback(void *arg, int argc, char **argv, char **azColName)
{
gstring * res = *(gstring **)arg;

/* For second and subsequent results, insert \n */

if (res)
  res = string_catn(res, US"\n", 1);

if (argc > 1)
  {
  /* For multiple fields, include the field name too */
  for (int i = 0; i < argc; i++)
    {
    uschar *value = US((argv[i] != NULL)? argv[i]:"<NULL>");
    res = lf_quote(US azColName[i], value, Ustrlen(value), res);
    }
  }

else
  res = string_cat(res, argv[0] ? US argv[0] : US "<NULL>");

*(gstring **)arg = res;
return 0;
}


static int
sqlite_find(void * handle, const uschar * filename, const uschar * query,
  int length, uschar ** result, uschar ** errmsg, uint * do_cache)
{
int ret;
gstring * res = NULL;

ret = sqlite3_exec(handle, CS query, sqlite_callback, &res, (char **)errmsg);
if (ret != SQLITE_OK)
  {
  debug_printf_indent("sqlite3_exec failed: %s\n", *errmsg);
  return FAIL;
  }

if (!res) *do_cache = 0;

*result = string_from_gstring(res);
return OK;
}



/*************************************************
*               Close entry point                *
*************************************************/

/* See local README for interface description. */

static void sqlite_close(void *handle)
{
sqlite3_close(handle);
}



/*************************************************
*               Quote entry point                *
*************************************************/

/* From what I have found so far, the only character that needs to be quoted
for sqlite is the single quote, and it is quoted by doubling.

Arguments:
  s          the string to be quoted
  opt        additional option text or NULL if none

Returns:     the processed string or NULL for a bad option
*/

static uschar *
sqlite_quote(uschar *s, uschar *opt)
{
register int c;
int count = 0;
uschar *t = s;
uschar *quoted;

if (opt != NULL) return NULL;     /* No options recognized */

while ((c = *t++) != 0) if (c == '\'') count++;

if (count == 0) return s;
t = quoted = store_get(Ustrlen(s) + count + 1, is_tainted(s));

while ((c = *s++) != 0)
  {
  if (c == '\'') *t++ = '\'';
  *t++ = c;
  }

*t = 0;
return quoted;
}



/*************************************************
*         Version reporting entry point          *
*************************************************/

/* See local README for interface description. */

#include "../version.h"

void
sqlite_version_report(FILE *f)
{
fprintf(f, "Library version: SQLite: Compile: %s\n"
           "                         Runtime: %s\n",
        SQLITE_VERSION, sqlite3_libversion());
#ifdef DYNLOOKUP
fprintf(f, "                         Exim version %s\n", EXIM_VERSION_STR);
#endif
}

static lookup_info _lookup_info = {
  US"sqlite",                    /* lookup name */
  lookup_absfilequery,           /* query-style lookup, starts with file name */
  sqlite_open,                   /* open function */
  NULL,                          /* no check function */
  sqlite_find,                   /* find function */
  sqlite_close,                  /* close function */
  NULL,                          /* no tidy function */
  sqlite_quote,                  /* quoting function */
  sqlite_version_report          /* version reporting */
};

#ifdef DYNLOOKUP
#define sqlite_lookup_module_info _lookup_module_info
#endif

static lookup_info *_lookup_list[] = { &_lookup_info };
lookup_module_info sqlite_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 };

/* End of lookups/sqlite.c */