src/src/lookups/sqlite.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2018 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8 #include "../exim.h"
   9 #include "lf_functions.h"
  10
  11 #include <sqlite3.h>
  12
  13
  14 /*************************************************
  15 *              Open entry point                  *
  16 *************************************************/
  17
  18 /* See local README for interface description. */
  19
  20 static void *
  21 sqlite_open(const uschar * filename, uschar ** errmsg)
  22 {
  23 sqlite3 *db = NULL;
  24 int ret;
  25
  26 if (!filename || !*filename) filename = sqlite_dbfile;
  27 if (*filename != '/')
  28   *errmsg = US"absolute file name expected for \"sqlite\" lookup";
  29 else if ((ret = sqlite3_open(CCS filename, &db)) != 0)
  30   {
  31   *errmsg = (void *)sqlite3_errmsg(db);
  32   DEBUG(D_lookup) debug_printf_indent("Error opening database: %s\n", *errmsg);
  33   }
  34
  35 sqlite3_busy_timeout(db, 1000 * sqlite_lock_timeout);
  36 return db;
  37 }
  38
  39
  40 /*************************************************
  41 *               Find entry point                 *
  42 *************************************************/
  43
  44 /* See local README for interface description. */
  45
  46 static int
  47 sqlite_callback(void *arg, int argc, char **argv, char **azColName)
  48 {
  49 gstring * res = *(gstring **)arg;
  50
  51 /* For second and subsequent results, insert \n */
  52
  53 if (res)
  54   res = string_catn(res, US"\n", 1);
  55
  56 if (argc > 1)
  57   {
  58   /* For multiple fields, include the field name too */
  59   for (int i = 0; i < argc; i++)
  60     {
  61     uschar *value = US((argv[i] != NULL)? argv[i]:"<NULL>");
  62     res = lf_quote(US azColName[i], value, Ustrlen(value), res);
  63     }
  64   }
  65
  66 else
  67   res = string_cat(res, argv[0] ? US argv[0] : US "<NULL>");
  68
  69 *(gstring **)arg = res;
  70 return 0;
  71 }
  72
  73
  74 static int
  75 sqlite_find(void * handle, const uschar * filename, const uschar * query,
  76   int length, uschar ** result, uschar ** errmsg, uint * do_cache,
  77   const uschar * opts)
  78 {
  79 int ret;
  80 gstring * res = NULL;
  81
  82 ret = sqlite3_exec(handle, CS query, sqlite_callback, &res, CSS errmsg);
  83 if (ret != SQLITE_OK)
  84   {
  85   debug_printf_indent("sqlite3_exec failed: %s\n", *errmsg);
  86   return FAIL;
  87   }
  88
  89 if (!res) *do_cache = 0;
  90
  91 *result = string_from_gstring(res);
  92 return OK;
  93 }
  94
  95
  96
  97 /*************************************************
  98 *               Close entry point                *
  99 *************************************************/
 100
 101 /* See local README for interface description. */
 102
 103 static void sqlite_close(void *handle)
 104 {
 105 sqlite3_close(handle);
 106 }
 107
 108
 109
 110 /*************************************************
 111 *               Quote entry point                *
 112 *************************************************/
 113
 114 /* From what I have found so far, the only character that needs to be quoted
 115 for sqlite is the single quote, and it is quoted by doubling.
 116
 117 Arguments:
 118   s          the string to be quoted
 119   opt        additional option text or NULL if none
 120
 121 Returns:     the processed string or NULL for a bad option
 122 */
 123
 124 static uschar *
 125 sqlite_quote(uschar *s, uschar *opt)
 126 {
 127 register int c;
 128 int count = 0;
 129 uschar *t = s;
 130 uschar *quoted;
 131
 132 if (opt != NULL) return NULL;     /* No options recognized */
 133
 134 while ((c = *t++) != 0) if (c == '\'') count++;
 135
 136 if (count == 0) return s;
 137 t = quoted = store_get(Ustrlen(s) + count + 1, is_tainted(s));
 138
 139 while ((c = *s++) != 0)
 140   {
 141   if (c == '\'') *t++ = '\'';
 142   *t++ = c;
 143   }
 144
 145 *t = 0;
 146 return quoted;
 147 }
 148
 149
 150
 151 /*************************************************
 152 *         Version reporting entry point          *
 153 *************************************************/
 154
 155 /* See local README for interface description. */
 156
 157 #include "../version.h"
 158
 159 void
 160 sqlite_version_report(FILE *f)
 161 {
 162 fprintf(f, "Library version: SQLite: Compile: %s\n"
 163            "                         Runtime: %s\n",
 164         SQLITE_VERSION, sqlite3_libversion());
 165 #ifdef DYNLOOKUP
 166 fprintf(f, "                         Exim version %s\n", EXIM_VERSION_STR);
 167 #endif
 168 }
 169
 170 static lookup_info _lookup_info = {
 171   .name = US"sqlite",                   /* lookup name */
 172   .type = lookup_absfilequery,          /* query-style lookup, starts with file name */
 173   .open = sqlite_open,                  /* open function */
 174   .check = NULL,                        /* no check function */
 175   .find = sqlite_find,                  /* find function */
 176   .close = sqlite_close,                /* close function */
 177   .tidy = NULL,                         /* no tidy function */
 178   .quote = sqlite_quote,                /* quoting function */
 179   .version_report = sqlite_version_report          /* version reporting */
 180 };
 181
 182 #ifdef DYNLOOKUP
 183 #define sqlite_lookup_module_info _lookup_module_info
 184 #endif
 185
 186 static lookup_info *_lookup_list[] = { &_lookup_info };
 187 lookup_module_info sqlite_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 };
 188
 189 /* End of lookups/sqlite.c */