| 1 | /************************************************* |
| 2 | * Exim - an Internet mail transport agent * |
| 3 | *************************************************/ |
| 4 | |
| 5 | /* Copyright (c) Jeremy Harris 2019 */ |
| 6 | /* See the file NOTICE for conditions of use and distribution. */ |
| 7 | |
| 8 | #include "../exim.h" |
| 9 | #include "lf_functions.h" |
| 10 | #include <jansson.h> |
| 11 | |
| 12 | |
| 13 | |
| 14 | /* All use of allocations will be done against the POOL_SEARCH memory, |
| 15 | which is freed once by search_tidyup(). Make the free call a dummy. |
| 16 | This burns some 300kB in handling a 37kB JSON file, for the benefit of |
| 17 | a fast free. The alternative of staying with malloc is nearly as bad, |
| 18 | eyeballing the activity there are 20% the number of free vs. alloc |
| 19 | calls (before the big bunch at the end). */ |
| 20 | |
| 21 | static void * |
| 22 | json_malloc(size_t nbytes) |
| 23 | { |
| 24 | void * p = store_get((int)nbytes); |
| 25 | /* debug_printf("%s %d: %p\n", __FUNCTION__, (int)nbytes, p); */ |
| 26 | return p; |
| 27 | } |
| 28 | static void |
| 29 | json_free(void * p) |
| 30 | { |
| 31 | /* debug_printf("%s: %p\n", __FUNCTION__, p); */ |
| 32 | } |
| 33 | |
| 34 | /************************************************* |
| 35 | * Open entry point * |
| 36 | *************************************************/ |
| 37 | |
| 38 | /* See local README for interface description */ |
| 39 | |
| 40 | static void * |
| 41 | json_open(uschar *filename, uschar **errmsg) |
| 42 | { |
| 43 | FILE * f; |
| 44 | |
| 45 | json_set_alloc_funcs(json_malloc, json_free); |
| 46 | |
| 47 | if (!(f = Ufopen(filename, "rb"))) |
| 48 | { |
| 49 | int save_errno = errno; |
| 50 | *errmsg = string_open_failed(errno, "%s for json search", filename); |
| 51 | errno = save_errno; |
| 52 | return NULL; |
| 53 | } |
| 54 | return f; |
| 55 | } |
| 56 | |
| 57 | |
| 58 | |
| 59 | /************************************************* |
| 60 | * Check entry point * |
| 61 | *************************************************/ |
| 62 | |
| 63 | static BOOL |
| 64 | json_check(void *handle, uschar *filename, int modemask, uid_t *owners, |
| 65 | gid_t *owngroups, uschar **errmsg) |
| 66 | { |
| 67 | return lf_check_file(fileno((FILE *)handle), filename, S_IFREG, modemask, |
| 68 | owners, owngroups, "json", errmsg) == 0; |
| 69 | } |
| 70 | |
| 71 | |
| 72 | |
| 73 | /************************************************* |
| 74 | * Find entry point for lsearch * |
| 75 | *************************************************/ |
| 76 | |
| 77 | /* See local README for interface description */ |
| 78 | |
| 79 | static int |
| 80 | json_find(void *handle, uschar *filename, const uschar *keystring, int length, |
| 81 | uschar **result, uschar **errmsg, uint *do_cache) |
| 82 | { |
| 83 | FILE * f = handle; |
| 84 | json_t * j, * j0; |
| 85 | json_error_t jerr; |
| 86 | uschar * key; |
| 87 | int sep = 0; |
| 88 | |
| 89 | length = length; /* Keep picky compilers happy */ |
| 90 | do_cache = do_cache; /* Keep picky compilers happy */ |
| 91 | |
| 92 | rewind(f); |
| 93 | if (!(j = json_loadf(f, 0, &jerr))) |
| 94 | { |
| 95 | *errmsg = string_sprintf("json error on open: %.*s\n", |
| 96 | JSON_ERROR_TEXT_LENGTH, jerr.text); |
| 97 | return FAIL; |
| 98 | } |
| 99 | j0 = j; |
| 100 | |
| 101 | for (int k = 1; (key = string_nextinlist(&keystring, &sep, NULL, 0)); k++) |
| 102 | { |
| 103 | BOOL numeric = TRUE; |
| 104 | for (uschar * s = key; *s; s++) if (!isdigit(*s)) { numeric = FALSE; break; } |
| 105 | |
| 106 | if (!(j = numeric |
| 107 | ? json_array_get(j, (size_t) strtoul(CS key, NULL, 10)) |
| 108 | : json_object_get(j, CCS key) |
| 109 | ) ) |
| 110 | { |
| 111 | DEBUG(D_lookup) debug_printf("%s, for key %d: '%s'\n", |
| 112 | numeric |
| 113 | ? US"bad index, or not json array" |
| 114 | : US"no such key, or not json object", |
| 115 | k, key); |
| 116 | json_decref(j0); |
| 117 | return FAIL; |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | switch (json_typeof(j)) |
| 122 | { |
| 123 | case JSON_STRING: |
| 124 | *result = string_copyn(CUS json_string_value(j), json_string_length(j)); |
| 125 | break; |
| 126 | case JSON_INTEGER: |
| 127 | *result = string_sprintf("%" JSON_INTEGER_FORMAT, json_integer_value(j)); |
| 128 | break; |
| 129 | case JSON_REAL: |
| 130 | *result = string_sprintf("%f", json_real_value(j)); |
| 131 | break; |
| 132 | case JSON_TRUE: *result = US"true"; break; |
| 133 | case JSON_FALSE: *result = US"false"; break; |
| 134 | case JSON_NULL: *result = NULL; break; |
| 135 | default: *result = US json_dumps(j, 0); break; |
| 136 | } |
| 137 | json_decref(j0); |
| 138 | return OK; |
| 139 | } |
| 140 | |
| 141 | |
| 142 | |
| 143 | /************************************************* |
| 144 | * Close entry point * |
| 145 | *************************************************/ |
| 146 | |
| 147 | /* See local README for interface description */ |
| 148 | |
| 149 | static void |
| 150 | json_close(void *handle) |
| 151 | { |
| 152 | (void)fclose((FILE *)handle); |
| 153 | } |
| 154 | |
| 155 | |
| 156 | |
| 157 | /************************************************* |
| 158 | * Version reporting entry point * |
| 159 | *************************************************/ |
| 160 | |
| 161 | /* See local README for interface description. */ |
| 162 | |
| 163 | #include "../version.h" |
| 164 | |
| 165 | void |
| 166 | json_version_report(FILE *f) |
| 167 | { |
| 168 | fprintf(f, "Library version: json: Jansonn version %s\n", JANSSON_VERSION); |
| 169 | } |
| 170 | |
| 171 | |
| 172 | static lookup_info json_lookup_info = { |
| 173 | US"json", /* lookup name */ |
| 174 | lookup_absfile, /* uses absolute file name */ |
| 175 | json_open, /* open function */ |
| 176 | json_check, /* check function */ |
| 177 | json_find, /* find function */ |
| 178 | json_close, /* close function */ |
| 179 | NULL, /* no tidy function */ |
| 180 | NULL, /* no quoting function */ |
| 181 | json_version_report /* version reporting */ |
| 182 | }; |
| 183 | |
| 184 | |
| 185 | #ifdef DYNLOOKUP |
| 186 | #define json_lookup_module_info _lookup_module_info |
| 187 | #endif |
| 188 | |
| 189 | static lookup_info *_lookup_list[] = { &json_lookup_info }; |
| 190 | lookup_module_info json_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 }; |
| 191 | |
| 192 | /* End of lookups/json.c */ |