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0756eb3c PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
f9ba5e22 | 5 | /* Copyright (c) University of Cambridge 1995 - 2018 */ |
0756eb3c PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | #include "../exim.h" | |
9 | #include "lf_functions.h" | |
0756eb3c PH |
10 | |
11 | #include <rpcsvc/nis.h> | |
12 | ||
13 | ||
14 | /************************************************* | |
15 | * Open entry point * | |
16 | *************************************************/ | |
17 | ||
18 | /* See local README for interface description. */ | |
19 | ||
e6d225ae | 20 | static void * |
0756eb3c PH |
21 | nisplus_open(uschar *filename, uschar **errmsg) |
22 | { | |
23 | return (void *)(1); /* Just return something non-null */ | |
24 | } | |
25 | ||
26 | ||
27 | ||
28 | /************************************************* | |
29 | * Find entry point * | |
30 | *************************************************/ | |
31 | ||
32 | /* See local README for interface description. The format of queries for a | |
33 | NIS+ search is | |
34 | ||
35 | [field=value,...],table-name | |
36 | or | |
37 | [field=value,...],table-name:result-field-name | |
38 | ||
39 | in other words, a normal NIS+ "indexed name", with an optional result field | |
40 | name tagged on the end after a colon. If there is no result-field name, the | |
41 | yield is the concatenation of all the fields, preceded by their names and an | |
42 | equals sign. */ | |
43 | ||
e6d225ae | 44 | static int |
36a7aaa4 | 45 | nisplus_find(void *handle, uschar *filename, const uschar *query, int length, |
14b3c5bc | 46 | uschar **result, uschar **errmsg, uint *do_cache) |
0756eb3c | 47 | { |
0756eb3c | 48 | int error_error = FAIL; |
36a7aaa4 | 49 | const uschar * field_name = NULL; |
0756eb3c PH |
50 | nis_result *nrt = NULL; |
51 | nis_result *nre = NULL; | |
52 | nis_object *tno, *eno; | |
53 | struct entry_obj *eo; | |
54 | struct table_obj *ta; | |
36a7aaa4 | 55 | const uschar * p = query + length; |
acec9514 | 56 | gstring * yield = NULL; |
0756eb3c PH |
57 | |
58 | do_cache = do_cache; /* Placate picky compilers */ | |
59 | ||
60 | /* Search backwards for a colon to see if a result field name | |
61 | has been given. */ | |
62 | ||
63 | while (p > query && p[-1] != ':') p--; | |
64 | ||
36a7aaa4 | 65 | if (p > query) /* get the query without the result-field */ |
0756eb3c | 66 | { |
36a7aaa4 | 67 | uint len = p-1 - query; |
0756eb3c | 68 | field_name = p; |
36a7aaa4 JH |
69 | query = string_copyn(query, len); |
70 | p = query + len; | |
0756eb3c | 71 | } |
36a7aaa4 JH |
72 | else |
73 | p = query + length; | |
0756eb3c PH |
74 | |
75 | /* Now search backwards to find the comma that starts the | |
76 | table name. */ | |
77 | ||
78 | while (p > query && p[-1] != ',') p--; | |
79 | if (p <= query) | |
80 | { | |
81 | *errmsg = US"NIS+ query malformed"; | |
82 | error_error = DEFER; | |
83 | goto NISPLUS_EXIT; | |
84 | } | |
85 | ||
86 | /* Look up the data for the table, in order to get the field names, | |
87 | check that we got back a table, and set up pointers so the field | |
88 | names can be scanned. */ | |
89 | ||
90 | nrt = nis_lookup(CS p, EXPAND_NAME | NO_CACHE); | |
91 | if (nrt->status != NIS_SUCCESS) | |
92 | { | |
93 | *errmsg = string_sprintf("NIS+ error accessing %s table: %s", p, | |
94 | nis_sperrno(nrt->status)); | |
95 | if (nrt->status != NIS_NOTFOUND && nrt->status != NIS_NOSUCHTABLE) | |
96 | error_error = DEFER; | |
97 | goto NISPLUS_EXIT; | |
98 | } | |
99 | tno = nrt->objects.objects_val; | |
100 | if (tno->zo_data.zo_type != TABLE_OBJ) | |
101 | { | |
102 | *errmsg = string_sprintf("NIS+ error: %s is not a table", p); | |
103 | goto NISPLUS_EXIT; | |
104 | } | |
36a7aaa4 | 105 | ta = &tno->zo_data.objdata_u.ta_data; |
0756eb3c PH |
106 | |
107 | /* Now look up the entry in the table, check that we got precisely one | |
108 | object and that it is a table entry. */ | |
109 | ||
110 | nre = nis_list(CS query, EXPAND_NAME, NULL, NULL); | |
111 | if (nre->status != NIS_SUCCESS) | |
112 | { | |
113 | *errmsg = string_sprintf("NIS+ error accessing entry %s: %s", | |
114 | query, nis_sperrno(nre->status)); | |
115 | goto NISPLUS_EXIT; | |
116 | } | |
117 | if (nre->objects.objects_len > 1) | |
118 | { | |
119 | *errmsg = string_sprintf("NIS+ returned more than one object for %s", | |
120 | query); | |
121 | goto NISPLUS_EXIT; | |
122 | } | |
123 | else if (nre->objects.objects_len < 1) | |
124 | { | |
125 | *errmsg = string_sprintf("NIS+ returned no data for %s", query); | |
126 | goto NISPLUS_EXIT; | |
127 | } | |
128 | eno = nre->objects.objects_val; | |
129 | if (eno->zo_data.zo_type != ENTRY_OBJ) | |
130 | { | |
131 | *errmsg = string_sprintf("NIS+ error: %s is not an entry", query); | |
132 | goto NISPLUS_EXIT; | |
133 | } | |
134 | ||
135 | /* Scan the columns in the entry and in the table. If a result field | |
136 | was given, look for that field; otherwise concatenate all the fields | |
137 | with their names. */ | |
138 | ||
139 | eo = &(eno->zo_data.objdata_u.en_data); | |
d7978c0f | 140 | for (int i = 0; i < eo->en_cols.en_cols_len; i++) |
0756eb3c PH |
141 | { |
142 | table_col *tc = ta->ta_cols.ta_cols_val + i; | |
143 | entry_col *ec = eo->en_cols.en_cols_val + i; | |
144 | int len = ec->ec_value.ec_value_len; | |
145 | uschar *value = US ec->ec_value.ec_value_val; | |
146 | ||
147 | /* The value may be NULL for a zero-length field. Turn this into an | |
148 | empty string for consistency. Remove trailing whitespace and zero | |
149 | bytes. */ | |
150 | ||
8238bc7b JH |
151 | if (!value) value = US""; |
152 | else | |
0756eb3c PH |
153 | while (len > 0 && (value[len-1] == 0 || isspace(value[len-1]))) |
154 | len--; | |
155 | ||
156 | /* Concatenate all fields if no specific one selected */ | |
157 | ||
36a7aaa4 | 158 | if (!field_name) |
0756eb3c | 159 | { |
8238bc7b | 160 | yield = string_cat (yield, US tc->tc_name); |
acec9514 | 161 | yield = string_catn(yield, US"=", 1); |
0756eb3c PH |
162 | |
163 | /* Quote the value if it contains spaces or is empty */ | |
164 | ||
165 | if (value[0] == 0 || Ustrchr(value, ' ') != NULL) | |
166 | { | |
acec9514 | 167 | yield = string_catn(yield, US"\"", 1); |
d7978c0f | 168 | for (int j = 0; j < len; j++) |
0756eb3c PH |
169 | { |
170 | if (value[j] == '\"' || value[j] == '\\') | |
acec9514 JH |
171 | yield = string_catn(yield, US"\\", 1); |
172 | yield = string_catn(yield, value+j, 1); | |
0756eb3c | 173 | } |
acec9514 | 174 | yield = string_catn(yield, US"\"", 1); |
0756eb3c | 175 | } |
acec9514 | 176 | else |
8dcf2dc4 | 177 | yield = string_catn(yield, value, len); |
0756eb3c | 178 | |
acec9514 | 179 | yield = string_catn(yield, US" ", 1); |
0756eb3c PH |
180 | } |
181 | ||
182 | /* When the specified field is found, grab its data and finish */ | |
183 | ||
184 | else if (Ustrcmp(field_name, tc->tc_name) == 0) | |
185 | { | |
acec9514 | 186 | yield = string_catn(yield, value, len); |
0756eb3c PH |
187 | goto NISPLUS_EXIT; |
188 | } | |
189 | } | |
190 | ||
191 | /* Error if a field name was specified and we didn't find it; if no | |
192 | field name, ensure the concatenated data is zero-terminated. */ | |
193 | ||
acec9514 | 194 | if (field_name) |
0756eb3c PH |
195 | *errmsg = string_sprintf("NIS+ field %s not found for %s", field_name, |
196 | query); | |
197 | else | |
f3ebb786 | 198 | gstring_release_unused(yield); |
0756eb3c | 199 | |
36a7aaa4 | 200 | /* Free result store before finishing. */ |
0756eb3c PH |
201 | |
202 | NISPLUS_EXIT: | |
acec9514 JH |
203 | if (nrt) nis_freeresult(nrt); |
204 | if (nre) nis_freeresult(nre); | |
0756eb3c | 205 | |
acec9514 | 206 | if (yield) |
0756eb3c | 207 | { |
acec9514 | 208 | *result = string_from_gstring(yield); |
0756eb3c PH |
209 | return OK; |
210 | } | |
211 | ||
212 | return error_error; /* FAIL or DEFER */ | |
213 | } | |
214 | ||
215 | ||
216 | ||
217 | /************************************************* | |
218 | * Quote entry point * | |
219 | *************************************************/ | |
220 | ||
221 | /* The only quoting that is necessary for NIS+ is to double any doublequote | |
222 | characters. No options are recognized. | |
223 | ||
224 | Arguments: | |
225 | s the string to be quoted | |
226 | opt additional option text or NULL if none | |
227 | ||
228 | Returns: the processed string or NULL for a bad option | |
229 | */ | |
230 | ||
e6d225ae | 231 | static uschar * |
0756eb3c PH |
232 | nisplus_quote(uschar *s, uschar *opt) |
233 | { | |
234 | int count = 0; | |
235 | uschar *quoted; | |
236 | uschar *t = s; | |
237 | ||
238 | if (opt != NULL) return NULL; /* No options recognized */ | |
239 | ||
240 | while (*t != 0) if (*t++ == '\"') count++; | |
241 | if (count == 0) return s; | |
242 | ||
f3ebb786 | 243 | t = quoted = store_get(Ustrlen(s) + count + 1, is_tainted(s)); |
0756eb3c PH |
244 | |
245 | while (*s != 0) | |
246 | { | |
247 | *t++ = *s; | |
248 | if (*s++ == '\"') *t++ = '\"'; | |
249 | } | |
250 | ||
251 | *t = 0; | |
252 | return quoted; | |
253 | } | |
254 | ||
6545de78 PP |
255 | |
256 | /************************************************* | |
257 | * Version reporting entry point * | |
258 | *************************************************/ | |
259 | ||
260 | /* See local README for interface description. */ | |
261 | ||
262 | #include "../version.h" | |
263 | ||
264 | void | |
265 | nisplus_version_report(FILE *f) | |
266 | { | |
267 | #ifdef DYNLOOKUP | |
268 | fprintf(f, "Library version: NIS+: Exim version %s\n", EXIM_VERSION_STR); | |
269 | #endif | |
270 | } | |
271 | ||
272 | ||
e6d225ae DW |
273 | static lookup_info _lookup_info = { |
274 | US"nisplus", /* lookup name */ | |
275 | lookup_querystyle, /* query-style lookup */ | |
276 | nisplus_open, /* open function */ | |
277 | NULL, /* check function */ | |
278 | nisplus_find, /* find function */ | |
279 | NULL, /* no close function */ | |
280 | NULL, /* no tidy function */ | |
6545de78 PP |
281 | nisplus_quote, /* quoting function */ |
282 | nisplus_version_report /* version reporting */ | |
e6d225ae DW |
283 | }; |
284 | ||
285 | #ifdef DYNLOOKUP | |
286 | #define nisplus_lookup_module_info _lookup_module_info | |
287 | #endif | |
288 | ||
289 | static lookup_info *_lookup_list[] = { &_lookup_info }; | |
290 | lookup_module_info nisplus_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 }; | |
0756eb3c PH |
291 | |
292 | /* End of lookups/nisplus.c */ |