/* $Cambridge: exim/src/src/lookups/nisplus.c,v 1.5 2009/11/16 19:50:38 nm4 Exp $ */ /************************************************* * Exim - an Internet mail transport agent * *************************************************/ /* Copyright (c) University of Cambridge 1995 - 2009 */ /* See the file NOTICE for conditions of use and distribution. */ #include "../exim.h" #include "lf_functions.h" #include /************************************************* * Open entry point * *************************************************/ /* See local README for interface description. */ static void * nisplus_open(uschar *filename, uschar **errmsg) { return (void *)(1); /* Just return something non-null */ } /************************************************* * Find entry point * *************************************************/ /* See local README for interface description. The format of queries for a NIS+ search is [field=value,...],table-name or [field=value,...],table-name:result-field-name in other words, a normal NIS+ "indexed name", with an optional result field name tagged on the end after a colon. If there is no result-field name, the yield is the concatenation of all the fields, preceded by their names and an equals sign. */ static int nisplus_find(void *handle, uschar *filename, uschar *query, int length, uschar **result, uschar **errmsg, BOOL *do_cache) { int i; int ssize = 0; int offset = 0; int error_error = FAIL; uschar *field_name = NULL; nis_result *nrt = NULL; nis_result *nre = NULL; nis_object *tno, *eno; struct entry_obj *eo; struct table_obj *ta; uschar *p = query + length; uschar *yield = NULL; do_cache = do_cache; /* Placate picky compilers */ /* Search backwards for a colon to see if a result field name has been given. */ while (p > query && p[-1] != ':') p--; if (p > query) { field_name = p; p[-1] = 0; } else p = query + length; /* Now search backwards to find the comma that starts the table name. */ while (p > query && p[-1] != ',') p--; if (p <= query) { *errmsg = US"NIS+ query malformed"; error_error = DEFER; goto NISPLUS_EXIT; } /* Look up the data for the table, in order to get the field names, check that we got back a table, and set up pointers so the field names can be scanned. */ nrt = nis_lookup(CS p, EXPAND_NAME | NO_CACHE); if (nrt->status != NIS_SUCCESS) { *errmsg = string_sprintf("NIS+ error accessing %s table: %s", p, nis_sperrno(nrt->status)); if (nrt->status != NIS_NOTFOUND && nrt->status != NIS_NOSUCHTABLE) error_error = DEFER; goto NISPLUS_EXIT; } tno = nrt->objects.objects_val; if (tno->zo_data.zo_type != TABLE_OBJ) { *errmsg = string_sprintf("NIS+ error: %s is not a table", p); goto NISPLUS_EXIT; } ta = &(tno->zo_data.objdata_u.ta_data); /* Now look up the entry in the table, check that we got precisely one object and that it is a table entry. */ nre = nis_list(CS query, EXPAND_NAME, NULL, NULL); if (nre->status != NIS_SUCCESS) { *errmsg = string_sprintf("NIS+ error accessing entry %s: %s", query, nis_sperrno(nre->status)); goto NISPLUS_EXIT; } if (nre->objects.objects_len > 1) { *errmsg = string_sprintf("NIS+ returned more than one object for %s", query); goto NISPLUS_EXIT; } else if (nre->objects.objects_len < 1) { *errmsg = string_sprintf("NIS+ returned no data for %s", query); goto NISPLUS_EXIT; } eno = nre->objects.objects_val; if (eno->zo_data.zo_type != ENTRY_OBJ) { *errmsg = string_sprintf("NIS+ error: %s is not an entry", query); goto NISPLUS_EXIT; } /* Scan the columns in the entry and in the table. If a result field was given, look for that field; otherwise concatenate all the fields with their names. */ eo = &(eno->zo_data.objdata_u.en_data); for (i = 0; i < eo->en_cols.en_cols_len; i++) { table_col *tc = ta->ta_cols.ta_cols_val + i; entry_col *ec = eo->en_cols.en_cols_val + i; int len = ec->ec_value.ec_value_len; uschar *value = US ec->ec_value.ec_value_val; /* The value may be NULL for a zero-length field. Turn this into an empty string for consistency. Remove trailing whitespace and zero bytes. */ if (value == NULL) value = US""; else while (len > 0 && (value[len-1] == 0 || isspace(value[len-1]))) len--; /* Concatenate all fields if no specific one selected */ if (field_name == NULL) { yield = string_cat(yield, &ssize, &offset,US tc->tc_name, Ustrlen(tc->tc_name)); yield = string_cat(yield, &ssize, &offset, US"=", 1); /* Quote the value if it contains spaces or is empty */ if (value[0] == 0 || Ustrchr(value, ' ') != NULL) { int j; yield = string_cat(yield, &ssize, &offset, US"\"", 1); for (j = 0; j < len; j++) { if (value[j] == '\"' || value[j] == '\\') yield = string_cat(yield, &ssize, &offset, US"\\", 1); yield = string_cat(yield, &ssize, &offset, value+j, 1); } yield = string_cat(yield, &ssize, &offset, US"\"", 1); } else yield = string_cat(yield, &ssize, &offset, value, len); yield = string_cat(yield, &ssize, &offset, US" ", 1); } /* When the specified field is found, grab its data and finish */ else if (Ustrcmp(field_name, tc->tc_name) == 0) { yield = string_copyn(value, len); goto NISPLUS_EXIT; } } /* Error if a field name was specified and we didn't find it; if no field name, ensure the concatenated data is zero-terminated. */ if (field_name != NULL) *errmsg = string_sprintf("NIS+ field %s not found for %s", field_name, query); else { yield[offset] = 0; store_reset(yield + offset + 1); } /* Restore the colon in the query, and free result store before finishing. */ NISPLUS_EXIT: if (field_name != NULL) field_name[-1] = ':'; if (nrt != NULL) nis_freeresult(nrt); if (nre != NULL) nis_freeresult(nre); if (yield != NULL) { *result = yield; return OK; } return error_error; /* FAIL or DEFER */ } /************************************************* * Quote entry point * *************************************************/ /* The only quoting that is necessary for NIS+ is to double any doublequote characters. No options are recognized. 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 * nisplus_quote(uschar *s, uschar *opt) { int count = 0; uschar *quoted; uschar *t = s; if (opt != NULL) return NULL; /* No options recognized */ while (*t != 0) if (*t++ == '\"') count++; if (count == 0) return s; t = quoted = store_get(Ustrlen(s) + count + 1); while (*s != 0) { *t++ = *s; if (*s++ == '\"') *t++ = '\"'; } *t = 0; return quoted; } /************************************************* * Version reporting entry point * *************************************************/ /* See local README for interface description. */ #include "../version.h" void nisplus_version_report(FILE *f) { #ifdef DYNLOOKUP fprintf(f, "Library version: NIS+: Exim version %s\n", EXIM_VERSION_STR); #endif } static lookup_info _lookup_info = { US"nisplus", /* lookup name */ lookup_querystyle, /* query-style lookup */ nisplus_open, /* open function */ NULL, /* check function */ nisplus_find, /* find function */ NULL, /* no close function */ NULL, /* no tidy function */ nisplus_quote, /* quoting function */ nisplus_version_report /* version reporting */ }; #ifdef DYNLOOKUP #define nisplus_lookup_module_info _lookup_module_info #endif static lookup_info *_lookup_list[] = { &_lookup_info }; lookup_module_info nisplus_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 }; /* End of lookups/nisplus.c */