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Diffstat (limited to 'src/global/maps.c')
| -rw-r--r-- | src/global/maps.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/src/global/maps.c b/src/global/maps.c new file mode 100644 index 0000000..7c84e9a --- /dev/null +++ b/src/global/maps.c @@ -0,0 +1,337 @@ +/*++ +/* NAME +/* maps 3 +/* SUMMARY +/* multi-dictionary search +/* SYNOPSIS +/* #include <maps.h> +/* +/* MAPS *maps_create(title, map_names, flags) +/* const char *title; +/* const char *map_names; +/* int flags; +/* +/* const char *maps_find(maps, key, flags) +/* MAPS *maps; +/* const char *key; +/* int flags; +/* +/* const char *maps_file_find(maps, key, flags) +/* MAPS *maps; +/* const char *key; +/* int flags; +/* +/* MAPS *maps_free(maps) +/* MAPS *maps; +/* DESCRIPTION +/* This module implements multi-dictionary searches. it goes +/* through the high-level dictionary interface and does file +/* locking. Dictionaries are opened read-only, and in-memory +/* dictionary instances are shared. +/* +/* maps_create() takes list of type:name pairs and opens the +/* named dictionaries. +/* The result is a handle that must be specified along with all +/* other maps_xxx() operations. +/* See dict_open(3) for a description of flags. +/* This includes the flags that specify preferences for search +/* string case folding. +/* +/* maps_find() searches the specified list of dictionaries +/* in the specified order for the named key. The result is in +/* memory that is overwritten upon each call. +/* The flags argument is either 0 or specifies a filter: +/* for example, DICT_FLAG_FIXED | DICT_FLAG_PATTERN selects +/* dictionaries that have fixed keys or pattern keys. +/* +/* maps_file_find() implements maps_find() but also decodes +/* the base64 lookup result. This requires that the maps are +/* opened with DICT_FLAG_SRC_RHS_IS_FILE. +/* +/* maps_free() releases storage claimed by maps_create() +/* and conveniently returns a null pointer. +/* +/* Arguments: +/* .IP title +/* String used for diagnostics. Typically one specifies the +/* type of information stored in the lookup tables. +/* .IP map_names +/* Null-terminated string with type:name dictionary specifications, +/* separated by whitespace or commas. +/* .IP flags +/* With maps_create(), flags that are passed to dict_open(). +/* With maps_find(), flags that control searching behavior +/* as documented above. +/* .IP maps +/* A result from maps_create(). +/* .IP key +/* Null-terminated string with a lookup key. Table lookup is case +/* sensitive. +/* DIAGNOSTICS +/* Panic: inappropriate use; fatal errors: out of memory, unable +/* to open database. Warnings: null string lookup result. +/* +/* maps_find() returns a null pointer when the requested +/* information was not found, and logs a warning when the +/* lookup failed due to error. The maps->error value indicates +/* if the last lookup failed due to error. +/* BUGS +/* The dictionary name space is flat, so dictionary names allocated +/* by maps_create() may collide with dictionary names allocated by +/* other methods. +/* +/* This functionality could be implemented by allowing the user to +/* specify dictionary search paths to dict_lookup() or dict_eval(). +/* However, that would either require that the dict(3) module adopts +/* someone else's list notation syntax, or that the dict(3) module +/* imposes syntax restrictions onto other software, neither of which +/* is desirable. +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/*--*/ + +/* System library. */ + +#include <sys_defs.h> +#include <string.h> + +/* Utility library. */ + +#include <argv.h> +#include <mymalloc.h> +#include <msg.h> +#include <dict.h> +#include <stringops.h> +#include <split_at.h> + +/* Global library. */ + +#include "mail_conf.h" +#include "maps.h" + +/* maps_create - initialize */ + +MAPS *maps_create(const char *title, const char *map_names, int dict_flags) +{ + const char *myname = "maps_create"; + char *temp; + char *bufp; + static char sep[] = CHARS_COMMA_SP; + static char parens[] = CHARS_BRACE; + MAPS *maps; + char *map_type_name; + VSTRING *map_type_name_flags; + DICT *dict; + + /* + * Initialize. + */ + maps = (MAPS *) mymalloc(sizeof(*maps)); + maps->title = mystrdup(title); + maps->argv = argv_alloc(2); + maps->error = 0; + + /* + * For each specified type:name pair, either register a new dictionary, + * or increment the reference count of an existing one. + */ + if (*map_names) { + bufp = temp = mystrdup(map_names); + map_type_name_flags = vstring_alloc(10); + +#define OPEN_FLAGS O_RDONLY + + while ((map_type_name = mystrtokq(&bufp, sep, parens)) != 0) { + vstring_sprintf(map_type_name_flags, "%s(%o,%s)", + map_type_name, OPEN_FLAGS, + dict_flags_str(dict_flags)); + if ((dict = dict_handle(vstring_str(map_type_name_flags))) == 0) + dict = dict_open(map_type_name, OPEN_FLAGS, dict_flags); + if ((dict->flags & dict_flags) != dict_flags) + msg_panic("%s: map %s has flags 0%o, want flags 0%o", + myname, map_type_name, dict->flags, dict_flags); + dict_register(vstring_str(map_type_name_flags), dict); + argv_add(maps->argv, vstring_str(map_type_name_flags), ARGV_END); + } + myfree(temp); + vstring_free(map_type_name_flags); + } + return (maps); +} + +/* maps_find - search a list of dictionaries */ + +const char *maps_find(MAPS *maps, const char *name, int flags) +{ + const char *myname = "maps_find"; + char **map_name; + const char *expansion; + DICT *dict; + + /* + * In case of return without map lookup (empty name or no maps). + */ + maps->error = 0; + + /* + * Temp. workaround, for buggy callers that pass zero-length keys when + * given partial addresses. + */ + if (*name == 0) + return (0); + + for (map_name = maps->argv->argv; *map_name; map_name++) { + if ((dict = dict_handle(*map_name)) == 0) + msg_panic("%s: dictionary not found: %s", myname, *map_name); + if (flags != 0 && (dict->flags & flags) == 0) + continue; + if ((expansion = dict_get(dict, name)) != 0) { + if (*expansion == 0) { + msg_warn("%s lookup of %s returns an empty string result", + maps->title, name); + msg_warn("%s should return NO RESULT in case of NOT FOUND", + maps->title); + maps->error = DICT_ERR_CONFIG; + return (0); + } + if (msg_verbose) + msg_info("%s: %s: %s: %s = %.100s%s", myname, maps->title, + *map_name, name, expansion, + strlen(expansion) > 100 ? "..." : ""); + return (expansion); + } else if ((maps->error = dict->error) != 0) { + msg_warn("%s:%s lookup error for \"%s\"", + dict->type, dict->name, name); + break; + } + } + if (msg_verbose) + msg_info("%s: %s: %s: %s", myname, maps->title, name, maps->error ? + "search aborted" : "not found"); + return (0); +} + +/* maps_file_find - search a list of dictionaries and base64 decode */ + +const char *maps_file_find(MAPS *maps, const char *name, int flags) +{ + const char *myname = "maps_file_find"; + char **map_name; + const char *expansion; + DICT *dict; + VSTRING *unb64; + char *err; + + /* + * In case of return without map lookup (empty name or no maps). + */ + maps->error = 0; + + /* + * Temp. workaround, for buggy callers that pass zero-length keys when + * given partial addresses. + */ + if (*name == 0) + return (0); + + for (map_name = maps->argv->argv; *map_name; map_name++) { + if ((dict = dict_handle(*map_name)) == 0) + msg_panic("%s: dictionary not found: %s", myname, *map_name); + if ((dict->flags & DICT_FLAG_SRC_RHS_IS_FILE) == 0) + msg_panic("%s: %s: opened without DICT_FLAG_SRC_RHS_IS_FILE", + myname, maps->title); + if (flags != 0 && (dict->flags & flags) == 0) + continue; + if ((expansion = dict_get(dict, name)) != 0) { + if (*expansion == 0) { + msg_warn("%s lookup of %s returns an empty string result", + maps->title, name); + msg_warn("%s should return NO RESULT in case of NOT FOUND", + maps->title); + maps->error = DICT_ERR_CONFIG; + return (0); + } + if (msg_verbose) + msg_info("%s: %s: %s: %s = %.100s%s", myname, maps->title, + *map_name, name, expansion, + strlen(expansion) > 100 ? "..." : ""); + if ((unb64 = dict_file_from_b64(dict, expansion)) == 0) { + err = dict_file_get_error(dict); + msg_warn("table %s:%s: key %s: %s", + dict->type, dict->name, name, err); + myfree(err); + maps->error = DICT_ERR_CONFIG; + return (0); + } + return (vstring_str(unb64)); + } else if ((maps->error = dict->error) != 0) { + msg_warn("%s:%s lookup error for \"%s\"", + dict->type, dict->name, name); + break; + } + } + if (msg_verbose) + msg_info("%s: %s: %s: %s", myname, maps->title, name, maps->error ? + "search aborted" : "not found"); + return (0); +} + +/* maps_free - release storage */ + +MAPS *maps_free(MAPS *maps) +{ + char **map_name; + + for (map_name = maps->argv->argv; *map_name; map_name++) { + if (msg_verbose) + msg_info("maps_free: %s", *map_name); + dict_unregister(*map_name); + } + myfree(maps->title); + argv_free(maps->argv); + myfree((void *) maps); + return (0); +} + +#ifdef TEST + +#include <vstring.h> +#include <vstream.h> +#include <vstring_vstream.h> + +int main(int argc, char **argv) +{ + VSTRING *buf = vstring_alloc(100); + MAPS *maps; + const char *result; + + if (argc != 2) + msg_fatal("usage: %s maps", argv[0]); + msg_verbose = 2; + maps = maps_create("whatever", argv[1], DICT_FLAG_LOCK); + + while (vstring_fgets_nonl(buf, VSTREAM_IN)) { + maps->error = 99; + vstream_printf("\"%s\": ", vstring_str(buf)); + if ((result = maps_find(maps, vstring_str(buf), 0)) != 0) { + vstream_printf("%s\n", result); + } else if (maps->error != 0) { + vstream_printf("lookup error\n"); + } else { + vstream_printf("not found\n"); + } + vstream_fflush(VSTREAM_OUT); + } + maps_free(maps); + vstring_free(buf); + return (0); +} + +#endif |