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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 01:46:30 +0000
commitb5896ba9f6047e7031e2bdee0622d543e11a6734 (patch)
treefd7b460593a2fee1be579bec5697e6d887ea3421 /src/global/maps.c
parentInitial commit. (diff)
downloadpostfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.tar.xz
postfix-b5896ba9f6047e7031e2bdee0622d543e11a6734.zip
Adding upstream version 3.4.23.upstream/3.4.23upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/global/maps.c')
-rw-r--r--src/global/maps.c337
1 files changed, 337 insertions, 0 deletions
diff --git a/src/global/maps.c b/src/global/maps.c
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+/*++
+/* 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