Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 304 insertions, 0 deletions

diff --git a/src/util/dict_nisplus.c b/src/util/dict_nisplus.c
new file mode 100644
index 0000000..1f5e126
--- /dev/null
+++ b/src/util/dict_nisplus.c
@@ -0,0 +1,304 @@
+/*++
+/* NAME
+/*	dict_nisplus 3
+/* SUMMARY
+/*	dictionary manager interface to NIS+ maps
+/* SYNOPSIS
+/*	#include <dict_nisplus.h>
+/*
+/*	DICT	*dict_nisplus_open(map, open_flags, dict_flags)
+/*	const char *map;
+/*	int	dummy;
+/*	int	dict_flags;
+/* DESCRIPTION
+/*	dict_nisplus_open() makes the specified NIS+ map accessible via
+/*	the generic dictionary operations described in dict_open(3).
+/*	The \fIdummy\fR argument is not used.
+/* SEE ALSO
+/*	dict(3) generic dictionary manager
+/* DIAGNOSTICS
+/*	Fatal errors:
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Geoff Gibbs
+/*	UK-HGMP-RC
+/*	Hinxton
+/*	Cambridge
+/*	CB10 1SB, UK
+/*
+/*	based on the code for dict_nis.c et al by :-
+/*
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdlib.h>
+#ifdef HAS_NISPLUS
+#include <rpcsvc/nis.h>			/* for nis_list */
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <vstring.h>
+#include <stringops.h>
+#include <dict.h>
+#include <dict_nisplus.h>
+
+#ifdef HAS_NISPLUS
+
+/* Application-specific. */
+
+typedef struct {
+    DICT    dict;			/* generic members */
+    char   *template;			/* parsed query template */
+    int     column;			/* NIS+ field number (start at 1) */
+} DICT_NISPLUS;
+
+ /*
+  * Begin quote from nis+(1):
+  * 
+  * The following text represents a  context-free  grammar  that defines  the
+  * set of legal  NIS+ names. The terminals in this grammar are the
+  * characters `.' (dot),  `['  (open  bracket), `]'  (close  bracket),  `,'
+  * (comma),  `=' (equals) and whitespace. Angle brackets (`<' and `>'),
+  * which delineate  non- terminals,  are  not  part of the grammar. The
+  * character `|' (vertical bar) is used to separate alternate productions
+  * and should be read as ``this production OR this production''.
+  * 
+  * name                ::=    . | <simple name> | <indexed name>
+  * 
+  * simple name         ::=    <string>. | <string>.<simple name>
+  * 
+  * indexed name        ::=    <search criterion>,<simple name>
+  * 
+  * search criterion    ::=    [ <attribute list> ]
+  * 
+  * attribute list      ::=    <attribute> |  <attribute>,<attribute list>
+  * 
+  * attribute           ::=    <string> = <string>
+  * 
+  * string              ::=    ISO Latin 1 character set except  the character
+  * '/'  (slash).  The initial character may not be a terminal character or
+  * the characters '@' (at), '+' (plus), or (`-') hyphen.
+  * 
+  * Terminals that appear in strings must be  quoted   with  `"' (double quote).
+  * The `"' character may be quoted by quoting it with itself `""'.
+  * 
+  * End quote fron nis+(1).
+  * 
+  * This NIS client always quotes the entire query string (the value part of
+  * [attribute=value],file.domain.) so the issue with initial characters
+  * should not be applicable. One wonders what restrictions are applicable
+  * when a string is quoted, but the manual doesn't specify what can appear
+  * between quotes, and we don't want to get burned.
+  */
+
+ /*
+  * SLMs.
+  */
+#define STR(x) vstring_str(x)
+
+/* dict_nisplus_lookup - find table entry */
+
+static const char *dict_nisplus_lookup(DICT *dict, const char *key)
+{
+    const char *myname = "dict_nisplus_lookup";
+    DICT_NISPLUS *dict_nisplus = (DICT_NISPLUS *) dict;
+    static VSTRING *quoted_key;
+    static VSTRING *query;
+    static VSTRING *retval;
+    nis_result *reply;
+    int     count;
+    const char *cp;
+    int     last_col;
+    int     ch;
+
+    dict->error = 0;
+
+    /*
+     * Initialize.
+     */
+    if (quoted_key == 0) {
+	query = vstring_alloc(100);
+	retval = vstring_alloc(100);
+	quoted_key = vstring_alloc(100);
+    }
+
+    /*
+     * Optionally fold the key.
+     */
+    if (dict->flags & DICT_FLAG_FOLD_FIX) {
+	if (dict->fold_buf == 0)
+	    dict->fold_buf = vstring_alloc(10);
+	vstring_strcpy(dict->fold_buf, key);
+	key = lowercase(vstring_str(dict->fold_buf));
+    }
+
+    /*
+     * Check that the lookup key does not contain characters disallowed by
+     * nis+(1).
+     * 
+     * XXX Many client implementations don't seem to care about disallowed
+     * characters.
+     */
+    VSTRING_RESET(quoted_key);
+    VSTRING_ADDCH(quoted_key, '"');
+    for (cp = key; (ch = *(unsigned const char *) cp) != 0; cp++) {
+	if ((ISASCII(ch) && !ISPRINT(ch)) || (ch > 126 && ch < 160)) {
+	    msg_warn("map %s:%s: lookup key with non-printing character 0x%x:"
+		     " ignoring this request",
+		     dict->type, dict->name, ch);
+	    return (0);
+	} else if (ch == '"') {
+	    VSTRING_ADDCH(quoted_key, '"');
+	}
+	VSTRING_ADDCH(quoted_key, ch);
+    }
+    VSTRING_ADDCH(quoted_key, '"');
+    VSTRING_TERMINATE(quoted_key);
+
+    /*
+     * Plug the key into the query template, which typically looks something
+     * like the following: [alias=%s],mail_aliases.org_dir.my.nisplus.domain.
+     * 
+     * XXX The nis+ documentation defines a length limit for simple names like
+     * a.b.c., but defines no length limit for (the components of) indexed
+     * names such as [x=y],a.b.c. Our query length is limited because Postfix
+     * addresses (in envelopes or in headers) have a finite length.
+     */
+    vstring_sprintf(query, dict_nisplus->template, STR(quoted_key));
+    reply = nis_list(STR(query), FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
+
+    /*
+     * When lookup succeeds, the result may be ambiguous, or the requested
+     * column may not exist.
+     */
+    if (reply->status == NIS_SUCCESS) {
+	if ((count = NIS_RES_NUMOBJ(reply)) != 1) {
+	    msg_warn("ambiguous match (%d results) for %s in NIS+ map %s:"
+		     " ignoring this request",
+		     count, key, dict_nisplus->dict.name);
+	    nis_freeresult(reply);
+	    return (0);
+	} else {
+	    last_col = NIS_RES_OBJECT(reply)->zo_data
+		.objdata_u.en_data.en_cols.en_cols_len - 1;
+	    if (dict_nisplus->column > last_col)
+		msg_fatal("requested column %d > max column %d in table %s",
+			  dict_nisplus->column, last_col,
+			  dict_nisplus->dict.name);
+	    vstring_strcpy(retval,
+			   NIS_RES_OBJECT(reply)->zo_data.objdata_u
+			   .en_data.en_cols.en_cols_val[dict_nisplus->column]
+			   .ec_value.ec_value_val);
+	    if (msg_verbose)
+		msg_info("%s: %s, column %d -> %s", myname, STR(query),
+			 dict_nisplus->column, STR(retval));
+	    nis_freeresult(reply);
+	    return (STR(retval));
+	}
+    }
+
+    /*
+     * When the NIS+ lookup fails for reasons other than "key not found",
+     * keep logging warnings, and hope that someone will eventually notice
+     * the problem and fix it.
+     */
+    else {
+	if (reply->status != NIS_NOTFOUND
+	    && reply->status != NIS_PARTIAL) {
+	    msg_warn("lookup %s, NIS+ map %s: %s",
+		     key, dict_nisplus->dict.name,
+		     nis_sperrno(reply->status));
+	    dict->error = DICT_ERR_RETRY;
+	} else {
+	    if (msg_verbose)
+		msg_info("%s: not found: query %s", myname, STR(query));
+	}
+	nis_freeresult(reply);
+	return (0);
+    }
+}
+
+/* dict_nisplus_close - close NISPLUS map */
+
+static void dict_nisplus_close(DICT *dict)
+{
+    DICT_NISPLUS *dict_nisplus = (DICT_NISPLUS *) dict;
+
+    myfree(dict_nisplus->template);
+    if (dict->fold_buf)
+	vstring_free(dict->fold_buf);
+    dict_free(dict);
+}
+
+/* dict_nisplus_open - open NISPLUS map */
+
+DICT   *dict_nisplus_open(const char *map, int open_flags, int dict_flags)
+{
+    const char *myname = "dict_nisplus_open";
+    DICT_NISPLUS *dict_nisplus;
+    char   *col_field;
+
+    /*
+     * Sanity check.
+     */
+    if (open_flags != O_RDONLY)
+	return (dict_surrogate(DICT_TYPE_NISPLUS, map, open_flags, dict_flags,
+			       "%s:%s map requires O_RDONLY access mode",
+			       DICT_TYPE_NISPLUS, map));
+
+    /*
+     * Initialize. This is a read-only map with fixed strings, not with
+     * regular expressions.
+     */
+    dict_nisplus = (DICT_NISPLUS *)
+	dict_alloc(DICT_TYPE_NISPLUS, map, sizeof(*dict_nisplus));
+    dict_nisplus->dict.lookup = dict_nisplus_lookup;
+    dict_nisplus->dict.close = dict_nisplus_close;
+    dict_nisplus->dict.flags = dict_flags | DICT_FLAG_FIXED;
+    if (dict_flags & DICT_FLAG_FOLD_FIX)
+	dict_nisplus->dict.fold_buf = vstring_alloc(10);
+    dict_nisplus->dict.owner.status = DICT_OWNER_TRUSTED;
+
+    /*
+     * Convert the query template into an indexed name and column number. The
+     * query template looks like:
+     * 
+     * [attribute=%s;attribute=value...];simple.name.:column
+     * 
+     * One instance of %s gets to be replaced by a version of the lookup key;
+     * other attributes must specify fixed values. The reason for using ';'
+     * is that the comma character is special in main.cf. When no column
+     * number is given at the end of the map name, we use a default column.
+     */
+    dict_nisplus->template = mystrdup(map);
+    translit(dict_nisplus->template, ";", ",");
+    if ((col_field = strstr(dict_nisplus->template, ".:")) != 0) {
+	col_field[1] = 0;
+	col_field += 2;
+	if (!alldig(col_field) || (dict_nisplus->column = atoi(col_field)) < 1)
+	    msg_fatal("bad column field in NIS+ map name: %s", map);
+    } else {
+	dict_nisplus->column = 1;
+    }
+    if (msg_verbose)
+	msg_info("%s: opened NIS+ table %s for column %d",
+		 myname, dict_nisplus->template, dict_nisplus->column);
+    return (DICT_DEBUG (&dict_nisplus->dict));
+}
+
+#endif