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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/mkmap_dbm.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/mkmap_dbm.c')
-rw-r--r--src/global/mkmap_dbm.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/src/global/mkmap_dbm.c b/src/global/mkmap_dbm.c
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+/*++
+/* NAME
+/* mkmap_dbm 3
+/* SUMMARY
+/* create or open database, DBM style
+/* SYNOPSIS
+/* #include <mkmap.h>
+/*
+/* MKMAP *mkmap_dbm_open(path)
+/* const char *path;
+/* DESCRIPTION
+/* This module implements support for creating DBM databases.
+/*
+/* mkmap_dbm_open() takes a file name, appends the ".dir" and ".pag"
+/* suffixes, and creates or opens the named DBM database.
+/* This routine is a DBM-specific helper for the more general
+/* mkmap_open() routine.
+/*
+/* All errors are fatal.
+/* SEE ALSO
+/* dict_dbm(3), DBM dictionary interface.
+/* 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 <unistd.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <stringops.h>
+#include <dict.h>
+#include <dict_dbm.h>
+#include <myflock.h>
+
+/* Application-specific. */
+
+#include "mkmap.h"
+
+#ifdef HAS_DBM
+#ifdef PATH_NDBM_H
+#include PATH_NDBM_H
+#else
+#include <ndbm.h>
+#endif
+
+typedef struct MKMAP_DBM {
+ MKMAP mkmap; /* parent class */
+ char *lock_file; /* path name */
+ int lock_fd; /* -1 or open locked file */
+} MKMAP_DBM;
+
+/* mkmap_dbm_after_close - clean up after closing database */
+
+static void mkmap_dbm_after_close(MKMAP *mp)
+{
+ MKMAP_DBM *mkmap = (MKMAP_DBM *) mp;
+
+ if (mkmap->lock_fd >= 0 && close(mkmap->lock_fd) < 0)
+ msg_warn("close %s: %m", mkmap->lock_file);
+ myfree(mkmap->lock_file);
+}
+
+/* mkmap_dbm_open - create or open database */
+
+MKMAP *mkmap_dbm_open(const char *path)
+{
+ MKMAP_DBM *mkmap = (MKMAP_DBM *) mymalloc(sizeof(*mkmap));
+ char *pag_file;
+ int pag_fd;
+
+ /*
+ * Fill in the generic members.
+ */
+ mkmap->lock_file = concatenate(path, ".dir", (char *) 0);
+ mkmap->mkmap.open = dict_dbm_open;
+ mkmap->mkmap.after_open = 0;
+ mkmap->mkmap.after_close = mkmap_dbm_after_close;
+
+ /*
+ * Unfortunately, not all systems support locking on open(), so we open
+ * the .dir and .pag files before truncating them. Keep one file open for
+ * locking.
+ */
+ if ((mkmap->lock_fd = open(mkmap->lock_file, O_CREAT | O_RDWR, 0644)) < 0)
+ msg_fatal("open %s: %m", mkmap->lock_file);
+
+ pag_file = concatenate(path, ".pag", (char *) 0);
+ if ((pag_fd = open(pag_file, O_CREAT | O_RDWR, 0644)) < 0)
+ msg_fatal("open %s: %m", pag_file);
+ if (close(pag_fd))
+ msg_warn("close %s: %m", pag_file);
+ myfree(pag_file);
+
+ /*
+ * Get an exclusive lock - we're going to change the database so we can't
+ * have any spectators.
+ */
+ if (myflock(mkmap->lock_fd, INTERNAL_LOCK, MYFLOCK_OP_EXCLUSIVE) < 0)
+ msg_fatal("lock %s: %m", mkmap->lock_file);
+
+ return (&mkmap->mkmap);
+}
+
+#endif