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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 19:59:03 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 19:59:03 +0000 |
commit | a848231ae0f346dc7cc000973fbeb65b0894ee92 (patch) | |
tree | 44b60b367c86723cc78383ef247885d72b388afe /src/util/mkmap_sdbm.c | |
parent | Initial commit. (diff) | |
download | postfix-a848231ae0f346dc7cc000973fbeb65b0894ee92.tar.xz postfix-a848231ae0f346dc7cc000973fbeb65b0894ee92.zip |
Adding upstream version 3.8.5.upstream/3.8.5
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/util/mkmap_sdbm.c')
-rw-r--r-- | src/util/mkmap_sdbm.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/src/util/mkmap_sdbm.c b/src/util/mkmap_sdbm.c new file mode 100644 index 0000000..54608f1 --- /dev/null +++ b/src/util/mkmap_sdbm.c @@ -0,0 +1,113 @@ +/*++ +/* NAME +/* mkmap_sdbm 3 +/* SUMMARY +/* create or open database, SDBM style +/* SYNOPSIS +/* #include <dict_sdbm.h> +/* +/* MKMAP *mkmap_sdbm_open(path) +/* const char *path; +/* DESCRIPTION +/* This module implements support for creating SDBM databases. +/* +/* mkmap_sdbm_open() takes a file name, appends the ".dir" and ".pag" +/* suffixes, and creates or opens the named SDBM database. +/* This routine is a SDBM-specific helper for the more general +/* mkmap_open() routine. +/* +/* All errors are fatal. +/* SEE ALSO +/* dict_sdbm(3), SDBM 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 +/* +/* Wietse Venema +/* Google, Inc. +/* 111 8th Avenue +/* New York, NY 10011, USA +/*--*/ + +/* System library. */ + +#include <sys_defs.h> +#include <unistd.h> + +/* Utility library. */ + +#include <msg.h> +#include <mymalloc.h> +#include <stringops.h> +#include <dict_sdbm.h> +#include <myflock.h> + +#ifdef HAS_SDBM + +#include <sdbm.h> + +typedef struct MKMAP_SDBM { + MKMAP mkmap; /* parent class */ + char *lock_file; /* path name */ + int lock_fd; /* -1 or open locked file */ +} MKMAP_SDBM; + +/* mkmap_sdbm_after_close - clean up after closing database */ + +static void mkmap_sdbm_after_close(MKMAP *mp) +{ + MKMAP_SDBM *mkmap = (MKMAP_SDBM *) mp; + + if (mkmap->lock_fd >= 0 && close(mkmap->lock_fd) < 0) + msg_warn("close %s: %m", mkmap->lock_file); + myfree(mkmap->lock_file); +} + +/* mkmap_sdbm_open - create or open database */ + +MKMAP *mkmap_sdbm_open(const char *path) +{ + MKMAP_SDBM *mkmap = (MKMAP_SDBM *) 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_sdbm_open; + mkmap->mkmap.after_open = 0; + mkmap->mkmap.after_close = mkmap_sdbm_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 |