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/*++
/* NAME
/* maildir 3
/* SUMMARY
/* delivery to maildir
/* SYNOPSIS
/* #include "virtual.h"
/*
/* int deliver_maildir(state, usr_attr)
/* LOCAL_STATE state;
/* USER_ATTR usr_attr;
/* DESCRIPTION
/* deliver_maildir() delivers a message to a qmail-style maildir.
/*
/* Arguments:
/* .IP state
/* The attributes that specify the message, recipient and more.
/* .IP usr_attr
/* Attributes describing user rights and environment information.
/* DIAGNOSTICS
/* deliver_maildir() always succeeds or it bounces the message.
/* SEE ALSO
/* bounce(3)
/* 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 <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <time.h>
#include <errno.h>
/* Utility library. */
#include <msg.h>
#include <mymalloc.h>
#include <stringops.h>
#include <vstream.h>
#include <vstring.h>
#include <make_dirs.h>
#include <set_eugid.h>
#include <get_hostname.h>
#include <sane_fsops.h>
#include <warn_stat.h>
/* Global library. */
#include <mail_copy.h>
#include <bounce.h>
#include <defer.h>
#include <sent.h>
#include <mail_params.h>
#include <mbox_open.h>
#include <dsn_util.h>
/* Application-specific. */
#include "virtual.h"
/* deliver_maildir - delivery to maildir-style mailbox */
int deliver_maildir(LOCAL_STATE state, USER_ATTR usr_attr)
{
const char *myname = "deliver_maildir";
char *newdir;
char *tmpdir;
char *curdir;
char *tmpfile;
char *newfile;
DSN_BUF *why = state.msg_attr.why;
VSTRING *buf;
VSTREAM *dst;
int mail_copy_status;
int deliver_status;
int copy_flags;
struct stat st;
struct timeval starttime;
GETTIMEOFDAY(&starttime);
/*
* Make verbose logging easier to understand.
*/
state.level++;
if (msg_verbose)
MSG_LOG_STATE(myname, state);
/*
* Don't deliver trace-only requests.
*/
if (DEL_REQ_TRACE_ONLY(state.request->flags)) {
dsb_simple(why, "2.0.0", "delivers to maildir");
return (sent(BOUNCE_FLAGS(state.request),
SENT_ATTR(state.msg_attr)));
}
/*
* Initialize. Assume the operation will fail. Set the delivered
* attribute to reflect the final recipient.
*/
if (vstream_fseek(state.msg_attr.fp, state.msg_attr.offset, SEEK_SET) < 0)
msg_fatal("seek message file %s: %m", VSTREAM_PATH(state.msg_attr.fp));
state.msg_attr.delivered = state.msg_attr.rcpt.address;
mail_copy_status = MAIL_COPY_STAT_WRITE;
buf = vstring_alloc(100);
copy_flags = MAIL_COPY_TOFILE | MAIL_COPY_RETURN_PATH
| MAIL_COPY_DELIVERED | MAIL_COPY_ORIG_RCPT;
newdir = concatenate(usr_attr.mailbox, "new/", (char *) 0);
tmpdir = concatenate(usr_attr.mailbox, "tmp/", (char *) 0);
curdir = concatenate(usr_attr.mailbox, "cur/", (char *) 0);
/*
* Create and write the file as the recipient, so that file quota work.
* Create any missing directories on the fly. The file name is chosen
* according to ftp://koobera.math.uic.edu/www/proto/maildir.html:
*
* "A unique name has three pieces, separated by dots. On the left is the
* result of time(). On the right is the result of gethostname(). In the
* middle is something that doesn't repeat within one second on a single
* host. I fork a new process for each delivery, so I just use the
* process ID. If you're delivering several messages from one process,
* use starttime.pid_count.host, where starttime is the time that your
* process started, and count is the number of messages you've
* delivered."
*
* Well, that stopped working on fast machines, and on operating systems
* that randomize process ID values. When creating a file in tmp/ we use
* the process ID because it still is an exclusive resource. When moving
* the file to new/ we use the device number and inode number. I do not
* care if this breaks on a remote AFS file system, because people should
* know better.
*
* On January 26, 2003, http://cr.yp.to/proto/maildir.html said:
*
* A unique name has three pieces, separated by dots. On the left is the
* result of time() or the second counter from gettimeofday(). On the
* right is the result of gethostname(). (To deal with invalid host
* names, replace / with \057 and : with \072.) In the middle is a
* delivery identifier, discussed below.
*
* [...]
*
* Modern delivery identifiers are created by concatenating enough of the
* following strings to guarantee uniqueness:
*
* [...]
*
* In, where n is (in hexadecimal) the UNIX inode number of this file.
* Unfortunately, inode numbers aren't always available through NFS.
*
* Vn, where n is (in hexadecimal) the UNIX device number of this file.
* Unfortunately, device numbers aren't always available through NFS.
* (Device numbers are also not helpful with the standard UNIX
* filesystem: a maildir has to be within a single UNIX device for link()
* and rename() to work.)
*
* Mn, where n is (in decimal) the microsecond counter from the same
* gettimeofday() used for the left part of the unique name.
*
* Pn, where n is (in decimal) the process ID.
*
* [...]
*/
set_eugid(usr_attr.uid, usr_attr.gid);
vstring_sprintf(buf, "%lu.P%d.%s",
(unsigned long) starttime.tv_sec, var_pid, get_hostname());
tmpfile = concatenate(tmpdir, STR(buf), (char *) 0);
newfile = 0;
if ((dst = vstream_fopen(tmpfile, O_WRONLY | O_CREAT | O_EXCL, 0600)) == 0
&& (errno != ENOENT
|| make_dirs(tmpdir, 0700) < 0
|| (dst = vstream_fopen(tmpfile, O_WRONLY | O_CREAT | O_EXCL, 0600)) == 0)) {
dsb_simple(why, mbox_dsn(errno, "4.2.0"),
"create maildir file %s: %m", tmpfile);
} else if (fstat(vstream_fileno(dst), &st) < 0) {
/*
* Coverity 200604: file descriptor leak in code that never executes.
* Code replaced by msg_fatal(), as it is not worthwhile to continue
* after an impossible error condition.
*/
msg_fatal("fstat %s: %m", tmpfile);
} else {
vstring_sprintf(buf, "%lu.V%lxI%lxM%lu.%s",
(unsigned long) starttime.tv_sec,
(unsigned long) st.st_dev,
(unsigned long) st.st_ino,
(unsigned long) starttime.tv_usec,
get_hostname());
newfile = concatenate(newdir, STR(buf), (char *) 0);
if ((mail_copy_status = mail_copy(COPY_ATTR(state.msg_attr),
dst, copy_flags, "\n",
why)) == 0) {
if (sane_link(tmpfile, newfile) < 0
&& (errno != ENOENT
|| (make_dirs(curdir, 0700), make_dirs(newdir, 0700)) < 0
|| sane_link(tmpfile, newfile) < 0)) {
dsb_simple(why, mbox_dsn(errno, "4.2.0"),
"create maildir file %s: %m", newfile);
mail_copy_status = MAIL_COPY_STAT_WRITE;
}
}
if (unlink(tmpfile) < 0)
msg_warn("remove %s: %m", tmpfile);
}
set_eugid(var_owner_uid, var_owner_gid);
/*
* The maildir location is controlled by the mail administrator. If
* delivery fails, try again later. We would just bounce when the maildir
* location possibly under user control.
*/
if (mail_copy_status & MAIL_COPY_STAT_CORRUPT) {
deliver_status = DEL_STAT_DEFER;
} else if (mail_copy_status != 0) {
if (errno == EACCES) {
msg_warn("maildir access problem for UID/GID=%lu/%lu: %s",
(long) usr_attr.uid, (long) usr_attr.gid,
STR(why->reason));
msg_warn("perhaps you need to create the maildirs in advance");
}
vstring_sprintf_prepend(why->reason, "maildir delivery failed: ");
deliver_status =
(STR(why->status)[0] == '4' ?
defer_append : bounce_append)
(BOUNCE_FLAGS(state.request),
BOUNCE_ATTR(state.msg_attr));
} else {
dsb_simple(why, "2.0.0", "delivered to maildir");
deliver_status = sent(BOUNCE_FLAGS(state.request),
SENT_ATTR(state.msg_attr));
}
vstring_free(buf);
myfree(newdir);
myfree(tmpdir);
myfree(curdir);
myfree(tmpfile);
if (newfile)
myfree(newfile);
return (deliver_status);
}
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