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/*++
/* NAME
/* file 3
/* SUMMARY
/* mail delivery to arbitrary file
/* SYNOPSIS
/* #include "local.h"
/*
/* int deliver_file(state, usr_attr, path)
/* LOCAL_STATE state;
/* USER_ATTR usr_attr;
/* char *path;
/* DESCRIPTION
/* deliver_file() appends a message to a file, UNIX mailbox format,
/* or qmail maildir format,
/* with duplicate suppression. It will deliver only to non-executable
/* regular files.
/*
/* Arguments:
/* .IP state
/* The attributes that specify the message, recipient and more.
/* Attributes describing alias, include or forward expansion.
/* A table with the results from expanding aliases or lists.
/* .IP usr_attr
/* Attributes describing user rights and environment information.
/* .IP path
/* The file to deliver to. If the name ends in '/', delivery is done
/* in qmail maildir format, otherwise delivery is done in UNIX mailbox
/* format.
/* DIAGNOSTICS
/* deliver_file() returns non-zero when delivery should be tried again.
/* SEE ALSO
/* defer(3)
/* 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 <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
/* Utility library. */
#include <msg.h>
#include <htable.h>
#include <vstring.h>
#include <vstream.h>
#include <deliver_flock.h>
#include <set_eugid.h>
/* Global library. */
#include <mail_copy.h>
#include <bounce.h>
#include <defer.h>
#include <sent.h>
#include <been_here.h>
#include <mail_params.h>
#include <mbox_conf.h>
#include <mbox_open.h>
#include <dsn_util.h>
/* Application-specific. */
#include "local.h"
/* deliver_file - deliver to file */
int deliver_file(LOCAL_STATE state, USER_ATTR usr_attr, char *path)
{
const char *myname = "deliver_file";
struct stat st;
MBOX *mp;
DSN_BUF *why = state.msg_attr.why;
int mail_copy_status = MAIL_COPY_STAT_WRITE;
int deliver_status;
int copy_flags;
/*
* Make verbose logging easier to understand.
*/
state.level++;
if (msg_verbose)
MSG_LOG_STATE(myname, state);
/*
* DUPLICATE ELIMINATION
*
* Skip this file if it was already delivered to as this user.
*/
if (been_here(state.dup_filter, "file %ld %s", (long) usr_attr.uid, path))
return (0);
/*
* DELIVERY POLICY
*
* Do we allow delivery to files?
*/
if ((local_file_deliver_mask & state.msg_attr.exp_type) == 0) {
dsb_simple(why, "5.7.1", "mail to file is restricted");
/* Account for possible owner- sender address override. */
return (bounce_workaround(state));
}
/*
* Don't deliver trace-only requests.
*/
if (DEL_REQ_TRACE_ONLY(state.request->flags)) {
dsb_simple(why, "2.0.0", "delivers to file: %s", path);
return (sent(BOUNCE_FLAGS(state.request),
SENT_ATTR(state.msg_attr)));
}
/*
* DELIVERY RIGHTS
*
* Use a default uid/gid when none are given.
*/
if (usr_attr.uid == 0 && (usr_attr.uid = var_default_uid) == 0)
msg_panic("privileged default user id");
if (usr_attr.gid == 0 && (usr_attr.gid = var_default_gid) == 0)
msg_panic("privileged default group id");
/*
* If the name ends in /, use maildir-style delivery instead.
*/
if (path[strlen(path) - 1] == '/')
return (deliver_maildir(state, usr_attr, path));
/*
* Deliver. From here on, no early returns or we have a memory leak.
*/
if (msg_verbose)
msg_info("deliver_file (%ld,%ld): %s",
(long) usr_attr.uid, (long) usr_attr.gid, path);
if (vstream_fseek(state.msg_attr.fp, state.msg_attr.offset, SEEK_SET) < 0)
msg_fatal("seek queue file %s: %m", state.msg_attr.queue_id);
/*
* As the specified user, open or create the file, lock it, and append
* the message.
*/
copy_flags = MAIL_COPY_MBOX;
if ((local_deliver_hdr_mask & DELIVER_HDR_FILE) == 0)
copy_flags &= ~MAIL_COPY_DELIVERED;
set_eugid(usr_attr.uid, usr_attr.gid);
mp = mbox_open(path, O_APPEND | O_CREAT | O_WRONLY,
S_IRUSR | S_IWUSR, &st, -1, -1,
local_mbox_lock_mask | MBOX_DOT_LOCK_MAY_FAIL,
"5.2.0", why);
if (mp != 0) {
if (S_ISREG(st.st_mode) && st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) {
vstream_fclose(mp->fp);
dsb_simple(why, "5.7.1", "file is executable");
} else {
mail_copy_status = mail_copy(COPY_ATTR(state.msg_attr), mp->fp,
S_ISREG(st.st_mode) ? copy_flags :
(copy_flags & ~MAIL_COPY_TOFILE),
"\n", why);
}
mbox_release(mp);
}
set_eugid(var_owner_uid, var_owner_gid);
/*
* As the mail system, bounce, defer delivery, or report success.
*/
if (mail_copy_status & MAIL_COPY_STAT_CORRUPT) {
deliver_status = DEL_STAT_DEFER;
} else if (mail_copy_status != 0) {
vstring_sprintf_prepend(why->reason,
"cannot append message to file %s: ", path);
/* Account for possible owner- sender address override. */
deliver_status = bounce_workaround(state);
} else {
dsb_simple(why, "2.0.0", "delivered to file: %s", path);
deliver_status = sent(BOUNCE_FLAGS(state.request),
SENT_ATTR(state.msg_attr));
}
return (deliver_status);
}
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