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/*++
/* NAME
/* bounce_log 3
/* SUMMARY
/* bounce file API
/* SYNOPSIS
/* #include <bounce_log.h>
/*
/* typedef struct {
/* .in +4
/* /* No public members. */
/* .in -4
/* } BOUNCE_LOG;
/*
/* BOUNCE_LOG *bounce_log_open(queue, id, flags, mode)
/* const char *queue;
/* const char *id;
/* int flags;
/* mode_t mode;
/*
/* BOUNCE_LOG *bounce_log_read(bp, rcpt, dsn)
/* BOUNCE_LOG *bp;
/* RCPT_BUF *rcpt;
/* DSN_BUF *dsn;
/*
/* void bounce_log_rewind(bp)
/* BOUNCE_LOG *bp;
/*
/* void bounce_log_close(bp)
/* BOUNCE_LOG *bp;
/* DESCRIPTION
/* This module implements a bounce/defer logfile API. Information
/* is sanitized for control and non-ASCII characters. Fields not
/* present in input are represented by empty strings.
/*
/* bounce_log_open() opens the named bounce or defer logfile
/* and returns a handle that must be used for further access.
/* The result is a null pointer if the file cannot be opened.
/* The caller is expected to inspect the errno code and deal
/* with the problem.
/*
/* bounce_log_read() reads the next record from the bounce or defer
/* logfile (skipping over and warning about malformed data)
/* and breaks out the recipient address, the recipient status
/* and the text that explains why the recipient was undeliverable.
/* bounce_log_read() returns a null pointer when no recipient was read,
/* otherwise it returns its argument.
/*
/* bounce_log_rewind() is a helper that seeks to the first recipient
/* in an open bounce or defer logfile (skipping over recipients that
/* are marked as done). The result is 0 in case of success, -1 in case
/* of problems.
/*
/* bounce_log_close() closes an open bounce or defer logfile and
/* releases memory for the specified handle. The result is non-zero
/* in case of I/O errors.
/*
/* Arguments:
/* .IP queue
/* The bounce or defer queue name.
/* .IP id
/* The message queue id of bounce or defer logfile. This
/* file has the same name as the original message file.
/* .IP flags
/* File open flags, as with open(2).
/* .IP mode
/* File permissions, as with open(2).
/* .IP rcpt
/* Recipient buffer. The RECIPIENT member is updated.
/* .IP dsn
/* Delivery status information. The DSN member is updated.
/* 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 <string.h>
#include <ctype.h>
#include <unistd.h>
#include <stdlib.h>
/* Utility library. */
#include <msg.h>
#include <mymalloc.h>
#include <vstream.h>
#include <vstring.h>
#include <vstring_vstream.h>
#include <stringops.h>
/* Global library. */
#include <mail_params.h>
#include <mail_proto.h>
#include <mail_queue.h>
#include <dsn_mask.h>
#include <bounce_log.h>
/* Application-specific. */
#define STR(x) vstring_str(x)
/* bounce_log_open - open bounce read stream */
BOUNCE_LOG *bounce_log_open(const char *queue_name, const char *queue_id,
int flags, mode_t mode)
{
BOUNCE_LOG *bp;
VSTREAM *fp;
#define STREQ(x,y) (strcmp((x),(y)) == 0)
/*
* Logfiles may contain a mixture of old-style (<recipient>: text) and
* new-style entries with multiple attributes per recipient.
*
* Kluge up default DSN status and action for old-style logfiles.
*/
if ((fp = mail_queue_open(queue_name, queue_id, flags, mode)) == 0) {
return (0);
} else {
bp = (BOUNCE_LOG *) mymalloc(sizeof(*bp));
bp->fp = fp;
bp->buf = vstring_alloc(100);
if (STREQ(queue_name, MAIL_QUEUE_DEFER)) {
bp->compat_status = mystrdup("4.0.0");
bp->compat_action = mystrdup("delayed");
} else {
bp->compat_status = mystrdup("5.0.0");
bp->compat_action = mystrdup("failed");
}
return (bp);
}
}
/* bounce_log_read - read one record from bounce log file */
BOUNCE_LOG *bounce_log_read(BOUNCE_LOG *bp, RCPT_BUF *rcpt_buf,
DSN_BUF *dsn_buf)
{
char *recipient;
char *text;
char *cp;
int state;
/*
* Our trivial logfile parser state machine.
*/
#define START 0 /* still searching */
#define FOUND 1 /* in logfile entry */
/*
* Initialize.
*/
state = START;
rcpb_reset(rcpt_buf);
dsb_reset(dsn_buf);
/*
* Support mixed logfile formats to make migration easier. The same file
* can start with old-style records and end with new-style records. With
* backwards compatibility, we even have old format followed by new
* format within the same logfile entry!
*/
for (;;) {
if ((vstring_get_nonl(bp->buf, bp->fp) == VSTREAM_EOF))
return (0);
/*
* Logfile entries are separated by blank lines. Even the old ad-hoc
* logfile format has a blank line after the last record. This means
* we can safely use blank lines to detect the start and end of
* logfile entries.
*/
if (STR(bp->buf)[0] == 0) {
if (state == FOUND)
break;
state = START;
continue;
}
/*
* Sanitize. XXX This needs to be done more carefully with new-style
* logfile entries.
*/
cp = printable(STR(bp->buf), '?');
if (state == START)
state = FOUND;
/*
* New style logfile entries are in "name = value" format.
*/
if (ISALNUM(*cp)) {
const char *err;
char *name;
char *value;
long offset;
int notify;
/*
* Split into name and value.
*/
if ((err = split_nameval(cp, &name, &value)) != 0) {
msg_warn("%s: malformed record: %s", VSTREAM_PATH(bp->fp), err);
continue;
}
/*
* Save attribute value.
*/
if (STREQ(name, MAIL_ATTR_RECIP)) {
vstring_strcpy(rcpt_buf->address, *value ?
value : "(MAILER-DAEMON)");
} else if (STREQ(name, MAIL_ATTR_ORCPT)) {
vstring_strcpy(rcpt_buf->orig_addr, *value ?
value : "(MAILER-DAEMON)");
} else if (STREQ(name, MAIL_ATTR_DSN_ORCPT)) {
vstring_strcpy(rcpt_buf->dsn_orcpt, value);
} else if (STREQ(name, MAIL_ATTR_DSN_NOTIFY)) {
if ((notify = atoi(value)) > 0 && DSN_NOTIFY_OK(notify))
rcpt_buf->dsn_notify = notify;
} else if (STREQ(name, MAIL_ATTR_OFFSET)) {
if ((offset = atol(value)) > 0)
rcpt_buf->offset = offset;
} else if (STREQ(name, MAIL_ATTR_DSN_STATUS)) {
vstring_strcpy(dsn_buf->status, value);
} else if (STREQ(name, MAIL_ATTR_DSN_ACTION)) {
vstring_strcpy(dsn_buf->action, value);
} else if (STREQ(name, MAIL_ATTR_DSN_DTYPE)) {
vstring_strcpy(dsn_buf->dtype, value);
} else if (STREQ(name, MAIL_ATTR_DSN_DTEXT)) {
vstring_strcpy(dsn_buf->dtext, value);
} else if (STREQ(name, MAIL_ATTR_DSN_MTYPE)) {
vstring_strcpy(dsn_buf->mtype, value);
} else if (STREQ(name, MAIL_ATTR_DSN_MNAME)) {
vstring_strcpy(dsn_buf->mname, value);
} else if (STREQ(name, MAIL_ATTR_WHY)) {
vstring_strcpy(dsn_buf->reason, value);
} else {
msg_warn("%s: unknown attribute name: %s, ignored",
VSTREAM_PATH(bp->fp), name);
}
continue;
}
/*
* Old-style logfile record. Find the recipient address.
*/
if (*cp != '<') {
msg_warn("%s: malformed record: %.30s...",
VSTREAM_PATH(bp->fp), cp);
continue;
}
recipient = cp + 1;
if ((cp = strstr(recipient, ">: ")) == 0) {
msg_warn("%s: malformed record: %.30s...",
VSTREAM_PATH(bp->fp), recipient - 1);
continue;
}
*cp = 0;
vstring_strcpy(rcpt_buf->address, *recipient ?
recipient : "(MAILER-DAEMON)");
/*
* Find the text that explains why mail was not deliverable.
*/
text = cp + 2;
while (*text && ISSPACE(*text))
text++;
vstring_strcpy(dsn_buf->reason, text);
}
/*
* Specify place holders for missing fields. See also DSN_FROM_DSN_BUF()
* and RECIPIENT_FROM_RCPT_BUF() for null and non-null fields.
*/
#define BUF_NODATA(buf) (STR(buf)[0] == 0)
#define BUF_ASSIGN(buf, text) vstring_strcpy((buf), (text))
if (BUF_NODATA(rcpt_buf->address))
BUF_ASSIGN(rcpt_buf->address, "(recipient address unavailable)");
if (BUF_NODATA(dsn_buf->status))
BUF_ASSIGN(dsn_buf->status, bp->compat_status);
if (BUF_NODATA(dsn_buf->action))
BUF_ASSIGN(dsn_buf->action, bp->compat_action);
if (BUF_NODATA(dsn_buf->reason))
BUF_ASSIGN(dsn_buf->reason, "(description unavailable)");
(void) RECIPIENT_FROM_RCPT_BUF(rcpt_buf);
(void) DSN_FROM_DSN_BUF(dsn_buf);
return (bp);
}
/* bounce_log_close - close bounce reader stream */
int bounce_log_close(BOUNCE_LOG *bp)
{
int ret;
ret = vstream_fclose(bp->fp);
vstring_free(bp->buf);
myfree(bp->compat_status);
myfree(bp->compat_action);
myfree((void *) bp);
return (ret);
}
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