1 files changed, 316 insertions, 0 deletions

diff --git a/src/global/bounce_log.c b/src/global/bounce_log.c
new file mode 100644
index 0000000..198f240
--- /dev/null
+++ b/src/global/bounce_log.c
@@ -0,0 +1,316 @@
+/*++
+/* 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);
+}