Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 392 insertions, 0 deletions

diff --git a/src/local/forward.c b/src/local/forward.c
new file mode 100644
index 0000000..14367af
--- /dev/null
+++ b/src/local/forward.c
@@ -0,0 +1,392 @@
+/*++
+/* NAME
+/*	forward 3
+/* SUMMARY
+/*	message forwarding
+/* SYNOPSIS
+/*	#include "local.h"
+/*
+/*	int	forward_init()
+/*
+/*	int	forward_append(attr)
+/*	DELIVER_ATTR attr;
+/*
+/*	int	forward_finish(request, attr, cancel)
+/*	DELIVER_REQUEST *request;
+/*	DELIVER_ATTR attr;
+/*	int	cancel;
+/* DESCRIPTION
+/*	This module implements the client interface for message
+/*	forwarding.
+/*
+/*	forward_init() initializes internal data structures.
+/*
+/*	forward_append() appends a recipient to the list of recipients
+/*	that will receive a message with the specified message sender
+/*	and delivered-to addresses.
+/*
+/*	forward_finish() forwards the actual message contents and
+/*	releases the memory allocated by forward_init() and by
+/*	forward_append(). When the \fIcancel\fR argument is true, no
+/*	messages will be forwarded. The \fIattr\fR argument specifies
+/*	the original message delivery attributes as they were before
+/*	alias or forward expansions.
+/* DIAGNOSTICS
+/*	A non-zero result means that the requested operation should
+/*	be tried again.
+/*	Warnings: problems connecting to the forwarding service,
+/*	corrupt message file. A corrupt message is saved to the
+/*	"corrupt" queue for further inspection.
+/*	Fatal: out of memory.
+/*	Panic: missing forward_init() or forward_finish() call.
+/* 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 <sys/time.h>
+#include <unistd.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <htable.h>
+#include <argv.h>
+#include <vstring.h>
+#include <vstream.h>
+#include <vstring_vstream.h>
+#include <iostuff.h>
+#include <stringops.h>
+
+/* Global library. */
+
+#include <mail_proto.h>
+#include <cleanup_user.h>
+#include <sent.h>
+#include <record.h>
+#include <rec_type.h>
+#include <mark_corrupt.h>
+#include <mail_date.h>
+#include <mail_params.h>
+#include <dsn_mask.h>
+#include <smtputf8.h>
+
+/* Application-specific. */
+
+#include "local.h"
+
+ /*
+  * Use one cleanup service connection for each (delivered to, sender) pair.
+  */
+static HTABLE *forward_dt;
+
+typedef struct FORWARD_INFO {
+    VSTREAM *cleanup;			/* clean up service handle */
+    char   *queue_id;			/* forwarded message queue id */
+    struct timeval posting_time;	/* posting time */
+} FORWARD_INFO;
+
+/* forward_init - prepare for forwarding */
+
+int     forward_init(void)
+{
+
+    /*
+     * Sanity checks.
+     */
+    if (forward_dt != 0)
+	msg_panic("forward_init: missing forward_finish call");
+
+    forward_dt = htable_create(0);
+    return (0);
+}
+
+/* forward_open - open connection to cleanup service */
+
+static FORWARD_INFO *forward_open(DELIVER_REQUEST *request, const char *sender)
+{
+    VSTRING *buffer = vstring_alloc(100);
+    FORWARD_INFO *info;
+    VSTREAM *cleanup;
+
+#define FORWARD_OPEN_RETURN(res) do { \
+	vstring_free(buffer); \
+	return (res); \
+    } while (0)
+
+    /*
+     * Contact the cleanup service and save the new mail queue id. Request
+     * that the cleanup service bounces bad messages to the sender so that we
+     * can avoid the trouble of bounce management.
+     * 
+     * In case you wonder what kind of bounces, examples are "too many hops",
+     * "message too large", perhaps some others. The reason not to bounce
+     * ourselves is that we don't really know who the recipients are.
+     */
+    cleanup = mail_connect(MAIL_CLASS_PUBLIC, var_cleanup_service, BLOCKING);
+    if (cleanup == 0) {
+	msg_warn("connect to %s/%s: %m",
+		 MAIL_CLASS_PUBLIC, var_cleanup_service);
+	FORWARD_OPEN_RETURN(0);
+    }
+    close_on_exec(vstream_fileno(cleanup), CLOSE_ON_EXEC);
+    if (attr_scan(cleanup, ATTR_FLAG_STRICT,
+		  RECV_ATTR_STR(MAIL_ATTR_QUEUEID, buffer),
+		  ATTR_TYPE_END) != 1) {
+	vstream_fclose(cleanup);
+	FORWARD_OPEN_RETURN(0);
+    }
+    info = (FORWARD_INFO *) mymalloc(sizeof(FORWARD_INFO));
+    info->cleanup = cleanup;
+    info->queue_id = mystrdup(STR(buffer));
+    GETTIMEOFDAY(&info->posting_time);
+
+#define FORWARD_CLEANUP_FLAGS \
+	(CLEANUP_FLAG_BOUNCE | CLEANUP_FLAG_MASK_INTERNAL \
+	| smtputf8_autodetect(MAIL_SRC_MASK_FORWARD) \
+	| ((request->smtputf8 & SMTPUTF8_FLAG_REQUESTED) ? \
+	CLEANUP_FLAG_SMTPUTF8 : 0))
+
+    attr_print(cleanup, ATTR_FLAG_NONE,
+	       SEND_ATTR_INT(MAIL_ATTR_FLAGS, FORWARD_CLEANUP_FLAGS),
+	       ATTR_TYPE_END);
+
+    /*
+     * Send initial message envelope information. For bounces, set the
+     * designated sender: mailing list owner, posting user, whatever.
+     */
+    rec_fprintf(cleanup, REC_TYPE_TIME, REC_TYPE_TIME_FORMAT,
+		REC_TYPE_TIME_ARG(info->posting_time));
+    rec_fputs(cleanup, REC_TYPE_FROM, sender);
+
+    /*
+     * Don't send the original envelope ID or full/headers return mask if it
+     * was reset due to mailing list expansion.
+     */
+    if (request->dsn_ret)
+	rec_fprintf(cleanup, REC_TYPE_ATTR, "%s=%d",
+		    MAIL_ATTR_DSN_RET, request->dsn_ret);
+    if (request->dsn_envid && *(request->dsn_envid))
+	rec_fprintf(cleanup, REC_TYPE_ATTR, "%s=%s",
+		    MAIL_ATTR_DSN_ENVID, request->dsn_envid);
+
+    /*
+     * Zero-length attribute values are place holders for unavailable
+     * attribute values. See qmgr_message.c. They are not meant to be
+     * propagated to queue files.
+     */
+#define PASS_ATTR(fp, name, value) do { \
+    if ((value) && *(value)) \
+	rec_fprintf((fp), REC_TYPE_ATTR, "%s=%s", (name), (value)); \
+    } while (0)
+
+    /*
+     * XXX encapsulate these as one object.
+     */
+    PASS_ATTR(cleanup, MAIL_ATTR_LOG_CLIENT_NAME, request->client_name);
+    PASS_ATTR(cleanup, MAIL_ATTR_LOG_CLIENT_ADDR, request->client_addr);
+    PASS_ATTR(cleanup, MAIL_ATTR_LOG_PROTO_NAME, request->client_proto);
+    PASS_ATTR(cleanup, MAIL_ATTR_LOG_HELO_NAME, request->client_helo);
+    PASS_ATTR(cleanup, MAIL_ATTR_SASL_METHOD, request->sasl_method);
+    PASS_ATTR(cleanup, MAIL_ATTR_SASL_USERNAME, request->sasl_username);
+    PASS_ATTR(cleanup, MAIL_ATTR_SASL_SENDER, request->sasl_sender);
+    PASS_ATTR(cleanup, MAIL_ATTR_LOG_IDENT, request->log_ident);
+    PASS_ATTR(cleanup, MAIL_ATTR_RWR_CONTEXT, request->rewrite_context);
+
+    FORWARD_OPEN_RETURN(info);
+}
+
+/* forward_append - append recipient to message envelope */
+
+int     forward_append(DELIVER_ATTR attr)
+{
+    FORWARD_INFO *info;
+    HTABLE *table_snd;
+
+    /*
+     * Sanity checks.
+     */
+    if (msg_verbose)
+	msg_info("forward delivered=%s sender=%s recip=%s",
+		 attr.delivered, attr.sender, attr.rcpt.address);
+    if (forward_dt == 0)
+	msg_panic("forward_append: missing forward_init call");
+
+    /*
+     * In order to find the recipient list, first index a table by
+     * delivered-to header address, then by envelope sender address.
+     */
+    if ((table_snd = (HTABLE *) htable_find(forward_dt, attr.delivered)) == 0) {
+	table_snd = htable_create(0);
+	htable_enter(forward_dt, attr.delivered, (void *) table_snd);
+    }
+    if ((info = (FORWARD_INFO *) htable_find(table_snd, attr.sender)) == 0) {
+	if ((info = forward_open(attr.request, attr.sender)) == 0)
+	    return (-1);
+	htable_enter(table_snd, attr.sender, (void *) info);
+    }
+
+    /*
+     * Append the recipient to the message envelope. Don't send the original
+     * recipient or notification mask if it was reset due to mailing list
+     * expansion.
+     */
+    if (*attr.rcpt.dsn_orcpt)
+	rec_fprintf(info->cleanup, REC_TYPE_ATTR, "%s=%s",
+		    MAIL_ATTR_DSN_ORCPT, attr.rcpt.dsn_orcpt);
+    if (attr.rcpt.dsn_notify)
+	rec_fprintf(info->cleanup, REC_TYPE_ATTR, "%s=%d",
+		    MAIL_ATTR_DSN_NOTIFY, attr.rcpt.dsn_notify);
+    if (*attr.rcpt.orig_addr)
+	rec_fputs(info->cleanup, REC_TYPE_ORCP, attr.rcpt.orig_addr);
+    rec_fputs(info->cleanup, REC_TYPE_RCPT, attr.rcpt.address);
+
+    return (vstream_ferror(info->cleanup));
+}
+
+/* forward_send - send forwarded message */
+
+static int forward_send(FORWARD_INFO *info, DELIVER_REQUEST *request,
+			        DELIVER_ATTR attr, char *delivered)
+{
+    const char *myname = "forward_send";
+    VSTRING *buffer = vstring_alloc(100);
+    VSTRING *folded;
+    int     status;
+    int     rec_type = 0;
+
+    /*
+     * Start the message content segment. Prepend our Delivered-To: header to
+     * the message data. Stop at the first error. XXX Rely on the front-end
+     * services to enforce record size limits.
+     */
+    rec_fputs(info->cleanup, REC_TYPE_MESG, "");
+    vstring_strcpy(buffer, delivered);
+    rec_fprintf(info->cleanup, REC_TYPE_NORM, "Received: by %s (%s)",
+		var_myhostname, var_mail_name);
+    rec_fprintf(info->cleanup, REC_TYPE_NORM, "\tid %s; %s",
+		info->queue_id, mail_date(info->posting_time.tv_sec));
+    if (local_deliver_hdr_mask & DELIVER_HDR_FWD) {
+	folded = vstring_alloc(100);
+	rec_fprintf(info->cleanup, REC_TYPE_NORM, "Delivered-To: %s",
+		    casefold(folded, (STR(buffer))));
+	vstring_free(folded);
+    }
+    if ((status = vstream_ferror(info->cleanup)) == 0)
+	if (vstream_fseek(attr.fp, attr.offset, SEEK_SET) < 0)
+	    msg_fatal("%s: seek queue file %s: %m:",
+		      myname, VSTREAM_PATH(attr.fp));
+    while (status == 0 && (rec_type = rec_get(attr.fp, buffer, 0)) > 0) {
+	if (rec_type != REC_TYPE_CONT && rec_type != REC_TYPE_NORM)
+	    break;
+	status = (REC_PUT_BUF(info->cleanup, rec_type, buffer) != rec_type);
+    }
+    if (status == 0 && rec_type != REC_TYPE_XTRA) {
+	msg_warn("%s: bad record type: %d in message content",
+		 info->queue_id, rec_type);
+	status |= mark_corrupt(attr.fp);
+    }
+
+    /*
+     * Send the end-of-data marker only when there were no errors.
+     */
+    if (status == 0) {
+	rec_fputs(info->cleanup, REC_TYPE_XTRA, "");
+	rec_fputs(info->cleanup, REC_TYPE_END, "");
+    }
+
+    /*
+     * Retrieve the cleanup service completion status only if there are no
+     * problems.
+     */
+    if (status == 0)
+	if (vstream_fflush(info->cleanup)
+	    || attr_scan(info->cleanup, ATTR_FLAG_MISSING,
+			 RECV_ATTR_INT(MAIL_ATTR_STATUS, &status),
+			 ATTR_TYPE_END) != 1)
+	    status = 1;
+
+    /*
+     * Log successful forwarding.
+     * 
+     * XXX DSN alias and .forward expansion already report SUCCESS, so don't do
+     * it again here.
+     */
+    if (status == 0) {
+	attr.rcpt.dsn_notify =
+	    (attr.rcpt.dsn_notify == DSN_NOTIFY_SUCCESS ?
+	     DSN_NOTIFY_NEVER : attr.rcpt.dsn_notify & ~DSN_NOTIFY_SUCCESS);
+	dsb_update(attr.why, "2.0.0", "relayed", DSB_SKIP_RMTA, DSB_SKIP_REPLY,
+		   "forwarded as %s", info->queue_id);
+	status = sent(BOUNCE_FLAGS(request), SENT_ATTR(attr));
+    }
+
+    /*
+     * Cleanup.
+     */
+    vstring_free(buffer);
+    return (status);
+}
+
+/* forward_finish - complete message forwarding requests and clean up */
+
+int     forward_finish(DELIVER_REQUEST *request, DELIVER_ATTR attr, int cancel)
+{
+    HTABLE_INFO **dt_list;
+    HTABLE_INFO **dt;
+    HTABLE_INFO **sn_list;
+    HTABLE_INFO **sn;
+    HTABLE *table_snd;
+    char   *delivered;
+    char   *sender;
+    FORWARD_INFO *info;
+    int     status = cancel;
+
+    /*
+     * Sanity checks.
+     */
+    if (forward_dt == 0)
+	msg_panic("forward_finish: missing forward_init call");
+
+    /*
+     * Walk over all delivered-to header addresses and over each envelope
+     * sender address.
+     */
+    for (dt = dt_list = htable_list(forward_dt); *dt; dt++) {
+	delivered = dt[0]->key;
+	table_snd = (HTABLE *) dt[0]->value;
+	for (sn = sn_list = htable_list(table_snd); *sn; sn++) {
+	    sender = sn[0]->key;
+	    info = (FORWARD_INFO *) sn[0]->value;
+	    if (status == 0)
+		status |= forward_send(info, request, attr, delivered);
+	    if (msg_verbose)
+		msg_info("forward_finish: delivered %s sender %s status %d",
+			 delivered, sender, status);
+	    (void) vstream_fclose(info->cleanup);
+	    myfree(info->queue_id);
+	    myfree((void *) info);
+	}
+	myfree((void *) sn_list);
+	htable_free(table_snd, (void (*) (void *)) 0);
+    }
+    myfree((void *) dt_list);
+    htable_free(forward_dt, (void (*) (void *)) 0);
+    forward_dt = 0;
+    return (status);
+}