static int qmgr_deliver_send_request(QMGR_ENTRY *entry, VSTREAM *stream)
{
RECIPIENT_LIST list = entry->rcpt_list;
RECIPIENT *recipient;
QMGR_MESSAGE *message = entry->message;
VSTRING *sender_buf = 0;
MSG_STATS stats;
char *sender;
int flags;
/*
* If variable envelope return path is requested, change prefix+@origin
* into prefix+user=domain@origin. Note that with VERP there is only one
* recipient per delivery.
*/
if (message->verp_delims == 0) {
sender = message->sender;
} else {
sender_buf = vstring_alloc(100);
verp_sender(sender_buf, message->verp_delims,
message->sender, list.info);
sender = vstring_str(sender_buf);
}
flags = message->tflags
| entry->queue->dflags
| (message->inspect_xport ? DEL_REQ_FLAG_BOUNCE : DEL_REQ_FLAG_DEFLT);
(void) QMGR_MSG_STATS(&stats, message);
attr_print(stream, ATTR_FLAG_NONE,
ATTR_TYPE_INT, MAIL_ATTR_FLAGS, flags,
ATTR_TYPE_STR, MAIL_ATTR_QUEUE, message->queue_name,
ATTR_TYPE_STR, MAIL_ATTR_QUEUEID, message->queue_id,
ATTR_TYPE_LONG, MAIL_ATTR_OFFSET, message->data_offset,
ATTR_TYPE_LONG, MAIL_ATTR_SIZE, message->cont_length,
ATTR_TYPE_STR, MAIL_ATTR_NEXTHOP, entry->queue->nexthop,
ATTR_TYPE_STR, MAIL_ATTR_ENCODING, message->encoding,
ATTR_TYPE_STR, MAIL_ATTR_SENDER, sender,
ATTR_TYPE_STR, MAIL_ATTR_DSN_ENVID, message->dsn_envid,
ATTR_TYPE_INT, MAIL_ATTR_DSN_RET, message->dsn_ret,
ATTR_TYPE_FUNC, msg_stats_print, (void *) &stats,
/* XXX Should be encapsulated with ATTR_TYPE_FUNC. */
ATTR_TYPE_STR, MAIL_ATTR_LOG_CLIENT_NAME, message->client_name,
ATTR_TYPE_STR, MAIL_ATTR_LOG_CLIENT_ADDR, message->client_addr,
ATTR_TYPE_STR, MAIL_ATTR_LOG_CLIENT_PORT, message->client_port,
ATTR_TYPE_STR, MAIL_ATTR_LOG_PROTO_NAME, message->client_proto,
ATTR_TYPE_STR, MAIL_ATTR_LOG_HELO_NAME, message->client_helo,
/* XXX Should be encapsulated with ATTR_TYPE_FUNC. */
ATTR_TYPE_STR, MAIL_ATTR_SASL_METHOD, message->sasl_method,
ATTR_TYPE_STR, MAIL_ATTR_SASL_USERNAME, message->sasl_username,
ATTR_TYPE_STR, MAIL_ATTR_SASL_SENDER, message->sasl_sender,
/* XXX Ditto if we want to pass TLS certificate info. */
ATTR_TYPE_STR, MAIL_ATTR_LOG_IDENT, message->log_ident,
ATTR_TYPE_STR, MAIL_ATTR_RWR_CONTEXT, message->rewrite_context,
ATTR_TYPE_INT, MAIL_ATTR_RCPT_COUNT, list.len,
ATTR_TYPE_END);
if (sender_buf != 0)
vstring_free(sender_buf);
for (recipient = list.info; recipient < list.info + list.len; recipient++)
attr_print(stream, ATTR_FLAG_NONE,
ATTR_TYPE_FUNC, rcpt_print, (void *) recipient,
ATTR_TYPE_END);
if (vstream_fflush(stream) != 0) {
msg_warn("write to process (%s): %m", entry->queue->transport->name);
return (-1);
} else {
if (msg_verbose)
msg_info("qmgr_deliver: site `%s'", entry->queue->name);
return (0);
}
}
static void qmgr_message_resolve(QMGR_MESSAGE *message)
{
static ARGV *defer_xport_argv;
RECIPIENT_LIST list = message->rcpt_list;
RECIPIENT *recipient;
QMGR_TRANSPORT *transport = 0;
QMGR_QUEUE *queue = 0;
RESOLVE_REPLY reply;
VSTRING *queue_name;
char *at;
char **cpp;
char *nexthop;
ssize_t len;
int status;
DSN dsn;
MSG_STATS stats;
DSN *saved_dsn;
#define STREQ(x,y) (strcmp(x,y) == 0)
#define STR vstring_str
#define LEN VSTRING_LEN
resolve_clnt_init(&reply);
queue_name = vstring_alloc(1);
for (recipient = list.info; recipient < list.info + list.len; recipient++) {
/*
* Redirect overrides all else. But only once (per entire message).
* For consistency with the remainder of Postfix, rewrite the address
* to canonical form before resolving it.
*/
if (message->redirect_addr) {
if (recipient > list.info) {
recipient->u.queue = 0;
continue;
}
message->rcpt_offset = 0;
message->rcpt_unread = 0;
rewrite_clnt_internal(REWRITE_CANON, message->redirect_addr,
reply.recipient);
RECIPIENT_UPDATE(recipient->address, STR(reply.recipient));
if (qmgr_resolve_one(message, recipient,
recipient->address, &reply) < 0)
continue;
if (!STREQ(recipient->address, STR(reply.recipient)))
RECIPIENT_UPDATE(recipient->address, STR(reply.recipient));
}
/*
* Content filtering overrides the address resolver.
*
* XXX Bypass content_filter inspection for user-generated probes
* (sendmail -bv). MTA-generated probes never have the "please filter
* me" bits turned on, but we handle them here anyway for the sake of
* future proofing.
*/
#define FILTER_WITHOUT_NEXTHOP(filter, next) \
(((next) = split_at((filter), ':')) == 0 || *(next) == 0)
#define RCPT_WITHOUT_DOMAIN(rcpt, next) \
((next = strrchr(rcpt, '@')) == 0 || *++(next) == 0)
else if (message->filter_xport
&& (message->tflags & DEL_REQ_TRACE_ONLY_MASK) == 0) {
reply.flags = 0;
vstring_strcpy(reply.transport, message->filter_xport);
if (FILTER_WITHOUT_NEXTHOP(STR(reply.transport), nexthop)
&& *(nexthop = var_def_filter_nexthop) == 0
&& RCPT_WITHOUT_DOMAIN(recipient->address, nexthop))
nexthop = var_myhostname;
vstring_strcpy(reply.nexthop, nexthop);
vstring_strcpy(reply.recipient, recipient->address);
}
/*
* Resolve the destination to (transport, nexthop, address). The
* result address may differ from the one specified by the sender.
*/
else {
if (qmgr_resolve_one(message, recipient,
recipient->address, &reply) < 0)
continue;
if (!STREQ(recipient->address, STR(reply.recipient)))
RECIPIENT_UPDATE(recipient->address, STR(reply.recipient));
}
/*
* Bounce null recipients. This should never happen, but is most
* likely the result of a fault in a different program, so aborting
* the queue manager process does not help.
*/
if (recipient->address[0] == 0) {
QMGR_REDIRECT(&reply, MAIL_SERVICE_ERROR,
"5.1.3 null recipient address");
}
/*
* Discard mail to the local double bounce address here, so this
* system can run without a local delivery agent. They'd still have
* to configure something for mail directed to the local postmaster,
* though, but that is an RFC requirement anyway.
*
* XXX This lookup should be done in the resolver, and the mail should
* be directed to a general-purpose null delivery agent.
*/
if (reply.flags & RESOLVE_CLASS_LOCAL) {
at = strrchr(STR(reply.recipient), '@');
len = (at ? (at - STR(reply.recipient))
: strlen(STR(reply.recipient)));
if (strncasecmp(STR(reply.recipient), var_double_bounce_sender,
len) == 0
&& !var_double_bounce_sender[len]) {
status = sent(message->tflags, message->queue_id,
QMGR_MSG_STATS(&stats, message), recipient,
"none", DSN_SIMPLE(&dsn, "2.0.0",
"undeliverable postmaster notification discarded"));
if (status == 0) {
deliver_completed(message->fp, recipient->offset);
#if 0
/* It's the default verification probe sender address. */
msg_warn("%s: undeliverable postmaster notification discarded",
message->queue_id);
#endif
} else
message->flags |= status;
continue;
}
}
/*
* Optionally defer deliveries over specific transports, unless the
* restriction is lifted temporarily.
*/
if (*var_defer_xports && (message->qflags & QMGR_FLUSH_DFXP) == 0) {
if (defer_xport_argv == 0)
defer_xport_argv = argv_split(var_defer_xports, CHARS_COMMA_SP);
for (cpp = defer_xport_argv->argv; *cpp; cpp++)
if (strcmp(*cpp, STR(reply.transport)) == 0)
break;
if (*cpp) {
QMGR_REDIRECT(&reply, MAIL_SERVICE_RETRY,
"4.3.2 deferred transport");
}
}
/*
* Look up or instantiate the proper transport.
*/
if (transport == 0 || !STREQ(transport->name, STR(reply.transport))) {
if ((transport = qmgr_transport_find(STR(reply.transport))) == 0)
transport = qmgr_transport_create(STR(reply.transport));
queue = 0;
}
/*
* This message is being flushed. If need-be unthrottle the
* transport.
*/
if ((message->qflags & QMGR_FLUSH_EACH) != 0
&& QMGR_TRANSPORT_THROTTLED(transport))
qmgr_transport_unthrottle(transport);
/*
* This transport is dead. Defer delivery to this recipient.
*/
if (QMGR_TRANSPORT_THROTTLED(transport)) {
saved_dsn = transport->dsn;
if ((transport = qmgr_error_transport(MAIL_SERVICE_RETRY)) != 0) {
nexthop = qmgr_error_nexthop(saved_dsn);
vstring_strcpy(reply.nexthop, nexthop);
myfree(nexthop);
queue = 0;
} else {
qmgr_defer_recipient(message, recipient, saved_dsn);
continue;
}
}
/*
* The nexthop destination provides the default name for the
* per-destination queue. When the delivery agent accepts only one
* recipient per delivery, give each recipient its own queue, so that
* deliveries to different recipients of the same message can happen
* in parallel, and so that we can enforce per-recipient concurrency
* limits and prevent one recipient from tying up all the delivery
* agent resources. We use recipient@nexthop as queue name rather
* than the actual recipient domain name, so that one recipient in
* multiple equivalent domains cannot evade the per-recipient
* concurrency limit. Split the address on the recipient delimiter if
* one is defined, so that extended addresses don't get extra
* delivery slots.
*
* Fold the result to lower case so that we don't have multiple queues
* for the same name.
*
* Important! All recipients in a queue must have the same nexthop
* value. It is OK to have multiple queues with the same nexthop
* value, but only when those queues are named after recipients.
*
* The single-recipient code below was written for local(8) like
* delivery agents, and assumes that all domains that deliver to the
* same (transport + nexthop) are aliases for $nexthop. Delivery
* concurrency is changed from per-domain into per-recipient, by
* changing the queue name from nexthop into localpart@nexthop.
*
* XXX This assumption is incorrect when different destinations share
* the same (transport + nexthop). In reality, such transports are
* rarely configured to use single-recipient deliveries. The fix is
* to decouple the per-destination recipient limit from the
* per-destination concurrency.
*/
vstring_strcpy(queue_name, STR(reply.nexthop));
if (strcmp(transport->name, MAIL_SERVICE_ERROR) != 0
&& strcmp(transport->name, MAIL_SERVICE_RETRY) != 0
&& transport->recipient_limit == 1) {
/* Copy the recipient localpart. */
at = strrchr(STR(reply.recipient), '@');
len = (at ? (at - STR(reply.recipient))
: strlen(STR(reply.recipient)));
vstring_strncpy(queue_name, STR(reply.recipient), len);
/* Remove the address extension from the recipient localpart. */
if (*var_rcpt_delim && split_addr(STR(queue_name), var_rcpt_delim))
vstring_truncate(queue_name, strlen(STR(queue_name)));
/* Assume the recipient domain is equivalent to nexthop. */
vstring_sprintf_append(queue_name, "@%s", STR(reply.nexthop));
}
lowercase(STR(queue_name));
/*
* This transport is alive. Find or instantiate a queue for this
* recipient.
*/
if (queue == 0 || !STREQ(queue->name, STR(queue_name))) {
if ((queue = qmgr_queue_find(transport, STR(queue_name))) == 0)
queue = qmgr_queue_create(transport, STR(queue_name),
STR(reply.nexthop));
}
/*
* This message is being flushed. If need-be unthrottle the queue.
*/
if ((message->qflags & QMGR_FLUSH_EACH) != 0
&& QMGR_QUEUE_THROTTLED(queue))
qmgr_queue_unthrottle(queue);
/*
* This queue is dead. Defer delivery to this recipient.
*/
if (QMGR_QUEUE_THROTTLED(queue)) {
saved_dsn = queue->dsn;
if ((queue = qmgr_error_queue(MAIL_SERVICE_RETRY, saved_dsn)) == 0) {
qmgr_defer_recipient(message, recipient, saved_dsn);
continue;
}
}
/*
* This queue is alive. Bind this recipient to this queue instance.
*/
recipient->u.queue = queue;
}
resolve_clnt_free(&reply);
vstring_free(queue_name);
}
