*************************************************/
/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim Maintainers 2020 */
/* See the file NOTICE for conditions of use and distribution. */
/* A number of functions for driving outgoing SMTP calls. */
return FALSE;
}
-while (isspace(*expint)) expint++;
-if (*expint == 0) return TRUE;
+Uskip_whitespace(&expint);
+if (!*expint) return TRUE;
+/* we just tested to ensure no taint, so big_buffer is ok */
while ((iface = string_nextinlist(&expint, &sep, big_buffer,
big_buffer_size)))
{
{
# ifdef __FreeBSD__
struct tcp_info tinfo;
-int val;
-socklen_t len = sizeof(val);
+socklen_t len = sizeof(tinfo);
-/* The observability as of 12.1 is not useful as a client, only telling us that
-a TFO option was used on SYN. It could have been a TFO-R, or ignored by the
-server. */
+/* A getsockopt TCP_FASTOPEN unfortunately returns "was-used" for a TFO/R as
+well as a TFO/C. Use what we can of the Linux hack below; reliability issues ditto. */
+switch (tcp_out_fastopen)
+ {
+ case TFO_ATTEMPTED_NODATA:
+ if ( getsockopt(sock, IPPROTO_TCP, TCP_INFO, &tinfo, &len) == 0
+ && tinfo.tcpi_state == TCPS_SYN_SENT
+ && tinfo.__tcpi_unacked > 0
+ )
+ {
+ DEBUG(D_transport|D_v)
+ debug_printf("TCP_FASTOPEN tcpi_unacked %d\n", tinfo.__tcpi_unacked);
+ tcp_out_fastopen = TFO_USED_NODATA;
+ }
+ break;
+ /*
+ case TFO_ATTEMPTED_DATA:
+ case TFO_ATTEMPTED_DATA:
+ if (tinfo.tcpi_options & TCPI_OPT_SYN_DATA) XXX no equvalent as of 12.2
+ */
+ }
-/*
-if (tcp_out_fastopen == TFO_ATTEMPTED_NODATA || tcp_out_fastopen == TFO_ATTEMPTED_DATA)
- if (getsockopt(sock, IPPROTO_TCP, TCP_FASTOPEN, &val, &len) == 0 && val != 0) {}
-*/
switch (tcp_out_fastopen)
{
- case TFO_ATTEMPTED_NODATA: tcp_out_fastopen = TFO_USED_NODATA; break;
case TFO_ATTEMPTED_DATA: tcp_out_fastopen = TFO_USED_DATA; break;
default: break; /* compiler quietening */
}
#endif
-/* Arguments as for smtp_connect(), plus
- early_data if non-NULL, idenmpotent data to be sent -
+/* Arguments:
+ host host item containing name and address and port
+ host_af AF_INET or AF_INET6
+ port TCP port number
+ interface outgoing interface address or NULL
+ tb transport
+ timeout timeout value or 0
+ early_data if non-NULL, idempotent data to be sent -
preferably in the TCP SYN segment
+ Special case: non-NULL but with NULL blob.data - caller is
+ client-data-first (eg. TLS-on-connect) and a lazy-TCP-connect is
+ acceptable.
Returns: connected socket number, or -1 with errno set
*/
else
{
#ifdef TCP_FASTOPEN
+ /* See if TCP Fast Open usable. Default is a traditional 3WHS connect */
if (verify_check_given_host(CUSS &ob->hosts_try_fastopen, host) == OK)
- fastopen_blob = early_data ? early_data : &tcp_fastopen_nodata;
+ {
+ if (!early_data)
+ fastopen_blob = &tcp_fastopen_nodata; /* TFO, with no data */
+ else if (early_data->data)
+ fastopen_blob = early_data; /* TFO, with data */
+# ifdef TCP_FASTOPEN_CONNECT
+ else
+ { /* expecting client data */
+ debug_printf(" set up lazy-connect\n");
+ setsockopt(sock, IPPROTO_TCP, TCP_FASTOPEN_CONNECT, US &on, sizeof(on));
+ /* fastopen_blob = NULL; lazy TFO, triggered by data write */
+ }
+# endif
+ }
#endif
if (ip_connect(sock, host_af, host->address, port, timeout, fastopen_blob) < 0)
save_errno = errno;
else if (early_data && !fastopen_blob && early_data->data && early_data->len)
{
+ /* We had some early-data to send, but couldn't do TFO */
HDEBUG(D_transport|D_acl|D_v)
debug_printf("sending %ld nonTFO early-data\n", (long)early_data->len);
-#ifdef TCP_QUICKACK
+#ifdef TCP_QUICKACK_notdef
(void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
#endif
if (send(sock, early_data->data, early_data->len, 0) < 0)
save_errno = errno;
}
+#ifdef TCP_QUICKACK_notdef
+ /* Under TFO (with openssl & pipe-conn; testcase 4069, as of
+ 5.10.8-100.fc32.x86_64) this seems to be inop.
+ Perhaps overwritten when we (client) go -> ESTABLISHED on seeing the 3rd-ACK?
+ For that case, added at smtp_reap_banner(). */
+ (void) setsockopt(sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
+#endif
}
/* Either bind() or connect() failed */
{
if (host->port != PORT_NONE)
{
- HDEBUG(D_transport|D_acl|D_v)
+ HDEBUG(D_transport|D_acl|D_v) if (port != host->port)
debug_printf_indent("Transport port=%d replaced by host-specific port=%d\n", port,
host->port);
port = host->port;
Arguments:
sc details for making connection: host, af, interface, transport
early_data if non-NULL, data to be sent - preferably in the TCP SYN segment
+ Special case: non-NULL but with NULL blob.data - caller is
+ client-data-first (eg. TLS-on-connect) and a lazy-TCP-connect is
+ acceptable.
Returns: connected socket number, or -1 with errno set
*/
rc = n;
}
else
-
+ {
rc = send(outblock->cctx->sock, outblock->buffer, n,
#ifdef MSG_MORE
more ? MSG_MORE : 0
0
#endif
);
+
+#if defined(__linux__)
+ /* This is a workaround for a current linux kernel bug: as of
+ 5.6.8-200.fc31.x86_64 small (<MSS) writes get delayed by about 200ms,
+ This is despite NODELAY being active.
+ https://bugzilla.redhat.com/show_bug.cgi?id=1803806 */
+
+ if (!more)
+ setsockopt(outblock->cctx->sock, IPPROTO_TCP, TCP_CORK, &off, sizeof(off));
+#endif
+ }
}
if (rc <= 0)
while (!isspace(*p)) p++;
while (isspace(*p)) p++;
}
- while (*p != 0) *p++ = '*';
+ while (*p) *p++ = '*';
}
- HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP>> %s\n", big_buffer);
+ HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP%c> %s\n",
+ mode == SCMD_BUFFER ? '|' : mode == SCMD_MORE ? '+' : '>',
+ big_buffer);
}
if (mode != SCMD_BUFFER)
timelimit deadline for reading the lime, seconds past epoch
Returns: length of a line that has been put in the buffer
- -1 otherwise, with errno set
+ -1 otherwise, with errno set, and inblock->ptr adjusted
*/
static int
{
*p = 0; /* Leave malformed line for error message */
errno = ERRNO_SMTPFORMAT;
+ inblock->ptr = ptr;
return -1;
}
}
/* Get here if there has been some kind of recv() error; errno is set, but we
ensure that the result buffer is empty before returning. */
+inblock->ptr = inblock->ptrend = inblock->buffer;
*buffer = 0;
return -1;
}
git://git.exim.org / exim.git / blobdiff