crond: add handling of "MAILTO=user" lines

sendmail: handle a case when the whole mail comes from stdin
(and no separate sender/subj is provided)
both by dronnikov AT gmail.com

function                                             old     new   delta
sendgetmail_main                                    1509    1674    +165
SynchronizeFile                                      671     767     +96
packed_usage                                       24054   24088     +34
crond_main                                          1404    1420     +16
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/0 up/down: 311/0)             Total: 311 bytes

1 files changed, 26 insertions, 2 deletions

diff --git a/networking/sendmail.c b/networking/sendmail.c
index 973d712..242bb0e 100644
--- a/networking/sendmail.c
+++ b/networking/sendmail.c
@@ -273,6 +273,7 @@ int sendgetmail_main(int argc ATTRIBUTE_UNUSED, char **argv)
 
 		OPTS_c = 1 << 6,        // sendmail: assumed charset
 		OPTS_t = 1 << 7,        // sendmail: recipient(s)
+		OPTS_i = 1 << 8,        // sendmail: ignore lone dots in message body (implied)
 	};
 
 	const char *options;
@@ -288,8 +289,8 @@ int sendgetmail_main(int argc ATTRIBUTE_UNUSED, char **argv)
 		// SENDMAIL
 		// save initial stdin (body or attachements can be piped!)
 		xdup2(STDIN_FILENO, INITIAL_STDIN_FILENO);
-		opt_complementary = "-2:w+:t:t::"; // count(-t) > 0
-		options = "w:U:P:X" "ns:c:t:";
+		opt_complementary = "-2:w+:t::";
+		options = "w:U:P:X" "ns:c:t:i";
 	} else {
 		// FETCHMAIL
 		opt_after_connect = NULL;
@@ -346,6 +347,29 @@ int sendgetmail_main(int argc ATTRIBUTE_UNUSED, char **argv)
 		// get the sender
 		opt_from = sane(*argv++);
 
+		// if no recipients _and_ no body files specified -> enter all-included mode
+		// i.e. scan stdin for To: and Subject: lines ...
+		// ... and then use the rest of stdin as message body
+		if (!opt_recipients && !*argv) {
+			// fetch recipients and (optionally) subject
+			char *s;
+			while ((s = xmalloc_reads(INITIAL_STDIN_FILENO, NULL, NULL)) != NULL) {
+				if (0 == strncmp("To: ", s, 4)) {
+					llist_add_to_end(&opt_recipients, s+4);
+				} else if (0 == strncmp("Subject: ", s, 9)) {
+					opt_subject = s+9;
+					opts |= OPTS_s;
+				} else {
+					char first = s[0];
+					free(s);
+					if (!first)
+						break; // empty line
+				}
+			}
+			// order to read body from stdin
+			*--argv = (char *)"-";
+		}
+
 		// introduce to server
 		// we should start with modern EHLO
 		if (250 != smtp_checkp("EHLO %s", opt_from, -1)) {