Add CRLF support for common services

--- nc6-1.0.orig/configure.ac	2009-09-07 07:41:40.000000000 +0200
+++ nc6-1.0/configure.ac		2009-09-07 08:22:46.000000000 +0200
@@ -161,6 +161,18 @@
   LIBS="${INET6_LIBS} ${LIBS}"
 fi
 
+# CRLF option
+crlfoption="yes"
+AC_ARG_ENABLE(crlfoption, AC_HELP_STRING([--disable-crlfoption],
+  [compile without crlfoption support]),
+  [ if test x$enable_crlfoption = xno; then crlfoption="no"; fi ],
+  [ crlfoption="yes" ]
+)
+
+if test $crlfoption = "yes"; then
+  AC_DEFINE([CRLFOPTION],1,[compile with CRLF option])
+fi
+
 dnl Check for libraries
 AC_CHECK_LIB(socket, socket)
 
--- nc6-1.0.orig/docs/nc6.1.in	2009-09-07 07:41:40.000000000 +0200
+++ nc6-1.0/docs/nc6.1.in	2009-09-07 16:15:41.000000000 +0200
@@ -170,6 +170,9 @@
 .I \-w, --timeout=SECONDS
 Timeout for network connects and accepts (see "TIMEOUTS").
 .TP 13
+.I \-C
+Send CRLF as line-ending
+.TP 13
 .I \-x, --transfer
 File transfer mode (see "FILE TRANSFER").  If listen mode is
 specified, this is equivalent to "--recv-only --buffer-size=65536" otherwise
--- nc6-1.0.orig/src/circ_buf.c	2009-09-07 07:41:40.000000000 +0200
+++ nc6-1.0/src/circ_buf.c	2009-09-07 15:41:59.000000000 +0200
@@ -382,6 +382,28 @@
 
 
 
+ssize_t cb_write_crlf(circ_buf_t *cb, int fd, size_t nbytes)
+{
+	circ_buf_t cb2;
+	ssize_t cb2ptr;
+	ssize_t rr;
+
+	cb_init(&cb2, (cb->data_size * 2));
+
+	for ( cb2ptr = 0; cb2ptr < cb->data_size; cb2ptr++, rr++ ) {
+		if ( cb->buf[cb2ptr] == '\n' ) /* LF? */
+			cb_append(&cb2, (const uint8_t *)"\r\n", 2); /* replace with CRLF */
+		else
+			cb_append(&cb2, &(cb->buf[cb2ptr]), 1);
+	}
+
+	cb->data_size -= rr;
+	
+	return cb_write(&cb2, fd, nbytes);
+}
+
+
+
 ssize_t cb_send(circ_buf_t *cb, int fd, size_t nbytes,
                 struct sockaddr *dest, size_t destlen)
 {
--- nc6-1.0.orig/src/circ_buf.h	2009-09-07 07:41:40.000000000 +0200
+++ nc6-1.0/src/circ_buf.h	2009-09-07 14:41:17.000000000 +0200
@@ -55,6 +55,7 @@
                 struct sockaddr *from, size_t *fromlen);
 
 ssize_t cb_write(circ_buf_t *cb, int fd, size_t nbytes);
+ssize_t cb_write_crlf(circ_buf_t *cb, int fd, size_t nbytes);
 ssize_t cb_send(circ_buf_t *cb, int fd, size_t nbytes,
                 struct sockaddr *dest, size_t destlen);
 
--- nc6-1.0.orig/src/io_stream.c	2009-09-07 07:41:40.000000000 +0200
+++ nc6-1.0/src/io_stream.c		2009-09-07 14:40:50.000000000 +0200
@@ -359,6 +359,57 @@
 
 
 
+ssize_t ios_write_crlf(io_stream_t *ios)
+{
+	ssize_t rr;
+
+	/* check argument */
+	ios_assert(ios);
+	
+	/* should only be called if ios_schedule_write returned a true result */
+	assert(ios->fd_out >= 0);
+	assert(!cb_is_empty(ios->buf_out));
+
+	/* write as much as the mtu allows */
+	if (ios->socktype == SOCK_DGRAM)
+		rr = cb_send(ios->buf_out, ios->fd_out, ios->mtu, NULL, 0);
+	else
+		rr = cb_write_crlf(ios->buf_out, ios->fd_out, ios->mtu);
+
+	if (rr > 0) {
+		ios->sent += rr;
+#ifndef NDEBUG
+		if (very_verbose_mode())
+			warning("wrote %d bytes to %s", rr, ios->name);
+#endif
+		/* record that the ios was active */
+		gettimeofday(&(ios->last_active), NULL);
+
+		/* shutdown the write if buf_out is empty and out eof is set */
+		if ((ios->flags & IOS_OUTPUT_EOF) && cb_is_empty(ios->buf_out))
+			ios_shutdown(ios, SHUT_WR);
+
+		return rr;
+	} else if (rr == 0) {
+		/* shouldn't happen? */
+		return 0;
+	} else if (errno == EAGAIN) {
+		/* not ready? */
+		return 0;
+	} else {
+		if (very_verbose_mode()) {
+			if (errno == EPIPE)
+				warning(_("received SIGPIPE on %s"), ios->name);
+			else
+				warning(_("error writing to %s: %s"),
+				     ios->name, strerror(errno));
+		}
+		return IOS_FAILED;
+	}
+}
+
+
+
 void ios_write_eof(io_stream_t *ios)
 {
 	/* check argument */
--- nc6-1.0.orig/src/io_stream.h	2009-09-07 07:41:40.000000000 +0200
+++ nc6-1.0/src/io_stream.h		2009-09-07 14:39:16.000000000 +0200
@@ -110,6 +110,10 @@
  * should only be called if ios_schedule_write returned a true value
  * returns the total bytes read, or a negative error code */
 ssize_t ios_write(io_stream_t *ios);
+/* write from the output buffer in CDRL mode.
+ * should only be called if ios_schedule_write returned a true value
+ * returns the total bytes read, or a negative error code */
+ssize_t ios_write_crlf(io_stream_t *ios);
 
 /* error return values from ios_read/ios_write */
 #define IOS_FAILED	-1
--- nc6-1.0.orig/src/parser.c	2009-09-07 07:41:40.000000000 +0200
+++ nc6-1.0/src/parser.c	2009-09-07 14:32:08.000000000 +0200
@@ -56,6 +56,7 @@
 
 /* storage for the global flags */
 static int _verbosity_level = 0;
+static int opt_crlf = 0x00;    /* CRLF line-ending default false */
 
 /* long options */
 static const struct option long_options[] = {
@@ -160,7 +161,7 @@
 	_verbosity_level = 0;
 
 	/* option recognition loop */
-	while ((c = getopt_long(argc, argv, "46be:T:hlnp:q:s:uvw:xX",
+	while ((c = getopt_long(argc, argv, "46be:T:hlnp:q:s:uvw:xXC",
 	                        long_options, &option_index)) >= 0)
 	{
  		switch (c) {
@@ -285,6 +286,14 @@
 		case 'v':	
 			++_verbosity_level;
 			break;
+ 		case 'C':     /* CRLF line-ending */
+#ifdef CRLFOPTION
+			opt_crlf = 0x01; /* CRLF true */
+#else
+			fatal_internal(
+			"invalid option -- %c (netcat was compiled with --disable-crlfoption)\n", c);
+#endif /* CRLFOPTION */
+			break;
 		case 'w':
 			assert(optarg != NULL);
 			if (safe_atoi(optarg, &connect_timeout))
@@ -537,6 +546,13 @@
 
 
 
+bool crlf_mode()
+{
+	return ((opt_crlf == 0x00) ? false : true);
+}
+
+
+
 static void print_usage(FILE *fp)
 {
 	const char *program_name = get_program_name();
@@ -596,6 +612,9 @@
 	fprintf(fp, " -v                     %s\n",
 	              _("Increase program verbosity\n"
 "                        (call twice for max verbosity)"));
+#ifdef CRLFOPTION
+	fprintf(fp, " -C                     %s\n", _("Send CRLF as line ending"));
+#endif /* CRLFOPTION */
 	fprintf(fp, " --version              %s\n",
 	              _("Display nc6 version information"));
 	fprintf(fp, " -w, --timeout=SECONDS  %s\n",
--- nc6-1.0.orig/src/parser.h	2009-09-07 07:41:40.000000000 +0200
+++ nc6-1.0/src/parser.h	2009-09-07 14:32:26.000000000 +0200
@@ -26,6 +26,7 @@
 
 bool verbose_mode(void);
 bool very_verbose_mode(void);
+bool crlf_mode(void);
 
 void parse_arguments(int argc, char **argv, connection_attributes_t *attrs);
 
--- nc6-1.0.orig/src/readwrite.c	2009-09-07 07:41:40.000000000 +0200
+++ nc6-1.0/src/readwrite.c		2009-09-07 14:36:18.000000000 +0200
@@ -199,7 +199,10 @@
 		if (ios1_write_fd >= 0 && FD_ISSET(ios1_write_fd, &write_fdset))
 		{
 			/* ios1 is ready to write */
-			rr = ios_write(ios1);
+			if ( crlf_mode() ) 
+				rr = ios_write_crlf(ios1); /* CRLF mode */
+			else
+				rr = ios_write(ios1);
 
 			if (rr < 0) {
 				/* write failed -