Allow plaintext connections with -P

README.7

@@ -56,6 +56,9 @@ the
 option enables tight sandboxing.
 Sandboxing is always used on
 .Ox .
+.It
+Plaintext support:
+It's usually less secure than TLS, but who cares.
 .El
 .
 .Ss Non-features
@@ -95,10 +98,6 @@ Protocol coverage:
 IRCv3 extensions are implemented only
 where they contribute to
 the intended user experience.
-.It
-Cleartext IRC:
-TLS is now ubiquitous
-and certificates are easy to obtain.
 .El
 .
 .Sh INSTALLING

catgirl.1

@@ -8,7 +8,7 @@
 .
 .Sh SYNOPSIS
 .Nm
-.Op Fl KRelqv
+.Op Fl KPRelqv
 .Op Fl C Ar copy
 .Op Fl H Ar hash
 .Op Fl I Ar highlight
@@ -188,6 +188,9 @@ The default is the first available of
 .Xr open 1 ,
 .Xr xdg-open 1 .
 .
+.It Fl P | Cm plaintext
+Don't use TLS for the server connection.
+.
 .It Fl R | Cm restrict
 Disable the
 .Ic /copy ,

chat.c

@@ -226,6 +226,7 @@ int main(int argc, char *argv[]) {
 	setlocale(LC_CTYPE, "");
 
 	bool insecure = false;
+	bool useTLS = true;
 	bool printCert = false;
 	const char *bind = NULL;
 	const char *host = NULL;
@@ -249,6 +250,7 @@ int main(int argc, char *argv[]) {
 		{ .val = 'K', .name = "kiosk", no_argument },
 		{ .val = 'N', .name = "notify", required_argument },
 		{ .val = 'O', .name = "open", required_argument },
+		{ .val = 'P', .name = "plaintext", no_argument },
 		{ .val = 'R', .name = "restrict", no_argument },
 		{ .val = 'S', .name = "bind", required_argument },
 		{ .val = 'T', .name = "timestamp", optional_argument },
@@ -290,6 +292,7 @@ int main(int argc, char *argv[]) {
 			break; case 'K': self.kiosk = true;
 			break; case 'N': utilPush(&uiNotifyUtil, optarg);
 			break; case 'O': utilPush(&urlOpenUtil, optarg);
+			break; case 'P': useTLS = false;
 			break; case 'R': self.restricted = true;
 			break; case 'S': bind = optarg;
 			break; case 'T': {
@@ -326,7 +329,7 @@ int main(int argc, char *argv[]) {
 		int error = pledge("stdio inet dns", NULL);
 		if (error) err(EX_OSERR, "pledge");
 #endif
-		ircConfig(true, NULL, NULL, NULL);
+		ircConfig(useTLS, true, NULL, NULL, NULL);
 		ircConnect(bind, host, port);
 		ircPrintCert();
 		ircClose();
@@ -373,7 +376,7 @@ int main(int argc, char *argv[]) {
 
 	inputCompleteAdd();
 
-	ircConfig(insecure, trust, cert, priv);
+	ircConfig(useTLS, insecure, trust, cert, priv);
 
 	uiInit();
 	sig_t cursesWinch = signal(SIGWINCH, signalHandler);

chat.h

@@ -235,7 +235,7 @@ struct Message {
 };
 
 void ircConfig(
-	bool insecure, const char *trust, const char *cert, const char *priv
+	bool useTLS, bool insecure, const char *trust, const char *cert, const char *priv
 );
 int ircConnect(const char *bind, const char *host, const char *port);
 void ircHandshake(void);

irc.c

@@ -46,13 +46,16 @@
 
 static struct tls *client;
 static struct tls_config *config;
+static int sock = -1;
 
 void ircConfig(
-	bool insecure, const char *trust, const char *cert, const char *priv
+	bool useTLS, bool insecure, const char *trust, const char *cert, const char *priv
 ) {
 	int error = 0;
 	char buf[PATH_MAX];
 
+	if (!useTLS) return;
+
 	config = tls_config_new();
 	if (!config) errx(EX_SOFTWARE, "tls_config_new");
 
@@ -107,10 +110,7 @@ void ircConfig(
 }
 
 int ircConnect(const char *bindHost, const char *host, const char *port) {
-	assert(client);
-
 	int error;
-	int sock = -1;
 	struct addrinfo *head;
 	struct addrinfo hints = {
 		.ai_family = AF_UNSPEC,
@@ -159,14 +159,18 @@ int ircConnect(const char *bindHost, const char *host, const char *port) {
 	freeaddrinfo(head);
 
 	fcntl(sock, F_SETFD, FD_CLOEXEC);
+	if (client) {
 		error = tls_connect_socket(client, sock, host);
 		if (error) errx(EX_PROTOCOL, "tls_connect: %s", tls_error(client));
+	}
 
 	return sock;
 }
 
 void ircHandshake(void) {
 	int error;
+	if (!config) return;
+
 	do {
 		error = tls_handshake(client);
 	} while (error == TLS_WANT_POLLIN || error == TLS_WANT_POLLOUT);
@@ -177,6 +181,8 @@ void ircHandshake(void) {
 
 void ircPrintCert(void) {
 	size_t len;
+	if (!config) return;
+
 	ircHandshake();
 	const byte *pem = tls_peer_cert_chain_pem(client, &len);
 	printf("subject= %s\n", tls_peer_cert_subject(client));
@@ -198,7 +204,7 @@ static void debug(const char *pre, const char *line) {
 }
 
 void ircSend(const char *ptr, size_t len) {
-	assert(client);
+	if (client) {
 		while (len) {
 			ssize_t ret = tls_write(client, ptr, len);
 			if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) continue;
@@ -206,6 +212,15 @@ void ircSend(const char *ptr, size_t len) {
 			ptr += ret;
 			len -= ret;
 		}
+	} else {
+		assert(sock != -1);
+		while (len) {
+			ssize_t ret = write(sock, ptr, len);
+			if (ret < 0) errx(EX_IOERR, "write: %s", "TODO how the fuck does errno work again");
+			ptr += ret;
+			len -= ret;
+		}
+	}
 }
 
 void ircFormat(const char *format, ...) {
@@ -284,12 +299,19 @@ void ircRecv(void) {
 	static char buf[MessageCap];
 	static size_t len = 0;
 
-	assert(client);
+	if (client) {
 		ssize_t ret = tls_read(client, &buf[len], sizeof(buf) - len);
 		if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) return;
 		if (ret < 0) errx(EX_IOERR, "tls_read: %s", tls_error(client));
 		if (!ret) errx(EX_PROTOCOL, "server closed connection");
 		len += ret;
+	} else {
+		assert(sock != 1);
+		ssize_t ret = read(sock, &buf[len], sizeof(buf) - len);
+		if (ret < 0) errx(EX_IOERR, "read: %s", "TODO here too");
+		if (!ret) errx(EX_PROTOCOL, "server closed connection");
+		len += ret;
+	}
 
 	char *crlf;
 	char *line = buf;
@@ -308,6 +330,10 @@ void ircRecv(void) {
 }
 
 void ircClose(void) {
+	if (client) {
 		tls_close(client);
 		tls_free(client);
+	} else {
+		close(sock);
+	}
 }