1 files changed, 129 insertions, 0 deletions
diff --git a/irc.c b/irc.c
new file mode 100644
index 0000000..02a9f64
--- /dev/null
+++ b/irc.c
@@ -0,0 +1,129 @@
+/* Copyright (C) 2018  Curtis McEnroe <june@causal.agency>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <err.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+#include <tls.h>
+#include <unistd.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+
+#include "chat.h"
+
+static struct tls *client;
+
+static void webirc(const char *pass) {
+	const char *ssh = getenv("SSH_CLIENT");
+	if (!ssh) return;
+	int len = strlen(ssh);
+	const char *sp = strchr(ssh, ' ');
+	if (sp) len = sp - ssh;
+	ircFmt(
+		"WEBIRC %s %s %.*s %.*s\r\n",
+		pass, chat.user, len, ssh, len, ssh
+	);
+}
+
+int ircConnect(const char *host, const char *port, const char *webPass) {
+	int error;
+
+	struct tls_config *config = tls_config_new();
+	error = tls_config_set_ciphers(config, "compat");
+	if (error) errx(EX_SOFTWARE, "tls_config: %s", tls_config_error(config));
+
+	client = tls_client();
+	if (!client) errx(EX_SOFTWARE, "tls_client");
+
+	error = tls_configure(client, config);
+	if (error) errx(EX_SOFTWARE, "tls_configure");
+	tls_config_free(config);
+
+	struct addrinfo *ai;
+	struct addrinfo hints = {
+		.ai_family = AF_UNSPEC,
+		.ai_socktype = SOCK_STREAM,
+		.ai_protocol = IPPROTO_TCP,
+	};
+	error = getaddrinfo(host, port, &hints, &ai);
+	if (error) errx(EX_NOHOST, "getaddrinfo: %s", gai_strerror(error));
+
+	int sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
+	if (sock < 0) err(EX_OSERR, "socket");
+
+	error = connect(sock, ai->ai_addr, ai->ai_addrlen);
+	if (error) err(EX_UNAVAILABLE, "connect");
+	freeaddrinfo(ai);
+
+	error = tls_connect_socket(client, sock, host);
+	if (error) err(EX_PROTOCOL, "tls_connect");
+
+	if (webPass) webirc(webPass);
+	ircFmt("NICK %s\r\n", chat.nick);
+	ircFmt("USER %s 0 * :%s\r\n", chat.user, chat.nick);
+
+	return sock;
+}
+
+void ircWrite(const char *ptr, size_t len) {
+	while (len) {
+		ssize_t ret = tls_write(client, ptr, len);
+		if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) continue;
+		if (ret < 0) errx(EX_IOERR, "tls_write: %s", tls_error(client));
+		ptr += ret;
+		len -= ret;
+	}
+}
+
+void ircFmt(const char *format, ...) {
+	char *buf;
+	va_list ap;
+	va_start(ap, format);
+	int len = vasprintf(&buf, format, ap);
+	va_end(ap);
+	if (!buf) err(EX_OSERR, "vasprintf");
+	if (chat.verbose) uiFmt("<<< %.*s", len - 2, buf);
+	ircWrite(buf, len);
+	free(buf);
+}
+
+static char buf[4096];
+static size_t len;
+
+void ircRead(void) {
+	ssize_t read = tls_read(client, &buf[len], sizeof(buf) - len);
+	if (read < 0) errx(EX_IOERR, "tls_read: %s", tls_error(client));
+	if (!read) {
+		uiHide();
+		exit(EX_OK);
+	}
+	len += read;
+
+	char *crlf, *line = buf;
+	while ((crlf = strnstr(line, "\r\n", &buf[len] - line))) {
+		crlf[0] = '\0';
+		if (chat.verbose) uiFmt(">>> %s", line);
+		handle(line);
+		line = &crlf[2];
+	}
+
+	len -= line - buf;
+	memmove(buf, line, len);
+}