Start IRC client

It dumps lines from the server onto the curses window.

.gitignore

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+chat
+tags

Makefile

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+CFLAGS += -Wall -Wextra -Wpedantic
+CFLAGS += -I/usr/local/include
+LDFLAGS += -L/usr/local/lib
+LDLIBS = -lcurses -ltls
+
+all: tags chat
+
+tags: *.c
+	ctags -w *.c
+
+clean:
+	rm -f tags chat

chat.c

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+/* 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 <curses.h>
+#include <err.h>
+#include <locale.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <poll.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sysexits.h>
+#include <tls.h>
+#include <unistd.h>
+
+static void curse(void) {
+	setlocale(LC_CTYPE, "");
+	initscr();
+	keypad(stdscr, true);
+	start_color();
+	assume_default_colors(-1, -1);
+}
+
+static void writeAll(struct tls *client, 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;
+	}
+}
+
+static void command(struct tls *client, 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");
+	writeAll(client, buf, len);
+	free(buf);
+}
+
+static void handle(struct tls *client, const char *line) {
+	addstr(line);
+	addch('\n');
+	refresh();
+}
+
+static void readClient(struct tls *client) {
+	static char buf[4096];
+	static size_t fill;
+
+	ssize_t size = tls_read(client, buf + fill, sizeof(buf) - fill);
+	if (size < 0) errx(EX_IOERR, "tls_read: %s", tls_error(client));
+	fill += size;
+
+	char *end;
+	char *line = buf;
+	while ((end = strnstr(line, "\r\n", buf + fill - line))) {
+		end[0] = '\0';
+		handle(client, line);
+		line = &end[2];
+	}
+
+	fill -= line - buf;
+	memmove(buf, line, fill);
+}
+
+static void readInput(void) {
+}
+
+static void webirc(struct tls *client, const char *pass, const char *user) {
+	const char *ssh = getenv("SSH_CLIENT");
+	if (!ssh) return;
+	int len = strchrnul(ssh, ' ') - ssh;
+	command(client, "WEBIRC %s %s %.*s %.*s\r\n", pass, user, len, ssh, len, ssh);
+}
+
+int main(int argc, char *argv[]) {
+	int error;
+
+	const char *host = NULL;
+	const char *port = "6697";
+	const char *join = NULL;
+	const char *nick = NULL;
+	const char *webPass = NULL;
+
+	int opt;
+	while (0 < (opt = getopt(argc, argv, "h:j:n:p:w:"))) {
+		switch (opt) {
+			break; case 'h': host = optarg;
+			break; case 'j': join = optarg;
+			break; case 'n': nick = optarg;
+			break; case 'p': port = optarg;
+			break; case 'w': webPass = optarg;
+			break; default:  return EX_USAGE;
+		}
+	}
+
+	curse();
+
+	char hostBuf[64] = {0};
+	char joinBuf[64] = {0};
+	char nickBuf[16] = {0};
+	if (!host) {
+		addstr("Host: ");
+		getnstr(hostBuf, sizeof(hostBuf) - 1);
+		host = hostBuf;
+	}
+	if (!join) {
+		addstr("Join: ");
+		getnstr(joinBuf, sizeof(joinBuf) - 1);
+		join = joinBuf;
+	}
+	if (!nick) {
+		addstr("Nick: ");
+		getnstr(nickBuf, sizeof(nickBuf) - 1);
+		nick = nickBuf;
+	}
+
+	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);
+
+	struct tls *client = tls_client();
+	if (!client) errx(EX_OSERR, "tls_client");
+
+	struct tls_config *config = tls_config_new();
+	error = tls_configure(client, config);
+	if (error) errx(EX_OSERR, "tls_configure");
+	tls_config_free(config);
+
+	error = tls_connect_socket(client, sock, host);
+	if (error) err(EX_PROTOCOL, "tls_connect");
+
+	if (webPass) webirc(client, webPass, nick);
+	command(client, "NICK %s\r\n", nick);
+	command(client, "USER %s x x :%s\r\n", nick, nick);
+
+	struct pollfd fds[2] = {
+		{ .fd = STDIN_FILENO, .events = POLLIN },
+		{ .fd = sock, .events = POLLIN },
+	};
+	while (0 < poll(fds, 2, -1)) {
+		if (fds[0].revents) readInput();
+		if (fds[1].revents) readClient(client);
+	}
+	err(EX_IOERR, "poll");
+}