1 files changed, 138 insertions, 0 deletions
diff --git a/state.c b/state.c
new file mode 100644
index 0000000..7b96a0b
--- /dev/null
+++ b/state.c
@@ -0,0 +1,138 @@
+/* Copyright (C) 2019  C. 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 <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+
+#include "bounce.h"
+
+enum { ISupportCap = 32 };
+static struct {
+	char *origin;
+	char *nick;
+	char *welcome;
+	char *yourHost;
+	char *created;
+	char *myInfo[4];
+	struct {
+		char *values[ISupportCap];
+		size_t len;
+	} iSupport;
+} state;
+
+bool stateReady(void) {
+	return state.origin
+		&& state.nick
+		&& state.welcome
+		&& state.yourHost
+		&& state.created
+		&& state.myInfo[0]
+		&& state.iSupport.len;
+}
+
+static void set(char **field, const char *value) {
+	if (*field) free(*field);
+	*field = NULL;
+	if (value) {
+		*field = strdup(value);
+		if (!*field) err(EX_OSERR, "strdup");
+	}
+}
+
+enum { ParamCap = 15 };
+struct Command {
+	const char *origin;
+	const char *name;
+	const char *target;
+	const char *params[ParamCap];
+};
+typedef void Handler(struct Command);
+
+static void cap(struct Command cmd) {
+	bool ack = cmd.params[0] && !strcmp(cmd.params[0], "ACK");
+	bool sasl = cmd.params[1] && !strcmp(cmd.params[1], "sasl");
+	if (!ack || !sasl) errx(EX_CONFIG, "server does not support SASL");
+	serverAuth();
+}
+
+static void replyWelcome(struct Command cmd) {
+	set(&state.origin, cmd.origin);
+	set(&state.nick, cmd.target);
+	set(&state.welcome, cmd.params[0]);
+}
+
+static void replyYourHost(struct Command cmd) {
+	set(&state.yourHost, cmd.params[0]);
+}
+
+static void replyCreated(struct Command cmd) {
+	set(&state.created, cmd.params[0]);
+}
+
+static void replyMyInfo(struct Command cmd) {
+	set(&state.myInfo[0], cmd.params[0]);
+	set(&state.myInfo[1], cmd.params[1]);
+	set(&state.myInfo[2], cmd.params[2]);
+	set(&state.myInfo[3], cmd.params[3]);
+}
+
+static void replyISupport(struct Command cmd) {
+	for (size_t i = 0; i < ParamCap; ++i) {
+		if (!cmd.params[i] || strchr(cmd.params[i], ' ')) break;
+		if (state.iSupport.len == ISupportCap) break;
+		set(&state.iSupport.values[state.iSupport.len++], cmd.params[i]);
+	}
+}
+
+static const struct {
+	const char *cmd;
+	Handler *fn;
+} Handlers[] = {
+	{ "001", replyWelcome },
+	{ "002", replyYourHost },
+	{ "003", replyCreated },
+	{ "004", replyMyInfo },
+	{ "005", replyISupport },
+	{ "CAP", cap },
+};
+static const size_t HandlersLen = sizeof(Handlers) / sizeof(Handlers[0]);
+
+void stateParse(char *line) {
+	struct Command cmd = {0};
+	if (line[0] == ':') {
+		cmd.origin = 1 + strsep(&line, " ");
+		if (!line) errx(EX_PROTOCOL, "eof after origin");
+	}
+
+	cmd.name = strsep(&line, " ");
+	cmd.target = strsep(&line, " ");
+	for (size_t i = 0; line && i < ParamCap; ++i) {
+		if (line[0] == ':') {
+			cmd.params[i] = line;
+			break;
+		}
+		cmd.params[i] = strsep(&line, " ");
+	}
+
+	for (size_t i = 0; i < HandlersLen; ++i) {
+		if (strcmp(cmd.name, Handlers[i].cmd)) continue;
+		Handlers[i].fn(cmd);
+		break;
+	}
+}