edit: Implement completely unchecked

1 files changed, 454 insertions, 0 deletions

diff --git a/extra/edit/edit.c b/extra/edit/edit.c
new file mode 100644
index 0000000..6be3d5b
--- /dev/null
+++ b/extra/edit/edit.c
@@ -0,0 +1,454 @@
+/* Copyright (C) 2022  June McEnroe <june@causal.agency>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * Additional permission under GNU GPL version 3 section 7:
+ *
+ * If you modify this Program, or any covered work, by linking or
+ * combining it with OpenSSL (or a modified version of that library),
+ * containing parts covered by the terms of the OpenSSL License and the
+ * original SSLeay license, the licensors of this Program grant you
+ * additional permission to convey the resulting work. Corresponding
+ * Source for a non-source form of such a combination shall include the
+ * source code for the parts of OpenSSL used as well as that of the
+ * covered work.
+ */
+
+#include <assert.h>
+#include <err.h>
+#include <limits.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+#include <tls.h>
+#include <unistd.h>
+
+char *configPath(char *buf, size_t cap, const char *path, int i);
+FILE *configOpen(const char *path, const char *mode);
+
+#define WS "\t "
+
+#define ARRAY_LEN(a) (sizeof(a) / sizeof((a)[0]))
+
+struct Option {
+	bool set;
+	char *name;
+	char *value;
+};
+
+struct Config {
+	size_t cap, len;
+	struct Option *opts;
+};
+
+static struct Config inherit;
+static struct Config own;
+static FILE *config;
+
+static struct Option configGet(const struct Config *config, const char *name) {
+	for (size_t i = 0; i < config->len; ++i) {
+		if (!strcmp(config->opts[i].name, name)) return config->opts[i];
+	}
+	return (struct Option) { .set = false };
+}
+
+static void
+configSet(struct Config *config, const char *name, const char *value) {
+	for (size_t i = 0; i < config->len; ++i) {
+		struct Option *opt = &config->opts[i];
+		if (strcmp(opt->name, name)) continue;
+
+		opt->set = true;
+		free(opt->value);
+		opt->value = NULL;
+		if (value) {
+			opt->value = strdup(value);
+			if (!opt->value) err(EX_OSERR, "strdup");
+		}
+		return;
+	}
+
+	if (config->len == config->cap) {
+		config->cap = (config->cap ? config->cap * 2 : 32);
+		config->opts = realloc(
+			config->opts, config->cap * sizeof(*config->opts)
+		);
+		if (!config->opts) err(EX_OSERR, "realloc");
+	}
+
+	struct Option *opt = &config->opts[config->len++];
+	opt->set = true;
+	opt->name = strdup(name);
+	if (!opt->name) err(EX_OSERR, "strdup");
+
+	opt->value = NULL;
+	if (value) {
+		opt->value = strdup(value);
+		if (!opt->value) err(EX_OSERR, "strdup");
+	}
+}
+
+static void configUnset(struct Config *config, const char *name) {
+	for (size_t i = 0; i < config->len; ++i) {
+		if (strcmp(config->opts[i].name, name)) continue;
+		config->opts[i].set = false;
+		break;
+	}
+}
+
+static void configWrite(const struct Config *config, FILE *file) {
+	int error = ftruncate(fileno(file), 0);
+	if (error) err(EX_IOERR, "ftruncate");
+
+	rewind(file);
+	fprintf(file, "# written by pounce-edit\n");
+	for (size_t i = 0; i < config->len; ++i) {
+		if (!config->opts[i].set) continue;
+		fprintf(file, "%s", config->opts[i].name);
+		if (config->opts[i].value) {
+			fprintf(file, " = %s", config->opts[i].value);
+		}
+		fprintf(file, "\n");
+		if (ferror(file)) err(EX_IOERR, "writing configuration");
+	}
+
+	error = fflush(file);
+	if (error) err(EX_IOERR, "writing configuration");
+}
+
+static void configParse(struct Config *config, const char *path) {
+	FILE *file = configOpen(path, "r");
+	if (!file) exit(EX_NOINPUT);
+
+	ssize_t llen;
+	size_t cap = 0;
+	char *buf = NULL;
+	for (size_t line = 1; 0 < (llen = getline(&buf, &cap, file)); ++line) {
+		if (buf[llen-1] == '\n') buf[--llen] = '\0';
+
+		char *name = buf + strspn(buf, WS);
+		size_t len = strcspn(name, WS "=");
+		if (!name[0] || name[0] == '#') continue;
+
+		char *equal = &name[len] + strspn(&name[len], WS);
+		if (*equal && *equal != '=') {
+			name[len] = '\0';
+			errx(
+				EX_USAGE, "%s:%zu: option `%s' missing equals sign",
+				path, line, name
+			);
+		}
+
+		char *value = NULL;
+		if (*equal) {
+			value = &equal[1] + strspn(&equal[1], WS);
+		}
+
+		name[len] = '\0';
+		configSet(config, name, value);
+	}
+	fclose(file);
+}
+
+static bool verbose;
+static struct tls *client;
+
+static void clientWrite(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 format(const char *format, ...)
+__attribute__((format(printf, 1, 2)));
+static void format(const char *format, ...) {
+	char buf[1024];
+	va_list ap;
+	va_start(ap, format);
+	int len = vsnprintf(buf, sizeof(buf), format, ap);
+	va_end(ap);
+	assert((size_t)len < sizeof(buf));
+	if (verbose) fprintf(stderr, "%s", buf);
+	clientWrite(buf, len);
+}
+
+enum { ParamCap = 2 };
+struct Message {
+	char *nick;
+	char *cmd;
+	char *params[ParamCap];
+};
+
+static struct Message parse(char *line) {
+	if (verbose) fprintf(stderr, "%s\n", line);
+	struct Message msg = {0};
+	if (line[0] == ':') {
+		char *origin = 1 + strsep(&line, " ");
+		msg.nick = strsep(&origin, "!");
+	}
+	msg.cmd = strsep(&line, " ");
+	for (size_t i = 0; line && i < ParamCap; ++i) {
+		if (line[0] == ':') {
+			msg.params[i] = &line[1];
+			break;
+		}
+		msg.params[i] = strsep(&line, " ");
+	}
+	return msg;
+}
+
+static void require(const struct Message *msg, bool nick, size_t len) {
+	if (nick && !msg->nick) errx(EX_PROTOCOL, "%s missing origin", msg->cmd);
+	for (size_t i = 0; i < len; ++i) {
+		if (msg->params[i]) continue;
+		errx(EX_PROTOCOL, "%s missing parameter %zu", msg->cmd, 1 + i);
+	}
+}
+
+typedef void Handler(struct Message *msg);
+
+static void handlePing(struct Message *msg) {
+	require(msg, false, 1);
+	format("PONG :%s\r\n", msg->params[0]);
+}
+
+static void handleError(struct Message *msg) {
+	require(msg, false, 1);
+	errx(EX_UNAVAILABLE, "%s", msg->params[0]);
+}
+
+static void handlePrivmsg(struct Message *msg) {
+	require(msg, true, 2);
+	if (strcmp(msg->nick, msg->params[0])) return;
+
+	char *cmd = strsep(&msg->params[1], " ");
+	char *name = strsep(&msg->params[1], " ");
+	char *value = msg->params[1];
+
+	if (!strcmp(cmd, "get")) {
+		if (!name) {
+			format("NOTICE %s :", msg->nick);
+			bool some = false;
+			for (size_t i = 0; i < own.len; ++i) {
+				if (!own.opts[i].set) continue;
+				format("%s\2%s\2", (i ? " " : ""), own.opts[i].name);
+				some = true;
+			}
+			format("%s\r\n", (some ? "" : "none set"));
+			return;
+		}
+
+		struct Option opt = configGet(&own, name);
+		if (!opt.set) opt = configGet(&inherit, name);
+		if (opt.set && opt.value) {
+			format("NOTICE %s :\2%s\2 = %s\r\n", msg->nick, name, opt.value);
+		} else if (opt.set) {
+			format("NOTICE %s :\2%s\2 is set\r\n", msg->nick, name);
+		} else {
+			format("NOTICE %s :\2%s\2 unset\r\n", msg->nick, name);
+		}
+
+	} else if (!strcmp(cmd, "set")) {
+		if (!name) {
+			format(
+				"NOTICE %s :\2set\2 \35option\35 [\35value\35]\r\n",
+				msg->nick
+			);
+			return;
+		}
+		configSet(&own, name, value);
+		configWrite(&own, config);
+		format("NOTICE %s :\2%s\2 set\r\n", msg->nick, name);
+
+	} else if (!strcmp(cmd, "unset")) {
+		if (!name) {
+			format("NOTICE %s :\2unset\2 \35option\35\r\n", msg->nick);
+			return;
+		}
+		configUnset(&own, name);
+		configWrite(&own, config);
+		struct Option opt = configGet(&inherit, name);
+		format(
+			"NOTICE %s :\2%s\2 %s\r\n",
+			msg->nick, name, (opt.set ? "inherited" : "unset")
+		);
+
+	} else if (!strcmp(cmd, "restart")) {
+		format("QUIT :pounce reloading configuration\r\n");
+	}
+}
+
+static const struct {
+	const char *cmd;
+	Handler *fn;
+} Handlers[] = {
+	{ "ERROR", handleError },
+	{ "PING", handlePing },
+	{ "PRIVMSG", handlePrivmsg },
+};
+
+static void handle(struct Message *msg) {
+	if (!msg->cmd) return;
+	for (size_t i = 0; i < ARRAY_LEN(Handlers); ++i) {
+		if (strcmp(msg->cmd, Handlers[i].cmd)) continue;
+		Handlers[i].fn(msg);
+		break;
+	}
+}
+
+static void quit(int sig) {
+	(void)sig;
+	format("QUIT\r\n");
+	tls_close(client);
+	_exit(EX_OK);
+}
+
+int main(int argc, char *argv[]) {
+	bool insecure = false;
+	const char *cert = NULL;
+	const char *priv = NULL;
+	const char *host = NULL;
+	const char *port = NULL;
+	const char *pass = NULL;
+	const char *trust = NULL;
+	const char *user = "pounce-edit";
+
+	for (int opt; 0 < (opt = getopt(argc, argv, "!c:h:k:p:t:u:vw:"));) {
+		switch (opt) {
+			break; case '!': insecure = true;
+			break; case 'c': cert = optarg;
+			break; case 'h': host = optarg;
+			break; case 'k': priv = optarg;
+			break; case 'p': port = optarg;
+			break; case 't': trust = optarg;
+			break; case 'u': user = optarg;
+			break; case 'v': verbose = true;
+			break; case 'w': pass = optarg;
+			break; default:  return EX_USAGE;
+		}
+	}
+	if (optind == argc) errx(EX_USAGE, "config required");
+
+	for (int i = optind; i < argc-1; ++i) {
+		configParse(&inherit, argv[i]);
+	}
+	configParse(&own, argv[argc-1]);
+	config = configOpen(argv[argc-1], "r+");
+	if (!config) exit(EX_NOINPUT);
+
+	if (!host) {
+		struct Option opt = configGet(&own, "local-host");
+		if (!opt.set) opt = configGet(&inherit, "local-host");
+		if (!opt.set || !opt.value) errx(EX_USAGE, "host required");
+		host = opt.value;
+	}
+	if (!port) {
+		struct Option opt = configGet(&own, "local-port");
+		if (!opt.set) opt = configGet(&inherit, "local-port");
+		if (opt.set && opt.value) {
+			port = opt.value;
+		} else {
+			port = "6697";
+		}
+	}
+
+	client = tls_client();
+	if (!client) errx(EX_SOFTWARE, "tls_client");
+
+	struct tls_config *config = tls_config_new();
+	if (!config) errx(EX_SOFTWARE, "tls_config_new");
+
+	if (insecure) {
+		tls_config_insecure_noverifycert(config);
+		tls_config_insecure_noverifyname(config);
+	}
+
+	int error;
+	char path[PATH_MAX];
+	if (trust) {
+		tls_config_insecure_noverifyname(config);
+		for (int i = 0; configPath(path, sizeof(path), trust, i); ++i) {
+			error = tls_config_set_ca_file(config, path);
+			if (!error) break;
+		}
+		if (error) errx(EX_NOINPUT, "%s: %s", trust, tls_config_error(config));
+	}
+	if (cert) {
+		for (int i = 0; configPath(path, sizeof(path), cert, i); ++i) {
+			if (priv) {
+				error = tls_config_set_cert_file(config, path);
+			} else {
+				error = tls_config_set_keypair_file(config, path, path);
+			}
+			if (!error) break;
+		}
+		if (error) errx(EX_NOINPUT, "%s: %s", cert, tls_config_error(config));
+	}
+	if (priv) {
+		for (int i = 0; configPath(path, sizeof(path), priv, i); ++i) {
+			error = tls_config_set_key_file(config, path);
+			if (!error) break;
+		}
+		if (error) errx(EX_NOINPUT, "%s: %s", priv, tls_config_error(config));
+	}
+
+	error = tls_configure(client, config);
+	if (error) errx(EX_SOFTWARE, "tls_configure: %s", tls_error(client));
+	tls_config_free(config);
+
+	error = tls_connect(client, host, port);
+	if (error) errx(EX_UNAVAILABLE, "tls_connect: %s", tls_error(client));
+
+	if (pass) format("PASS :%s\r\n", pass);
+	format(
+		"CAP REQ :causal.agency/passive\r\n"
+		"CAP END\r\n"
+		"NICK *\r\n"
+		"USER %s 0 * :pounce-edit\r\n",
+		user
+	);
+
+	signal(SIGINT, quit);
+	signal(SIGTERM, quit);
+
+	size_t len = 0;
+	char buf[8191 + 512];
+	for (;;) {
+		ssize_t ret = tls_read(client, &buf[len], sizeof(buf) - len);
+		if (ret == TLS_WANT_POLLIN || ret == TLS_WANT_POLLOUT) continue;
+		if (ret < 0) errx(EX_IOERR, "tls_read: %s", tls_error(client));
+		if (!ret) errx(EX_PROTOCOL, "server closed connection");
+		len += ret;
+
+		char *line = buf;
+		for (;;) {
+			char *crlf = memmem(line, &buf[len] - line, "\r\n", 2);
+			if (!crlf) break;
+			*crlf = '\0';
+			struct Message msg = parse(line);
+			handle(&msg);
+			line = crlf + 2;
+		}
+		len -= line - buf;
+		memmove(buf, line, len);
+	}
+}