Add WHOIS and config parsing

Now users can query each other

Plus, server info and creation date can be changed without recompiling
using configuration file in IRC message format which is loaded on
startup

TODO: since readcfg uses IRC logic, handle() now should be able to deal
with commands ending with simply \n

1 files changed, 73 insertions, 0 deletions

diff --git a/config.c b/config.c
new file mode 100644
index 0000000..9d945eb
--- /dev/null
+++ b/config.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2026 Nakidai Perumenei <nakidai at disroot dot org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "ircd.h"
+
+#include <string.h>
+
+#include <err.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <unistd.h>
+
+#include <sys/socket.h>
+#include <sys/types.h>
+
+char creation[CREATION_MAX] = CREATION_DATE;
+char info[INFO_MAX] = INFO;
+
+int
+readcfg(const char *path)
+{
+	struct Peer peer;
+	ssize_t recvd;
+	int fd, ret;
+
+	fd = open(path, O_RDONLY);
+	ensure(fd != -1, warn("open(%s)", path), 0);
+
+	peer = (struct Peer){
+		.fd = STDERR_FILENO,
+		.type = CONFIG,
+	};
+	strlcpy(peer.nick, path, sizeof(peer.nick));
+
+	for (ret = 0;;)
+	{
+		recvd = read(
+			fd,
+			peer.buf + peer.recvd,
+			sizeof(peer.buf) - peer.recvd
+		);
+		peer.recvd += recvd;
+		if (recvd == -1)
+		{
+			warn("read(%s)", path);
+			++ret;
+			goto end;
+		} else if (!recvd)
+		{
+			goto end;
+		} else if (handle(&peer))
+		{
+			++ret;
+			goto end;
+		}
+	}
+end:
+	close(fd);
+	return ret;
+}