1 files changed, 134 insertions, 0 deletions
diff --git a/loop.c b/loop.c
new file mode 100644
index 0000000..ba14a4d
--- /dev/null
+++ b/loop.c
@@ -0,0 +1,134 @@
+/*
+ * 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 <poll.h>
+#include <signal.h>
+#include <unistd.h>
+
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+
+struct Peer peers[PEERS_MAX];
+static struct pollfd pfd[PEERS_MAX + 1];
+static size_t remove_schedule[PEERS_MAX];
+
+const char *host;
+int port;
+
+void
+ircd(void)
+{
+	size_t i, schedulei, connected, pid;
+	struct sockaddr_in addr, clientaddr;
+	int res, sfd, client;
+	nfds_t passed;
+	ssize_t recvd;
+
+	addr.sin_family = PF_INET;
+	addr.sin_port = htons(port);
+
+	res = inet_pton(AF_INET, host, &addr.sin_addr);
+	if (res == -1)
+		err(1, "inet_pton()");
+
+	sfd = socket(AF_INET, SOCK_STREAM, 0);
+	if (sfd == -1)
+		err(1, "socket()");
+
+	res = setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &(int){1}, sizeof(int));
+	if (res == -1)
+		err(1, "setsockopt(SO_REUSEADDR)");
+
+	res = bind(sfd, (void *)&addr, sizeof(addr));
+	if (res == -1)
+		err(1, "bind()");
+
+	res = listen(sfd, 128);
+	if (res == -1)
+		err(1, "listen()");
+
+	signal(SIGPIPE, SIG_IGN);
+	for (connected = 0;;schedulei = 0)
+	{
+		pfd[connected] = (struct pollfd){ .fd = sfd, .events = POLLIN };
+		for (i = 0; i < connected; ++i)
+			pfd[i] = (struct pollfd)
+			{
+				.fd = peers[i].fd,
+				.events = POLLIN,
+			};
+		res = poll(pfd, (passed = connected) + 1, -1);
+		if (res == -1)
+			err(1, "poll()");
+
+		if (pfd[connected].revents & POLLIN)
+		{
+			client = accept(sfd, (void *)&clientaddr, &(int){sizeof(clientaddr)});
+			if (client == -1)
+			{
+				warn("accept(sfd)");
+			}
+			else if (connected == PEERS_MAX)
+			{
+				/*
+				 * TODO: maybe send 005 or smth?
+				 */
+				close(client);
+			}
+			else
+			{
+				peers[connected++] = (struct Peer){ .fd = client };
+				strlcpy(
+					peers[connected - 1].host,
+					inet_ntoa(clientaddr.sin_addr),
+					sizeof(peers->host)
+				);
+			}
+		}
+
+		for (i = 0; i < passed; ++i)
+		{
+			if (!(pfd[i].revents & POLLIN))
+				continue;
+
+			recvd = read(
+				peers[i].fd,
+				peers[i].buf + peers[i].recvd,
+				sizeof(peers[i].buf) - peers[i].recvd
+			);
+			peers[i].recvd += recvd;
+			if (recvd == -1 || !recvd || handle(&peers[i]))
+				remove_schedule[schedulei++] = i;
+		}
+		for (i = 0; i < schedulei; ++i)
+		{
+			pid = remove_schedule[i];
+			/* TODO: announce_quit(&peers[pid]); */
+			writef(peers[pid].fd, "ERROR :Closing Link: %s", peers[pid].host);
+			close(peers[pid].fd);
+			peers[pid] = peers[--connected];
+		}
+		schedulei = 0;
+	}
+}