From ed8cb35c9ff4547275b03bd93baeff1cda3de76e Mon Sep 17 00:00:00 2001
From: David Härdeman <david@hardeman.nu>
Date: Sat, 6 Jun 2020 00:05:45 +0200
Subject: Add skeleton functionality for announcing servers

---
 announce.c | 178 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 announce.c

(limited to 'announce.c')

diff --git a/announce.c b/announce.c
new file mode 100644
index 0000000..8194f1c
--- /dev/null
+++ b/announce.c
@@ -0,0 +1,178 @@
+#include <inttypes.h>
+#include <sys/timerfd.h>
+#include <sys/socket.h>
+#include <netinet/ip.h>
+#include <arpa/inet.h>
+#include <string.h>
+
+#include "main.h"
+#include "uring.h"
+#include "config.h"
+#include "announce.h"
+
+struct announce {
+	uint64_t value;
+	struct uring_task task;
+	struct uring_task mcast_task;
+};
+
+static void
+mcast_free(struct uring_task *task)
+{
+	struct announce *aev = container_of(task, struct announce, mcast_task);
+
+	fprintf(stderr, "%s: called with task 0x%p and aev 0x%p\n", __func__, task, aev);
+}
+
+static void
+mcast_sent(struct cfg *cfg, struct uring_task *task, int res)
+{
+	fprintf(stderr, "%s: result %i\n", __func__, res);
+}
+
+static void
+mcast_send(struct cfg *cfg, struct announce *aev)
+{
+	struct sockaddr_in addr;
+	struct msghdr msg;
+	char buf[] = "[MOTD]fumbor - test[/MOTD][AD]1234[/AD]";
+	struct iovec iov = {
+		.iov_base = buf,
+		.iov_len  = sizeof(buf)
+	};
+
+	memset(&addr, 0, sizeof(addr));
+	addr.sin_family = AF_INET;
+	addr.sin_addr.s_addr = inet_addr("224.0.2.60");
+	addr.sin_port = htons(4445);
+
+	memset(&msg, 0, sizeof(msg));
+	msg.msg_name = &addr;
+	msg.msg_namelen = sizeof(addr);
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+	msg.msg_control = NULL;
+	msg.msg_controllen = 0;
+	msg.msg_flags = 0;
+
+	fprintf(stderr, "Manual: %zi\n", sendmsg(aev->mcast_task.fd, &msg, 0));
+	uring_sendmsg(cfg, &aev->mcast_task, &msg, mcast_sent);
+}
+
+static void
+announce_cb(struct cfg *cfg, struct uring_task *task, int res)
+{
+	struct announce *aev = container_of(task, struct announce, task);
+
+	fprintf(stderr, "%s: ret is %i (ref %u)\n", __func__, res, task->refcount);
+
+	if (task->dead) {
+		fprintf(stderr, "%s: task is dead\n", __func__);
+		uring_task_put(cfg, task);
+		return;
+	}
+
+	if (res != sizeof(aev->value))
+		perrordie("timerfd_read");
+
+	fprintf(stderr, "%s: called with value %" PRIu64 "\n", __func__, aev->value);
+	mcast_send(cfg, aev);
+	uring_read(cfg, &aev->task, &aev->value, sizeof(aev->value), 0, announce_cb);
+}
+
+static void
+announce_free(struct uring_task *task)
+{
+	struct announce *aev = container_of(task, struct announce, task);
+
+	fprintf(stderr, "%s: called with task 0x%p and aev 0x%p\n", __func__, task, aev);
+}
+
+void
+announce_refdump(struct announce *aev)
+{
+	if (!aev)
+		return;
+
+	uring_task_refdump(&aev->task);
+	uring_task_refdump(&aev->mcast_task);
+}
+
+void
+announce_delete(struct cfg *cfg)
+{
+	if (!cfg->aev) {
+		fprintf(stderr, "%s called with no announce!\n", __func__);
+		return;
+	}
+
+	fprintf(stderr, "%s called, closing fd %i\n", __func__, cfg->aev->task.fd);
+	uring_cancel(cfg, &cfg->aev->task);
+	cfg->aev = NULL;
+}
+
+void
+announce_stop(struct announce *aev)
+{
+	struct itimerspec tspec = {
+		.it_interval = {
+			.tv_sec  = 0,
+			.tv_nsec = 0
+		},
+		.it_value = {
+			.tv_sec  = 0,
+			.tv_nsec = 0
+		}
+	};
+
+	if (timerfd_settime(aev->task.fd, 0, &tspec, NULL) != 0)
+		perrordie("timerfd_settime");
+}
+
+void
+announce_start(struct announce *aev)
+{
+	struct itimerspec tspec = {
+		.it_interval = {
+			.tv_sec  = 3,
+			.tv_nsec = 0
+		},
+		.it_value = {
+			.tv_sec  = 3,
+			.tv_nsec = 0
+		}
+	};
+
+	if (timerfd_settime(aev->task.fd, 0, &tspec, NULL) != 0)
+		perrordie("timerfd_settime");
+}
+
+void
+announce_init(struct cfg *cfg)
+{
+	struct announce *aev;
+	int afd;
+	int sfd;
+ 
+	aev = zmalloc(sizeof(*aev));
+	if (!aev)
+		perrordie("malloc");
+
+	afd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
+	if (afd < 0)
+		perrordie("timerfd_create");
+
+	sfd = socket(AF_INET, SOCK_DGRAM, 0);
+	if (sfd < 0)
+		perrordie("socket");
+
+	uring_task_init(&aev->task, "aev", &cfg->task, announce_free);
+	uring_task_set_fd(&aev->task, afd);
+
+	uring_task_init(&aev->mcast_task, "aev_mcast", &aev->task, mcast_free);
+	uring_task_set_fd(&aev->mcast_task, sfd);
+
+	cfg->aev = aev;
+	uring_read(cfg, &aev->task, &aev->value, sizeof(aev->value), 0, announce_cb);
+}
+
-- 
cgit v1.2.3