From a67f97b904c64b21381347299d095006f48e8bce Mon Sep 17 00:00:00 2001
From: Danny Holman <dholman@gymli.org>
Date: Wed, 4 Jan 2023 00:39:25 -0600
Subject: server: add functions for session management

Add functions to initialize and control individual sessions.

Signed-off-by: Danny Holman <dholman@gymli.org>
---
 server/include/session.h | 17 +++++++++++++++++
 server/src/session.c     | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)
 create mode 100644 server/include/session.h
 create mode 100644 server/src/session.c

diff --git a/server/include/session.h b/server/include/session.h
new file mode 100644
index 0000000..2de8293
--- /dev/null
+++ b/server/include/session.h
@@ -0,0 +1,17 @@
+#ifndef MRAT_SESSION_H
+#define MRAT_SESSION_H
+
+#include "list.h"
+
+struct session {
+        int id;
+        int socket;
+        struct list_head list;
+};
+
+int init_session(int socket);
+struct session* find_session(int id);
+void write_session(int id, const char *data, size_t size);
+size_t read_session(int id, char *data, size_t size);
+
+#endif
diff --git a/server/src/session.c b/server/src/session.c
new file mode 100644
index 0000000..b2b760c
--- /dev/null
+++ b/server/src/session.c
@@ -0,0 +1,40 @@
+#include <session.h>
+#include <util.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdint.h>
+
+struct list_head sessions;
+uint16_t next_id = 1;
+
+int init_session(int socket) {
+        struct session *ses = malloc(sizeof(struct session));
+        ses->id = next_id;
+        next_id++;
+        ses->socket = socket;
+        list_add(&ses->list, &sessions);
+        return ses->id;
+}
+
+struct session* find_session(int id) {
+        struct list_head *temp = sessions.next;
+        struct session *ses = NULL;
+        while (temp != NULL) {
+                ses = (struct session*)container_of(temp, struct session, list);
+                if (ses->id == id)
+                        break;
+                temp = temp->next;
+        }
+        return ses;
+}
+
+void write_session(int id, const char *data, size_t size) {
+        struct session *ses = find_session(id);
+        write(ses->socket, data, size);
+}
+
+size_t read_session(int id, char *data, size_t size) {
+        struct session *ses = find_session(id);
+        size_t bytes = read(ses->socket, data, size);
+        return bytes;
+}
-- 
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