project: Introduce actual connections

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 97 insertions, 0 deletions

diff --git a/ostp.d/net/otd_param.c b/ostp.d/net/otd_param.c
new file mode 100644
index 0000000..fe33bd8
--- /dev/null
+++ b/ostp.d/net/otd_param.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <net/stpsession.h>
+#include <net/param.h>
+#include <crypto/aes.h>
+#include <otconfig.h>
+#include <defs.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+static int
+handle_pap(int client_fd, const struct pap *pap, const unsigned char *session_key)
+{
+    int error = 0;
+    uint8_t attempts = 0;
+    struct pap tmp_pap = *pap;
+    const size_t LEN = sizeof(struct pap);
+
+    /* TODO: Support more SPW bits */
+    while (1) {
+        /* Quick session request, jump right in! */
+        if (ISSET(tmp_pap.spw, PAP_SPW_QSR)) {
+            printf("Got QSR, starting session...\n");
+            send_frame(client_fd, &tmp_pap, LEN, session_key);
+            return 0;
+        }
+
+        /* We have exhausted our attempts */
+        if (attempts >= ARBITRATION_MAX) {
+            printf("Too many arbitration attempts, bailing!\n");
+            return -1;
+        }
+
+        printf("Got bad SPW from client\n");
+        printf("Attempting arbitration...\n");
+
+        tmp_pap.spw = 0x0;
+        tmp_pap.code = PAP_BAD_SPW;
+
+        /* Send in PAP and wait for response */
+        if ((error = send_frame(client_fd, &tmp_pap, LEN, session_key)) < 0) {
+            printf("Failed to send PAP frame\n");
+            return -1;
+        }
+        if ((error = recv_frame(client_fd, LEN, session_key, &tmp_pap)) < 0) {
+            printf("Failed to recv PAP frame\n");
+            return error;
+        }
+
+        ++attempts;
+    }
+
+    return 0;
+}
+
+int
+negotiate_spw(int client_fd, unsigned char *session_key)
+{
+    const size_t LEN = sizeof(struct pap);
+    struct pap pap;
+    int error;
+
+    /* Get PAP from the network */
+    if ((error = recv_frame(client_fd, LEN, session_key, &pap)) < 0) {
+        return error;
+    }
+
+    return handle_pap(client_fd, &pap, session_key);
+}