lib: Add Common Application Connection Establishment Phase

This adds CACEP to the library, which can be used for authenticating
the other party after flow allocation and for obtaining other relevant
information.

1 files changed, 170 insertions, 0 deletions

diff --git a/src/lib/cacep.c b/src/lib/cacep.c
new file mode 100644
index 00000000..90994c04
--- /dev/null
+++ b/src/lib/cacep.c
@@ -0,0 +1,170 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * The Common Application Connection Establishment Phase
+ *
+ *    Sander Vrijders <sander.vrijders@intec.ugent.be>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <ouroboros/config.h>
+#include <ouroboros/cacep.h>
+#include <ouroboros/dev.h>
+#include <ouroboros/errno.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "cacep.pb-c.h"
+typedef Cacep cacep_t;
+
+#define BUF_SIZE 2048
+
+struct cacep {
+        int      fd;
+        char *   name;
+        uint64_t address;
+};
+
+struct cacep * cacep_create(int      fd,
+                            char *   name,
+                            uint64_t address)
+{
+        struct cacep * tmp;
+
+        tmp = malloc(sizeof(*tmp));
+        if (tmp == NULL)
+                return NULL;
+
+        tmp->fd = fd;
+        tmp->address = address;
+        tmp->name = strdup(name);
+        if (tmp->name == NULL) {
+                free(tmp);
+                return NULL;
+        }
+
+        return tmp;
+}
+
+int cacep_destroy(struct cacep * instance)
+{
+        if (instance == NULL)
+                return 0;
+
+        free(instance);
+
+        return 0;
+}
+
+static struct cacep_info * read_msg(struct cacep * instance)
+{
+        struct cacep_info * tmp;
+        uint8_t             buf[BUF_SIZE];
+        cacep_t *           msg;
+        ssize_t             len;
+
+        len = flow_read(instance->fd, buf, BUF_SIZE);
+        if (len < 0)
+                return NULL;
+
+        msg = cacep__unpack(NULL, len, buf);
+        if (msg == NULL)
+                return NULL;
+
+        tmp = malloc(sizeof(*tmp));
+        if (tmp == NULL) {
+                cacep__free_unpacked(msg, NULL);
+                return NULL;
+        }
+
+        tmp->addr = msg->address;
+        tmp->name = strdup(msg->name);
+        if (tmp->name == NULL) {
+                free(tmp);
+                cacep__free_unpacked(msg, NULL);
+                return NULL;
+        }
+
+        cacep__free_unpacked(msg, NULL);
+
+        return tmp;
+}
+
+static int send_msg(struct cacep * instance)
+{
+        cacep_t   msg = CACEP__INIT;
+        int       ret = 0;
+        uint8_t * data = NULL;
+        size_t    len = 0;
+
+        msg.name = instance->name;
+        msg.address = instance->address;
+
+        len = cacep__get_packed_size(&msg);
+        if (len == 0)
+                return -1;
+
+        data = malloc(len);
+        if (data == NULL)
+                return -ENOMEM;
+
+        cacep__pack(&msg, data);
+
+        if (flow_write(instance->fd, data, len) < 0)
+                ret = -1;
+
+        free(data);
+
+        return ret;
+}
+
+struct cacep_info * cacep_auth(struct cacep * instance)
+{
+        struct cacep_info * tmp;
+
+        if (instance == NULL)
+                return NULL;
+
+        if (send_msg(instance))
+                return NULL;
+
+        tmp = read_msg(instance);
+        if (tmp == NULL)
+                return NULL;
+
+        return tmp;
+}
+
+struct cacep_info * cacep_auth_wait(struct cacep * instance)
+{
+        struct cacep_info * tmp;
+
+        if (instance == NULL)
+                return NULL;
+
+        tmp = read_msg(instance);
+        if (tmp == NULL)
+                return NULL;
+
+        if (send_msg(instance)) {
+                free(tmp->name);
+                free(tmp);
+                return NULL;
+        }
+
+        return tmp;
+}