lib: Revise CACEP

Revises CACEP policies to stateless library calls. It provides two
policies: an anonymous authentication policy that will generate random
credentials for the peer, and a simple authentication policy that will
return a name for the peer and an address.

Changes the normal IPCP to use the updates API calls.

7 files changed, 327 insertions, 139 deletions

diff --git a/src/lib/CMakeLists.txt b/src/lib/CMakeLists.txt
index 6af50782..f823b2d1 100644
--- a/src/lib/CMakeLists.txt
+++ b/src/lib/CMakeLists.txt
@@ -9,8 +9,9 @@ protobuf_generate_c(IPCP_PROTO_SRCS IPCP_PROTO_HDRS ipcpd_messages.proto)
 protobuf_generate_c(DIF_CONFIG_PROTO_SRCS DIF_CONFIG_PROTO_HDRS
   dif_config.proto)
 protobuf_generate_c(CDAP_PROTO_SRCS CDAP_PROTO_HDRS cdap.proto)
-protobuf_generate_c(CACEP_PROTO_SRCS CACEP_PROTO_HDRS cacep.proto)
 protobuf_generate_c(RO_PROTO_SRCS RO_PROTO_HDRS ro.proto)
+protobuf_generate_c(CACEP_SIMPLE_AUTH_PROTO_SRCS CACEP_SIMPLE_AUTH_PROTO_HDRS
+  pol/cacep_simple_auth.proto)
 
 if(NOT APPLE)
   find_library(LIBRT_LIBRARIES rt)
@@ -49,11 +50,14 @@ set(SOURCE_FILES
   sockets.c
   time_utils.c
   utils.c
+  # Add policies last
+  pol/cacep_anonymous_auth.c
+  pol/cacep_simple_auth.c
   )
 
 add_library(ouroboros SHARED ${SOURCE_FILES} ${IRM_PROTO_SRCS}
-  ${IPCP_PROTO_SRCS} ${DIF_CONFIG_PROTO_SRCS}
-  ${CDAP_PROTO_SRCS} ${CACEP_PROTO_SRCS} ${RO_PROTO_SRCS})
+  ${IPCP_PROTO_SRCS} ${DIF_CONFIG_PROTO_SRCS} ${CDAP_PROTO_SRCS}
+  ${CACEP_SIMPLE_AUTH_PROTO_SRCS} ${RO_PROTO_SRCS})
 
 target_link_libraries(ouroboros ${LIBRT_LIBRARIES}
   ${LIBPTHREAD_LIBRARIES} ${PROTOBUF_C_LIBRARY})
diff --git a/src/lib/cacep.c b/src/lib/cacep.c
index 00557444..3d556d8f 100644
--- a/src/lib/cacep.c
+++ b/src/lib/cacep.c
@@ -20,152 +20,52 @@
  * 02110-1301 USA
  */
 
+#define OUROBOROS_PREFIX "cacep"
+
 #include <ouroboros/config.h>
 #include <ouroboros/cacep.h>
 #include <ouroboros/dev.h>
 #include <ouroboros/errno.h>
+#include <ouroboros/logs.h>
+
+#include <pol/cacep_anonymous_auth.h>
+#include <pol/cacep_simple_auth.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,
-                            const char * name,
-                            uint64_t     address)
+struct cacep_info * cacep_auth(int                       fd,
+                               enum pol_cacep            pc,
+                               const struct cacep_info * info)
 {
-        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);
+        switch (pc) {
+        case ANONYMOUS_AUTH:
+                return cacep_anonymous_auth(fd, info);
+        case SIMPLE_AUTH:
+                if (info == NULL)
+                        return NULL;
+                return cacep_simple_auth_auth(fd, info);
+        default:
+                log_err("Unsupported CACEP policy.");
                 return NULL;
         }
-
-        return tmp;
-}
-
-int cacep_destroy(struct cacep * instance)
-{
-        if (instance == NULL)
-                return 0;
-
-        free(instance->name);
-        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 * cacep_auth_wait(int                       fd,
+                                    enum pol_cacep            pc,
+                                    const struct cacep_info * info)
 {
-        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);
+        switch (pc) {
+        case ANONYMOUS_AUTH:
+                 return cacep_anonymous_auth_wait(fd, info);
+        case SIMPLE_AUTH:
+                if (info == NULL)
+                        return NULL;
+                return cacep_simple_auth_auth_wait(fd, info);
+        default:
+                log_err("Unsupported CACEP policy.");
                 return NULL;
         }
-
-        return tmp;
 }
diff --git a/src/lib/pol/cacep_anonymous_auth.c b/src/lib/pol/cacep_anonymous_auth.c
new file mode 100644
index 00000000..d450fdc5
--- /dev/null
+++ b/src/lib/pol/cacep_anonymous_auth.c
@@ -0,0 +1,81 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * Anonymous policy for CACEP
+ *
+ *    Dimitri Staessens <dimitri.staessens@ugent.be>
+ *    Sander Vrijders   <sander.vrijders@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/time_utils.h>
+
+#include "cacep_anonymous_auth.h"
+
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+#include <stdio.h>
+
+#define NAME_LEN 8
+
+/* this policy generates a hex string */
+static struct cacep_info * anonymous_info(void)
+{
+        struct cacep_info * info;
+        struct timespec t;
+
+        info = malloc(sizeof(*info));
+        if (info == NULL)
+                return NULL;
+
+        info->name = malloc(NAME_LEN + 1);
+        if (info->name == NULL) {
+                free(info);
+                return NULL;
+        }
+
+        clock_gettime(CLOCK_REALTIME, &t);
+        srand(t.tv_nsec);
+
+        sprintf(info->name, "%8x",
+                (uint32_t)((rand() % RAND_MAX) & 0xFFFFFFFF));
+
+        info->addr = 0;
+
+        return info;
+}
+
+struct cacep_info * cacep_anonymous_auth(int                       fd,
+                                         const struct cacep_info * info)
+{
+        (void) fd;
+        (void) info;
+
+        return anonymous_info();
+}
+
+
+struct cacep_info * cacep_anonymous_auth_wait(int                       fd,
+                                              const struct cacep_info * info)
+{
+        (void) fd;
+        (void) info;
+
+        return anonymous_info();
+}
diff --git a/src/lib/pol/cacep_anonymous_auth.h b/src/lib/pol/cacep_anonymous_auth.h
new file mode 100644
index 00000000..d0229b05
--- /dev/null
+++ b/src/lib/pol/cacep_anonymous_auth.h
@@ -0,0 +1,33 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * Anonymous policy for CACEP
+ *
+ *    Dimitri Staessens <dimitri.staessens@ugent.be>
+ *    Sander Vrijders   <sander.vrijders@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
+ */
+
+#ifndef OUROBOROS_LIB_CACEP_ANONYMOUS_AUTH_H
+#define OUROBOROS_LIB_CACEP_ANONYMOUS_AUTH_H
+
+struct cacep_info * cacep_anonymous_auth(int                       fd,
+                                         const struct cacep_info * info);
+
+struct cacep_info * cacep_anonymous_auth_wait(int                       fd,
+                                              const struct cacep_info * info);
+
+#endif /* OUROBOROS_LIB_CACEP_ANONYMOUS_AUTH_H */
diff --git a/src/lib/pol/cacep_simple_auth.c b/src/lib/pol/cacep_simple_auth.c
new file mode 100644
index 00000000..1e052f3d
--- /dev/null
+++ b/src/lib/pol/cacep_simple_auth.c
@@ -0,0 +1,137 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * Simple authentication policy for CACEP
+ *
+ *    Dimitri Staessens <dimitri.staessens@ugent.be>
+ *    Sander Vrijders   <sander.vrijders@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 "cacep_simple_auth.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "cacep_simple_auth.pb-c.h"
+typedef CacepSimpleAuthMsg cacep_simple_auth_msg_t;
+
+#define BUF_SIZE 2048
+
+static struct cacep_info * read_msg(int fd)
+{
+        struct cacep_info *       tmp;
+        uint8_t                   buf[BUF_SIZE];
+        cacep_simple_auth_msg_t * msg;
+        ssize_t                   len;
+
+        len = flow_read(fd, buf, BUF_SIZE);
+        if (len < 0)
+                return NULL;
+
+        msg = cacep_simple_auth_msg__unpack(NULL, len, buf);
+        if (msg == NULL)
+                return NULL;
+
+        tmp = malloc(sizeof(*tmp));
+        if (tmp == NULL) {
+                cacep_simple_auth_msg__free_unpacked(msg, NULL);
+                return NULL;
+        }
+
+        tmp->addr = msg->addr;
+        tmp->name = strdup(msg->name);
+        if (tmp->name == NULL) {
+                free(tmp);
+                cacep_simple_auth_msg__free_unpacked(msg, NULL);
+                return NULL;
+        }
+
+        cacep_simple_auth_msg__free_unpacked(msg, NULL);
+
+        return tmp;
+}
+
+static int send_msg(int                       fd,
+                    const struct cacep_info * info)
+{
+        cacep_simple_auth_msg_t msg = CACEP_SIMPLE_AUTH_MSG__INIT;
+        int                     ret = 0;
+        uint8_t *               data = NULL;
+        size_t                  len = 0;
+
+        msg.name = info->name;
+        msg.addr = info->addr;
+
+        len = cacep_simple_auth_msg__get_packed_size(&msg);
+        if (len == 0)
+                return -1;
+
+        data = malloc(len);
+        if (data == NULL)
+                return -ENOMEM;
+
+        cacep_simple_auth_msg__pack(&msg, data);
+
+        if (flow_write(fd, data, len) < 0)
+                ret = -1;
+
+        free(data);
+
+        return ret;
+}
+
+struct cacep_info * cacep_simple_auth_auth(int                       fd,
+                                           const struct cacep_info * info)
+{
+        struct cacep_info * tmp;
+
+        assert(info);
+
+        if (send_msg(fd, info))
+                return NULL;
+
+        tmp = read_msg(fd);
+        if (tmp == NULL)
+                return NULL;
+
+        return tmp;
+}
+
+
+struct cacep_info * cacep_simple_auth_auth_wait(int                       fd,
+                                                const struct cacep_info * info)
+{
+        struct cacep_info * tmp;
+
+        assert(info);
+
+        tmp = read_msg(fd);
+        if (tmp == NULL)
+                return NULL;
+
+        if (send_msg(fd, info)) {
+                free(tmp);
+                return NULL;
+        }
+
+        return tmp;
+}
diff --git a/src/lib/pol/cacep_simple_auth.h b/src/lib/pol/cacep_simple_auth.h
new file mode 100644
index 00000000..bbdbe9b9
--- /dev/null
+++ b/src/lib/pol/cacep_simple_auth.h
@@ -0,0 +1,33 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * Simple authentication policy for CACEP
+ *
+ *    Dimitri Staessens <dimitri.staessens@ugent.be>
+ *    Sander Vrijders   <sander.vrijders@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
+ */
+
+#ifndef OUROBOROS_LIB_CACEP_SIMPLE_AUTH_H
+#define OUROBOROS_LIB_CACEP_SIMPLE_AUTH_H
+
+struct cacep_info * cacep_simple_auth_auth(int                       fd,
+                                           const struct cacep_info * info);
+
+struct cacep_info * cacep_simple_auth_auth_wait(int                       fd,
+                                                const struct cacep_info * info);
+
+#endif /* OUROBOROS_LIB_CACEP_SIMPLE_AUTH_H */
diff --git a/src/lib/cacep.proto b/src/lib/pol/cacep_simple_auth.proto
index 603b095d..d20f8780 100644
--- a/src/lib/cacep.proto
+++ b/src/lib/pol/cacep_simple_auth.proto
@@ -1,10 +1,10 @@
 /*
  * Ouroboros - Copyright (C) 2016 - 2017
  *
- * CACEP message
+ * Message for no authentication CACEP policy
  *
- *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
- *    Sander Vrijders   <sander.vrijders@intec.ugent.be>
+ *    Dimitri Staessens <dimitri.staessens@ugent.be>
+ *    Sander Vrijders   <sander.vrijders@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
@@ -23,7 +23,7 @@
 
 syntax = "proto2";
 
-message cacep {
-        required string name    = 1;
-        required uint64 address = 2;
+message cacep_simple_auth_msg {
+        required string name = 1;
+        required uint64 addr = 2;
 }