ipcpd: initial IPC processes

Basic functions for implementation of IPC processes, and
implementation of core functions of the shim IPCP over UDP.  Updates
to the build system to compile these IPC processes, as well as some
fixes in the irmd (rudimentary capturing exit signals) and some fixes
in the library, mainly relating to the messaging.

Basic implementation of creation / bootstrapping / deletion of the
shim UDP. Placeholders for other functions.

4 files changed, 490 insertions, 0 deletions

diff --git a/src/ipcpd/shim-udp/CMakeLists.txt b/src/ipcpd/shim-udp/CMakeLists.txt
new file mode 100644
index 00000000..27907880
--- /dev/null
+++ b/src/ipcpd/shim-udp/CMakeLists.txt
@@ -0,0 +1,31 @@
+get_filename_component(CURRENT_SOURCE_PARENT_DIR ${CMAKE_CURRENT_SOURCE_DIR} DIRECTORY)
+get_filename_component(CURRENT_BINARY_PARENT_DIR ${CMAKE_CURRENT_BINARY_DIR} DIRECTORY)
+
+include_directories(${CMAKE_CURRENT_SOURCE_DIR})
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
+
+include_directories(${CURRENT_SOURCE_PARENT_DIR})
+include_directories(${CURRENT_BINARY_PARENT_DIR})
+
+include_directories(${CMAKE_SOURCE_DIR}/include)
+include_directories(${CMAKE_BINARY_DIR}/include)
+
+SET(IPCP_SHIM_UDP_TARGET ipcpd-shim-udp CACHE STRING "IPCP_SHIM_UDP_TARGET")
+
+set(SHIM_UDP_SOURCES
+        # Add source files here
+        ${CMAKE_CURRENT_SOURCE_DIR}/main.c
+)
+
+add_executable (ipcpd-shim-udp ${SHIM_UDP_SOURCES} ${IPCP_SOURCES})
+target_link_libraries (ipcpd-shim-udp LINK_PUBLIC ouroboros)
+
+include(MacroAddCompileFlags)
+if (CMAKE_BUILD_TYPE MATCHES Debug)
+   MACRO_ADD_COMPILE_FLAGS(ipcpd-shim-udp -DCONFIG_OUROBOROS_DEBUG)
+endif (CMAKE_BUILD_TYPE MATCHES Debug)
+
+install(TARGETS ipcpd-shim-udp RUNTIME DESTINATION bin)
+
+# Enable once ipcp-shim-udp has tests
+add_subdirectory(tests)
diff --git a/src/ipcpd/shim-udp/main.c b/src/ipcpd/shim-udp/main.c
new file mode 100644
index 00000000..1fb12dc0
--- /dev/null
+++ b/src/ipcpd/shim-udp/main.c
@@ -0,0 +1,323 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Shim IPC process over UDP
+ *
+ *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <ouroboros/config.h>
+
+#include "ipcp.h"
+#include <ouroboros/shm_du_map.h>
+#include <ouroboros/list.h>
+#include <ouroboros/flow.h>
+#include <ouroboros/utils.h>
+#include <ouroboros/ipcp.h>
+#include <ouroboros/dif_config.h>
+
+#define OUROBOROS_PREFIX "ipcpd/shim-udp"
+
+#include <ouroboros/logs.h>
+
+#include <string.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <pthread.h>
+
+#define THIS_TYPE IPCP_SHIM_UDP
+
+#define shim_data(type) ((struct ipcp_udp_data *) type->data)
+
+/* global for trapping signal */
+int irmd_pid;
+
+/* this IPCP's data */
+#ifdef MAKE_CHECK
+extern struct ipcp * _ipcp; /* defined in test */
+#else
+struct ipcp * _ipcp;
+#endif
+
+struct ipcp_udp_data {
+        /* IPCP_DATA STRUCT MUST BE FIRST!! */
+        struct ipcp_data ipcp_data;
+
+        uint32_t ip_addr;
+        uint32_t dns_addr;
+
+        pthread_mutex_t   lock;
+};
+
+struct udp_flow {
+        /* FLOW MUST BE FIRST !!!! */
+        flow_t flow;
+
+        uint16_t localport;
+
+        struct sockaddr_in * remote;
+        int    fd;
+};
+
+void ipcp_sig_handler(int sig, siginfo_t * info, void * c)
+{
+        switch(sig) {
+        case SIGINT:
+        case SIGTERM:
+        case SIGHUP:
+                LOG_DBG("Terminating by order of %d. Bye.", info->si_pid);
+                if (info->si_pid == irmd_pid) {
+                        shm_du_map_close(_ipcp->data->dum);
+                        exit(0);
+                }
+        default:
+                return;
+        }
+}
+
+struct ipcp_udp_data * ipcp_udp_data_create(char * ap_name,
+                                            char * ap_id)
+{
+        struct ipcp_udp_data * udp_data;
+        struct ipcp_data *     data;
+        instance_name_t *      instance_name;
+        enum ipcp_type         ipcp_type;
+
+        instance_name = instance_name_create();
+        if (instance_name  == NULL) {
+                LOG_ERR("Failed to create instance name struct.");
+                return NULL;
+        }
+
+        instance_name = instance_name_init_with(
+                instance_name, ap_name, (uint16_t)atoi(ap_id));
+
+        if (instance_name  == NULL) {
+                LOG_ERR("Failed to create instance name struct.");
+                return NULL;
+        }
+
+        udp_data= malloc (sizeof *udp_data);
+        if (udp_data == NULL) {
+                LOG_DBGF("Failed to allocate.");
+                return NULL;
+        }
+
+        ipcp_type = THIS_TYPE;
+        data = (struct ipcp_data *) udp_data;
+        if (ipcp_data_init(data, instance_name, ipcp_type) == NULL) {
+                free(udp_data);
+                return NULL;
+        }
+
+        return udp_data;
+}
+
+int ipcp_udp_bootstrap(struct dif_config * conf)
+{
+        char ipstr[INET_ADDRSTRLEN];
+        char dnsstr[INET_ADDRSTRLEN];
+
+        if (conf->type != THIS_TYPE) {
+                LOG_ERR("Config doesn't match IPCP type.");
+                return -1;
+        }
+
+        if (_ipcp->state != IPCP_INIT) {
+                LOG_ERR("IPCP in wrong state.");
+                return -1;
+        }
+
+        inet_ntop(AF_INET,
+                  &conf->ip_addr,
+                  ipstr,
+                  INET_ADDRSTRLEN);
+
+        if (conf->dns_addr != 0)
+                inet_ntop(AF_INET,
+                          &conf->dns_addr,
+                          dnsstr,
+                          INET_ADDRSTRLEN);
+        else
+                strcpy(dnsstr, "not set");
+
+        shim_data(_ipcp)->ip_addr  = conf->ip_addr;
+        shim_data(_ipcp)->dns_addr = conf->dns_addr;
+
+        _ipcp->state = IPCP_ENROLLED;
+
+        LOG_DBG("Bootstrapped shim IPCP over UDP %s-%d.",
+                _ipcp->data->iname->name, _ipcp->data->iname->id);
+
+        LOG_DBG("Bound to IP address %s.", ipstr);
+        LOG_DBG("DNS server address is %s.", dnsstr);
+
+        return 0;
+}
+
+int ipcp_udp_ap_reg(char * ap_name, uint32_t reg_ap_id)
+{
+        LOG_DBG("Registering local ap %s, %u.", ap_name, reg_ap_id);
+
+        if (_ipcp->state != IPCP_ENROLLED) {
+                LOG_DBGF("Won't register with non-enrolled IPCP.");
+                return -1;
+        }
+
+        if (ipcp_data_add_reg_entry(_ipcp->data, ap_name, reg_ap_id)) {
+                LOG_ERR("Failed to add AP to local registry.");
+                return -1;
+        }
+
+        LOG_MISSING;
+
+        return 0;
+}
+
+int ipcp_udp_ap_unreg(uint32_t reg_ap_id)
+{
+        char * name  = strdup(ipcp_data_get_reg_ap_name(_ipcp->data,
+                                                        reg_ap_id));
+        LOG_DBG("Unregistering %s.", name);
+
+        ipcp_data_del_reg_entry(_ipcp->data, reg_ap_id);
+
+        /* we are using dns */
+        LOG_MISSING;
+
+        free (name);
+
+        return 0;
+}
+
+int ipcp_udp_flow_alloc(uint32_t          port_id,
+                        char *            dst_ap_name,
+                        char *            src_ap_name,
+                        char *            src_ae_name,
+                        struct qos_spec * qos)
+{
+        return 0;
+}
+int ipcp_udp_flow_alloc_resp(uint32_t port_id,
+                             int      result)
+{
+        return 0;
+}
+
+int ipcp_udp_flow_dealloc(uint32_t port_id)
+{
+        return 0;
+}
+
+int ipcp_udp_du_write(uint32_t port_id,
+                      size_t map_index)
+{
+        return 0;
+}
+
+int ipcp_udp_du_read(uint32_t port_id,
+                     size_t map_index)
+{
+        return 0;
+}
+
+struct ipcp * ipcp_udp_create(char * ap_name, char * i_id)
+{
+        struct ipcp * i;
+        struct ipcp_udp_data * data;
+        struct ipcp_ops *      ops;
+
+        i = malloc(sizeof *i);
+        if (i == NULL)
+                return NULL;
+
+        data = ipcp_udp_data_create(ap_name, i_id);
+        if (data == NULL) {
+                free(i);
+                return NULL;
+        }
+
+        ops = malloc (sizeof *ops);
+        if (ops == NULL) {
+                free(data);
+                free(i);
+                return NULL;
+        }
+
+        ops->ipcp_bootstrap       = ipcp_udp_bootstrap;
+        ops->ipcp_enroll          = NULL;                       /* shim */
+        ops->ipcp_reg             = NULL;                       /* shim */
+        ops->ipcp_unreg           = NULL;                       /* shim */
+        ops->ipcp_ap_reg          = ipcp_udp_ap_reg;
+        ops->ipcp_ap_unreg        = ipcp_udp_ap_unreg;
+        ops->ipcp_flow_alloc      = ipcp_udp_flow_alloc;
+        ops->ipcp_flow_alloc_resp = ipcp_udp_flow_alloc_resp;
+        ops->ipcp_flow_dealloc    = ipcp_udp_flow_dealloc;
+        ops->ipcp_du_read         = ipcp_udp_du_read;
+        ops->ipcp_du_write        = ipcp_udp_du_write;
+
+        i->data = (struct ipcp_data *) data;
+        i->ops  = ops;
+
+        i->state = IPCP_INIT;
+
+        return i;
+}
+
+#ifndef MAKE_CHECK
+
+int main (int argc, char * argv[])
+{
+        /* argument 1: pid of irmd ? */
+        /* argument 2: ap name */
+        /* argument 3: instance id */
+        struct sigaction sig_act;
+
+        /* FIXME: clean up argument checks */
+        if (argc != 4)
+                LOG_ERR("Wrong arguments passed.");
+
+        /* store the process id of the irmd */
+        irmd_pid = atoi(argv[1]);
+
+        /* init sig_act */
+        memset (&sig_act, 0, sizeof sig_act);
+
+        /* install signal traps */
+        sig_act.sa_sigaction = &ipcp_sig_handler;
+        sig_act.sa_flags     = SA_SIGINFO;
+
+        sigaction(SIGINT,  &sig_act, NULL);
+        sigaction(SIGTERM, &sig_act, NULL);
+        sigaction(SIGHUP,  &sig_act, NULL);
+
+        _ipcp = ipcp_udp_create(argv[2], argv[3]);
+        if (_ipcp == NULL) {
+                LOG_ERR("Won't.");
+                exit(1);
+        }
+
+        ipcp_main_loop(_ipcp);
+
+        exit(0);
+}
+
+#endif /* MAKE_CHECK */
diff --git a/src/ipcpd/shim-udp/tests/CMakeLists.txt b/src/ipcpd/shim-udp/tests/CMakeLists.txt
new file mode 100644
index 00000000..bdd7defb
--- /dev/null
+++ b/src/ipcpd/shim-udp/tests/CMakeLists.txt
@@ -0,0 +1,33 @@
+get_filename_component(PARENT_SOURCE_PATH ${CMAKE_CURRENT_SOURCE_DIR} DIRECTORY)
+get_filename_component(PARENT_BINARY_PATH ${CMAKE_CURRENT_BINARY_DIR} DIRECTORY)
+get_filename_component(PARENT_DIR ${PARENT_SOURCE_PATH} NAME)
+
+include_directories(${CMAKE_CURRENT_SOURCE_DIR})
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
+
+include_directories(${PARENT_SOURCE_PATH})
+include_directories(${PARENT_BINARY_PATH})
+
+include_directories(${CMAKE_SOURCE_DIR}/include)
+include_directories(${CMAKE_BINARY_DIR}/include)
+
+create_test_sourcelist(${PARENT_DIR}_tests test_suite.c
+                       # Add new tests here
+                       shim_udp_test.c
+)
+
+add_executable(${PARENT_DIR}_test EXCLUDE_FROM_ALL ${IPCP_SOURCES} ${${PARENT_DIR}_tests})
+target_link_libraries(${PARENT_DIR}_test ouroboros)
+
+include(MacroAddCompileFlags)
+MACRO_ADD_COMPILE_FLAGS(${PARENT_DIR}_test -DMAKE_CHECK)
+
+add_dependencies(check ${PARENT_DIR}_test)
+
+set(tests_to_run ${${PARENT_DIR}_tests})
+remove(tests_to_run test_suite.c)
+
+foreach(test ${tests_to_run})
+  get_filename_component(test_name ${test} NAME_WE)
+  add_test(${test_name} ${C_TEST_PATH}/${PARENT_DIR}_test ${test_name})
+endforeach(test)
diff --git a/src/ipcpd/shim-udp/tests/shim_udp_test.c b/src/ipcpd/shim-udp/tests/shim_udp_test.c
new file mode 100644
index 00000000..427d0e1e
--- /dev/null
+++ b/src/ipcpd/shim-udp/tests/shim_udp_test.c
@@ -0,0 +1,103 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Test of the Shim UDP IPCP Daemon
+ *
+ *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <ouroboros/config.h>
+#include <ouroboros/dif_config.h>
+#include <ouroboros/utils.h>
+#include <ouroboros/shm_du_map.h>
+#include <sys/types.h>
+#include <stdlib.h>
+#include "main.c"
+
+#include <ouroboros/logs.h>
+
+struct ipcp * _ipcp;
+
+int shim_udp_test(int argc, char ** argv)
+{
+        /* argument 1: pid of irmd ? */
+        /* argument 2: ap name */
+        /* argument 3: instance id */
+        struct shm_du_map * dum;
+        char * ipcp_name = "test-shim-ipcp";
+        char * i_id = "1";
+        int i = 0;
+
+        char bogus[15];
+        memset (&bogus, 0, 15);
+
+        struct dif_config conf;
+        memset (&conf, 0, sizeof conf);
+        conf.dif_name = strdup("test-dif");
+        conf.type = IPCP_SHIM_UDP;
+        conf.ip_addr = 0;
+
+        dum = shm_du_map_create();
+        if (dum == NULL) {
+                LOG_ERR("Failed to create shared memory.");
+                exit(1);
+        }
+
+        _ipcp = ipcp_udp_create(ipcp_name, i_id);
+        if (_ipcp == NULL) {
+                LOG_ERR("Could not instantiate shim IPCP.");
+                shm_du_map_close(dum);
+                exit(1);
+        }
+
+        if (ipcp_udp_bootstrap (&conf)) {
+                LOG_ERR("Could not bootstrap.");
+        }
+
+        if(ipcp_udp_ap_reg("bogus ap", 1865)) {
+                LOG_ERR("Failed to register application.");
+                shm_du_map_close(dum);
+                exit(1);
+        }
+
+        if (ipcp_udp_ap_unreg(1865)) {
+                LOG_ERR("Failed to unregister application.");
+                shm_du_map_close(dum);
+                exit(1);
+        }
+
+        for (i = 0; i  < 1000; ++i) {
+                sprintf (bogus, "bogus ap %4d", i);
+                if(ipcp_udp_ap_reg(bogus, i)) {
+                         LOG_ERR("Failed to register application %s.", bogus);
+                         shm_du_map_close(dum);
+                         exit(1);
+                }
+        }
+
+        for (i = 0; i  < 1000; ++i) {
+                if(ipcp_udp_ap_unreg(i)) {
+                         LOG_ERR("Failed to unregister application %d.", i);
+                         shm_du_map_close(dum);
+                         exit(1);
+                }
+        }
+
+        shm_du_map_close(dum);
+
+        exit(0);
+}