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Diffstat (limited to 'src/ipcpd/common/connmgr.c')
-rw-r--r--src/ipcpd/common/connmgr.c518
1 files changed, 518 insertions, 0 deletions
diff --git a/src/ipcpd/common/connmgr.c b/src/ipcpd/common/connmgr.c
new file mode 100644
index 00000000..9002467c
--- /dev/null
+++ b/src/ipcpd/common/connmgr.c
@@ -0,0 +1,518 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2021
+ *
+ * Handles connections between components
+ *
+ * Dimitri Staessens <[email protected]>
+ * Sander Vrijders <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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., http://www.fsf.org/about/contact/.
+ */
+
+#define OUROBOROS_PREFIX "connection-manager"
+
+#include <ouroboros/dev.h>
+#include <ouroboros/cacep.h>
+#include <ouroboros/errno.h>
+#include <ouroboros/list.h>
+#include <ouroboros/logs.h>
+#include <ouroboros/notifier.h>
+
+#include "connmgr.h"
+#include "ipcp.h"
+
+#include <pthread.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+
+enum connmgr_state {
+ CONNMGR_NULL = 0,
+ CONNMGR_INIT,
+ CONNMGR_RUNNING
+};
+
+struct conn_el {
+ struct list_head next;
+ struct conn conn;
+};
+
+struct comp {
+ struct conn_info info;
+
+ struct list_head conns;
+ struct list_head pending;
+
+ pthread_cond_t cond;
+ pthread_mutex_t lock;
+};
+
+struct {
+ struct comp comps[COMPID_MAX];
+ enum connmgr_state state;
+
+ pthread_t acceptor;
+} connmgr;
+
+static int get_id_by_name(const char * name)
+{
+ enum comp_id i;
+
+ for (i = 0; i < COMPID_MAX; ++i)
+ if (strcmp(name, connmgr.comps[i].info.comp_name) == 0)
+ return i;
+
+ return -1;
+}
+
+static int get_conn_by_fd(int fd,
+ enum comp_id id,
+ struct conn * conn)
+{
+ struct list_head * p;
+
+ pthread_mutex_lock(&connmgr.comps[id].lock);
+
+ list_for_each(p, &connmgr.comps[id].conns) {
+ struct conn_el * c =
+ list_entry(p, struct conn_el, next);
+ if (c->conn.flow_info.fd == fd) {
+ *conn = c->conn;
+ pthread_mutex_unlock(&connmgr.comps[id].lock);
+ return 0;
+ }
+ }
+
+ pthread_mutex_unlock(&connmgr.comps[id].lock);
+
+ return -1;
+}
+
+static int add_comp_conn(enum comp_id id,
+ int fd,
+ qosspec_t qs,
+ struct conn_info * rcv_info)
+{
+ struct conn_el * el;
+
+ el = malloc(sizeof(*el));
+ if (el == NULL) {
+ log_err("Not enough memory.");
+ return -1;
+ }
+
+ el->conn.conn_info = *rcv_info;
+ el->conn.flow_info.fd = fd;
+ el->conn.flow_info.qs = qs;
+
+ pthread_mutex_lock(&connmgr.comps[id].lock);
+
+ list_add(&el->next, &connmgr.comps[id].pending);
+ pthread_cond_signal(&connmgr.comps[id].cond);
+
+ pthread_mutex_unlock(&connmgr.comps[id].lock);
+
+ return 0;
+}
+
+static void * flow_acceptor(void * o)
+{
+ int fd;
+ qosspec_t qs;
+ struct conn_info rcv_info;
+ struct conn_info fail_info;
+
+ (void) o;
+
+ memset(&fail_info, 0, sizeof(fail_info));
+
+ while (true) {
+ int id;
+
+ fd = flow_accept(&qs, NULL);
+ if (fd < 0) {
+ if (fd != -EIRMD)
+ log_warn("Flow accept failed: %d", fd);
+ continue;
+ }
+
+ if (cacep_rcv(fd, &rcv_info)) {
+ log_dbg("Error establishing application connection.");
+ flow_dealloc(fd);
+ continue;
+ }
+
+ id = get_id_by_name(rcv_info.comp_name);
+ if (id < 0) {
+ log_dbg("Connection request for unknown component %s.",
+ rcv_info.comp_name);
+ cacep_snd(fd, &fail_info);
+ flow_dealloc(fd);
+ continue;
+ }
+
+ assert(id < COMPID_MAX);
+
+ if (cacep_snd(fd, &connmgr.comps[id].info)) {
+ log_dbg("Failed to respond to request.");
+ flow_dealloc(fd);
+ continue;
+ }
+
+ if (add_comp_conn(id, fd, qs, &rcv_info)) {
+ log_dbg("Failed to add new connection.");
+ flow_dealloc(fd);
+ continue;
+ }
+ }
+
+ return (void *) 0;
+}
+
+static void handle_event(void * self,
+ int event,
+ const void * o)
+{
+ struct conn conn;
+
+ (void) self;
+
+ if (!(event == NOTIFY_DT_FLOW_UP ||
+ event == NOTIFY_DT_FLOW_DOWN ||
+ event == NOTIFY_DT_FLOW_DEALLOC))
+ return;
+
+ if (get_conn_by_fd(*((int *) o), COMPID_DT, &conn))
+ return;
+
+ switch (event) {
+ case NOTIFY_DT_FLOW_UP:
+ notifier_event(NOTIFY_DT_CONN_UP, &conn);
+ break;
+ case NOTIFY_DT_FLOW_DOWN:
+ notifier_event(NOTIFY_DT_CONN_DOWN, &conn);
+ break;
+ case NOTIFY_DT_FLOW_DEALLOC:
+ notifier_event(NOTIFY_DT_CONN_DEL, &conn);
+ break;
+ default:
+ break;
+ }
+}
+
+int connmgr_init(void)
+{
+ connmgr.state = CONNMGR_INIT;
+
+ if (notifier_reg(handle_event, NULL))
+ return -1;
+
+ return 0;
+}
+
+void connmgr_fini(void)
+{
+ int i;
+
+ notifier_unreg(handle_event);
+
+ if (connmgr.state == CONNMGR_RUNNING)
+ pthread_join(connmgr.acceptor, NULL);
+
+ for (i = 0; i < COMPID_MAX; ++i)
+ connmgr_comp_fini(i);
+}
+
+int connmgr_start(void)
+{
+ if (pthread_create(&connmgr.acceptor, NULL, flow_acceptor, NULL))
+ return -1;
+
+ connmgr.state = CONNMGR_RUNNING;
+
+ return 0;
+}
+
+void connmgr_stop(void)
+{
+ if (connmgr.state == CONNMGR_RUNNING)
+ pthread_cancel(connmgr.acceptor);
+}
+
+int connmgr_comp_init(enum comp_id id,
+ const struct conn_info * info)
+{
+ struct comp * comp;
+
+ assert(id >= 0 && id < COMPID_MAX);
+
+ comp = connmgr.comps + id;
+
+ if (pthread_mutex_init(&comp->lock, NULL))
+ return -1;
+
+ if (pthread_cond_init(&comp->cond, NULL)) {
+ pthread_mutex_destroy(&comp->lock);
+ return -1;
+ }
+
+ list_head_init(&comp->conns);
+ list_head_init(&comp->pending);
+
+ memcpy(&connmgr.comps[id].info, info, sizeof(connmgr.comps[id].info));
+
+ return 0;
+}
+
+void connmgr_comp_fini(enum comp_id id)
+{
+ struct list_head * p;
+ struct list_head * h;
+ struct comp * comp;
+
+ assert(id >= 0 && id < COMPID_MAX);
+
+ if (strlen(connmgr.comps[id].info.comp_name) == 0)
+ return;
+
+ comp = connmgr.comps + id;
+
+ pthread_mutex_lock(&comp->lock);
+
+ list_for_each_safe(p, h, &comp->conns) {
+ struct conn_el * e = list_entry(p, struct conn_el, next);
+ list_del(&e->next);
+ free(e);
+ }
+
+ list_for_each_safe(p, h, &comp->pending) {
+ struct conn_el * e = list_entry(p, struct conn_el, next);
+ list_del(&e->next);
+ free(e);
+ }
+
+ pthread_mutex_unlock(&comp->lock);
+
+ pthread_cond_destroy(&comp->cond);
+ pthread_mutex_destroy(&comp->lock);
+
+ memset(&connmgr.comps[id].info, 0, sizeof(connmgr.comps[id].info));
+}
+
+int connmgr_ipcp_connect(const char * dst,
+ const char * component,
+ qosspec_t qs)
+{
+ struct conn_el * ce;
+ int id;
+
+ assert(dst);
+ assert(component);
+
+ ce = malloc(sizeof(*ce));
+ if (ce == NULL) {
+ log_dbg("Out of memory.");
+ return -1;
+ }
+
+ id = get_id_by_name(component);
+ if (id < 0) {
+ log_dbg("No such component: %s", component);
+ free(ce);
+ return -1;
+ }
+
+ if (connmgr_alloc(id, dst, &qs, &ce->conn)) {
+ free(ce);
+ return -1;
+ }
+
+ if (strlen(dst) > DST_MAX_STRLEN) {
+ log_warn("Truncating dst length for connection.");
+ memcpy(ce->conn.flow_info.dst, dst, DST_MAX_STRLEN);
+ ce->conn.flow_info.dst[DST_MAX_STRLEN] = '\0';
+ } else {
+ strcpy(ce->conn.flow_info.dst, dst);
+ }
+
+ pthread_mutex_lock(&connmgr.comps[id].lock);
+
+ list_add(&ce->next, &connmgr.comps[id].conns);
+
+ pthread_mutex_unlock(&connmgr.comps[id].lock);
+
+ return 0;
+}
+
+int connmgr_ipcp_disconnect(const char * dst,
+ const char * component)
+{
+ struct list_head * p;
+ struct list_head * h;
+ int id;
+
+ assert(dst);
+ assert(component);
+
+ id = get_id_by_name(component);
+ if (id < 0)
+ return -1;
+
+ pthread_mutex_lock(&connmgr.comps[id].lock);
+
+ list_for_each_safe(p,h, &connmgr.comps[id].conns) {
+ struct conn_el * el = list_entry(p, struct conn_el, next);
+ if (strcmp(el->conn.flow_info.dst, dst) == 0) {
+ int ret;
+ pthread_mutex_unlock(&connmgr.comps[id].lock);
+ list_del(&el->next);
+ ret = connmgr_dealloc(id, &el->conn);
+ free(el);
+ return ret;
+ }
+ }
+
+ pthread_mutex_unlock(&connmgr.comps[id].lock);
+
+ return 0;
+}
+
+int connmgr_alloc(enum comp_id id,
+ const char * dst,
+ qosspec_t * qs,
+ struct conn * conn)
+{
+ assert(id >= 0 && id < COMPID_MAX);
+ assert(dst);
+
+ conn->flow_info.fd = flow_alloc(dst, qs, NULL);
+ if (conn->flow_info.fd < 0) {
+ log_dbg("Failed to allocate flow to %s.", dst);
+ return -1;
+ }
+
+ if (qs != NULL)
+ conn->flow_info.qs = *qs;
+ else
+ memset(&conn->flow_info.qs, 0, sizeof(conn->flow_info.qs));
+
+ log_dbg("Sending cacep info for protocol %s to fd %d.",
+ connmgr.comps[id].info.protocol, conn->flow_info.fd);
+
+ if (cacep_snd(conn->flow_info.fd, &connmgr.comps[id].info)) {
+ log_dbg("Failed to create application connection.");
+ flow_dealloc(conn->flow_info.fd);
+ return -1;
+ }
+
+ if (cacep_rcv(conn->flow_info.fd, &conn->conn_info)) {
+ log_dbg("Failed to connect to application.");
+ flow_dealloc(conn->flow_info.fd);
+ return -1;
+ }
+
+ if (strcmp(connmgr.comps[id].info.protocol, conn->conn_info.protocol)) {
+ log_dbg("Unknown protocol (requested %s, got %s).",
+ connmgr.comps[id].info.protocol,
+ conn->conn_info.protocol);
+ flow_dealloc(conn->flow_info.fd);
+ return -1;
+ }
+
+ if (connmgr.comps[id].info.pref_version !=
+ conn->conn_info.pref_version) {
+ log_dbg("Unknown protocol version.");
+ flow_dealloc(conn->flow_info.fd);
+ return -1;
+ }
+
+ if (connmgr.comps[id].info.pref_syntax != conn->conn_info.pref_syntax) {
+ log_dbg("Unknown protocol syntax.");
+ flow_dealloc(conn->flow_info.fd);
+ return -1;
+ }
+
+ switch (id) {
+ case COMPID_DT:
+ notifier_event(NOTIFY_DT_CONN_ADD, conn);
+#if defined(BUILD_IPCP_UNICAST) && defined(IPCP_CONN_WAIT_DIR)
+ dir_wait_running();
+#endif
+ break;
+ case COMPID_MGMT:
+ notifier_event(NOTIFY_MGMT_CONN_ADD, conn);
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+int connmgr_dealloc(enum comp_id id,
+ struct conn * conn)
+{
+ switch (id) {
+ case COMPID_DT:
+ notifier_event(NOTIFY_DT_CONN_DEL, conn);
+ break;
+#if defined(BUILD_IPCP_UNICAST) && defined(IPCP_CONN_WAIT_DIR)
+ case COMPID_MGMT:
+ notifier_event(NOTIFY_MGMT_CONN_DEL, conn);
+ break;
+#endif
+ default:
+ break;
+ }
+
+ return flow_dealloc(conn->flow_info.fd);
+}
+
+
+int connmgr_wait(enum comp_id id,
+ struct conn * conn)
+{
+ struct conn_el * el;
+ struct comp * comp;
+
+ assert(id >= 0 && id < COMPID_MAX);
+ assert(conn);
+
+ comp = connmgr.comps + id;
+
+ pthread_mutex_lock(&comp->lock);
+
+ pthread_cleanup_push((void(*)(void *))pthread_mutex_unlock,
+ (void *) &comp->lock);
+
+ while (list_is_empty(&comp->pending))
+ pthread_cond_wait(&comp->cond, &comp->lock);
+
+ pthread_cleanup_pop(false);
+
+ el = list_first_entry((&comp->pending), struct conn_el, next);
+ if (el == NULL) {
+ pthread_mutex_unlock(&comp->lock);
+ return -1;
+ }
+
+ *conn = el->conn;
+
+ list_del(&el->next);
+ list_add(&el->next, &connmgr.comps[id].conns);
+
+ pthread_mutex_unlock(&comp->lock);
+
+ return 0;
+}
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