build: Move connmgr and enrolment to common ground

The connection manager and enrolment components of the unicast and
broadcast IPCP have a lot in common, as conjectured in the paper. The
initial implementation of the broadcast IPCP just duplicated the
code. This moves the shared functionality to common ground.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

1 files changed, 2 insertions, 381 deletions

diff --git a/src/ipcpd/unicast/enroll.c b/src/ipcpd/unicast/enroll.c
index 3abe431e..500a3895 100644
--- a/src/ipcpd/unicast/enroll.c
+++ b/src/ipcpd/unicast/enroll.c
@@ -1,382 +1,3 @@
-/*
- * Ouroboros - Copyright (C) 2016 - 2021
- *
- * Enrollment Task
- *
- *    Dimitri Staessens <dimitri@ouroboros.rocks>
- *    Sander Vrijders   <sander@ouroboros.rocks>
- *
- * 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 BUILD_IPCP_UNICAST
 
-#if defined(__linux__) || defined(__CYGWIN__)
-#define _DEFAULT_SOURCE
-#else
-#define _POSIX_C_SOURCE 199309L
-#endif
-
-#define OUROBOROS_PREFIX "enrollment"
-
-#include <ouroboros/endian.h>
-#include <ouroboros/errno.h>
-#include <ouroboros/time_utils.h>
-#include <ouroboros/dev.h>
-#include <ouroboros/logs.h>
-#include <ouroboros/errno.h>
-#include <ouroboros/sockets.h>
-
-#include "connmgr.h"
-#include "enroll.h"
-#include "ipcp.h"
-
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-#include <pthread.h>
-
-#include "ipcp_config.pb-c.h"
-typedef EnrollMsg enroll_msg_t;
-
-#define ENROLL_COMP             "Enrollment"
-#define ENROLL_PROTO            "OEP" /* Ouroboros enrollment protocol */
-#define ENROLL_WARN_TIME_OFFSET 20
-#define ENROLL_BUF_LEN          1024
-
-enum enroll_state {
-        ENROLL_NULL = 0,
-        ENROLL_INIT,
-        ENROLL_RUNNING
-};
-
-struct {
-        struct ipcp_config conf;
-        enum enroll_state  state;
-        pthread_t          listener;
-} enroll;
-
-static int send_rcv_enroll_msg(int fd)
-{
-        enroll_msg_t    req = ENROLL_MSG__INIT;
-        enroll_msg_t *  reply;
-        uint8_t         buf[ENROLL_BUF_LEN];
-        ssize_t         len;
-        ssize_t         delta_t;
-        struct timespec t0;
-        struct timespec rtt;
-
-        req.code = ENROLL_CODE__ENROLL_REQ;
-
-        len = enroll_msg__get_packed_size(&req);
-        if (len < 0) {
-                log_dbg("Failed pack request message.");
-                return -1;
-        }
-
-        enroll_msg__pack(&req, buf);
-
-        clock_gettime(CLOCK_REALTIME, &t0);
-
-        if (flow_write(fd, buf, len) < 0) {
-                log_dbg("Failed to send request message.");
-                return -1;
-        }
-
-        len = flow_read(fd, buf, ENROLL_BUF_LEN);
-        if (len < 0) {
-                log_dbg("No enrollment reply received.");
-                return -1;
-        }
-
-        log_dbg("Received enrollment info (%zd bytes).", len);
-
-        reply = enroll_msg__unpack(NULL, len, buf);
-        if (reply == NULL) {
-                log_dbg("No enrollment response.");
-                return -1;
-        }
-
-        if (reply->code != ENROLL_CODE__ENROLL_BOOT) {
-                log_dbg("Failed to unpack enrollment response.");
-                enroll_msg__free_unpacked(reply, NULL);
-                return -1;
-        }
-
-        if (!(reply->has_t_sec && reply->has_t_nsec)) {
-                log_dbg("No time in response message.");
-                enroll_msg__free_unpacked(reply, NULL);
-                return -1;
-        }
-
-        clock_gettime(CLOCK_REALTIME, &rtt);
-
-        delta_t = ts_diff_ms(&t0, &rtt);
-
-        rtt.tv_sec  = reply->t_sec;
-        rtt.tv_nsec = reply->t_nsec;
-
-        if (labs(ts_diff_ms(&t0, &rtt)) - delta_t > ENROLL_WARN_TIME_OFFSET)
-                log_warn("Clock offset above threshold.");
-
-        strcpy(enroll.conf.layer_info.layer_name,
-               reply->conf->layer_info->layer_name);
-        enroll.conf.type           = reply->conf->ipcp_type;
-        enroll.conf.addr_size      = reply->conf->addr_size;
-        enroll.conf.eid_size       = reply->conf->eid_size;
-        enroll.conf.max_ttl        = reply->conf->max_ttl;
-        enroll.conf.addr_auth_type = reply->conf->addr_auth_type;
-        enroll.conf.routing_type   = reply->conf->routing_type;
-        enroll.conf.cong_avoid     = reply->conf->cong_avoid;
-        enroll.conf.layer_info.dir_hash_algo
-                = reply->conf->layer_info->dir_hash_algo;
-
-        enroll_msg__free_unpacked(reply, NULL);
-
-        return 0;
-}
-
-static ssize_t enroll_pack(uint8_t ** buf)
-{
-        enroll_msg_t      msg        = ENROLL_MSG__INIT;
-        ipcp_config_msg_t config     = IPCP_CONFIG_MSG__INIT;
-        layer_info_msg_t  layer_info = LAYER_INFO_MSG__INIT;
-        struct timespec   now;
-        ssize_t           len;
-
-        clock_gettime(CLOCK_REALTIME, &now);
-
-        msg.code       = ENROLL_CODE__ENROLL_BOOT;
-        msg.has_t_sec  = true;
-        msg.t_sec      = now.tv_sec;
-        msg.has_t_nsec = true;
-        msg.t_nsec     = now.tv_nsec;
-        msg.conf       = &config;
-
-        config.ipcp_type          = enroll.conf.type;
-        config.has_addr_size      = true;
-        config.addr_size          = enroll.conf.addr_size;
-        config.has_eid_size       = true;
-        config.eid_size           = enroll.conf.eid_size;
-        config.has_max_ttl        = true;
-        config.max_ttl            = enroll.conf.max_ttl;
-        config.has_addr_auth_type = true;
-        config.addr_auth_type     = enroll.conf.addr_auth_type;
-        config.has_routing_type   = true;
-        config.routing_type       = enroll.conf.routing_type;
-        config.has_cong_avoid     = true;
-        config.cong_avoid         = enroll.conf.cong_avoid;
-        config.layer_info         = &layer_info;
-
-        layer_info.layer_name     = (char *) enroll.conf.layer_info.layer_name;
-        layer_info.dir_hash_algo  = enroll.conf.layer_info.dir_hash_algo;
-
-        len = enroll_msg__get_packed_size(&msg);
-
-        *buf = malloc(len);
-        if (*buf == NULL)
-                return -1;
-
-        enroll_msg__pack(&msg, *buf);
-
-        return len;
-}
-
-static void * enroll_handle(void * o)
-{
-        struct conn    conn;
-        uint8_t        buf[ENROLL_BUF_LEN];
-        uint8_t *      reply;
-        ssize_t        len;
-        enroll_msg_t * msg;
-
-        (void) o;
-
-        while (true) {
-                if (connmgr_wait(COMPID_ENROLL, &conn)) {
-                        log_err("Failed to get next connection.");
-                        continue;
-                }
-
-                len = flow_read(conn.flow_info.fd, buf, ENROLL_BUF_LEN);
-                if (len < 0) {
-                        log_err("Failed to read from flow.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                msg = enroll_msg__unpack(NULL, len, buf);
-                if (msg == NULL) {
-                        log_err("Failed to unpack message.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                if (msg->code != ENROLL_CODE__ENROLL_REQ) {
-                        log_err("Wrong message type.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        enroll_msg__free_unpacked(msg, NULL);
-                        continue;
-                }
-
-                log_dbg("Enrolling a new neighbor.");
-
-                enroll_msg__free_unpacked(msg, NULL);
-
-                len = enroll_pack(&reply);
-                if (reply == NULL) {
-                        log_err("Failed to pack enrollment message.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                log_dbg("Sending enrollment info (%zd bytes).", len);
-
-                if (flow_write(conn.flow_info.fd, reply, len) < 0) {
-                        log_err("Failed respond to enrollment request.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        free(reply);
-                        continue;
-                }
-
-                free(reply);
-
-                len = flow_read(conn.flow_info.fd, buf, ENROLL_BUF_LEN);
-                if (len < 0) {
-                        log_err("Failed to read from flow.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                msg = enroll_msg__unpack(NULL, len, buf);
-                if (msg == NULL) {
-                        log_err("Failed to unpack message.");
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                if (msg->code != ENROLL_CODE__ENROLL_DONE || !msg->has_result) {
-                        log_err("Wrong message type.");
-                        enroll_msg__free_unpacked(msg, NULL);
-                        connmgr_dealloc(COMPID_ENROLL, &conn);
-                        continue;
-                }
-
-                if (msg->result == 0)
-                        log_dbg("Neighbor enrollment successful.");
-                else
-                        log_dbg("Neigbor reported failed enrollment.");
-
-                enroll_msg__free_unpacked(msg, NULL);
-
-                connmgr_dealloc(COMPID_ENROLL, &conn);
-        }
-
-        return 0;
-}
-
-int enroll_boot(struct conn * conn)
-{
-        log_dbg("Getting boot information.");
-
-        if (send_rcv_enroll_msg(conn->flow_info.fd)) {
-                log_err("Failed to enroll.");
-                return -1;
-        }
-
-        return 0;
-}
-
-int enroll_done(struct conn * conn,
-                int           result)
-{
-        enroll_msg_t msg = ENROLL_MSG__INIT;
-        uint8_t      buf[ENROLL_BUF_LEN];
-        ssize_t       len;
-
-        msg.code       = ENROLL_CODE__ENROLL_DONE;
-        msg.has_result = true;
-        msg.result     = result;
-
-        len = enroll_msg__get_packed_size(&msg);
-        if (len < 0) {
-                log_dbg("Failed pack request message.");
-                return -1;
-        }
-
-        enroll_msg__pack(&msg, buf);
-
-        if (flow_write(conn->flow_info.fd, buf, len) < 0) {
-                log_dbg("Failed to send acknowledgment.");
-                return -1;
-        }
-
-        return 0;
-}
-
-void enroll_bootstrap(const struct ipcp_config * conf)
-{
-        assert(conf);
-
-        memcpy(&enroll.conf, conf, sizeof(enroll.conf));
-}
-
-struct ipcp_config * enroll_get_conf(void)
-{
-        return &enroll.conf;
-}
-
-int enroll_init(void)
-{
-        struct conn_info info;
-
-        memset(&info, 0, sizeof(info));
-
-        strcpy(info.comp_name, ENROLL_COMP);
-        strcpy(info.protocol, ENROLL_PROTO);
-        info.pref_version = 1;
-        info.pref_syntax  = PROTO_GPB;
-        info.addr         = 0;
-
-        if (connmgr_comp_init(COMPID_ENROLL, &info)) {
-                log_err("Failed to register with connmgr.");
-                return -1;
-        }
-
-        enroll.state = ENROLL_INIT;
-
-        return 0;
-}
-
-void enroll_fini(void)
-{
-        if (enroll.state == ENROLL_RUNNING)
-                pthread_join(enroll.listener, NULL);
-
-        connmgr_comp_fini(COMPID_ENROLL);
-}
-
-int enroll_start(void)
-{
-        if (pthread_create(&enroll.listener, NULL, enroll_handle, NULL))
-                return -1;
-
-        enroll.state = ENROLL_RUNNING;
-
-        return 0;
-}
-
-void enroll_stop(void)
-{
-        if (enroll.state == ENROLL_RUNNING)
-                pthread_cancel(enroll.listener);
-}
+#include "common/enroll.c"