firmware: CHAMOS & CHAMOC intercomunication

dist/tools/chamoc/.gitignore

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+
+CHAMOC.out

dist/tools/chamoc/autoconfigure.sh

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+#!/usr/bin/env bash
+
+SUDO=${SUDO:-sudo}
+PREFIX=64
+NPREFIX=::
+
+unsupported_platform() {
+    echo "unsupported platform" >&2
+    echo "(currently supported \`uname -s\` 'Darwin' and 'Linux')" >&2
+}
+
+case "$(uname -s)" in
+    Darwin)
+        PLATFORM="OSX";;
+    Linux)
+        PLATFORM="Linux";;
+    *)
+        unsupported_platform
+        exit 1
+        ;;
+esac
+
+INTERFACE_CHECK_COUNTER=5  # 5 attempts to find usb interface
+
+find_interface() {
+    INTERFACE=$(ls -A /sys/bus/usb/drivers/cdc_ether/*/net/ 2>/dev/null)
+    INTERFACE_CHECK=$(echo -n "${INTERFACE}" | head -c1 | wc -c)
+    if [ "${INTERFACE_CHECK}" -eq 0 ] && [ ${INTERFACE_CHECK_COUNTER} != 0 ]; then
+        # We want to have multiple opportunities to find the USB interface
+        # as sometimes it can take a few seconds for it to enumerate after
+        # the device has been flashed.
+        sleep 1
+        ((INTERFACE_CHECK_COUNTER=INTERFACE_CHECK_COUNTER-1))
+        find_interface
+    fi
+    INTERFACE=${INTERFACE%/}
+}
+
+echo "Waiting for network interface."
+find_interface
+
+add_addresses(){
+    case "${PLATFORM}" in
+        Linux)
+            ${SUDO} sysctl -w net.ipv6.conf."${INTERFACE}".forwarding=1
+            ${SUDO} sysctl -w net.ipv6.conf."${INTERFACE}".accept_ra=0
+            ${SUDO} ip link set "${INTERFACE}" up
+            ${SUDO} ip a a "${IPV6_GLOBAL}"/64 dev "${INTERFACE}"
+            ${SUDO} ip route add "${NPREFIX}" via "${IPV6_GLOBAL}" dev "${INTERFACE}"
+            gcc -Iinclude *.c -o CHAMOC.out
+            echo "Start sending a nib add request"
+            ${SUDO} ./CHAMOC.out nib add "${INTERFACE}" "${IPV6_GLOBAL}" "${PREFIX}"
+            ;;
+        OSX)
+            ${SUDO} sysctl -w net.ipv6.conf."${INTERFACE}".forwarding=1
+            ${SUDO} sysctl -w net.ipv6.conf."${INTERFACE}".accept_ra=0
+            ${SUDO} ip link set "${INTERFACE}" up
+            ${SUDO} ip a a "${IPV6_GLOBAL}"/64 dev "${INTERFACE}"
+            ${SUDO} ip route add "${NPREFIX}" via "${IPV6_GLOBAL}" dev "${INTERFACE}"
+            gcc -Iinclude *.c -o CHAMOC.out
+            echo "Start sending a nib add request"
+            ${SUDO} ./CHAMOC.out nib add "${INTERFACE}" "${IPV6_GLOBAL}" "${PREFIX}"
+            ;;
+    esac
+}
+
+close_connection(){
+            echo "Start sending a nib delete request"
+            ${SUDO} ./CHAMOC.out nib del "${INTERFACE}" "${IPV6_GLOBAL}" "${PREFIX}"
+            ${SUDO} ip link set "${INTERFACE}" up
+            ${SUDO} ip a d "${IPV6_GLOBAL}"/64 dev "${INTERFACE}"
+            ${SUDO} ip route del "${NPREFIX}" via "${IPV6_GLOBAL}" dev "${INTERFACE}"
+}
+
+IPV6_GLOBAL=$1
+
+if [ -z "${IPV6_GLOBAL}" ]; then
+    IPV6_GLOBAL="2001:db8::1"
+fi
+
+find_interface
+
+if [ -z "${INTERFACE}" ]; then
+   echo "USB network interface not found"
+else
+    add_addresses
+    echo "Connection started"
+    echo "Press any key to close connection"
+    read -r -n 1
+    close_connection
+fi

dist/tools/chamoc/chamoc_msg.c

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+/*
+ * Copyright (c) 2022 Mesh4all <mesh4all.org>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @brief   CHAMOC_MSG
+ *
+ * @author  eduazocar<[email protected]>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include "client.h"
+#include "chamoc_msg.h"
+
+int serialize(chamoc_message_t msg, char *buffer, uint8_t len) {
+    uint8_t strbuff[19] = {msg.message, msg.seqno, msg.prefix};
+    for (int i = 0; i < 16; i++) {
+        strbuff[3 + i] = msg.addr.in_8[i];
+    }
+    memcpy(buffer, strbuff, len);
+}
+
+int connect_chamos(chamos_client_t client, char *buffer, uint8_t len) {
+    struct timeval tv;
+    tv.tv_sec = 2;
+    tv.tv_usec = 0;
+    int tries = 0;
+    if (setsockopt(client.socket, SOL_SOCKET, SO_RCVTIMEO, (char *)&tv, sizeof(tv)) < 0) {
+        printf("configuration_failed\n");
+        return -1;
+    }
+
+    while (tries < 5) {
+        send_message(&client, (uint8_t *)buffer, len);
+        recv(client.socket, buffer, len, 0);
+        if (buffer[0] == MSG_ACK) {
+            printf("Request Confirmed\n");
+            break;
+        } else {
+            tries++;
+            if (tries < 5) {
+                printf("Bad Request, Trying Again\n");
+            } else {
+                printf("Time Out\n\n");
+            }
+        }
+    }
+    return 1;
+}
+
+uint8_t craft_seqno(chamos_client_t *client) { client->seqno += 1; }
+
+int8_t send_message(chamos_client_t *client, uint8_t *msg, uint8_t len) {
+    if (client->socket < 0) {
+        return -1;
+    }
+    sendto(client->socket, msg, len, 0, (struct sockaddr *)&client->csock, sizeof(client->csock));
+    return 1;
+}
+
+#ifdef DEBUG_MODE
+void printf_buff(char *buffer, uint8_t len) {
+    for (int i = 0; i < len; i++) {
+        if (i > 2) {
+            printf("%02hhx", (uint8_t)buffer[i]);
+        } else {
+            printf("%d", (uint8_t)buffer[i]);
+        }
+    }
+    printf("\n");
+}
+#endif

dist/tools/chamoc/client.c

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+/*
+ * Copyright (c) 2022 Mesh4all <mesh4all.org>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @brief   CHAMOC_client
+ *
+ * @author  eduazocar<[email protected]>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include "client.h"
+#include "chamoc_msg.h"
+#include "nib.h"
+
+chamos_client_t new_client(char *netif) {
+    chamos_client_t client;
+    socklen_t client_len = sizeof(client.csock);
+    client.socket = socket(PF_INET6, SOCK_DGRAM, 0);
+    memset(&client.csock, '\0', sizeof(client.csock));
+    client.csock.sin6_family = AF_INET6;
+    client.csock.sin6_port = htons(CHAMOC_PORT);
+    if (inet_pton(AF_INET6, MULTICAST_ADDR, &client.csock.sin6_addr) < 0) {
+        client.socket = -1;
+    };
+    if (setsockopt(client.socket, SOL_SOCKET, SO_BINDTODEVICE, netif, client_len) < 0) {
+        printf("Failed binding\n");
+    }
+    if (client.socket < 0) {
+        printf("Wrong socket init \n");
+        exit(0);
+    }
+    return client;
+}

dist/tools/chamoc/doc.txt

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+/**
+@defgroup chamoc Chamoc
+@ingroup  network
+
+## CHAMOC (Communication Handler for Addressing Management | Origin client)
+
+The module CHAMOC It's used for client-side communication for nib routing table.
+In this tools will be there an compiled program called CHAMOC.out that has a client
+interface with an m4a-24g board. The client node will be sending `chamoc_message_t` data.
+that contains an `[Type message]` tell to the system how process the message. (Nib_add or Nib_del),
+others field are the `[sequence number], [host ip address] to add as neighborh route,
+and the `[network lenght prefix] generally is /64.
+
+### Steps to initialize the client socket
+
+- You should has the chamos_server in your m4a-24g board (Also, could run the chamoc_server inside to the test directory)
+- Run the ./start_network.sh script and assign the board global address as argument (e.g: 2001:db8::1 64)
+- Run the ./autoconfig.sh script
+- Wait that nib_request is accepted.
+
+### start_network.sh
+
+When you are running start_network.sh and add an ipv6 address like this:
+```sh
+    ./start_network.sh 2001:db8::1/64
+```
+you are assigning to the m4a-24g board (`usb-cdc element`) the global address to stablish the communication
+in the wired interface.
+
+### Testing communication
+
+before to run the autoconfig.sh script you can do some pings to the m4a-24g board interface.
+first follow these steps to locate, and do ping between both devices.
+
+- Locate your interface
+
+using net-tools
+```sh
+    ifconfig
+    # Output
+    enx5a008df2d56b: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
+        inet 192.168.1.199  netmask 255.255.255.0  broadcast 192.168.1.255
+        inet6 fe80::98eb:d858:51a0:dcc0  prefixlen 64  scopeid 0x20<link>
+        inet6 2001:db8::1  prefixlen 64  scopeid 0x0<global>
+        ether 5a:00:8d:f2:d5:6b  txqueuelen 1000  (Ethernet)
+...
+
+```
+
+```sh
+    ifconfig
+```
+
+with ip address command.
+```sh
+    ip address show
+    # Output
+    22: enx5a008df2d56b: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel s
+    ...
+        valid_lft forever preferred_lft forever
+    inet6 2001:db8::1/64 scope global
+       valid_lft forever preferred_lft forever
+    inet6 fe80::98eb:d858:51a0:dcc0/64 scope link noprefixroute
+       valid_lft forever preferred_lft forever
+
+```
+@note : Observe that the interface has the wish global address (e.g: 2001:db8::1/64).
+
+- Do ping6 to the M4a-24g address `2001:db8::2/64`
+```sh
+    ping 2001:db8::2 -c3
+    # expected output
+    PING 2001:db8::2(2001:db8::2) 56 data bytes
+    64 bytes from 2001:db8::2: icmp_seq=1 ttl=64 time=0.911 ms
+    64 bytes from 2001:db8::2: icmp_seq=2 ttl=64 time=1.02 ms
+    64 bytes from 2001:db8::2: icmp_seq=3 ttl=64 time=1.01 ms
+```
+
+### autoconfigure:
+
+Running the script you will has as result the compilation and execution to the client program CHAMOC.out
+This test automatically will be start sending the nib_add and nib_del request taking as parameters.
+`[Name of interface]``[ip address]``[prefix_len].
+
+``sh
+    ./autoconfigure.sh
+    Waiting for network interface.
+    Start sending a nib add request
+    Bad Request, Trying Again           # Timeout time to wait a response
+    Request Confirmed                   # Case when the request was correctly sent
+    Start sending a nib delete request
+    Request Confirmed
+```
+
+@note: the chamoc intercomunnication has five attempts to wait a response from the server
+
+### Running with chamoc_server
+    in the folder /test, there are an example of chamoc_server running. this will be
+    waiting and MSG_NIB_ADD or MSG_NIB_DEL, if these are received correctly response with a
+    MSG_ACK, in case that the message was wrong received, the server will send an MSG_NACK.
+    To start this server only has to run the script in the test_folder.
+*/