Start work on using libssh2 to establish an SSH session

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "shroom-controller/components/libssh2/libssh2"]
+	path = shroom-controller/components/libssh2/libssh2
+	url = https://github.com/libssh2/libssh2

shroom-controller/components/libssh2/CMakeLists.txt

@@ -0,0 +1,10 @@
+idf_component_register(
+    SRC_DIRS "libssh2/src" # "libssh2/src/threads" "libssh2/src/external"
+    INCLUDE_DIRS "libssh2/include"
+    PRIV_INCLUDE_DIRS "libssh2/src"
+    REQUIRES  "mbedtls"
+)
+
+
+# _3DS is used to have libssh2 provide its own iovec; it doesn't seem to trigger any other behavior for now
+target_compile_options(${COMPONENT_LIB} PRIVATE -Wno-error=format -Wno-error=char-subscripts -DLIBSSH2_MBEDTLS -DHAVE_SYS_SOCKET_H)

shroom-controller/components/libssh2/libssh2

@@ -0,0 +1 @@
+Subproject commit a312b43325e3383c865a87bb1d26cb52e3292641

shroom-controller/main/.gitignore

@@ -1 +1,5 @@
 wifi_private.h
+shrooms-key
+shrooms-key.pub
+shrooms-key.o
+shrooms-key.pub.o

shroom-controller/main/CMakeLists.txt

@@ -5,4 +5,15 @@ idf_component_register(
     esp_driver_gpio
     esp_wifi
     nvs_flash
+    libssh2
+)
+
+# TODO maybe add the commands to generate these?
+# xtensa-esp-elf-objcopy -I binary -O elf32-xtensa-le shrooms-key shrooms-key.o 
+# xtensa-esp-elf-objcopy -I binary -O elf32-xtensa-le shrooms-key.pub shrooms-key.pub.o 
+
+target_link_libraries(
+  ${COMPONENT_LIB}
+  ${CMAKE_CURRENT_SOURCE_DIR}/shrooms-key.o
+  ${CMAKE_CURRENT_SOURCE_DIR}/shrooms-key.pub.o
 )

shroom-controller/main/controller.c

@@ -0,0 +1,9 @@
+static void controller_job(void* args);
+
+void controller_init(void) {
+}
+
+static void controller_job(void* args) {
+}
+
+

shroom-controller/main/main.c

@@ -5,12 +5,33 @@
 #include "esp_wifi.h"
 #include "esp_wifi_default.h"
 
+#include "freertos/FreeRTOS.h"
+#include "freertos/event_groups.h"
+#include "freertos/task.h"
+
 #include "nvs_flash.h"
 
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <netdb.h>
+
+#include "libssh2.h"
+
 #include "wifi_private.h"
 
 const char TAG[] = "main";
 
+// assigned to an esp timer to run after a set time
+static void reconnect_job(void* arg) {
+  // TODO: if it's still disconnected try to reconnect
+}
+static void reconnect_in(int ticks_ms) {
+}
+
+EventGroupHandle_t s_wifi_event_group;
+#define WIFI_FAIL_BIT (1)
+#define WIFI_CONNECTED_BIT (2)
+
 static int s_retry_num = 0;
 static void event_handler(void* arg, esp_event_base_t event_base,
                           int32_t event_id, void* event_data) {
@@ -22,17 +43,116 @@ static void event_handler(void* arg, esp_event_base_t event_base,
             s_retry_num++;
             ESP_LOGI(TAG, "retry to connect to the AP");
         } else {
-            //xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
+            xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
         }
         ESP_LOGI(TAG,"connect to the AP fail");
     } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
         ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
         ESP_LOGI(TAG, "got ip:" IPSTR, IP2STR(&event->ip_info.ip));
         s_retry_num = 0;
-        //xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
+        xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
     }
 }
 
+void main_task(void* args) {
+
+  // connect via TCP here
+  struct addrinfo *results = 0;
+
+  int rc = libssh2_init(0);
+  if (rc) {
+    ESP_LOGE(TAG, "libssh2 initialization failed: %d", rc);
+    // TODO panic
+  }
+
+  while (true) {
+    xEventGroupWaitBits(s_wifi_event_group, WIFI_CONNECTED_BIT, 0, pdTRUE, portMAX_DELAY); 
+    if (!(xEventGroupGetBits(s_wifi_event_group) & WIFI_CONNECTED_BIT)) {
+      continue;
+    }
+
+    struct addrinfo hints = {};
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_socktype= SOCK_STREAM;
+
+    ESP_LOGI(TAG, "looking up server...");
+    rc = getaddrinfo("batmanbatman.local", "22", &hints, &results);
+    if (rc) {
+      ESP_LOGE(TAG, "getaddrinfo failed: %d", rc);
+      break;
+    }
+
+    if (!results) {
+      ESP_LOGE(TAG, "getaddrinfo returned no results");
+      // TODO sleep and try again?
+      break;
+    }
+
+    bool connect_success = false;
+    libssh2_socket_t sock = LIBSSH2_INVALID_SOCKET;
+    for (struct addrinfo* rp = results; rp; rp = rp->ai_next) {
+      ESP_LOGI(TAG, "creating socket fam %d type %d proto %d", rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+      sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+
+      if (sock == LIBSSH2_INVALID_SOCKET) {
+        ESP_LOGE(TAG, "failed to create socket");
+        continue;
+      }
+
+      if (connect(sock, results->ai_addr, results->ai_addrlen) != -1) {
+        ESP_LOGE(TAG, "connected successfully");
+        connect_success = true;
+        break;
+      }
+
+      close(sock);
+      sock = LIBSSH2_INVALID_SOCKET;
+    }
+
+    freeaddrinfo(results);
+    if (!connect_success) {
+      // TODO I guess sleep for a bit and retry?
+      break;
+    }
+
+    ESP_LOGI(TAG, "connection established, creating SSH session...");
+
+    LIBSSH2_SESSION* session = libssh2_session_init();
+    if (!session) {
+      ESP_LOGE(TAG, "could not create libssh2 session");
+      // TODO error out
+    }
+
+    libssh2_trace(session, -0);
+
+    libssh2_session_handshake(session, sock);
+
+    const char* fingerprint = libssh2_hostkey_hash(session, LIBSSH2_HOSTKEY_HASH_SHA1);
+
+    const char username[] = "shrooms";
+    extern char* _binary_shrooms_key_start;
+    extern size_t _binary_shrooms_key_size;
+    extern char* _binary_shrooms_key_pub_start;
+    extern size_t _binary_shrooms_key_pub_size;
+
+    rc = libssh2_userauth_publickey_frommemory(
+        session,
+        username,
+        sizeof(username) - 1,
+        _binary_shrooms_key_pub_start,
+        _binary_shrooms_key_pub_size,
+        _binary_shrooms_key_start,
+        _binary_shrooms_key_size,
+        NULL);
+
+    // TODO the rest of it
+    break;
+  }
+
+  while (true);
+}
+
+
 void app_main(void) {
   esp_err_t ret = nvs_flash_init();
   if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
@@ -43,6 +163,8 @@ void app_main(void) {
 
   wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
 
+  s_wifi_event_group = xEventGroupCreate();
+
   ESP_ERROR_CHECK(esp_netif_init());
   ESP_ERROR_CHECK(esp_event_loop_create_default());
   esp_netif_create_default_wifi_sta();
@@ -68,4 +190,9 @@ void app_main(void) {
 
   ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
   ESP_ERROR_CHECK(esp_wifi_start());
+
+  if (xTaskCreate(main_task, "ssh task", 4096, NULL, 17, NULL) != pdPASS) {
+    ESP_LOGE(TAG, "unable to create ssh task");
+    // TODO panic
+  }
 }