sway: refactor ipc_client_handle_command()

This fixes a few mem leaks, as well as remove a false-positive error msg
in IPC_GET_BAR_CONFIG

1 files changed, 35 insertions, 27 deletions

diff --git a/sway/ipc-server.c b/sway/ipc-server.c
index 05041ec1..13e1837a 100644
--- a/sway/ipc-server.c
+++ b/sway/ipc-server.c
@@ -292,6 +292,11 @@ void ipc_client_handle_command(struct ipc_client *client) {
         }
 
         char *buf = malloc(client->payload_length + 1);
+        if (!buf) {
+                sway_log_errno(L_INFO, "Out of memory");
+                ipc_client_disconnect(client);
+                return;
+        }
         if (client->payload_length > 0)
         {
                 ssize_t received = recv(client->fd, buf, client->payload_length, 0);
@@ -303,28 +308,27 @@ void ipc_client_handle_command(struct ipc_client *client) {
                         return;
                 }
         }
+        buf[client->payload_length] = '\0';
 
         switch (client->current_command) {
         case IPC_COMMAND:
         {
-                buf[client->payload_length] = '\0';
                 struct cmd_results *results = handle_command(buf);
                 const char *json = cmd_results_to_json(results);
                 char reply[256];
                 int length = snprintf(reply, sizeof(reply), "%s", json);
                 ipc_send_reply(client, reply, (uint32_t) length);
                 free_cmd_results(results);
-                break;
+                goto exit_cleanup;
         }
+
         case IPC_SUBSCRIBE:
         {
-                buf[client->payload_length] = '\0';
                 struct json_object *request = json_tokener_parse(buf);
                 if (request == NULL) {
                         ipc_send_reply(client, "{\"success\": false}", 18);
-                        ipc_client_disconnect(client);
-                        free(buf);
-                        return;
+                        sway_log_errno(L_INFO, "Failed to read request");
+                        goto exit_cleanup;
                 }
 
                 // parse requested event types
@@ -344,18 +348,18 @@ void ipc_client_handle_command(struct ipc_client *client) {
 #endif
                         } else {
                                 ipc_send_reply(client, "{\"success\": false}", 18);
-                                ipc_client_disconnect(client);
                                 json_object_put(request);
-                                free(buf);
-                                return;
+                                sway_log_errno(L_INFO, "Failed to parse request");
+                                goto exit_cleanup;
                         }
                 }
 
                 json_object_put(request);
 
                 ipc_send_reply(client, "{\"success\": true}", 17);
-                break;
+                goto exit_cleanup;
         }
+
         case IPC_GET_WORKSPACES:
         {
                 json_object *workspaces = json_object_new_array();
@@ -363,8 +367,9 @@ void ipc_client_handle_command(struct ipc_client *client) {
                 const char *json_string = json_object_to_json_string(workspaces);
                 ipc_send_reply(client, json_string, (uint32_t) strlen(json_string));
                 json_object_put(workspaces); // free
-                break;
+                goto exit_cleanup;
         }
+
         case IPC_GET_INPUTS:
         {
                 json_object *inputs = json_object_new_array();
@@ -381,8 +386,9 @@ void ipc_client_handle_command(struct ipc_client *client) {
                 const char *json_string = json_object_to_json_string(inputs);
                 ipc_send_reply(client, json_string, (uint32_t) strlen(json_string));
                 json_object_put(inputs);
-                break;
+                goto exit_cleanup;
         }
+
         case IPC_GET_OUTPUTS:
         {
                 json_object *outputs = json_object_new_array();
@@ -390,8 +396,9 @@ void ipc_client_handle_command(struct ipc_client *client) {
                 const char *json_string = json_object_to_json_string(outputs);
                 ipc_send_reply(client, json_string, (uint32_t) strlen(json_string));
                 json_object_put(outputs); // free
-                break;
+                goto exit_cleanup;
         }
+
         case IPC_GET_VERSION:
         {
 #if defined SWAY_GIT_VERSION && defined SWAY_GIT_BRANCH && defined SWAY_VERSION_DATE
@@ -419,29 +426,29 @@ void ipc_client_handle_command(struct ipc_client *client) {
                 ipc_send_reply(client, json_string, (uint32_t)strlen(json_string));
                 json_object_put(json); // free
                 free(full_version);
-                break;
+                goto exit_cleanup;
         }
+
         case IPC_SWAY_GET_PIXELS:
         {
                 char response_header[9];
                 memset(response_header, 0, sizeof(response_header));
-                buf[client->payload_length] = '\0';
                 swayc_t *output = swayc_by_test(&root_container, output_by_name_test, buf);
                 if (!output) {
                         sway_log(L_ERROR, "IPC GET_PIXELS request with unknown output name");
                         ipc_send_reply(client, response_header, sizeof(response_header));
-                        break;
+                        goto exit_cleanup;
                 }
                 struct get_pixels_request *req = malloc(sizeof(struct get_pixels_request));
                 req->client = client;
                 req->output = output->handle;
                 list_add(ipc_get_pixel_requests, req);
                 wlc_output_schedule_render(output->handle);
-                break;
+                goto exit_cleanup;
         }
+
         case IPC_GET_BAR_CONFIG:
         {
-                buf[client->payload_length] = '\0';
                 if (!buf[0]) {
                         // Send list of configured bar IDs
                         json_object *bars = json_object_new_array();
@@ -455,7 +462,6 @@ void ipc_client_handle_command(struct ipc_client *client) {
                         json_object_put(bars); // free
                 } else {
                         // Send particular bar's details
-                        buf[client->payload_length] = '\0';
                         struct bar_config *bar = NULL;
                         int i;
                         for (i = 0; i < config->bars->length; ++i) {
@@ -468,23 +474,24 @@ void ipc_client_handle_command(struct ipc_client *client) {
                         if (!bar) {
                                 const char *error = "{ \"success\": false, \"error\": \"No bar with that ID\" }";
                                 ipc_send_reply(client, error, (uint32_t)strlen(error));
-                                break;
+                                goto exit_cleanup;
                         }
                         json_object *json = ipc_json_describe_bar_config(bar);
                         const char *json_string = json_object_to_json_string(json);
                         ipc_send_reply(client, json_string, (uint32_t)strlen(json_string));
                         json_object_put(json); // free
-                        break;
                 }
+                goto exit_cleanup;
         }
+
         default:
                 sway_log(L_INFO, "Unknown IPC command type %i", client->current_command);
-                ipc_client_disconnect(client);
-                return;
+                goto exit_cleanup;
         }
 
-        client->payload_length = 0;
+exit_cleanup:
         free(buf);
+        return;
 }
 
 bool ipc_send_reply(struct ipc_client *client, const char *payload, uint32_t payload_length) {
@@ -499,13 +506,11 @@ bool ipc_send_reply(struct ipc_client *client, const char *payload, uint32_t pay
 
         if (write(client->fd, data, ipc_header_size) == -1) {
                 sway_log_errno(L_INFO, "Unable to send header to IPC client");
-                ipc_client_disconnect(client);
                 return false;
         }
 
         if (write(client->fd, payload, payload_length) == -1) {
                 sway_log_errno(L_INFO, "Unable to send payload to IPC client");
-                ipc_client_disconnect(client);
                 return false;
         }
 
@@ -654,7 +659,10 @@ void ipc_send_event(const char *json_string, enum ipc_command_type event) {
                         continue;
                 }
                 client->current_command = event;
-                ipc_send_reply(client, json_string, (uint32_t) strlen(json_string));
+                if (!ipc_send_reply(client, json_string, (uint32_t) strlen(json_string))) {
+                        sway_log_errno(L_INFO, "Unable to send reply to IPC client");
+                        ipc_client_disconnect(client);
+                }
         }
 }