sessiond: notification: use lttng_payload for communications
[lttng-tools.git] / src / lib / lttng-ctl / channel.c
index 16bd298be330e4dfcbc274326c22825669fd5346..a4e910e1d93db1b02b35f75824ddfb7f714cf5a1 100644 (file)
@@ -14,6 +14,9 @@
 #include <common/dynamic-buffer.h>
 #include <common/utils.h>
 #include <common/defaults.h>
+#include <common/payload.h>
+#include <common/payload-view.h>
+#include <common/unix.h>
 #include <assert.h>
 #include "lttng-ctl-helper.h"
 #include <common/compat/poll.h>
@@ -31,10 +34,7 @@ int receive_message(struct lttng_notification_channel *channel)
        ssize_t ret;
        struct lttng_notification_channel_message msg;
 
-       if (lttng_dynamic_buffer_set_size(&channel->reception_buffer, 0)) {
-               ret = -1;
-               goto end;
-       }
+       lttng_payload_clear(&channel->reception_payload);
 
        ret = lttcomm_recv_unix_sock(channel->socket, &msg, sizeof(msg));
        if (ret <= 0) {
@@ -48,33 +48,41 @@ int receive_message(struct lttng_notification_channel *channel)
        }
 
        /* Add message header at buffer's start. */
-       ret = lttng_dynamic_buffer_append(&channel->reception_buffer, &msg,
+       ret = lttng_dynamic_buffer_append(&channel->reception_payload.buffer, &msg,
                        sizeof(msg));
        if (ret) {
                goto error;
        }
 
        /* Reserve space for the payload. */
-       ret = lttng_dynamic_buffer_set_size(&channel->reception_buffer,
-                       channel->reception_buffer.size + msg.size);
+       ret = lttng_dynamic_buffer_set_size(&channel->reception_payload.buffer,
+                       channel->reception_payload.buffer.size + msg.size);
        if (ret) {
                goto error;
        }
 
        /* Receive message payload. */
        ret = lttcomm_recv_unix_sock(channel->socket,
-                       channel->reception_buffer.data + sizeof(msg), msg.size);
+                       channel->reception_payload.buffer.data + sizeof(msg), msg.size);
        if (ret < (ssize_t) msg.size) {
                ret = -1;
                goto error;
        }
+
+       /* Receive message fds. */
+       if (msg.fds != 0) {
+               ret = lttcomm_recv_payload_fds_unix_sock(channel->socket,
+                               msg.fds, &channel->reception_payload);
+               if (ret < sizeof(int) * msg.fds) {
+                       ret = -1;
+                       goto error;
+               }
+       }
        ret = 0;
 end:
        return ret;
 error:
-       if (lttng_dynamic_buffer_set_size(&channel->reception_buffer, 0)) {
-               ret = -1;
-       }
+       lttng_payload_clear(&channel->reception_payload);
        goto end;
 }
 
@@ -84,10 +92,10 @@ enum lttng_notification_channel_message_type get_current_message_type(
 {
        struct lttng_notification_channel_message *msg;
 
-       assert(channel->reception_buffer.size >= sizeof(*msg));
+       assert(channel->reception_payload.buffer.size >= sizeof(*msg));
 
        msg = (struct lttng_notification_channel_message *)
-                       channel->reception_buffer.data;
+                       channel->reception_payload.buffer.data;
        return (enum lttng_notification_channel_message_type) msg->type;
 }
 
@@ -98,14 +106,14 @@ struct lttng_notification *create_notification_from_current_message(
        ssize_t ret;
        struct lttng_notification *notification = NULL;
 
-       if (channel->reception_buffer.size <=
+       if (channel->reception_payload.buffer.size <=
                        sizeof(struct lttng_notification_channel_message)) {
                goto end;
        }
 
        {
-               struct lttng_payload_view view = lttng_payload_view_from_dynamic_buffer(
-                               &channel->reception_buffer,
+               struct lttng_payload_view view = lttng_payload_view_from_payload(
+                               &channel->reception_payload,
                                sizeof(struct lttng_notification_channel_message),
                                -1);
 
@@ -113,7 +121,7 @@ struct lttng_notification *create_notification_from_current_message(
                                &view, &notification);
        }
 
-       if (ret != channel->reception_buffer.size -
+       if (ret != channel->reception_payload.buffer.size -
                        sizeof(struct lttng_notification_channel_message)) {
                lttng_notification_destroy(notification);
                notification = NULL;
@@ -147,7 +155,7 @@ struct lttng_notification_channel *lttng_notification_channel_create(
        }
        channel->socket = -1;
        pthread_mutex_init(&channel->lock, NULL);
-       lttng_dynamic_buffer_init(&channel->reception_buffer);
+       lttng_payload_init(&channel->reception_payload);
        CDS_INIT_LIST_HEAD(&channel->pending_notifications.list);
 
        is_root = (getuid() == 0);
@@ -520,7 +528,7 @@ int receive_command_reply(struct lttng_notification_channel *channel,
                        struct lttng_notification_channel_command_handshake *handshake;
 
                        handshake = (struct lttng_notification_channel_command_handshake *)
-                                       (channel->reception_buffer.data +
+                                       (channel->reception_payload.buffer.data +
                                        sizeof(struct lttng_notification_channel_message));
                        channel->version.major = handshake->major;
                        channel->version.minor = handshake->minor;
@@ -534,7 +542,7 @@ int receive_command_reply(struct lttng_notification_channel *channel,
        }
 
 exit_loop:
-       if (channel->reception_buffer.size <
+       if (channel->reception_payload.buffer.size <
                        (sizeof(struct lttng_notification_channel_message) +
                        sizeof(*reply))) {
                /* Invalid message received. */
@@ -543,7 +551,7 @@ exit_loop:
        }
 
        reply = (struct lttng_notification_channel_command_reply *)
-                       (channel->reception_buffer.data +
+                       (channel->reception_payload.buffer.data +
                        sizeof(struct lttng_notification_channel_message));
        *status = (enum lttng_notification_channel_status) reply->status;
 end:
@@ -625,6 +633,7 @@ enum lttng_notification_channel_status send_condition_command(
 
        pthread_mutex_lock(&channel->lock);
        socket = channel->socket;
+
        if (!lttng_condition_validate(condition)) {
                status = LTTNG_NOTIFICATION_CHANNEL_STATUS_INVALID;
                goto end_unlock;
@@ -647,11 +656,33 @@ enum lttng_notification_channel_status send_condition_command(
        ((struct lttng_notification_channel_message *) payload.buffer.data)->size =
                        (uint32_t) (payload.buffer.size - sizeof(cmd_header));
 
-       ret = lttcomm_send_unix_sock(
-                       socket, payload.buffer.data, payload.buffer.size);
-       if (ret < 0) {
-               status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ERROR;
-               goto end_unlock;
+       {
+               struct lttng_payload_view pv =
+                               lttng_payload_view_from_payload(
+                                               &payload, 0, -1);
+               const int fd_count =
+                               lttng_payload_view_get_fd_handle_count(&pv);
+
+               /* Update fd count. */
+               ((struct lttng_notification_channel_message *) payload.buffer.data)->fds =
+                       (uint32_t) fd_count;
+
+               ret = lttcomm_send_unix_sock(
+                       socket, pv.buffer.data, pv.buffer.size);
+               if (ret < 0) {
+                       status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ERROR;
+                       goto end_unlock;
+               }
+
+               /* Pass fds if present. */
+               if (fd_count > 0) {
+                       ret = lttcomm_send_payload_view_fds_unix_sock(socket,
+                                       &pv);
+                       if (ret < 0) {
+                               status = LTTNG_NOTIFICATION_CHANNEL_STATUS_ERROR;
+                               goto end_unlock;
+                       }
+               }
        }
 
        ret = receive_command_reply(channel, &status);
@@ -695,6 +726,6 @@ void lttng_notification_channel_destroy(
                (void) lttcomm_close_unix_sock(channel->socket);
        }
        pthread_mutex_destroy(&channel->lock);
-       lttng_dynamic_buffer_reset(&channel->reception_buffer);
+       lttng_payload_reset(&channel->reception_payload);
        free(channel);
 }
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