Commit | Line | Data |
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58eb9381 DG |
1 | /* |
2 | * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
7591bab1 | 4 | * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
58eb9381 DG |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License, version 2 only, as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
17 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
6c1c0768 | 20 | #define _LGPL_SOURCE |
58eb9381 | 21 | #include <common/common.h> |
7591bab1 | 22 | #include <urcu/rculist.h> |
58eb9381 DG |
23 | |
24 | #include "connection.h" | |
25 | #include "stream.h" | |
7591bab1 | 26 | #include "viewer-session.h" |
58eb9381 | 27 | |
7591bab1 | 28 | bool connection_get(struct relay_connection *conn) |
58eb9381 | 29 | { |
7591bab1 | 30 | bool has_ref = false; |
58eb9381 | 31 | |
7591bab1 MD |
32 | pthread_mutex_lock(&conn->reflock); |
33 | if (conn->ref.refcount != 0) { | |
34 | has_ref = true; | |
35 | urcu_ref_get(&conn->ref); | |
36 | } | |
37 | pthread_mutex_unlock(&conn->reflock); | |
38 | ||
39 | return has_ref; | |
58eb9381 DG |
40 | } |
41 | ||
7591bab1 MD |
42 | struct relay_connection *connection_get_by_sock(struct lttng_ht *relay_connections_ht, |
43 | int sock) | |
58eb9381 DG |
44 | { |
45 | struct lttng_ht_node_ulong *node; | |
46 | struct lttng_ht_iter iter; | |
47 | struct relay_connection *conn = NULL; | |
48 | ||
58eb9381 DG |
49 | assert(sock >= 0); |
50 | ||
7591bab1 MD |
51 | rcu_read_lock(); |
52 | lttng_ht_lookup(relay_connections_ht, (void *)((unsigned long) sock), | |
53 | &iter); | |
58eb9381 DG |
54 | node = lttng_ht_iter_get_node_ulong(&iter); |
55 | if (!node) { | |
56 | DBG2("Relay connection by sock %d not found", sock); | |
57 | goto end; | |
58 | } | |
59 | conn = caa_container_of(node, struct relay_connection, sock_n); | |
7591bab1 MD |
60 | if (!connection_get(conn)) { |
61 | conn = NULL; | |
62 | } | |
58eb9381 | 63 | end: |
7591bab1 | 64 | rcu_read_unlock(); |
58eb9381 DG |
65 | return conn; |
66 | } | |
67 | ||
44a2fbf1 JG |
68 | int connection_reset_protocol_state(struct relay_connection *connection) |
69 | { | |
70 | int ret = 0; | |
71 | ||
72 | switch (connection->type) { | |
73 | case RELAY_DATA: | |
74 | connection->protocol.data.state_id = | |
75 | DATA_CONNECTION_STATE_RECEIVE_HEADER; | |
76 | memset(&connection->protocol.data.state.receive_header, | |
77 | 0, | |
78 | sizeof(connection->protocol.data.state.receive_header)); | |
79 | connection->protocol.data.state.receive_header.left_to_receive = | |
80 | sizeof(struct lttcomm_relayd_data_hdr); | |
81 | break; | |
82 | case RELAY_CONTROL: | |
83 | connection->protocol.ctrl.state_id = | |
84 | CTRL_CONNECTION_STATE_RECEIVE_HEADER; | |
85 | memset(&connection->protocol.ctrl.state.receive_header, | |
86 | 0, | |
87 | sizeof(connection->protocol.ctrl.state.receive_header)); | |
88 | connection->protocol.data.state.receive_header.left_to_receive = | |
89 | sizeof(struct lttcomm_relayd_hdr); | |
90 | ret = lttng_dynamic_buffer_set_size( | |
91 | &connection->protocol.ctrl.reception_buffer, | |
92 | sizeof(struct lttcomm_relayd_hdr)); | |
93 | if (ret) { | |
94 | ERR("Failed to reinitialize control connection reception buffer size to %zu bytes.", sizeof(struct lttcomm_relayd_hdr)); | |
95 | goto end; | |
96 | } | |
97 | break; | |
98 | default: | |
99 | goto end; | |
100 | } | |
101 | DBG("Reset communication state of relay connection (fd = %i)", | |
102 | connection->sock->fd); | |
103 | end: | |
104 | return ret; | |
105 | } | |
106 | ||
7591bab1 MD |
107 | struct relay_connection *connection_create(struct lttcomm_sock *sock, |
108 | enum connection_type type) | |
58eb9381 | 109 | { |
7591bab1 | 110 | struct relay_connection *conn; |
58eb9381 | 111 | |
7591bab1 MD |
112 | conn = zmalloc(sizeof(*conn)); |
113 | if (!conn) { | |
114 | PERROR("zmalloc relay connection"); | |
115 | goto end; | |
116 | } | |
117 | pthread_mutex_init(&conn->reflock, NULL); | |
118 | urcu_ref_init(&conn->ref); | |
119 | conn->type = type; | |
120 | conn->sock = sock; | |
121 | lttng_ht_node_init_ulong(&conn->sock_n, (unsigned long) conn->sock->fd); | |
44a2fbf1 JG |
122 | if (conn->type == RELAY_CONTROL) { |
123 | lttng_dynamic_buffer_init(&conn->protocol.ctrl.reception_buffer); | |
124 | } | |
125 | connection_reset_protocol_state(conn); | |
7591bab1 MD |
126 | end: |
127 | return conn; | |
58eb9381 DG |
128 | } |
129 | ||
7591bab1 | 130 | static void rcu_free_connection(struct rcu_head *head) |
58eb9381 | 131 | { |
7591bab1 MD |
132 | struct relay_connection *conn = |
133 | caa_container_of(head, struct relay_connection, rcu_node); | |
58eb9381 | 134 | |
7591bab1 MD |
135 | lttcomm_destroy_sock(conn->sock); |
136 | if (conn->viewer_session) { | |
137 | viewer_session_destroy(conn->viewer_session); | |
138 | conn->viewer_session = NULL; | |
139 | } | |
140 | free(conn); | |
141 | } | |
142 | ||
143 | static void destroy_connection(struct relay_connection *conn) | |
144 | { | |
58eb9381 DG |
145 | call_rcu(&conn->rcu_node, rcu_free_connection); |
146 | } | |
147 | ||
7591bab1 | 148 | static void connection_release(struct urcu_ref *ref) |
58eb9381 | 149 | { |
7591bab1 MD |
150 | struct relay_connection *conn = |
151 | caa_container_of(ref, struct relay_connection, ref); | |
58eb9381 | 152 | |
7591bab1 MD |
153 | if (conn->in_socket_ht) { |
154 | struct lttng_ht_iter iter; | |
155 | int ret; | |
156 | ||
157 | iter.iter.node = &conn->sock_n.node; | |
158 | ret = lttng_ht_del(conn->socket_ht, &iter); | |
159 | assert(!ret); | |
58eb9381 DG |
160 | } |
161 | ||
7591bab1 MD |
162 | if (conn->session) { |
163 | if (session_close(conn->session)) { | |
164 | ERR("session_close"); | |
165 | } | |
166 | conn->session = NULL; | |
167 | } | |
168 | if (conn->viewer_session) { | |
169 | viewer_session_close(conn->viewer_session); | |
170 | } | |
171 | destroy_connection(conn); | |
58eb9381 DG |
172 | } |
173 | ||
7591bab1 | 174 | void connection_put(struct relay_connection *conn) |
58eb9381 | 175 | { |
7591bab1 MD |
176 | rcu_read_lock(); |
177 | pthread_mutex_lock(&conn->reflock); | |
178 | urcu_ref_put(&conn->ref, connection_release); | |
179 | pthread_mutex_unlock(&conn->reflock); | |
180 | rcu_read_unlock(); | |
58eb9381 DG |
181 | } |
182 | ||
7591bab1 MD |
183 | void connection_ht_add(struct lttng_ht *relay_connections_ht, |
184 | struct relay_connection *conn) | |
58eb9381 | 185 | { |
7591bab1 MD |
186 | assert(!conn->in_socket_ht); |
187 | lttng_ht_add_unique_ulong(relay_connections_ht, &conn->sock_n); | |
188 | conn->in_socket_ht = 1; | |
189 | conn->socket_ht = relay_connections_ht; | |
58eb9381 | 190 | } |
44a2fbf1 JG |
191 | |
192 | int connection_set_session(struct relay_connection *conn, | |
193 | struct relay_session *session) | |
194 | { | |
195 | int ret = 0; | |
196 | ||
197 | assert(conn); | |
198 | assert(session); | |
199 | assert(!conn->session); | |
200 | ||
201 | if (connection_get(conn)) { | |
202 | if (session_get(session)) { | |
203 | conn->session = session; | |
204 | } else { | |
205 | ERR("Failed to get session reference in connection_set_session()"); | |
206 | ret = -1; | |
207 | } | |
208 | connection_put(conn); | |
209 | } else { | |
210 | ERR("Failed to get connection reference in connection_set_session()"); | |
211 | ret = -1; | |
212 | } | |
213 | return ret; | |
214 | } |