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*/
1 /*
2 * Copyright 2004-2020 the Pacemaker project contributors
3 *
4 * The version control history for this file may have further details.
5 *
6 * This source code is licensed under the GNU Lesser General Public License
7 * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
8 */
9
10 #ifndef CRM_COMMON_IPC__H
11 # define CRM_COMMON_IPC__H
12
13 #ifdef __cplusplus
14 extern "C" {
15 #endif
16
17 /**
18 * \file
19 * \brief IPC interface to Pacemaker daemons
20 *
21 * \ingroup core
22 */
23
24 #include <sys/uio.h>
25 #include <qb/qbipcc.h>
26 #include <crm/common/xml.h>
27
28 /*
29 * Message creation utilities
30 *
31 * These are used for both IPC messages and cluster layer messages. However,
32 * since this is public API, they stay in this header for backward
33 * compatibility.
34 */
35
36 #define create_reply(request, xml_response_data) \
37 create_reply_adv(request, xml_response_data, __func__)
38
39 xmlNode *create_reply_adv(xmlNode *request, xmlNode *xml_response_data,
40 const char *origin);
41
42 #define create_request(task, xml_data, host_to, sys_to, sys_from, uuid_from) \
43 create_request_adv(task, xml_data, host_to, sys_to, sys_from, uuid_from, \
44 __func__)
45
46 xmlNode *create_request_adv(const char *task, xmlNode *xml_data,
47 const char *host_to, const char *sys_to,
48 const char *sys_from, const char *uuid_from,
49 const char *origin);
50
51
52 /*
53 * The library supports two methods of creating IPC connections. The older code
54 * allows connecting to any arbitrary IPC name. The newer code only allows
55 * connecting to one of the Pacemaker daemons.
56 *
57 * As daemons are converted to use the new model, the old functions should be
58 * considered deprecated for use with those daemons. Once all daemons are
59 * converted, the old functions should be officially deprecated as public API
60 * and eventually made internal API.
61 */
62
63 /*
64 * Pacemaker daemon IPC
65 */
66
67 //! Available IPC interfaces
68 enum pcmk_ipc_server {
69 pcmk_ipc_attrd, //!< Attribute manager
70 pcmk_ipc_based, //!< CIB manager
71 pcmk_ipc_controld, //!< Controller
72 pcmk_ipc_execd, //!< Executor
73 pcmk_ipc_fenced, //!< Fencer
74 pcmk_ipc_pacemakerd, //!< Launcher
75 pcmk_ipc_schedulerd, //!< Scheduler
76 };
77
78 //! Possible event types that an IPC event callback can be called for
79 enum pcmk_ipc_event {
80 pcmk_ipc_event_connect, //!< Result of asynchronous connection attempt
81 pcmk_ipc_event_disconnect, //!< Termination of IPC connection
82 pcmk_ipc_event_reply, //!< Daemon's reply to client IPC request
83 pcmk_ipc_event_notify, //!< Notification from daemon
84 };
85
86 //! How IPC replies should be dispatched
87 enum pcmk_ipc_dispatch {
88 pcmk_ipc_dispatch_main, //!< Attach IPC to GMainLoop for dispatch
89 pcmk_ipc_dispatch_poll, //!< Caller will poll and dispatch IPC
90 pcmk_ipc_dispatch_sync, //!< Sending a command will wait for any reply
91 };
92
93 //! Client connection to Pacemaker IPC
94 typedef struct pcmk_ipc_api_s pcmk_ipc_api_t;
95
96 /*!
97 * \brief Callback function type for Pacemaker daemon IPC APIs
98 *
99 * \param[in] api IPC API connection
100 * \param[in] event_type The type of event that occurred
101 * \param[in] status Event status
102 * \param[in] event_data Event-specific data
103 * \param[in] user_data Caller data provided when callback was registered
104 *
105 * \note For connection and disconnection events, event_data may be NULL (for
106 * local IPC) or the name of the connected node (for remote IPC, for
107 * daemons that support that). For reply and notify events, event_data is
108 * defined by the specific daemon API.
109 */
110 typedef void (*pcmk_ipc_callback_t)(pcmk_ipc_api_t *api,
111 enum pcmk_ipc_event event_type,
112 crm_exit_t status,
113 void *event_data, void *user_data);
114
115 int pcmk_new_ipc_api(pcmk_ipc_api_t **api, enum pcmk_ipc_server server);
116
117 void pcmk_free_ipc_api(pcmk_ipc_api_t *api);
118
119 int pcmk_connect_ipc(pcmk_ipc_api_t *api, enum pcmk_ipc_dispatch dispatch_type);
120
121 void pcmk_disconnect_ipc(pcmk_ipc_api_t *api);
122
123 int pcmk_poll_ipc(pcmk_ipc_api_t *api, int timeout_ms);
124
125 void pcmk_dispatch_ipc(pcmk_ipc_api_t *api);
126
127 void pcmk_register_ipc_callback(pcmk_ipc_api_t *api, pcmk_ipc_callback_t cb,
128 void *user_data);
129
130 const char *pcmk_ipc_name(pcmk_ipc_api_t *api, bool for_log);
131
132 bool pcmk_ipc_is_connected(pcmk_ipc_api_t *api);
133
134 int pcmk_ipc_purge_node(pcmk_ipc_api_t *api, const char *node_name,
135 uint32_t nodeid);
136
137
138 /*
139 * Generic IPC API (to eventually be deprecated as public API and made internal)
140 */
141
142 /* *INDENT-OFF* */
143 enum crm_ipc_flags
144 {
145 crm_ipc_flags_none = 0x00000000,
146
147 crm_ipc_compressed = 0x00000001, /* Message has been compressed */
148
149 crm_ipc_proxied = 0x00000100, /* _ALL_ replies to proxied connections need to be sent as events */
150 crm_ipc_client_response = 0x00000200, /* A Response is expected in reply */
151
152 // These are options for Pacemaker's internal use only (pcmk__ipc_send_*())
153 crm_ipc_server_event = 0x00010000, /* Send an Event instead of a Response */
154 crm_ipc_server_free = 0x00020000, /* Free the iovec after sending */
155 crm_ipc_proxied_relay_response = 0x00040000, /* all replies to proxied connections are sent as events, this flag preserves whether the event should be treated as an actual event, or a response.*/
156
157 crm_ipc_server_info = 0x00100000, /* Log failures as LOG_INFO */
158 crm_ipc_server_error = 0x00200000, /* Log failures as LOG_ERR */
159 };
160 /* *INDENT-ON* */
161
162 typedef struct crm_ipc_s crm_ipc_t;
163
164 crm_ipc_t *crm_ipc_new(const char *name, size_t max_size);
165 bool crm_ipc_connect(crm_ipc_t * client);
166 void crm_ipc_close(crm_ipc_t * client);
167 void crm_ipc_destroy(crm_ipc_t * client);
168 void pcmk_free_ipc_event(struct iovec *event);
169
170 int crm_ipc_send(crm_ipc_t * client, xmlNode * message, enum crm_ipc_flags flags,
171 int32_t ms_timeout, xmlNode ** reply);
172
173 int crm_ipc_get_fd(crm_ipc_t * client);
174 bool crm_ipc_connected(crm_ipc_t * client);
175 int crm_ipc_ready(crm_ipc_t * client);
176 long crm_ipc_read(crm_ipc_t * client);
177 const char *crm_ipc_buffer(crm_ipc_t * client);
178 uint32_t crm_ipc_buffer_flags(crm_ipc_t * client);
179 const char *crm_ipc_name(crm_ipc_t * client);
180 unsigned int crm_ipc_default_buffer_size(void);
181
182 /*!
183 * \brief Check the authenticity of the IPC socket peer process
184 *
185 * If everything goes well, peer's authenticity is verified by the means
186 * of comparing against provided referential UID and GID (either satisfies),
187 * and the result of this check can be deduced from the return value.
188 * As an exception, detected UID of 0 ("root") satisfies arbitrary
189 * provided referential daemon's credentials.
190 *
191 * \param[in] sock IPC related, connected Unix socket to check peer of
192 * \param[in] refuid referential UID to check against
193 * \param[in] refgid referential GID to check against
194 * \param[out] gotpid to optionally store obtained PID of the peer
195 * (not available on FreeBSD, special value of 1
196 * used instead, and the caller is required to
197 * special case this value respectively)
198 * \param[out] gotuid to optionally store obtained UID of the peer
199 * \param[out] gotgid to optionally store obtained GID of the peer
200 *
201 * \return 0 if IPC related socket's peer is not authentic given the
202 * referential credentials (see above), 1 if it is,
203 * negative value on error (generally expressing -errno unless
204 * it was zero even on nonhappy path, -pcmk_err_generic is
205 * returned then; no message is directly emitted)
206 *
207 * \note While this function is tolerant on what constitutes authorized
208 * IPC daemon process (its effective user matches UID=0 or \p refuid,
209 * or at least its group matches \p refgid), either or both (in case
210 * of UID=0) mismatches on the expected credentials of such peer
211 * process \e shall be investigated at the caller when value of 1
212 * gets returned there, since higher-than-expected privileges in
213 * respect to the expected/intended credentials possibly violate
214 * the least privilege principle and may pose an additional risk
215 * (i.e. such accidental inconsistency shall be eventually fixed).
216 */
217 int crm_ipc_is_authentic_process(int sock, uid_t refuid, gid_t refgid,
218 pid_t *gotpid, uid_t *gotuid, gid_t *gotgid);
219
220 /* This is controller-specific but is declared in this header for C API
221 * backward compatibility.
222 */
223 xmlNode *create_hello_message(const char *uuid, const char *client_name,
224 const char *major_version, const char *minor_version);
225
226 #ifdef __cplusplus
227 }
228 #endif
229
230 #endif
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*/