![[bottom]](../icons/bottom.png){kind=icon}
![[previous]](../icons/n_left.png){kind=icon}
![[next]](../icons/n_right.png){kind=icon}
![[first]](../icons/n_first.png){kind=icon}
![[last]](../icons/n_last.png){kind=icon}
![[top]](../icons/n_top.png){kind=icon}
![[index]](../icons/index.png){kind=icon}
![[help]](../icons/help.png){kind=icon}
*/
1 /*
2 * Copyright 2004-2024 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 PCMK__CRM_COMMON_IPC__H
11 #define PCMK__CRM_COMMON_IPC__H
12
13
14 #include <sys/uio.h>
15 #include <qb/qbipcc.h>
16 #include <crm/common/xml.h>
17
18 #ifdef __cplusplus
19 extern "C" {
20 #endif
21
22 /**
23 * \file
24 * \brief IPC interface to Pacemaker daemons
25 *
26 * \ingroup core
27 */
28
29 /*
30 * The library supports two methods of creating IPC connections. The older code
31 * allows connecting to any arbitrary IPC name. The newer code only allows
32 * connecting to one of the Pacemaker daemons.
33 *
34 * As daemons are converted to use the new model, the old functions should be
35 * considered deprecated for use with those daemons. Once all daemons are
36 * converted, the old functions should be officially deprecated as public API
37 * and eventually made internal API.
38 */
39
40 /*
41 * Pacemaker daemon IPC
42 */
43
44 /* @COMPAT This is also used internally for cluster message types, but it's not
45 * worth the hassle of redefining this public API just to change the name.
46 */
47 //! Available IPC interfaces
48 enum pcmk_ipc_server {
49 pcmk_ipc_unknown, //!< Unknown or invalid
50 pcmk_ipc_attrd, //!< Attribute manager
51 pcmk_ipc_based, //!< CIB manager
52 pcmk_ipc_controld, //!< Controller
53 pcmk_ipc_execd, //!< Executor
54 pcmk_ipc_fenced, //!< Fencer
55 pcmk_ipc_pacemakerd, //!< Launcher
56 pcmk_ipc_schedulerd, //!< Scheduler
57 };
58
59 // NOTE: sbd (as of at least 1.5.2) uses this enum
60 //! Possible event types that an IPC event callback can be called for
61 enum pcmk_ipc_event {
62 pcmk_ipc_event_connect, //!< Result of asynchronous connection attempt
63
64 // NOTE: sbd (as of at least 1.5.2) uses this value
65 pcmk_ipc_event_disconnect, //!< Termination of IPC connection
66
67 // NOTE: sbd (as of at least 1.5.2) uses this value
68 pcmk_ipc_event_reply, //!< Daemon's reply to client IPC request
69
70 pcmk_ipc_event_notify, //!< Notification from daemon
71 };
72
73 //! How IPC replies should be dispatched
74 enum pcmk_ipc_dispatch {
75 pcmk_ipc_dispatch_main, //!< Attach IPC to GMainLoop for dispatch
76 pcmk_ipc_dispatch_poll, //!< Caller will poll and dispatch IPC
77 pcmk_ipc_dispatch_sync, //!< Sending a command will wait for any reply
78 };
79
80 // NOTE: sbd (as of at least 1.5.2) uses this
81 //! Client connection to Pacemaker IPC
82 typedef struct pcmk_ipc_api_s pcmk_ipc_api_t;
83
84 /*!
85 * \brief Callback function type for Pacemaker daemon IPC APIs
86 *
87 * \param[in,out] api IPC API connection
88 * \param[in] event_type The type of event that occurred
89 * \param[in] status Event status
90 * \param[in,out] event_data Event-specific data
91 * \param[in,out] user_data Caller data provided when callback was registered
92 *
93 * \note For connection and disconnection events, event_data may be NULL (for
94 * local IPC) or the name of the connected node (for remote IPC, for
95 * daemons that support that). For reply and notify events, event_data is
96 * defined by the specific daemon API.
97 */
98 typedef void (*pcmk_ipc_callback_t)(pcmk_ipc_api_t *api,
99 enum pcmk_ipc_event event_type,
100 crm_exit_t status,
101 void *event_data, void *user_data);
102
103 // NOTE: sbd (as of at least 1.5.2) uses this
104 int pcmk_new_ipc_api(pcmk_ipc_api_t **api, enum pcmk_ipc_server server);
105
106 // NOTE: sbd (as of at least 1.5.2) uses this
107 void pcmk_free_ipc_api(pcmk_ipc_api_t *api);
108
109 // NOTE: sbd (as of at least 1.5.2) uses this
110 int pcmk_connect_ipc(pcmk_ipc_api_t *api, enum pcmk_ipc_dispatch dispatch_type);
111
112 void pcmk_disconnect_ipc(pcmk_ipc_api_t *api);
113
114 int pcmk_poll_ipc(const pcmk_ipc_api_t *api, int timeout_ms);
115
116 void pcmk_dispatch_ipc(pcmk_ipc_api_t *api);
117
118 // NOTE: sbd (as of at least 1.5.2) uses this
119 void pcmk_register_ipc_callback(pcmk_ipc_api_t *api, pcmk_ipc_callback_t cb,
120 void *user_data);
121
122 const char *pcmk_ipc_name(const pcmk_ipc_api_t *api, bool for_log);
123
124 bool pcmk_ipc_is_connected(pcmk_ipc_api_t *api);
125
126 int pcmk_ipc_purge_node(pcmk_ipc_api_t *api, const char *node_name,
127 uint32_t nodeid);
128
129
130 /*
131 * Generic IPC API (to eventually be deprecated as public API and made internal)
132 */
133
134 /* *INDENT-OFF* */
135 enum crm_ipc_flags
136 {
137 crm_ipc_flags_none = 0x00000000,
138
139 crm_ipc_compressed = 0x00000001, /* Message has been compressed */
140
141 crm_ipc_proxied = 0x00000100, /* _ALL_ replies to proxied connections need to be sent as events */
142 crm_ipc_client_response = 0x00000200, /* A Response is expected in reply */
143
144 // These are options for Pacemaker's internal use only (pcmk__ipc_send_*())
145 crm_ipc_server_event = 0x00010000, /* Send an Event instead of a Response */
146 crm_ipc_server_free = 0x00020000, /* Free the iovec after sending */
147 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.*/
148 };
149 /* *INDENT-ON* */
150
151 typedef struct crm_ipc_s crm_ipc_t;
152
153 crm_ipc_t *crm_ipc_new(const char *name, size_t max_size);
154 void crm_ipc_close(crm_ipc_t * client);
155 void crm_ipc_destroy(crm_ipc_t * client);
156 void pcmk_free_ipc_event(struct iovec *event);
157
158 int crm_ipc_send(crm_ipc_t *client, const xmlNode *message,
159 enum crm_ipc_flags flags, int32_t ms_timeout, xmlNode **reply);
160
161 int crm_ipc_get_fd(crm_ipc_t * client);
162 bool crm_ipc_connected(crm_ipc_t * client);
163 int crm_ipc_ready(crm_ipc_t * client);
164 long crm_ipc_read(crm_ipc_t * client);
165 const char *crm_ipc_buffer(crm_ipc_t * client);
166 uint32_t crm_ipc_buffer_flags(crm_ipc_t * client);
167 const char *crm_ipc_name(crm_ipc_t * client);
168 unsigned int crm_ipc_default_buffer_size(void);
169
170 /*!
171 * \brief Check the authenticity of the IPC socket peer process (legacy)
172 *
173 * If everything goes well, peer's authenticity is verified by the means
174 * of comparing against provided referential UID and GID (either satisfies),
175 * and the result of this check can be deduced from the return value.
176 * As an exception, detected UID of 0 ("root") satisfies arbitrary
177 * provided referential daemon's credentials.
178 *
179 * \param[in] sock IPC related, connected Unix socket to check peer of
180 * \param[in] refuid referential UID to check against
181 * \param[in] refgid referential GID to check against
182 * \param[out] gotpid to optionally store obtained PID of the peer
183 * (not available on FreeBSD, special value of 1
184 * used instead, and the caller is required to
185 * special case this value respectively)
186 * \param[out] gotuid to optionally store obtained UID of the peer
187 * \param[out] gotgid to optionally store obtained GID of the peer
188 *
189 * \return 0 if IPC related socket's peer is not authentic given the
190 * referential credentials (see above), 1 if it is,
191 * negative value on error (generally expressing -errno unless
192 * it was zero even on nonhappy path, -pcmk_err_generic is
193 * returned then; no message is directly emitted)
194 *
195 * \note While this function is tolerant on what constitutes authorized
196 * IPC daemon process (its effective user matches UID=0 or \p refuid,
197 * or at least its group matches \p refgid), either or both (in case
198 * of UID=0) mismatches on the expected credentials of such peer
199 * process \e shall be investigated at the caller when value of 1
200 * gets returned there, since higher-than-expected privileges in
201 * respect to the expected/intended credentials possibly violate
202 * the least privilege principle and may pose an additional risk
203 * (i.e. such accidental inconsistency shall be eventually fixed).
204 */
205 int crm_ipc_is_authentic_process(int sock, uid_t refuid, gid_t refgid,
206 pid_t *gotpid, uid_t *gotuid, gid_t *gotgid);
207
208 #ifdef __cplusplus
209 }
210 #endif
211
212 #endif
![[top]](../icons/top.png){kind=icon}
![[bottom]](../icons/n_bottom.png){kind=icon}
*/