1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _LIBRESTART_H 27 #define _LIBRESTART_H 28 29 #include <libsysevent.h> 30 #include <libcontract.h> 31 #include <libscf.h> 32 #include <limits.h> 33 #include <priv.h> 34 #include <pwd.h> 35 #include <sys/types.h> 36 37 #ifdef __cplusplus 38 extern "C" { 39 #endif 40 41 /* 42 * There are 3 parts to librestart. 43 * 1) The event protocol from the master restarter to its delegates. 44 * 2) A functional interface for updating the repository. 45 * 3) Convenience functions for common restarter tasks. 46 * 47 * Event protocol 48 * We need a reliable event protocol, as there's no way to define 49 * restarter events as idempotent. 50 * 51 * Currently using sysevent channels as the reliable event implementation. 52 * This could change if the implementation proves unsuitable, but 53 * the API defined here should abstract anything but a change in 54 * the fundamental event model. 55 * 56 * We offer functions to tease apart the event rather than generic 57 * nvpair interfaces. This is because each event type has a well- 58 * defined set of fields. 59 */ 60 61 /* 62 * Some of the functions have external contracted consumers, review contracts 63 * when making incompatible changes. 64 */ 65 66 typedef struct restarter_event_handle restarter_event_handle_t; 67 typedef struct restarter_event restarter_event_t; 68 69 typedef uint32_t restarter_event_type_t; 70 71 /* 72 * Define an event protocol version. In theory, we could use this in 73 * the future to support delegated restarters which use an older 74 * protocol. In practice, increment RESTARTER_EVENT_VERSION whenever the 75 * protocol might have changed. 76 */ 77 #define RESTARTER_EVENT_VERSION 4 78 79 #define RESTARTER_FLAG_DEBUG 1 80 81 #define RESTARTER_ERRMSGSZ 1024 82 83 /* 84 * Event types 85 * RESTARTER_EVENT_TYPE_ADD_INSTANCE 86 * responsible for a new (stopped) instance 87 * RESTARTER_EVENT_TYPE_REMOVE_INSTANCE 88 * no longer responsible for this instance; stop it and return 89 * RESTARTER_EVENT_TYPE_ENABLE 90 * no guarantee that dependencies are met; see 91 * RESTARTER_EVENT_TYPE_START 92 * RESTARTER_EVENT_TYPE_DISABLE 93 * no guarantee that instance was running 94 * RESTARTER_EVENT_TYPE_ADMIN_DEGRADED 95 * RESTARTER_EVENT_TYPE_ADMIN_REFRESH 96 * RESTARTER_EVENT_TYPE_ADMIN_RESTART 97 * RESTARTER_EVENT_TYPE_ADMIN_MAINT_OFF 98 * RESTARTER_EVENT_TYPE_ADMIN_MAINT_ON 99 * RESTARTER_EVENT_TYPE_ADMIN_MAINT_ON_IMMEDIATE 100 * RESTARTER_EVENT_TYPE_ADMIN_MAINT_OFF 101 * RESTARTER_EVENT_TYPE_STOP 102 * dependencies are, or are becoming, unsatisfied 103 * RESTARTER_EVENT_TYPE_START 104 * dependencies have become satisfied 105 * RESTARTER_EVENT_TYPE_DEPENDENCY_CYCLE 106 * instance caused a dependency cycle 107 * RESTARTER_EVENT_TYPE_INVALID_DEPENDENCY 108 * instance has an invalid dependency 109 */ 110 111 #define RESTARTER_EVENT_TYPE_INVALID 0 112 #define RESTARTER_EVENT_TYPE_ADD_INSTANCE 1 113 #define RESTARTER_EVENT_TYPE_REMOVE_INSTANCE 2 114 #define RESTARTER_EVENT_TYPE_ENABLE 3 115 #define RESTARTER_EVENT_TYPE_DISABLE 4 116 #define RESTARTER_EVENT_TYPE_ADMIN_DEGRADED 5 117 #define RESTARTER_EVENT_TYPE_ADMIN_REFRESH 6 118 #define RESTARTER_EVENT_TYPE_ADMIN_RESTART 7 119 #define RESTARTER_EVENT_TYPE_ADMIN_MAINT_OFF 8 120 #define RESTARTER_EVENT_TYPE_ADMIN_MAINT_ON 9 121 #define RESTARTER_EVENT_TYPE_ADMIN_MAINT_ON_IMMEDIATE 10 122 #define RESTARTER_EVENT_TYPE_STOP 11 123 #define RESTARTER_EVENT_TYPE_START 12 124 #define RESTARTER_EVENT_TYPE_DEPENDENCY_CYCLE 13 125 #define RESTARTER_EVENT_TYPE_INVALID_DEPENDENCY 14 126 #define RESTARTER_EVENT_TYPE_ADMIN_DISABLE 15 127 #define RESTARTER_EVENT_TYPE_STOP_RESET 16 128 129 #define RESTARTER_EVENT_ERROR -1 130 131 #define RESTARTER_EVENT_INSTANCE_DISABLED 0 132 #define RESTARTER_EVENT_INSTANCE_ENABLED 1 133 134 typedef enum { 135 RESTARTER_STATE_NONE, 136 RESTARTER_STATE_UNINIT, 137 RESTARTER_STATE_MAINT, 138 RESTARTER_STATE_OFFLINE, 139 RESTARTER_STATE_DISABLED, 140 RESTARTER_STATE_ONLINE, 141 RESTARTER_STATE_DEGRADED 142 } restarter_instance_state_t; 143 144 /* 145 * These values are ordered by severity of required restart, as we use 146 * integer comparisons to determine error flow. 147 */ 148 typedef enum { 149 RERR_UNSUPPORTED = -1, 150 RERR_NONE = 0, /* no error, restart, refresh */ 151 RERR_FAULT, /* fault occurred */ 152 RERR_RESTART, /* transition due to restart */ 153 RERR_REFRESH /* transition due to refresh */ 154 } restarter_error_t; 155 /* 156 * restarter_store_contract() and restarter_remove_contract() types 157 */ 158 typedef enum { 159 RESTARTER_CONTRACT_PRIMARY, 160 RESTARTER_CONTRACT_TRANSIENT 161 } restarter_contract_type_t; 162 163 /* 164 * restarter_bind_handle() registers a delegate with svc.startd to 165 * begin consuming events. 166 * 167 * On initial bind, the delgated restarter receives an event for each 168 * instance it is responsible for, as if that instance was new. 169 * 170 * callers must have superuser privileges 171 * 172 * The event handler can return 0 for success, or EAGAIN to request 173 * retry of event delivery. EAGAIN may be returned 3 times before the 174 * event is discarded. 175 */ 176 int restarter_bind_handle(uint32_t, const char *, 177 int (*event_handler)(restarter_event_t *), int, 178 restarter_event_handle_t **); 179 180 restarter_event_type_t restarter_event_get_type(restarter_event_t *); 181 uint64_t restarter_event_get_seq(restarter_event_t *); 182 void restarter_event_get_time(restarter_event_t *, hrtime_t *); 183 ssize_t restarter_event_get_instance(restarter_event_t *, char *, size_t); 184 restarter_event_handle_t *restarter_event_get_handle(restarter_event_t *); 185 186 /* 187 * The following functions work only on certain types of events. 188 * They fail with a return of -1 if they're called on an inappropriate event. 189 */ 190 int restarter_event_get_enabled(restarter_event_t *); 191 int restarter_event_get_current_states(restarter_event_t *, 192 restarter_instance_state_t *, restarter_instance_state_t *); 193 194 /* 195 * Functions for updating the repository. 196 */ 197 198 /* 199 * When setting state to "maintenance", callers of restarter_set_states() can 200 * set aux_state to "service_request" to communicate that another service has 201 * requested maintenance state for the target service. 202 * 203 * Callers should use restarter_inst_validate_aux_fmri() to validate the fmri 204 * of the requested service and pass "service_request" for aux_state when 205 * calling restarter_set_states(). See inetd and startd for examples. 206 */ 207 int restarter_set_states(restarter_event_handle_t *, const char *, 208 restarter_instance_state_t, restarter_instance_state_t, 209 restarter_instance_state_t, restarter_instance_state_t, restarter_error_t, 210 const char *); 211 int restarter_event_publish_retry(evchan_t *, const char *, const char *, 212 const char *, const char *, nvlist_t *, uint32_t); 213 214 int restarter_store_contract(scf_instance_t *, ctid_t, 215 restarter_contract_type_t); 216 int restarter_remove_contract(scf_instance_t *, ctid_t, 217 restarter_contract_type_t); 218 219 ssize_t restarter_state_to_string(restarter_instance_state_t, char *, size_t); 220 restarter_instance_state_t restarter_string_to_state(char *); 221 222 #define RESTARTER_METHOD_CONTEXT_VERSION 7 223 224 struct method_context { 225 /* Stable */ 226 uid_t uid, euid; 227 gid_t gid, egid; 228 int ngroups; /* -1 means use initgroups(). */ 229 gid_t groups[NGROUPS_MAX]; 230 priv_set_t *lpriv_set, *priv_set; 231 char *corefile_pattern; /* Optional. */ 232 char *project; /* NULL for no change */ 233 char *resource_pool; /* NULL for project default */ 234 char *working_dir; /* NULL for :default */ 235 char **env; /* NULL for no env */ 236 size_t env_sz; /* size of env array */ 237 238 /* Private */ 239 char *vbuf; 240 ssize_t vbuf_sz; 241 struct passwd pwd; 242 char *pwbuf; 243 ssize_t pwbufsz; 244 }; 245 246 /* 247 * An error structure that contains a message string, and a type 248 * that can be used to determine course of action by the reciever 249 * of the error structure. 250 * 251 * type - usually will be an errno equivalent but could contain 252 * defined error types for exampe SCF_ERROR_XXX 253 * msg - must be at the end of the structure as if the message is 254 * longer than EMSGSIZE we will reallocate the structure to 255 * handle the overflow 256 */ 257 typedef struct mc_error { 258 int destroy; /* Flag to indicate destruction steps */ 259 int type; /* Type of error for decision making */ 260 int size; /* The size of the error message string */ 261 char msg[RESTARTER_ERRMSGSZ]; 262 } mc_error_t; 263 264 int restarter_rm_libs_loadable(void); 265 /* instance, restarter name, method name, command line, structure pointer */ 266 mc_error_t *restarter_get_method_context(uint_t, scf_instance_t *, 267 scf_snapshot_t *, const char *, const char *, struct method_context **); 268 void restarter_mc_error_destroy(mc_error_t *); 269 int restarter_set_method_context(struct method_context *, const char **); 270 void restarter_free_method_context(struct method_context *); 271 272 273 int restarter_is_null_method(const char *); 274 int restarter_is_kill_method(const char *); 275 int restarter_is_kill_proc_method(const char *); 276 277 /* Validate the inst fmri specified in restarter_actions/auxiliary_fmri */ 278 int restarter_inst_validate_ractions_aux_fmri(scf_instance_t *); 279 280 /* Delete instance's restarter_actions/auxiliary_fmri property */ 281 int restarter_inst_reset_ractions_aux_fmri(scf_instance_t *); 282 283 /* Get boolean value from instance's restarter_actions/auxiliary_tty */ 284 int restarter_inst_ractions_from_tty(scf_instance_t *); 285 286 /* Delete instance's restarter/auxiliary_fmri property */ 287 int restarter_inst_reset_aux_fmri(scf_instance_t *); 288 289 /* 290 * Set instance's restarter/auxiliary_fmri, value come from 291 * restarter_actions/auxliary_fmri 292 */ 293 int restarter_inst_set_aux_fmri(scf_instance_t *); 294 295 #ifdef __cplusplus 296 } 297 #endif 298 299 #endif /* _LIBRESTART_H */ 300