src/common/sessiond-comm/sessiond-comm.h

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  *                      Julien Desfossez <julien.desfossez@polymtl.ca>
   4  *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License, version 2 only,
   8  * as 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
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 /*
  21  * This header is meant for liblttng and libust internal use ONLY. These
  22  * declarations should NOT be considered stable API.
  23  */
  24
  25 #ifndef _LTTNG_SESSIOND_COMM_H
  26 #define _LTTNG_SESSIOND_COMM_H
  27
  28 #include <limits.h>
  29 #include <lttng/lttng.h>
  30 #include <lttng/snapshot-internal.h>
  31 #include <lttng/save-internal.h>
  32 #include <lttng/channel-internal.h>
  33 #include <lttng/trigger/trigger-internal.h>
  34 #include <lttng/rotate-internal.h>
  35 #include <common/compat/socket.h>
  36 #include <common/uri.h>
  37 #include <common/defaults.h>
  38 #include <common/uuid.h>
  39 #include <common/macros.h>
  40 #include <common/optional.h>
  41
  42 #include <arpa/inet.h>
  43 #include <netinet/in.h>
  44 #include <sys/un.h>
  45
  46 #include "inet.h"
  47 #include "inet6.h"
  48 #include <common/unix.h>
  49
  50 /* Queue size of listen(2) */
  51 #define LTTNG_SESSIOND_COMM_MAX_LISTEN 64
  52
  53 /* Maximum number of FDs that can be sent over a Unix socket */
  54 #define LTTCOMM_MAX_SEND_FDS           4
  55
  56 /*
  57  * Get the error code index from 0 since LTTCOMM_OK start at 1000
  58  */
  59 #define LTTCOMM_ERR_INDEX(code) (code - LTTCOMM_CONSUMERD_COMMAND_SOCK_READY)
  60
  61 enum lttcomm_sessiond_command {
  62         /* Tracer command */
  63         LTTNG_ADD_CONTEXT                     = 0,
  64         /* LTTNG_CALIBRATE used to be here */
  65         LTTNG_DISABLE_CHANNEL                 = 2,
  66         LTTNG_DISABLE_EVENT                   = 3,
  67         LTTNG_LIST_SYSCALLS                   = 4,
  68         LTTNG_ENABLE_CHANNEL                  = 5,
  69         LTTNG_ENABLE_EVENT                    = 6,
  70         /* 7 */
  71         /* Session daemon command */
  72         /* 8 */
  73         LTTNG_DESTROY_SESSION                 = 9,
  74         LTTNG_LIST_CHANNELS                   = 10,
  75         LTTNG_LIST_DOMAINS                    = 11,
  76         LTTNG_LIST_EVENTS                     = 12,
  77         LTTNG_LIST_SESSIONS                   = 13,
  78         LTTNG_LIST_TRACEPOINTS                = 14,
  79         LTTNG_REGISTER_CONSUMER               = 15,
  80         LTTNG_START_TRACE                     = 16,
  81         LTTNG_STOP_TRACE                      = 17,
  82         LTTNG_LIST_TRACEPOINT_FIELDS          = 18,
  83
  84         /* Consumer */
  85         LTTNG_DISABLE_CONSUMER                = 19,
  86         LTTNG_ENABLE_CONSUMER                 = 20,
  87         LTTNG_SET_CONSUMER_URI                = 21,
  88         /* 22 */
  89         /* 23 */
  90         LTTNG_DATA_PENDING                    = 24,
  91         LTTNG_SNAPSHOT_ADD_OUTPUT             = 25,
  92         LTTNG_SNAPSHOT_DEL_OUTPUT             = 26,
  93         LTTNG_SNAPSHOT_LIST_OUTPUT            = 27,
  94         LTTNG_SNAPSHOT_RECORD                 = 28,
  95         /* 29 */
  96         /* 30 */
  97         LTTNG_SAVE_SESSION                    = 31,
  98         LTTNG_TRACK_PID                       = 32,
  99         LTTNG_UNTRACK_PID                     = 33,
 100         LTTNG_LIST_TRACKER_PIDS               = 34,
 101         LTTNG_SET_SESSION_SHM_PATH            = 40,
 102         LTTNG_REGENERATE_METADATA             = 41,
 103         LTTNG_REGENERATE_STATEDUMP            = 42,
 104         LTTNG_REGISTER_TRIGGER                = 43,
 105         LTTNG_UNREGISTER_TRIGGER              = 44,
 106         LTTNG_ROTATE_SESSION                  = 45,
 107         LTTNG_ROTATION_GET_INFO               = 46,
 108         LTTNG_ROTATION_SET_SCHEDULE           = 47,
 109         LTTNG_SESSION_LIST_ROTATION_SCHEDULES = 48,
 110         LTTNG_CREATE_SESSION_EXT              = 49,
 111         LTTNG_CLEAR_SESSION                   = 50,
 112 };
 113
 114 enum lttcomm_relayd_command {
 115         RELAYD_ADD_STREAM                   = 1,
 116         RELAYD_CREATE_SESSION               = 2,
 117         RELAYD_START_DATA                   = 3,
 118         RELAYD_UPDATE_SYNC_INFO             = 4,
 119         RELAYD_VERSION                      = 5,
 120         RELAYD_SEND_METADATA                = 6,
 121         RELAYD_CLOSE_STREAM                 = 7,
 122         RELAYD_DATA_PENDING                 = 8,
 123         RELAYD_QUIESCENT_CONTROL            = 9,
 124         RELAYD_BEGIN_DATA_PENDING           = 10,
 125         RELAYD_END_DATA_PENDING             = 11,
 126         RELAYD_ADD_INDEX                    = 12,
 127         RELAYD_SEND_INDEX                   = 13,
 128         RELAYD_CLOSE_INDEX                  = 14,
 129         /* Live-reading commands (2.4+). */
 130         RELAYD_LIST_SESSIONS                = 15,
 131         /* All streams of the channel have been sent to the relayd (2.4+). */
 132         RELAYD_STREAMS_SENT                 = 16,
 133         /* Ask the relay to reset the metadata trace file (2.8+) */
 134         RELAYD_RESET_METADATA               = 17,
 135         /* Ask the relay to rotate a set of stream files (2.11+) */
 136         RELAYD_ROTATE_STREAMS                = 18,
 137         /* Ask the relay to create a trace chunk (2.11+) */
 138         RELAYD_CREATE_TRACE_CHUNK           = 19,
 139         /* Ask the relay to close a trace chunk (2.11+) */
 140         RELAYD_CLOSE_TRACE_CHUNK            = 20,
 141         /* Ask the relay whether a trace chunk exists (2.11+) */
 142         RELAYD_TRACE_CHUNK_EXISTS           = 21,
 143
 144         /* Feature branch specific commands start at 10000. */
 145 };
 146
 147 /*
 148  * lttcomm error code.
 149  */
 150 enum lttcomm_return_code {
 151         LTTCOMM_CONSUMERD_SUCCESS            = 0,   /* Everything went fine. */
 152         /*
 153          * Some code paths use -1 to express an error, others
 154          * negate this consumer return code. Starting codes at
 155          * 100 ensures there is no mix-up between this error value
 156          * and legitimate status codes.
 157          */
 158         LTTCOMM_CONSUMERD_COMMAND_SOCK_READY = 100, /* Command socket ready */
 159         LTTCOMM_CONSUMERD_SUCCESS_RECV_FD,          /* Success on receiving fds */
 160         LTTCOMM_CONSUMERD_ERROR_RECV_FD,            /* Error on receiving fds */
 161         LTTCOMM_CONSUMERD_ERROR_RECV_CMD,           /* Error on receiving command */
 162         LTTCOMM_CONSUMERD_POLL_ERROR,               /* Error in polling thread */
 163         LTTCOMM_CONSUMERD_POLL_NVAL,                /* Poll on closed fd */
 164         LTTCOMM_CONSUMERD_POLL_HUP,                 /* All fds have hungup */
 165         LTTCOMM_CONSUMERD_EXIT_SUCCESS,             /* Consumerd exiting normally */
 166         LTTCOMM_CONSUMERD_EXIT_FAILURE,             /* Consumerd exiting on error */
 167         LTTCOMM_CONSUMERD_OUTFD_ERROR,              /* Error opening the tracefile */
 168         LTTCOMM_CONSUMERD_SPLICE_EBADF,             /* EBADF from splice(2) */
 169         LTTCOMM_CONSUMERD_SPLICE_EINVAL,            /* EINVAL from splice(2) */
 170         LTTCOMM_CONSUMERD_SPLICE_ENOMEM,            /* ENOMEM from splice(2) */
 171         LTTCOMM_CONSUMERD_SPLICE_ESPIPE,            /* ESPIPE from splice(2) */
 172         LTTCOMM_CONSUMERD_ENOMEM,                   /* Consumer is out of memory */
 173         LTTCOMM_CONSUMERD_ERROR_METADATA,           /* Error with metadata. */
 174         LTTCOMM_CONSUMERD_FATAL,                    /* Fatal error. */
 175         LTTCOMM_CONSUMERD_RELAYD_FAIL,              /* Error on remote relayd */
 176         LTTCOMM_CONSUMERD_CHANNEL_FAIL,             /* Channel creation failed. */
 177         LTTCOMM_CONSUMERD_CHAN_NOT_FOUND,           /* Channel not found. */
 178         LTTCOMM_CONSUMERD_ALREADY_SET,              /* Resource already set. */
 179         LTTCOMM_CONSUMERD_ROTATION_FAIL,            /* Rotation has failed. */
 180         LTTCOMM_CONSUMERD_SNAPSHOT_FAILED,          /* snapshot has failed. */
 181         LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED,/* Trace chunk creation failed. */
 182         LTTCOMM_CONSUMERD_CLOSE_TRACE_CHUNK_FAILED, /* Trace chunk creation failed. */
 183         LTTCOMM_CONSUMERD_INVALID_PARAMETERS,       /* Invalid parameters. */
 184         LTTCOMM_CONSUMERD_TRACE_CHUNK_EXISTS_LOCAL, /* Trace chunk exists on consumer daemon. */
 185         LTTCOMM_CONSUMERD_TRACE_CHUNK_EXISTS_REMOTE,/* Trace chunk exists on relay daemon. */
 186         LTTCOMM_CONSUMERD_UNKNOWN_TRACE_CHUNK,      /* Unknown trace chunk. */
 187         LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED,  /* Relayd does not accept clear command. */
 188
 189         /* MUST be last element */
 190         LTTCOMM_NR,                                             /* Last element */
 191 };
 192
 193 /* lttng socket protocol. */
 194 enum lttcomm_sock_proto {
 195         LTTCOMM_SOCK_UDP,
 196         LTTCOMM_SOCK_TCP,
 197 };
 198
 199 /*
 200  * Index in the net_families array below. Please keep in sync!
 201  */
 202 enum lttcomm_sock_domain {
 203         LTTCOMM_INET      = 0,
 204         LTTCOMM_INET6     = 1,
 205 };
 206
 207 enum lttcomm_metadata_command {
 208         LTTCOMM_METADATA_REQUEST = 1,
 209 };
 210
 211 /*
 212  * Commands sent from the consumerd to the sessiond to request if new metadata
 213  * is available. This message is used to find the per UID _or_ per PID registry
 214  * for the channel key. For per UID lookup, the triplet
 215  * bits_per_long/uid/session_id is used. On lookup failure, we search for the
 216  * per PID registry indexed by session id ignoring the other values.
 217  */
 218 struct lttcomm_metadata_request_msg {
 219         uint64_t session_id; /* Tracing session id */
 220         uint64_t session_id_per_pid; /* Tracing session id for per-pid */
 221         uint32_t bits_per_long; /* Consumer ABI */
 222         uint32_t uid;
 223         uint64_t key; /* Metadata channel key. */
 224 } LTTNG_PACKED;
 225
 226 struct lttcomm_sockaddr {
 227         enum lttcomm_sock_domain type;
 228         union {
 229                 struct sockaddr_in sin;
 230                 struct sockaddr_in6 sin6;
 231         } addr;
 232 } LTTNG_PACKED;
 233
 234 struct lttcomm_sock {
 235         int32_t fd;
 236         enum lttcomm_sock_proto proto;
 237         struct lttcomm_sockaddr sockaddr;
 238         const struct lttcomm_proto_ops *ops;
 239 } LTTNG_PACKED;
 240
 241 /*
 242  * Relayd sock. Adds the protocol version to use for the communications with
 243  * the relayd.
 244  */
 245 struct lttcomm_relayd_sock {
 246         struct lttcomm_sock sock;
 247         uint32_t major;
 248         uint32_t minor;
 249 } LTTNG_PACKED;
 250
 251 struct lttcomm_net_family {
 252         int family;
 253         int (*create) (struct lttcomm_sock *sock, int type, int proto);
 254 };
 255
 256 struct lttcomm_proto_ops {
 257         int (*bind) (struct lttcomm_sock *sock);
 258         int (*close) (struct lttcomm_sock *sock);
 259         int (*connect) (struct lttcomm_sock *sock);
 260         struct lttcomm_sock *(*accept) (struct lttcomm_sock *sock);
 261         int (*listen) (struct lttcomm_sock *sock, int backlog);
 262         ssize_t (*recvmsg) (struct lttcomm_sock *sock, void *buf, size_t len,
 263                         int flags);
 264         ssize_t (*sendmsg) (struct lttcomm_sock *sock, const void *buf,
 265                         size_t len, int flags);
 266 };
 267
 268 /*
 269  * Data structure received from lttng client to session daemon.
 270  */
 271 struct lttcomm_session_msg {
 272         uint32_t cmd_type;      /* enum lttcomm_sessiond_command */
 273         struct lttng_session session;
 274         struct lttng_domain domain;
 275         union {
 276                 /* Event data */
 277                 struct {
 278                         char channel_name[LTTNG_SYMBOL_NAME_LEN];
 279                         struct lttng_event event LTTNG_PACKED;
 280                         /* Length of following filter expression. */
 281                         uint32_t expression_len;
 282                         /* Length of following bytecode for filter. */
 283                         uint32_t bytecode_len;
 284                         /* Exclusion count (fixed-size strings). */
 285                         uint32_t exclusion_count;
 286                         /* Userspace probe location size. */
 287                         uint32_t userspace_probe_location_len;
 288                         /*
 289                          * After this structure, the following variable-length
 290                          * items are transmitted:
 291                          * - char exclusion_names[LTTNG_SYMBOL_NAME_LEN][exclusion_count]
 292                          * - char filter_expression[expression_len]
 293                          * - unsigned char filter_bytecode[bytecode_len]
 294                          */
 295                 } LTTNG_PACKED enable;
 296                 struct {
 297                         char channel_name[LTTNG_SYMBOL_NAME_LEN];
 298                         struct lttng_event event LTTNG_PACKED;
 299                         /* Length of following filter expression. */
 300                         uint32_t expression_len;
 301                         /* Length of following bytecode for filter. */
 302                         uint32_t bytecode_len;
 303                         /*
 304                          * After this structure, the following variable-length
 305                          * items are transmitted:
 306                          * - unsigned char filter_expression[expression_len]
 307                          * - unsigned char filter_bytecode[bytecode_len]
 308                          */
 309                 } LTTNG_PACKED disable;
 310                 /* Create channel */
 311                 struct {
 312                         struct lttng_channel chan LTTNG_PACKED;
 313                         /* struct lttng_channel_extended is already packed. */
 314                         struct lttng_channel_extended extended;
 315                 } LTTNG_PACKED channel;
 316                 /* Context */
 317                 struct {
 318                         char channel_name[LTTNG_SYMBOL_NAME_LEN];
 319                         struct lttng_event_context ctx LTTNG_PACKED;
 320                         uint32_t provider_name_len;
 321                         uint32_t context_name_len;
 322                 } LTTNG_PACKED context;
 323                 /* Use by register_consumer */
 324                 struct {
 325                         char path[PATH_MAX];
 326                 } LTTNG_PACKED reg;
 327                 /* List */
 328                 struct {
 329                         char channel_name[LTTNG_SYMBOL_NAME_LEN];
 330                 } LTTNG_PACKED list;
 331                 struct lttng_calibrate calibrate;
 332                 /* Used by the set_consumer_url and used by create_session also call */
 333                 struct {
 334                         /* Number of lttng_uri following */
 335                         uint32_t size;
 336                 } LTTNG_PACKED uri;
 337                 struct {
 338                         struct lttng_snapshot_output output LTTNG_PACKED;
 339                 } LTTNG_PACKED snapshot_output;
 340                 struct {
 341                         uint32_t wait;
 342                         struct lttng_snapshot_output output LTTNG_PACKED;
 343                 } LTTNG_PACKED snapshot_record;
 344                 struct {
 345                         uint32_t nb_uri;
 346                         unsigned int timer_interval;    /* usec */
 347                 } LTTNG_PACKED session_live;
 348                 struct {
 349                         struct lttng_save_session_attr attr; /* struct already packed */
 350                 } LTTNG_PACKED save_session;
 351                 struct {
 352                         char shm_path[PATH_MAX];
 353                 } LTTNG_PACKED set_shm_path;
 354                 struct {
 355                         uint32_t pid;
 356                 } LTTNG_PACKED pid_tracker;
 357                 struct {
 358                         uint32_t length;
 359                 } LTTNG_PACKED trigger;
 360                 struct {
 361                         uint64_t rotation_id;
 362                 } LTTNG_PACKED get_rotation_info;
 363                 struct {
 364                         /* enum lttng_rotation_schedule_type */
 365                         uint8_t type;
 366                         /*
 367                          * If set == 1, set schedule to value, if set == 0,
 368                          * clear this schedule type.
 369                          */
 370                         uint8_t set;
 371                         uint64_t value;
 372                 } LTTNG_PACKED rotation_set_schedule;
 373                 struct {
 374                         /*
 375                          * Includes the null-terminator.
 376                          * Must be an absolute path.
 377                          *
 378                          * Size bounded by LTTNG_PATH_MAX.
 379                          */
 380                         uint16_t home_dir_size;
 381                         uint64_t session_descriptor_size;
 382                         /* An lttng_session_descriptor follows. */
 383                 } LTTNG_PACKED create_session;
 384         } u;
 385 } LTTNG_PACKED;
 386
 387 #define LTTNG_FILTER_MAX_LEN    65536
 388 #define LTTNG_SESSION_DESCRIPTOR_MAX_LEN        65536
 389
 390 /*
 391  * Filter bytecode data. The reloc table is located at the end of the
 392  * bytecode. It is made of tuples: (uint16_t, var. len. string). It
 393  * starts at reloc_table_offset.
 394  */
 395 #define LTTNG_FILTER_PADDING    32
 396 struct lttng_filter_bytecode {
 397         uint32_t len;   /* len of data */
 398         uint32_t reloc_table_offset;
 399         uint64_t seqnum;
 400         char padding[LTTNG_FILTER_PADDING];
 401         char data[0];
 402 } LTTNG_PACKED;
 403
 404 /*
 405  * Event exclusion data. At the end of the structure, there will actually
 406  * by zero or more names, where the actual number of names is given by
 407  * the 'count' item of the structure.
 408  */
 409 #define LTTNG_EVENT_EXCLUSION_PADDING   32
 410 struct lttng_event_exclusion {
 411         uint32_t count;
 412         char padding[LTTNG_EVENT_EXCLUSION_PADDING];
 413         char names[0][LTTNG_SYMBOL_NAME_LEN];
 414 } LTTNG_PACKED;
 415
 416 #define LTTNG_EVENT_EXCLUSION_NAME_AT(_exclusion, _i) \
 417         (&(_exclusion)->names[_i][0])
 418
 419 /*
 420  * Event command header.
 421  */
 422 struct lttcomm_event_command_header {
 423         /* Number of events */
 424         uint32_t nb_events;
 425 } LTTNG_PACKED;
 426
 427 /*
 428  * Event extended info header. This is the structure preceding each
 429  * extended info data.
 430  */
 431 struct lttcomm_event_extended_header {
 432         /*
 433          * Size of filter string immediately following this header.
 434          * This size includes the terminal null character.
 435          */
 436         uint32_t filter_len;
 437
 438         /*
 439          * Number of exclusion names, immediately following the filter
 440          * string. Each exclusion name has a fixed length of
 441          * LTTNG_SYMBOL_NAME_LEN bytes, including the terminal null
 442          * character.
 443          */
 444         uint32_t nb_exclusions;
 445
 446         /*
 447          * Size of the event's userspace probe location (if applicable).
 448          */
 449         uint32_t userspace_probe_location_len;
 450 } LTTNG_PACKED;
 451
 452 /*
 453  * Command header of the reply to an LTTNG_DESTROY_SESSION command.
 454  */
 455 struct lttcomm_session_destroy_command_header {
 456         /* enum lttng_session */
 457         int32_t rotation_state;
 458 };
 459
 460 /*
 461  * Data structure for the response from sessiond to the lttng client.
 462  */
 463 struct lttcomm_lttng_msg {
 464         uint32_t cmd_type;      /* enum lttcomm_sessiond_command */
 465         uint32_t ret_code;      /* enum lttcomm_return_code */
 466         uint32_t pid;           /* pid_t */
 467         uint32_t cmd_header_size;
 468         uint32_t data_size;
 469 } LTTNG_PACKED;
 470
 471 struct lttcomm_lttng_output_id {
 472         uint32_t id;
 473 } LTTNG_PACKED;
 474
 475 /*
 476  * lttcomm_consumer_msg is the message sent from sessiond to consumerd
 477  * to either add a channel, add a stream, update a stream, or stop
 478  * operation.
 479  */
 480 struct lttcomm_consumer_msg {
 481         uint32_t cmd_type;      /* enum lttng_consumer_command */
 482         union {
 483                 struct {
 484                         uint64_t channel_key;
 485                         uint64_t session_id;
 486                         /* ID of the session's current trace chunk. */
 487                         LTTNG_OPTIONAL_COMM(uint64_t) LTTNG_PACKED chunk_id;
 488                         char pathname[PATH_MAX];
 489                         uint64_t relayd_id;
 490                         /* nb_init_streams is the number of streams open initially. */
 491                         uint32_t nb_init_streams;
 492                         char name[LTTNG_SYMBOL_NAME_LEN];
 493                         /* Use splice or mmap to consume this fd */
 494                         enum lttng_event_output output;
 495                         int type; /* Per cpu or metadata. */
 496                         uint64_t tracefile_size; /* bytes */
 497                         uint32_t tracefile_count; /* number of tracefiles */
 498                         /* If the channel's streams have to be monitored or not. */
 499                         uint32_t monitor;
 500                         /* timer to check the streams usage in live mode (usec). */
 501                         unsigned int live_timer_interval;
 502                         /* timer to sample a channel's positions (usec). */
 503                         unsigned int monitor_timer_interval;
 504                 } LTTNG_PACKED channel; /* Only used by Kernel. */
 505                 struct {
 506                         uint64_t stream_key;
 507                         uint64_t channel_key;
 508                         int32_t cpu;    /* On which CPU this stream is assigned. */
 509                         /* Tells the consumer if the stream should be or not monitored. */
 510                         uint32_t no_monitor;
 511                 } LTTNG_PACKED stream;  /* Only used by Kernel. */
 512                 struct {
 513                         uint64_t net_index;
 514                         enum lttng_stream_type type;
 515                         /* Open socket to the relayd */
 516                         struct lttcomm_relayd_sock sock;
 517                         /* Tracing session id associated to the relayd. */
 518                         uint64_t session_id;
 519                         /* Relayd session id, only used with control socket. */
 520                         uint64_t relayd_session_id;
 521                 } LTTNG_PACKED relayd_sock;
 522                 struct {
 523                         uint64_t net_seq_idx;
 524                 } LTTNG_PACKED destroy_relayd;
 525                 struct {
 526                         uint64_t session_id;
 527                 } LTTNG_PACKED data_pending;
 528                 struct {
 529                         uint64_t subbuf_size;                   /* bytes */
 530                         uint64_t num_subbuf;                    /* power of 2 */
 531                         int32_t overwrite;                      /* 1: overwrite, 0: discard */
 532                         uint32_t switch_timer_interval;         /* usec */
 533                         uint32_t read_timer_interval;           /* usec */
 534                         unsigned int live_timer_interval;       /* usec */
 535                         uint32_t monitor_timer_interval;        /* usec */
 536                         int32_t output;                         /* splice, mmap */
 537                         int32_t type;                           /* metadata or per_cpu */
 538                         uint64_t session_id;                    /* Tracing session id */
 539                         char pathname[PATH_MAX];                /* Channel file path. */
 540                         char name[LTTNG_SYMBOL_NAME_LEN];       /* Channel name. */
 541                         /* Credentials used to open the UST buffer shared mappings. */
 542                         struct {
 543                                 uint32_t uid;
 544                                 uint32_t gid;
 545                         } LTTNG_PACKED buffer_credentials;
 546                         uint64_t relayd_id;                     /* Relayd id if apply. */
 547                         uint64_t key;                           /* Unique channel key. */
 548                         /* ID of the session's current trace chunk. */
 549                         LTTNG_OPTIONAL_COMM(uint64_t) LTTNG_PACKED chunk_id;
 550                         unsigned char uuid[LTTNG_UUID_LEN];     /* uuid for ust tracer. */
 551                         uint32_t chan_id;                       /* Channel ID on the tracer side. */
 552                         uint64_t tracefile_size;        /* bytes */
 553                         uint32_t tracefile_count;       /* number of tracefiles */
 554                         uint64_t session_id_per_pid;    /* Per-pid session ID. */
 555                         /* Tells the consumer if the stream should be or not monitored. */
 556                         uint32_t monitor;
 557                         /*
 558                          * For UST per UID buffers, this is the application UID of the
 559                          * channel.  This can be different from the user UID requesting the
 560                          * channel creation and used for the rights on the stream file
 561                          * because the application can be in the tracing for instance.
 562                          */
 563                         uint32_t ust_app_uid;
 564                         int64_t blocking_timeout;
 565                         char root_shm_path[PATH_MAX];
 566                         char shm_path[PATH_MAX];
 567                 } LTTNG_PACKED ask_channel;
 568                 struct {
 569                         uint64_t key;
 570                 } LTTNG_PACKED get_channel;
 571                 struct {
 572                         uint64_t key;
 573                 } LTTNG_PACKED destroy_channel;
 574                 struct {
 575                         uint64_t key;   /* Metadata channel key. */
 576                         uint64_t target_offset; /* Offset in the consumer */
 577                         uint64_t len;   /* Length of metadata to be received. */
 578                         uint64_t version; /* Version of the metadata. */
 579                 } LTTNG_PACKED push_metadata;
 580                 struct {
 581                         uint64_t key;   /* Metadata channel key. */
 582                 } LTTNG_PACKED close_metadata;
 583                 struct {
 584                         uint64_t key;   /* Metadata channel key. */
 585                 } LTTNG_PACKED setup_metadata;
 586                 struct {
 587                         uint64_t key;   /* Channel key. */
 588                 } LTTNG_PACKED flush_channel;
 589                 struct {
 590                         uint64_t key;   /* Channel key. */
 591                 } LTTNG_PACKED clear_quiescent_channel;
 592                 struct {
 593                         char pathname[PATH_MAX];
 594                         /* Indicate if the snapshot goes on the relayd or locally. */
 595                         uint32_t use_relayd;
 596                         uint32_t metadata;              /* This a metadata snapshot. */
 597                         uint64_t relayd_id;             /* Relayd id if apply. */
 598                         uint64_t key;
 599                         uint64_t nb_packets_per_stream;
 600                 } LTTNG_PACKED snapshot_channel;
 601                 struct {
 602                         uint64_t channel_key;
 603                         uint64_t net_seq_idx;
 604                 } LTTNG_PACKED sent_streams;
 605                 struct {
 606                         uint64_t session_id;
 607                         uint64_t channel_key;
 608                 } LTTNG_PACKED discarded_events;
 609                 struct {
 610                         uint64_t session_id;
 611                         uint64_t channel_key;
 612                 } LTTNG_PACKED lost_packets;
 613                 struct {
 614                         uint64_t session_id;
 615                 } LTTNG_PACKED regenerate_metadata;
 616                 struct {
 617                         uint32_t metadata; /* This is a metadata channel. */
 618                         uint64_t relayd_id; /* Relayd id if apply. */
 619                         uint64_t key;
 620                 } LTTNG_PACKED rotate_channel;
 621                 struct {
 622                         uint64_t session_id;
 623                         uint64_t chunk_id;
 624                 } LTTNG_PACKED check_rotation_pending_local;
 625                 struct {
 626                         uint64_t relayd_id;
 627                         uint64_t session_id;
 628                         uint64_t chunk_id;
 629                 } LTTNG_PACKED check_rotation_pending_relay;
 630                 struct {
 631                         /*
 632                          * Relayd id, if applicable (remote).
 633                          *
 634                          * A directory file descriptor referring to the chunk's
 635                          * output folder is transmitted if the chunk is local
 636                          * (relayd_id unset).
 637                          *
 638                          * `override_name` is left NULL (all-zeroes) if the
 639                          * chunk's name is not overridden.
 640                          */
 641                         LTTNG_OPTIONAL_COMM(uint64_t) LTTNG_PACKED relayd_id;
 642                         char override_name[LTTNG_NAME_MAX];
 643                         uint64_t session_id;
 644                         uint64_t chunk_id;
 645                         uint64_t creation_timestamp;
 646                         LTTNG_OPTIONAL_COMM(struct {
 647                                 uint32_t uid;
 648                                 uint32_t gid;
 649                         } LTTNG_PACKED ) LTTNG_PACKED credentials;
 650                 } LTTNG_PACKED create_trace_chunk;
 651                 struct {
 652                         LTTNG_OPTIONAL_COMM(uint64_t) LTTNG_PACKED relayd_id;
 653                         uint64_t session_id;
 654                         uint64_t chunk_id;
 655                         uint64_t close_timestamp;
 656                         /* enum lttng_trace_chunk_command_type */
 657                         LTTNG_OPTIONAL_COMM(uint32_t) LTTNG_PACKED close_command;
 658                 } LTTNG_PACKED close_trace_chunk;
 659                 struct {
 660                         LTTNG_OPTIONAL_COMM(uint64_t) LTTNG_PACKED relayd_id;
 661                         uint64_t session_id;
 662                         uint64_t chunk_id;
 663                 } LTTNG_PACKED trace_chunk_exists;
 664                 struct {
 665                         lttng_uuid sessiond_uuid;
 666                 } LTTNG_PACKED init;
 667                 struct {
 668                         uint64_t key;
 669                 } LTTNG_PACKED clear_channel;
 670         } u;
 671 } LTTNG_PACKED;
 672
 673 /*
 674  * Channel monitoring message returned to the session daemon on every
 675  * monitor timer expiration.
 676  */
 677 struct lttcomm_consumer_channel_monitor_msg {
 678         /* Key of the sampled channel. */
 679         uint64_t key;
 680         /*
 681          * Lowest and highest usage (bytes) at the moment the sample was taken.
 682          */
 683         uint64_t lowest, highest;
 684         /*
 685          * Sum of all the consumed positions for a channel.
 686          */
 687         uint64_t total_consumed;
 688 } LTTNG_PACKED;
 689
 690 /*
 691  * Status message returned to the sessiond after a received command.
 692  */
 693 struct lttcomm_consumer_status_msg {
 694         enum lttcomm_return_code ret_code;
 695 } LTTNG_PACKED;
 696
 697 struct lttcomm_consumer_status_channel {
 698         enum lttcomm_return_code ret_code;
 699         uint64_t key;
 700         unsigned int stream_count;
 701 } LTTNG_PACKED;
 702
 703 struct lttcomm_consumer_close_trace_chunk_reply {
 704         enum lttcomm_return_code ret_code;
 705         uint32_t path_length;
 706         char path[];
 707 };
 708
 709 #ifdef HAVE_LIBLTTNG_UST_CTL
 710
 711 #include <lttng/ust-abi.h>
 712
 713 /*
 714  * Data structure for the commands sent from sessiond to UST.
 715  */
 716 struct lttcomm_ust_msg {
 717         uint32_t handle;
 718         uint32_t cmd;
 719         union {
 720                 struct lttng_ust_channel channel;
 721                 struct lttng_ust_stream stream;
 722                 struct lttng_ust_event event;
 723                 struct lttng_ust_context context;
 724                 struct lttng_ust_tracer_version version;
 725         } u;
 726 } LTTNG_PACKED;
 727
 728 /*
 729  * Data structure for the response from UST to the session daemon.
 730  * cmd_type is sent back in the reply for validation.
 731  */
 732 struct lttcomm_ust_reply {
 733         uint32_t handle;
 734         uint32_t cmd;
 735         uint32_t ret_code;      /* enum lttcomm_return_code */
 736         uint32_t ret_val;       /* return value */
 737         union {
 738                 struct {
 739                         uint64_t memory_map_size;
 740                 } LTTNG_PACKED channel;
 741                 struct {
 742                         uint64_t memory_map_size;
 743                 } LTTNG_PACKED stream;
 744                 struct lttng_ust_tracer_version version;
 745         } u;
 746 } LTTNG_PACKED;
 747
 748 #endif /* HAVE_LIBLTTNG_UST_CTL */
 749
 750 LTTNG_HIDDEN const char *lttcomm_get_readable_code(enum lttcomm_return_code code);
 751
 752 LTTNG_HIDDEN int lttcomm_init_inet_sockaddr(struct lttcomm_sockaddr *sockaddr,
 753                 const char *ip, unsigned int port);
 754 LTTNG_HIDDEN int lttcomm_init_inet6_sockaddr(struct lttcomm_sockaddr *sockaddr,
 755                 const char *ip, unsigned int port);
 756
 757 LTTNG_HIDDEN struct lttcomm_sock *lttcomm_alloc_sock(enum lttcomm_sock_proto proto);
 758 LTTNG_HIDDEN int lttcomm_create_sock(struct lttcomm_sock *sock);
 759 LTTNG_HIDDEN struct lttcomm_sock *lttcomm_alloc_sock_from_uri(struct lttng_uri *uri);
 760 LTTNG_HIDDEN void lttcomm_destroy_sock(struct lttcomm_sock *sock);
 761 LTTNG_HIDDEN struct lttcomm_sock *lttcomm_alloc_copy_sock(struct lttcomm_sock *src);
 762 LTTNG_HIDDEN void lttcomm_copy_sock(struct lttcomm_sock *dst,
 763                 struct lttcomm_sock *src);
 764
 765 /* Relayd socket object. */
 766 LTTNG_HIDDEN struct lttcomm_relayd_sock *lttcomm_alloc_relayd_sock(
 767                 struct lttng_uri *uri, uint32_t major, uint32_t minor);
 768
 769 LTTNG_HIDDEN int lttcomm_setsockopt_rcv_timeout(int sock, unsigned int msec);
 770 LTTNG_HIDDEN int lttcomm_setsockopt_snd_timeout(int sock, unsigned int msec);
 771
 772 LTTNG_HIDDEN int lttcomm_sock_get_port(const struct lttcomm_sock *sock,
 773                 uint16_t *port);
 774 /*
 775  * Set a port to an lttcomm_sock. This will have no effect is the socket is
 776  * already bound.
 777  */
 778 LTTNG_HIDDEN int lttcomm_sock_set_port(struct lttcomm_sock *sock, uint16_t port);
 779
 780 LTTNG_HIDDEN void lttcomm_init(void);
 781 /* Get network timeout, in milliseconds */
 782 LTTNG_HIDDEN unsigned long lttcomm_get_network_timeout(void);
 783
 784 #endif  /* _LTTNG_SESSIOND_COMM_H */