src/bin/lttng-sessiond/context.c

   1 /*
   2  * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
   3  * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   4  *
   5  * SPDX-License-Identifier: GPL-2.0-only
   6  *
   7  */
   8
   9 #define _LGPL_SOURCE
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <unistd.h>
  14 #include <urcu/list.h>
  15
  16 #include <common/error.h>
  17 #include <common/sessiond-comm/sessiond-comm.h>
  18
  19 #include "context.h"
  20 #include "kernel.h"
  21 #include "ust-app.h"
  22 #include "trace-ust.h"
  23 #include "agent.h"
  24
  25 /*
  26  * Add kernel context to all channel.
  27  *
  28  * Assumes the ownership of kctx.
  29  */
  30 static int add_kctx_all_channels(struct ltt_kernel_session *ksession,
  31                 struct ltt_kernel_context *kctx)
  32 {
  33         int ret;
  34         struct ltt_kernel_channel *kchan;
  35
  36         assert(ksession);
  37         assert(kctx);
  38
  39         DBG("Adding kernel context to all channels");
  40
  41         /* Go over all channels */
  42         cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
  43                 struct ltt_kernel_context *kctx_copy;
  44
  45                 kctx_copy = trace_kernel_copy_context(kctx);
  46                 if (!kctx_copy) {
  47                         PERROR("zmalloc ltt_kernel_context");
  48                         ret = -LTTNG_ERR_NOMEM;
  49                         goto error;
  50                 }
  51
  52                 /* Ownership of kctx_copy is transferred to the callee. */
  53                 ret = kernel_add_channel_context(kchan, kctx_copy);
  54                 kctx_copy = NULL;
  55                 if (ret != 0) {
  56                         goto error;
  57                 }
  58         }
  59
  60         ret = LTTNG_OK;
  61
  62 error:
  63         trace_kernel_destroy_context(kctx);
  64         return ret;
  65 }
  66
  67 /*
  68  * Add kernel context to a specific channel.
  69  *
  70  * Assumes the ownership of kctx.
  71  */
  72 static int add_kctx_to_channel(struct ltt_kernel_context *kctx,
  73                 struct ltt_kernel_channel *kchan)
  74 {
  75         int ret;
  76
  77         assert(kchan);
  78         assert(kctx);
  79
  80         DBG("Add kernel context to channel '%s'", kchan->channel->name);
  81
  82         /* Ownership of kctx is transferred to the callee. */
  83         ret = kernel_add_channel_context(kchan, kctx);
  84         kctx = NULL;
  85         if (ret != 0) {
  86                 goto error;
  87         }
  88
  89         ret = LTTNG_OK;
  90
  91 error:
  92         return ret;
  93 }
  94
  95 /*
  96  * Add UST context to channel.
  97  */
  98 static int add_uctx_to_channel(struct ltt_ust_session *usess,
  99                 enum lttng_domain_type domain,
 100                 struct ltt_ust_channel *uchan,
 101                 const struct lttng_event_context *ctx)
 102 {
 103         int ret;
 104         struct ltt_ust_context *uctx = NULL;
 105
 106         assert(usess);
 107         assert(uchan);
 108         assert(ctx);
 109
 110         /* Check if context is duplicate */
 111         cds_list_for_each_entry(uctx, &uchan->ctx_list, list) {
 112                 if (trace_ust_match_context(uctx, ctx)) {
 113                         ret = LTTNG_ERR_UST_CONTEXT_EXIST;
 114                         goto duplicate;
 115                 }
 116         }
 117         uctx = NULL;
 118
 119         switch (domain) {
 120         case LTTNG_DOMAIN_JUL:
 121         case LTTNG_DOMAIN_LOG4J:
 122         {
 123                 struct agent *agt;
 124
 125                 if (ctx->ctx != LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
 126                         /* Other contexts are not needed by the agent. */
 127                         break;
 128                 }
 129                 agt = trace_ust_find_agent(usess, domain);
 130
 131                 if (!agt) {
 132                         agt = agent_create(domain);
 133                         if (!agt) {
 134                                 ret = -LTTNG_ERR_NOMEM;
 135                                 goto error;
 136                         }
 137                         agent_add(agt, usess->agents);
 138                 }
 139                 ret = agent_add_context(ctx, agt);
 140                 if (ret != LTTNG_OK) {
 141                         goto error;
 142                 }
 143
 144                 ret = agent_enable_context(ctx, domain);
 145                 if (ret != LTTNG_OK) {
 146                         goto error;
 147                 }
 148                 break;
 149         }
 150         case LTTNG_DOMAIN_UST:
 151                 break;
 152         default:
 153                 assert(0);
 154         }
 155
 156         /* Create ltt UST context */
 157         uctx = trace_ust_create_context(ctx);
 158         if (uctx == NULL) {
 159                 ret = LTTNG_ERR_UST_CONTEXT_INVAL;
 160                 goto error;
 161         }
 162
 163         /* Add ltt UST context node to ltt UST channel */
 164         lttng_ht_add_ulong(uchan->ctx, &uctx->node);
 165         cds_list_add_tail(&uctx->list, &uchan->ctx_list);
 166
 167         if (!usess->active) {
 168                 goto end;
 169         }
 170
 171         ret = ust_app_add_ctx_channel_glb(usess, uchan, uctx);
 172         if (ret < 0) {
 173                 goto error;
 174         }
 175 end:
 176         DBG("Context UST %d added to channel %s", uctx->ctx.ctx, uchan->name);
 177
 178         return 0;
 179
 180 error:
 181         free(uctx);
 182 duplicate:
 183         return ret;
 184 }
 185
 186 /*
 187  * Add kernel context to tracer.
 188  */
 189 int context_kernel_add(struct ltt_kernel_session *ksession,
 190                 const struct lttng_event_context *ctx, char *channel_name)
 191 {
 192         int ret;
 193         struct ltt_kernel_channel *kchan;
 194         struct ltt_kernel_context *kctx;
 195
 196         assert(ksession);
 197         assert(ctx);
 198         assert(channel_name);
 199
 200         kctx = trace_kernel_create_context(NULL);
 201         if (!kctx) {
 202                 ret = -LTTNG_ERR_NOMEM;
 203                 goto error;
 204         }
 205
 206         /* Setup kernel context structure */
 207         switch (ctx->ctx) {
 208         case LTTNG_EVENT_CONTEXT_PID:
 209                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PID;
 210                 break;
 211         case LTTNG_EVENT_CONTEXT_PROCNAME:
 212                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PROCNAME;
 213                 break;
 214         case LTTNG_EVENT_CONTEXT_PRIO:
 215                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PRIO;
 216                 break;
 217         case LTTNG_EVENT_CONTEXT_NICE:
 218                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_NICE;
 219                 break;
 220         case LTTNG_EVENT_CONTEXT_VPID:
 221                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPID;
 222                 break;
 223         case LTTNG_EVENT_CONTEXT_TID:
 224                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_TID;
 225                 break;
 226         case LTTNG_EVENT_CONTEXT_VTID:
 227                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VTID;
 228                 break;
 229         case LTTNG_EVENT_CONTEXT_PPID:
 230                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PPID;
 231                 break;
 232         case LTTNG_EVENT_CONTEXT_VPPID:
 233                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VPPID;
 234                 break;
 235         case LTTNG_EVENT_CONTEXT_HOSTNAME:
 236                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_HOSTNAME;
 237                 break;
 238         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
 239         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
 240                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER;
 241                 break;
 242         case LTTNG_EVENT_CONTEXT_INTERRUPTIBLE:
 243                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_INTERRUPTIBLE;
 244                 break;
 245         case LTTNG_EVENT_CONTEXT_PREEMPTIBLE:
 246                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PREEMPTIBLE;
 247                 break;
 248         case LTTNG_EVENT_CONTEXT_NEED_RESCHEDULE:
 249                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_NEED_RESCHEDULE;
 250                 break;
 251         case LTTNG_EVENT_CONTEXT_MIGRATABLE:
 252                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_MIGRATABLE;
 253                 break;
 254         case LTTNG_EVENT_CONTEXT_CALLSTACK_KERNEL:
 255                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_CALLSTACK_KERNEL;
 256                 break;
 257         case LTTNG_EVENT_CONTEXT_CALLSTACK_USER:
 258                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_CALLSTACK_USER;
 259                 break;
 260         case LTTNG_EVENT_CONTEXT_CGROUP_NS:
 261                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_CGROUP_NS;
 262                 break;
 263         case LTTNG_EVENT_CONTEXT_IPC_NS:
 264                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_IPC_NS;
 265                 break;
 266         case LTTNG_EVENT_CONTEXT_MNT_NS:
 267                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_MNT_NS;
 268                 break;
 269         case LTTNG_EVENT_CONTEXT_NET_NS:
 270                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_NET_NS;
 271                 break;
 272         case LTTNG_EVENT_CONTEXT_PID_NS:
 273                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PID_NS;
 274                 break;
 275         case LTTNG_EVENT_CONTEXT_USER_NS:
 276                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_USER_NS;
 277                 break;
 278         case LTTNG_EVENT_CONTEXT_UTS_NS:
 279                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_UTS_NS;
 280                 break;
 281         case LTTNG_EVENT_CONTEXT_UID:
 282                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_UID;
 283                 break;
 284         case LTTNG_EVENT_CONTEXT_EUID:
 285                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_EUID;
 286                 break;
 287         case LTTNG_EVENT_CONTEXT_SUID:
 288                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_SUID;
 289                 break;
 290         case LTTNG_EVENT_CONTEXT_GID:
 291                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_GID;
 292                 break;
 293         case LTTNG_EVENT_CONTEXT_EGID:
 294                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_EGID;
 295                 break;
 296         case LTTNG_EVENT_CONTEXT_SGID:
 297                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_SGID;
 298                 break;
 299         case LTTNG_EVENT_CONTEXT_VUID:
 300                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VUID;
 301                 break;
 302         case LTTNG_EVENT_CONTEXT_VEUID:
 303                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VEUID;
 304                 break;
 305         case LTTNG_EVENT_CONTEXT_VSUID:
 306                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VSUID;
 307                 break;
 308         case LTTNG_EVENT_CONTEXT_VGID:
 309                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VGID;
 310                 break;
 311         case LTTNG_EVENT_CONTEXT_VEGID:
 312                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VEGID;
 313                 break;
 314         case LTTNG_EVENT_CONTEXT_VSGID:
 315                 kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_VSGID;
 316                 break;
 317         default:
 318                 ret = LTTNG_ERR_KERN_CONTEXT_FAIL;
 319                 goto error;
 320         }
 321
 322         kctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type;
 323         kctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config;
 324         strncpy(kctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name,
 325                         LTTNG_SYMBOL_NAME_LEN);
 326         kctx->ctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
 327
 328         if (*channel_name == '\0') {
 329                 ret = add_kctx_all_channels(ksession, kctx);
 330                 /* Ownership of kctx is transferred to the callee. */
 331                 kctx = NULL;
 332                 if (ret != LTTNG_OK) {
 333                         goto error;
 334                 }
 335         } else {
 336                 /* Get kernel channel */
 337                 kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
 338                 if (kchan == NULL) {
 339                         ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
 340                         goto error;
 341                 }
 342
 343                 ret = add_kctx_to_channel(kctx, kchan);
 344                 /* Ownership of kctx is transferred to the callee. */
 345                 kctx = NULL;
 346                 if (ret != LTTNG_OK) {
 347                         goto error;
 348                 }
 349         }
 350
 351         ret = LTTNG_OK;
 352
 353 error:
 354         if (kctx) {
 355                 trace_kernel_destroy_context(kctx);
 356         }
 357         return ret;
 358 }
 359
 360 /*
 361  * Add UST context to tracer.
 362  */
 363 int context_ust_add(struct ltt_ust_session *usess,
 364                 enum lttng_domain_type domain,
 365                 const struct lttng_event_context *ctx,
 366                 char *channel_name)
 367 {
 368         int ret = LTTNG_OK;
 369         struct lttng_ht_iter iter;
 370         struct lttng_ht *chan_ht;
 371         struct ltt_ust_channel *uchan = NULL;
 372
 373         assert(usess);
 374         assert(ctx);
 375         assert(channel_name);
 376
 377         rcu_read_lock();
 378
 379         chan_ht = usess->domain_global.channels;
 380
 381         /* Get UST channel if defined */
 382         if (channel_name[0] != '\0') {
 383                 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
 384                 if (uchan == NULL) {
 385                         ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
 386                         goto error;
 387                 }
 388         }
 389
 390         if (uchan) {
 391                 /* Add ctx to channel */
 392                 ret = add_uctx_to_channel(usess, domain, uchan, ctx);
 393         } else {
 394                 rcu_read_lock();
 395                 /* Add ctx all events, all channels */
 396                 cds_lfht_for_each_entry(chan_ht->ht, &iter.iter, uchan, node.node) {
 397                         ret = add_uctx_to_channel(usess, domain, uchan, ctx);
 398                         if (ret) {
 399                                 ERR("Failed to add context to channel %s",
 400                                                 uchan->name);
 401                                 continue;
 402                         }
 403                 }
 404                 rcu_read_unlock();
 405         }
 406
 407         switch (ret) {
 408         case LTTNG_ERR_UST_CONTEXT_EXIST:
 409                 break;
 410         case -ENOMEM:
 411         case -LTTNG_ERR_NOMEM:
 412                 ret = LTTNG_ERR_FATAL;
 413                 break;
 414         case -EINVAL:
 415                 ret = LTTNG_ERR_UST_CONTEXT_INVAL;
 416                 break;
 417         case -ENOSYS:
 418                 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
 419                 break;
 420         default:
 421                 if (ret != 0 && ret != LTTNG_OK) {
 422                         ret = ret > 0 ? ret : LTTNG_ERR_UNK;
 423                 } else {
 424                         ret = LTTNG_OK;
 425                 }
 426                 break;
 427         }
 428
 429 error:
 430         rcu_read_unlock();
 431         return ret;
 432 }