src/common/sessiond-comm/sessiond-comm.c

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2 only,
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <assert.h>
  21 #include <limits.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <sys/stat.h>
  26 #include <sys/types.h>
  27 #include <unistd.h>
  28 #include <errno.h>
  29
  30 #include <common/defaults.h>
  31 #include <common/error.h>
  32
  33 #include "sessiond-comm.h"
  34
  35 /* For Unix socket */
  36 #include "unix.h"
  37 /* For Inet socket */
  38 #include "inet.h"
  39 /* For Inet6 socket */
  40 #include "inet6.h"
  41
  42 struct lttcomm_net_family net_families[] = {
  43         { LTTCOMM_INET, lttcomm_create_inet_sock },
  44         { LTTCOMM_INET6, lttcomm_create_inet6_sock },
  45 };
  46
  47 /*
  48  * Human readable error message.
  49  */
  50 static const char *lttcomm_readable_code[] = {
  51         [ LTTCOMM_ERR_INDEX(LTTCOMM_OK) ] = "Success",
  52         [ LTTCOMM_ERR_INDEX(LTTCOMM_ERR) ] = "Unknown error",
  53         [ LTTCOMM_ERR_INDEX(LTTCOMM_UND) ] = "Undefined command",
  54         [ LTTCOMM_ERR_INDEX(LTTCOMM_NOT_IMPLEMENTED) ] = "Not implemented",
  55         [ LTTCOMM_ERR_INDEX(LTTCOMM_UNKNOWN_DOMAIN) ] = "Unknown tracing domain",
  56         [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_SESSION) ] = "No session found",
  57         [ LTTCOMM_ERR_INDEX(LTTCOMM_LIST_FAIL) ] = "Unable to list traceable apps",
  58         [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_APPS) ] = "No traceable apps found",
  59         [ LTTCOMM_ERR_INDEX(LTTCOMM_SESS_NOT_FOUND) ] = "Session name not found",
  60         [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACE) ] = "No trace found",
  61         [ LTTCOMM_ERR_INDEX(LTTCOMM_FATAL) ] = "Fatal error of the session daemon",
  62         [ LTTCOMM_ERR_INDEX(LTTCOMM_CREATE_DIR_FAIL) ] = "Create directory failed",
  63         [ LTTCOMM_ERR_INDEX(LTTCOMM_START_FAIL) ] = "Start trace failed",
  64         [ LTTCOMM_ERR_INDEX(LTTCOMM_STOP_FAIL) ] = "Stop trace failed",
  65         [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_TRACEABLE) ] = "App is not traceable",
  66         [ LTTCOMM_ERR_INDEX(LTTCOMM_SELECT_SESS) ] = "A session MUST be selected",
  67         [ LTTCOMM_ERR_INDEX(LTTCOMM_EXIST_SESS) ] = "Session name already exist",
  68         [ LTTCOMM_ERR_INDEX(LTTCOMM_CONNECT_FAIL) ] = "Unable to connect to Unix socket",
  69         [ LTTCOMM_ERR_INDEX(LTTCOMM_APP_NOT_FOUND) ] = "Application not found",
  70         [ LTTCOMM_ERR_INDEX(LTTCOMM_EPERM) ] = "Permission denied",
  71         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NA) ] = "Kernel tracer not available",
  72         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_VERSION) ] = "Kernel tracer version is not compatible",
  73         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_EVENT_EXIST) ] = "Kernel event already exists",
  74         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_SESS_FAIL) ] = "Kernel create session failed",
  75         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_EXIST) ] = "Kernel channel already exists",
  76         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_FAIL) ] = "Kernel create channel failed",
  77         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_NOT_FOUND) ] = "Kernel channel not found",
  78         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_DISABLE_FAIL) ] = "Disable kernel channel failed",
  79         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CHAN_ENABLE_FAIL) ] = "Enable kernel channel failed",
  80         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONTEXT_FAIL) ] = "Add kernel context failed",
  81         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_ENABLE_FAIL) ] = "Enable kernel event failed",
  82         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DISABLE_FAIL) ] = "Disable kernel event failed",
  83         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_META_FAIL) ] = "Opening metadata failed",
  84         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_START_FAIL) ] = "Starting kernel trace failed",
  85         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STOP_FAIL) ] = "Stoping kernel trace failed",
  86         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_CONSUMER_FAIL) ] = "Kernel consumer start failed",
  87         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_STREAM_FAIL) ] = "Kernel create stream failed",
  88         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_FAIL) ] = "Kernel trace directory creation failed",
  89         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_DIR_EXIST) ] = "Kernel trace directory already exist",
  90         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_NO_SESSION) ] = "No kernel session found",
  91         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_LIST_FAIL) ] = "Listing kernel events failed",
  92         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CALIBRATE_FAIL) ] = "UST calibration failed",
  93         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_VERSION) ] = "UST tracer version is not compatible",
  94         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_SESS_FAIL) ] = "UST create session failed",
  95         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_FAIL) ] = "UST create channel failed",
  96         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_EXIST) ] = "UST channel already exist",
  97         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_NOT_FOUND) ] = "UST channel not found",
  98         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_DISABLE_FAIL) ] = "Disable UST channel failed",
  99         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CHAN_ENABLE_FAIL) ] = "Enable UST channel failed",
 100         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_FAIL) ] = "Add UST context failed",
 101         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_ENABLE_FAIL) ] = "Enable UST event failed",
 102         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DISABLE_FAIL) ] = "Disable UST event failed",
 103         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_META_FAIL) ] = "Opening metadata failed",
 104         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_START_FAIL) ] = "Starting UST trace failed",
 105         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STOP_FAIL) ] = "Stoping UST trace failed",
 106         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER64_FAIL) ] = "64-bit UST consumer start failed",
 107         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONSUMER32_FAIL) ] = "32-bit UST consumer start failed",
 108         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_STREAM_FAIL) ] = "UST create stream failed",
 109         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_FAIL) ] = "UST trace directory creation failed",
 110         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_DIR_EXIST) ] = "UST trace directory already exist",
 111         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_NO_SESSION) ] = "No UST session found",
 112         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_LIST_FAIL) ] = "Listing UST events failed",
 113         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_EXIST) ] = "UST event already exist",
 114         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_EVENT_NOT_FOUND)] = "UST event not found",
 115         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_EXIST)] = "UST context already exist",
 116         [ LTTCOMM_ERR_INDEX(LTTCOMM_UST_CONTEXT_INVAL)] = "UST invalid context",
 117         [ LTTCOMM_ERR_INDEX(LTTCOMM_NEED_ROOT_SESSIOND) ] = "Tracing the kernel requires a root lttng-sessiond daemon and \"tracing\" group user membership",
 118         [ LTTCOMM_ERR_INDEX(LTTCOMM_TRACE_ALREADY_STARTED) ] = "Tracing already started",
 119         [ LTTCOMM_ERR_INDEX(LTTCOMM_TRACE_ALREADY_STOPPED) ] = "Tracing already stopped",
 120         [ LTTCOMM_ERR_INDEX(LTTCOMM_KERN_EVENT_ENOSYS) ] = "Kernel event type not supported",
 121
 122         [ LTTCOMM_ERR_INDEX(CONSUMERD_COMMAND_SOCK_READY) ] = "consumerd command socket ready",
 123         [ LTTCOMM_ERR_INDEX(CONSUMERD_SUCCESS_RECV_FD) ] = "consumerd success on receiving fds",
 124         [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_FD) ] = "consumerd error on receiving fds",
 125         [ LTTCOMM_ERR_INDEX(CONSUMERD_ERROR_RECV_CMD) ] = "consumerd error on receiving command",
 126         [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_ERROR) ] = "consumerd error in polling thread",
 127         [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_NVAL) ] = "consumerd polling on closed fd",
 128         [ LTTCOMM_ERR_INDEX(CONSUMERD_POLL_HUP) ] = "consumerd all fd hung up",
 129         [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_SUCCESS) ] = "consumerd exiting normally",
 130         [ LTTCOMM_ERR_INDEX(CONSUMERD_EXIT_FAILURE) ] = "consumerd exiting on error",
 131         [ LTTCOMM_ERR_INDEX(CONSUMERD_OUTFD_ERROR) ] = "consumerd error opening the tracefile",
 132         [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EBADF) ] = "consumerd splice EBADF",
 133         [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_EINVAL) ] = "consumerd splice EINVAL",
 134         [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ENOMEM) ] = "consumerd splice ENOMEM",
 135         [ LTTCOMM_ERR_INDEX(CONSUMERD_SPLICE_ESPIPE) ] = "consumerd splice ESPIPE",
 136         [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_EVENT) ] = "Event not found",
 137         [ LTTCOMM_ERR_INDEX(LTTCOMM_INVALID) ] = "Invalid parameter",
 138         [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_USTCONSUMERD) ] = "No UST consumer detected",
 139         [ LTTCOMM_ERR_INDEX(LTTCOMM_NO_KERNCONSUMERD) ] = "No kernel consumer detected",
 140         [ LTTCOMM_ERR_INDEX(LTTCOMM_EVENT_EXIST_LOGLEVEL) ] = "Event already enabled with different loglevel",
 141         [ LTTCOMM_ERR_INDEX(LTTCOMM_URI_DATA_MISS) ] = "Missing data path URI",
 142         [ LTTCOMM_ERR_INDEX(LTTCOMM_URI_CTRL_MISS) ] = "Missing control data path URI",
 143         [ LTTCOMM_ERR_INDEX(LTTCOMM_ENABLE_CONSUMER_FAIL) ] = "Enabling consumer failed",
 144         [ LTTCOMM_ERR_INDEX(LTTCOMM_RELAYD_SESSION_FAIL) ] = "Unable to create session on lttng-relayd",
 145         [ LTTCOMM_ERR_INDEX(LTTCOMM_RELAYD_VERSION_FAIL) ] = "Relay daemon not compatible",
 146         [ LTTCOMM_ERR_INDEX(LTTCOMM_FILTER_INVAL) ] = "Invalid filter bytecode",
 147         [ LTTCOMM_ERR_INDEX(LTTCOMM_FILTER_NOMEM) ] = "Not enough memory for filter bytecode",
 148         [ LTTCOMM_ERR_INDEX(LTTCOMM_FILTER_EXIST) ] = "Filter already exist",
 149 };
 150
 151 /*
 152  * Return ptr to string representing a human readable error code from the
 153  * lttcomm_return_code enum.
 154  *
 155  * These code MUST be negative in other to treat that as an error value.
 156  */
 157 const char *lttcomm_get_readable_code(enum lttcomm_return_code code)
 158 {
 159         int tmp_code = -code;
 160
 161         if (tmp_code >= LTTCOMM_OK && tmp_code < LTTCOMM_NR) {
 162                 return lttcomm_readable_code[LTTCOMM_ERR_INDEX(tmp_code)];
 163         }
 164
 165         return "Unknown error code";
 166 }
 167
 168 /*
 169  * Create socket from an already allocated lttcomm socket structure and init
 170  * sockaddr in the lttcomm sock.
 171  */
 172 int lttcomm_create_sock(struct lttcomm_sock *sock)
 173 {
 174         int ret, _sock_type, _sock_proto, domain;
 175
 176         assert(sock);
 177
 178         domain = sock->sockaddr.type;
 179         if (domain != LTTCOMM_INET && domain != LTTCOMM_INET6) {
 180                 ERR("Create socket of unknown domain %d", domain);
 181                 ret = -1;
 182                 goto error;
 183         }
 184
 185         switch (sock->proto) {
 186         case LTTCOMM_SOCK_UDP:
 187                 _sock_type = SOCK_DGRAM;
 188                 _sock_proto = IPPROTO_UDP;
 189                 break;
 190         case LTTCOMM_SOCK_TCP:
 191                 _sock_type = SOCK_STREAM;
 192                 _sock_proto = IPPROTO_TCP;
 193                 break;
 194         default:
 195                 ret = -1;
 196                 goto error;
 197         }
 198
 199         ret = net_families[domain].create(sock, _sock_type, _sock_proto);
 200         if (ret < 0) {
 201                 goto error;
 202         }
 203
 204 error:
 205         return ret;
 206 }
 207
 208 /*
 209  * Return allocated lttcomm socket structure.
 210  */
 211 struct lttcomm_sock *lttcomm_alloc_sock(enum lttcomm_sock_proto proto)
 212 {
 213         struct lttcomm_sock *sock;
 214
 215         sock = zmalloc(sizeof(struct lttcomm_sock));
 216         if (sock == NULL) {
 217                 PERROR("zmalloc create sock");
 218                 goto end;
 219         }
 220
 221         sock->proto = proto;
 222         sock->fd = -1;
 223
 224 end:
 225         return sock;
 226 }
 227
 228 /*
 229  * Return an allocated lttcomm socket structure and copy src content into
 230  * the newly created socket.
 231  *
 232  * This is mostly useful when lttcomm_sock are passed between process where the
 233  * fd and ops have to be changed within the correct address space.
 234  */
 235 struct lttcomm_sock *lttcomm_alloc_copy_sock(struct lttcomm_sock *src)
 236 {
 237         struct lttcomm_sock *sock;
 238
 239         /* Safety net */
 240         assert(src);
 241
 242         sock = lttcomm_alloc_sock(src->proto);
 243         if (sock == NULL) {
 244                 goto alloc_error;
 245         }
 246
 247         lttcomm_copy_sock(sock, src);
 248
 249 alloc_error:
 250         return sock;
 251 }
 252
 253 /*
 254  * Create and copy socket from an allocated lttcomm socket structure.
 255  *
 256  * This is mostly useful when lttcomm_sock are passed between process where the
 257  * fd and ops have to be changed within the correct address space.
 258  */
 259 void lttcomm_copy_sock(struct lttcomm_sock *dst, struct lttcomm_sock *src)
 260 {
 261         /* Safety net */
 262         assert(dst);
 263         assert(src);
 264
 265         dst->proto = src->proto;
 266         dst->fd = src->fd;
 267         dst->ops = src->ops;
 268         /* Copy sockaddr information from original socket */
 269         memcpy(&dst->sockaddr, &src->sockaddr, sizeof(dst->sockaddr));
 270 }
 271
 272 /*
 273  * Init IPv4 sockaddr structure.
 274  */
 275 int lttcomm_init_inet_sockaddr(struct lttcomm_sockaddr *sockaddr,
 276                 const char *ip, unsigned int port)
 277 {
 278         int ret;
 279
 280         assert(sockaddr);
 281         assert(ip);
 282         assert(port > 0 && port <= 65535);
 283
 284         memset(sockaddr, 0, sizeof(struct lttcomm_sockaddr));
 285
 286         sockaddr->type = LTTCOMM_INET;
 287         sockaddr->addr.sin.sin_family = AF_INET;
 288         sockaddr->addr.sin.sin_port = htons(port);
 289         ret = inet_pton(sockaddr->addr.sin.sin_family, ip,
 290                         &sockaddr->addr.sin.sin_addr);
 291         if (ret < 1) {
 292                 ret = -1;
 293                 ERR("%s with port %d: unrecognized IPv4 address", ip, port);
 294                 goto error;
 295         }
 296         memset(sockaddr->addr.sin.sin_zero, 0, sizeof(sockaddr->addr.sin.sin_zero));
 297
 298 error:
 299         return ret;
 300 }
 301
 302 /*
 303  * Init IPv6 sockaddr structure.
 304  */
 305 int lttcomm_init_inet6_sockaddr(struct lttcomm_sockaddr *sockaddr,
 306                 const char *ip, unsigned int port)
 307 {
 308         int ret;
 309
 310         assert(sockaddr);
 311         assert(ip);
 312         assert(port > 0 && port <= 65535);
 313
 314         memset(sockaddr, 0, sizeof(struct lttcomm_sockaddr));
 315
 316         sockaddr->type = LTTCOMM_INET6;
 317         sockaddr->addr.sin6.sin6_family = AF_INET6;
 318         sockaddr->addr.sin6.sin6_port = htons(port);
 319         ret = inet_pton(sockaddr->addr.sin6.sin6_family, ip,
 320                         &sockaddr->addr.sin6.sin6_addr);
 321         if (ret < 1) {
 322                 ret = -1;
 323                 goto error;
 324         }
 325
 326 error:
 327         return ret;
 328 }
 329
 330 /*
 331  * Return allocated lttcomm socket structure from lttng URI.
 332  */
 333 struct lttcomm_sock *lttcomm_alloc_sock_from_uri(struct lttng_uri *uri)
 334 {
 335         int ret;
 336         int _sock_proto;
 337         struct lttcomm_sock *sock = NULL;
 338
 339         /* Safety net */
 340         assert(uri);
 341
 342         /* Check URI protocol */
 343         if (uri->proto == LTTNG_TCP) {
 344                 _sock_proto = LTTCOMM_SOCK_TCP;
 345         } else {
 346                 ERR("Relayd invalid URI proto: %d", uri->proto);
 347                 goto alloc_error;
 348         }
 349
 350         sock = lttcomm_alloc_sock(_sock_proto);
 351         if (sock == NULL) {
 352                 goto alloc_error;
 353         }
 354
 355         /* Check destination type */
 356         if (uri->dtype == LTTNG_DST_IPV4) {
 357                 ret = lttcomm_init_inet_sockaddr(&sock->sockaddr, uri->dst.ipv4,
 358                                 uri->port);
 359                 if (ret < 0) {
 360                         goto error;
 361                 }
 362         } else if (uri->dtype == LTTNG_DST_IPV6) {
 363                 ret = lttcomm_init_inet6_sockaddr(&sock->sockaddr, uri->dst.ipv6,
 364                                 uri->port);
 365                 if (ret < 0) {
 366                         goto error;
 367                 }
 368         } else {
 369                 /* Command URI is invalid */
 370                 ERR("Relayd invalid URI dst type: %d", uri->dtype);
 371                 goto error;
 372         }
 373
 374         return sock;
 375
 376 error:
 377         lttcomm_destroy_sock(sock);
 378 alloc_error:
 379         return NULL;
 380 }
 381
 382 /*
 383  * Destroy and free lttcomm socket.
 384  */
 385 void lttcomm_destroy_sock(struct lttcomm_sock *sock)
 386 {
 387         if (sock != NULL) {
 388                 free(sock);
 389         }
 390 }