src/common/relayd/relayd.c

   1 /*
   2  * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License, version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 51
  15  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <assert.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/stat.h>
  24
  25 #include <common/common.h>
  26 #include <common/defaults.h>
  27 #include <common/sessiond-comm/relayd.h>
  28
  29 #include "relayd.h"
  30
  31 /*
  32  * Send command. Fill up the header and append the data.
  33  */
  34 static int send_command(struct lttcomm_sock *sock,
  35                 enum lttcomm_sessiond_command cmd, void *data, size_t size,
  36                 int flags)
  37 {
  38         int ret;
  39         struct lttcomm_relayd_hdr header;
  40         char *buf;
  41         uint64_t buf_size = sizeof(header);
  42
  43         if (data) {
  44                 buf_size += size;
  45         }
  46
  47         buf = zmalloc(buf_size);
  48         if (buf == NULL) {
  49                 PERROR("zmalloc relayd send command buf");
  50                 ret = -1;
  51                 goto alloc_error;
  52         }
  53
  54         header.cmd = htobe32(cmd);
  55         header.data_size = htobe64(size);
  56
  57         /* Zeroed for now since not used. */
  58         header.cmd_version = 0;
  59         header.circuit_id = 0;
  60
  61         /* Prepare buffer to send. */
  62         memcpy(buf, &header, sizeof(header));
  63         if (data) {
  64                 memcpy(buf + sizeof(header), data, size);
  65         }
  66
  67         ret = sock->ops->sendmsg(sock, buf, buf_size, flags);
  68         if (ret < 0) {
  69                 goto error;
  70         }
  71
  72         DBG3("Relayd sending command %d", cmd);
  73
  74 error:
  75         free(buf);
  76 alloc_error:
  77         return ret;
  78 }
  79
  80 /*
  81  * Receive reply data on socket. This MUST be call after send_command or else
  82  * could result in unexpected behavior(s).
  83  */
  84 static int recv_reply(struct lttcomm_sock *sock, void *data, size_t size)
  85 {
  86         int ret;
  87
  88         DBG3("Relayd waiting for reply...");
  89
  90         ret = sock->ops->recvmsg(sock, data, size, 0);
  91         if (ret < 0) {
  92                 goto error;
  93         }
  94
  95 error:
  96         return ret;
  97 }
  98
  99 #if 0
 100 /*
 101  * Create session on the relayd.
 102  *
 103  * On error, return ret_code negative value else return 0.
 104  */
 105 int relayd_create_session(struct lttcomm_sock *sock, const char *hostname,
 106                 const char *session_name)
 107 {
 108         int ret;
 109         struct lttcomm_relayd_create_session msg;
 110         struct lttcomm_relayd_generic_reply reply;
 111
 112         /* Code flow error. Safety net. */
 113         assert(sock);
 114         assert(hostname);
 115         assert(session_name);
 116
 117         DBG("Relayd creating session for hostname %s and session name %s",
 118                         hostname, session_name);
 119
 120         strncpy(msg.hostname, hostname, sizeof(msg.hostname));
 121         strncpy(msg.session_name, session_name, sizeof(msg.session_name));
 122
 123         /* Send command */
 124         ret = send_command(sock, RELAYD_CREATE_SESSION, (void *) &msg,
 125                         sizeof(msg), 0);
 126         if (ret < 0) {
 127                 goto error;
 128         }
 129
 130         /* Recevie response */
 131         ret = recv_reply(sock, (void *) &reply, sizeof(reply));
 132         if (ret < 0) {
 133                 goto error;
 134         }
 135
 136         /* Return session id or negative ret code. */
 137         if (reply.ret_code != LTTCOMM_OK) {
 138                 ret = -reply.ret_code;
 139         } else {
 140                 /* Success */
 141                 ret = 0;
 142         }
 143
 144         DBG2("Relayd created session for %s", session_name);
 145
 146 error:
 147         return ret;
 148 }
 149 #endif
 150
 151 /*
 152  * Add stream on the relayd and assign stream handle to the stream_id argument.
 153  *
 154  * On success return 0 else return ret_code negative value.
 155  */
 156 int relayd_add_stream(struct lttcomm_sock *sock, const char *channel_name,
 157                 const char *pathname, uint64_t *stream_id)
 158 {
 159         int ret;
 160         struct lttcomm_relayd_add_stream msg;
 161         struct lttcomm_relayd_status_stream reply;
 162
 163         /* Code flow error. Safety net. */
 164         assert(sock);
 165         assert(channel_name);
 166         assert(pathname);
 167
 168         DBG("Relayd adding stream for channel name %s", channel_name);
 169
 170         strncpy(msg.channel_name, channel_name, sizeof(msg.channel_name));
 171         strncpy(msg.pathname, pathname, sizeof(msg.pathname));
 172
 173         /* Send command */
 174         ret = send_command(sock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0);
 175         if (ret < 0) {
 176                 goto error;
 177         }
 178
 179         /* Recevie response */
 180         ret = recv_reply(sock, (void *) &reply, sizeof(reply));
 181         if (ret < 0) {
 182                 goto error;
 183         }
 184
 185         /* Back to host bytes order. */
 186         reply.handle = be64toh(reply.handle);
 187         reply.ret_code = be32toh(reply.ret_code);
 188
 189         /* Return session id or negative ret code. */
 190         if (reply.ret_code != LTTCOMM_OK) {
 191                 ret = -reply.ret_code;
 192                 ERR("Relayd add stream replied error %d", ret);
 193         } else {
 194                 /* Success */
 195                 ret = 0;
 196                 *stream_id = reply.handle;
 197         }
 198
 199         DBG("Relayd stream added successfully with handle %zu", reply.handle);
 200
 201 error:
 202         return ret;
 203 }
 204
 205 /*
 206  * Check version numbers on the relayd.
 207  *
 208  * Return 0 if compatible else negative value.
 209  */
 210 int relayd_version_check(struct lttcomm_sock *sock, uint32_t major,
 211                 uint32_t minor)
 212 {
 213         int ret;
 214         struct lttcomm_relayd_version reply;
 215
 216         /* Code flow error. Safety net. */
 217         assert(sock);
 218
 219         DBG("Relayd version check for major.minor %u.%u", major, minor);
 220
 221         /* Send command */
 222         ret = send_command(sock, RELAYD_VERSION, NULL, 0, 0);
 223         if (ret < 0) {
 224                 goto error;
 225         }
 226
 227         /* Recevie response */
 228         ret = recv_reply(sock, (void *) &reply, sizeof(reply));
 229         if (ret < 0) {
 230                 goto error;
 231         }
 232
 233         /* Set back to host bytes order */
 234         reply.major = be32toh(reply.major);
 235         reply.minor = be32toh(reply.minor);
 236
 237         /* Validate version */
 238         if (reply.major <= major) {
 239                 if (reply.minor <= minor) {
 240                         /* Compatible */
 241                         ret = 0;
 242                         DBG2("Relayd version is compatible");
 243                         goto error;
 244                 }
 245         }
 246
 247         /* Version number not compatible */
 248         DBG2("Relayd version is NOT compatible %u.%u > %u.%u", reply.major,
 249                         reply.minor, major, minor);
 250         ret = -1;
 251
 252 error:
 253         return ret;
 254 }
 255
 256 #if 0
 257 /*
 258  * Start data command on the relayd.
 259  *
 260  * On success return 0 else return ret_code negative value.
 261  */
 262 int relayd_start_data(struct lttcomm_sock *sock)
 263 {
 264         int ret;
 265         struct lttcomm_relayd_generic_reply reply;
 266
 267         /* Code flow error. Safety net. */
 268         assert(sock);
 269
 270         DBG("Relayd start data command");
 271
 272         /* Send command */
 273         ret = send_command(sock, RELAYD_START_DATA, NULL, 0, 0);
 274         if (ret < 0) {
 275                 goto error;
 276         }
 277
 278         /* Recevie response */
 279         ret = recv_reply(sock, (void *) &reply, sizeof(reply));
 280         if (ret < 0) {
 281                 goto error;
 282         }
 283
 284         /* Return session id or negative ret code. */
 285         if (reply.ret_code != LTTCOMM_OK) {
 286                 ret = -reply.ret_code;
 287         } else {
 288                 /* Success */
 289                 ret = 0;
 290         }
 291
 292 error:
 293         return ret;
 294 }
 295 #endif
 296
 297 /*
 298  * Add stream on the relayd and assign stream handle to the stream_id argument.
 299  *
 300  * On success return 0 else return ret_code negative value.
 301  */
 302 int relayd_send_metadata(struct lttcomm_sock *sock, size_t len)
 303 {
 304         int ret;
 305
 306         /* Code flow error. Safety net. */
 307         assert(sock);
 308
 309         DBG("Relayd sending metadata of size %lu", len);
 310
 311         /* Send command */
 312         ret = send_command(sock, RELAYD_SEND_METADATA, NULL, len, 0);
 313         if (ret < 0) {
 314                 goto error;
 315         }
 316
 317         DBG2("Relayd metadata added successfully");
 318
 319         /*
 320          * After that call, the metadata data MUST be sent to the relayd so the
 321          * receive size on the other end matches the len of the metadata packet
 322          * header.
 323          */
 324
 325 error:
 326         return ret;
 327 }
 328
 329 /*
 330  * Connect to relay daemon with an allocated lttcomm_sock.
 331  */
 332 int relayd_connect(struct lttcomm_sock *sock)
 333 {
 334         /* Code flow error. Safety net. */
 335         assert(sock);
 336
 337         DBG3("Relayd connect ...");
 338
 339         return sock->ops->connect(sock);
 340 }
 341
 342 /*
 343  * Close relayd socket with an allocated lttcomm_sock.
 344  */
 345 int relayd_close(struct lttcomm_sock *sock)
 346 {
 347         /* Code flow error. Safety net. */
 348         assert(sock);
 349
 350         DBG3("Relayd closing socket %d", sock->fd);
 351
 352         return sock->ops->close(sock);
 353 }
 354
 355 /*
 356  * Send data header structure to the relayd.
 357  */
 358 int relayd_send_data_hdr(struct lttcomm_sock *sock,
 359                 struct lttcomm_relayd_data_hdr *hdr, size_t size)
 360 {
 361         int ret;
 362
 363         /* Code flow error. Safety net. */
 364         assert(sock);
 365         assert(hdr);
 366
 367         DBG3("Relayd sending data header...");
 368
 369         /* Again, safety net */
 370         if (size == 0) {
 371                 size = sizeof(struct lttcomm_relayd_data_hdr);
 372         }
 373
 374         /* Only send data header. */
 375         ret = sock->ops->sendmsg(sock, hdr, size, 0);
 376         if (ret < 0) {
 377                 goto error;
 378         }
 379
 380         /*
 381          * The data MUST be sent right after that command for the receive on the
 382          * other end to match the size in the header.
 383          */
 384
 385 error:
 386         return ret;
 387 }