src/common/uri.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 <arpa/inet.h>
  21 #include <netdb.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <sys/socket.h>
  25
  26 #include <common/common.h>
  27 #include <common/defaults.h>
  28 #include <common/utils.h>
  29
  30 #include "uri.h"
  31
  32 #define LOOPBACK_ADDR_IPV4 "127.0.0.1"
  33 #define LOOPBACK_ADDR_IPV6 "::1"
  34
  35 enum uri_proto_code {
  36         P_NET, P_NET6, P_FILE, P_TCP, P_TCP6,
  37 };
  38
  39 struct uri_proto {
  40         const char *name;
  41         const char *leading_string;
  42         enum uri_proto_code code;
  43         enum lttng_proto_type type;
  44         enum lttng_dst_type dtype;
  45 };
  46
  47 /* Supported protocols */
  48 static const struct uri_proto proto_uri[] = {
  49         { .name = "file", .leading_string = "file://", .code = P_FILE, .type = 0, .dtype = LTTNG_DST_PATH },
  50         { .name = "net", .leading_string = "net://", .code = P_NET, .type = LTTNG_TCP, .dtype = LTTNG_DST_IPV4 },
  51         { .name = "net4", .leading_string = "net4://", .code = P_NET, .type = LTTNG_TCP, .dtype = LTTNG_DST_IPV4 },
  52         { .name = "net6", .leading_string = "net6://", .code = P_NET6, .type = LTTNG_TCP, .dtype = LTTNG_DST_IPV6 },
  53         { .name = "tcp", .leading_string = "tcp://", .code = P_TCP, .type = LTTNG_TCP, .dtype = LTTNG_DST_IPV4 },
  54         { .name = "tcp4", .leading_string = "tcp4://", .code = P_TCP, .type = LTTNG_TCP, .dtype = LTTNG_DST_IPV4 },
  55         { .name = "tcp6", .leading_string = "tcp6://", .code = P_TCP6, .type = LTTNG_TCP, .dtype = LTTNG_DST_IPV6 },
  56         /* Invalid proto marking the end of the array. */
  57         { NULL, NULL, 0, 0, 0 }
  58 };
  59
  60 /*
  61  * Return pointer to the character in s matching one of the characters in
  62  * accept. If nothing is found, return pointer to the end of string (eos).
  63  */
  64 static const inline char *strpbrk_or_eos(const char *s, const char *accept)
  65 {
  66         char *p = strpbrk(s, accept);
  67         if (p == NULL) {
  68                 p = strchr(s, '\0');
  69         }
  70
  71         return p;
  72 }
  73
  74
  75 /*
  76  * Validate if proto is a supported protocol from proto_uri array.
  77  */
  78 static const struct uri_proto *get_uri_proto(const char *uri_str)
  79 {
  80         const struct uri_proto *supported = NULL;
  81
  82         /* Safety net */
  83         if (uri_str == NULL) {
  84                 goto end;
  85         }
  86
  87         for (supported = &proto_uri[0];
  88                         supported->leading_string != NULL; ++supported) {
  89                 if (strncasecmp(uri_str, supported->leading_string,
  90                                         strlen(supported->leading_string)) == 0) {
  91                         goto end;
  92                 }
  93         }
  94
  95         /* Proto not found */
  96         return NULL;
  97
  98 end:
  99         return supported;
 100 }
 101
 102 /*
 103  * Set network address from string into dst. Supports both IP string and
 104  * hostname.
 105  */
 106 static int set_ip_address(const char *addr, int af, char *dst, size_t size)
 107 {
 108         int ret;
 109         unsigned char buf[sizeof(struct in6_addr)];
 110         struct hostent *record;
 111
 112         assert(addr);
 113         assert(dst);
 114
 115         memset(dst, 0, size);
 116
 117         /* Network protocol */
 118         ret = inet_pton(af, addr, buf);
 119         if (ret < 1) {
 120                 /* We consider the dst to be an hostname or an invalid IP char */
 121                 record = gethostbyname2(addr, af);
 122                 if (record) {
 123                         /* Translate IP to string */
 124                         if (!inet_ntop(af, record->h_addr_list[0], dst, size)) {
 125                                 PERROR("inet_ntop");
 126                                 goto error;
 127                         }
 128                 } else if (!strcmp(addr, "localhost") &&
 129                                 (af == AF_INET || af == AF_INET6)) {
 130                         /*
 131                          * Some systems may not have "localhost" defined in
 132                          * accordance with IETF RFC 6761. According to this RFC,
 133                          * applications may recognize "localhost" names as
 134                          * special and resolve to the appropriate loopback
 135                          * address.
 136                          *
 137                          * We choose to use the system name resolution API first
 138                          * to honor its network configuration. If this fails, we
 139                          * resolve to the appropriate loopback address. This is
 140                          * done to accomodate systems which may want to start
 141                          * tracing before their network configured.
 142                          */
 143                         const char *loopback_addr = af == AF_INET ?
 144                                         LOOPBACK_ADDR_IPV4 : LOOPBACK_ADDR_IPV6;
 145                         const size_t loopback_addr_len = af == AF_INET ?
 146                                         sizeof(LOOPBACK_ADDR_IPV4) :
 147                                         sizeof(LOOPBACK_ADDR_IPV6);
 148
 149                         DBG2("Could not resolve localhost address, using fallback");
 150                         if (loopback_addr_len > size) {
 151                                 ERR("Could not resolve localhost address; destination string is too short");
 152                                 goto error;
 153                         }
 154                         strcpy(dst, loopback_addr);
 155                 } else {
 156                         /* At this point, the IP or the hostname is bad */
 157                         goto error;
 158                 }
 159         } else {
 160                 if (size > 0) {
 161                         strncpy(dst, addr, size);
 162                         dst[size - 1] = '\0';
 163                 }
 164         }
 165
 166         DBG2("IP address resolved to %s", dst);
 167         return 0;
 168
 169 error:
 170         ERR("URI parse bad hostname %s for af %d", addr, af);
 171         return -1;
 172 }
 173
 174 /*
 175  * Set default URI attribute which is basically the given stream type and the
 176  * default port if none is set in the URI.
 177  */
 178 static void set_default_uri_attr(struct lttng_uri *uri,
 179                 enum lttng_stream_type stype)
 180 {
 181         uri->stype = stype;
 182         if (uri->dtype != LTTNG_DST_PATH && uri->port == 0) {
 183                 uri->port = (stype == LTTNG_STREAM_CONTROL) ?
 184                         DEFAULT_NETWORK_CONTROL_PORT : DEFAULT_NETWORK_DATA_PORT;
 185         }
 186 }
 187
 188 /*
 189  * Compare two URL destination.
 190  *
 191  * Return 0 is equal else is not equal.
 192  */
 193 static int compare_destination(struct lttng_uri *ctrl, struct lttng_uri *data)
 194 {
 195         int ret;
 196
 197         assert(ctrl);
 198         assert(data);
 199
 200         switch (ctrl->dtype) {
 201         case LTTNG_DST_IPV4:
 202                 ret = strncmp(ctrl->dst.ipv4, data->dst.ipv4, sizeof(ctrl->dst.ipv4));
 203                 break;
 204         case LTTNG_DST_IPV6:
 205                 ret = strncmp(ctrl->dst.ipv6, data->dst.ipv6, sizeof(ctrl->dst.ipv6));
 206                 break;
 207         default:
 208                 ret = -1;
 209                 break;
 210         }
 211
 212         return ret;
 213 }
 214
 215 /*
 216  * Build a string URL from a lttng_uri object.
 217  */
 218 LTTNG_HIDDEN
 219 int uri_to_str_url(struct lttng_uri *uri, char *dst, size_t size)
 220 {
 221         int ipver, ret;
 222         const char *addr;
 223         char proto[5], port[7];
 224
 225         assert(uri);
 226         assert(dst);
 227
 228         if (uri->dtype == LTTNG_DST_PATH) {
 229                 ipver = 0;
 230                 addr = uri->dst.path;
 231                 (void) snprintf(proto, sizeof(proto), "file");
 232                 (void) snprintf(port, sizeof(port), "%s", "");
 233         } else {
 234                 ipver = (uri->dtype == LTTNG_DST_IPV4) ? 4 : 6;
 235                 addr = (ipver == 4) ?  uri->dst.ipv4 : uri->dst.ipv6;
 236                 (void) snprintf(proto, sizeof(proto), "tcp%d", ipver);
 237                 (void) snprintf(port, sizeof(port), ":%d", uri->port);
 238         }
 239
 240         ret = snprintf(dst, size, "%s://%s%s%s%s/%s", proto,
 241                         (ipver == 6) ? "[" : "", addr, (ipver == 6) ? "]" : "",
 242                         port, uri->subdir);
 243         if (ret < 0) {
 244                 PERROR("snprintf uri to url");
 245         }
 246
 247         return ret;
 248 }
 249
 250 /*
 251  * Compare two URIs.
 252  *
 253  * Return 0 if equal else 1.
 254  */
 255 LTTNG_HIDDEN
 256 int uri_compare(struct lttng_uri *uri1, struct lttng_uri *uri2)
 257 {
 258         return memcmp(uri1, uri2, sizeof(struct lttng_uri));
 259 }
 260
 261 /*
 262  * Free URI memory.
 263  */
 264 LTTNG_HIDDEN
 265 void uri_free(struct lttng_uri *uri)
 266 {
 267         free(uri);
 268 }
 269
 270 /*
 271  * Return an allocated URI.
 272  */
 273 LTTNG_HIDDEN
 274 struct lttng_uri *uri_create(void)
 275 {
 276         struct lttng_uri *uri;
 277
 278         uri = zmalloc(sizeof(struct lttng_uri));
 279         if (uri == NULL) {
 280                 PERROR("zmalloc uri");
 281         }
 282
 283         return uri;
 284 }
 285
 286 /*
 287  * Parses a string URI to a lttng_uri. This function can potentially return
 288  * more than one URI in uris so the size of the array is returned and uris is
 289  * allocated and populated. Caller must free(3) the array.
 290  *
 291  * This function can not detect the stream type of the URI so the caller has to
 292  * make sure the correct type (stype) is set on the return URI(s). The default
 293  * port must also be set by the caller if the returned URI has its port set to
 294  * zero.
 295  *
 296  * NOTE: A good part of the following code was inspired from the "wget" source
 297  * tree from the src/url.c file and url_parse() function. Also, the
 298  * strpbrk_or_eos() function found above is also inspired by the same code.
 299  * This code was originally licensed GPLv2 so we acknolwedge the Free Software
 300  * Foundation here for the work and to make sure we are compliant with it.
 301  */
 302 LTTNG_HIDDEN
 303 ssize_t uri_parse(const char *str_uri, struct lttng_uri **uris)
 304 {
 305         int ret, i = 0;
 306         /* Size of the uris array. Default is 1 */
 307         ssize_t size = 1;
 308         char subdir[PATH_MAX];
 309         unsigned int ctrl_port = 0;
 310         unsigned int data_port = 0;
 311         struct lttng_uri *tmp_uris;
 312         char *addr_f = NULL;
 313         const struct uri_proto *proto;
 314         const char *purl, *addr_e, *addr_b, *subdir_b = NULL;
 315         const char *seps = ":/\0";
 316
 317         /*
 318          * The first part is the protocol portion of a maximum of 5 bytes for now.
 319          * The second part is the hostname or IP address. The 255 bytes size is the
 320          * limit found in the RFC 1035 for the total length of a domain name
 321          * (https://www.ietf.org/rfc/rfc1035.txt). Finally, for the net://
 322          * protocol, two ports CAN be specified.
 323          */
 324
 325         DBG3("URI string: %s", str_uri);
 326
 327         proto = get_uri_proto(str_uri);
 328         if (proto == NULL) {
 329                 ERR("URI parse unknown protocol %s", str_uri);
 330                 goto error;
 331         }
 332
 333         purl = str_uri;
 334
 335         if (proto->code == P_NET || proto->code == P_NET6) {
 336                 /* Special case for net:// which requires two URI objects */
 337                 size = 2;
 338         }
 339
 340         /* Allocate URI array */
 341         tmp_uris = zmalloc(sizeof(struct lttng_uri) * size);
 342         if (tmp_uris == NULL) {
 343                 PERROR("zmalloc uri");
 344                 goto error;
 345         }
 346
 347         memset(subdir, 0, sizeof(subdir));
 348         purl += strlen(proto->leading_string);
 349
 350         /* Copy known value to the first URI. */
 351         tmp_uris[0].dtype = proto->dtype;
 352         tmp_uris[0].proto = proto->type;
 353
 354         if (proto->code == P_FILE) {
 355                 if (*purl != '/') {
 356                         ERR("Missing destination full path.");
 357                         goto free_error;
 358                 }
 359
 360                 strncpy(tmp_uris[0].dst.path, purl, sizeof(tmp_uris[0].dst.path));
 361                 tmp_uris[0].dst.path[sizeof(tmp_uris[0].dst.path) - 1] = '\0';
 362                 DBG3("URI file destination: %s", purl);
 363                 goto end;
 364         }
 365
 366         /* Assume we are at the beginning of an address or host of some sort. */
 367         addr_b = purl;
 368
 369         /*
 370          * Handle IPv6 address inside square brackets as mention by RFC 2732. IPv6
 371          * address that does not start AND end with brackets will be rejected even
 372          * if valid.
 373          *
 374          * proto://[<addr>]...
 375          *         ^
 376          */
 377         if (*purl == '[') {
 378                 /* Address begins after '[' */
 379                 addr_b = purl + 1;
 380                 addr_e = strchr(addr_b, ']');
 381                 if (addr_e == NULL || addr_b == addr_e) {
 382                         ERR("Broken IPv6 address %s", addr_b);
 383                         goto free_error;
 384                 }
 385
 386                 /* Moving parsed URL pointer after the final bracket ']' */
 387                 purl = addr_e + 1;
 388
 389                 /*
 390                  * The closing bracket must be followed by a seperator or NULL char.
 391                  */
 392                 if (strchr(seps, *purl) == NULL) {
 393                         ERR("Unknown symbol after IPv6 address: %s", purl);
 394                         goto free_error;
 395                 }
 396         } else {
 397                 purl = strpbrk_or_eos(purl, seps);
 398                 addr_e = purl;
 399         }
 400
 401         /* Check if we at least have a char for the addr or hostname. */
 402         if (addr_b == addr_e) {
 403                 ERR("No address or hostname detected.");
 404                 goto free_error;
 405         }
 406
 407         addr_f = utils_strdupdelim(addr_b, addr_e);
 408         if (addr_f == NULL) {
 409                 goto free_error;
 410         }
 411
 412         /*
 413          * Detect PORT after address. The net/net6 protocol allows up to two port
 414          * so we can define the control and data port.
 415          */
 416         while (*purl == ':') {
 417                 const char *port_b, *port_e;
 418                 char *port_f;
 419
 420                 /* Update pass counter */
 421                 i++;
 422
 423                 /*
 424                  * Maximum of two ports is possible if P_NET/NET6. Bigger than that,
 425                  * two much stuff.
 426                  */
 427                 if ((i == 2 && (proto->code != P_NET && proto->code != P_NET6))
 428                                 || i > 2) {
 429                         break;
 430                 }
 431
 432                 /*
 433                  * Move parsed URL to port value.
 434                  * proto://addr_host:PORT1:PORT2/foo/bar
 435                  *                   ^
 436                  */
 437                 ++purl;
 438                 port_b = purl;
 439                 purl = strpbrk_or_eos(purl, seps);
 440                 port_e = purl;
 441
 442                 if (port_b != port_e) {
 443                         int port;
 444
 445                         port_f = utils_strdupdelim(port_b, port_e);
 446                         if (port_f == NULL) {
 447                                 goto free_error;
 448                         }
 449
 450                         port = atoi(port_f);
 451                         if (port > 0xffff || port <= 0x0) {
 452                                 ERR("Invalid port number %d", port);
 453                                 free(port_f);
 454                                 goto free_error;
 455                         }
 456                         free(port_f);
 457
 458                         if (i == 1) {
 459                                 ctrl_port = port;
 460                         } else {
 461                                 data_port = port;
 462                         }
 463                 }
 464         };
 465
 466         /* Check for a valid subdir or trailing garbage */
 467         if (*purl == '/') {
 468                 /*
 469                  * Move to subdir value.
 470                  * proto://addr_host:PORT1:PORT2/foo/bar
 471                  *                               ^
 472                  */
 473                 ++purl;
 474                 subdir_b = purl;
 475         } else if (*purl != '\0') {
 476                 ERR("Trailing characters not recognized: %s", purl);
 477                 goto free_error;
 478         }
 479
 480         /* We have enough valid information to create URI(s) object */
 481
 482         /* Copy generic information */
 483         tmp_uris[0].port = ctrl_port;
 484
 485         /* Copy subdirectory if one. */
 486         if (subdir_b) {
 487                 strncpy(tmp_uris[0].subdir, subdir_b, sizeof(tmp_uris[0].subdir));
 488                 tmp_uris[0].subdir[sizeof(tmp_uris[0].subdir) - 1] = '\0';
 489         }
 490
 491         switch (proto->code) {
 492         case P_NET:
 493                 ret = set_ip_address(addr_f, AF_INET, tmp_uris[0].dst.ipv4,
 494                                 sizeof(tmp_uris[0].dst.ipv4));
 495                 if (ret < 0) {
 496                         goto free_error;
 497                 }
 498
 499                 memcpy(tmp_uris[1].dst.ipv4, tmp_uris[0].dst.ipv4, sizeof(tmp_uris[1].dst.ipv4));
 500
 501                 tmp_uris[1].dtype = proto->dtype;
 502                 tmp_uris[1].proto = proto->type;
 503                 tmp_uris[1].port = data_port;
 504                 break;
 505         case P_NET6:
 506                 ret = set_ip_address(addr_f, AF_INET6, tmp_uris[0].dst.ipv6,
 507                                 sizeof(tmp_uris[0].dst.ipv6));
 508                 if (ret < 0) {
 509                         goto free_error;
 510                 }
 511
 512                 memcpy(tmp_uris[1].dst.ipv6, tmp_uris[0].dst.ipv6, sizeof(tmp_uris[1].dst.ipv6));
 513
 514                 tmp_uris[1].dtype = proto->dtype;
 515                 tmp_uris[1].proto = proto->type;
 516                 tmp_uris[1].port = data_port;
 517                 break;
 518         case P_TCP:
 519                 ret = set_ip_address(addr_f, AF_INET, tmp_uris[0].dst.ipv4,
 520                                 sizeof(tmp_uris[0].dst.ipv4));
 521                 if (ret < 0) {
 522                         goto free_error;
 523                 }
 524                 break;
 525         case P_TCP6:
 526                 ret = set_ip_address(addr_f, AF_INET6, tmp_uris[0].dst.ipv6,
 527                                 sizeof(tmp_uris[0].dst.ipv6));
 528                 if (ret < 0) {
 529                         goto free_error;
 530                 }
 531                 break;
 532         default:
 533                 goto free_error;
 534         }
 535
 536 end:
 537         DBG3("URI dtype: %d, proto: %d, host: %s, subdir: %s, ctrl: %d, data: %d",
 538                         proto->dtype, proto->type, (addr_f == NULL) ? "" : addr_f,
 539                         (subdir_b == NULL) ? "" : subdir_b, ctrl_port, data_port);
 540
 541         free(addr_f);
 542
 543         *uris = tmp_uris;
 544         return size;
 545
 546 free_error:
 547         free(addr_f);
 548         free(tmp_uris);
 549 error:
 550         return -1;
 551 }
 552
 553 /*
 554  * Parse a string URL and creates URI(s) returning the size of the populated
 555  * array.
 556  */
 557 LTTNG_HIDDEN
 558 ssize_t uri_parse_str_urls(const char *ctrl_url, const char *data_url,
 559                 struct lttng_uri **uris)
 560 {
 561         unsigned int equal = 1, idx = 0;
 562         /* Add the "file://" size to the URL maximum size */
 563         char url[PATH_MAX + 7];
 564         ssize_t size_ctrl = 0, size_data = 0, size;
 565         struct lttng_uri *ctrl_uris = NULL, *data_uris = NULL;
 566         struct lttng_uri *tmp_uris = NULL;
 567
 568         /* No URL(s) is allowed. This means that the consumer will be disabled. */
 569         if (ctrl_url == NULL && data_url == NULL) {
 570                 return 0;
 571         }
 572
 573         /* Check if URLs are equal and if so, only use the control URL */
 574         if ((ctrl_url && *ctrl_url != '\0') && (data_url && *data_url != '\0')) {
 575                 equal = !strcmp(ctrl_url, data_url);
 576         }
 577
 578         /*
 579          * Since we allow the str_url to be a full local filesystem path, we are
 580          * going to create a valid file:// URL if it's the case.
 581          *
 582          * Check if first character is a '/' or else reject the URL.
 583          */
 584         if (ctrl_url && ctrl_url[0] == '/') {
 585                 int ret;
 586
 587                 ret = snprintf(url, sizeof(url), "file://%s", ctrl_url);
 588                 if (ret < 0) {
 589                         PERROR("snprintf file url");
 590                         goto parse_error;
 591                 }
 592                 ctrl_url = url;
 593         }
 594
 595         /* Parse the control URL if there is one */
 596         if (ctrl_url && *ctrl_url != '\0') {
 597                 size_ctrl = uri_parse(ctrl_url, &ctrl_uris);
 598                 if (size_ctrl < 1) {
 599                         ERR("Unable to parse the URL %s", ctrl_url);
 600                         goto parse_error;
 601                 }
 602
 603                 /* At this point, we know there is at least one URI in the array */
 604                 set_default_uri_attr(&ctrl_uris[0], LTTNG_STREAM_CONTROL);
 605
 606                 if (ctrl_uris[0].dtype == LTTNG_DST_PATH &&
 607                                 (data_url && *data_url != '\0')) {
 608                         ERR("Can not have a data URL when destination is file://");
 609                         goto error;
 610                 }
 611
 612                 /* URL are not equal but the control URL uses a net:// protocol */
 613                 if (size_ctrl == 2) {
 614                         if (!equal) {
 615                                 ERR("Control URL uses the net:// protocol and the data URL is "
 616                                                 "different. Not allowed.");
 617                                 goto error;
 618                         } else {
 619                                 set_default_uri_attr(&ctrl_uris[1], LTTNG_STREAM_DATA);
 620                                 /*
 621                                  * The data_url and ctrl_url are equal and the ctrl_url
 622                                  * contains a net:// protocol so we just skip the data part.
 623                                  */
 624                                 data_url = NULL;
 625                         }
 626                 }
 627         }
 628
 629         if (data_url && *data_url != '\0') {
 630                 int ret;
 631
 632                 /* We have to parse the data URL in this case */
 633                 size_data = uri_parse(data_url, &data_uris);
 634                 if (size_data < 1) {
 635                         ERR("Unable to parse the URL %s", data_url);
 636                         goto error;
 637                 } else if (size_data == 2) {
 638                         ERR("Data URL can not be set with the net[4|6]:// protocol");
 639                         goto error;
 640                 }
 641
 642                 set_default_uri_attr(&data_uris[0], LTTNG_STREAM_DATA);
 643
 644                 ret = compare_destination(&ctrl_uris[0], &data_uris[0]);
 645                 if (ret != 0) {
 646                         ERR("Control and data destination mismatch");
 647                         goto error;
 648                 }
 649         }
 650
 651         /* Compute total size */
 652         size = size_ctrl + size_data;
 653
 654         tmp_uris = zmalloc(sizeof(struct lttng_uri) * size);
 655         if (tmp_uris == NULL) {
 656                 PERROR("zmalloc uris");
 657                 goto error;
 658         }
 659
 660         if (ctrl_uris) {
 661                 /* It's possible the control URIs array contains more than one URI */
 662                 memcpy(tmp_uris, ctrl_uris, sizeof(struct lttng_uri) * size_ctrl);
 663                 ++idx;
 664                 free(ctrl_uris);
 665         }
 666
 667         if (data_uris) {
 668                 memcpy(&tmp_uris[idx], data_uris, sizeof(struct lttng_uri));
 669                 free(data_uris);
 670         }
 671
 672         *uris = tmp_uris;
 673
 674         return size;
 675
 676 error:
 677         free(ctrl_uris);
 678         free(data_uris);
 679         free(tmp_uris);
 680 parse_error:
 681         return -1;
 682 }