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 _LGPL_SOURCE
  19 #include <assert.h>
  20 #include <arpa/inet.h>
  21 #include <common/compat/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 inline const 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  * Validate if proto is a supported protocol from proto_uri array.
  76  */
  77 static const struct uri_proto *get_uri_proto(const char *uri_str)
  78 {
  79         const struct uri_proto *supported = NULL;
  80
  81         /* Safety net */
  82         if (uri_str == NULL) {
  83                 goto end;
  84         }
  85
  86         for (supported = &proto_uri[0];
  87                         supported->leading_string != NULL; ++supported) {
  88                 if (strncasecmp(uri_str, supported->leading_string,
  89                                         strlen(supported->leading_string)) == 0) {
  90                         goto end;
  91                 }
  92         }
  93
  94         /* Proto not found */
  95         return NULL;
  96
  97 end:
  98         return supported;
  99 }
 100
 101 /*
 102  * Set network address from string into dst. Supports both IP string and
 103  * hostname.
 104  */
 105 static int set_ip_address(const char *addr, int af, char *dst, size_t size)
 106 {
 107         int ret;
 108         unsigned char buf[sizeof(struct in6_addr)];
 109         struct hostent *record;
 110
 111         assert(addr);
 112         assert(dst);
 113
 114         memset(dst, 0, size);
 115
 116         /* Network protocol */
 117         ret = inet_pton(af, addr, buf);
 118         if (ret < 1) {
 119                 /* We consider the dst to be an hostname or an invalid IP char */
 120                 record = lttng_gethostbyname2(addr, af);
 121                 if (record) {
 122                         /* Translate IP to string */
 123                         if (!inet_ntop(af, record->h_addr_list[0], dst, size)) {
 124                                 PERROR("inet_ntop");
 125                                 goto error;
 126                         }
 127                 } else if (!strcmp(addr, "localhost") &&
 128                                 (af == AF_INET || af == AF_INET6)) {
 129                         /*
 130                          * Some systems may not have "localhost" defined in
 131                          * accordance with IETF RFC 6761. According to this RFC,
 132                          * applications may recognize "localhost" names as
 133                          * special and resolve to the appropriate loopback
 134                          * address.
 135                          *
 136                          * We choose to use the system name resolution API first
 137                          * to honor its network configuration. If this fails, we
 138                          * resolve to the appropriate loopback address. This is
 139                          * done to accomodate systems which may want to start
 140                          * tracing before their network configured.
 141                          */
 142                         const char *loopback_addr = af == AF_INET ?
 143                                         LOOPBACK_ADDR_IPV4 : LOOPBACK_ADDR_IPV6;
 144                         const size_t loopback_addr_len = af == AF_INET ?
 145                                         sizeof(LOOPBACK_ADDR_IPV4) :
 146                                         sizeof(LOOPBACK_ADDR_IPV6);
 147
 148                         DBG2("Could not resolve localhost address, using fallback");
 149                         if (loopback_addr_len > size) {
 150                                 ERR("Could not resolve localhost address; destination string is too short");
 151                                 goto error;
 152                         }
 153                         strcpy(dst, loopback_addr);
 154                 } else {
 155                         /* At this point, the IP or the hostname is bad */
 156                         goto error;
 157                 }
 158         } else {
 159                 if (size > 0) {
 160                         strncpy(dst, addr, size);
 161                         dst[size - 1] = '\0';
 162                 }
 163         }
 164
 165         DBG2("IP address resolved to %s", dst);
 166         return 0;
 167
 168 error:
 169         ERR("URI parse bad hostname %s for af %d", addr, af);
 170         return -1;
 171 }
 172
 173 /*
 174  * Set default URI attribute which is basically the given stream type and the
 175  * default port if none is set in the URI.
 176  */
 177 static void set_default_uri_attr(struct lttng_uri *uri,
 178                 enum lttng_stream_type stype)
 179 {
 180         uri->stype = stype;
 181         if (uri->dtype != LTTNG_DST_PATH && uri->port == 0) {
 182                 uri->port = (stype == LTTNG_STREAM_CONTROL) ?
 183                         DEFAULT_NETWORK_CONTROL_PORT : DEFAULT_NETWORK_DATA_PORT;
 184         }
 185 }
 186
 187 /*
 188  * Compare two URL destination.
 189  *
 190  * Return 0 is equal else is not equal.
 191  */
 192 static int compare_destination(struct lttng_uri *ctrl, struct lttng_uri *data)
 193 {
 194         int ret;
 195
 196         assert(ctrl);
 197         assert(data);
 198
 199         switch (ctrl->dtype) {
 200         case LTTNG_DST_IPV4:
 201                 ret = strncmp(ctrl->dst.ipv4, data->dst.ipv4, sizeof(ctrl->dst.ipv4));
 202                 break;
 203         case LTTNG_DST_IPV6:
 204                 ret = strncmp(ctrl->dst.ipv6, data->dst.ipv6, sizeof(ctrl->dst.ipv6));
 205                 break;
 206         default:
 207                 ret = -1;
 208                 break;
 209         }
 210
 211         return ret;
 212 }
 213
 214 /*
 215  * Build a string URL from a lttng_uri object.
 216  */
 217 LTTNG_HIDDEN
 218 int uri_to_str_url(struct lttng_uri *uri, char *dst, size_t size)
 219 {
 220         int ipver, ret;
 221         const char *addr;
 222         char proto[5], port[7];
 223
 224         assert(uri);
 225         assert(dst);
 226
 227         if (uri->dtype == LTTNG_DST_PATH) {
 228                 ipver = 0;
 229                 addr = uri->dst.path;
 230                 (void) snprintf(proto, sizeof(proto), "file");
 231                 (void) snprintf(port, sizeof(port), "%s", "");
 232         } else {
 233                 ipver = (uri->dtype == LTTNG_DST_IPV4) ? 4 : 6;
 234                 addr = (ipver == 4) ?  uri->dst.ipv4 : uri->dst.ipv6;
 235                 (void) snprintf(proto, sizeof(proto), "tcp%d", ipver);
 236                 (void) snprintf(port, sizeof(port), ":%d", uri->port);
 237         }
 238
 239         ret = snprintf(dst, size, "%s://%s%s%s%s/%s", proto,
 240                         (ipver == 6) ? "[" : "", addr, (ipver == 6) ? "]" : "",
 241                         port, uri->subdir);
 242         if (ret < 0) {
 243                 PERROR("snprintf uri to url");
 244         }
 245
 246         return ret;
 247 }
 248
 249 /*
 250  * Compare two URIs.
 251  *
 252  * Return 0 if equal else 1.
 253  */
 254 LTTNG_HIDDEN
 255 int uri_compare(struct lttng_uri *uri1, struct lttng_uri *uri2)
 256 {
 257         return memcmp(uri1, uri2, sizeof(struct lttng_uri));
 258 }
 259
 260 /*
 261  * Free URI memory.
 262  */
 263 LTTNG_HIDDEN
 264 void uri_free(struct lttng_uri *uri)
 265 {
 266         free(uri);
 267 }
 268
 269 /*
 270  * Parses a string URI to a lttng_uri. This function can potentially return
 271  * more than one URI in uris so the size of the array is returned and uris is
 272  * allocated and populated. Caller must free(3) the array.
 273  *
 274  * This function can not detect the stream type of the URI so the caller has to
 275  * make sure the correct type (stype) is set on the return URI(s). The default
 276  * port must also be set by the caller if the returned URI has its port set to
 277  * zero.
 278  *
 279  * NOTE: A good part of the following code was inspired from the "wget" source
 280  * tree from the src/url.c file and url_parse() function. Also, the
 281  * strpbrk_or_eos() function found above is also inspired by the same code.
 282  * This code was originally licensed GPLv2 so we acknolwedge the Free Software
 283  * Foundation here for the work and to make sure we are compliant with it.
 284  */
 285 LTTNG_HIDDEN
 286 ssize_t uri_parse(const char *str_uri, struct lttng_uri **uris)
 287 {
 288         int ret, i = 0;
 289         /* Size of the uris array. Default is 1 */
 290         ssize_t size = 1;
 291         char subdir[PATH_MAX];
 292         unsigned int ctrl_port = 0;
 293         unsigned int data_port = 0;
 294         struct lttng_uri *tmp_uris;
 295         char *addr_f = NULL;
 296         const struct uri_proto *proto;
 297         const char *purl, *addr_e, *addr_b, *subdir_b = NULL;
 298         const char *seps = ":/\0";
 299
 300         /*
 301          * The first part is the protocol portion of a maximum of 5 bytes for now.
 302          * The second part is the hostname or IP address. The 255 bytes size is the
 303          * limit found in the RFC 1035 for the total length of a domain name
 304          * (https://www.ietf.org/rfc/rfc1035.txt). Finally, for the net://
 305          * protocol, two ports CAN be specified.
 306          */
 307
 308         DBG3("URI string: %s", str_uri);
 309
 310         proto = get_uri_proto(str_uri);
 311         if (proto == NULL) {
 312                 ERR("URI parse unknown protocol %s", str_uri);
 313                 goto error;
 314         }
 315
 316         purl = str_uri;
 317
 318         if (proto->code == P_NET || proto->code == P_NET6) {
 319                 /* Special case for net:// which requires two URI objects */
 320                 size = 2;
 321         }
 322
 323         /* Allocate URI array */
 324         tmp_uris = zmalloc(sizeof(struct lttng_uri) * size);
 325         if (tmp_uris == NULL) {
 326                 PERROR("zmalloc uri");
 327                 goto error;
 328         }
 329
 330         memset(subdir, 0, sizeof(subdir));
 331         purl += strlen(proto->leading_string);
 332
 333         /* Copy known value to the first URI. */
 334         tmp_uris[0].dtype = proto->dtype;
 335         tmp_uris[0].proto = proto->type;
 336
 337         if (proto->code == P_FILE) {
 338                 if (*purl != '/') {
 339                         ERR("Missing destination full path.");
 340                         goto free_error;
 341                 }
 342
 343                 strncpy(tmp_uris[0].dst.path, purl, sizeof(tmp_uris[0].dst.path));
 344                 tmp_uris[0].dst.path[sizeof(tmp_uris[0].dst.path) - 1] = '\0';
 345                 DBG3("URI file destination: %s", purl);
 346                 goto end;
 347         }
 348
 349         /* Assume we are at the beginning of an address or host of some sort. */
 350         addr_b = purl;
 351
 352         /*
 353          * Handle IPv6 address inside square brackets as mention by RFC 2732. IPv6
 354          * address that does not start AND end with brackets will be rejected even
 355          * if valid.
 356          *
 357          * proto://[<addr>]...
 358          *         ^
 359          */
 360         if (*purl == '[') {
 361                 /* Address begins after '[' */
 362                 addr_b = purl + 1;
 363                 addr_e = strchr(addr_b, ']');
 364                 if (addr_e == NULL || addr_b == addr_e) {
 365                         ERR("Broken IPv6 address %s", addr_b);
 366                         goto free_error;
 367                 }
 368
 369                 /* Moving parsed URL pointer after the final bracket ']' */
 370                 purl = addr_e + 1;
 371
 372                 /*
 373                  * The closing bracket must be followed by a seperator or NULL char.
 374                  */
 375                 if (strchr(seps, *purl) == NULL) {
 376                         ERR("Unknown symbol after IPv6 address: %s", purl);
 377                         goto free_error;
 378                 }
 379         } else {
 380                 purl = strpbrk_or_eos(purl, seps);
 381                 addr_e = purl;
 382         }
 383
 384         /* Check if we at least have a char for the addr or hostname. */
 385         if (addr_b == addr_e) {
 386                 ERR("No address or hostname detected.");
 387                 goto free_error;
 388         }
 389
 390         addr_f = utils_strdupdelim(addr_b, addr_e);
 391         if (addr_f == NULL) {
 392                 goto free_error;
 393         }
 394
 395         /*
 396          * Detect PORT after address. The net/net6 protocol allows up to two port
 397          * so we can define the control and data port.
 398          */
 399         while (*purl == ':') {
 400                 const char *port_b, *port_e;
 401                 char *port_f;
 402
 403                 /* Update pass counter */
 404                 i++;
 405
 406                 /*
 407                  * Maximum of two ports is possible if P_NET/NET6. Bigger than that,
 408                  * two much stuff.
 409                  */
 410                 if ((i == 2 && (proto->code != P_NET && proto->code != P_NET6))
 411                                 || i > 2) {
 412                         break;
 413                 }
 414
 415                 /*
 416                  * Move parsed URL to port value.
 417                  * proto://addr_host:PORT1:PORT2/foo/bar
 418                  *                   ^
 419                  */
 420                 ++purl;
 421                 port_b = purl;
 422                 purl = strpbrk_or_eos(purl, seps);
 423                 port_e = purl;
 424
 425                 if (port_b != port_e) {
 426                         int port;
 427
 428                         port_f = utils_strdupdelim(port_b, port_e);
 429                         if (port_f == NULL) {
 430                                 goto free_error;
 431                         }
 432
 433                         port = atoi(port_f);
 434                         if (port > 0xffff || port <= 0x0) {
 435                                 ERR("Invalid port number %d", port);
 436                                 free(port_f);
 437                                 goto free_error;
 438                         }
 439                         free(port_f);
 440
 441                         if (i == 1) {
 442                                 ctrl_port = port;
 443                         } else {
 444                                 data_port = port;
 445                         }
 446                 }
 447         };
 448
 449         /* Check for a valid subdir or trailing garbage */
 450         if (*purl == '/') {
 451                 /*
 452                  * Move to subdir value.
 453                  * proto://addr_host:PORT1:PORT2/foo/bar
 454                  *                               ^
 455                  */
 456                 ++purl;
 457                 subdir_b = purl;
 458         } else if (*purl != '\0') {
 459                 ERR("Trailing characters not recognized: %s", purl);
 460                 goto free_error;
 461         }
 462
 463         /* We have enough valid information to create URI(s) object */
 464
 465         /* Copy generic information */
 466         tmp_uris[0].port = ctrl_port;
 467
 468         /* Copy subdirectory if one. */
 469         if (subdir_b) {
 470                 strncpy(tmp_uris[0].subdir, subdir_b, sizeof(tmp_uris[0].subdir));
 471                 tmp_uris[0].subdir[sizeof(tmp_uris[0].subdir) - 1] = '\0';
 472         }
 473
 474         switch (proto->code) {
 475         case P_NET:
 476                 ret = set_ip_address(addr_f, AF_INET, tmp_uris[0].dst.ipv4,
 477                                 sizeof(tmp_uris[0].dst.ipv4));
 478                 if (ret < 0) {
 479                         goto free_error;
 480                 }
 481
 482                 memcpy(tmp_uris[1].dst.ipv4, tmp_uris[0].dst.ipv4, sizeof(tmp_uris[1].dst.ipv4));
 483
 484                 tmp_uris[1].dtype = proto->dtype;
 485                 tmp_uris[1].proto = proto->type;
 486                 tmp_uris[1].port = data_port;
 487                 break;
 488         case P_NET6:
 489                 ret = set_ip_address(addr_f, AF_INET6, tmp_uris[0].dst.ipv6,
 490                                 sizeof(tmp_uris[0].dst.ipv6));
 491                 if (ret < 0) {
 492                         goto free_error;
 493                 }
 494
 495                 memcpy(tmp_uris[1].dst.ipv6, tmp_uris[0].dst.ipv6, sizeof(tmp_uris[1].dst.ipv6));
 496
 497                 tmp_uris[1].dtype = proto->dtype;
 498                 tmp_uris[1].proto = proto->type;
 499                 tmp_uris[1].port = data_port;
 500                 break;
 501         case P_TCP:
 502                 ret = set_ip_address(addr_f, AF_INET, tmp_uris[0].dst.ipv4,
 503                                 sizeof(tmp_uris[0].dst.ipv4));
 504                 if (ret < 0) {
 505                         goto free_error;
 506                 }
 507                 break;
 508         case P_TCP6:
 509                 ret = set_ip_address(addr_f, AF_INET6, tmp_uris[0].dst.ipv6,
 510                                 sizeof(tmp_uris[0].dst.ipv6));
 511                 if (ret < 0) {
 512                         goto free_error;
 513                 }
 514                 break;
 515         default:
 516                 goto free_error;
 517         }
 518
 519 end:
 520         DBG3("URI dtype: %d, proto: %d, host: %s, subdir: %s, ctrl: %d, data: %d",
 521                         proto->dtype, proto->type, (addr_f == NULL) ? "" : addr_f,
 522                         (subdir_b == NULL) ? "" : subdir_b, ctrl_port, data_port);
 523
 524         free(addr_f);
 525
 526         *uris = tmp_uris;
 527         return size;
 528
 529 free_error:
 530         free(addr_f);
 531         free(tmp_uris);
 532 error:
 533         return -1;
 534 }
 535
 536 /*
 537  * Parse a string URL and creates URI(s) returning the size of the populated
 538  * array.
 539  */
 540 LTTNG_HIDDEN
 541 ssize_t uri_parse_str_urls(const char *ctrl_url, const char *data_url,
 542                 struct lttng_uri **uris)
 543 {
 544         unsigned int equal = 1, idx = 0;
 545         /* Add the "file://" size to the URL maximum size */
 546         char url[PATH_MAX + 7];
 547         ssize_t size_ctrl = 0, size_data = 0, size;
 548         struct lttng_uri *ctrl_uris = NULL, *data_uris = NULL;
 549         struct lttng_uri *tmp_uris = NULL;
 550
 551         /* No URL(s) is allowed. This means that the consumer will be disabled. */
 552         if (ctrl_url == NULL && data_url == NULL) {
 553                 return 0;
 554         }
 555
 556         /* Check if URLs are equal and if so, only use the control URL */
 557         if ((ctrl_url && *ctrl_url != '\0') && (data_url && *data_url != '\0')) {
 558                 equal = !strcmp(ctrl_url, data_url);
 559         }
 560
 561         /*
 562          * Since we allow the str_url to be a full local filesystem path, we are
 563          * going to create a valid file:// URL if it's the case.
 564          *
 565          * Check if first character is a '/' or else reject the URL.
 566          */
 567         if (ctrl_url && ctrl_url[0] == '/') {
 568                 int ret;
 569
 570                 ret = snprintf(url, sizeof(url), "file://%s", ctrl_url);
 571                 if (ret < 0) {
 572                         PERROR("snprintf file url");
 573                         goto parse_error;
 574                 } else if (ret >= sizeof(url)) {
 575                         PERROR("snprintf file url is too long");
 576                         goto parse_error;
 577
 578                 }
 579                 ctrl_url = url;
 580         }
 581
 582         /* Parse the control URL if there is one */
 583         if (ctrl_url && *ctrl_url != '\0') {
 584                 size_ctrl = uri_parse(ctrl_url, &ctrl_uris);
 585                 if (size_ctrl < 1) {
 586                         ERR("Unable to parse the URL %s", ctrl_url);
 587                         goto parse_error;
 588                 }
 589
 590                 /* At this point, we know there is at least one URI in the array */
 591                 set_default_uri_attr(&ctrl_uris[0], LTTNG_STREAM_CONTROL);
 592
 593                 if (ctrl_uris[0].dtype == LTTNG_DST_PATH &&
 594                                 (data_url && *data_url != '\0')) {
 595                         ERR("Cannot have a data URL when destination is file://");
 596                         goto error;
 597                 }
 598
 599                 /* URL are not equal but the control URL uses a net:// protocol */
 600                 if (size_ctrl == 2) {
 601                         if (!equal) {
 602                                 ERR("Control URL uses the net:// protocol and the data URL is "
 603                                                 "different. Not allowed.");
 604                                 goto error;
 605                         } else {
 606                                 set_default_uri_attr(&ctrl_uris[1], LTTNG_STREAM_DATA);
 607                                 /*
 608                                  * The data_url and ctrl_url are equal and the ctrl_url
 609                                  * contains a net:// protocol so we just skip the data part.
 610                                  */
 611                                 data_url = NULL;
 612                         }
 613                 }
 614         }
 615
 616         if (data_url && *data_url != '\0') {
 617                 int ret;
 618
 619                 /* We have to parse the data URL in this case */
 620                 size_data = uri_parse(data_url, &data_uris);
 621                 if (size_data < 1) {
 622                         ERR("Unable to parse the URL %s", data_url);
 623                         goto error;
 624                 } else if (size_data == 2) {
 625                         ERR("Data URL can not be set with the net[4|6]:// protocol");
 626                         goto error;
 627                 }
 628
 629                 set_default_uri_attr(&data_uris[0], LTTNG_STREAM_DATA);
 630
 631                 if (ctrl_uris) {
 632                         ret = compare_destination(&ctrl_uris[0], &data_uris[0]);
 633                         if (ret != 0) {
 634                                 ERR("Control and data destination mismatch");
 635                                 goto error;
 636                         }
 637                 }
 638         }
 639
 640         /* Compute total size */
 641         size = size_ctrl + size_data;
 642
 643         tmp_uris = zmalloc(sizeof(struct lttng_uri) * size);
 644         if (tmp_uris == NULL) {
 645                 PERROR("zmalloc uris");
 646                 goto error;
 647         }
 648
 649         if (ctrl_uris) {
 650                 /* It's possible the control URIs array contains more than one URI */
 651                 memcpy(tmp_uris, ctrl_uris, sizeof(struct lttng_uri) * size_ctrl);
 652                 ++idx;
 653                 free(ctrl_uris);
 654         }
 655
 656         if (data_uris) {
 657                 memcpy(&tmp_uris[idx], data_uris, sizeof(struct lttng_uri));
 658                 free(data_uris);
 659         }
 660
 661         *uris = tmp_uris;
 662
 663         return size;
 664
 665 error:
 666         free(ctrl_uris);
 667         free(data_uris);
 668         free(tmp_uris);
 669 parse_error:
 670         return -1;
 671 }