lib/common/remote.c

/* */
This source file includes following definitions.
localized_remote_header
pcmk__tls_client_handshake
set_minimum_dh_bits
get_bound_dh_bits
pcmk__new_tls_session
pcmk__init_tls_dh
pcmk__read_handshake_data
send_tls
send_plaintext
remote_send_iovs
pcmk__remote_send_xml
pcmk__remote_message_xml
get_remote_socket
pcmk__remote_ready
read_available_remote_data
pcmk__read_remote_message
check_connect_finished
connect_socket_retry
connect_socket_once
pcmk__connect_remote
pcmk__sockaddr2str
pcmk__accept_remote_connection
crm_default_remote_port
   1 /*
   2  * Copyright 2008-2021 the Pacemaker project contributors
   3  *
   4  * The version control history for this file may have further details.
   5  *
   6  * This source code is licensed under the GNU Lesser General Public License
   7  * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
   8  */
   9 
  10 #include <crm_internal.h>
  11 #include <crm/crm.h>
  12 
  13 #include <sys/param.h>
  14 #include <stdio.h>
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <unistd.h>
  18 #include <sys/socket.h>
  19 #include <arpa/inet.h>
  20 #include <netinet/in.h>
  21 #include <netinet/ip.h>
  22 #include <netinet/tcp.h>
  23 #include <netdb.h>
  24 #include <stdlib.h>
  25 #include <errno.h>
  26 #include <inttypes.h>  /* X32T ~ PRIx32 */
  27 
  28 #include <glib.h>
  29 #include <bzlib.h>
  30 
  31 #include <crm/common/ipc_internal.h>
  32 #include <crm/common/xml.h>
  33 #include <crm/common/mainloop.h>
  34 #include <crm/common/remote_internal.h>
  35 
  36 #ifdef HAVE_GNUTLS_GNUTLS_H
  37 #  include <gnutls/gnutls.h>
  38 #endif
  39 
  40 /* Swab macros from linux/swab.h */
  41 #ifdef HAVE_LINUX_SWAB_H
  42 #  include <linux/swab.h>
  43 #else
  44 /*
  45  * casts are necessary for constants, because we never know how for sure
  46  * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way.
  47  */
  48 #define __swab16(x) ((uint16_t)(                                      \
  49         (((uint16_t)(x) & (uint16_t)0x00ffU) << 8) |                  \
  50         (((uint16_t)(x) & (uint16_t)0xff00U) >> 8)))
  51 
  52 #define __swab32(x) ((uint32_t)(                                      \
  53         (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) |            \
  54         (((uint32_t)(x) & (uint32_t)0x0000ff00UL) <<  8) |            \
  55         (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >>  8) |            \
  56         (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24)))
  57 
  58 #define __swab64(x) ((uint64_t)(                                      \
  59         (((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) |   \
  60         (((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) |   \
  61         (((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) |   \
  62         (((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) <<  8) |   \
  63         (((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >>  8) |   \
  64         (((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) |   \
  65         (((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) |   \
  66         (((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56)))
  67 #endif
  68 
  69 #define REMOTE_MSG_VERSION 1
  70 #define ENDIAN_LOCAL 0xBADADBBD
  71 
  72 struct remote_header_v0 {
  73     uint32_t endian;    /* Detect messages from hosts with different endian-ness */
  74     uint32_t version;
  75     uint64_t id;
  76     uint64_t flags;
  77     uint32_t size_total;
  78     uint32_t payload_offset;
  79     uint32_t payload_compressed;
  80     uint32_t payload_uncompressed;
  81 
  82         /* New fields get added here */
  83 
  84 } __attribute__ ((packed));
  85 
  86 /*!
  87  * \internal
  88  * \brief Retrieve remote message header, in local endianness
  89  *
  90  * Return a pointer to the header portion of a remote connection's message
  91  * buffer, converting the header to local endianness if needed.
  92  *
  93  * \param[in,out] remote  Remote connection with new message
  94  *
  95  * \return Pointer to message header, localized if necessary
  96  */
  97 static struct remote_header_v0 *
  98 localized_remote_header(pcmk__remote_t *remote)
     /*  */
  99 {
 100     struct remote_header_v0 *header = (struct remote_header_v0 *)remote->buffer;
 101     if(remote->buffer_offset < sizeof(struct remote_header_v0)) {
 102         return NULL;
 103 
 104     } else if(header->endian != ENDIAN_LOCAL) {
 105         uint32_t endian = __swab32(header->endian);
 106 
 107         CRM_LOG_ASSERT(endian == ENDIAN_LOCAL);
 108         if(endian != ENDIAN_LOCAL) {
 109             crm_err("Invalid message detected, endian mismatch: %" X32T
 110                     " is neither %" X32T " nor the swab'd %" X32T,
 111                     ENDIAN_LOCAL, header->endian, endian);
 112             return NULL;
 113         }
 114 
 115         header->id = __swab64(header->id);
 116         header->flags = __swab64(header->flags);
 117         header->endian = __swab32(header->endian);
 118 
 119         header->version = __swab32(header->version);
 120         header->size_total = __swab32(header->size_total);
 121         header->payload_offset = __swab32(header->payload_offset);
 122         header->payload_compressed = __swab32(header->payload_compressed);
 123         header->payload_uncompressed = __swab32(header->payload_uncompressed);
 124     }
 125 
 126     return header;
 127 }
 128 
 129 #ifdef HAVE_GNUTLS_GNUTLS_H
 130 
 131 int
 132 pcmk__tls_client_handshake(pcmk__remote_t *remote, int timeout_ms)
     /*  */
 133 {
 134     int rc = 0;
 135     int pollrc = 0;
 136     time_t time_limit = time(NULL) + timeout_ms / 1000;
 137 
 138     do {
 139         rc = gnutls_handshake(*remote->tls_session);
 140         if ((rc == GNUTLS_E_INTERRUPTED) || (rc == GNUTLS_E_AGAIN)) {
 141             pollrc = pcmk__remote_ready(remote, 1000);
 142             if ((pollrc != pcmk_rc_ok) && (pollrc != ETIME)) {
 143                 /* poll returned error, there is no hope */
 144                 crm_trace("TLS handshake poll failed: %s (%d)",
 145                           pcmk_strerror(pollrc), pollrc);
 146                 return pcmk_legacy2rc(pollrc);
 147             }
 148         } else if (rc < 0) {
 149             crm_trace("TLS handshake failed: %s (%d)",
 150                       gnutls_strerror(rc), rc);
 151             return EPROTO;
 152         } else {
 153             return pcmk_rc_ok;
 154         }
 155     } while (time(NULL) < time_limit);
 156     return ETIME;
 157 }
 158 
 159 /*!
 160  * \internal
 161  * \brief Set minimum prime size required by TLS client
 162  *
 163  * \param[in] session  TLS session to affect
 164  */
 165 static void
 166 set_minimum_dh_bits(gnutls_session_t *session)
     /*  */
 167 {
 168     int dh_min_bits;
 169 
 170     pcmk__scan_min_int(getenv("PCMK_dh_min_bits"), &dh_min_bits, 0);
 171 
 172     /* This function is deprecated since GnuTLS 3.1.7, in favor of letting
 173      * the priority string imply the DH requirements, but this is the only
 174      * way to give the user control over compatibility with older servers.
 175      */
 176     if (dh_min_bits > 0) {
 177         crm_info("Requiring server use a Diffie-Hellman prime of at least %d bits",
 178                  dh_min_bits);
 179         gnutls_dh_set_prime_bits(*session, dh_min_bits);
 180     }
 181 }
 182 
 183 static unsigned int
 184 get_bound_dh_bits(unsigned int dh_bits)
     /*  */
 185 {
 186     int dh_min_bits;
 187     int dh_max_bits;
 188 
 189     pcmk__scan_min_int(getenv("PCMK_dh_min_bits"), &dh_min_bits, 0);
 190     pcmk__scan_min_int(getenv("PCMK_dh_max_bits"), &dh_max_bits, 0);
 191     if ((dh_max_bits > 0) && (dh_max_bits < dh_min_bits)) {
 192         crm_warn("Ignoring PCMK_dh_max_bits less than PCMK_dh_min_bits");
 193         dh_max_bits = 0;
 194     }
 195     if ((dh_min_bits > 0) && (dh_bits < dh_min_bits)) {
 196         return dh_min_bits;
 197     }
 198     if ((dh_max_bits > 0) && (dh_bits > dh_max_bits)) {
 199         return dh_max_bits;
 200     }
 201     return dh_bits;
 202 }
 203 
 204 /*!
 205  * \internal
 206  * \brief Initialize a new TLS session
 207  *
 208  * \param[in] csock       Connected socket for TLS session
 209  * \param[in] conn_type   GNUTLS_SERVER or GNUTLS_CLIENT
 210  * \param[in] cred_type   GNUTLS_CRD_ANON or GNUTLS_CRD_PSK
 211  * \param[in] credentials TLS session credentials
 212  *
 213  * \return Pointer to newly created session object, or NULL on error
 214  */
 215 gnutls_session_t *
 216 pcmk__new_tls_session(int csock, unsigned int conn_type,
     /*  */
 217                       gnutls_credentials_type_t cred_type, void *credentials)
 218 {
 219     int rc = GNUTLS_E_SUCCESS;
 220     const char *prio_base = NULL;
 221     char *prio = NULL;
 222     gnutls_session_t *session = NULL;
 223 
 224     /* Determine list of acceptable ciphers, etc. Pacemaker always adds the
 225      * values required for its functionality.
 226      *
 227      * For an example of anonymous authentication, see:
 228      * http://www.manpagez.com/info/gnutls/gnutls-2.10.4/gnutls_81.php#Echo-Server-with-anonymous-authentication
 229      */
 230 
 231     prio_base = getenv("PCMK_tls_priorities");
 232     if (prio_base == NULL) {
 233         prio_base = PCMK_GNUTLS_PRIORITIES;
 234     }
 235     prio = crm_strdup_printf("%s:%s", prio_base,
 236                              (cred_type == GNUTLS_CRD_ANON)? "+ANON-DH" : "+DHE-PSK:+PSK");
 237 
 238     session = gnutls_malloc(sizeof(gnutls_session_t));
 239     if (session == NULL) {
 240         rc = GNUTLS_E_MEMORY_ERROR;
 241         goto error;
 242     }
 243 
 244     rc = gnutls_init(session, conn_type);
 245     if (rc != GNUTLS_E_SUCCESS) {
 246         goto error;
 247     }
 248 
 249     /* @TODO On the server side, it would be more efficient to cache the
 250      * priority with gnutls_priority_init2() and set it with
 251      * gnutls_priority_set() for all sessions.
 252      */
 253     rc = gnutls_priority_set_direct(*session, prio, NULL);
 254     if (rc != GNUTLS_E_SUCCESS) {
 255         goto error;
 256     }
 257     if (conn_type == GNUTLS_CLIENT) {
 258         set_minimum_dh_bits(session);
 259     }
 260 
 261     gnutls_transport_set_ptr(*session,
 262                              (gnutls_transport_ptr_t) GINT_TO_POINTER(csock));
 263 
 264     rc = gnutls_credentials_set(*session, cred_type, credentials);
 265     if (rc != GNUTLS_E_SUCCESS) {
 266         goto error;
 267     }
 268     free(prio);
 269     return session;
 270 
 271 error:
 272     crm_err("Could not initialize %s TLS %s session: %s "
 273             CRM_XS " rc=%d priority='%s'",
 274             (cred_type == GNUTLS_CRD_ANON)? "anonymous" : "PSK",
 275             (conn_type == GNUTLS_SERVER)? "server" : "client",
 276             gnutls_strerror(rc), rc, prio);
 277     free(prio);
 278     if (session != NULL) {
 279         gnutls_free(session);
 280     }
 281     return NULL;
 282 }
 283 
 284 /*!
 285  * \internal
 286  * \brief Initialize Diffie-Hellman parameters for a TLS server
 287  *
 288  * \param[out] dh_params  Parameter object to initialize
 289  *
 290  * \return Standard Pacemaker return code
 291  * \todo The current best practice is to allow the client and server to
 292  *       negotiate the Diffie-Hellman parameters via a TLS extension (RFC 7919).
 293  *       However, we have to support both older versions of GnuTLS (<3.6) that
 294  *       don't support the extension on our side, and older Pacemaker versions
 295  *       that don't support the extension on the other side. The next best
 296  *       practice would be to use a known good prime (see RFC 5114 section 2.2),
 297  *       possibly stored in a file distributed with Pacemaker.
 298  */
 299 int
 300 pcmk__init_tls_dh(gnutls_dh_params_t *dh_params)
     /*  */
 301 {
 302     int rc = GNUTLS_E_SUCCESS;
 303     unsigned int dh_bits = 0;
 304 
 305     rc = gnutls_dh_params_init(dh_params);
 306     if (rc != GNUTLS_E_SUCCESS) {
 307         goto error;
 308     }
 309 
 310     dh_bits = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH,
 311                                           GNUTLS_SEC_PARAM_NORMAL);
 312     if (dh_bits == 0) {
 313         rc = GNUTLS_E_DH_PRIME_UNACCEPTABLE;
 314         goto error;
 315     }
 316     dh_bits = get_bound_dh_bits(dh_bits);
 317 
 318     crm_info("Generating Diffie-Hellman parameters with %u-bit prime for TLS",
 319              dh_bits);
 320     rc = gnutls_dh_params_generate2(*dh_params, dh_bits);
 321     if (rc != GNUTLS_E_SUCCESS) {
 322         goto error;
 323     }
 324 
 325     return pcmk_rc_ok;
 326 
 327 error:
 328     crm_err("Could not initialize Diffie-Hellman parameters for TLS: %s "
 329             CRM_XS " rc=%d", gnutls_strerror(rc), rc);
 330     return EPROTO;
 331 }
 332 
 333 /*!
 334  * \internal
 335  * \brief Process handshake data from TLS client
 336  *
 337  * Read as much TLS handshake data as is available.
 338  *
 339  * \param[in] client  Client connection
 340  *
 341  * \return Standard Pacemaker return code (of particular interest, EAGAIN
 342  *         if some data was successfully read but more data is needed)
 343  */
 344 int
 345 pcmk__read_handshake_data(pcmk__client_t *client)
     /*  */
 346 {
 347     int rc = 0;
 348 
 349     CRM_ASSERT(client && client->remote && client->remote->tls_session);
 350 
 351     do {
 352         rc = gnutls_handshake(*client->remote->tls_session);
 353     } while (rc == GNUTLS_E_INTERRUPTED);
 354 
 355     if (rc == GNUTLS_E_AGAIN) {
 356         /* No more data is available at the moment. This function should be
 357          * invoked again once the client sends more.
 358          */
 359         return EAGAIN;
 360     } else if (rc != GNUTLS_E_SUCCESS) {
 361         crm_err("TLS handshake with remote client failed: %s "
 362                 CRM_XS " rc=%d", gnutls_strerror(rc), rc);
 363         return EPROTO;
 364     }
 365     return pcmk_rc_ok;
 366 }
 367 
 368 // \return Standard Pacemaker return code
 369 static int
 370 send_tls(gnutls_session_t *session, struct iovec *iov)
     /*  */
 371 {
 372     const char *unsent = iov->iov_base;
 373     size_t unsent_len = iov->iov_len;
 374     ssize_t gnutls_rc;
 375 
 376     if (unsent == NULL) {
 377         return EINVAL;
 378     }
 379 
 380     crm_trace("Sending TLS message of %llu bytes",
 381               (unsigned long long) unsent_len);
 382     while (true) {
 383         gnutls_rc = gnutls_record_send(*session, unsent, unsent_len);
 384 
 385         if (gnutls_rc == GNUTLS_E_INTERRUPTED || gnutls_rc == GNUTLS_E_AGAIN) {
 386             crm_trace("Retrying to send %llu bytes remaining",
 387                       (unsigned long long) unsent_len);
 388 
 389         } else if (gnutls_rc < 0) {
 390             // Caller can log as error if necessary
 391             crm_info("TLS connection terminated: %s " CRM_XS " rc=%lld",
 392                      gnutls_strerror((int) gnutls_rc),
 393                      (long long) gnutls_rc);
 394             return ECONNABORTED;
 395 
 396         } else if (gnutls_rc < unsent_len) {
 397             crm_trace("Sent %lld of %llu bytes remaining",
 398                       (long long) gnutls_rc, (unsigned long long) unsent_len);
 399             unsent_len -= gnutls_rc;
 400             unsent += gnutls_rc;
 401         } else {
 402             crm_trace("Sent all %lld bytes remaining", (long long) gnutls_rc);
 403             break;
 404         }
 405     }
 406     return pcmk_rc_ok;
 407 }
 408 #endif
 409 
 410 // \return Standard Pacemaker return code
 411 static int
 412 send_plaintext(int sock, struct iovec *iov)
     /*  */
 413 {
 414     const char *unsent = iov->iov_base;
 415     size_t unsent_len = iov->iov_len;
 416     ssize_t write_rc;
 417 
 418     if (unsent == NULL) {
 419         return EINVAL;
 420     }
 421 
 422     crm_debug("Sending plaintext message of %llu bytes to socket %d",
 423               (unsigned long long) unsent_len, sock);
 424     while (true) {
 425         write_rc = write(sock, unsent, unsent_len);
 426         if (write_rc < 0) {
 427             int rc = errno;
 428 
 429             if ((errno == EINTR) || (errno == EAGAIN)) {
 430                 crm_trace("Retrying to send %llu bytes remaining to socket %d",
 431                           (unsigned long long) unsent_len, sock);
 432                 continue;
 433             }
 434 
 435             // Caller can log as error if necessary
 436             crm_info("Could not send message: %s " CRM_XS " rc=%d socket=%d",
 437                      pcmk_rc_str(rc), rc, sock);
 438             return rc;
 439 
 440         } else if (write_rc < unsent_len) {
 441             crm_trace("Sent %lld of %llu bytes remaining",
 442                       (long long) write_rc, (unsigned long long) unsent_len);
 443             unsent += write_rc;
 444             unsent_len -= write_rc;
 445             continue;
 446 
 447         } else {
 448             crm_trace("Sent all %lld bytes remaining: %.100s",
 449                       (long long) write_rc, (char *) (iov->iov_base));
 450             break;
 451         }
 452     }
 453     return pcmk_rc_ok;
 454 }
 455 
 456 // \return Standard Pacemaker return code
 457 static int
 458 remote_send_iovs(pcmk__remote_t *remote, struct iovec *iov, int iovs)
     /*  */
 459 {
 460     int rc = pcmk_rc_ok;
 461 
 462     for (int lpc = 0; (lpc < iovs) && (rc == pcmk_rc_ok); lpc++) {
 463 #ifdef HAVE_GNUTLS_GNUTLS_H
 464         if (remote->tls_session) {
 465             rc = send_tls(remote->tls_session, &(iov[lpc]));
 466             continue;
 467         }
 468 #endif
 469         if (remote->tcp_socket) {
 470             rc = send_plaintext(remote->tcp_socket, &(iov[lpc]));
 471         } else {
 472             rc = ESOCKTNOSUPPORT;
 473         }
 474     }
 475     return rc;
 476 }
 477 
 478 /*!
 479  * \internal
 480  * \brief Send an XML message over a Pacemaker Remote connection
 481  *
 482  * \param[in] remote  Pacemaker Remote connection to use
 483  * \param[in] msg     XML to send
 484  *
 485  * \return Standard Pacemaker return code
 486  */
 487 int
 488 pcmk__remote_send_xml(pcmk__remote_t *remote, xmlNode *msg)
     /*  */
 489 {
 490     int rc = pcmk_rc_ok;
 491     static uint64_t id = 0;
 492     char *xml_text = NULL;
 493 
 494     struct iovec iov[2];
 495     struct remote_header_v0 *header;
 496 
 497     CRM_CHECK((remote != NULL) && (msg != NULL), return EINVAL);
 498 
 499     xml_text = dump_xml_unformatted(msg);
 500     CRM_CHECK(xml_text != NULL, return EINVAL);
 501 
 502     header = calloc(1, sizeof(struct remote_header_v0));
 503     CRM_ASSERT(header != NULL);
 504 
 505     iov[0].iov_base = header;
 506     iov[0].iov_len = sizeof(struct remote_header_v0);
 507 
 508     iov[1].iov_base = xml_text;
 509     iov[1].iov_len = 1 + strlen(xml_text);
 510 
 511     id++;
 512     header->id = id;
 513     header->endian = ENDIAN_LOCAL;
 514     header->version = REMOTE_MSG_VERSION;
 515     header->payload_offset = iov[0].iov_len;
 516     header->payload_uncompressed = iov[1].iov_len;
 517     header->size_total = iov[0].iov_len + iov[1].iov_len;
 518 
 519     rc = remote_send_iovs(remote, iov, 2);
 520     if (rc != pcmk_rc_ok) {
 521         crm_err("Could not send remote message: %s " CRM_XS " rc=%d",
 522                 pcmk_rc_str(rc), rc);
 523     }
 524 
 525     free(iov[0].iov_base);
 526     free(iov[1].iov_base);
 527     return rc;
 528 }
 529 
 530 /*!
 531  * \internal
 532  * \brief Obtain the XML from the currently buffered remote connection message
 533  *
 534  * \param[in] remote  Remote connection possibly with message available
 535  *
 536  * \return Newly allocated XML object corresponding to message data, or NULL
 537  * \note This effectively removes the message from the connection buffer.
 538  */
 539 xmlNode *
 540 pcmk__remote_message_xml(pcmk__remote_t *remote)
     /*  */
 541 {
 542     xmlNode *xml = NULL;
 543     struct remote_header_v0 *header = localized_remote_header(remote);
 544 
 545     if (header == NULL) {
 546         return NULL;
 547     }
 548 
 549     /* Support compression on the receiving end now, in case we ever want to add it later */
 550     if (header->payload_compressed) {
 551         int rc = 0;
 552         unsigned int size_u = 1 + header->payload_uncompressed;
 553         char *uncompressed = calloc(1, header->payload_offset + size_u);
 554 
 555         crm_trace("Decompressing message data %d bytes into %d bytes",
 556                  header->payload_compressed, size_u);
 557 
 558         rc = BZ2_bzBuffToBuffDecompress(uncompressed + header->payload_offset, &size_u,
 559                                         remote->buffer + header->payload_offset,
 560                                         header->payload_compressed, 1, 0);
 561 
 562         if (rc != BZ_OK && header->version > REMOTE_MSG_VERSION) {
 563             crm_warn("Couldn't decompress v%d message, we only understand v%d",
 564                      header->version, REMOTE_MSG_VERSION);
 565             free(uncompressed);
 566             return NULL;
 567 
 568         } else if (rc != BZ_OK) {
 569             crm_err("Decompression failed: %s " CRM_XS " bzerror=%d",
 570                     bz2_strerror(rc), rc);
 571             free(uncompressed);
 572             return NULL;
 573         }
 574 
 575         CRM_ASSERT(size_u == header->payload_uncompressed);
 576 
 577         memcpy(uncompressed, remote->buffer, header->payload_offset);       /* Preserve the header */
 578         remote->buffer_size = header->payload_offset + size_u;
 579 
 580         free(remote->buffer);
 581         remote->buffer = uncompressed;
 582         header = localized_remote_header(remote);
 583     }
 584 
 585     /* take ownership of the buffer */
 586     remote->buffer_offset = 0;
 587 
 588     CRM_LOG_ASSERT(remote->buffer[sizeof(struct remote_header_v0) + header->payload_uncompressed - 1] == 0);
 589 
 590     xml = string2xml(remote->buffer + header->payload_offset);
 591     if (xml == NULL && header->version > REMOTE_MSG_VERSION) {
 592         crm_warn("Couldn't parse v%d message, we only understand v%d",
 593                  header->version, REMOTE_MSG_VERSION);
 594 
 595     } else if (xml == NULL) {
 596         crm_err("Couldn't parse: '%.120s'", remote->buffer + header->payload_offset);
 597     }
 598 
 599     return xml;
 600 }
 601 
 602 static int
 603 get_remote_socket(pcmk__remote_t *remote)
     /*  */
 604 {
 605 #ifdef HAVE_GNUTLS_GNUTLS_H
 606     if (remote->tls_session) {
 607         void *sock_ptr = gnutls_transport_get_ptr(*remote->tls_session);
 608 
 609         return GPOINTER_TO_INT(sock_ptr);
 610     }
 611 #endif
 612 
 613     if (remote->tcp_socket) {
 614         return remote->tcp_socket;
 615     }
 616 
 617     crm_err("Remote connection type undetermined (bug?)");
 618     return -1;
 619 }
 620 
 621 /*!
 622  * \internal
 623  * \brief Wait for a remote session to have data to read
 624  *
 625  * \param[in] remote      Connection to check
 626  * \param[in] timeout_ms  Maximum time (in ms) to wait
 627  *
 628  * \return Standard Pacemaker return code (of particular interest, pcmk_rc_ok if
 629  *         there is data ready to be read, and ETIME if there is no data within
 630  *         the specified timeout)
 631  */
 632 int
 633 pcmk__remote_ready(pcmk__remote_t *remote, int timeout_ms)
     /*  */
 634 {
 635     struct pollfd fds = { 0, };
 636     int sock = 0;
 637     int rc = 0;
 638     time_t start;
 639     int timeout = timeout_ms;
 640 
 641     sock = get_remote_socket(remote);
 642     if (sock <= 0) {
 643         crm_trace("No longer connected");
 644         return ENOTCONN;
 645     }
 646 
 647     start = time(NULL);
 648     errno = 0;
 649     do {
 650         fds.fd = sock;
 651         fds.events = POLLIN;
 652 
 653         /* If we got an EINTR while polling, and we have a
 654          * specific timeout we are trying to honor, attempt
 655          * to adjust the timeout to the closest second. */
 656         if (errno == EINTR && (timeout > 0)) {
 657             timeout = timeout_ms - ((time(NULL) - start) * 1000);
 658             if (timeout < 1000) {
 659                 timeout = 1000;
 660             }
 661         }
 662 
 663         rc = poll(&fds, 1, timeout);
 664     } while (rc < 0 && errno == EINTR);
 665 
 666     if (rc < 0) {
 667         return errno;
 668     }
 669     return (rc == 0)? ETIME : pcmk_rc_ok;
 670 }
 671 
 672 /*!
 673  * \internal
 674  * \brief Read bytes from non-blocking remote connection
 675  *
 676  * \param[in] remote  Remote connection to read
 677  *
 678  * \return Standard Pacemaker return code (of particular interest, pcmk_rc_ok if
 679  *         a full message has been received, or EAGAIN for a partial message)
 680  * \note Use only with non-blocking sockets after polling the socket.
 681  * \note This function will return when the socket read buffer is empty or an
 682  *       error is encountered.
 683  */
 684 static int
 685 read_available_remote_data(pcmk__remote_t *remote)
     /*  */
 686 {
 687     int rc = pcmk_rc_ok;
 688     size_t read_len = sizeof(struct remote_header_v0);
 689     struct remote_header_v0 *header = localized_remote_header(remote);
 690     bool received = false;
 691     ssize_t read_rc;
 692 
 693     if(header) {
 694         /* Stop at the end of the current message */
 695         read_len = header->size_total;
 696     }
 697 
 698     /* automatically grow the buffer when needed */
 699     if(remote->buffer_size < read_len) {
 700         remote->buffer_size = 2 * read_len;
 701         crm_trace("Expanding buffer to %llu bytes",
 702                   (unsigned long long) remote->buffer_size);
 703         remote->buffer = pcmk__realloc(remote->buffer, remote->buffer_size + 1);
 704     }
 705 
 706 #ifdef HAVE_GNUTLS_GNUTLS_H
 707     if (!received && remote->tls_session) {
 708         read_rc = gnutls_record_recv(*(remote->tls_session),
 709                                      remote->buffer + remote->buffer_offset,
 710                                      remote->buffer_size - remote->buffer_offset);
 711         if (read_rc == GNUTLS_E_INTERRUPTED) {
 712             rc = EINTR;
 713         } else if (read_rc == GNUTLS_E_AGAIN) {
 714             rc = EAGAIN;
 715         } else if (read_rc < 0) {
 716             crm_debug("TLS receive failed: %s (%lld)",
 717                       gnutls_strerror(read_rc), (long long) read_rc);
 718             rc = EIO;
 719         }
 720         received = true;
 721     }
 722 #endif
 723 
 724     if (!received && remote->tcp_socket) {
 725         read_rc = read(remote->tcp_socket,
 726                        remote->buffer + remote->buffer_offset,
 727                        remote->buffer_size - remote->buffer_offset);
 728         if (read_rc < 0) {
 729             rc = errno;
 730         }
 731         received = true;
 732     }
 733 
 734     if (!received) {
 735         crm_err("Remote connection type undetermined (bug?)");
 736         return ESOCKTNOSUPPORT;
 737     }
 738 
 739     /* process any errors. */
 740     if (read_rc > 0) {
 741         remote->buffer_offset += read_rc;
 742         /* always null terminate buffer, the +1 to alloc always allows for this. */
 743         remote->buffer[remote->buffer_offset] = '\0';
 744         crm_trace("Received %lld more bytes (%llu total)",
 745                   (long long) read_rc,
 746                   (unsigned long long) remote->buffer_offset);
 747 
 748     } else if ((rc == EINTR) || (rc == EAGAIN)) {
 749         crm_trace("No data available for non-blocking remote read: %s (%d)",
 750                   pcmk_rc_str(rc), rc);
 751 
 752     } else if (read_rc == 0) {
 753         crm_debug("End of remote data encountered after %llu bytes",
 754                   (unsigned long long) remote->buffer_offset);
 755         return ENOTCONN;
 756 
 757     } else {
 758         crm_debug("Error receiving remote data after %llu bytes: %s (%d)",
 759                   (unsigned long long) remote->buffer_offset,
 760                   pcmk_rc_str(rc), rc);
 761         return ENOTCONN;
 762     }
 763 
 764     header = localized_remote_header(remote);
 765     if(header) {
 766         if(remote->buffer_offset < header->size_total) {
 767             crm_trace("Read partial remote message (%llu of %u bytes)",
 768                       (unsigned long long) remote->buffer_offset,
 769                       header->size_total);
 770         } else {
 771             crm_trace("Read full remote message of %llu bytes",
 772                       (unsigned long long) remote->buffer_offset);
 773             return pcmk_rc_ok;
 774         }
 775     }
 776 
 777     return EAGAIN;
 778 }
 779 
 780 /*!
 781  * \internal
 782  * \brief Read one message from a remote connection
 783  *
 784  * \param[in]  remote      Remote connection to read
 785  * \param[in]  timeout_ms  Fail if message not read in this many milliseconds
 786  *                         (10s will be used if 0, and 60s if negative)
 787  *
 788  * \return Standard Pacemaker return code
 789  */
 790 int
 791 pcmk__read_remote_message(pcmk__remote_t *remote, int timeout_ms)
     /*  */
 792 {
 793     int rc = pcmk_rc_ok;
 794     time_t start = time(NULL);
 795     int remaining_timeout = 0;
 796 
 797     if (timeout_ms == 0) {
 798         timeout_ms = 10000;
 799     } else if (timeout_ms < 0) {
 800         timeout_ms = 60000;
 801     }
 802 
 803     remaining_timeout = timeout_ms;
 804     while (remaining_timeout > 0) {
 805 
 806         crm_trace("Waiting for remote data (%d ms of %d ms timeout remaining)",
 807                   remaining_timeout, timeout_ms);
 808         rc = pcmk__remote_ready(remote, remaining_timeout);
 809 
 810         if (rc == ETIME) {
 811             crm_err("Timed out (%d ms) while waiting for remote data",
 812                     remaining_timeout);
 813             return rc;
 814 
 815         } else if (rc != pcmk_rc_ok) {
 816             crm_debug("Wait for remote data aborted (will retry): %s "
 817                       CRM_XS " rc=%d", pcmk_rc_str(rc), rc);
 818 
 819         } else {
 820             rc = read_available_remote_data(remote);
 821             if (rc == pcmk_rc_ok) {
 822                 return rc;
 823             } else if (rc == EAGAIN) {
 824                 crm_trace("Waiting for more remote data");
 825             } else {
 826                 crm_debug("Could not receive remote data: %s " CRM_XS " rc=%d",
 827                           pcmk_rc_str(rc), rc);
 828             }
 829         }
 830 
 831         // Don't waste time retrying after fatal errors
 832         if ((rc == ENOTCONN) || (rc == ESOCKTNOSUPPORT)) {
 833             return rc;
 834         }
 835 
 836         remaining_timeout = timeout_ms - ((time(NULL) - start) * 1000);
 837     }
 838     return ETIME;
 839 }
 840 
 841 struct tcp_async_cb_data {
 842     int sock;
 843     int timeout_ms;
 844     time_t start;
 845     void *userdata;
 846     void (*callback) (void *userdata, int rc, int sock);
 847 };
 848 
 849 // \return TRUE if timer should be rescheduled, FALSE otherwise
 850 static gboolean
 851 check_connect_finished(gpointer userdata)
     /*  */
 852 {
 853     struct tcp_async_cb_data *cb_data = userdata;
 854     int rc;
 855 
 856     fd_set rset, wset;
 857     struct timeval ts = { 0, };
 858 
 859     if (cb_data->start == 0) {
 860         // Last connect() returned success immediately
 861         rc = pcmk_rc_ok;
 862         goto dispatch_done;
 863     }
 864 
 865     // If the socket is ready for reading or writing, the connect succeeded
 866     FD_ZERO(&rset);
 867     FD_SET(cb_data->sock, &rset);
 868     wset = rset;
 869     rc = select(cb_data->sock + 1, &rset, &wset, NULL, &ts);
 870 
 871     if (rc < 0) { // select() error
 872         rc = errno;
 873         if ((rc == EINPROGRESS) || (rc == EAGAIN)) {
 874             if ((time(NULL) - cb_data->start) < (cb_data->timeout_ms / 1000)) {
 875                 return TRUE; // There is time left, so reschedule timer
 876             } else {
 877                 rc = ETIMEDOUT;
 878             }
 879         }
 880         crm_trace("Could not check socket %d for connection success: %s (%d)",
 881                   cb_data->sock, pcmk_rc_str(rc), rc);
 882 
 883     } else if (rc == 0) { // select() timeout
 884         if ((time(NULL) - cb_data->start) < (cb_data->timeout_ms / 1000)) {
 885             return TRUE; // There is time left, so reschedule timer
 886         }
 887         crm_debug("Timed out while waiting for socket %d connection success",
 888                   cb_data->sock);
 889         rc = ETIMEDOUT;
 890 
 891     // select() returned number of file descriptors that are ready
 892 
 893     } else if (FD_ISSET(cb_data->sock, &rset)
 894                || FD_ISSET(cb_data->sock, &wset)) {
 895 
 896         // The socket is ready; check it for connection errors
 897         int error = 0;
 898         socklen_t len = sizeof(error);
 899 
 900         if (getsockopt(cb_data->sock, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
 901             rc = errno;
 902             crm_trace("Couldn't check socket %d for connection errors: %s (%d)",
 903                       cb_data->sock, pcmk_rc_str(rc), rc);
 904         } else if (error != 0) {
 905             rc = error;
 906             crm_trace("Socket %d connected with error: %s (%d)",
 907                       cb_data->sock, pcmk_rc_str(rc), rc);
 908         } else {
 909             rc = pcmk_rc_ok;
 910         }
 911 
 912     } else { // Should not be possible
 913         crm_trace("select() succeeded, but socket %d not in resulting "
 914                   "read/write sets", cb_data->sock);
 915         rc = EAGAIN;
 916     }
 917 
 918   dispatch_done:
 919     if (rc == pcmk_rc_ok) {
 920         crm_trace("Socket %d is connected", cb_data->sock);
 921     } else {
 922         close(cb_data->sock);
 923         cb_data->sock = -1;
 924     }
 925 
 926     if (cb_data->callback) {
 927         cb_data->callback(cb_data->userdata, rc, cb_data->sock);
 928     }
 929     free(cb_data);
 930     return FALSE; // Do not reschedule timer
 931 }
 932 
 933 /*!
 934  * \internal
 935  * \brief Attempt to connect socket, calling callback when done
 936  *
 937  * Set a given socket non-blocking, then attempt to connect to it,
 938  * retrying periodically until success or a timeout is reached.
 939  * Call a caller-supplied callback function when completed.
 940  *
 941  * \param[in]  sock        Newly created socket
 942  * \param[in]  addr        Socket address information for connect
 943  * \param[in]  addrlen     Size of socket address information in bytes
 944  * \param[in]  timeout_ms  Fail if not connected within this much time
 945  * \param[out] timer_id    If not NULL, store retry timer ID here
 946  * \param[in]  userdata    User data to pass to callback
 947  * \param[in]  callback    Function to call when connection attempt completes
 948  *
 949  * \return Standard Pacemaker return code
 950  */
 951 static int
 952 connect_socket_retry(int sock, const struct sockaddr *addr, socklen_t addrlen,
     /*  */
 953                      int timeout_ms, int *timer_id, void *userdata,
 954                      void (*callback) (void *userdata, int rc, int sock))
 955 {
 956     int rc = 0;
 957     int interval = 500;
 958     int timer;
 959     struct tcp_async_cb_data *cb_data = NULL;
 960 
 961     rc = pcmk__set_nonblocking(sock);
 962     if (rc != pcmk_rc_ok) {
 963         crm_warn("Could not set socket non-blocking: %s " CRM_XS " rc=%d",
 964                  pcmk_rc_str(rc), rc);
 965         return rc;
 966     }
 967 
 968     rc = connect(sock, addr, addrlen);
 969     if (rc < 0 && (errno != EINPROGRESS) && (errno != EAGAIN)) {
 970         rc = errno;
 971         crm_warn("Could not connect socket: %s " CRM_XS " rc=%d",
 972                  pcmk_rc_str(rc), rc);
 973         return rc;
 974     }
 975 
 976     cb_data = calloc(1, sizeof(struct tcp_async_cb_data));
 977     cb_data->userdata = userdata;
 978     cb_data->callback = callback;
 979     cb_data->sock = sock;
 980     cb_data->timeout_ms = timeout_ms;
 981 
 982     if (rc == 0) {
 983         /* The connect was successful immediately, we still return to mainloop
 984          * and let this callback get called later. This avoids the user of this api
 985          * to have to account for the fact the callback could be invoked within this
 986          * function before returning. */
 987         cb_data->start = 0;
 988         interval = 1;
 989     } else {
 990         cb_data->start = time(NULL);
 991     }
 992 
 993     /* This timer function does a non-blocking poll on the socket to see if we
 994      * can use it. Once we can, the connect has completed. This method allows us
 995      * to connect without blocking the mainloop.
 996      *
 997      * @TODO Use a mainloop fd callback for this instead of polling. Something
 998      *       about the way mainloop is currently polling prevents this from
 999      *       working at the moment though. (See connect(2) regarding EINPROGRESS
1000      *       for possible new handling needed.)
1001      */
1002     crm_trace("Scheduling check in %dms for whether connect to fd %d finished",
1003               interval, sock);
1004     timer = g_timeout_add(interval, check_connect_finished, cb_data);
1005     if (timer_id) {
1006         *timer_id = timer;
1007     }
1008 
1009     // timer callback should be taking care of cb_data
1010     // cppcheck-suppress memleak
1011     return pcmk_rc_ok;
1012 }
1013 
1014 /*!
1015  * \internal
1016  * \brief Attempt once to connect socket and set it non-blocking
1017  *
1018  * \param[in]  sock        Newly created socket
1019  * \param[in]  addr        Socket address information for connect
1020  * \param[in]  addrlen     Size of socket address information in bytes
1021  *
1022  * \return Standard Pacemaker return code
1023  */
1024 static int
1025 connect_socket_once(int sock, const struct sockaddr *addr, socklen_t addrlen)
     /*  */
1026 {
1027     int rc = connect(sock, addr, addrlen);
1028 
1029     if (rc < 0) {
1030         rc = errno;
1031         crm_warn("Could not connect socket: %s " CRM_XS " rc=%d",
1032                  pcmk_rc_str(rc), rc);
1033         return rc;
1034     }
1035 
1036     rc = pcmk__set_nonblocking(sock);
1037     if (rc != pcmk_rc_ok) {
1038         crm_warn("Could not set socket non-blocking: %s " CRM_XS " rc=%d",
1039                  pcmk_rc_str(rc), rc);
1040         return rc;
1041     }
1042 
1043     return pcmk_ok;
1044 }
1045 
1046 /*!
1047  * \internal
1048  * \brief Connect to server at specified TCP port
1049  *
1050  * \param[in]  host        Name of server to connect to
1051  * \param[in]  port        Server port to connect to
1052  * \param[in]  timeout_ms  If asynchronous, fail if not connected in this time
1053  * \param[out] timer_id    If asynchronous and this is non-NULL, retry timer ID
1054  *                         will be put here (for ease of cancelling by caller)
1055  * \param[out] sock_fd     Where to store socket file descriptor
1056  * \param[in]  userdata    If asynchronous, data to pass to callback
1057  * \param[in]  callback    If NULL, attempt a single synchronous connection,
1058  *                         otherwise retry asynchronously then call this
1059  *
1060  * \return Standard Pacemaker return code
1061  */
1062 int
1063 pcmk__connect_remote(const char *host, int port, int timeout, int *timer_id,
     /*  */
1064                      int *sock_fd, void *userdata,
1065                      void (*callback) (void *userdata, int rc, int sock))
1066 {
1067     char buffer[INET6_ADDRSTRLEN];
1068     struct addrinfo *res = NULL;
1069     struct addrinfo *rp = NULL;
1070     struct addrinfo hints;
1071     const char *server = host;
1072     int rc;
1073     int sock = -1;
1074 
1075     CRM_CHECK((host != NULL) && (sock_fd != NULL), return EINVAL);
1076 
1077     // Get host's IP address(es)
1078     memset(&hints, 0, sizeof(struct addrinfo));
1079     hints.ai_family = AF_UNSPEC;        /* Allow IPv4 or IPv6 */
1080     hints.ai_socktype = SOCK_STREAM;
1081     hints.ai_flags = AI_CANONNAME;
1082     rc = getaddrinfo(server, NULL, &hints, &res);
1083     if (rc != 0) {
1084         crm_err("Unable to get IP address info for %s: %s",
1085                 server, gai_strerror(rc));
1086         rc = ENOTCONN;
1087         goto async_cleanup;
1088     }
1089     if (!res || !res->ai_addr) {
1090         crm_err("Unable to get IP address info for %s: no result", server);
1091         rc = ENOTCONN;
1092         goto async_cleanup;
1093     }
1094 
1095     // getaddrinfo() returns a list of host's addresses, try them in order
1096     for (rp = res; rp != NULL; rp = rp->ai_next) {
1097         struct sockaddr *addr = rp->ai_addr;
1098 
1099         if (!addr) {
1100             continue;
1101         }
1102 
1103         if (rp->ai_canonname) {
1104             server = res->ai_canonname;
1105         }
1106         crm_debug("Got canonical name %s for %s", server, host);
1107 
1108         sock = socket(rp->ai_family, SOCK_STREAM, IPPROTO_TCP);
1109         if (sock == -1) {
1110             rc = errno;
1111             crm_warn("Could not create socket for remote connection to %s:%d: "
1112                      "%s " CRM_XS " rc=%d", server, port, pcmk_rc_str(rc), rc);
1113             continue;
1114         }
1115 
1116         /* Set port appropriately for address family */
1117         /* (void*) casts avoid false-positive compiler alignment warnings */
1118         if (addr->sa_family == AF_INET6) {
1119             ((struct sockaddr_in6 *)(void*)addr)->sin6_port = htons(port);
1120         } else {
1121             ((struct sockaddr_in *)(void*)addr)->sin_port = htons(port);
1122         }
1123 
1124         memset(buffer, 0, PCMK__NELEM(buffer));
1125         pcmk__sockaddr2str(addr, buffer);
1126         crm_info("Attempting remote connection to %s:%d", buffer, port);
1127 
1128         if (callback) {
1129             if (connect_socket_retry(sock, rp->ai_addr, rp->ai_addrlen, timeout,
1130                                      timer_id, userdata, callback) == pcmk_rc_ok) {
1131                 goto async_cleanup; /* Success for now, we'll hear back later in the callback */
1132             }
1133 
1134         } else if (connect_socket_once(sock, rp->ai_addr,
1135                                        rp->ai_addrlen) == pcmk_rc_ok) {
1136             break;          /* Success */
1137         }
1138 
1139         // Connect failed
1140         close(sock);
1141         sock = -1;
1142         rc = ENOTCONN;
1143     }
1144 
1145 async_cleanup:
1146 
1147     if (res) {
1148         freeaddrinfo(res);
1149     }
1150     *sock_fd = sock;
1151     return rc;
1152 }
1153 
1154 /*!
1155  * \internal
1156  * \brief Convert an IP address (IPv4 or IPv6) to a string for logging
1157  *
1158  * \param[in]  sa  Socket address for IP
1159  * \param[out] s   Storage for at least INET6_ADDRSTRLEN bytes
1160  *
1161  * \note sa The socket address can be a pointer to struct sockaddr_in (IPv4),
1162  *          struct sockaddr_in6 (IPv6) or struct sockaddr_storage (either),
1163  *          as long as its sa_family member is set correctly.
1164  */
1165 void
1166 pcmk__sockaddr2str(void *sa, char *s)
     /*  */
1167 {
1168     switch (((struct sockaddr*)sa)->sa_family) {
1169         case AF_INET:
1170             inet_ntop(AF_INET, &(((struct sockaddr_in *)sa)->sin_addr),
1171                       s, INET6_ADDRSTRLEN);
1172             break;
1173 
1174         case AF_INET6:
1175             inet_ntop(AF_INET6, &(((struct sockaddr_in6 *)sa)->sin6_addr),
1176                       s, INET6_ADDRSTRLEN);
1177             break;
1178 
1179         default:
1180             strcpy(s, "<invalid>");
1181     }
1182 }
1183 
1184 /*!
1185  * \internal
1186  * \brief Accept a client connection on a remote server socket
1187  *
1188  * \param[in]  ssock  Server socket file descriptor being listened on
1189  * \param[out] csock  Where to put new client socket's file descriptor
1190  *
1191  * \return Standard Pacemaker return code
1192  */
1193 int
1194 pcmk__accept_remote_connection(int ssock, int *csock)
     /*  */
1195 {
1196     int rc;
1197     struct sockaddr_storage addr;
1198     socklen_t laddr = sizeof(addr);
1199     char addr_str[INET6_ADDRSTRLEN];
1200 
1201     /* accept the connection */
1202     memset(&addr, 0, sizeof(addr));
1203     *csock = accept(ssock, (struct sockaddr *)&addr, &laddr);
1204     if (*csock == -1) {
1205         rc = errno;
1206         crm_err("Could not accept remote client connection: %s "
1207                 CRM_XS " rc=%d", pcmk_rc_str(rc), rc);
1208         return rc;
1209     }
1210     pcmk__sockaddr2str(&addr, addr_str);
1211     crm_info("Accepted new remote client connection from %s", addr_str);
1212 
1213     rc = pcmk__set_nonblocking(*csock);
1214     if (rc != pcmk_rc_ok) {
1215         crm_err("Could not set socket non-blocking: %s " CRM_XS " rc=%d",
1216                 pcmk_rc_str(rc), rc);
1217         close(*csock);
1218         *csock = -1;
1219         return rc;
1220     }
1221 
1222 #ifdef TCP_USER_TIMEOUT
1223     if (pcmk__get_sbd_timeout() > 0) {
1224         // Time to fail and retry before watchdog
1225         unsigned int optval = (unsigned int) pcmk__get_sbd_timeout() / 2;
1226 
1227         rc = setsockopt(*csock, SOL_TCP, TCP_USER_TIMEOUT,
1228                         &optval, sizeof(optval));
1229         if (rc < 0) {
1230             rc = errno;
1231             crm_err("Could not set TCP timeout to %d ms on remote connection: "
1232                     "%s " CRM_XS " rc=%d", optval, pcmk_rc_str(rc), rc);
1233             close(*csock);
1234             *csock = -1;
1235             return rc;
1236         }
1237     }
1238 #endif
1239 
1240     return rc;
1241 }
1242 
1243 /*!
1244  * \brief Get the default remote connection TCP port on this host
1245  *
1246  * \return Remote connection TCP port number
1247  */
1248 int
1249 crm_default_remote_port()
     /*  */
1250 {
1251     static int port = 0;
1252 
1253     if (port == 0) {
1254         const char *env = getenv("PCMK_remote_port");
1255 
1256         if (env) {
1257             errno = 0;
1258             port = strtol(env, NULL, 10);
1259             if (errno || (port < 1) || (port > 65535)) {
1260                 crm_warn("Environment variable PCMK_remote_port has invalid value '%s', using %d instead",
1261                          env, DEFAULT_REMOTE_PORT);
1262                 port = DEFAULT_REMOTE_PORT;
1263             }
1264         } else {
1265             port = DEFAULT_REMOTE_PORT;
1266         }
1267     }
1268     return port;
1269 }
/* */
root/lib/common/remote.c

DEFINITIONS
