diff --git a/lib/common/remote.c b/lib/common/remote.c index ceb84539ca..122bc5dfe0 100644 --- a/lib/common/remote.c +++ b/lib/common/remote.c @@ -1,1212 +1,1198 @@ /* * Copyright 2008-2020 the Pacemaker project contributors * * The version control history for this file may have further details. * * This source code is licensed under the GNU Lesser General Public License * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* X32T ~ PRIx32 */ #include #include #include #include #include #include #ifdef HAVE_GNUTLS_GNUTLS_H -# undef KEYFILE # include - -const int psk_tls_kx_order[] = { - GNUTLS_KX_DHE_PSK, - GNUTLS_KX_PSK, -}; - -const int anon_tls_kx_order[] = { - GNUTLS_KX_ANON_DH, - GNUTLS_KX_DHE_RSA, - GNUTLS_KX_DHE_DSS, - GNUTLS_KX_RSA, - 0 -}; #endif /* Swab macros from linux/swab.h */ #ifdef HAVE_LINUX_SWAB_H # include #else /* * casts are necessary for constants, because we never know how for sure * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. */ #define __swab16(x) ((uint16_t)( \ (((uint16_t)(x) & (uint16_t)0x00ffU) << 8) | \ (((uint16_t)(x) & (uint16_t)0xff00U) >> 8))) #define __swab32(x) ((uint32_t)( \ (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \ (((uint32_t)(x) & (uint32_t)0x0000ff00UL) << 8) | \ (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) | \ (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24))) #define __swab64(x) ((uint64_t)( \ (((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \ (((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \ (((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \ (((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) | \ (((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \ (((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \ (((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \ (((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56))) #endif #define REMOTE_MSG_VERSION 1 #define ENDIAN_LOCAL 0xBADADBBD struct crm_remote_header_v0 { uint32_t endian; /* Detect messages from hosts with different endian-ness */ uint32_t version; uint64_t id; uint64_t flags; uint32_t size_total; uint32_t payload_offset; uint32_t payload_compressed; uint32_t payload_uncompressed; /* New fields get added here */ } __attribute__ ((packed)); static struct crm_remote_header_v0 * crm_remote_header(pcmk__remote_t *remote) { struct crm_remote_header_v0 *header = (struct crm_remote_header_v0 *)remote->buffer; if(remote->buffer_offset < sizeof(struct crm_remote_header_v0)) { return NULL; } else if(header->endian != ENDIAN_LOCAL) { uint32_t endian = __swab32(header->endian); CRM_LOG_ASSERT(endian == ENDIAN_LOCAL); if(endian != ENDIAN_LOCAL) { crm_err("Invalid message detected, endian mismatch: %" X32T " is neither %" X32T " nor the swab'd %" X32T, ENDIAN_LOCAL, header->endian, endian); return NULL; } header->id = __swab64(header->id); header->flags = __swab64(header->flags); header->endian = __swab32(header->endian); header->version = __swab32(header->version); header->size_total = __swab32(header->size_total); header->payload_offset = __swab32(header->payload_offset); header->payload_compressed = __swab32(header->payload_compressed); header->payload_uncompressed = __swab32(header->payload_uncompressed); } return header; } #ifdef HAVE_GNUTLS_GNUTLS_H int crm_initiate_client_tls_handshake(pcmk__remote_t *remote, int timeout_ms) { int rc = 0; int pollrc = 0; time_t start = time(NULL); do { rc = gnutls_handshake(*remote->tls_session); if (rc == GNUTLS_E_INTERRUPTED || rc == GNUTLS_E_AGAIN) { pollrc = crm_remote_ready(remote, 1000); if (pollrc < 0) { /* poll returned error, there is no hope */ rc = -1; } } } while (((time(NULL) - start) < (timeout_ms / 1000)) && (rc == GNUTLS_E_INTERRUPTED || rc == GNUTLS_E_AGAIN)); if (rc < 0) { crm_trace("gnutls_handshake() failed with %d", rc); } return rc; } /*! * \internal * \brief Set minimum prime size required by TLS client * * \param[in] session TLS session to affect */ static void pcmk__set_minimum_dh_bits(gnutls_session_t *session) { const char *dh_min_bits_s = getenv("PCMK_dh_min_bits"); if (dh_min_bits_s) { int dh_min_bits = crm_parse_int(dh_min_bits_s, "0"); /* This function is deprecated since GnuTLS 3.1.7, in favor of letting * the priority string imply the DH requirements, but this is the only * way to give the user control over compatibility with older servers. */ if (dh_min_bits > 0) { crm_info("Requiring server use a Diffie-Hellman prime of at least %d bits", dh_min_bits); gnutls_dh_set_prime_bits(*session, dh_min_bits); } } } static unsigned int pcmk__bound_dh_bits(unsigned int dh_bits) { const char *dh_min_bits_s = getenv("PCMK_dh_min_bits"); const char *dh_max_bits_s = getenv("PCMK_dh_max_bits"); int dh_min_bits = 0; int dh_max_bits = 0; if (dh_min_bits_s) { dh_min_bits = crm_parse_int(dh_min_bits_s, "0"); } if (dh_max_bits_s) { dh_max_bits = crm_parse_int(dh_max_bits_s, "0"); if ((dh_min_bits > 0) && (dh_max_bits > 0) && (dh_max_bits < dh_min_bits)) { crm_warn("Ignoring PCMK_dh_max_bits because it is less than PCMK_dh_min_bits"); dh_max_bits = 0; } } if ((dh_min_bits > 0) && (dh_bits < dh_min_bits)) { return dh_min_bits; } if ((dh_max_bits > 0) && (dh_bits > dh_max_bits)) { return dh_max_bits; } return dh_bits; } /*! * \internal * \brief Initialize a new TLS session * * \param[in] csock Connected socket for TLS session * \param[in] conn_type GNUTLS_SERVER or GNUTLS_CLIENT * \param[in] cred_type GNUTLS_CRD_ANON or GNUTLS_CRD_PSK * \param[in] credentials TLS session credentials * * \return Pointer to newly created session object, or NULL on error */ gnutls_session_t * pcmk__new_tls_session(int csock, unsigned int conn_type, gnutls_credentials_type_t cred_type, void *credentials) { int rc = GNUTLS_E_SUCCESS; const char *prio_base = NULL; char *prio = NULL; gnutls_session_t *session = NULL; /* Determine list of acceptable ciphers, etc. Pacemaker always adds the * values required for its functionality. * * For an example of anonymous authentication, see: * http://www.manpagez.com/info/gnutls/gnutls-2.10.4/gnutls_81.php#Echo-Server-with-anonymous-authentication */ prio_base = getenv("PCMK_tls_priorities"); if (prio_base == NULL) { prio_base = PCMK_GNUTLS_PRIORITIES; } prio = crm_strdup_printf("%s:%s", prio_base, (cred_type == GNUTLS_CRD_ANON)? "+ANON-DH" : "+DHE-PSK:+PSK"); session = gnutls_malloc(sizeof(gnutls_session_t)); if (session == NULL) { rc = GNUTLS_E_MEMORY_ERROR; goto error; } rc = gnutls_init(session, conn_type); if (rc != GNUTLS_E_SUCCESS) { goto error; } /* @TODO On the server side, it would be more efficient to cache the * priority with gnutls_priority_init2() and set it with * gnutls_priority_set() for all sessions. */ rc = gnutls_priority_set_direct(*session, prio, NULL); if (rc != GNUTLS_E_SUCCESS) { goto error; } if (conn_type == GNUTLS_CLIENT) { pcmk__set_minimum_dh_bits(session); } gnutls_transport_set_ptr(*session, (gnutls_transport_ptr_t) GINT_TO_POINTER(csock)); rc = gnutls_credentials_set(*session, cred_type, credentials); if (rc != GNUTLS_E_SUCCESS) { goto error; } free(prio); return session; error: crm_err("Could not initialize %s TLS %s session: %s " CRM_XS " rc=%d priority='%s'", (cred_type == GNUTLS_CRD_ANON)? "anonymous" : "PSK", (conn_type == GNUTLS_SERVER)? "server" : "client", gnutls_strerror(rc), rc, prio); free(prio); if (session != NULL) { gnutls_free(session); } return NULL; } /*! * \internal * \brief Initialize Diffie-Hellman parameters for a TLS server * * \param[out] dh_params Parameter object to initialize * * \return GNUTLS_E_SUCCESS on success, GnuTLS error code on error * \todo The current best practice is to allow the client and server to * negotiate the Diffie-Hellman parameters via a TLS extension (RFC 7919). * However, we have to support both older versions of GnuTLS (<3.6) that * don't support the extension on our side, and older Pacemaker versions * that don't support the extension on the other side. The next best * practice would be to use a known good prime (see RFC 5114 section 2.2), * possibly stored in a file distributed with Pacemaker. */ int pcmk__init_tls_dh(gnutls_dh_params_t *dh_params) { int rc = GNUTLS_E_SUCCESS; unsigned int dh_bits = 0; rc = gnutls_dh_params_init(dh_params); if (rc != GNUTLS_E_SUCCESS) { goto error; } #ifdef HAVE_GNUTLS_SEC_PARAM_TO_PK_BITS dh_bits = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, GNUTLS_SEC_PARAM_NORMAL); if (dh_bits == 0) { rc = GNUTLS_E_DH_PRIME_UNACCEPTABLE; goto error; } #else dh_bits = 1024; #endif dh_bits = pcmk__bound_dh_bits(dh_bits); crm_info("Generating Diffie-Hellman parameters with %u-bit prime for TLS", dh_bits); rc = gnutls_dh_params_generate2(*dh_params, dh_bits); if (rc != GNUTLS_E_SUCCESS) { goto error; } return rc; error: crm_err("Could not initialize Diffie-Hellman parameters for TLS: %s " CRM_XS " rc=%d", gnutls_strerror(rc), rc); CRM_ASSERT(rc == GNUTLS_E_SUCCESS); return rc; } /*! * \internal * \brief Process handshake data from TLS client * * Read as much TLS handshake data as is available. * * \param[in] client Client connection * * \retval GnuTLS error code on error * \retval 0 if more data is needed * \retval 1 if handshake is successfully completed */ int pcmk__read_handshake_data(pcmk__client_t *client) { int rc = 0; CRM_ASSERT(client && client->remote && client->remote->tls_session); do { rc = gnutls_handshake(*client->remote->tls_session); } while (rc == GNUTLS_E_INTERRUPTED); if (rc == GNUTLS_E_AGAIN) { /* No more data is available at the moment. This function should be * invoked again once the client sends more. */ return 0; } else if (rc != GNUTLS_E_SUCCESS) { return rc; } return 1; } static int crm_send_tls(gnutls_session_t * session, const char *buf, size_t len) { const char *unsent = buf; int rc = 0; int total_send; if (buf == NULL) { return -EINVAL; } total_send = len; crm_trace("Message size: %llu", (unsigned long long) len); while (TRUE) { rc = gnutls_record_send(*session, unsent, len); if (rc == GNUTLS_E_INTERRUPTED || rc == GNUTLS_E_AGAIN) { crm_trace("Retrying to send %llu bytes", (unsigned long long) len); } else if (rc < 0) { // Caller can log as error if necessary crm_info("TLS connection terminated: %s " CRM_XS " rc=%d", gnutls_strerror(rc), rc); rc = -ECONNABORTED; break; } else if (rc < len) { crm_debug("Sent %d of %llu bytes", rc, (unsigned long long) len); len -= rc; unsent += rc; } else { crm_trace("Sent all %d bytes", rc); break; } } return rc < 0 ? rc : total_send; } #endif static int crm_send_plaintext(int sock, const char *buf, size_t len) { int rc = 0; const char *unsent = buf; int total_send; if (buf == NULL) { return -EINVAL; } total_send = len; crm_trace("Message on socket %d: size=%llu", sock, (unsigned long long) len); retry: rc = write(sock, unsent, len); if (rc < 0) { rc = -errno; switch (errno) { case EINTR: case EAGAIN: crm_trace("Retry"); goto retry; default: crm_perror(LOG_INFO, "Could only write %d of the remaining %llu bytes", rc, (unsigned long long) len); break; } } else if (rc < len) { crm_trace("Only sent %d of %llu remaining bytes", rc, (unsigned long long) len); len -= rc; unsent += rc; goto retry; } else { crm_trace("Sent %d bytes: %.100s", rc, buf); } return rc < 0 ? rc : total_send; } static int crm_remote_sendv(pcmk__remote_t *remote, struct iovec * iov, int iovs) { int rc = 0; for (int lpc = 0; (lpc < iovs) && (rc >= 0); lpc++) { #ifdef HAVE_GNUTLS_GNUTLS_H if (remote->tls_session) { rc = crm_send_tls(remote->tls_session, iov[lpc].iov_base, iov[lpc].iov_len); continue; } #endif if (remote->tcp_socket) { rc = crm_send_plaintext(remote->tcp_socket, iov[lpc].iov_base, iov[lpc].iov_len); } else { rc = -ESOCKTNOSUPPORT; } } return rc; } int crm_remote_send(pcmk__remote_t *remote, xmlNode *msg) { int rc = pcmk_ok; static uint64_t id = 0; char *xml_text = dump_xml_unformatted(msg); struct iovec iov[2]; struct crm_remote_header_v0 *header; if (xml_text == NULL) { crm_err("Could not send remote message: no message provided"); return -EINVAL; } header = calloc(1, sizeof(struct crm_remote_header_v0)); iov[0].iov_base = header; iov[0].iov_len = sizeof(struct crm_remote_header_v0); iov[1].iov_base = xml_text; iov[1].iov_len = 1 + strlen(xml_text); id++; header->id = id; header->endian = ENDIAN_LOCAL; header->version = REMOTE_MSG_VERSION; header->payload_offset = iov[0].iov_len; header->payload_uncompressed = iov[1].iov_len; header->size_total = iov[0].iov_len + iov[1].iov_len; crm_trace("Sending len[0]=%d, start=%x", (int)iov[0].iov_len, *(int*)(void*)xml_text); rc = crm_remote_sendv(remote, iov, 2); if (rc < 0) { crm_err("Could not send remote message: %s " CRM_XS " rc=%d", pcmk_strerror(rc), rc); } free(iov[0].iov_base); free(iov[1].iov_base); return rc; } /*! * \internal * \brief handles the recv buffer and parsing out msgs. * \note new_data is owned by this function once it is passed in. */ xmlNode * crm_remote_parse_buffer(pcmk__remote_t *remote) { xmlNode *xml = NULL; struct crm_remote_header_v0 *header = crm_remote_header(remote); if (remote->buffer == NULL || header == NULL) { return NULL; } /* Support compression on the receiving end now, in case we ever want to add it later */ if (header->payload_compressed) { int rc = 0; unsigned int size_u = 1 + header->payload_uncompressed; char *uncompressed = calloc(1, header->payload_offset + size_u); crm_trace("Decompressing message data %d bytes into %d bytes", header->payload_compressed, size_u); rc = BZ2_bzBuffToBuffDecompress(uncompressed + header->payload_offset, &size_u, remote->buffer + header->payload_offset, header->payload_compressed, 1, 0); if (rc != BZ_OK && header->version > REMOTE_MSG_VERSION) { crm_warn("Couldn't decompress v%d message, we only understand v%d", header->version, REMOTE_MSG_VERSION); free(uncompressed); return NULL; } else if (rc != BZ_OK) { crm_err("Decompression failed: %s " CRM_XS " bzerror=%d", bz2_strerror(rc), rc); free(uncompressed); return NULL; } CRM_ASSERT(size_u == header->payload_uncompressed); memcpy(uncompressed, remote->buffer, header->payload_offset); /* Preserve the header */ remote->buffer_size = header->payload_offset + size_u; free(remote->buffer); remote->buffer = uncompressed; header = crm_remote_header(remote); } /* take ownership of the buffer */ remote->buffer_offset = 0; CRM_LOG_ASSERT(remote->buffer[sizeof(struct crm_remote_header_v0) + header->payload_uncompressed - 1] == 0); xml = string2xml(remote->buffer + header->payload_offset); if (xml == NULL && header->version > REMOTE_MSG_VERSION) { crm_warn("Couldn't parse v%d message, we only understand v%d", header->version, REMOTE_MSG_VERSION); } else if (xml == NULL) { crm_err("Couldn't parse: '%.120s'", remote->buffer + header->payload_offset); } return xml; } /*! * \internal * \brief Wait for a remote session to have data to read * * \param[in] remote Connection to check * \param[in] total_timeout Maximum time (in ms) to wait * * \return Positive value if ready to be read, 0 on timeout, -errno on error */ int crm_remote_ready(pcmk__remote_t *remote, int total_timeout) { struct pollfd fds = { 0, }; int sock = 0; int rc = 0; time_t start; int timeout = total_timeout; #ifdef HAVE_GNUTLS_GNUTLS_H if (remote->tls_session) { void *sock_ptr = gnutls_transport_get_ptr(*remote->tls_session); sock = GPOINTER_TO_INT(sock_ptr); } else if (remote->tcp_socket) { #else if (remote->tcp_socket) { #endif sock = remote->tcp_socket; } else { crm_err("Unsupported connection type"); } if (sock <= 0) { crm_trace("No longer connected"); return -ENOTCONN; } start = time(NULL); errno = 0; do { fds.fd = sock; fds.events = POLLIN; /* If we got an EINTR while polling, and we have a * specific timeout we are trying to honor, attempt * to adjust the timeout to the closest second. */ if (errno == EINTR && (timeout > 0)) { timeout = total_timeout - ((time(NULL) - start) * 1000); if (timeout < 1000) { timeout = 1000; } } rc = poll(&fds, 1, timeout); } while (rc < 0 && errno == EINTR); return (rc < 0)? -errno : rc; } /*! * \internal * \brief Read bytes off non blocking remote connection. * * \note only use with NON-Blocking sockets. Should only be used after polling socket. * This function will return once max_size is met, the socket read buffer * is empty, or an error is encountered. * * \retval number of bytes received */ static size_t crm_remote_recv_once(pcmk__remote_t *remote) { int rc = 0; size_t read_len = sizeof(struct crm_remote_header_v0); struct crm_remote_header_v0 *header = crm_remote_header(remote); if(header) { /* Stop at the end of the current message */ read_len = header->size_total; } /* automatically grow the buffer when needed */ if(remote->buffer_size < read_len) { remote->buffer_size = 2 * read_len; crm_trace("Expanding buffer to %llu bytes", (unsigned long long) remote->buffer_size); remote->buffer = realloc_safe(remote->buffer, remote->buffer_size + 1); CRM_ASSERT(remote->buffer != NULL); } #ifdef HAVE_GNUTLS_GNUTLS_H if (remote->tls_session) { rc = gnutls_record_recv(*(remote->tls_session), remote->buffer + remote->buffer_offset, remote->buffer_size - remote->buffer_offset); if (rc == GNUTLS_E_INTERRUPTED) { rc = -EINTR; } else if (rc == GNUTLS_E_AGAIN) { rc = -EAGAIN; } else if (rc < 0) { crm_debug("TLS receive failed: %s (%d)", gnutls_strerror(rc), rc); rc = -pcmk_err_generic; } } else if (remote->tcp_socket) { #else if (remote->tcp_socket) { #endif errno = 0; rc = read(remote->tcp_socket, remote->buffer + remote->buffer_offset, remote->buffer_size - remote->buffer_offset); if(rc < 0) { rc = -errno; } } else { crm_err("Unsupported connection type"); return -ESOCKTNOSUPPORT; } /* process any errors. */ if (rc > 0) { remote->buffer_offset += rc; /* always null terminate buffer, the +1 to alloc always allows for this. */ remote->buffer[remote->buffer_offset] = '\0'; crm_trace("Received %u more bytes, %llu total", rc, (unsigned long long) remote->buffer_offset); } else if (rc == -EINTR || rc == -EAGAIN) { crm_trace("non-blocking, exiting read: %s (%d)", pcmk_strerror(rc), rc); } else if (rc == 0) { crm_debug("EOF encoutered after %llu bytes", (unsigned long long) remote->buffer_offset); return -ENOTCONN; } else { crm_debug("Error receiving message after %llu bytes: %s (%d)", (unsigned long long) remote->buffer_offset, pcmk_strerror(rc), rc); return -ENOTCONN; } header = crm_remote_header(remote); if(header) { if(remote->buffer_offset < header->size_total) { crm_trace("Read less than the advertised length: %llu < %u bytes", (unsigned long long) remote->buffer_offset, header->size_total); } else { crm_trace("Read full message of %llu bytes", (unsigned long long) remote->buffer_offset); return remote->buffer_offset; } } return -EAGAIN; } /*! * \internal * \brief Read message(s) from a remote connection * * \param[in] remote Remote connection to read * \param[in] total_timeout Fail if message not read in this time (ms) * \param[out] disconnected Will be set to 1 if disconnect detected * * \return TRUE if at least one full message read, FALSE otherwise */ gboolean crm_remote_recv(pcmk__remote_t *remote, int total_timeout, int *disconnected) { int rc; time_t start = time(NULL); int remaining_timeout = 0; if (total_timeout == 0) { total_timeout = 10000; } else if (total_timeout < 0) { total_timeout = 60000; } *disconnected = 0; remaining_timeout = total_timeout; while ((remaining_timeout > 0) && !(*disconnected)) { crm_trace("Waiting for remote data (%d of %d ms timeout remaining)", remaining_timeout, total_timeout); rc = crm_remote_ready(remote, remaining_timeout); if (rc == 0) { crm_err("Timed out (%d ms) while waiting for remote data", remaining_timeout); return FALSE; } else if (rc < 0) { crm_debug("Wait for remote data aborted, will try again: %s " CRM_XS " rc=%d", pcmk_strerror(rc), rc); } else { rc = crm_remote_recv_once(remote); if (rc > 0) { return TRUE; } else if (rc == -EAGAIN) { crm_trace("Still waiting for remote data"); } else if (rc < 0) { crm_debug("Could not receive remote data: %s " CRM_XS " rc=%d", pcmk_strerror(rc), rc); } } if (rc == -ENOTCONN) { *disconnected = 1; return FALSE; } remaining_timeout = total_timeout - ((time(NULL) - start) * 1000); } return FALSE; } struct tcp_async_cb_data { gboolean success; int sock; void *userdata; void (*callback) (void *userdata, int sock); int timeout; /*ms */ time_t start; }; static gboolean check_connect_finished(gpointer userdata) { struct tcp_async_cb_data *cb_data = userdata; int cb_arg = 0; // socket fd on success, -errno on error int sock = cb_data->sock; int error = 0; fd_set rset, wset; socklen_t len = sizeof(error); struct timeval ts = { 0, }; if (cb_data->success == TRUE) { goto dispatch_done; } FD_ZERO(&rset); FD_SET(sock, &rset); wset = rset; crm_trace("fd %d: checking to see if connect finished", sock); cb_arg = select(sock + 1, &rset, &wset, NULL, &ts); if (cb_arg < 0) { cb_arg = -errno; if ((errno == EINPROGRESS) || (errno == EAGAIN)) { /* reschedule if there is still time left */ if ((time(NULL) - cb_data->start) < (cb_data->timeout / 1000)) { goto reschedule; } else { cb_arg = -ETIMEDOUT; } } crm_trace("fd %d: select failed %d connect dispatch ", sock, cb_arg); goto dispatch_done; } else if (cb_arg == 0) { if ((time(NULL) - cb_data->start) < (cb_data->timeout / 1000)) { goto reschedule; } crm_debug("fd %d: timeout during select", sock); cb_arg = -ETIMEDOUT; goto dispatch_done; } else { crm_trace("fd %d: select returned success", sock); cb_arg = 0; } /* can we read or write to the socket now? */ if (FD_ISSET(sock, &rset) || FD_ISSET(sock, &wset)) { if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &error, &len) < 0) { cb_arg = -errno; crm_trace("fd %d: call to getsockopt failed", sock); goto dispatch_done; } if (error) { crm_trace("fd %d: error returned from getsockopt: %d", sock, error); cb_arg = -error; goto dispatch_done; } } else { crm_trace("neither read nor write set after select"); cb_arg = -EAGAIN; goto dispatch_done; } dispatch_done: if (!cb_arg) { crm_trace("fd %d: connected", sock); /* Success, set the return code to the sock to report to the callback */ cb_arg = cb_data->sock; cb_data->sock = 0; } else { close(sock); } if (cb_data->callback) { cb_data->callback(cb_data->userdata, cb_arg); } free(cb_data); return FALSE; reschedule: /* will check again next interval */ return TRUE; } static int internal_tcp_connect_async(int sock, const struct sockaddr *addr, socklen_t addrlen, int timeout /* ms */ , int *timer_id, void *userdata, void (*callback) (void *userdata, int sock)) { int rc = 0; int interval = 500; int timer; struct tcp_async_cb_data *cb_data = NULL; rc = pcmk__set_nonblocking(sock); if (rc != pcmk_rc_ok) { crm_warn("Could not set socket non-blocking: %s " CRM_XS " rc=%d", pcmk_rc_str(rc), rc); close(sock); return -1; } rc = connect(sock, addr, addrlen); if (rc < 0 && (errno != EINPROGRESS) && (errno != EAGAIN)) { crm_perror(LOG_WARNING, "connect"); return -1; } cb_data = calloc(1, sizeof(struct tcp_async_cb_data)); cb_data->userdata = userdata; cb_data->callback = callback; cb_data->sock = sock; cb_data->timeout = timeout; cb_data->start = time(NULL); if (rc == 0) { /* The connect was successful immediately, we still return to mainloop * and let this callback get called later. This avoids the user of this api * to have to account for the fact the callback could be invoked within this * function before returning. */ cb_data->success = TRUE; interval = 1; } /* Check connect finished is mostly doing a non-block poll on the socket * to see if we can read/write to it. Once we can, the connect has completed. * This method allows us to connect to the server without blocking mainloop. * * This is a poor man's way of polling to see when the connection finished. * At some point we should figure out a way to use a mainloop fd callback for this. * Something about the way mainloop is currently polling prevents this from working at the * moment though. */ crm_trace("Scheduling check in %dms for whether connect to fd %d finished", interval, sock); timer = g_timeout_add(interval, check_connect_finished, cb_data); if (timer_id) { *timer_id = timer; } return 0; } static int internal_tcp_connect(int sock, const struct sockaddr *addr, socklen_t addrlen) { int rc = connect(sock, addr, addrlen); if (rc < 0) { rc = -errno; crm_warn("Could not connect socket: %s " CRM_XS " rc=%d", pcmk_strerror(rc), rc); return rc; } rc = pcmk__set_nonblocking(sock); if (rc != pcmk_rc_ok) { crm_warn("Could not set socket non-blocking: %s " CRM_XS " rc=%d", pcmk_rc_str(rc), rc); return pcmk_rc2legacy(rc); } return pcmk_ok; } /*! * \internal * \brief Connect to server at specified TCP port * * \param[in] host Name of server to connect to * \param[in] port Server port to connect to * \param[in] timeout Report error if not connected in this many milliseconds * \param[out] timer_id If non-NULL, will be set to timer ID, if asynchronous * \param[in] userdata Data to pass to callback, if asynchronous * \param[in] callback If non-NULL, connect asynchronously then call this * * \return File descriptor of connected socket on success, -ENOTCONN otherwise */ int crm_remote_tcp_connect_async(const char *host, int port, int timeout, int *timer_id, void *userdata, void (*callback) (void *userdata, int sock)) { char buffer[INET6_ADDRSTRLEN]; struct addrinfo *res = NULL; struct addrinfo *rp = NULL; struct addrinfo hints; const char *server = host; int ret_ga; int sock = -ENOTCONN; // Get host's IP address(es) memset(&hints, 0, sizeof(struct addrinfo)); hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */ hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_CANONNAME; ret_ga = getaddrinfo(server, NULL, &hints, &res); if (ret_ga) { crm_err("Unable to get IP address info for %s: %s", server, gai_strerror(ret_ga)); goto async_cleanup; } if (!res || !res->ai_addr) { crm_err("Unable to get IP address info for %s: no result", server); goto async_cleanup; } // getaddrinfo() returns a list of host's addresses, try them in order for (rp = res; rp != NULL; rp = rp->ai_next) { struct sockaddr *addr = rp->ai_addr; if (!addr) { continue; } if (rp->ai_canonname) { server = res->ai_canonname; } crm_debug("Got canonical name %s for %s", server, host); sock = socket(rp->ai_family, SOCK_STREAM, IPPROTO_TCP); if (sock == -1) { crm_perror(LOG_WARNING, "creating socket for connection to %s", server); sock = -ENOTCONN; continue; } /* Set port appropriately for address family */ /* (void*) casts avoid false-positive compiler alignment warnings */ if (addr->sa_family == AF_INET6) { ((struct sockaddr_in6 *)(void*)addr)->sin6_port = htons(port); } else { ((struct sockaddr_in *)(void*)addr)->sin_port = htons(port); } memset(buffer, 0, DIMOF(buffer)); crm_sockaddr2str(addr, buffer); crm_info("Attempting TCP connection to %s:%d", buffer, port); if (callback) { if (internal_tcp_connect_async (sock, rp->ai_addr, rp->ai_addrlen, timeout, timer_id, userdata, callback) == 0) { goto async_cleanup; /* Success for now, we'll hear back later in the callback */ } } else if (internal_tcp_connect(sock, rp->ai_addr, rp->ai_addrlen) == 0) { break; /* Success */ } close(sock); sock = -ENOTCONN; } async_cleanup: if (res) { freeaddrinfo(res); } return sock; } int crm_remote_tcp_connect(const char *host, int port) { return crm_remote_tcp_connect_async(host, port, -1, NULL, NULL, NULL); } /*! * \brief Convert an IP address (IPv4 or IPv6) to a string for logging * * \param[in] sa Socket address for IP * \param[out] s Storage for at least INET6_ADDRSTRLEN bytes * * \note sa The socket address can be a pointer to struct sockaddr_in (IPv4), * struct sockaddr_in6 (IPv6) or struct sockaddr_storage (either), * as long as its sa_family member is set correctly. */ void crm_sockaddr2str(void *sa, char *s) { switch (((struct sockaddr*)sa)->sa_family) { case AF_INET: inet_ntop(AF_INET, &(((struct sockaddr_in *)sa)->sin_addr), s, INET6_ADDRSTRLEN); break; case AF_INET6: inet_ntop(AF_INET6, &(((struct sockaddr_in6 *)sa)->sin6_addr), s, INET6_ADDRSTRLEN); break; default: strcpy(s, ""); } } int crm_remote_accept(int ssock) { int csock = 0; int rc = 0; unsigned laddr = 0; struct sockaddr_storage addr; char addr_str[INET6_ADDRSTRLEN]; #ifdef TCP_USER_TIMEOUT int optval; long sbd_timeout = crm_get_sbd_timeout(); #endif /* accept the connection */ laddr = sizeof(addr); memset(&addr, 0, sizeof(addr)); csock = accept(ssock, (struct sockaddr *)&addr, &laddr); crm_sockaddr2str(&addr, addr_str); crm_info("New remote connection from %s", addr_str); if (csock == -1) { crm_err("accept socket failed"); return -1; } rc = pcmk__set_nonblocking(csock); if (rc != pcmk_rc_ok) { crm_err("Could not set socket non-blocking: %s " CRM_XS " rc=%d", pcmk_rc_str(rc), rc); close(csock); return pcmk_rc2legacy(rc); } #ifdef TCP_USER_TIMEOUT if (sbd_timeout > 0) { optval = sbd_timeout / 2; /* time to fail and retry before watchdog */ rc = setsockopt(csock, SOL_TCP, TCP_USER_TIMEOUT, &optval, sizeof(optval)); if (rc < 0) { crm_err("setting TCP_USER_TIMEOUT (%d) on client socket failed", optval); close(csock); return rc; } } #endif return csock; } /*! * \brief Get the default remote connection TCP port on this host * * \return Remote connection TCP port number */ int crm_default_remote_port() { static int port = 0; if (port == 0) { const char *env = getenv("PCMK_remote_port"); if (env) { errno = 0; port = strtol(env, NULL, 10); if (errno || (port < 1) || (port > 65535)) { crm_warn("Environment variable PCMK_remote_port has invalid value '%s', using %d instead", env, DEFAULT_REMOTE_PORT); port = DEFAULT_REMOTE_PORT; } } else { port = DEFAULT_REMOTE_PORT; } } return port; }