/** * Sets the logging identifier based on a remote-host identifier and an optional * suffix. * * @param remote Pointer to identifier of remote host. May be a hostname or * a dotted-quad IP address. Client may free upon return. * @param suffix Pointer to suffix to be added to ulog(3) identifier (e.g., * "(feed)") or NULL. */ void set_abbr_ident( const char* const remote, const char* const suffix) { (void)pthread_once(&once_control, regex_init); bool isFeeder = suffix ? regexec(®ex, suffix, 0, NULL, 0) == 0 : false; (void)log_set_upstream_id(remote, isFeeder); }
/** * Feeds or notifies a downstream LDM. This function returns either NULL or a * reply to be sent to the downstream LDM (e.g., a RECLASS message) or * terminates this process (hopefully after sending some data). * * @param xprt [in/out] Pointer to server-side transport handle. * @param want [in] Pointer to subscription by downstream LDM. * May contain a "signature" product-specification. * @param isNotifier [in] Whether or not the upstream LDM is a feeder or a * notifier. * @param maxHereis Maximum HEREIS size parameter. Ignored if "isNotifier" * is true. * @return The reply for the downstream LDM or NULL if no reply * should be made. */ static fornme_reply_t* feed_or_notify( SVCXPRT* const xprt, const prod_class_t* const want, const int isNotifier, const max_hereis_t maxHereis) { struct sockaddr_in downAddr = *svc_getcaller(xprt); ErrorObj* errObj; int status; char* downName = NULL; prod_class_t* origSub = NULL; prod_class_t* allowSub = NULL; const signaturet* signature = NULL; UpFilter* upFilter = NULL; fornme_reply_t* reply = NULL; int isPrimary; static fornme_reply_t theReply; static prod_class_t* uldbSub = NULL; /* * Clean-up from a (possibly) previous invocation */ (void)memset(&theReply, 0, sizeof(theReply)); if (uldbSub != NULL) { free_prod_class(uldbSub); uldbSub = NULL; } downName = strdup(hostbyaddr(&downAddr)); if (NULL == downName) { log_error_q("Couldn't duplicate downstream host name: \"%s\"", hostbyaddr(&downAddr)); svcerr_systemerr(xprt); goto return_or_exit; } log_set_upstream_id(downName, !isNotifier); /* * Remove any "signature" specification from the subscription. */ if ((errObj = separateProductClass(want, &origSub, &signature)) != NULL) { err_log_and_free(errObj, ERR_FAILURE); svcerr_systemerr(xprt); goto free_down_name; } /* * Get the upstream filter */ errObj = lcf_getUpstreamFilter(downName, &downAddr.sin_addr, origSub, &upFilter); if (errObj) { err_log_and_free(ERR_NEW(0, errObj, "Couldn't get \"upstream\" filter"), ERR_FAILURE); svcerr_systemerr(xprt); goto free_orig_sub; } if (NULL == upFilter) { err_log_and_free(ERR_NEW1(0, NULL, "Upstream filter prevents data-transfer: %s", s_prod_class(NULL, 0, origSub)), ERR_FAILURE); svcerr_weakauth(xprt); goto free_orig_sub; } /* TODO: adjust time? */ /* * Reduce the subscription according to what the downstream host is allowed * to receive. */ status = lcf_reduceToAllowed(downName, &downAddr.sin_addr, origSub, &allowSub); if (status == ENOMEM) { log_syserr_q("Couldn't compute wanted/allowed product intersection"); svcerr_systemerr(xprt); goto free_up_filter; } if (status == EINVAL) { log_warning_q("Invalid pattern in product-class: %s", s_prod_class(NULL, 0, origSub)); theReply.code = BADPATTERN; reply = &theReply; goto free_up_filter; } assert(status == 0); (void) logIfReduced(origSub, allowSub, "ALLOW entries"); /* * Reduce the subscription according to existing subscriptions from the * same downstream host and, if `isAntiDosEnabled()` returns `true`, * terminate every previously-existing upstream LDM process that's feeding * (not notifying) a subset of the subscription to the same IP address. * * The following relies on atexit()-registered cleanup for removal of the * entry from the upstream LDM database. */ isPrimary = maxHereis > UINT_MAX / 2; status = uldb_addProcess(getpid(), 6, &downAddr, allowSub, &uldbSub, isNotifier, isPrimary); if (status) { log_error_q("Couldn't add this process to the upstream LDM database"); svcerr_systemerr(xprt); goto free_allow_sub; } (void) logIfReduced(allowSub, uldbSub, "existing subscriptions"); /* * Send a RECLASS reply to the downstream LDM if appropriate. */ if (!clss_eq(origSub, uldbSub)) { theReply.code = RECLASS; if (0 < uldbSub->psa.psa_len) { /* * The downstream LDM is allowed less than it requested and was * entered into the upstream LDM database. */ (void)uldb_remove(getpid()); /* maybe next time */ theReply.fornme_reply_t_u.prod_class = uldbSub; } else { /* * The downstream LDM isn't allowed anything and wasn't entered * into the upstream LDM database. */ static prod_class noSub = { { 0, 0 }, /* TS_ZERO */ { 0, 0 }, /* TS_ZERO */ { 0, (prod_spec *) NULL } }; theReply.fornme_reply_t_u.prod_class = &noSub; } reply = &theReply; goto free_allow_sub; } /* * Reply to the downstream LDM that the subscription will be honored. */ theReply.code = OK; theReply.fornme_reply_t_u.id = (unsigned) getpid(); if (!svc_sendreply(xprt, (xdrproc_t)xdr_fornme_reply_t, (caddr_t)&theReply)) { log_error_q("svc_sendreply(...) failure"); svcerr_systemerr(xprt); goto free_allow_sub; } /* * Wait a second before sending anything to the downstream LDM. */ (void) sleep(1); status = isNotifier ? up6_new_notifier(xprt->xp_sock, downName, &downAddr, uldbSub, signature, getQueuePath(), interval, upFilter) : up6_new_feeder(xprt->xp_sock, downName, &downAddr, uldbSub, signature, getQueuePath(), interval, upFilter, isPrimary); svc_destroy(xprt); /* closes the socket */ exit(status); /* * Reply and error handling: */ free_allow_sub: free_prod_class(allowSub); free_up_filter: upFilter_free(upFilter); free_orig_sub: free_prod_class(origSub); free_down_name: free(downName); return_or_exit: return reply; }