--- /dev/null
+/*
+ * Author: Lee Essen <lee.essen@nowonline.co.uk>
+ * Based on: avahi support from Daniel S. Haischt <me@daniel.stefan.haischt.name>
+ * Purpose: mdns based Zeroconf support
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#ifdef HAVE_MDNS
+
+#include <unistd.h>
+#include <time.h>
+#include <pthread.h>
+#include <poll.h>
+
+#include <atalk/logger.h>
+#include <atalk/util.h>
+#include <atalk/dsi.h>
+#include <atalk/unicode.h>
+#include <atalk/netatalk_conf.h>
+
+#include "afp_zeroconf.h"
+#include "afp_mdns.h"
+
+/*
+ * We'll store all the DNSServiceRef's here so that we can
+ * deallocate them later
+ */
+static DNSServiceRef *svc_refs = NULL;
+static int svc_ref_count = 0;
+static pthread_t poller;
+
+/*
+ * Its easier to use asprintf to set the TXT record values
+ */
+
+int TXTRecordPrintf(TXTRecordRef * rec, const char * key, const char * fmt, ... )
+{
+ int ret = 0;
+ char *str;
+ va_list ap;
+ va_start( ap, fmt );
+
+ if( 0 > vasprintf(&str, fmt, ap ) ) {
+ va_end(ap);
+ return -1;
+ }
+ va_end(ap);
+
+ if( kDNSServiceErr_NoError != TXTRecordSetValue(rec, key, strlen(str), str) ) {
+ ret = -1;
+ }
+
+ free(str);
+ return ret;
+}
+
+int TXTRecordKeyPrintf(TXTRecordRef * rec, const char * key_fmt, int key_var, const char * fmt, ...)
+{
+ int ret = 0;
+ char *key = NULL, *str = NULL;
+ va_list ap;
+
+ if( 0 > asprintf(&key, key_fmt, key_var))
+ return -1;
+
+ va_start( ap, fmt );
+ if( 0 > vasprintf(&str, fmt, ap )) {
+ va_end(ap);
+ ret = -1;
+ goto exit;
+ }
+ va_end(ap);
+
+ if( kDNSServiceErr_NoError != TXTRecordSetValue(rec, key, strlen(str), str) ) {
+ ret = -1;
+ goto exit;
+ }
+
+exit:
+ if (str)
+ free(str);
+ if (key)
+ free(key);
+ return ret;
+}
+
+static struct pollfd *fds;
+
+/*
+ * This is the thread that polls the filehandles
+ */
+static void *polling_thread(void *arg) {
+ // First we loop through getting the filehandles and adding them to our poll, we
+ // need to allocate our pollfd's
+ DNSServiceErrorType error;
+ fds = calloc(svc_ref_count, sizeof(struct pollfd));
+ assert(fds);
+
+ for(int i=0; i < svc_ref_count; i++) {
+ int fd = DNSServiceRefSockFD(svc_refs[i]);
+ fds[i].fd = fd;
+ fds[i].events = POLLIN;
+ }
+
+ // Now we can poll and process the results...
+ while(poll(fds, svc_ref_count, -1) > 0) {
+ for(int i=0; i < svc_ref_count; i++) {
+ if(fds[i].revents & POLLIN) {
+ error = DNSServiceProcessResult(svc_refs[i]);
+ }
+ }
+ }
+ return(NULL);
+}
+
+/*
+ * This is the callback for the service register function ... actually there isn't a lot
+ * we can do if we get problems, so we don't really need to do anything other than report
+ * the issue.
+ */
+static void RegisterReply(DNSServiceRef sdRef, DNSServiceFlags flags, DNSServiceErrorType errorCode,
+ const char *name, const char *regtype, const char *domain, void *context)
+{
+ if (errorCode != kDNSServiceErr_NoError) {
+ LOG(log_error, logtype_afpd, "Failed to register mDNS service: %s%s%s: code=%d",
+ name, regtype, domain, errorCode);
+ }
+}
+
+/*
+ * This function unregisters anything we have already
+ * registered and frees associated memory
+ */
+static void unregister_stuff() {
+ pthread_cancel(poller);
+
+ for (int i = 0; i < svc_ref_count; i++)
+ close(fds[i].fd);
+ free(fds);
+ fds = NULL;
+
+ if(svc_refs) {
+ for(int i=0; i < svc_ref_count; i++) {
+ DNSServiceRefDeallocate(svc_refs[i]);
+ }
+ free(svc_refs);
+ svc_refs = NULL;
+ svc_ref_count = 0;
+ }
+}
+
+/*
+ * This function tries to register the AFP DNS
+ * SRV service type.
+ */
+static void register_stuff(const AFPObj *obj) {
+ uint port;
+ const struct vol *volume;
+ DSI *dsi;
+ char name[MAXINSTANCENAMELEN+1];
+ DNSServiceErrorType error;
+ TXTRecordRef txt_adisk;
+ TXTRecordRef txt_devinfo;
+ char tmpname[256];
+
+ // If we had already registered, then we will unregister and re-register
+ if(svc_refs) unregister_stuff();
+
+ /* Register our service, prepare the TXT record */
+ TXTRecordCreate(&txt_adisk, 0, NULL);
+ if( 0 > TXTRecordPrintf(&txt_adisk, "sys", "waMa=0,adVF=0x100") ) {
+ LOG ( log_error, logtype_afpd, "Could not create Zeroconf TXTRecord for sys");
+ goto fail;
+ }
+
+ /* Build AFP volumes list */
+ int i = 0;
+
+ for (volume = getvolumes(); volume; volume = volume->v_next) {
+
+ if (convert_string(CH_UCS2, CH_UTF8_MAC, volume->v_u8mname, -1, tmpname, 255) <= 0) {
+ LOG ( log_error, logtype_afpd, "Could not set Zeroconf volume name for TimeMachine");
+ goto fail;
+ }
+
+ if (volume->v_flags & AFPVOL_TM) {
+ if (volume->v_uuid) {
+ LOG(log_info, logtype_afpd, "Registering volume '%s' with UUID: '%s' for TimeMachine",
+ volume->v_localname, volume->v_uuid);
+ if( 0 > TXTRecordKeyPrintf(&txt_adisk, "dk%u", i++, "adVN=%s,adVF=0xa1,adVU=%s",
+ tmpname, volume->v_uuid) ) {
+ LOG ( log_error, logtype_afpd, "Could not set Zeroconf TXTRecord for dk%u", i);
+ goto fail;
+ }
+ } else {
+ LOG(log_warning, logtype_afpd, "Registering volume '%s' for TimeMachine. But UUID is invalid.",
+ volume->v_localname);
+ if( 0 > TXTRecordKeyPrintf(&txt_adisk, "dk%u", i++, "adVN=%s,adVF=0xa1", tmpname) ) {
+ LOG ( log_error, logtype_afpd, "Could not set Zeroconf TXTRecord for dk%u", i);
+ goto fail;
+ }
+ }
+ }
+ }
+
+ /* AFP_DNS_SERVICE_TYPE */
+ svc_ref_count = 1;
+ if (i) {
+ /* ADISK_SERVICE_TYPE */
+ svc_ref_count++;
+ }
+ if (obj->options.mimicmodel) {
+ /* DEV_INFO_SERVICE_TYPE */
+ svc_ref_count++;
+ }
+
+ // Allocate the memory to store our service refs
+ svc_refs = calloc(svc_ref_count, sizeof(DNSServiceRef));
+ assert(svc_refs);
+ svc_ref_count = 0;
+
+ port = atoi(obj->options.port);
+
+ if (convert_string(obj->options.unixcharset,
+ CH_UTF8,
+ obj->options.hostname,
+ -1,
+ name,
+ MAXINSTANCENAMELEN) <= 0) {
+ LOG(log_error, logtype_afpd, "Could not set Zeroconf instance name");
+ goto fail;
+ }
+ LOG(log_info, logtype_afpd, "Registering server '%s' with Bonjour",
+ dsi->bonjourname);
+
+ error = DNSServiceRegister(&svc_refs[svc_ref_count++],
+ 0, // no flags
+ 0, // all network interfaces
+ name,
+ AFP_DNS_SERVICE_TYPE,
+ "", // default domains
+ NULL, // default host name
+ htons(port),
+ 0, // length of TXT
+ NULL, // no TXT
+ RegisterReply, // callback
+ NULL); // no context
+ if (error != kDNSServiceErr_NoError) {
+ LOG(log_error, logtype_afpd, "Failed to add service: %s, error=%d",
+ AFP_DNS_SERVICE_TYPE, error);
+ goto fail;
+ }
+
+ if (i) {
+ error = DNSServiceRegister(&svc_refs[svc_ref_count++],
+ 0, // no flags
+ 0, // all network interfaces
+ name,
+ ADISK_SERVICE_TYPE,
+ "", // default domains
+ NULL, // default host name
+ htons(port),
+ TXTRecordGetLength(&txt_adisk),
+ TXTRecordGetBytesPtr(&txt_adisk),
+ RegisterReply, // callback
+ NULL); // no context
+ if (error != kDNSServiceErr_NoError) {
+ LOG(log_error, logtype_afpd, "Failed to add service: %s, error=%d",
+ ADISK_SERVICE_TYPE, error);
+ goto fail;
+ }
+ }
+
+ if (obj->options.mimicmodel) {
+ LOG(log_info, logtype_afpd, "Registering server '%s' with model '%s'",
+ dsi->bonjourname, obj->options.mimicmodel);
+ TXTRecordCreate(&txt_devinfo, 0, NULL);
+ if ( 0 > TXTRecordPrintf(&txt_devinfo, "model", obj->options.mimicmodel) ) {
+ LOG ( log_error, logtype_afpd, "Could not create Zeroconf TXTRecord for model");
+ goto fail;
+ }
+
+ error = DNSServiceRegister(&svc_refs[svc_ref_count++],
+ 0, // no flags
+ 0, // all network interfaces
+ name,
+ DEV_INFO_SERVICE_TYPE,
+ "", // default domains
+ NULL, // default host name
+ /*
+ * We would probably use port 0 zero, but we can't, from man DNSServiceRegister:
+ * "A value of 0 for a port is passed to register placeholder services.
+ * Place holder services are not found when browsing, but other
+ * clients cannot register with the same name as the placeholder service."
+ * We therefor use port 9 which is used by the adisk service type.
+ */
+ htons(9),
+ TXTRecordGetLength(&txt_devinfo),
+ TXTRecordGetBytesPtr(&txt_devinfo),
+ RegisterReply, // callback
+ NULL); // no context
+ TXTRecordDeallocate(&txt_devinfo);
+ if (error != kDNSServiceErr_NoError) {
+ LOG(log_error, logtype_afpd, "Failed to add service: %s, error=%d",
+ DEV_INFO_SERVICE_TYPE, error);
+ goto fail;
+ }
+ } /* if (config->obj.options.mimicmodel) */
+
+ /*
+ * Now we can create the thread that will poll for the results
+ * and handle the calling of the callbacks
+ */
+ if(pthread_create(&poller, NULL, polling_thread, NULL) != 0) {
+ LOG(log_error, logtype_afpd, "Unable to start mDNS polling thread");
+ goto fail;
+ }
+
+fail:
+ TXTRecordDeallocate(&txt_adisk);
+ return;
+}
+
+/************************************************************************
+ * Public funcions
+ ************************************************************************/
+
+/*
+ * Tries to setup the Zeroconf thread and any
+ * neccessary config setting.
+ */
+void md_zeroconf_register(const AFPObj *obj) {
+ int error;
+
+ register_stuff(obj);
+ return;
+}
+
+/*
+ * Tries to shutdown this loop impl.
+ * Call this function from inside this thread.
+ */
+int md_zeroconf_unregister() {
+ unregister_stuff();
+ return 0;
+}
+
+#endif /* USE_MDNS */
+
projects / netatalk.git / blobdiff