+diff --git a/cgi-bin/admin.c b/cgi-bin/admin.c
+index 99b8e7b..2688eff 100644
+--- a/cgi-bin/admin.c
++++ b/cgi-bin/admin.c
+@@ -1643,7 +1643,7 @@ do_config_server(http_t *http) /* I - HTTP connection */
+ else
+ local_protocols[0] = '\0';
+
+-#ifdef HAVE_DNSSD
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ if (cgiGetVariable("BROWSE_LOCAL_DNSSD"))
+ {
+ if (local_protocols[0])
+@@ -1651,7 +1651,7 @@ do_config_server(http_t *http) /* I - HTTP connection */
+ else
+ strcat(local_protocols, "dnssd");
+ }
+-#endif /* HAVE_DNSSD */
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
+
+ #ifdef HAVE_LDAP
+ if (cgiGetVariable("BROWSE_LOCAL_LDAP"))
+@@ -2718,9 +2718,9 @@ do_menu(http_t *http) /* I - HTTP connection */
+ #endif /* HAVE_GSSAPI */
+ cgiSetVariable("KERBEROS", "");
+
+-#ifdef HAVE_DNSSD
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ cgiSetVariable("HAVE_DNSSD", "1");
+-#endif /* HAVE_DNSSD */
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
+
+ #ifdef HAVE_LDAP
+ cgiSetVariable("HAVE_LDAP", "1");
+diff --git a/scheduler/client.c b/scheduler/client.c
+index e4c9b01..984dcc5 100644
+--- a/scheduler/client.c
++++ b/scheduler/client.c
+@@ -4987,7 +4987,7 @@ valid_host(cupsd_client_t *con) /* I - Client connection */
+ !strncmp(host, "[::1]:", 6));
+ }
+
+-#ifdef HAVE_DNSSD
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ /*
+ * Check if the hostname is something.local (Bonjour); if so, allow it.
+ */
+@@ -4996,7 +4996,7 @@ valid_host(cupsd_client_t *con) /* I - Client connection */
+ (!_cups_strcasecmp(end, ".local") || !_cups_strncasecmp(end, ".local:", 7) ||
+ !_cups_strcasecmp(end, ".local.") || !_cups_strncasecmp(end, ".local.:", 8)))
+ return (1);
+-#endif /* HAVE_DNSSD */
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
+
+ /*
+ * Check if the hostname is an IP address...
+diff --git a/scheduler/conf.c b/scheduler/conf.c
+index badc630..c1edd39 100644
+--- a/scheduler/conf.c
++++ b/scheduler/conf.c
+@@ -648,7 +648,7 @@ cupsdReadConfiguration(void)
+ Browsing = CUPS_DEFAULT_BROWSING;
+ DefaultShared = CUPS_DEFAULT_DEFAULT_SHARED;
+
+-#ifdef HAVE_DNSSD
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ cupsdSetString(&DNSSDRegType, "_ipp._tcp,_cups");
+ #endif /* HAVE_DNSSD */
+
+diff --git a/scheduler/dirsvc.c b/scheduler/dirsvc.c
+index eb3c862..48dcef9 100644
+--- a/scheduler/dirsvc.c
++++ b/scheduler/dirsvc.c
+@@ -27,6 +27,7 @@
+ * ldap_connect() - Start new LDAP connection
+ * ldap_reconnect() - Reconnect to LDAP Server
+ * ldap_disconnect() - Disconnect from LDAP Server
++ * cupsdStartAvahiClient() - Start an Avahi client if needed
+ * cupsdStartBrowsing() - Start sending and receiving broadcast
+ * information.
+ * cupsdStartPolling() - Start polling servers as needed.
+@@ -45,6 +46,8 @@
+ * printer.
+ * dnssdPackTxtRecord() - Pack an array of key/value pairs into the TXT
+ * record format.
++ * avahiPackTxtRecord() - Pack an array of key/value pairs into an
++ * AvahiStringList.
+ * dnssdRegisterCallback() - DNSServiceRegister callback.
+ * dnssdRegisterPrinter() - Start sending broadcast information for a
+ * printer or update the broadcast contents.
+@@ -83,6 +86,7 @@
+ */
+
+ #include "cupsd.h"
++#include <assert.h>
+ #include <grp.h>
+
+ #ifdef HAVE_DNSSD
+@@ -97,6 +101,17 @@
+ # endif /* HAVE_SYSTEMCONFIGURATION */
+ # endif /* __APPLE__ */
+ #endif /* HAVE_DNSSD */
++#ifdef HAVE_AVAHI
++# include <avahi-common/domain.h>
++#endif /* HAVE_AVAHI */
++
++
++#ifdef HAVE_DNSSD
++typedef char *cupsd_txt_record_t;
++#endif /* HAVE_DNSSD */
++#ifdef HAVE_AVAHI
++typedef AvahiStringList *cupsd_txt_record_t;
++#endif /* HAVE_AVAHI */
+
+
+ /*
+@@ -159,27 +174,39 @@ static void update_polling(void);
+ static void update_smb(int onoff);
+
+
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
++static cupsd_txt_record_t dnssdBuildTxtRecord(int *txt_len, cupsd_printer_t *p,
++ int for_lpd);
++static int dnssdComparePrinters(cupsd_printer_t *a, cupsd_printer_t *b);
++static void dnssdDeregisterPrinter(cupsd_printer_t *p);
++static void dnssdRegisterPrinter(cupsd_printer_t *p);
++static void dnssdStop(void);
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
++
+ #ifdef HAVE_DNSSD
+ # ifdef HAVE_COREFOUNDATION
+ static void dnssdAddAlias(const void *key, const void *value,
+ void *context);
+ # endif /* HAVE_COREFOUNDATION */
+-static char *dnssdBuildTxtRecord(int *txt_len, cupsd_printer_t *p,
+- int for_lpd);
+-static int dnssdComparePrinters(cupsd_printer_t *a, cupsd_printer_t *b);
+-static void dnssdDeregisterPrinter(cupsd_printer_t *p);
+-static char *dnssdPackTxtRecord(int *txt_len, char *keyvalue[][2],
+- int count);
+ static void dnssdRegisterCallback(DNSServiceRef sdRef,
+ DNSServiceFlags flags,
+ DNSServiceErrorType errorCode,
+ const char *name, const char *regtype,
+ const char *domain, void *context);
+-static void dnssdRegisterPrinter(cupsd_printer_t *p);
+-static void dnssdStop(void);
+ static void dnssdUpdate(void);
+ #endif /* HAVE_DNSSD */
+
++#ifdef HAVE_AVAHI
++static AvahiStringList *avahiPackTxtRecord(char *keyvalue[][2],
++ int count);
++static void avahi_entry_group_cb (AvahiEntryGroup *group,
++ AvahiEntryGroupState state,
++ void *userdata);
++static void avahi_client_cb (AvahiClient *client,
++ AvahiClientState state,
++ void *userdata);
++#endif /* HAVE_AVAHI */
++
+ #ifdef HAVE_LDAP
+ static const char * const ldap_attrs[] =/* CUPS LDAP attributes */
+ {
+@@ -283,10 +310,10 @@ cupsdDeregisterPrinter(
+ ldap_dereg_printer(p);
+ #endif /* HAVE_LDAP */
+
+-#ifdef HAVE_DNSSD
+- if (removeit && (BrowseLocalProtocols & BROWSE_DNSSD) && DNSSDRef)
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
++ if (removeit && (BrowseLocalProtocols & BROWSE_DNSSD))
+ dnssdDeregisterPrinter(p);
+-#endif /* HAVE_DNSSD */
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
+ }
+
+
+@@ -702,10 +729,10 @@ cupsdRegisterPrinter(cupsd_printer_t *p)/* I - Printer */
+ slpRegisterPrinter(p); */
+ #endif /* HAVE_LIBSLP */
+
+-#ifdef HAVE_DNSSD
+- if ((BrowseLocalProtocols & BROWSE_DNSSD) && DNSSDRef)
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
++ if ((BrowseLocalProtocols & BROWSE_DNSSD))
+ dnssdRegisterPrinter(p);
+-#endif /* HAVE_DNSSD */
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
+ }
+
+
+@@ -1419,6 +1446,27 @@ ldap_disconnect(LDAP *ld) /* I - LDAP handle */
+ #endif /* HAVE_LDAP */
+
+
++#ifdef HAVE_AVAHI
++/*
++ * 'cupsdStartAvahiClient()' - Start an Avahi client if needed
++ */
++
++void
++cupsdStartAvahiClient(void)
++{
++ if (!AvahiCupsClient && !AvahiCupsClientConnecting)
++ {
++ if (!AvahiCupsPollHandle)
++ AvahiCupsPollHandle = avahi_cups_poll_new ();
++
++ if (AvahiCupsPollHandle)
++ avahi_client_new (avahi_cups_poll_get (AvahiCupsPollHandle),
++ AVAHI_CLIENT_NO_FAIL, avahi_client_cb, NULL, NULL);
++ }
++}
++#endif /* HAVE_AVAHI */
++
++
+ /*
+ * 'cupsdStartBrowsing()' - Start sending and receiving broadcast information.
+ */
+@@ -1542,13 +1590,16 @@ cupsdStartBrowsing(void)
+ else
+ BrowseSocket = -1;
+
+-#ifdef HAVE_DNSSD
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ if ((BrowseLocalProtocols | BrowseRemoteProtocols) & BROWSE_DNSSD)
+ {
++#ifdef HAVE_DNSSD
+ DNSServiceErrorType error; /* Error from service creation */
++#endif /* HAVE_DNSSD */
+ cupsd_listener_t *lis; /* Current listening socket */
+
+
++#ifdef HAVE_DNSSD
+ /*
+ * First create a "master" connection for all registrations...
+ */
+@@ -1573,6 +1624,7 @@ cupsdStartBrowsing(void)
+ fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
+
+ cupsdAddSelect(fd, (cupsd_selfunc_t)dnssdUpdate, NULL, NULL);
++#endif /* HAVE_DNSSD */
+
+ /*
+ * Then get the port we use for registrations. If we are not listening
+@@ -1606,9 +1658,16 @@ cupsdStartBrowsing(void)
+ */
+
+ cupsdUpdateDNSSDName();
++
++#ifdef HAVE_AVAHI
++ cupsdStartAvahiClient ();
++#endif /* HAVE_AVAHI */
++
++#ifdef HAVE_DNSSD
+ }
+- }
+ #endif /* HAVE_DNSSD */
++ }
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
+
+ #ifdef HAVE_LIBSLP
+ if ((BrowseLocalProtocols | BrowseRemoteProtocols) & BROWSE_SLP)
+@@ -1834,10 +1893,10 @@ cupsdStopBrowsing(void)
+ BrowseSocket = -1;
+ }
+
+-#ifdef HAVE_DNSSD
+- if ((BrowseLocalProtocols & BROWSE_DNSSD) && DNSSDRef)
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
++ if ((BrowseLocalProtocols & BROWSE_DNSSD))
+ dnssdStop();
+-#endif /* HAVE_DNSSD */
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
+
+ #ifdef HAVE_LIBSLP
+ if (((BrowseLocalProtocols | BrowseRemoteProtocols) & BROWSE_SLP) &&
+@@ -1902,7 +1961,7 @@ cupsdStopPolling(void)
+ }
+
+
+-#ifdef HAVE_DNSSD
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ /*
+ * 'cupsdUpdateDNSSDName()' - Update the computer name we use for browsing...
+ */
+@@ -1910,8 +1969,14 @@ cupsdStopPolling(void)
+ void
+ cupsdUpdateDNSSDName(void)
+ {
++#ifdef HAVE_DNSSD
+ DNSServiceErrorType error; /* Error from service creation */
+ char webif[1024]; /* Web interface share name */
++#endif /* HAVE_DNSSD */
++#ifdef HAVE_AVAHI
++ int ret; /* Error from service creation */
++ char webif[AVAHI_LABEL_MAX]; /* Web interface share name */
++#endif /* HAVE_AVAHI */
+ # ifdef HAVE_SYSTEMCONFIGURATION
+ SCDynamicStoreRef sc; /* Context for dynamic store */
+ CFDictionaryRef btmm; /* Back-to-My-Mac domains */
+@@ -2042,6 +2107,7 @@ cupsdUpdateDNSSDName(void)
+ else
+ strlcpy(webif, "CUPS Web Interface", sizeof(webif));
+
++#ifdef HAVE_DNSSD
+ if (WebIFRef)
+ DNSServiceRefDeallocate(WebIFRef);
+
+@@ -2054,9 +2120,45 @@ cupsdUpdateDNSSDName(void)
+ NULL)) != kDNSServiceErr_NoError)
+ cupsdLogMessage(CUPSD_LOG_ERROR,
+ "DNS-SD web interface registration failed: %d", error);
++#endif /* HAVE_DNSSD */
++
++#ifdef HAVE_AVAHI
++ if (!AvahiCupsClient)
++ /*
++ * Client not yet running.
++ */
++ return;
++
++ if (AvahiWebIFGroup)
++ avahi_entry_group_reset (AvahiWebIFGroup);
++ else
++ AvahiWebIFGroup = avahi_entry_group_new (AvahiCupsClient,
++ avahi_entry_group_cb,
++ NULL);
++
++ if (AvahiWebIFGroup)
++ {
++ ret = avahi_entry_group_add_service (AvahiWebIFGroup,
++ AVAHI_IF_UNSPEC,
++ AVAHI_PROTO_UNSPEC,
++ 0, /* flags */
++ webif, /* name */
++ "_http._tcp", /* type */
++ NULL, /* domain */
++ NULL, /* host */
++ DNSSDPort, /* port */
++ "path=/", NULL);
++ if (ret == 0)
++ ret = avahi_entry_group_commit (AvahiWebIFGroup);
++
++ if (ret != 0)
++ cupsdLogMessage (CUPSD_LOG_ERROR,
++ "Avahi web interface registration failed: %d", ret);
++ }
++#endif /* HAVE_AVAHI */
+ }
+ }
+-#endif /* HAVE_DNSSD */
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
+
+
+ #ifdef HAVE_LDAP
+@@ -2334,13 +2436,15 @@ dnssdAddAlias(const void *key, /* I - Key */
+ "Bad Back to My Mac domain in dynamic store!");
+ }
+ # endif /* HAVE_COREFOUNDATION */
++#endif /* HAVE_DNSSD */
+
+
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ /*
+ * 'dnssdBuildTxtRecord()' - Build a TXT record from printer info.
+ */
+
+-static char * /* O - TXT record */
++static cupsd_txt_record_t /* O - TXT record */
+ dnssdBuildTxtRecord(
+ int *txt_len, /* O - TXT record length */
+ cupsd_printer_t *p, /* I - Printer information */
+@@ -2379,7 +2483,12 @@ dnssdBuildTxtRecord(
+ keyvalue[i ][0] = "ty";
+ keyvalue[i++][1] = p->make_model ? p->make_model : "Unknown";
+
+- snprintf(admin_hostname, sizeof(admin_hostname), "%s.local.", DNSSDHostName);
++ snprintf(admin_hostname, sizeof(admin_hostname),
++ "%s.local"
++#ifdef HAVE_DNSSD
++ "." /* terminating dot no good for Avahi */
++#endif /* HAVE_DNSSD */
++ , DNSSDHostName);
+ httpAssembleURIf(HTTP_URI_CODING_ALL, adminurl_str, sizeof(adminurl_str),
+ "http", NULL, admin_hostname, DNSSDPort, "/%s/%s",
+ (p->type & CUPS_PRINTER_CLASS) ? "classes" : "printers",
+@@ -2462,7 +2571,12 @@ dnssdBuildTxtRecord(
+ * Then pack them into a proper txt record...
+ */
+
++#ifdef HAVE_DNSSD
+ return (dnssdPackTxtRecord(txt_len, keyvalue, i));
++#endif /* HAVE_DNSSD */
++#ifdef HAVE_AVAHI
++ return (avahiPackTxtRecord(keyvalue, i));
++#endif /* HAVE_AVAHI */
+ }
+
+
+@@ -2474,7 +2588,16 @@ static int /* O - Result of comparison */
+ dnssdComparePrinters(cupsd_printer_t *a,/* I - First printer */
+ cupsd_printer_t *b)/* I - Second printer */
+ {
+- return (_cups_strcasecmp(a->reg_name, b->reg_name));
++ if (!a->reg_name)
++ if (!b->reg_name)
++ return 0;
++ else
++ return -1;
++ else
++ if (!b->reg_name)
++ return 1;
++ else
++ return (_cups_strcasecmp(a->reg_name, b->reg_name));
+ }
+
+
+@@ -2489,6 +2612,10 @@ dnssdDeregisterPrinter(
+ {
+ cupsdLogMessage(CUPSD_LOG_DEBUG2, "dnssdDeregisterPrinter(%s)", p->name);
+
++#ifdef HAVE_DNSSD
++ if (!DNSSDRef)
++ return;
++
+ /*
+ * Closing the socket deregisters the service
+ */
+@@ -2524,6 +2651,24 @@ dnssdDeregisterPrinter(
+ free(p->printer_txt);
+ p->printer_txt = NULL;
+ }
++#endif /* HAVE_DNSSD */
++
++#ifdef HAVE_AVAHI
++ if (p->avahi_group)
++ {
++ avahi_entry_group_reset (p->avahi_group);
++ avahi_entry_group_free (p->avahi_group);
++ p->avahi_group = NULL;
++
++ if (p->ipp_txt)
++ avahi_string_list_free (p->ipp_txt);
++
++ if (p->printer_txt)
++ avahi_string_list_free (p->printer_txt);
++
++ p->ipp_txt = p->printer_txt = NULL;
++ }
++#endif /* HAVE_AVAHI */
+
+ /*
+ * Remove the printer from the array of DNS-SD printers, then clear the
+@@ -2533,8 +2678,10 @@ dnssdDeregisterPrinter(
+ cupsArrayRemove(DNSSDPrinters, p);
+ cupsdClearString(&p->reg_name);
+ }
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
+
+
++#ifdef HAVE_DNSSD
+ /*
+ * 'dnssdPackTxtRecord()' - Pack an array of key/value pairs into the
+ * TXT record format.
+@@ -2644,8 +2791,10 @@ dnssdRegisterCallback(
+ LastEvent |= CUPSD_EVENT_PRINTER_MODIFIED;
+ }
+ }
++#endif /* HAVE_DNSSD */
+
+
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ /*
+ * 'dnssdRegisterPrinter()' - Start sending broadcast information for a printer
+ * or update the broadcast contents.
+@@ -2654,20 +2803,40 @@ dnssdRegisterCallback(
+ static void
+ dnssdRegisterPrinter(cupsd_printer_t *p)/* I - Printer */
+ {
++#ifdef HAVE_DNSSD
+ DNSServiceErrorType se; /* dnssd errors */
+ char *ipp_txt, /* IPP TXT record buffer */
+ *printer_txt, /* LPD TXT record buffer */
+- name[1024], /* Service name */
+- *nameptr; /* Pointer into name */
++ name[1024]; /* Service name */
+ int ipp_len, /* IPP TXT record length */
+ printer_len, /* LPD TXT record length */
+ printer_port; /* LPD port number */
++#endif /* HAVE_DNSSD */
++#ifdef HAVE_AVAHI
++ int ret; /* Error code */
++ AvahiStringList *ipp_txt, /* IPP TXT record */
++ *printer_txt; /* LPD TXT record */
++ char name[AVAHI_LABEL_MAX], /* Service name */
++ fullsubtype[AVAHI_LABEL_MAX]; /* Full subtype */
++ char *regtype_copy, /* Writeable copy of reg type */
++ *subtype, /* Current service sub type */
++ *nextsubtype; /* Next service sub type */
++#endif /* HAVE_AVAHI */
++ char *nameptr; /* Pointer into name */
+ const char *regtype; /* Registration type */
+
+
++#ifdef HAVE_DNSSD
++ if (!DNSSDRef)
++ return;
++
+ cupsdLogMessage(CUPSD_LOG_DEBUG2, "dnssdRegisterPrinter(%s) %s", p->name,
+ !p->ipp_ref ? "new" : "update");
+-
++#endif /* HAVE_DNSSD */
++#ifdef HAVE_AVAHI
++ cupsdLogMessage(CUPSD_LOG_DEBUG2, "dnssdRegisterPrinter(%s) %s", p->name,
++ !p->avahi_group ? "new" : "update");
++#endif /* HAVE_AVAHI */
+ /*
+ * If per-printer sharing was just disabled make sure we're not
+ * registered before returning.
+@@ -2686,12 +2855,36 @@ dnssdRegisterPrinter(cupsd_printer_t *p)/* I - Printer */
+ if (p->info && strlen(p->info) > 0)
+ {
+ if (DNSSDComputerName)
+- snprintf(name, sizeof(name), "%s @ %s", p->info, DNSSDComputerName);
++ {
++ /*
++ * Make sure there is room for at least 15 characters of
++ * DNSSDComputerName.
++ */
++
++ assert(sizeof(name) >= 15 + 4);
++ nameptr = name + strlcpy(name, p->info,
++ sizeof(name) - 4 -
++ strnlen(DNSSDComputerName, 15));
++ nameptr += strlcpy(nameptr, " @ ", sizeof(name) - (nameptr - name));
++ strlcpy(nameptr, DNSSDComputerName, sizeof(name) - (nameptr - name));
++ }
+ else
+ strlcpy(name, p->info, sizeof(name));
+ }
+ else if (DNSSDComputerName)
+- snprintf(name, sizeof(name), "%s @ %s", p->name, DNSSDComputerName);
++ {
++ /*
++ * Make sure there is room for at least 15 characters of
++ * DNSSDComputerName.
++ */
++
++ assert(sizeof(name) >= 15 + 4);
++ nameptr = name + strlcpy(name, p->info,
++ sizeof(name) - 4 -
++ strnlen(DNSSDComputerName, 15));
++ nameptr += strlcpy(nameptr, " @ ", sizeof(name) - (nameptr - name));
++ strlcpy(nameptr, DNSSDComputerName, sizeof(name) - (nameptr - name));
++ }
+ else
+ strlcpy(name, p->name, sizeof(name));
+
+@@ -2712,6 +2905,7 @@ dnssdRegisterPrinter(cupsd_printer_t *p)/* I - Printer */
+ * Register IPP and (optionally) LPD...
+ */
+
++#ifdef HAVE_DNSSD
+ ipp_len = 0; /* anti-compiler-warning-code */
+ ipp_txt = dnssdBuildTxtRecord(&ipp_len, p, 0);
+
+@@ -2884,6 +3078,209 @@ dnssdRegisterPrinter(cupsd_printer_t *p)/* I - Printer */
+
+ if (printer_txt)
+ free(printer_txt);
++#endif /* HAVE_DNSSD */
++#ifdef HAVE_AVAHI
++ if (!AvahiCupsClient)
++ /*
++ * Client not running yet. The client callback will call us again later.
++ */
++ return;
++
++ ipp_txt = dnssdBuildTxtRecord(NULL, p, 0);
++ printer_txt = dnssdBuildTxtRecord(NULL, p, 1);
++ regtype = (p->type & CUPS_PRINTER_FAX) ? "_fax-ipp._tcp" : DNSSDRegType;
++
++ if (p->avahi_group && p->ipp_txt && ipp_txt &&
++ !avahi_string_list_equal (p->ipp_txt, ipp_txt))
++ {
++ /*
++ * Update the existing registration...
++ */
++
++ avahi_string_list_free (p->ipp_txt);
++
++ if (p->printer_txt)
++ avahi_string_list_free (p->printer_txt);
++
++ /*
++ * Update the service group entry.
++ */
++
++ regtype_copy = strdup (regtype);
++ subtype = strchr (regtype_copy, ',');
++ if (subtype)
++ *subtype = '\0';
++
++ cupsdLogMessage (CUPSD_LOG_DEBUG,
++ "Updating TXT record for %s (%s)", name, regtype_copy);
++ ret = avahi_entry_group_update_service_txt_strlst (p->avahi_group,
++ AVAHI_IF_UNSPEC,
++ AVAHI_PROTO_UNSPEC,
++ 0, name,
++ regtype_copy,
++ NULL, ipp_txt);
++ free (regtype_copy);
++
++ if (ret < 0)
++ goto update_failed;
++
++ p->ipp_txt = ipp_txt;
++ ipp_txt = NULL;
++
++ if (BrowseLocalProtocols & BROWSE_LPD)
++ {
++ ret = avahi_entry_group_update_service_txt_strlst (p->avahi_group,
++ AVAHI_IF_UNSPEC,
++ AVAHI_PROTO_UNSPEC,
++ 0, name,
++ "_printer._tcp", NULL,
++ printer_txt);
++ if (ret < 0)
++ goto update_failed;
++
++ p->printer_txt = printer_txt;
++ printer_txt = NULL;
++ }
++
++ ret = avahi_entry_group_commit (p->avahi_group);
++ if (ret < 0)
++ {
++ update_failed:
++ cupsdLogMessage (CUPSD_LOG_ERROR,
++ "Failed to update TXT record for %s: %d",
++ name, ret);
++ avahi_entry_group_reset (p->avahi_group);
++ avahi_entry_group_free (p->avahi_group);
++ p->avahi_group = NULL;
++ ipp_txt = p->ipp_txt;
++ p->ipp_txt = NULL;
++ }
++ }
++
++ if (!p->avahi_group)
++ {
++ /*
++ * Initial registration. Use the _fax subtype for fax queues...
++ */
++
++ p->avahi_group = avahi_entry_group_new (AvahiCupsClient,
++ avahi_entry_group_cb,
++ p);
++
++ cupsdLogMessage(CUPSD_LOG_DEBUG,
++ "Registering Avahi printer %s with name \"%s\" and "
++ "type \"%s\"", p->name, name, regtype);
++
++ if (!p->avahi_group)
++ {
++ ret = 0;
++ goto add_failed;
++ }
++
++ /*
++ * Add each service type (DNSSDRegType may contain several,
++ * separated by commas).
++ */
++
++ subtype = regtype_copy = strdup (regtype);
++ while (subtype && *subtype)
++ {
++ nextsubtype = strchr (subtype, ',');
++ if (nextsubtype)
++ *nextsubtype++ = '\0';
++
++ if (subtype == regtype_copy)
++ {
++ /*
++ * Main type entry.
++ */
++
++ cupsdLogMessage (CUPSD_LOG_DEBUG,
++ "Adding TXT record for %s (%s)", name, regtype_copy);
++ ret = avahi_entry_group_add_service_strlst (p->avahi_group,
++ AVAHI_IF_UNSPEC,
++ AVAHI_PROTO_UNSPEC,
++ 0, name, regtype_copy,
++ NULL, NULL,
++ DNSSDPort,
++ ipp_txt);
++ }
++ else
++ {
++ /*
++ * Sub-type entry.
++ */
++
++ snprintf (fullsubtype, sizeof(fullsubtype),
++ "%s._sub.%s", subtype, regtype_copy);
++ cupsdLogMessage (CUPSD_LOG_DEBUG,
++ "Adding TXT record for %s (%s)", name, fullsubtype);
++ ret = avahi_entry_group_add_service_subtype (p->avahi_group,
++ AVAHI_IF_UNSPEC,
++ AVAHI_PROTO_UNSPEC,
++ 0, name,
++ regtype_copy,
++ NULL, fullsubtype);
++ }
++
++ if (ret < 0)
++ {
++ free (regtype_copy);
++ goto add_failed;
++ }
++
++ subtype = nextsubtype;
++ }
++
++ free (regtype_copy);
++ p->ipp_txt = ipp_txt;
++ ipp_txt = NULL;
++
++ if (BrowseLocalProtocols & BROWSE_LPD)
++ {
++ cupsdLogMessage(CUPSD_LOG_DEBUG,
++ "Registering Avahi printer %s with name \"%s\" and "
++ "type \"_printer._tcp\"", p->name, name);
++
++ ret = avahi_entry_group_add_service_strlst (p->avahi_group,
++ AVAHI_IF_UNSPEC,
++ AVAHI_PROTO_UNSPEC,
++ 0, name,
++ "_printer._tcp", NULL, NULL,
++ 515,
++ printer_txt);
++ if (ret < 0)
++ goto add_failed;
++
++ p->printer_txt = printer_txt;
++ printer_txt = NULL;
++ }
++
++ ret = avahi_entry_group_commit (p->avahi_group);
++
++ if (ret < 0)
++ {
++ add_failed:
++ cupsdLogMessage (CUPSD_LOG_ERROR,
++ "Failed to add Avahi entry for %s: %d",
++ name, ret);
++ if (p->avahi_group)
++ {
++ avahi_entry_group_reset (p->avahi_group);
++ avahi_entry_group_free (p->avahi_group);
++ p->avahi_group = NULL;
++ }
++ ipp_txt = p->ipp_txt;
++ p->ipp_txt = NULL;
++ }
++ }
++
++ if (ipp_txt)
++ avahi_string_list_free (ipp_txt);
++
++ if (printer_txt)
++ avahi_string_list_free (printer_txt);
++#endif /* HAVE_AVAHI */
+ }
+
+
+@@ -2896,6 +3293,10 @@ dnssdStop(void)
+ {
+ cupsd_printer_t *p; /* Current printer */
+
++#ifdef HAVE_DNSSD
++ if (!DNSSDRef)
++ return;
++#endif /* HAVE_DNSSD */
+
+ /*
+ * De-register the individual printers
+@@ -2906,6 +3307,7 @@ dnssdStop(void)
+ p = (cupsd_printer_t *)cupsArrayNext(Printers))
+ dnssdDeregisterPrinter(p);
+
++#ifdef HAVE_DNSSD
+ /*
+ * Shutdown the rest of the service refs...
+ */
+@@ -2926,14 +3328,17 @@ dnssdStop(void)
+
+ DNSServiceRefDeallocate(DNSSDRef);
+ DNSSDRef = NULL;
++#endif /* HAVE_DNSSD */
+
+ cupsArrayDelete(DNSSDPrinters);
+ DNSSDPrinters = NULL;
+
+ DNSSDPort = 0;
+ }
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
+
+
++#ifdef HAVE_DNSSD
+ /*
+ * 'dnssdUpdate()' - Handle DNS-SD queries.
+ */
+@@ -2955,6 +3360,147 @@ dnssdUpdate(void)
+ #endif /* HAVE_DNSSD */
+
+
++#ifdef HAVE_AVAHI
++/*
++ * 'avahiPackTxtRecord()' - Pack an array of key/value pairs into an
++ * AvahiStringList.
++ */
++
++static AvahiStringList * /* O - new string list */
++avahiPackTxtRecord(char *keyvalue[][2], /* I - Table of key value pairs */
++ int count) /* I - Number of items in table */
++{
++ AvahiStringList *strlst = NULL;
++ char **elements;
++ size_t len;
++ int i = 0;
++
++ elements = malloc ((1 + count) * sizeof (char *));
++ if (!elements)
++ goto cleanup;
++
++ for (i = 0; i < count; i++)
++ {
++ len = (1 + strlen (keyvalue[i][0]) +
++ (keyvalue[i][1] ? 1 + strlen (keyvalue[i][1]) : 1));
++ elements[i] = malloc (len * sizeof (char));
++ if (!elements[i])
++ goto cleanup;
++
++ snprintf (elements[i], len, "%s=%s", keyvalue[i][0], keyvalue[i][1]);
++ }
++
++ strlst = avahi_string_list_new_from_array ((const char **) elements, count);
++
++cleanup:
++ while (--i >= 0)
++ free (elements[i]);
++
++ free (elements);
++ return (strlst);
++}
++
++
++/*
++ * 'avahi_entry_group_cb()' - Avahi entry group callback function.
++ */
++static void
++avahi_entry_group_cb (AvahiEntryGroup *group,
++ AvahiEntryGroupState state,
++ void *userdata)
++{
++ char *name;
++
++ if (userdata)
++ name = ((cupsd_printer_t *) userdata)->reg_name;
++ else
++ name = "CUPS web interface";
++
++ switch (state)
++ {
++ case AVAHI_ENTRY_GROUP_UNCOMMITED:
++ case AVAHI_ENTRY_GROUP_REGISTERING:
++ break;
++
++ case AVAHI_ENTRY_GROUP_ESTABLISHED:
++ cupsdLogMessage (CUPSD_LOG_DEBUG,
++ "Avahi entry group established for %s", name);
++ break;
++
++ default:
++ cupsdLogMessage (CUPSD_LOG_DEBUG,
++ "Avahi entry group %s has state %d",
++ name, state);
++ break;
++ }
++}
++
++
++/*
++ * 'avahi_client_cb()' - Avahi client callback function.
++ */
++static void
++avahi_client_cb (AvahiClient *client,
++ AvahiClientState state,
++ void *userdata)
++{
++ cupsd_printer_t *printer;
++ switch (state)
++ {
++ case AVAHI_CLIENT_S_RUNNING:
++ /*
++ * Avahi client started successfully.
++ */
++ AvahiCupsClient = client;
++ AvahiCupsClientConnecting = 0;
++ cupsdLogMessage (CUPSD_LOG_DEBUG, "Avahi client started");
++
++ cupsdUpdateDNSSDName ();
++
++ for (printer = (cupsd_printer_t *)cupsArrayFirst(Printers);
++ printer;
++ printer = (cupsd_printer_t *)cupsArrayNext(Printers))
++ if (Browsing && (BrowseLocalProtocols & BROWSE_DNSSD) &&
++ (!(printer->type & (CUPS_PRINTER_REMOTE | CUPS_PRINTER_IMPLICIT |
++ CUPS_PRINTER_SCANNER))) && printer->shared)
++ dnssdRegisterPrinter (printer);
++
++ break;
++
++ case AVAHI_CLIENT_CONNECTING:
++ /*
++ * No Avahi daemon, client is waiting.
++ */
++ AvahiCupsClientConnecting = 1;
++ cupsdLogMessage (CUPSD_LOG_DEBUG, "Avahi client connecting");
++ break;
++
++ case AVAHI_CLIENT_FAILURE:
++ /*
++ * Avahi client failed, close it to allow a clean restart.
++ */
++ cupsdLogMessage (CUPSD_LOG_ERROR,
++ "Avahi client failed, "
++ "closing client to allow a clean restart");
++
++ for (printer = (cupsd_printer_t *)cupsArrayFirst(Printers);
++ printer;
++ printer = (cupsd_printer_t *)cupsArrayNext(Printers))
++ dnssdDeregisterPrinter (printer);
++
++ avahi_client_free(client);
++ AvahiCupsClientConnecting = 0;
++ AvahiCupsClient = NULL;
++
++ break;
++
++ default:
++ cupsdLogMessage (CUPSD_LOG_DEBUG, "Avahi client state: %d", state);
++ }
++}
++#endif /* HAVE_AVAHI */
++
++
+ /*
+ * 'get_auth_info_required()' - Get the auth-info-required value to advertise.
+ */
+diff --git a/scheduler/dirsvc.h b/scheduler/dirsvc.h
+index 99079bd..d53a179 100644
+--- a/scheduler/dirsvc.h
++++ b/scheduler/dirsvc.h
+@@ -31,6 +31,10 @@
+ # endif /* HAVE_LDAP_SSL_H */
+ #endif /* HAVE_LDAP */
+
++#ifdef HAVE_AVAHI
++# include <avahi-client/publish.h>
++#endif /* HAVE_AVAHI */
++
+ /*
+ * Browse protocols...
+ */
+@@ -131,19 +135,22 @@ VAR int PollPipe VALUE(0);
+ VAR cupsd_statbuf_t *PollStatusBuffer VALUE(NULL);
+ /* Status buffer for pollers */
+
+-#ifdef HAVE_DNSSD
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ VAR char *DNSSDComputerName VALUE(NULL),
+ /* Computer/server name */
+ *DNSSDHostName VALUE(NULL),
+ /* Hostname */
+ *DNSSDRegType VALUE(NULL);
+ /* Bonjour registration type */
+-VAR cups_array_t *DNSSDAlias VALUE(NULL);
+- /* List of dynamic ServerAlias's */
+ VAR int DNSSDPort VALUE(0);
+ /* Port number to register */
+ VAR cups_array_t *DNSSDPrinters VALUE(NULL);
+ /* Printers we have registered */
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
++
++#ifdef HAVE_DNSSD
++VAR cups_array_t *DNSSDAlias VALUE(NULL);
++ /* List of dynamic ServerAlias's */
+ VAR DNSServiceRef DNSSDRef VALUE(NULL),
+ /* Master DNS-SD service reference */
+ WebIFRef VALUE(NULL),
+@@ -152,6 +159,17 @@ VAR DNSServiceRef DNSSDRef VALUE(NULL),
+ /* Remote printer browse reference */
+ #endif /* HAVE_DNSSD */
+
++#ifdef HAVE_AVAHI
++VAR AvahiCupsPoll *AvahiCupsPollHandle VALUE(NULL);
++ /* AvahiCupsPoll object */
++VAR AvahiClient *AvahiCupsClient VALUE(NULL);
++ /* AvahiClient object */
++VAR int AvahiCupsClientConnecting VALUE(0);
++ /* Is AvahiClient object connecting? */
++VAR AvahiEntryGroup *AvahiWebIFGroup VALUE(NULL);
++ /* Web interface entry group */
++#endif /* HAVE_AVAHI */
++
+ #ifdef HAVE_LIBSLP
+ VAR SLPHandle BrowseSLPHandle VALUE(NULL);
+ /* SLP API handle */
+@@ -195,13 +213,14 @@ extern void cupsdRegisterPrinter(cupsd_printer_t *p);
+ extern void cupsdRestartPolling(void);
+ extern void cupsdSaveRemoteCache(void);
+ extern void cupsdSendBrowseList(void);
++extern void cupsdStartAvahiClient(void);
+ extern void cupsdStartBrowsing(void);
+ extern void cupsdStartPolling(void);
+ extern void cupsdStopBrowsing(void);
+ extern void cupsdStopPolling(void);
+-#ifdef HAVE_DNSSD
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ extern void cupsdUpdateDNSSDName(void);
+-#endif /* HAVE_DNSSD */
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
+ #ifdef HAVE_LDAP
+ extern void cupsdUpdateLDAPBrowse(void);
+ #endif /* HAVE_LDAP */
+diff --git a/scheduler/ipp.c b/scheduler/ipp.c
+index a048baa..9a3ab11 100644
+--- a/scheduler/ipp.c
++++ b/scheduler/ipp.c
+@@ -6087,7 +6087,7 @@ copy_printer_attrs(
+ ippAddDate(con->response, IPP_TAG_PRINTER, "printer-current-time",
+ ippTimeToDate(curtime));
+
+-#ifdef HAVE_DNSSD
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ if (!ra || cupsArrayFind(ra, "printer-dns-sd-name"))
+ {
+ if (printer->reg_name)
+@@ -6097,7 +6097,7 @@ copy_printer_attrs(
+ ippAddInteger(con->response, IPP_TAG_PRINTER, IPP_TAG_NOVALUE,
+ "printer-dns-sd-name", 0);
+ }
+-#endif /* HAVE_DNSSD */
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
+
+ if (!ra || cupsArrayFind(ra, "printer-error-policy"))
+ ippAddString(con->response, IPP_TAG_PRINTER, IPP_TAG_NAME,
+diff --git a/scheduler/main.c b/scheduler/main.c
+index 1e60572..6c210e6 100644
+--- a/scheduler/main.c
++++ b/scheduler/main.c
+@@ -120,6 +120,10 @@ main(int argc, /* I - Number of command-line args */
+ cupsd_listener_t *lis; /* Current listener */
+ time_t current_time, /* Current time */
+ activity, /* Client activity timer */
++#ifdef HAVE_AVAHI
++ avahi_client_time, /* Time for next Avahi client
++ check */
++#endif /* HAVE_AVAHI */
+ browse_time, /* Next browse send time */
+ senddoc_time, /* Send-Document time */
+ expire_time, /* Subscription expire time */
+@@ -662,6 +666,9 @@ main(int argc, /* I - Number of command-line args */
+ */
+
+ current_time = time(NULL);
++#ifdef HAVE_AVAHI
++ avahi_client_time = current_time;
++#endif /* HAVE_AVAHI */
+ browse_time = current_time;
+ event_time = current_time;
+ expire_time = current_time;
+@@ -884,6 +891,16 @@ main(int argc, /* I - Number of command-line args */
+ tmo = cupsdNextTimeout (&tmo_delay);
+ if (tmo && tmo_delay == 0)
+ cupsdRunTimeout (tmo);
++
++ /*
++ * Try to restart the Avahi client every 10 seconds if needed...
++ */
++
++ if ((current_time - avahi_client_time) >= 10)
++ {
++ avahi_client_time = current_time;
++ cupsdStartAvahiClient();
++ }
+ #endif /* HAVE_AVAHI */
+
+ #ifndef __APPLE__
+diff --git a/scheduler/printers.c b/scheduler/printers.c
+index 4686c4c..fac7bbc 100644
+--- a/scheduler/printers.c
++++ b/scheduler/printers.c
+@@ -883,9 +883,9 @@ cupsdDeletePrinter(
+ cupsdClearString(&p->alert);
+ cupsdClearString(&p->alert_description);
+
+-#ifdef HAVE_DNSSD
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ cupsdClearString(&p->pdl);
+-#endif /* HAVE_DNSSD */
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
+
+ cupsArrayDelete(p->filetypes);
+
+@@ -3765,7 +3765,7 @@ add_printer_formats(cupsd_printer_t *p) /* I - Printer */
+ attr->values[i].string.text = _cupsStrAlloc(mimetype);
+ }
+
+-#ifdef HAVE_DNSSD
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ {
+ char pdl[1024]; /* Buffer to build pdl list */
+ mime_filter_t *filter; /* MIME filter looping var */
+@@ -3821,7 +3821,7 @@ add_printer_formats(cupsd_printer_t *p) /* I - Printer */
+
+ cupsdSetString(&p->pdl, pdl);
+ }
+-#endif /* HAVE_DNSSD */
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
+ }
+
+
+diff --git a/scheduler/printers.h b/scheduler/printers.h
+index 1751578..fb04651 100644
+--- a/scheduler/printers.h
++++ b/scheduler/printers.h
+@@ -16,6 +16,9 @@
+ #ifdef HAVE_DNSSD
+ # include <dns_sd.h>
+ #endif /* HAVE_DNSSD */
++#ifdef HAVE_AVAHI
++# include "avahi.h"
++#endif /* HAVE_AVAHI */
+ #include <cups/pwg-private.h>
+
+
+@@ -95,16 +98,23 @@ struct cupsd_printer_s
+ time_t marker_time; /* Last time marker attributes were updated */
+ _ppd_cache_t *pc; /* PPD cache and mapping data */
+
+-#ifdef HAVE_DNSSD
++#if defined(HAVE_DNSSD) || defined(HAVE_AVAHI)
+ char *reg_name, /* Name used for service registration */
+- *pdl, /* pdl value for TXT record */
+- *ipp_txt, /* IPP TXT record contents */
++ *pdl; /* pdl value for TXT record */
++#endif /* defined(HAVE_DNSSD) || defined(HAVE_AVAHI) */
++#ifdef HAVE_DNSSD
++ char *ipp_txt, /* IPP TXT record contents */
+ *printer_txt; /* LPD TXT record contents */
+ int ipp_len, /* IPP TXT record length */
+ printer_len; /* LPD TXT record length */
+ DNSServiceRef ipp_ref, /* Reference for _ipp._tcp,_cups */
+ printer_ref; /* Reference for _printer._tcp */
+ #endif /* HAVE_DNSSD */
++#ifdef HAVE_AVAHI
++ AvahiStringList *ipp_txt, /* IPP TXT record */
++ *printer_txt; /* LPD TXT record */
++ AvahiEntryGroup *avahi_group; /* Avahi entry group */
++#endif /* HAVE_AVAHI */
+ };
+
+