From 9f9f4f6ea2405edc642d322c19f6f13e31920046 Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Fri, 24 Jun 2005 01:00:13 +0000 Subject: [PATCH] * update todo list * add avvahi-dnsconfd * implement AvahiDNSServerBrowser * Update special browse/register RRs to match current RFC * add support to avahi-daemon to publish name server information * add support to avahi-daemon to publish /etc/resolv.conf DNS server information * add new simple protocol command: "BROWSE-DNS-SERVERS" * cleanup final configure message git-svn-id: file:///home/lennart/svn/public/avahi/trunk@143 941a03a8-eaeb-0310-b9a0-b1bbd8fe43fe --- Makefile.am | 2 +- avahi-core/Makefile.am | 3 +- avahi-core/avahi-test.c | 22 +- avahi-core/browse-dns-server.c | 194 +++++++++++ avahi-core/browse-domain.c | 11 +- avahi-core/core.h | 44 ++- avahi-core/server.c | 104 +++++- avahi-core/server.h | 1 + avahi-daemon/Makefile.am | 2 +- avahi-daemon/avahi.conf | 2 + avahi-daemon/main.c | 162 ++++++++- avahi-daemon/simple-protocol.c | 50 ++- avahi-dnsconfd/Makefile.am | 51 +++ avahi-dnsconfd/dnsconf.action | 62 ++++ avahi-dnsconfd/main.c | 608 +++++++++++++++++++++++++++++++++ configure.ac | 29 +- todo | 4 + 17 files changed, 1305 insertions(+), 46 deletions(-) create mode 100644 avahi-core/browse-dns-server.c create mode 100644 avahi-dnsconfd/Makefile.am create mode 100755 avahi-dnsconfd/dnsconf.action create mode 100644 avahi-dnsconfd/main.c diff --git a/Makefile.am b/Makefile.am index 70757bb..f59f886 100644 --- a/Makefile.am +++ b/Makefile.am @@ -18,7 +18,7 @@ # USA. EXTRA_DIST = bootstrap.sh LICENSE -SUBDIRS = avahi-common avahi-core avahi-discover avahi-client avahi-daemon doxygen initscript +SUBDIRS = avahi-common avahi-core avahi-discover avahi-client avahi-daemon doxygen initscript avahi-dnsconfd pkgconfigdir = $(libdir)/pkgconfig pkgconfig_DATA = avahi-core.pc diff --git a/avahi-core/Makefile.am b/avahi-core/Makefile.am index 0746622..e4dd771 100644 --- a/avahi-core/Makefile.am +++ b/avahi-core/Makefile.am @@ -69,7 +69,8 @@ libavahi_core_la_SOURCES = \ dns.c dns.h \ core.h \ llist.h \ - log.c log.h + log.c log.h \ + browse-dns-server.c browse-dns-server.h libavahi_core_la_CFLAGS = $(AM_CFLAGS) libavahi_core_la_LIBADD = $(AM_LDADD) $(COMMON_LDADD) diff --git a/avahi-core/avahi-test.c b/avahi-core/avahi-test.c index 0d47941..908212c 100644 --- a/avahi-core/avahi-test.c +++ b/avahi-core/avahi-test.c @@ -102,6 +102,7 @@ static void remove_entries(void) { } static void create_entries(gboolean new_name) { + AvahiAddress a; remove_entries(); group = avahi_entry_group_new(server, entry_group_callback, NULL); @@ -128,7 +129,12 @@ static void create_entries(gboolean new_name) { avahi_log_error("Failed to add WEBDAV service"); goto fail; } - + + if (avahi_server_add_dns_server_address(server, group, 0, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, avahi_address_parse("192.168.50.1", AF_UNSPEC, &a), 53) < 0) { + avahi_log_error("Failed to add new DNS Server address"); + goto fail; + } + avahi_entry_group_commit(group); return; @@ -186,6 +192,12 @@ static void sr_callback(AvahiServiceResolver *r, gint iface, guchar protocol, Av } } +static void dsb_callback(AvahiDNSServerBrowser *b, gint iface, guchar protocol, AvahiBrowserEvent event, const gchar*hostname, const AvahiAddress *a, guint16 port, gpointer userdata) { + gchar t[64]; + avahi_address_snprint(t, sizeof(t), a); + avahi_log_debug("DSB: (%i.%i): %s/%s:%i [%s]", iface, protocol, hostname, t, port, event == AVAHI_BROWSER_NEW ? "new" : "remove"); +} + int main(int argc, char *argv[]) { GMainLoop *loop = NULL; AvahiRecordBrowser *r; @@ -198,7 +210,8 @@ int main(int argc, char *argv[]) { AvahiServiceTypeBrowser *stb; AvahiServiceBrowser *sb; AvahiServiceResolver *sr; - + AvahiDNSServerBrowser *dsb; + avahi_server_config_init(&config); /* config.host_name = g_strdup("test"); */ server = avahi_server_new(NULL, &config, server_callback, NULL); @@ -219,7 +232,9 @@ int main(int argc, char *argv[]) { sb = avahi_service_browser_new(server, -1, AF_UNSPEC, "_http._tcp", NULL, sb_callback, NULL); sr = avahi_service_resolver_new(server, -1, AF_UNSPEC, "Ecstasy HTTP", "_http._tcp", "local", AF_UNSPEC, sr_callback, NULL); - + + dsb = avahi_dns_server_browser_new(server, -1, AF_UNSPEC, "local", AVAHI_DNS_SERVER_RESOLVE, AF_UNSPEC, dsb_callback, NULL); + loop = g_main_loop_new(NULL, FALSE); g_timeout_add(1000*5, dump_timeout, server); @@ -234,6 +249,7 @@ int main(int argc, char *argv[]) { avahi_service_type_browser_free(stb); avahi_service_browser_free(sb); avahi_service_resolver_free(sr); + avahi_dns_server_browser_free(dsb); if (group) avahi_entry_group_free(group); diff --git a/avahi-core/browse-dns-server.c b/avahi-core/browse-dns-server.c new file mode 100644 index 0000000..9dd4798 --- /dev/null +++ b/avahi-core/browse-dns-server.c @@ -0,0 +1,194 @@ +/* $Id$ */ + +/*** + This file is part of avahi. + + avahi is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + avahi is distributed in the hope that it will be useful, but WITHOUT + ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General + Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with avahi; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +#ifdef HAVE_CONFIG_H +#include +#endif + +#include + +#include "browse.h" +#include "util.h" +#include "log.h" +#include "rr.h" + +typedef struct AvahiDNSServerInfo AvahiDNSServerInfo; + +struct AvahiDNSServerInfo { + AvahiDNSServerBrowser *browser; + + gint interface; + guchar protocol; + AvahiRecord *srv_record; + AvahiHostNameResolver *host_name_resolver; + AvahiAddress address; + + AVAHI_LLIST_FIELDS(AvahiDNSServerInfo, info); +}; + +struct AvahiDNSServerBrowser { + AvahiServer *server; + gchar *domain_name; + + AvahiRecordBrowser *record_browser; + AvahiDNSServerBrowserCallback callback; + gpointer userdata; + guchar aprotocol; + + guint n_info; + + AVAHI_LLIST_FIELDS(AvahiDNSServerBrowser, browser); + AVAHI_LLIST_HEAD(AvahiDNSServerInfo, info); +}; + +static AvahiDNSServerInfo* get_server_info(AvahiDNSServerBrowser *b, gint interface, guchar protocol, AvahiRecord *r) { + AvahiDNSServerInfo *i; + + g_assert(b); + g_assert(r); + + for (i = b->info; i; i = i->info_next) + if (i->interface == interface && + i->protocol == protocol && + avahi_record_equal_no_ttl(r, i->srv_record)) + return i; + + return NULL; +} + +static void server_info_free(AvahiDNSServerBrowser *b, AvahiDNSServerInfo *i) { + g_assert(b); + g_assert(i); + + avahi_record_unref(i->srv_record); + if (i->host_name_resolver) + avahi_host_name_resolver_free(i->host_name_resolver); + + AVAHI_LLIST_REMOVE(AvahiDNSServerInfo, info, b->info, i); + + g_assert(b->n_info >= 1); + b->n_info--; + + g_free(i); +} + +static void host_name_resolver_callback(AvahiHostNameResolver *r, gint interface, guchar protocol, AvahiResolverEvent event, const gchar *host_name, const AvahiAddress *a, gpointer userdata) { + AvahiDNSServerInfo *i = userdata; + + g_assert(r); + g_assert(host_name); + g_assert(i); + + if (event == AVAHI_RESOLVER_FOUND) { + i->address = *a; + + i->browser->callback(i->browser, i->interface, i->protocol, AVAHI_BROWSER_NEW, i->srv_record->data.srv.name, &i->address, i->srv_record->data.srv.port, i->browser->userdata); + } + + avahi_host_name_resolver_free(i->host_name_resolver); + i->host_name_resolver = NULL; +} + +static void record_browser_callback(AvahiRecordBrowser*rr, gint interface, guchar protocol, AvahiBrowserEvent event, AvahiRecord *record, gpointer userdata) { + AvahiDNSServerBrowser *b = userdata; + + g_assert(rr); + g_assert(record); + g_assert(b); + + g_assert(record->key->type == AVAHI_DNS_TYPE_SRV); + + if (event == AVAHI_BROWSER_NEW) { + AvahiDNSServerInfo *i; + + if (get_server_info(b, interface, protocol, record)) + return; + + if (b->n_info >= 10) + return; + + i = g_new(AvahiDNSServerInfo, 1); + i->browser = b; + i->interface = interface; + i->protocol = protocol; + i->srv_record = avahi_record_ref(record); + i->host_name_resolver = avahi_host_name_resolver_new(b->server, interface, protocol, record->data.srv.name, b->aprotocol, host_name_resolver_callback, i); + + AVAHI_LLIST_PREPEND(AvahiDNSServerInfo, info, b->info, i); + + b->n_info++; + } else if (event == AVAHI_BROWSER_REMOVE) { + AvahiDNSServerInfo *i; + + if (!(i = get_server_info(b, interface, protocol, record))) + return; + + if (!i->host_name_resolver) + b->callback(b, interface, protocol, event, i->srv_record->data.srv.name, &i->address, i->srv_record->data.srv.port, b->userdata); + + server_info_free(b, i); + } +} + +AvahiDNSServerBrowser *avahi_dns_server_browser_new(AvahiServer *server, gint interface, guchar protocol, const gchar *domain, AvahiDNSServerType type, guchar aprotocol, AvahiDNSServerBrowserCallback callback, gpointer userdata) { + AvahiDNSServerBrowser *b; + AvahiKey *k; + gchar *n = NULL; + + g_assert(server); + g_assert(callback); + g_assert(type == AVAHI_DNS_SERVER_RESOLVE || type == AVAHI_DNS_SERVER_UPDATE); + + b = g_new(AvahiDNSServerBrowser, 1); + b->server = server; + b->domain_name = avahi_normalize_name(domain ? domain : "local."); + b->callback = callback; + b->userdata = userdata; + b->aprotocol = aprotocol; + b->n_info = 0; + + AVAHI_LLIST_HEAD_INIT(AvahiDNSServerInfo, b->info); + + n = g_strdup_printf("%s.%s",type == AVAHI_DNS_SERVER_RESOLVE ? "_domain._udp" : "_dns-update._udp", b->domain_name); + k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV); + g_free(n); + + b->record_browser = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, b); + avahi_key_unref(k); + + AVAHI_LLIST_PREPEND(AvahiDNSServerBrowser, browser, server->dns_server_browsers, b); + + return b; +} + +void avahi_dns_server_browser_free(AvahiDNSServerBrowser *b) { + g_assert(b); + + while (b->info) + server_info_free(b, b->info); + + AVAHI_LLIST_REMOVE(AvahiDNSServerBrowser, browser, b->server->dns_server_browsers, b); + + avahi_record_browser_free(b->record_browser); + g_free(b->domain_name); + g_free(b); +} + diff --git a/avahi-core/browse-domain.c b/avahi-core/browse-domain.c index 61807a5..06ad64a 100644 --- a/avahi-core/browse-domain.c +++ b/avahi-core/browse-domain.c @@ -69,16 +69,19 @@ AvahiDomainBrowser *avahi_domain_browser_new(AvahiServer *server, gint interface switch (type) { case AVAHI_DOMAIN_BROWSER_BROWSE: - n = g_strdup_printf("_browse._dns-sd._udp.%s", b->domain_name); + n = g_strdup_printf("b._dns-sd._udp.%s", b->domain_name); break; case AVAHI_DOMAIN_BROWSER_BROWSE_DEFAULT: - n = g_strdup_printf("_default._browse._dns-sd._udp.%s", b->domain_name); + n = g_strdup_printf("db._dns-sd._udp.%s", b->domain_name); break; case AVAHI_DOMAIN_BROWSER_REGISTER: - n = g_strdup_printf("_register._dns-sd._udp.%s", b->domain_name); + n = g_strdup_printf("r._dns-sd._udp.%s", b->domain_name); break; case AVAHI_DOMAIN_BROWSER_REGISTER_DEFAULT: - n = g_strdup_printf("_default._register._dns-sd._udp.%s", b->domain_name); + n = g_strdup_printf("dr._dns-sd._udp.%s", b->domain_name); + break; + case AVAHI_DOMAIN_BROWSER_BROWSE_LEGACY: + n = g_strdup_printf("lb._dns-sd._udp.%s", b->domain_name); break; } diff --git a/avahi-core/core.h b/avahi-core/core.h index 0565d23..74f5cf4 100644 --- a/avahi-core/core.h +++ b/avahi-core/core.h @@ -275,6 +275,38 @@ gint avahi_server_add_service_strlst( guint16 port, AvahiStringList *strlst); +/** The type of DNS server */ +typedef enum { + AVAHI_DNS_SERVER_RESOLVE, /**< Unicast DNS servers for normal resolves (_domain._udp)*/ + AVAHI_DNS_SERVER_UPDATE /**< Unicast DNS servers for updates (_dns-update._udp)*/ +} AvahiDNSServerType; + +/** Publish the specified unicast DNS server address via mDNS. You may + * browse for records create this way wit + * avahi_dns_server_browser_new(). */ +gint avahi_server_add_dns_server_address( + AvahiServer *s, + AvahiEntryGroup *g, + gint interface, + guchar protocol, + const gchar *domain, + AvahiDNSServerType type, + const AvahiAddress *address, + guint16 port /** should be 53 */); + +/** Similar to avahi_server_add_dns_server_address(), but specify a +host name instead of an address. The specified host name should be +resolvable via mDNS */ +gint avahi_server_add_dns_server_name( + AvahiServer *s, + AvahiEntryGroup *g, + gint interface, + guchar protocol, + const gchar *domain, + AvahiDNSServerType type, + const gchar *name, + guint16 port /** should be 53 */); + typedef enum { AVAHI_BROWSER_NEW = 0, AVAHI_BROWSER_REMOVE = -1 @@ -306,7 +338,8 @@ typedef enum { AVAHI_DOMAIN_BROWSER_REGISTER, /**< Browse for a list of available registering domains */ AVAHI_DOMAIN_BROWSER_REGISTER_DEFAULT, /**< Browse for the default registering domain */ AVAHI_DOMAIN_BROWSER_BROWSE, /**< Browse for a list of available browsing domains */ - AVAHI_DOMAIN_BROWSER_BROWSE_DEFAULT /**< Browse for the default browsing domain */ + AVAHI_DOMAIN_BROWSER_BROWSE_DEFAULT, /**< Browse for the default browsing domain */ + AVAHI_DOMAIN_BROWSER_BROWSE_LEGACY /**< Legacy browse domain - see DNS-SD spec for more information */ } AvahiDomainBrowserType; typedef struct AvahiDomainBrowser AvahiDomainBrowser; @@ -329,4 +362,13 @@ typedef void (*AvahiServiceResolverCallback)(AvahiServiceResolver *r, gint inter AvahiServiceResolver *avahi_service_resolver_new(AvahiServer *server, gint interface, guchar protocol, const gchar *name, const gchar *type, const gchar *domain, guchar aprotocol, AvahiServiceResolverCallback calback, gpointer userdata); void avahi_service_resolver_free(AvahiServiceResolver *r); + +/** A domain service browser object. Use this to browse for + * conventional unicast DNS servers which may be used to resolve + * conventional domain names */ +typedef struct AvahiDNSServerBrowser AvahiDNSServerBrowser; +typedef void (*AvahiDNSServerBrowserCallback)(AvahiDNSServerBrowser *b, gint interface, guchar protocol, AvahiBrowserEvent event, const gchar *host_name, const AvahiAddress *a, guint16 port, gpointer userdata); +AvahiDNSServerBrowser *avahi_dns_server_browser_new(AvahiServer *server, gint interface, guchar protocol, const gchar *domain, AvahiDNSServerType type, guchar aprotocol, AvahiDNSServerBrowserCallback callback, gpointer userdata); +void avahi_dns_server_browser_free(AvahiDNSServerBrowser *b); + #endif diff --git a/avahi-core/server.c b/avahi-core/server.c index 356a917..0e92e27 100644 --- a/avahi-core/server.c +++ b/avahi-core/server.c @@ -1151,7 +1151,7 @@ static void register_browse_domain(AvahiServer *s) { return; s->browse_domain_entry_group = avahi_entry_group_new(s, NULL, NULL); - avahi_server_add_ptr(s, s->browse_domain_entry_group, 0, AF_UNSPEC, 0, "_browse._dns-sd._udp.local", s->domain_name); + avahi_server_add_ptr(s, s->browse_domain_entry_group, 0, AF_UNSPEC, 0, "b._dns-sd._udp.local", s->domain_name); avahi_entry_group_commit(s->browse_domain_entry_group); } @@ -1318,6 +1318,7 @@ AvahiServer *avahi_server_new(GMainContext *c, const AvahiServerConfig *sc, Avah AVAHI_LLIST_HEAD_INIT(AvahiServiceTypeBrowser, s->service_type_browsers); AVAHI_LLIST_HEAD_INIT(AvahiServiceBrowser, s->service_browsers); AVAHI_LLIST_HEAD_INIT(AvahiServiceResolver, s->service_resolvers); + AVAHI_LLIST_HEAD_INIT(AvahiDNSServerBrowser, s->dns_server_browsers); s->legacy_unicast_reflect_slots = NULL; s->legacy_unicast_reflect_id = 0; @@ -1360,7 +1361,9 @@ void avahi_server_free(AvahiServer* s) { free_group(s, s->groups); free_slots(s); - + + while (s->dns_server_browsers) + avahi_dns_server_browser_free(s->dns_server_browsers); while (s->host_name_resolvers) avahi_host_name_resolver_free(s->host_name_resolvers); while (s->address_resolvers) @@ -1767,6 +1770,103 @@ gint avahi_server_add_service( return ret; } +static void hexstring(gchar *s, size_t sl, const void *p, size_t pl) { + static const gchar hex[] = "0123456789abcdef"; + gboolean b = FALSE; + const guint8 *k = p; + + while (sl > 1 && pl > 0) { + *(s++) = hex[(b ? *k : *k >> 4) & 0xF]; + + if (b) { + k++; + pl--; + } + + b = !b; + + sl--; + } + + if (sl > 0) + *s = 0; +} + +gint avahi_server_add_dns_server_address( + AvahiServer *s, + AvahiEntryGroup *g, + gint interface, + guchar protocol, + const gchar *domain, + AvahiDNSServerType type, + const AvahiAddress *address, + guint16 port /** should be 53 */) { + + AvahiRecord *r; + gint ret; + gchar n[64] = "ip"; + + g_assert(s); + g_assert(address); + g_assert(type == AVAHI_DNS_SERVER_UPDATE || type == AVAHI_DNS_SERVER_RESOLVE); + g_assert(address->family == AF_INET || address->family == AF_INET6); + + if (address->family == AF_INET) { + hexstring(n+2, sizeof(n)-2, &address->data, 4); + r = avahi_record_new_full(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A); + r->data.a.address = address->data.ipv4; + } else { + hexstring(n+2, sizeof(n)-2, &address->data, 6); + r = avahi_record_new_full(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA); + r->data.aaaa.address = address->data.ipv6; + } + + ret = avahi_server_add(s, g, interface, protocol, AVAHI_ENTRY_UNIQUE | AVAHI_ENTRY_ALLOWMUTIPLE, r); + avahi_record_unref(r); + + ret |= avahi_server_add_dns_server_name(s, g, interface, protocol, domain, type, n, port); + + return ret; +} + +gint avahi_server_add_dns_server_name( + AvahiServer *s, + AvahiEntryGroup *g, + gint interface, + guchar protocol, + const gchar *domain, + AvahiDNSServerType type, + const gchar *name, + guint16 port /** should be 53 */) { + + gint ret = -1; + gchar t[256]; + AvahiRecord *r; + + g_assert(s); + g_assert(name); + g_assert(type == AVAHI_DNS_SERVER_UPDATE || type == AVAHI_DNS_SERVER_RESOLVE); + + if (domain) { + while (domain[0] == '.') + domain++; + } else + domain = s->domain_name; + + snprintf(t, sizeof(t), "%s.%s", type == AVAHI_DNS_SERVER_RESOLVE ? "_domain._udp" : "_dns-update._udp", domain); + + r = avahi_record_new_full(t, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV); + r->data.srv.priority = 0; + r->data.srv.weight = 0; + r->data.srv.port = port; + r->data.srv.name = avahi_normalize_name(name); + ret = avahi_server_add(s, g, interface, protocol, AVAHI_ENTRY_NULL, r); + avahi_record_unref(r); + + return ret; +} + + static void post_query_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, gpointer userdata) { AvahiKey *k = userdata; diff --git a/avahi-core/server.h b/avahi-core/server.h index 0da7c34..ad8576d 100644 --- a/avahi-core/server.h +++ b/avahi-core/server.h @@ -98,6 +98,7 @@ struct AvahiServer { AVAHI_LLIST_HEAD(AvahiServiceTypeBrowser, service_type_browsers); AVAHI_LLIST_HEAD(AvahiServiceBrowser, service_browsers); AVAHI_LLIST_HEAD(AvahiServiceResolver, service_resolvers); + AVAHI_LLIST_HEAD(AvahiDNSServerBrowser, dns_server_browsers); gboolean need_entry_cleanup, need_group_cleanup, need_browser_cleanup; diff --git a/avahi-daemon/Makefile.am b/avahi-daemon/Makefile.am index 3b90852..4c943e4 100644 --- a/avahi-daemon/Makefile.am +++ b/avahi-daemon/Makefile.am @@ -27,6 +27,7 @@ AM_CFLAGS= \ -DAVAHI_SERVICE_DIRECTORY=\"$(servicedir)\" \ -DAVAHI_CONFIG_FILE=\"$(pkgsysconfdir)/avahi.conf\" \ -DAVAHI_RUNTIME_DIR=\"$(localstatedir)/run/avahi\" + AM_LDADD=-lexpat # GLIB 2.0 @@ -37,7 +38,6 @@ AM_LDADD+=$(GLIB20_LIBS) AM_CFLAGS+=$(LIBDAEMON_CFLAGS) AM_LDADD+=$(LIBDAEMON_LIBS) - if ENABLE_DBUS # DBUS AM_CFLAGS+=$(DBUS_CFLAGS) diff --git a/avahi-daemon/avahi.conf b/avahi-daemon/avahi.conf index 900d04b..82f5326 100644 --- a/avahi-daemon/avahi.conf +++ b/avahi-daemon/avahi.conf @@ -12,6 +12,8 @@ publish-addresses=yes publish-hinfo=yes publish-workstation=yes publish-domain=yes +#publish-dns-servers=192.168.50.1,192.168.50.2 +#publish-resolv-conf-dns-servers=yes [reflector] enable-reflector=no diff --git a/avahi-daemon/main.c b/avahi-daemon/main.c index ce3400a..40e140c 100644 --- a/avahi-daemon/main.c +++ b/avahi-daemon/main.c @@ -63,19 +63,136 @@ typedef struct { gchar *config_file; gboolean enable_dbus; gboolean drop_root; + gboolean publish_resolv_conf; + gchar ** publish_dns_servers; } DaemonConfig; +#define RESOLV_CONF "/etc/resolv.conf" + +static AvahiEntryGroup *dns_servers_entry_group = NULL; +static AvahiEntryGroup *resolv_conf_entry_group = NULL; + +static gchar **resolv_conf = NULL; + +static DaemonConfig config; + +#define MAX_NAME_SERVERS 10 + +static gint load_resolv_conf(const DaemonConfig *config) { + gint ret = -1; + FILE *f; + gint i = 0; + + g_strfreev(resolv_conf); + resolv_conf = NULL; + + if (!config->publish_resolv_conf) + return 0; + + if (!(f = fopen(RESOLV_CONF, "r"))) { + avahi_log_warn("Failed to open "RESOLV_CONF"."); + goto finish; + } + + resolv_conf = g_new0(gchar*, MAX_NAME_SERVERS+1); + + while (!feof(f) && i < MAX_NAME_SERVERS) { + char ln[128]; + gchar *p; + + if (!(fgets(ln, sizeof(ln), f))) + break; + + ln[strcspn(ln, "\r\n#")] = 0; + p = ln + strspn(ln, "\t "); + + if (g_str_has_prefix(p, "nameserver")) { + p += 10; + p += strspn(p, "\t "); + p[strcspn(p, "\t ")] = 0; + resolv_conf[i++] = strdup(p); + } + } + + ret = 0; + +finish: + + if (ret != 0) { + g_strfreev(resolv_conf); + resolv_conf = NULL; + } + + if (f) + fclose(f); + + return ret; +} + +static AvahiEntryGroup* add_dns_servers(AvahiServer *s, gchar **l) { + gchar **p; + AvahiEntryGroup *g; + + g_assert(s); + g_assert(l); + + g = avahi_entry_group_new(s, NULL, NULL); + + for (p = l; *p; p++) { + AvahiAddress a; + + if (!avahi_address_parse(*p, AF_UNSPEC, &a)) + avahi_log_warn("Failed to parse address '%s', ignoring.", *p); + else + if (avahi_server_add_dns_server_address(s, g, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, &a, 53) < 0) { + avahi_entry_group_free(g); + return NULL; + } + } + + avahi_entry_group_commit(g); + + return g; + +} + +static void remove_dns_server_entry_groups(void) { + if (resolv_conf_entry_group) { + avahi_entry_group_free(resolv_conf_entry_group); + resolv_conf_entry_group = NULL; + } + + if (dns_servers_entry_group) { + avahi_entry_group_free(dns_servers_entry_group); + dns_servers_entry_group = NULL; + } +} + static void server_callback(AvahiServer *s, AvahiServerState state, gpointer userdata) { + DaemonConfig *config = userdata; + g_assert(s); + g_assert(config); if (state == AVAHI_SERVER_RUNNING) { avahi_log_info("Server startup complete. Host name is <%s>", avahi_server_get_host_name_fqdn(s)); static_service_add_to_server(); + + remove_dns_server_entry_groups(); + + if (resolv_conf && resolv_conf[0]) + resolv_conf_entry_group = add_dns_servers(s, resolv_conf); + + if (config->publish_dns_servers && config->publish_dns_servers[0]) + dns_servers_entry_group = add_dns_servers(s, config->publish_dns_servers); + } else if (state == AVAHI_SERVER_COLLISION) { gchar *n; static_service_remove_from_server(); - + + remove_dns_server_entry_groups(); + n = avahi_alternative_host_name(avahi_server_get_host_name(s)); avahi_log_warn("Host name conflict, retrying with <%s>", n); avahi_server_set_host_name(s, n); @@ -162,6 +279,7 @@ static gint load_config_file(DaemonConfig *config) { g_assert(config); f = g_key_file_new(); + g_key_file_set_list_separator(f, ','); if (!g_key_file_load_from_file(f, config->config_file ? config->config_file : AVAHI_CONFIG_FILE, G_KEY_FILE_NONE, &err)) { fprintf(stderr, "Unable to read config file: %s\n", err->message); @@ -229,7 +347,12 @@ static gint load_config_file(DaemonConfig *config) { config->server_config.publish_workstation = is_yes(v); else if (g_strcasecmp(*k, "publish-domain") == 0) config->server_config.publish_domain = is_yes(v); - else { + else if (g_strcasecmp(*k, "publish-resolv-conf-dns-servers") == 0) + config->publish_resolv_conf = is_yes(v); + else if (g_strcasecmp(*k, "publish-dns-servers") == 0) { + g_strfreev(config->publish_dns_servers); + config->publish_dns_servers = g_key_file_get_string_list(f, *g, *k, NULL, NULL); + } else { fprintf(stderr, "Invalid configuration key \"%s\" in group \"%s\"\n", *k, *g); goto finish; } @@ -307,7 +430,10 @@ static void log_function(AvahiLogLevel level, const gchar *txt) { static gboolean signal_callback(GIOChannel *source, GIOCondition condition, gpointer data) { gint sig; + GMainLoop *loop = data; + g_assert(source); + g_assert(loop); if ((sig = daemon_signal_next()) <= 0) { avahi_log_error("daemon_signal_next() failed"); @@ -322,13 +448,24 @@ static gboolean signal_callback(GIOChannel *source, GIOCondition condition, gpoi "Got %s, quitting.", sig == SIGINT ? "SIGINT" : (sig == SIGQUIT ? "SIGQUIT" : "SIGTERM")); - g_main_loop_quit((GMainLoop*) data); + g_main_loop_quit(loop); break; case SIGHUP: avahi_log_info("Got SIGHUP, reloading."); static_service_load(); static_service_add_to_server(); + + if (resolv_conf_entry_group) { + avahi_entry_group_free(resolv_conf_entry_group); + resolv_conf_entry_group = NULL; + } + + load_resolv_conf(&config); + + if (resolv_conf && resolv_conf[0]) + resolv_conf_entry_group = add_dns_servers(avahi_server, resolv_conf); + break; default: @@ -371,8 +508,10 @@ static gint run_server(DaemonConfig *config) { goto finish; #endif - if (!(avahi_server = avahi_server_new(NULL, &config->server_config, server_callback, NULL))) + if (!(avahi_server = avahi_server_new(NULL, &config->server_config, server_callback, config))) goto finish; + + load_resolv_conf(config); static_service_load(); @@ -387,6 +526,7 @@ finish: static_service_remove_from_server(); static_service_free_all(); + remove_dns_server_entry_groups(); simple_protocol_shutdown(); @@ -395,6 +535,7 @@ finish: dbus_protocol_shutdown(); #endif + if (avahi_server) avahi_server_free(avahi_server); @@ -476,7 +617,7 @@ static gint drop_root(void) { } static const char* pid_file_proc(void) { - return AVAHI_RUNTIME_DIR"/pid"; + return AVAHI_RUNTIME_DIR"/avahi-daemon.pid"; } static gint make_runtime_dir(void) { @@ -525,12 +666,9 @@ fail: return r; } - - int main(int argc, char *argv[]) { gint r = 255; - DaemonConfig config; const gchar *argv0; gboolean wrote_pid_file = FALSE; @@ -542,6 +680,8 @@ int main(int argc, char *argv[]) { config.config_file = NULL; config.enable_dbus = TRUE; config.drop_root = TRUE; + config.publish_dns_servers = NULL; + config.publish_resolv_conf = FALSE; if ((argv0 = strrchr(argv[0], '/'))) argv0++; @@ -549,7 +689,6 @@ int main(int argc, char *argv[]) { argv0 = argv[0]; daemon_pid_file_ident = daemon_log_ident = (char *) argv0; - daemon_pid_file_proc = pid_file_proc; if (parse_command_line(&config, argc, argv) < 0) @@ -560,7 +699,7 @@ int main(int argc, char *argv[]) { r = 0; } else if (config.command == DAEMON_VERSION) { printf("%s "PACKAGE_VERSION"\n", argv0); - + r = 0; } else if (config.command == DAEMON_KILL) { if (daemon_pid_file_kill_wait(SIGTERM, 5) < 0) { avahi_log_warn("Failed to kill daemon: %s", strerror(errno)); @@ -594,7 +733,6 @@ int main(int argc, char *argv[]) { goto finish; if (config.daemonize) { - daemon_retval_init(); if ((pid = daemon_fork()) < 0) @@ -645,6 +783,8 @@ finish: avahi_server_config_free(&config.server_config); g_free(config.config_file); + g_strfreev(config.publish_dns_servers); + g_strfreev(resolv_conf); if (wrote_pid_file) daemon_pid_file_remove(); diff --git a/avahi-daemon/simple-protocol.c b/avahi-daemon/simple-protocol.c index c41e07c..39580dd 100644 --- a/avahi-daemon/simple-protocol.c +++ b/avahi-daemon/simple-protocol.c @@ -39,7 +39,7 @@ #include "simple-protocol.h" #include "main.h" -#define BUFFER_SIZE (10*1024) +#define BUFFER_SIZE (20*1024) #define UNIX_SOCKET AVAHI_RUNTIME_DIR "/socket" @@ -52,6 +52,7 @@ typedef enum { CLIENT_IDLE, CLIENT_RESOLVE_HOSTNAME, CLIENT_RESOLVE_ADDRESS, + CLIENT_BROWSE_DNS_SERVERS, CLIENT_DEAD } ClientState; @@ -68,6 +69,7 @@ struct Client { AvahiHostNameResolver *host_name_resolver; AvahiAddressResolver *address_resolver; + AvahiDNSServerBrowser *dns_server_browser; AVAHI_LLIST_FIELDS(Client, clients); }; @@ -96,6 +98,9 @@ static void client_free(Client *c) { if (c->address_resolver) avahi_address_resolver_free(c->address_resolver); + + if (c->dns_server_browser) + avahi_dns_server_browser_free(c->dns_server_browser); g_source_remove_poll(&c->server->source, &c->poll_fd); close(c->fd); @@ -117,6 +122,7 @@ static void client_new(Server *s, int fd) { c->host_name_resolver = NULL; c->address_resolver = NULL; + c->dns_server_browser = NULL; memset(&c->poll_fd, 0, sizeof(GPollFD)); c->poll_fd.fd = fd; @@ -146,14 +152,15 @@ static void client_output(Client *c, const guint8*data, guint size) { } static void client_output_printf(Client *c, gchar *format, ...) { - gchar txt[256]; + gchar *t; va_list ap; va_start(ap, format); - vsnprintf(txt, sizeof(txt), format, ap); + t = g_strdup_vprintf(format, ap); va_end(ap); - client_output(c, (guint8*) txt, strlen(txt)); + client_output(c, (guint8*) t, strlen(t)); + g_free(t); } static void host_name_resolver_callback(AvahiHostNameResolver *r, gint iface, guchar protocol, AvahiBrowserEvent event, const gchar *hostname, const AvahiAddress *a, gpointer userdata) { @@ -167,7 +174,7 @@ static void host_name_resolver_callback(AvahiHostNameResolver *r, gint iface, gu else { gchar t[64]; avahi_address_snprint(t, sizeof(t), a); - client_output_printf(c, "+ %s\n", t); + client_output_printf(c, "+ %i %u %s %s\n", iface, protocol, hostname, t); } c->state = CLIENT_DEAD; @@ -176,16 +183,30 @@ static void host_name_resolver_callback(AvahiHostNameResolver *r, gint iface, gu static void address_resolver_callback(AvahiAddressResolver *r, gint iface, guchar protocol, AvahiBrowserEvent event, const AvahiAddress *a, const gchar *hostname, gpointer userdata) { Client *c = userdata; + g_assert(c); if (event == AVAHI_RESOLVER_TIMEOUT) client_output_printf(c, "- Query timed out\n"); else - client_output_printf(c, "+ %s\n", hostname); + client_output_printf(c, "+ %i %u %s\n", iface, protocol, hostname); c->state = CLIENT_DEAD; } +static void dns_server_browser_callback(AvahiDNSServerBrowser *b, gint interface, guchar protocol, AvahiBrowserEvent event, const gchar *host_name, const AvahiAddress *a, guint16 port, gpointer userdata) { + Client *c = userdata; + gchar t[64]; + + g_assert(c); + + if (!a) + return; + + avahi_address_snprint(t, sizeof(t), a); + client_output_printf(c, "%c %i %u %s %u\n", event == AVAHI_BROWSER_NEW ? '>' : '<', interface, protocol, t, port); +} + static void handle_line(Client *c, const gchar *s) { gchar cmd[64], arg[64]; gint n_args; @@ -208,7 +229,10 @@ static void handle_line(Client *c, const gchar *s) { "+ RESOLVE-HOSTNAME \n" "+ RESOLVE-HOSTNAME-IPV6 \n" "+ RESOLVE-HOSTNAME-IPV4 \n" - "+ RESOLVE-ADDRESS
\n"); + "+ RESOLVE-ADDRESS
\n" + "+ BROWSE-DNS-SERVERS\n" + "+ BROWSE-DNS-SERVERS-IPV4\n" + "+ BROWSE-DNS-SERVERS-IPV6\n"); c->state = CLIENT_DEAD; } else if (strcmp(cmd, "FUCK") == 0 && n_args == 1) { client_output_printf(c, "FUCK: Go fuck yourself!\n"); @@ -232,6 +256,18 @@ static void handle_line(Client *c, const gchar *s) { c->state = CLIENT_RESOLVE_ADDRESS; c->address_resolver = avahi_address_resolver_new(avahi_server, -1, AF_UNSPEC, &addr, address_resolver_callback, c); } + } else if (strcmp(cmd, "BROWSE-DNS-SERVERS-IPV4") == 0 && n_args == 1) { + c->state = CLIENT_BROWSE_DNS_SERVERS; + c->dns_server_browser = avahi_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, AF_INET, dns_server_browser_callback, c); + client_output_printf(c, "+ Browsing ...\n"); + } else if (strcmp(cmd, "BROWSE-DNS-SERVERS-IPV6") == 0 && n_args == 1) { + c->state = CLIENT_BROWSE_DNS_SERVERS; + c->dns_server_browser = avahi_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, AF_INET6, dns_server_browser_callback, c); + client_output_printf(c, "+ Browsing ...\n"); + } else if (strcmp(cmd, "BROWSE-DNS-SERVERS") == 0 && n_args == 1) { + c->state = CLIENT_BROWSE_DNS_SERVERS; + c->dns_server_browser = avahi_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, AF_UNSPEC, dns_server_browser_callback, c); + client_output_printf(c, "+ Browsing ...\n"); } else { client_output_printf(c, "- Invalid command \"%s\", try \"HELP\".\n", cmd); c->state = CLIENT_DEAD; diff --git a/avahi-dnsconfd/Makefile.am b/avahi-dnsconfd/Makefile.am new file mode 100644 index 0000000..8a0787a --- /dev/null +++ b/avahi-dnsconfd/Makefile.am @@ -0,0 +1,51 @@ +# $Id$ +# +# This file is part of avahi. +# +# avahi is free software; you can redistribute it and/or modify it +# under the terms of the GNU Lesser General Public License as +# published by the Free Software Foundation; either version 2 of the +# License, or (at your option) any later version. +# +# avahi is distributed in the hope that it will be useful, but WITHOUT +# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY +# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public +# License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with avahi; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 +# USA. + +pkgsysconfdir=$(sysconfdir)/avahi + +AM_CFLAGS= \ + -I$(top_srcdir) \ + -D_GNU_SOURCE \ + -DAVAHI_DNSCONF_SCRIPT=\"$(pkgsysconfdir)/dnsconf.action\" \ + -DAVAHI_SOCKET=\"$(localstatedir)/run/avahi/socket\" \ + -DAVAHI_RUNTIME_DIR=\"$(localstatedir)/run\" + +# GLIB 2.0 +AM_CFLAGS+=$(GLIB20_CFLAGS) +AM_LDADD=$(GLIB20_LIBS) + +# libdaemon +AM_CFLAGS+=$(LIBDAEMON_CFLAGS) +AM_LDADD+=$(LIBDAEMON_LIBS) + +# This cool debug trap works on i386/gcc only +AM_CFLAGS+='-DDEBUG_TRAP=__asm__("int $$3")' + +bin_PROGRAMS = \ + avahi-dnsconfd + +avahi_dnsconfd_SOURCES = \ + main.c main.h + +avahi_dnsconfd_CFLAGS = $(AM_CFLAGS) +avahi_dnsconfd_LDADD = $(AM_LDADD) ../avahi-common/libavahi-common.la + +pkgsysconf_DATA=dnsconf.action + +EXTRA_DIST=dnsconf.action diff --git a/avahi-dnsconfd/dnsconf.action b/avahi-dnsconfd/dnsconf.action new file mode 100755 index 0000000..9337a6d --- /dev/null +++ b/avahi-dnsconfd/dnsconf.action @@ -0,0 +1,62 @@ +#!/bin/sh + +# $Id$ +# +# This file is part of avahi. +# +# avahi is free software; you can redistribute it and/or modify it +# under the terms of the GNU Lesser General Public License as +# published by the Free Software Foundation; either version 2 of the +# License, or (at your option) any later version. +# +# avahi is distributed in the hope that it will be useful, but WITHOUT +# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY +# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public +# License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with avahi; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 +# USA. + +set -e + +test "x$AVAHI_INTERFACE" != "x" + +# Command line arguments: +# $1 "+" if a new DNS server was found, "-" if one was removed +# $2 DNS Server address +# $3 interface index where this server was found on +# $4 protocol number where this server was found on + +# Available environment variables: +# +# $AVAHI_INTERFACE The interface name where this DNS server was found on +# $AVAHI_INTERFACE_DNS_SERVERS A whitespace seperated list of DNS servers on $AVAHI_INTERFACE +# $AVAHI_DNS_SERVERS The complete list of all DNS servers found on all interfaces + +if [ -x /sbin/resolvconf ] ; then + + # We have Debian's resolvconf tool + + if [ "x$AVAHI_INTERFACE_DNS_SERVERS" = "x" ] ; then + /sbin/resolvconf -d "$AVAHI_INTERFACE.avahi" + else + for n in $AVAHI_INTERFACE_DNS_SERVERS ; do + echo "nameserver $n" + done | /sbin/resolvconf -a "$AVAHI_INTERFACE.avahi" + fi +else + + # No resolvconf tool available + + if [ "x$AVAHI_DNS_SERVERS" = "x" ] ; then + test -f /etc/resolv.conf.avahi && mv /etc/resolv.conf.avahi /etc/resolv.conf + else + test -f /etc/resolv.conf.avahi || mv /etc/resolv.conf /etc/resolv.conf.avahi + + for n in $AVAHI_DNS_SERVERS ; do + echo "nameserver $n" + done > /etc/resolv.conf + fi +fi diff --git a/avahi-dnsconfd/main.c b/avahi-dnsconfd/main.c new file mode 100644 index 0000000..918beeb --- /dev/null +++ b/avahi-dnsconfd/main.c @@ -0,0 +1,608 @@ +/* $Id$ */ + +/*** + This file is part of avahi. + + avahi is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + avahi is distributed in the hope that it will be useful, but WITHOUT + ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General + Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with avahi; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA. +***/ + +#ifdef HAVE_CONFIG_H +#include +#endif + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include +#include + +#include +#include +#include +#include +#include + +#define BROWSE_DNS_SERVERS "BROWSE-DNS-SERVERS\n" + +static enum { + ACKWAIT, + BROWSING +} state = ACKWAIT; + +static gboolean quit = FALSE; + +static enum { + DAEMON_RUN, + DAEMON_KILL, + DAEMON_RELOAD, + DAEMON_VERSION, + DAEMON_HELP +} command = DAEMON_RUN; + +static gboolean daemonize = FALSE; + +typedef struct DNSServerInfo DNSServerInfo; + +struct DNSServerInfo { + gint interface; + guchar protocol; + gchar *address; + AVAHI_LLIST_FIELDS(DNSServerInfo, servers); +}; + +static AVAHI_LLIST_HEAD(DNSServerInfo, servers); + +static void server_info_free(DNSServerInfo *i) { + g_assert(i); + + g_free(i->address); + + AVAHI_LLIST_REMOVE(DNSServerInfo, servers, servers, i); + g_free(i); +} + +static DNSServerInfo* get_server_info(gint interface, guchar protocol, const gchar *address) { + DNSServerInfo *i; + g_assert(address); + + for (i = servers; i; i = i->servers_next) + if (i->interface == interface && + i->protocol == protocol && + strcmp(i->address, address) == 0) + return i; + + return NULL; +} + +static DNSServerInfo* new_server_info(gint interface, guchar protocol, const gchar *address) { + DNSServerInfo *i; + + g_assert(address); + + i = g_new(DNSServerInfo, 1); + i->interface = interface; + i->protocol = protocol; + i->address = g_strdup(address); + + AVAHI_LLIST_PREPEND(DNSServerInfo, servers, servers, i); + + return i; +} + +static int open_socket(void) { + int fd = -1; + struct sockaddr_un sa; + + if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { + daemon_log(LOG_ERR, "socket(): %s", strerror(errno)); + goto fail; + } + + if (avahi_set_cloexec(fd) < 0) { + daemon_log(LOG_ERR, "fcntl(): %s", strerror(errno)); + goto fail; + } + + memset(&sa, 0, sizeof(sa)); + sa.sun_family = AF_UNIX; + strncpy(sa.sun_path, AVAHI_SOCKET, sizeof(sa.sun_path)-1); + sa.sun_path[sizeof(sa.sun_path)-1] = 0; + + if (connect(fd, (struct sockaddr*) &sa, sizeof(sa)) < 0) { + daemon_log(LOG_ERR, "connect(): %s", strerror(errno)); + goto fail; + } + + return fd; + +fail: + if (fd >= 0) + close(fd); + + return -1; +} + +static ssize_t loop_write(int fd, const void*data, size_t size) { + + ssize_t ret = 0; + g_assert(fd >= 0 && data && size); + + while (size > 0) { + ssize_t r; + + if ((r = write(fd, data, size)) < 0) + return r; + + if (r == 0) + break; + + ret += r; + data = (guint8*) data + r; + size -= r; + } + + return ret; +} + +static gchar *concat_dns_servers(gint interface) { + DNSServerInfo *i; + gchar *r = NULL; + + for (i = servers; i; i = i->servers_next) + if (i->interface == interface || interface <= 0) { + gchar *t; + + if (!r) + t = g_strdup(i->address); + else + t = g_strdup_printf("%s %s", r, i->address); + + g_free(r); + r = t; + } + + return r; +} + +static gchar *getifname(gint interface, gchar *name, guint len) { + int fd = -1; + gchar *ret = NULL; + struct ifreq ifr; + + g_assert(interface >= 0); + + if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) { + daemon_log(LOG_ERR, "socket(): %s", strerror(errno)); + goto finish; + } + + memset(&ifr, 0, sizeof(ifr)); + ifr.ifr_ifindex = interface; + + if (ioctl(fd, SIOCGIFNAME, &ifr) < 0) { + daemon_log(LOG_ERR, "SIOCGIFNAME: %s\n", strerror(errno)); + goto finish; + } + + strncpy(name, ifr.ifr_name, len-1); + name[len-1] = 0; + ret = name; + +finish: + if (fd >= 0) + close(fd); + + return ret; + } + +static void run_script(gboolean new, gint interface, guchar protocol, const gchar *address) { + gchar *p; + g_assert(interface > 0); + gint ret; + gchar ia[16], pa[16]; + gchar name[IFNAMSIZ+1]; + + if (!getifname(interface, name, sizeof(name))) + return; + + p = concat_dns_servers(interface); + g_setenv("AVAHI_INTERFACE_DNS_SERVERS", p ? p : "", TRUE); + g_free(p); + + p = concat_dns_servers(-1); + g_setenv("AVAHI_DNS_SERVERS", p ? p : "", TRUE); + g_free(p); + + g_setenv("AVAHI_INTERFACE", name, TRUE); + + snprintf(ia, sizeof(ia), "%i", interface); + snprintf(pa, sizeof(pa), "%u", protocol); + + if (daemon_exec("/", &ret, AVAHI_DNSCONF_SCRIPT, AVAHI_DNSCONF_SCRIPT, new ? "+" : "-", address, ia, pa, NULL) < 0) + daemon_log(LOG_WARNING, "Failed to run script"); + else if (ret != 0) + daemon_log(LOG_WARNING, "Script returned with non-zero exit code %i", ret); +} + +static gint new_line(const gchar *l) { + g_assert(l); + + if (state == ACKWAIT) { + if (*l != '+') { + daemon_log(LOG_ERR, "Avahi command failed: %s", l); + return -1; + } + + daemon_log(LOG_INFO, "Successfully connected to Avahi daemon."); + state = BROWSING; + } else { + gint interface; + guint protocol; + guint port; + gchar a[64]; + + g_assert(state == BROWSING); + + if (*l != '<' && *l != '>') { + daemon_log(LOG_ERR, "Avahi sent us an invalid browsing line: %s", l); + return -1; + } + + if (sscanf(l+1, "%i %u %64s %u", &interface, &protocol, a, &port) != 4) { + daemon_log(LOG_ERR, "Failed to parse browsing line: %s", l); + return -1; + } + + if (*l == '>') { + if (port != 53) + daemon_log(LOG_WARNING, "DNS server with port address != 53 found, ignoring"); + else { + daemon_log(LOG_INFO, "New DNS Server %s (interface: %i.%u)", a, interface, protocol); + new_server_info(interface, (guchar) protocol, a); + run_script(TRUE, interface, (guchar) protocol, a); + } + } else { + DNSServerInfo *i; + + if (port == 53) + if ((i = get_server_info(interface, (guchar) protocol, a))) { + daemon_log(LOG_INFO, "DNS Server %s removed (interface: %i.%u)", a, interface, protocol); + server_info_free(i); + run_script(FALSE, interface, (guchar) protocol, a); + } + } + + } + + return 0; +} + +static gint do_connect(void) { + gint fd = -1; + + if ((fd = open_socket()) < 0) + goto fail; + + if (loop_write(fd, BROWSE_DNS_SERVERS, sizeof(BROWSE_DNS_SERVERS)-1) < 0) { + daemon_log(LOG_ERR, "write(): %s", strerror(errno)); + goto fail; + } + + state = ACKWAIT; + return fd; + +fail: + if (fd >= 0) + close(fd); + + return -1; +} + +static void free_dns_server_info_list(void) { + while (servers) { + gint interface = servers->interface; + guchar protocol = servers->protocol; + gchar *address = g_strdup(servers->address); + server_info_free(servers); + + run_script(FALSE, interface, protocol, address); + g_free(address); + } +} + +static void help(FILE *f, const gchar *argv0) { + fprintf(f, + "%s [options]\n" + " -h --help Show this help\n" + " -D --daemonize Daemonize after startup\n" + " -k --kill Kill a running daemon\n" + " -r --reload Request a running daemon to reload static services\n" + " -V --version Show version\n", + argv0); +} + +static gint parse_command_line(int argc, char *argv[]) { + gint c; + + static const struct option const long_options[] = { + { "help", no_argument, NULL, 'h' }, + { "daemonize", no_argument, NULL, 'D' }, + { "kill", no_argument, NULL, 'k' }, + { "version", no_argument, NULL, 'V' }, + { "reload", no_argument, NULL, 'r' }, + }; + + opterr = 0; + while ((c = getopt_long(argc, argv, "hDkVr", long_options, NULL)) >= 0) { + + switch(c) { + case 'h': + command = DAEMON_HELP; + break; + case 'D': + daemonize = TRUE; + break; + case 'k': + command = DAEMON_KILL; + break; + case 'V': + command = DAEMON_VERSION; + break; + case 'r': + command = DAEMON_RELOAD; + break; + default: + fprintf(stderr, "Invalid command line argument: %c\n", c); + return -1; + } + } + + if (optind < argc) { + fprintf(stderr, "Too many arguments\n"); + return -1; + } + + return 0; +} + +static int run_daemon(void) { + gint fd = -1, ret = -1; + gchar buf[1024]; + size_t buflen = 0; + + AVAHI_LLIST_HEAD_INIT(DNSServerInfo, servers); + + daemon_signal_init(SIGINT, SIGTERM, SIGCHLD, SIGHUP, 0); + + if ((fd = do_connect()) < 0) + goto finish; + + if (daemonize) + daemon_retval_send(0); + + while (!quit) { + fd_set rfds, wfds; + + FD_ZERO(&rfds); + FD_ZERO(&wfds); + + FD_SET(fd, &rfds); + FD_SET(daemon_signal_fd(), &rfds); + + for (;;) { + if (select(fd+1, &rfds, NULL, NULL, NULL) < 0) { + if (errno == EINTR) + continue; + + daemon_log(LOG_ERR, "select(): %s", strerror(errno)); + goto finish; + } + + break; + } + + if (FD_ISSET(daemon_signal_fd(), &rfds)) { + + int sig; + + if ((sig = daemon_signal_next()) <= 0) { + daemon_log(LOG_ERR, "daemon_signal_next() failed"); + goto finish; + } + + switch(sig) { + case SIGINT: + case SIGTERM: + daemon_log(LOG_INFO, "Got %s, quitting.", sig == SIGINT ? "SIGINT" : "SIGTERM"); + ret = 0; + goto finish; + + case SIGCHLD: + waitpid(-1, NULL, WNOHANG); + break; + + case SIGHUP: + daemon_log(LOG_INFO, "Rrefreshing DNS Server list"); + + close(fd); + free_dns_server_info_list(); + + if ((fd = do_connect()) < 0) + goto finish; + + break; + } + + } else if (FD_ISSET(fd, &rfds)) { + ssize_t r; + gchar *n; + + if ((r = read(fd, buf, sizeof(buf) - buflen - 1)) <= 0) { + daemon_log(LOG_ERR, "read(): %s", r < 0 ? strerror(errno) : "EOF"); + goto finish; + } + + buflen += r; + g_assert(buflen <= sizeof(buf)-1); + + while ((n = memchr(buf, '\n', buflen))) { + *(n++) = 0; + + if (new_line(buf) < 0) + goto finish; + + buflen -= (n - buf); + memmove(buf, n, buflen); + } + + if (buflen >= sizeof(buf)-1) { + /* The incoming line is horribly long */ + buf[sizeof(buf)-1] = 0; + + if (new_line(buf) < 0) + goto finish; + + buflen = 0; + } + } + } + + ret = 0; + +finish: + + free_dns_server_info_list(); + + if (fd >= 0) + close(fd); + + daemon_signal_done(); + + return ret; +} + +static const char* pid_file_proc(void) { + return AVAHI_RUNTIME_DIR"/avahi-dnsconfd.pid"; +} + +gint main(gint argc, gchar *argv[]) { + gchar *argv0; + gint r = 1; + gboolean wrote_pid_file = FALSE; + + if ((argv0 = strrchr(argv[0], '/'))) + argv0++; + else + argv0 = argv[0]; + + daemon_pid_file_ident = daemon_log_ident = argv0; + daemon_pid_file_proc = pid_file_proc; + + if (parse_command_line(argc, argv) < 0) + goto finish; + + if (command == DAEMON_RUN) { + pid_t pid; + + if (getuid() != 0) { + daemon_log(LOG_ERR, "This program is intended to be run as root."); + goto finish; + } + + if ((pid = daemon_pid_file_is_running()) >= 0) { + daemon_log(LOG_ERR, "Daemon already running on PID %u", pid); + goto finish; + } + + if (daemonize) { + daemon_retval_init(); + + if ((pid = daemon_fork()) < 0) + goto finish; + else if (pid != 0) { + int ret; + /** Parent **/ + + if ((ret = daemon_retval_wait(20)) < 0) { + daemon_log(LOG_ERR, "Could not recieve return value from daemon process."); + goto finish; + } + + r = ret; + goto finish; + } + + /* Child */ + } + + chdir("/"); + + if (daemon_pid_file_create() < 0) { + daemon_log(LOG_ERR, "Failed to create PID file: %s", strerror(errno)); + + if (daemonize) + daemon_retval_send(1); + goto finish; + } else + wrote_pid_file = TRUE; + + if (run_daemon() < 0) + goto finish; + + } else if (command == DAEMON_HELP) { + help(stdout, argv0); + + } else if (command == DAEMON_VERSION) { + printf("%s "PACKAGE_VERSION"\n", argv0); + + } else if (command == DAEMON_KILL) { + if (daemon_pid_file_kill_wait(SIGTERM, 5) < 0) { + daemon_log(LOG_WARNING, "Failed to kill daemon: %s", strerror(errno)); + goto finish; + } + + } else if (command == DAEMON_RELOAD) { + if (daemon_pid_file_kill(SIGHUP) < 0) { + daemon_log(LOG_WARNING, "Failed to kill daemon: %s", strerror(errno)); + goto finish; + } + } + + r = 0; + +finish: + + if (daemonize) + daemon_retval_done(); + + if (wrote_pid_file) + daemon_pid_file_remove(); + + return r; +} diff --git a/configure.ac b/configure.ac index 97a57e5..2bbea03 100644 --- a/configure.ac +++ b/configure.ac @@ -234,24 +234,23 @@ avahi-client/Makefile initscript/Makefile initscript/Debian/Makefile initscript/Debian/75avahi +avahi-dnsconfd/Makefile ]) AC_OUTPUT dnl ========================================================================== echo " - $PACKAGE_NAME $VERSION - ============ - - prefix: ${prefix} - sysconfdir: ${sysconfdir} - dbus-1 system.d dir: ${DBUS_SYS_DIR} - dbus-1 version: `pkg-config dbus-1 --modversion` - compiler: ${CC} - cflags: ${CFLAGS} - Linux Distro: ${with_distro} - User for Avahi: ${AVAHI_USER} - Group for Avahi: ${AVAHI_GROUP} + ---{ $PACKAGE_NAME $VERSION }--- + + prefix: ${prefix} + sysconfdir: ${sysconfdir} + dbus-1 system.d dir: ${DBUS_SYS_DIR} + dbus-1 version: `pkg-config dbus-1 --modversion` + compiler: ${CC} + cflags: ${CFLAGS} + Linux Distro: ${with_distro} + User for Avahi: ${AVAHI_USER} + Group for Avahi: ${AVAHI_GROUP} + + NOTE: Remember to create user ${AVAHI_USER} and group ${AVAHI_GROUP} before make install " - -echo "NOTE: Remember to create user ${AVAHI_USER} and group ${AVAHI_GROUP} before make install" -echo diff --git a/todo b/todo index 9f19798..0be5a5e 100644 --- a/todo +++ b/todo @@ -1,5 +1,9 @@ todo: * release! +* support for special domain PTR records based on local IP subnet address +* Introduce AvahiProtocol +* drop trailing dot on avahi_normalize_name() +* c++ support done: * Probing/Conflict resolution -- 2.39.5