#include <glib.h>
-#include <avahi-core/llist.h>
+#include <avahi-common/llist.h>
+#include <avahi-core/log.h>
#include "simple-protocol.h"
+#include "main.h"
-#define BUFFER_SIZE (10*1024)
-
-#define UNIX_SOCKET_PATH "/tmp/avahi"
-#define UNIX_SOCKET UNIX_SOCKET_PATH"/socket"
+#define BUFFER_SIZE (20*1024)
#define CLIENTS_MAX 50
typedef struct Client Client;
typedef struct Server Server;
+typedef enum {
+ CLIENT_IDLE,
+ CLIENT_RESOLVE_HOSTNAME,
+ CLIENT_RESOLVE_ADDRESS,
+ CLIENT_BROWSE_DNS_SERVERS,
+ CLIENT_DEAD
+} ClientState;
+
struct Client {
Server *server;
+
+ ClientState state;
gint fd;
GPollFD poll_fd;
gchar inbuf[BUFFER_SIZE], outbuf[BUFFER_SIZE];
guint inbuf_length, outbuf_length;
+
+ AvahiSHostNameResolver *host_name_resolver;
+ AvahiSAddressResolver *address_resolver;
+ AvahiSDNSServerBrowser *dns_server_browser;
+
+ AvahiProtocol afquery;
AVAHI_LLIST_FIELDS(Client, clients);
};
AVAHI_LLIST_HEAD(Client, clients);
guint n_clients;
+ gboolean bind_successful;
};
static Server *server = NULL;
g_assert(c->server->n_clients >= 1);
c->server->n_clients--;
+
+ if (c->host_name_resolver)
+ avahi_s_host_name_resolver_free(c->host_name_resolver);
+
+ if (c->address_resolver)
+ avahi_s_address_resolver_free(c->address_resolver);
+
+ if (c->dns_server_browser)
+ avahi_s_dns_server_browser_free(c->dns_server_browser);
g_source_remove_poll(&c->server->source, &c->poll_fd);
close(c->fd);
c = g_new(Client, 1);
c->server = s;
c->fd = fd;
+ c->state = CLIENT_IDLE;
c->inbuf_length = c->outbuf_length = 0;
+ 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;
c->poll_fd.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
memcpy(c->outbuf + c->outbuf_length, data, m);
c->outbuf_length += m;
+
+ c->poll_fd.events |= G_IO_OUT;
+}
+
+static void client_output_printf(Client *c, const gchar *format, ...) {
+ gchar *t;
+ va_list ap;
+
+ va_start(ap, format);
+ t = g_strdup_vprintf(format, ap);
+ va_end(ap);
+
+ client_output(c, (guint8*) t, strlen(t));
+ g_free(t);
+}
+
+
+static void host_name_resolver_callback(
+ AvahiSHostNameResolver *r,
+ AvahiIfIndex iface,
+ AvahiProtocol protocol,
+ AvahiResolverEvent event,
+ const char *hostname,
+ const AvahiAddress *a,
+ void* userdata) {
+
+ Client *c = userdata;
+
+ g_assert(c);
+
+ if (event == AVAHI_RESOLVER_TIMEOUT)
+ client_output_printf(c, "%+i Query timed out\n", AVAHI_ERR_TIMEOUT);
+ else {
+ gchar t[64];
+ avahi_address_snprint(t, sizeof(t), a);
+ client_output_printf(c, "+ %i %u %s %s\n", iface, protocol, hostname, t);
+ }
+
+ c->state = CLIENT_DEAD;
+}
+
+static void address_resolver_callback(
+ AvahiSAddressResolver *r,
+ AvahiIfIndex iface,
+ AvahiProtocol protocol,
+ AvahiResolverEvent event,
+ const AvahiAddress *a,
+ const char *hostname,
+ void* userdata) {
+
+ Client *c = userdata;
+
+ g_assert(c);
+
+ if (event == AVAHI_RESOLVER_TIMEOUT)
+ client_output_printf(c, "%+i Query timed out\n", AVAHI_ERR_TIMEOUT);
+ else
+ client_output_printf(c, "+ %i %u %s\n", iface, protocol, hostname);
+
+ c->state = CLIENT_DEAD;
+}
+
+static void dns_server_browser_callback(
+ AvahiSDNSServerBrowser *b,
+ AvahiIfIndex interface,
+ AvahiProtocol protocol,
+ AvahiBrowserEvent event,
+ const char *host_name,
+ const AvahiAddress *a,
+ uint16_t port,
+ void* 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 t[256];
+ gchar cmd[64], arg[64];
+ gint n_args;
g_assert(c);
g_assert(s);
- snprintf(t, sizeof(t), "you said <%s>\n", s);
- client_output(c, (guint8*) t, strlen(t));
+ if (c->state != CLIENT_IDLE)
+ return;
+
+ if ((n_args = sscanf(s, "%63s %63s", cmd, arg)) < 1 ) {
+ client_output_printf(c, "%+i Failed to parse command, try \"HELP\".\n", AVAHI_ERR_INVALID_OPERATION);
+ c->state = CLIENT_DEAD;
+ return;
+ }
+
+ if (strcmp(cmd, "HELP") == 0) {
+ client_output_printf(c,
+ "+ Available commands are:\n"
+ "+ RESOLVE-HOSTNAME <hostname>\n"
+ "+ RESOLVE-HOSTNAME-IPV6 <hostname>\n"
+ "+ RESOLVE-HOSTNAME-IPV4 <hostname>\n"
+ "+ RESOLVE-ADDRESS <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");
+ c->state = CLIENT_DEAD;
+ } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV4") == 0 && n_args == 2) {
+ c->state = CLIENT_RESOLVE_HOSTNAME;
+ if (!(c->host_name_resolver = avahi_s_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, c->afquery = AF_INET, host_name_resolver_callback, c)))
+ goto fail;
+ } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV6") == 0 && n_args == 2) {
+ c->state = CLIENT_RESOLVE_HOSTNAME;
+ if (!(c->host_name_resolver = avahi_s_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, c->afquery = AF_INET6, host_name_resolver_callback, c)))
+ goto fail;
+ } else if (strcmp(cmd, "RESOLVE-HOSTNAME") == 0 && n_args == 2) {
+ c->state = CLIENT_RESOLVE_HOSTNAME;
+ if (!(c->host_name_resolver = avahi_s_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, c->afquery = AF_UNSPEC, host_name_resolver_callback, c)))
+ goto fail;
+ } else if (strcmp(cmd, "RESOLVE-ADDRESS") == 0 && n_args == 2) {
+ AvahiAddress addr;
+
+ if (!(avahi_address_parse(arg, AF_UNSPEC, &addr))) {
+ client_output_printf(c, "%+i Failed to parse address \"%s\".\n", AVAHI_ERR_INVALID_ADDRESS, arg);
+ c->state = CLIENT_DEAD;
+ } else {
+ c->state = CLIENT_RESOLVE_ADDRESS;
+ if (!(c->address_resolver = avahi_s_address_resolver_new(avahi_server, -1, AF_UNSPEC, &addr, address_resolver_callback, c)))
+ goto fail;
+ }
+ } else if (strcmp(cmd, "BROWSE-DNS-SERVERS-IPV4") == 0 && n_args == 1) {
+ c->state = CLIENT_BROWSE_DNS_SERVERS;
+ if (!(c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery = AF_INET, dns_server_browser_callback, c)))
+ goto fail;
+ client_output_printf(c, "+ Browsing ...\n");
+ } else if (strcmp(cmd, "BROWSE-DNS-SERVERS-IPV6") == 0 && n_args == 1) {
+ c->state = CLIENT_BROWSE_DNS_SERVERS;
+ if (!(c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery = AF_INET6, dns_server_browser_callback, c)))
+ goto fail;
+ client_output_printf(c, "+ Browsing ...\n");
+ } else if (strcmp(cmd, "BROWSE-DNS-SERVERS") == 0 && n_args == 1) {
+ c->state = CLIENT_BROWSE_DNS_SERVERS;
+ if (!(c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery = AF_UNSPEC, dns_server_browser_callback, c)))
+ goto fail;
+ client_output_printf(c, "+ Browsing ...\n");
+ } else {
+ client_output_printf(c, "%+i Invalid command \"%s\", try \"HELP\".\n", AVAHI_ERR_INVALID_OPERATION, cmd);
+ c->state = CLIENT_DEAD;
+ }
+
+ return;
+
+fail:
+ client_output_printf(c, "%+i %s\n", avahi_server_errno(avahi_server), avahi_strerror(avahi_server_errno(avahi_server)));
+ c->state = CLIENT_DEAD;
}
static void handle_input(Client *c) {
if ((r = read(c->fd, c->inbuf + c->inbuf_length, sizeof(c->inbuf) - c->inbuf_length)) <= 0) {
if (r < 0)
- g_warning("read(): %s", strerror(errno));
+ avahi_log_warn("read(): %s", strerror(errno));
client_free(c);
return;
}
ssize_t r;
if ((r = write(c->fd, c->outbuf, c->outbuf_length)) < 0) {
- g_warning("write(): %s", strerror(errno));
+ avahi_log_warn("write(): %s", strerror(errno));
client_free(c);
return;
}
if (c->outbuf_length)
memmove(c->outbuf, c->outbuf + r, c->outbuf_length - r);
+
+ if (c->outbuf_length == 0 && c->state == CLIENT_DEAD) {
+ client_free(c);
+ return;
+ }
}
c->poll_fd.events =
gint fd;
if ((fd = accept(s->fd, NULL, NULL)) < 0)
- g_warning("accept(): %s", strerror(errno));
+ avahi_log_warn("accept(): %s", strerror(errno));
else
client_new(s, fd);
} else if (s->poll_fd.revents)
g_assert(!server);
server = (Server*) g_source_new(&source_funcs, sizeof(Server));
+ server->bind_successful = FALSE;
server->fd = -1;
AVAHI_LLIST_HEAD_INIT(Client, server->clients);
- if (c)
- g_main_context_ref(server->context = c);
- else
- server->context = g_main_context_default();
+ g_main_context_ref(server->context = (c ? c : g_main_context_default()));
server->clients = NULL;
u = umask(0000);
- if (mkdir(UNIX_SOCKET_PATH, 0755) < 0 && errno != EEXIST) {
- g_warning("mkdir(): %s", strerror(errno));
- goto fail;
- }
-
if ((server->fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
- g_warning("socket(PF_LOCAL, SOCK_STREAM, 0): %s", strerror(errno));
+ avahi_log_warn("socket(PF_LOCAL, SOCK_STREAM, 0): %s", strerror(errno));
goto fail;
}
memset(&sa, 0, sizeof(sa));
sa.sun_family = AF_LOCAL;
- strncpy(sa.sun_path, UNIX_SOCKET, sizeof(sa.sun_path)-1);
+ strncpy(sa.sun_path, AVAHI_SOCKET, sizeof(sa.sun_path)-1);
+ /* We simply remove existing UNIX sockets under this name. The
+ Avahi daemons makes sure that it runs only once on a host,
+ therefore sockets that already exist are stale and may be
+ removed without any ill effects */
+
+ unlink(AVAHI_SOCKET);
+
if (bind(server->fd, &sa, sizeof(sa)) < 0) {
- g_warning("bind(): %s", strerror(errno));
+ avahi_log_warn("bind(): %s", strerror(errno));
goto fail;
}
+
+ server->bind_successful = TRUE;
if (listen(server->fd, 2) < 0) {
- g_warning("listen(): %s", strerror(errno));
+ avahi_log_warn("listen(): %s", strerror(errno));
goto fail;
}
while (server->clients)
client_free(server->clients);
+
+ if (server->bind_successful)
+ unlink(AVAHI_SOCKET);
- if (server->fd >= 0) {
- unlink(UNIX_SOCKET_PATH);
+ if (server->fd >= 0)
close(server->fd);
- }
g_main_context_unref(server->context);
+
g_source_destroy(&server->source);
g_source_unref(&server->source);
server = NULL;
}
}
+
+void simple_protocol_restart_queries(void) {
+ Client *c;
+
+ /* Restart queries in case of local domain name changes */
+
+ g_assert(server);
+
+ for (c = server->clients; c; c = c->clients_next)
+ if (c->state == CLIENT_BROWSE_DNS_SERVERS && c->dns_server_browser) {
+ avahi_s_dns_server_browser_free(c->dns_server_browser);
+ c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery, dns_server_browser_callback, c);
+ }
+}
+
+
projects / catta / blobdiff