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/* -*- c-file-style: "java"; indent-tabs-mode: nil; tab-width: 4; fill-column: 78 -*-
*
* Copyright (C) 2007 Lennart Poettering
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#include <config.h>
#include <assert.h>
#include <stdio.h>
#include <sys/select.h>
#include <signal.h>
#include <sys/file.h>
#include <sys/time.h>
#include <time.h>
#include <sys/stat.h>
#include <sys/poll.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <avahi-common/thread-watch.h>
#include <avahi-common/error.h>
#include <avahi-common/alternative.h>
#include <avahi-common/malloc.h>
#include <avahi-client/publish.h>
#include "distcc.h"
#include "zeroconf.h"
#include "trace.h"
#include "exitcode.h"
struct context {
char *name;
AvahiThreadedPoll *threaded_poll;
AvahiClient *client;
AvahiEntryGroup *group;
uint16_t port;
int n_cpus;
int n_jobs;
};
static void publish_reply(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata);
static void register_stuff(struct context *ctx) {
#ifndef ENABLE_RFC2553
static const AvahiProtocol dcc_proto = AVAHI_PROTO_INET;
#else
static const AvahiProtocol dcc_proto = AVAHI_PROTO_UNSPEC;
#endif
if (!ctx->group) {
if (!(ctx->group = avahi_entry_group_new(ctx->client, publish_reply, ctx))) {
rs_log_crit("Failed to create entry group: %s\n", avahi_strerror(avahi_client_errno(ctx->client)));
goto fail;
}
}
if (avahi_entry_group_is_empty(ctx->group)) {
char cpus[32], jobs[32], machine[64] = "cc_machine=", version[64] = "cc_version=", *m, *v;
snprintf(cpus, sizeof(cpus), "cpus=%i", ctx->n_cpus);
snprintf(jobs, sizeof(jobs), "jobs=%i", ctx->n_jobs);
v = dcc_get_gcc_version(version+11, sizeof(version)-11);
m = dcc_get_gcc_machine(machine+11, sizeof(machine)-11);
/* Register our service */
if (avahi_entry_group_add_service(
ctx->group,
AVAHI_IF_UNSPEC,
dcc_proto,
0,
ctx->name,
DCC_DNS_SERVICE_TYPE,
NULL,
NULL,
ctx->port,
"txtvers=1",
cpus,
jobs,
"distcc="PACKAGE_VERSION,
"gnuhost="GNU_HOST,
v ? version : NULL,
m ? machine : NULL,
(void*)NULL) < 0) {
rs_log_crit("Failed to add service: %s\n", avahi_strerror(avahi_client_errno(ctx->client)));
goto fail;
}
if (v && m) {
char stype[128];
dcc_make_dnssd_subtype(stype, sizeof(stype), v, m);
if (avahi_entry_group_add_service_subtype(
ctx->group,
AVAHI_IF_UNSPEC,
AVAHI_PROTO_UNSPEC,
0,
ctx->name,
DCC_DNS_SERVICE_TYPE,
NULL,
stype) < 0) {
rs_log_crit("Failed to add service: %s\n", avahi_strerror(avahi_client_errno(ctx->client)));
goto fail;
}
} else
rs_log_warning("Failed to determine CC version, not registering DNS-SD service subtype!");
if (avahi_entry_group_commit(ctx->group) < 0) {
rs_log_crit("Failed to commit entry group: %s\n", avahi_strerror(avahi_client_errno(ctx->client)));
goto fail;
}
}
return;
fail:
avahi_threaded_poll_quit(ctx->threaded_poll);
}
/* Called when publishing of service data completes */
static void publish_reply(AvahiEntryGroup *UNUSED(g), AvahiEntryGroupState state, void *userdata) {
struct context *ctx = userdata;
switch (state) {
case AVAHI_ENTRY_GROUP_COLLISION: {
char *n;
/* Pick a new name for our service */
n = avahi_alternative_service_name(ctx->name);
assert(n);
avahi_free(ctx->name);
ctx->name = n;
register_stuff(ctx);
break;
}
case AVAHI_ENTRY_GROUP_FAILURE:
rs_log_crit("Failed to register service: %s\n", avahi_strerror(avahi_client_errno(ctx->client)));
avahi_threaded_poll_quit(ctx->threaded_poll);
break;
case AVAHI_ENTRY_GROUP_UNCOMMITED:
case AVAHI_ENTRY_GROUP_REGISTERING:
case AVAHI_ENTRY_GROUP_ESTABLISHED:
;
}
}
static void client_callback(AvahiClient *client, AvahiClientState state, void *userdata) {
struct context *ctx = userdata;
ctx->client = client;
switch (state) {
case AVAHI_CLIENT_S_RUNNING:
register_stuff(ctx);
break;
case AVAHI_CLIENT_S_COLLISION:
case AVAHI_CLIENT_S_REGISTERING:
if (ctx->group)
avahi_entry_group_reset(ctx->group);
break;
case AVAHI_CLIENT_FAILURE:
if (avahi_client_errno(client) == AVAHI_ERR_DISCONNECTED) {
int error;
avahi_client_free(ctx->client);
ctx->client = NULL;
ctx->group = NULL;
/* Reconnect to the server */
if (!(ctx->client = avahi_client_new(
avahi_threaded_poll_get(ctx->threaded_poll),
AVAHI_CLIENT_NO_FAIL,
client_callback,
ctx,
&error))) {
rs_log_crit("Failed to contact server: %s\n", avahi_strerror(error));
avahi_threaded_poll_quit(ctx->threaded_poll);
}
} else {
rs_log_crit("Client failure: %s\n", avahi_strerror(avahi_client_errno(client)));
avahi_threaded_poll_quit(ctx->threaded_poll);
}
break;
case AVAHI_CLIENT_CONNECTING:
;
}
}
/* register a distcc service in DNS-SD/mDNS with the given port, number of CPUs, and maximum concurrent jobs */
void* dcc_zeroconf_register(uint16_t port, int n_cpus, int n_jobs) {
struct context *ctx = NULL;
char service[256] = "distcc@";
int error;
ctx = malloc(sizeof(struct context));
assert(ctx);
ctx->client = NULL;
ctx->group = NULL;
ctx->threaded_poll = NULL;
ctx->port = port;
ctx->n_cpus = n_cpus;
ctx->n_jobs = n_jobs;
/* Prepare service name */
gethostname(service+7, sizeof(service)-8);
service[sizeof(service)-1] = 0;
ctx->name = strdup(service);
assert(ctx->name);
if (!(ctx->threaded_poll = avahi_threaded_poll_new())) {
rs_log_crit("Failed to create event loop object.\n");
goto fail;
}
if (!(ctx->client = avahi_client_new(avahi_threaded_poll_get(ctx->threaded_poll), AVAHI_CLIENT_NO_FAIL, client_callback, ctx, &error))) {
rs_log_crit("Failed to create client object: %s\n", avahi_strerror(avahi_client_errno(ctx->client)));
goto fail;
}
/* Create the mDNS event handler */
if (avahi_threaded_poll_start(ctx->threaded_poll) < 0) {
rs_log_crit("Failed to create thread.\n");
goto fail;
}
return ctx;
fail:
if (ctx)
dcc_zeroconf_unregister(ctx);
return NULL;
}
/* Unregister this server from DNS-SD/mDNS */
int dcc_zeroconf_unregister(void *u) {
struct context *ctx = u;
if (ctx->threaded_poll)
avahi_threaded_poll_stop(ctx->threaded_poll);
if (ctx->client)
avahi_client_free(ctx->client);
if (ctx->threaded_poll)
avahi_threaded_poll_free(ctx->threaded_poll);
avahi_free(ctx->name);
free(ctx);
return 0;
}
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