src/protocols/bonjour/dns_sd.c

/*
 *  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 Library 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <string.h>

#include "dns_sd.h"
#include "bonjour.h"
#include "buddy.h"
#include "debug.h"

/* Private functions */

static sw_result HOWL_API
_publish_reply(sw_discovery discovery, sw_discovery_oid oid,
			   sw_discovery_publish_status status, sw_opaque extra)
{
	gaim_debug_warning("bonjour", "_publish_reply --> Start\n");

	/* Check the answer from the mDNS daemon */
	switch (status)
	{
		case SW_DISCOVERY_PUBLISH_STARTED :
			gaim_debug_info("bonjour", "_publish_reply --> Service started\n");
			break;
		case SW_DISCOVERY_PUBLISH_STOPPED :
			gaim_debug_info("bonjour", "_publish_reply --> Service stopped\n");
			break;
		case SW_DISCOVERY_PUBLISH_NAME_COLLISION :
			gaim_debug_info("bonjour", "_publish_reply --> Name collision\n");
			break;
		case SW_DISCOVERY_PUBLISH_INVALID :
			gaim_debug_info("bonjour", "_publish_reply --> Service invalid\n");
			break;
	}

	return SW_OKAY;
}

static sw_result HOWL_API
_resolve_reply(sw_discovery discovery, sw_discovery_oid oid,
			   sw_uint32 interface_index, sw_const_string name,
			   sw_const_string type, sw_const_string domain,
			   sw_ipv4_address address, sw_port port,
			   sw_octets text_record, sw_ulong text_record_len,
			   sw_opaque extra)
{
	BonjourBuddy *buddy;
	GaimAccount *account = (GaimAccount*)extra;
	gchar *txtvers = NULL;
	gchar *version = NULL;
	gchar *first = NULL;
	gchar *phsh = NULL;
	gchar *status = NULL;
	gchar *email = NULL;
	gchar *last = NULL;
	gchar *jid = NULL;
	gchar *AIM = NULL;
	gchar *vc = NULL;
	gchar *msg = NULL;
	gint address_length = 16;
	gchar *ip = NULL;
	sw_text_record_iterator iterator;
	char key[SW_TEXT_RECORD_MAX_LEN];
	char value[SW_TEXT_RECORD_MAX_LEN];
	sw_uint32 value_length;

	sw_discovery_cancel(discovery, oid);

	/* Get the ip as a string */
	ip = malloc(address_length);
	sw_ipv4_address_name(address, ip, address_length);

	/* Obtain the parameters from the text_record */
	if ((text_record_len > 0) && (text_record) && (*text_record != '\0'))
	{
		sw_text_record_iterator_init(&iterator, text_record, text_record_len);
		while (sw_text_record_iterator_next(iterator, key, (sw_octet *)value, &value_length) == SW_OKAY)
		{
			/* Compare the keys with the possible ones and save them on */
			/* the appropiate place of the buddy_list */
			if (strcmp(key, "txtvers") == 0) {
				txtvers = g_strdup(value);
			} else if (strcmp(key, "version") == 0) {
				version = g_strdup(value);
			} else if (strcmp(key, "1st") == 0) {
				first = g_strdup(value);
			} else if (strcmp(key, "status") == 0) {
				status = g_strdup(value);
			} else if (strcmp(key, "email") == 0) {
				email = g_strdup(value);
			} else if (strcmp(key, "last") == 0) {
				last = g_strdup(value);
			} else if (strcmp(key, "jid") == 0) {
				jid = g_strdup(value);
			} else if (strcmp(key, "AIM") == 0) {
				AIM = g_strdup(value);
			} else if (strcmp(key, "vc") == 0) {
				vc = g_strdup(value);
			} else if (strcmp(key, "phsh") == 0) {
				phsh = g_strdup(value);
			} else if (strcmp(key, "msg") == 0) {
				msg = g_strdup(value);
			}
		}
	}

	/* Put the parameters of the text_record in a buddy and add the buddy to */
	/* the buddy list */
	buddy = bonjour_buddy_new(name, first, port, phsh,
							  status, email, last, jid, AIM, vc, ip, msg);

	if (bonjour_buddy_check(buddy) == FALSE)
	{
		bonjour_buddy_delete(buddy);
		return SW_DISCOVERY_E_UNKNOWN;
	}

	/* Add or update the buddy in our buddy list */
	bonjour_buddy_add_to_gaim(account, buddy);

	/* Free all the temporal strings */
	g_free(txtvers);
	g_free(version);
	g_free(first);
	g_free(last);
	g_free(status);
	g_free(email);
	g_free(jid);
	g_free(AIM);
	g_free(vc);
	g_free(phsh);
	g_free(msg);

	return SW_OKAY;
}

static sw_result HOWL_API
_browser_reply(sw_discovery discovery, sw_discovery_oid oid,
			   sw_discovery_browse_status status,
			   sw_uint32 interface_index, sw_const_string name,
			   sw_const_string type, sw_const_string domain,
			   sw_opaque_t extra)
{
	sw_discovery_resolve_id rid;
	GaimAccount *account = (GaimAccount*)extra;
	GaimBuddy *gb = NULL;

	switch (status)
	{
		case SW_DISCOVERY_BROWSE_INVALID:
			gaim_debug_warning("bonjour", "_browser_reply --> Invalid\n");
			break;
		case SW_DISCOVERY_BROWSE_RELEASE:
			gaim_debug_warning("bonjour", "_browser_reply --> Release\n");
			break;
		case SW_DISCOVERY_BROWSE_ADD_DOMAIN:
			gaim_debug_warning("bonjour", "_browser_reply --> Add domain\n");
			break;
		case SW_DISCOVERY_BROWSE_ADD_DEFAULT_DOMAIN:
			gaim_debug_warning("bonjour", "_browser_reply --> Add default domain\n");
			break;
		case SW_DISCOVERY_BROWSE_REMOVE_DOMAIN:
			gaim_debug_warning("bonjour", "_browser_reply --> Remove domain\n");
			break;
		case SW_DISCOVERY_BROWSE_ADD_SERVICE:
			/* A new peer has joined the network and uses iChat bonjour */
			gaim_debug_info("bonjour", "_browser_reply --> Add service\n");
			if (g_ascii_strcasecmp(name, account->username) != 0)
			{
				if (sw_discovery_resolve(discovery, interface_index, name, type,
						domain, _resolve_reply, extra, &rid) != SW_OKAY)
				{
					gaim_debug_warning("bonjour", "_browser_reply --> Cannot send resolve\n");
				}
			}
			break;
		case SW_DISCOVERY_BROWSE_REMOVE_SERVICE:
			gaim_debug_info("bonjour", "_browser_reply --> Remove service\n");
			gb = gaim_find_buddy((GaimAccount*)extra, name);
			if (gb != NULL)
			{
				bonjour_buddy_delete(gb->proto_data);
				gaim_blist_remove_buddy(gb);
			}
			break;
		case SW_DISCOVERY_BROWSE_RESOLVED:
			gaim_debug_info("bonjour", "_browse_reply --> Resolved\n");
			break;
		default:
			break;
	}

	return SW_OKAY;
}

static int
_dns_sd_publish(BonjourDnsSd *data, PublishType type)
{
	sw_text_record dns_data;
	sw_result publish_result = SW_OKAY;
	char portstring[6];

	/* Fill the data for the service */
	if (sw_text_record_init(&dns_data) != SW_OKAY)
	{
		gaim_debug_error("bonjour", "Unable to initialize the data for the mDNS.\n");
		return -1;
	}

	/* Convert the port to a string */
	snprintf(portstring, sizeof(portstring), "%d", data->port_p2pj);

	/* Publish standard records */
	sw_text_record_add_key_and_string_value(dns_data, "txtvers", data->txtvers);
	sw_text_record_add_key_and_string_value(dns_data, "version", data->version);
	sw_text_record_add_key_and_string_value(dns_data, "1st", data->first);
	sw_text_record_add_key_and_string_value(dns_data, "last", data->last);
	sw_text_record_add_key_and_string_value(dns_data, "port.p2pj", portstring);
	sw_text_record_add_key_and_string_value(dns_data, "phsh", data->phsh);
	sw_text_record_add_key_and_string_value(dns_data, "status", data->status);
	sw_text_record_add_key_and_string_value(dns_data, "vc", data->vc);

	/* Publish extra records */
	if ((data->email != NULL) && (*data->email != '\0'))
		sw_text_record_add_key_and_string_value(dns_data, "email", data->email);

	if ((data->jid != NULL) && (*data->jid != '\0'))
		sw_text_record_add_key_and_string_value(dns_data, "jid", data->jid);

	if ((data->AIM != NULL) && (*data->AIM != '\0'))
		sw_text_record_add_key_and_string_value(dns_data, "AIM", data->AIM);

	if ((data->msg != NULL) && (*data->msg != '\0'))
		sw_text_record_add_key_and_string_value(dns_data, "msg", data->msg);

	/* Publish the service */
	switch (type)
	{
		case PUBLISH_START:
			publish_result = sw_discovery_publish(data->session, 0, data->name, ICHAT_SERVICE, NULL,
								NULL, data->port_p2pj, sw_text_record_bytes(dns_data), sw_text_record_len(dns_data),
								_publish_reply, NULL, &data->session_id);
			break;
		case PUBLISH_UPDATE:
			publish_result = sw_discovery_publish_update(data->session, data->session_id,
								sw_text_record_bytes(dns_data), sw_text_record_len(dns_data));
			break;
	}
	if (publish_result != SW_OKAY)
	{
		gaim_debug_error("bonjour", "Unable to publish or change the status of the _presence._tcp service.\n");
		return -1;
	}

	/* Free the memory used by temp data */
	sw_text_record_fina(dns_data);

	return 0;
}

static void
_dns_sd_handle_packets(gpointer data, gint source, GaimInputCondition condition)
{
	sw_discovery_read_socket((sw_discovery)data);
}

/* End private functions */

/**
 * Allocate space for the dns-sd data.
 */
BonjourDnsSd *
bonjour_dns_sd_new()
{
	BonjourDnsSd *data = g_new0(BonjourDnsSd, 1);

	return data;
}

/**
 * Deallocate the space of the dns-sd data.
 */
void
bonjour_dns_sd_free(BonjourDnsSd *data)
{
	g_free(data->first);
	g_free(data->last);
	g_free(data->email);
	g_free(data);
}

/**
 * Send a new dns-sd packet updating our status.
 */
void
bonjour_dns_sd_send_status(BonjourDnsSd *data, const char *status, const char *status_message)
{
	g_free(data->status);
	g_free(data->msg);

	data->status = g_strdup(status);
	data->msg = g_strdup(status_message);

	/* Update our text record with the new status */
	_dns_sd_publish(data, PUBLISH_UPDATE); /* <--We must control the errors */
}

/**
 * Advertise our presence within the dns-sd daemon and start browsing
 * for other bonjour peers.
 */
gboolean
bonjour_dns_sd_start(BonjourDnsSd *data)
{
	GaimAccount *account;
	GaimConnection *gc;
	gint dns_sd_socket;
	sw_discovery_oid session_id;

	account = data->account;
	gc = gaim_account_get_connection(account);

	/* Initialize the dns-sd data and session */
	if (sw_discovery_init(&data->session) != SW_OKAY)
	{
		gaim_debug_error("bonjour", "Unable to initialize an mDNS session.\n");

		/* In Avahi, sw_discovery_init frees data->session but doesn't clear it */
		data->session = NULL;

		return FALSE;
	}

	/* Publish our bonjour IM client at the mDNS daemon */
	_dns_sd_publish(data, PUBLISH_START); /* <--We must control the errors */

	/* Advise the daemon that we are waiting for connections */
	if (sw_discovery_browse(data->session, 0, ICHAT_SERVICE, NULL, _browser_reply,
			data->account, &session_id) != SW_OKAY)
	{
		gaim_debug_error("bonjour", "Unable to get service.");
		return FALSE;
	}

	/* Get the socket that communicates with the mDNS daemon and bind it to a */
	/* callback that will handle the dns_sd packets */
	dns_sd_socket = sw_discovery_socket(data->session);
	gc->inpa = gaim_input_add(dns_sd_socket, GAIM_INPUT_READ,
									_dns_sd_handle_packets, data->session);

	return TRUE;
}

/**
 * Unregister the "_presence._tcp" service at the mDNS daemon.
 */
void
bonjour_dns_sd_stop(BonjourDnsSd *data)
{
	GaimAccount *account;
	GaimConnection *gc;

	if (data->session == NULL)
		return;

	sw_discovery_cancel(data->session, data->session_id);

	account = data->account;
	gc = gaim_account_get_connection(account);
	gaim_input_remove(gc->inpa);

	g_free(data->session);
	data->session = NULL;
}