msg.c

Linux下的多协议即时通讯程序源代码

/**
 * @file msg.c Message functions
 *
 * purple
 *
 * Purple is the legal property of its developers, whose names are too numerous
 * to list here.  Please refer to the COPYRIGHT file distributed with this
 * source distribution.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include "msn.h"
#include "msg.h"

MsnMessage *
msn_message_new(MsnMsgType type)
{
	MsnMessage *msg;

	msg = g_new0(MsnMessage, 1);
	msg->type = type;

#ifdef MSN_DEBUG_MSG
	purple_debug_info("msn", "message new (%p)(%d)\n", msg, type);
#endif

	msg->attr_table = g_hash_table_new_full(g_str_hash, g_str_equal,
											g_free, g_free);

	msn_message_ref(msg);

	return msg;
}

void
msn_message_destroy(MsnMessage *msg)
{
	g_return_if_fail(msg != NULL);

	if (msg->ref_count > 0)
	{
		msn_message_unref(msg);

		return;
	}

#ifdef MSN_DEBUG_MSG
	purple_debug_info("msn", "message destroy (%p)\n", msg);
#endif

	if (msg->remote_user != NULL)
		g_free(msg->remote_user);

	if (msg->body != NULL)
		g_free(msg->body);

	if (msg->content_type != NULL)
		g_free(msg->content_type);

	if (msg->charset != NULL)
		g_free(msg->charset);

	g_hash_table_destroy(msg->attr_table);
	g_list_free(msg->attr_list);

	g_free(msg);
}

MsnMessage *
msn_message_ref(MsnMessage *msg)
{
	g_return_val_if_fail(msg != NULL, NULL);

	msg->ref_count++;

#ifdef MSN_DEBUG_MSG
	purple_debug_info("msn", "message ref (%p)[%d]\n", msg, msg->ref_count);
#endif

	return msg;
}

MsnMessage *
msn_message_unref(MsnMessage *msg)
{
	g_return_val_if_fail(msg != NULL, NULL);
	g_return_val_if_fail(msg->ref_count > 0, NULL);

	msg->ref_count--;

#ifdef MSN_DEBUG_MSG
	purple_debug_info("msn", "message unref (%p)[%d]\n", msg, msg->ref_count);
#endif

	if (msg->ref_count == 0)
	{
		msn_message_destroy(msg);

		return NULL;
	}

	return msg;
}

MsnMessage *
msn_message_new_plain(const char *message)
{
	MsnMessage *msg;
	char *message_cr;

	msg = msn_message_new(MSN_MSG_TEXT);
	msn_message_set_attr(msg, "User-Agent", PACKAGE_NAME "/" VERSION);
	msn_message_set_content_type(msg, "text/plain");
	msn_message_set_charset(msg, "UTF-8");
	msn_message_set_flag(msg, 'A');
	msn_message_set_attr(msg, "X-MMS-IM-Format",
						 "FN=MS%20Sans%20Serif; EF=; CO=0; PF=0");

	message_cr = purple_str_add_cr(message);
	msn_message_set_bin_data(msg, message_cr, strlen(message_cr));
	g_free(message_cr);

	return msg;
}

MsnMessage *
msn_message_new_msnslp(void)
{
	MsnMessage *msg;

	msg = msn_message_new(MSN_MSG_SLP);

	msn_message_set_attr(msg, "User-Agent", NULL);

	msg->msnslp_message = TRUE;

	msn_message_set_flag(msg, 'D');
	msn_message_set_content_type(msg, "application/x-msnmsgrp2p");

	return msg;
}

MsnMessage *
msn_message_new_nudge(void)
{
	MsnMessage *msg;

	msg = msn_message_new(MSN_MSG_NUDGE);
	msn_message_set_content_type(msg, "text/x-msnmsgr-datacast\r\n");
	msn_message_set_flag(msg, 'N');
	msn_message_set_attr(msg,"ID","1\r\n");

	return msg;
}

void
msn_message_parse_slp_body(MsnMessage *msg, const char *body, size_t len)
{
	MsnSlpHeader header;
	const char *tmp;
	int body_len;

	tmp = body;

	if (len < sizeof(header)) {
		g_return_if_reached();
	}

	/* Import the header. */
	memcpy(&header, tmp, sizeof(header));
	tmp += sizeof(header);

	msg->msnslp_header.session_id = GUINT32_FROM_LE(header.session_id);
	msg->msnslp_header.id         = GUINT32_FROM_LE(header.id);
	msg->msnslp_header.offset     = GUINT64_FROM_LE(header.offset);
	msg->msnslp_header.total_size = GUINT64_FROM_LE(header.total_size);
	msg->msnslp_header.length     = GUINT32_FROM_LE(header.length);
	msg->msnslp_header.flags      = GUINT32_FROM_LE(header.flags);
	msg->msnslp_header.ack_id     = GUINT32_FROM_LE(header.ack_id);
	msg->msnslp_header.ack_sub_id = GUINT32_FROM_LE(header.ack_sub_id);
	msg->msnslp_header.ack_size   = GUINT64_FROM_LE(header.ack_size);

	/* Import the body. */
	body_len = len - (tmp - body);
	/* msg->body_len = msg->msnslp_header.length; */

	if (body_len > 0) {
		msg->body_len = len - (tmp - body);
		msg->body = g_malloc0(msg->body_len + 1);
		memcpy(msg->body, tmp, msg->body_len);
		tmp += body_len;
	}
}

void
msn_message_parse_payload(MsnMessage *msg,
						  const char *payload, size_t payload_len)
{
	char *tmp_base, *tmp;
	const char *content_type;
	char *end;
	char **elems, **cur, **tokens;

	g_return_if_fail(payload != NULL);

	tmp_base = tmp = g_malloc0(payload_len + 1);
	memcpy(tmp_base, payload, payload_len);

	/* Parse the attributes. */
	end = strstr(tmp, "\r\n\r\n");
	/* TODO? some clients use \r delimiters instead of \r\n, the official client
	 * doesn't send such messages, but does handle receiving them. We'll just
	 * avoid crashing for now */
	if (end == NULL) {
		g_free(tmp_base);
		g_return_if_reached();
	}
	*end = '\0';

	elems = g_strsplit(tmp, "\r\n", 0);

	for (cur = elems; *cur != NULL; cur++)
	{
		const char *key, *value;

		tokens = g_strsplit(*cur, ": ", 2);

		key = tokens[0];
		value = tokens[1];

		if (!strcmp(key, "MIME-Version"))
		{
			g_strfreev(tokens);
			continue;
		}

		if (!strcmp(key, "Content-Type"))
		{
			char *charset, *c;

			if ((c = strchr(value, ';')) != NULL)
			{
				if ((charset = strchr(c, '=')) != NULL)
				{
					charset++;
					msn_message_set_charset(msg, charset);
				}

				*c = '\0';
			}

			msn_message_set_content_type(msg, value);
		}
		else
		{
			msn_message_set_attr(msg, key, value);
		}

		g_strfreev(tokens);
	}

	g_strfreev(elems);

	/* Proceed to the end of the "\r\n\r\n" */
	tmp = end + 4;

	/* Now we *should* be at the body. */
	content_type = msn_message_get_content_type(msg);

	if (content_type != NULL &&
		!strcmp(content_type, "application/x-msnmsgrp2p"))
	{
		MsnSlpHeader header;
		MsnSlpFooter footer;
		int body_len;

		if (payload_len - (tmp - tmp_base) < sizeof(header)) {
			g_free(tmp_base);
			g_return_if_reached();
		}

		msg->msnslp_message = TRUE;

		/* Import the header. */
		memcpy(&header, tmp, sizeof(header));
		tmp += sizeof(header);

		msg->msnslp_header.session_id = GUINT32_FROM_LE(header.session_id);
		msg->msnslp_header.id         = GUINT32_FROM_LE(header.id);
		msg->msnslp_header.offset     = GUINT64_FROM_LE(header.offset);
		msg->msnslp_header.total_size = GUINT64_FROM_LE(header.total_size);
		msg->msnslp_header.length     = GUINT32_FROM_LE(header.length);
		msg->msnslp_header.flags      = GUINT32_FROM_LE(header.flags);
		msg->msnslp_header.ack_id     = GUINT32_FROM_LE(header.ack_id);
		msg->msnslp_header.ack_sub_id = GUINT32_FROM_LE(header.ack_sub_id);
		msg->msnslp_header.ack_size   = GUINT64_FROM_LE(header.ack_size);

		body_len = payload_len - (tmp - tmp_base) - sizeof(footer);

		/* Import the body. */
		if (body_len > 0) {
			msg->body_len = body_len;
			msg->body = g_malloc0(msg->body_len + 1);
			memcpy(msg->body, tmp, msg->body_len);
			tmp += body_len;
		}

		/* Import the footer. */
		if (body_len >= 0) {
			memcpy(&footer, tmp, sizeof(footer));
			tmp += sizeof(footer);
			msg->msnslp_footer.value = GUINT32_FROM_BE(footer.value);
		}
	}
	else
	{
		if (payload_len - (tmp - tmp_base) > 0) {
			msg->body_len = payload_len - (tmp - tmp_base);
			msg->body = g_malloc0(msg->body_len + 1);
			memcpy(msg->body, tmp, msg->body_len);
		}
	}

	g_free(tmp_base);
}

MsnMessage *
msn_message_new_from_cmd(MsnSession *session, MsnCommand *cmd)
{
	MsnMessage *msg;

	g_return_val_if_fail(cmd != NULL, NULL);

	msg = msn_message_new(MSN_MSG_UNKNOWN);

	msg->remote_user = g_strdup(cmd->params[0]);
	/* msg->size = atoi(cmd->params[2]); */
	msg->cmd = cmd;

	return msg;
}

char *
msn_message_gen_slp_body(MsnMessage *msg, size_t *ret_size)
{
	MsnSlpHeader header;

	char *tmp, *base;
	const void *body;
	size_t len, body_len;

	g_return_val_if_fail(msg != NULL, NULL);

	len = MSN_BUF_LEN;

	base = tmp = g_malloc(len + 1);

	body = msn_message_get_bin_data(msg, &body_len);

	header.session_id = GUINT32_TO_LE(msg->msnslp_header.session_id);
	header.id         = GUINT32_TO_LE(msg->msnslp_header.id);
	header.offset     = GUINT64_TO_LE(msg->msnslp_header.offset);
	header.total_size = GUINT64_TO_LE(msg->msnslp_header.total_size);
	header.length     = GUINT32_TO_LE(msg->msnslp_header.length);
	header.flags      = GUINT32_TO_LE(msg->msnslp_header.flags);
	header.ack_id     = GUINT32_TO_LE(msg->msnslp_header.ack_id);
	header.ack_sub_id = GUINT32_TO_LE(msg->msnslp_header.ack_sub_id);
	header.ack_size   = GUINT64_TO_LE(msg->msnslp_header.ack_size);

	memcpy(tmp, &header, 48);
	tmp += 48;

	if (body != NULL)
	{
		memcpy(tmp, body, body_len);
		tmp += body_len;
	}

	if (ret_size != NULL)
		*ret_size = tmp - base;

	return base;