137 lines
4.2 KiB
C
137 lines
4.2 KiB
C
/*
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* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
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* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <pjlib-util/stun_simple.h>
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#include <pjlib-util/errno.h>
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#include <pj/pool.h>
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#include <pj/log.h>
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#include <pj/sock.h>
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#include <pj/os.h>
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#define THIS_FILE "stun_simple.c"
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PJ_DEF(pj_status_t) pjstun_create_bind_req( pj_pool_t *pool,
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void **msg, pj_size_t *len,
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pj_uint32_t id_hi,
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pj_uint32_t id_lo)
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{
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pjstun_msg_hdr *hdr;
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PJ_CHECK_STACK();
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hdr = PJ_POOL_ZALLOC_T(pool, pjstun_msg_hdr);
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if (!hdr)
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return PJ_ENOMEM;
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hdr->type = pj_htons(PJSTUN_BINDING_REQUEST);
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hdr->tsx[2] = pj_htonl(id_hi);
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hdr->tsx[3] = pj_htonl(id_lo);
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*msg = hdr;
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*len = sizeof(pjstun_msg_hdr);
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return PJ_SUCCESS;
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}
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PJ_DEF(pj_status_t) pjstun_parse_msg( void *buf, pj_size_t buf_len,
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pjstun_msg *msg)
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{
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pj_uint16_t msg_type, msg_len;
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char *p_attr;
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int attr_max_cnt = PJ_ARRAY_SIZE(msg->attr);
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PJ_CHECK_STACK();
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msg->hdr = (pjstun_msg_hdr*)buf;
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msg_type = pj_ntohs(msg->hdr->type);
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switch (msg_type) {
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case PJSTUN_BINDING_REQUEST:
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case PJSTUN_BINDING_RESPONSE:
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case PJSTUN_BINDING_ERROR_RESPONSE:
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case PJSTUN_SHARED_SECRET_REQUEST:
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case PJSTUN_SHARED_SECRET_RESPONSE:
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case PJSTUN_SHARED_SECRET_ERROR_RESPONSE:
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break;
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default:
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PJ_LOG(4,(THIS_FILE, "Error: unknown msg type %d", msg_type));
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return PJLIB_UTIL_ESTUNINMSGTYPE;
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}
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msg_len = pj_ntohs(msg->hdr->length);
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if (msg_len != buf_len - sizeof(pjstun_msg_hdr)) {
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PJ_LOG(4,(THIS_FILE, "Error: invalid msg_len %d (expecting %lu)",
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msg_len, (unsigned long)
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(buf_len - sizeof(pjstun_msg_hdr))));
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return PJLIB_UTIL_ESTUNINMSGLEN;
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}
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msg->attr_count = 0;
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p_attr = (char*)buf + sizeof(pjstun_msg_hdr);
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while (msg_len > 0 && msg->attr_count < attr_max_cnt) {
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pjstun_attr_hdr **attr = &msg->attr[msg->attr_count];
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pj_uint32_t len;
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pj_uint16_t attr_type;
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*attr = (pjstun_attr_hdr*)p_attr;
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len = pj_ntohs((pj_uint16_t) ((*attr)->length)) + sizeof(pjstun_attr_hdr);
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len = (len + 3) & ~3;
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if (msg_len < len) {
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PJ_LOG(4,(THIS_FILE, "Error: length mismatch in attr %d",
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msg->attr_count));
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return PJLIB_UTIL_ESTUNINATTRLEN;
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}
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attr_type = pj_ntohs((*attr)->type);
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if (attr_type > PJSTUN_ATTR_REFLECTED_FROM &&
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attr_type != PJSTUN_ATTR_XOR_MAPPED_ADDR)
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{
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PJ_LOG(5,(THIS_FILE, "Warning: unknown attr type %x in attr %d. "
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"Attribute was ignored.",
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attr_type, msg->attr_count));
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}
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msg_len = (pj_uint16_t)(msg_len - len);
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p_attr += len;
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++msg->attr_count;
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}
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if (msg->attr_count == attr_max_cnt) {
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PJ_LOG(4, (THIS_FILE, "Warning: max number attribute %d reached.",
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attr_max_cnt));
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}
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return PJ_SUCCESS;
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}
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PJ_DEF(void*) pjstun_msg_find_attr( pjstun_msg *msg, pjstun_attr_type t)
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{
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int i;
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PJ_CHECK_STACK();
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for (i=0; i<msg->attr_count; ++i) {
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pjstun_attr_hdr *attr = msg->attr[i];
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if (pj_ntohs(attr->type) == t)
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return attr;
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}
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return 0;
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}
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