Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /* $Id$ */ |
| 2 | /* |
| 3 | * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| 4 | * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | #include <pjlib-util/stun_simple.h> |
| 21 | #include <pjlib-util/errno.h> |
| 22 | #include <pj/pool.h> |
| 23 | #include <pj/log.h> |
| 24 | #include <pj/sock.h> |
| 25 | #include <pj/os.h> |
| 26 | |
| 27 | #define THIS_FILE "stun_simple.c" |
| 28 | |
| 29 | PJ_DEF(pj_status_t) pjstun_create_bind_req( pj_pool_t *pool, |
| 30 | void **msg, pj_size_t *len, |
| 31 | pj_uint32_t id_hi, |
| 32 | pj_uint32_t id_lo) |
| 33 | { |
| 34 | pjstun_msg_hdr *hdr; |
| 35 | |
| 36 | PJ_CHECK_STACK(); |
| 37 | |
| 38 | |
| 39 | hdr = PJ_POOL_ZALLOC_T(pool, pjstun_msg_hdr); |
| 40 | if (!hdr) |
| 41 | return PJ_ENOMEM; |
| 42 | |
| 43 | hdr->type = pj_htons(PJSTUN_BINDING_REQUEST); |
| 44 | hdr->tsx[2] = pj_htonl(id_hi); |
| 45 | hdr->tsx[3] = pj_htonl(id_lo); |
| 46 | *msg = hdr; |
| 47 | *len = sizeof(pjstun_msg_hdr); |
| 48 | |
| 49 | return PJ_SUCCESS; |
| 50 | } |
| 51 | |
| 52 | PJ_DEF(pj_status_t) pjstun_parse_msg( void *buf, pj_size_t len, |
| 53 | pjstun_msg *msg) |
| 54 | { |
| 55 | pj_uint16_t msg_type, msg_len; |
| 56 | char *p_attr; |
| 57 | |
| 58 | PJ_CHECK_STACK(); |
| 59 | |
| 60 | msg->hdr = (pjstun_msg_hdr*)buf; |
| 61 | msg_type = pj_ntohs(msg->hdr->type); |
| 62 | |
| 63 | switch (msg_type) { |
| 64 | case PJSTUN_BINDING_REQUEST: |
| 65 | case PJSTUN_BINDING_RESPONSE: |
| 66 | case PJSTUN_BINDING_ERROR_RESPONSE: |
| 67 | case PJSTUN_SHARED_SECRET_REQUEST: |
| 68 | case PJSTUN_SHARED_SECRET_RESPONSE: |
| 69 | case PJSTUN_SHARED_SECRET_ERROR_RESPONSE: |
| 70 | break; |
| 71 | default: |
| 72 | PJ_LOG(4,(THIS_FILE, "Error: unknown msg type %d", msg_type)); |
| 73 | return PJLIB_UTIL_ESTUNINMSGTYPE; |
| 74 | } |
| 75 | |
| 76 | msg_len = pj_ntohs(msg->hdr->length); |
| 77 | if (msg_len != len - sizeof(pjstun_msg_hdr)) { |
| 78 | PJ_LOG(4,(THIS_FILE, "Error: invalid msg_len %d (expecting %d)", |
| 79 | msg_len, len - sizeof(pjstun_msg_hdr))); |
| 80 | return PJLIB_UTIL_ESTUNINMSGLEN; |
| 81 | } |
| 82 | |
| 83 | msg->attr_count = 0; |
| 84 | p_attr = (char*)buf + sizeof(pjstun_msg_hdr); |
| 85 | |
| 86 | while (msg_len > 0) { |
| 87 | pjstun_attr_hdr **attr = &msg->attr[msg->attr_count]; |
| 88 | pj_uint32_t len; |
| 89 | pj_uint16_t attr_type; |
| 90 | |
| 91 | *attr = (pjstun_attr_hdr*)p_attr; |
| 92 | len = pj_ntohs((pj_uint16_t) ((*attr)->length)) + sizeof(pjstun_attr_hdr); |
| 93 | len = (len + 3) & ~3; |
| 94 | |
| 95 | if (msg_len < len) { |
| 96 | PJ_LOG(4,(THIS_FILE, "Error: length mismatch in attr %d", |
| 97 | msg->attr_count)); |
| 98 | return PJLIB_UTIL_ESTUNINATTRLEN; |
| 99 | } |
| 100 | |
| 101 | attr_type = pj_ntohs((*attr)->type); |
| 102 | if (attr_type > PJSTUN_ATTR_REFLECTED_FROM && |
| 103 | attr_type != PJSTUN_ATTR_XOR_MAPPED_ADDR) |
| 104 | { |
| 105 | PJ_LOG(5,(THIS_FILE, "Warning: unknown attr type %x in attr %d. " |
| 106 | "Attribute was ignored.", |
| 107 | attr_type, msg->attr_count)); |
| 108 | } |
| 109 | |
| 110 | msg_len = (pj_uint16_t)(msg_len - len); |
| 111 | p_attr += len; |
| 112 | ++msg->attr_count; |
| 113 | } |
| 114 | |
| 115 | return PJ_SUCCESS; |
| 116 | } |
| 117 | |
| 118 | PJ_DEF(void*) pjstun_msg_find_attr( pjstun_msg *msg, pjstun_attr_type t) |
| 119 | { |
| 120 | int i; |
| 121 | |
| 122 | PJ_CHECK_STACK(); |
| 123 | |
| 124 | for (i=0; i<msg->attr_count; ++i) { |
| 125 | pjstun_attr_hdr *attr = msg->attr[i]; |
| 126 | if (pj_ntohs(attr->type) == t) |
| 127 | return attr; |
| 128 | } |
| 129 | |
| 130 | return 0; |
| 131 | } |