| /* $Id$ |
| * |
| */ |
| #include <pj/stun.h> |
| #include <pj/pool.h> |
| #include <pj/log.h> |
| #include <pj/sock.h> |
| #include <pj/os.h> |
| |
| #define THIS_FILE "stun" |
| |
| PJ_DEF(pj_status_t) pj_stun_create_bind_req( pj_pool_t *pool, |
| void **msg, pj_size_t *len, |
| pj_uint32_t id_hi, |
| pj_uint32_t id_lo) |
| { |
| pj_stun_msg_hdr *hdr; |
| |
| PJ_CHECK_STACK(); |
| |
| PJ_LOG(5,(THIS_FILE, "pj_stun_create_bind_req")); |
| |
| hdr = pj_pool_calloc(pool, 1, sizeof(pj_stun_msg_hdr)); |
| if (!hdr) { |
| PJ_LOG(5,(THIS_FILE, "Error allocating memory!")); |
| return -1; |
| } |
| |
| hdr->type = pj_htons(PJ_STUN_BINDING_REQUEST); |
| hdr->tsx[2] = pj_htonl(id_hi); |
| hdr->tsx[3] = pj_htonl(id_lo); |
| *msg = hdr; |
| *len = sizeof(pj_stun_msg_hdr); |
| |
| return 0; |
| } |
| |
| PJ_DEF(pj_status_t) pj_stun_parse_msg( void *buf, pj_size_t len, |
| pj_stun_msg *msg) |
| { |
| pj_uint16_t msg_type, msg_len; |
| char *p_attr; |
| |
| PJ_CHECK_STACK(); |
| |
| PJ_LOG(5,(THIS_FILE, "pj_stun_parse_msg %p, len=%d", buf, len)); |
| |
| msg->hdr = (pj_stun_msg_hdr*)buf; |
| msg_type = pj_ntohs(msg->hdr->type); |
| |
| switch (msg_type) { |
| case PJ_STUN_BINDING_REQUEST: |
| case PJ_STUN_BINDING_RESPONSE: |
| case PJ_STUN_BINDING_ERROR_RESPONSE: |
| case PJ_STUN_SHARED_SECRET_REQUEST: |
| case PJ_STUN_SHARED_SECRET_RESPONSE: |
| case PJ_STUN_SHARED_SECRET_ERROR_RESPONSE: |
| break; |
| default: |
| PJ_LOG(5,(THIS_FILE, "Error: unknown msg type %d", msg_type)); |
| return -1; |
| } |
| |
| msg_len = pj_ntohs(msg->hdr->length); |
| if (msg_len != len - sizeof(pj_stun_msg_hdr)) { |
| PJ_LOG(5,(THIS_FILE, "Error: invalid msg_len %d (expecting %d)", |
| msg_len, len - sizeof(pj_stun_msg_hdr))); |
| return -1; |
| } |
| |
| msg->attr_count = 0; |
| p_attr = (char*)buf + sizeof(pj_stun_msg_hdr); |
| |
| while (msg_len > 0) { |
| pj_stun_attr_hdr **attr = &msg->attr[msg->attr_count]; |
| pj_uint32_t len; |
| |
| *attr = (pj_stun_attr_hdr*)p_attr; |
| len = pj_ntohs((pj_uint16_t) ((*attr)->length)) + sizeof(pj_stun_attr_hdr); |
| |
| if (msg_len < len) { |
| PJ_LOG(5,(THIS_FILE, "Error: length mismatch in attr %d", |
| msg->attr_count)); |
| return -1; |
| } |
| |
| if (pj_ntohs((*attr)->type) > PJ_STUN_ATTR_REFLECTED_FORM) { |
| PJ_LOG(5,(THIS_FILE, "Error: invalid attr type %d in attr %d", |
| pj_ntohs((*attr)->type), msg->attr_count)); |
| return -1; |
| } |
| |
| msg_len = (pj_uint16_t)(msg_len - len); |
| p_attr += len; |
| ++msg->attr_count; |
| } |
| |
| return 0; |
| } |
| |
| PJ_DEF(void*) pj_stun_msg_find_attr( pj_stun_msg *msg, pj_stun_attr_type t) |
| { |
| int i; |
| |
| PJ_CHECK_STACK(); |
| |
| for (i=0; i<msg->attr_count; ++i) { |
| pj_stun_attr_hdr *attr = msg->attr[i]; |
| if (pj_ntohs(attr->type) == t) |
| return attr; |
| } |
| |
| return 0; |
| } |