224 lines
6.5 KiB
C
224 lines
6.5 KiB
C
/*
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* Copyright 2019 AT&T Intellectual Property
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* Copyright 2019 Nokia
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* This source code is part of the near-RT RIC (RAN Intelligent Controller)
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* platform project (RICP).
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*/
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#undef NDEBUG
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#include <assert.h>
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#include <asn1codec_utils.h>
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#include <constr_TYPE.h>
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#include <xer_encoder.h>
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/*
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* Printer for the e2ap pdu.
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* The string representation of the pdu stored in buf.
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*
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* Input:
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* pdu - the pdu to print.
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* buf_size - the size of the storage buffer.
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* buf - hold the string representation of the pdu.
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*/
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bool
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asn1_pdu_printer(E2AP_PDU_t const *pdu, size_t buf_size, char *buf)
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{
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bool rc = true;
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char *bufloc = 0;
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size_t sizeloc = 0;
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buf[0] = 0;
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FILE *stream = open_memstream(&bufloc, &sizeloc);
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errno = 0;
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if (asn_fprint(stream, &asn_DEF_E2AP_PDU, pdu)){
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snprintf(buf, buf_size, "#%s.%s - Failed to print %s, error = %d ", __FILE__, __func__, asn_DEF_E2AP_PDU.name, errno);
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strerror_r(errno, buf+strlen(buf), buf_size - strlen(buf));
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rc = false;
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} else {
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buf_size = buf_size > sizeloc ? sizeloc: buf_size -1;
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memcpy(buf, bufloc, buf_size);
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buf[buf_size] = 0;
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}
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fclose(stream);
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free(bufloc);
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return rc;
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}
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/*
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* XML Printer for the e2ap pdu.
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* The string representation of the pdu stored in buf.
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*
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* Input:
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* pdu - the pdu to print.
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* buf_size - the size of the storage buffer.
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* buf - hold the string representation of the pdu.
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*/
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bool
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asn1_pdu_xer_printer(E2AP_PDU_t const *pdu, size_t buf_size, char *buf)
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{
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bool rc = true;
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char *bufloc = 0;
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size_t sizeloc = 0;
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buf[0] = 0;
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FILE *stream = open_memstream(&bufloc, &sizeloc);
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errno = 0;
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if (xer_fprint(stream, &asn_DEF_E2AP_PDU, pdu)){
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snprintf(buf, buf_size, "#%s.%s - Failed to print %s, error = %d ", __FILE__, __func__, asn_DEF_E2AP_PDU.name, errno);
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strerror_r(errno, buf+strlen(buf), buf_size - strlen(buf));
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rc = false;
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} else {
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buf_size = buf_size > sizeloc ? sizeloc: buf_size -1;
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memcpy(buf, bufloc, buf_size);
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buf[buf_size] = 0;
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}
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fclose(stream);
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free(bufloc);
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return rc;
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}
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/*
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* Unpack the pdu from ASN.1 PER encoding.
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*
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* Input:
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* pdu - storage for unpacked pdu.
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* packed_buf_size - size of the encoded data.
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* packed_buf - storage of the packed pdu
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* err_buf_size - size of the err_buf which may hold the error string in case of
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* an error. err_buf - storage for the error string
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*
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* Return: true in case of success, false in case of failure.
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*/
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bool
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per_unpack_pdu(E2AP_PDU_t *pdu, size_t packed_buf_size, unsigned char* packed_buf,size_t err_buf_size, char* err_buf)
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{
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return unpack_pdu_aux(pdu, packed_buf_size, packed_buf,err_buf_size, err_buf,ATS_ALIGNED_BASIC_PER);
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}
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bool
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unpack_pdu_aux(E2AP_PDU_t *pdu, size_t packed_buf_size, unsigned char* packed_buf,size_t err_buf_size, char* err_buf,enum asn_transfer_syntax syntax)
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{
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char spec[256];
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size_t err_msg_size = err_buf_size;
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//ATS_BASIC_XER ATS_ALIGNED_BASIC_PER, ATS_UNALIGNED_BASIC_PER,ATS_ALIGNED_CANONICAL_PER
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errno = 0;
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asn_dec_rval_t rval =
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asn_decode(0,syntax , &asn_DEF_E2AP_PDU, (void **)&pdu, packed_buf, packed_buf_size);
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switch(rval.code) {
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case RC_OK:
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if (asn_check_constraints(&asn_DEF_E2AP_PDU, pdu,err_buf, &err_msg_size)){
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snprintf(spec, sizeof(spec), "#%s.%s - Constraint check failed: ", __FILE__, __func__);
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size_t spec_actual_size = strlen(spec);
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if (spec_actual_size + err_msg_size < err_buf_size){
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memmove(err_buf + spec_actual_size, err_buf, err_msg_size + 1);
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memcpy(err_buf, spec, spec_actual_size);
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}
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return false;
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}
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return true;
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break;
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case RC_WMORE:
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case RC_FAIL:
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default:
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break;
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}
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snprintf(err_buf, err_buf_size, "#%s.%s - Failed to decode %s (consumed %zu), error = %d ", __FILE__, __func__, asn_DEF_E2AP_PDU.name, rval.consumed, errno);
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strerror_r(errno, err_buf+strlen(err_buf), err_buf_size - strlen(err_buf));
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return false;
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}
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/*
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* Pack the pdu using ASN.1 PER encoding.
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*
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* Input:
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* pdu - the pdu to pack.
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* packed_buf_size - in: size of packed_buf; out: number of chars used.
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* packed_buf - storage for the packed pdu
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* err_buf_size - size of the err_buf which may hold the error string in case of
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* an error. err_buf - storage for the error string
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*
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* Return: true in case of success, false in case of failure.
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*/
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bool
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per_pack_pdu(E2AP_PDU_t *pdu, size_t *packed_buf_size, unsigned char* packed_buf,size_t err_buf_size, char* err_buf)
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{
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return pack_pdu_aux(pdu, packed_buf_size, packed_buf,err_buf_size, err_buf,ATS_ALIGNED_BASIC_PER);
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}
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bool
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pack_pdu_aux(E2AP_PDU_t *pdu, size_t *packed_buf_size, unsigned char* packed_buf,size_t err_buf_size, char* err_buf,enum asn_transfer_syntax syntax)
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{
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char spec[256];
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size_t err_msg_size = err_buf_size;
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if (asn_check_constraints(&asn_DEF_E2AP_PDU, pdu,err_buf, &err_msg_size)){
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snprintf(spec, sizeof(spec), "#%s.%s - Constraint check failed: ", __FILE__, __func__);
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size_t spec_actual_size = strlen(spec);
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if (spec_actual_size + err_msg_size < err_buf_size){
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memmove(err_buf + spec_actual_size, err_buf, err_msg_size + 1);
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memcpy(err_buf, spec, spec_actual_size);
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}
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return false;
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}
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errno = 0;
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asn_enc_rval_t res =
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asn_encode_to_buffer(0, syntax, &asn_DEF_E2AP_PDU, pdu, packed_buf, *packed_buf_size);
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if(res.encoded == -1) {
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snprintf(err_buf, err_buf_size, "#%s.%s - Failed to encode %s, error = %d ", __FILE__, __func__, asn_DEF_E2AP_PDU.name, errno);
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strerror_r(errno, err_buf+strlen(err_buf), err_buf_size - strlen(err_buf));
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return false;
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} else {
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/* Encoded successfully. */
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if (*packed_buf_size < res.encoded){
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snprintf(err_buf, err_buf_size, "#%s.%s - Encoded output of %s, is too big:%zu", __FILE__, __func__, asn_DEF_E2AP_PDU.name,res.encoded);
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return false;
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} else {
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*packed_buf_size = res.encoded;
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}
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}
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return true;
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}
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/*
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* Create a new pdu.
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* Abort the process on allocation failure.
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*/
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E2AP_PDU_t *new_pdu(size_t sz /*ignored (may be used for a custom allocator)*/)
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{
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E2AP_PDU_t *pdu = calloc(1, sizeof(E2AP_PDU_t));
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assert(pdu != 0);
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return pdu;
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}
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void delete_pdu(E2AP_PDU_t *pdu)
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{
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ASN_STRUCT_FREE(asn_DEF_E2AP_PDU, pdu);
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}
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