[3882] | 1 | //proto.c: |
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| 2 | |
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| 3 | /* |
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| 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2010 |
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| 5 | * |
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| 6 | * This file is part of libroar a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * libroar is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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| 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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| 23 | * |
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| 24 | * NOTE for everyone want's to change something and send patches: |
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| 25 | * read README and HACKING! There a addition information on |
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| 26 | * the license of this document you need to read before you send |
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| 27 | * any patches. |
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| 28 | * |
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| 29 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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| 30 | * or libpulse*: |
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| 31 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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| 32 | * and are therefore GPL. Because of this it may be illigal to use |
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| 33 | * them with any software that uses libesd, libartsc or libpulse*. |
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| 34 | */ |
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| 35 | |
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| 36 | #include "libroar.h" |
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| 37 | |
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[3887] | 38 | #define _ROAR_MESS_BUF_LEN_V0 (1 /* version */ + 1 /* cmd */ + 2 /* stream */ + 4 /* pos */ + 2 /* datalen */) |
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| 39 | #define _ROAR_MESS_BUF_LEN_V1 (1 /* version */ + 1 /* cmd */ + 2 /* stream */ + 4 /* pos */ + 2 /* datalen */ + \ |
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| 40 | 1 /* flags */) |
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| 41 | #define _ROAR_MESS_BUF_LEN_V2 (1 /* version */ + 1 /* cmd */ + 2 /* stream */ + 8 /* pos */ + 2 /* datalen */ + \ |
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| 42 | 4 /* flags */ + 2 /* seq */) |
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| 43 | #define _ROAR_MESS_BUF_LEN _ROAR_MESS_BUF_LEN_V0 |
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| 44 | #define _ROAR_MESS_BUF_LEN_MAX ROAR_MAX3(_ROAR_MESS_BUF_LEN_V0, _ROAR_MESS_BUF_LEN_V1, _ROAR_MESS_BUF_LEN_V2) |
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| 45 | |
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| 46 | #define _ROAR_MESS_CRC_LEN_V0 0 /* No CRC */ |
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| 47 | #define _ROAR_MESS_CRC_LEN_V1 1 |
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| 48 | #define _ROAR_MESS_CRC_LEN_V2 4 |
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| 49 | #define _ROAR_MESS_CRC_LEN_MAX ROAR_MAX3(_ROAR_MESS_CRC_LEN_V0, _ROAR_MESS_CRC_LEN_V1, _ROAR_MESS_CRC_LEN_V2) |
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| 50 | |
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[3882] | 51 | int roar_send_message (struct roar_connection * con, struct roar_message * mes, char * data) { |
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| 52 | struct roar_vio_calls * vio; |
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| 53 | |
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| 54 | if ( (vio = roar_get_connection_vio2(con)) == NULL ) |
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| 55 | return -1; |
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| 56 | |
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| 57 | return roar_vsend_message(vio, mes, data); |
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| 58 | } |
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| 59 | |
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| 60 | int roar_vsend_message(struct roar_vio_calls * vio, struct roar_message * mes, char * data) { |
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[3887] | 61 | char buf[_ROAR_MESS_BUF_LEN_MAX]; |
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| 62 | char crc[_ROAR_MESS_CRC_LEN_MAX]; |
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| 63 | size_t headerlen = 0; |
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| 64 | size_t crclen = 0; |
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| 65 | char * bufptr; |
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[3882] | 66 | |
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| 67 | roar_errno = ROAR_ERROR_UNKNOWN; |
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| 68 | |
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| 69 | ROAR_DBG("roar_send_message(*): try to send an request..."); |
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| 70 | |
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[3887] | 71 | headerlen = _ROAR_MESS_BUF_LEN; |
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| 72 | |
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| 73 | mes->version = _ROAR_MESSAGE_VERSION; |
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| 74 | |
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| 75 | buf[0] = mes->version; // first byte is always the version. |
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[3882] | 76 | |
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[3887] | 77 | switch (mes->version) { |
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| 78 | case 0: |
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| 79 | buf[1] = (unsigned char) mes->cmd; |
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| 80 | *(uint16_t*)(buf+2) = ROAR_HOST2NET16(mes->stream); |
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| 81 | *(uint32_t*)(buf+4) = ROAR_HOST2NET32(mes->pos); |
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| 82 | *(uint16_t*)(buf+8) = ROAR_HOST2NET16(mes->datalen); |
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| 83 | headerlen = _ROAR_MESS_BUF_LEN_V0; |
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| 84 | break; |
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| 85 | case 1: |
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| 86 | buf[1] = (unsigned char) (mes->flags & 0xFF); |
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| 87 | buf[2] = (unsigned char) mes->cmd; |
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| 88 | // ... |
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| 89 | roar_errno = ROAR_ERROR_NOTSUP; |
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| 90 | return -1; |
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| 91 | break; |
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| 92 | case 2: |
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| 93 | headerlen = 16; |
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| 94 | buf[1] = (unsigned char) mes->cmd; |
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| 95 | *(uint16_t*)(buf+2) = ROAR_HOST2NET16(mes->stream); |
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| 96 | *(uint32_t*)(buf+4) = ROAR_HOST2NET32(mes->flags); |
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| 97 | if ( mes->flags & ROAR_MF_LSPOS ) { |
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| 98 | *(uint64_t*)(buf+8) = ROAR_HOST2NET16(mes->pos64); |
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| 99 | bufptr = buf+16; |
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| 100 | headerlen += 4; |
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| 101 | } else { |
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| 102 | *(uint32_t*)(buf+8) = ROAR_HOST2NET16(mes->pos); |
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| 103 | bufptr = buf+12; |
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| 104 | } |
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| 105 | *(uint16_t*)(bufptr+0) = ROAR_HOST2NET16(mes->datalen); |
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| 106 | *(uint16_t*)(bufptr+2) = ROAR_HOST2NET16(mes->seq); |
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| 107 | break; |
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| 108 | default: |
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| 109 | roar_errno = ROAR_ERROR_NOTSUP; |
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| 110 | return -1; |
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| 111 | } |
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| 112 | |
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| 113 | if ( roar_vio_write(vio, buf, headerlen) != headerlen ) { |
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[3882] | 114 | roar_errno = ROAR_ERROR_PIPE; |
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| 115 | return -1; |
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| 116 | } |
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| 117 | |
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| 118 | if ( mes->datalen != 0 ) { |
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| 119 | if ( roar_vio_write(vio, data == NULL ? mes->data : data, mes->datalen) != mes->datalen ) { |
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| 120 | roar_errno = ROAR_ERROR_PIPE; |
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| 121 | return -1; |
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| 122 | } |
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| 123 | } |
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| 124 | |
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[3887] | 125 | if ( crclen != 0 ) { |
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| 126 | if ( roar_vio_write(vio, crc, crclen) != crclen ) { |
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| 127 | roar_errno = ROAR_ERROR_PIPE; |
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| 128 | return -1; |
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| 129 | } |
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| 130 | } |
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| 131 | |
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[3882] | 132 | roar_errno = ROAR_ERROR_NONE; |
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| 133 | |
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| 134 | ROAR_DBG("roar_send_message(*) = 0"); |
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| 135 | return 0; |
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| 136 | } |
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| 137 | |
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| 138 | int roar_recv_message (struct roar_connection * con, struct roar_message * mes, char ** data) { |
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| 139 | struct roar_vio_calls * vio; |
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| 140 | |
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| 141 | if ( (vio = roar_get_connection_vio2(con)) == NULL ) |
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| 142 | return -1; |
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| 143 | |
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| 144 | return roar_vrecv_message(vio, mes, data); |
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| 145 | } |
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| 146 | |
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| 147 | int roar_vrecv_message(struct roar_vio_calls * vio, struct roar_message * mes, char ** data) { |
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[3887] | 148 | // TODO: add CRC support. |
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| 149 | char buf[_ROAR_MESS_BUF_LEN_MAX]; |
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| 150 | // char crc[_ROAR_MESS_CRC_LEN_MAX]; |
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| 151 | size_t headerlen = 0; |
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| 152 | // size_t crclen = 0; |
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| 153 | size_t needlen; |
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| 154 | char * bufptr; |
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[3882] | 155 | |
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| 156 | roar_errno = ROAR_ERROR_UNKNOWN; |
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| 157 | |
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| 158 | ROAR_DBG("roar_recv_message(*): try to get a response form the server..."); |
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| 159 | |
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| 160 | if ( mes == NULL ) |
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| 161 | return -1; |
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| 162 | |
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| 163 | if ( data != NULL ) |
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| 164 | *data = NULL; |
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| 165 | |
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| 166 | memset(mes, 0, sizeof(struct roar_message)); |
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| 167 | |
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[3887] | 168 | if ( roar_vio_read(vio, buf, _ROAR_MESS_BUF_LEN_V0) != _ROAR_MESS_BUF_LEN_V0 ) { |
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[3882] | 169 | roar_errno = ROAR_ERROR_PROTO; |
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| 170 | return -1; |
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| 171 | } |
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| 172 | |
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| 173 | ROAR_DBG("roar_recv_message(*): Got a header"); |
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| 174 | |
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[3887] | 175 | mes->version = buf[0]; |
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| 176 | headerlen = _ROAR_MESS_BUF_LEN_V0; |
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| 177 | |
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| 178 | switch (mes->version) { |
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| 179 | case 0: |
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| 180 | // we already have all data, so create the struct |
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| 181 | mes->cmd = (unsigned char)buf[1]; |
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| 182 | mes->stream = ROAR_NET2HOST16(*(uint16_t*)(buf+2)); |
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| 183 | mes->pos = ROAR_NET2HOST32(*(uint32_t*)(buf+4)); |
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| 184 | mes->datalen = ROAR_NET2HOST16(*(uint16_t*)(buf+8)); |
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| 185 | break; |
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| 186 | case 2: |
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| 187 | mes->cmd = (unsigned char)buf[1]; |
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| 188 | mes->stream = ROAR_NET2HOST16(*(uint16_t*)(buf+2)); |
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| 189 | mes->flags = ROAR_NET2HOST32(*(uint32_t*)(buf+4)); |
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| 190 | if ( mes->flags & ROAR_MF_LSPOS ) { |
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| 191 | headerlen = 20; |
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| 192 | } else { |
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| 193 | headerlen = 16; |
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| 194 | } |
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| 195 | break; |
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| 196 | default: |
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| 197 | roar_errno = ROAR_ERROR_PROTO; |
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| 198 | return -1; |
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| 199 | break; |
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[3882] | 200 | } |
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| 201 | |
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[3887] | 202 | // check specal case where headerlen < _ROAR_MESS_BUF_LEN_V0, this means that we need to put |
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| 203 | // some data we read as header into the data part of the message. |
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| 204 | if ( headerlen > _ROAR_MESS_BUF_LEN_V0 ) { |
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| 205 | needlen = headerlen - _ROAR_MESS_BUF_LEN_V0; |
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| 206 | if ( roar_vio_read(vio, buf+_ROAR_MESS_BUF_LEN_V0, needlen) != (ssize_t)needlen ) { |
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| 207 | roar_errno = ROAR_ERROR_PROTO; |
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| 208 | return -1; |
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| 209 | } |
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| 210 | } |
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| 211 | |
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| 212 | switch (mes->version) { |
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| 213 | case 2: |
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| 214 | if ( mes->flags & ROAR_MF_LSPOS ) { |
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| 215 | mes->pos64 = ROAR_NET2HOST32(*(uint64_t*)(buf+8)); |
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| 216 | bufptr = buf+16; |
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| 217 | } else { |
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| 218 | mes->pos = ROAR_NET2HOST32(*(uint32_t*)(buf+8)); |
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| 219 | bufptr = buf+12; |
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| 220 | } |
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| 221 | mes->datalen = ROAR_NET2HOST16(*(uint16_t*)(bufptr+0)); |
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| 222 | mes->seq = ROAR_NET2HOST16(*(uint16_t*)(bufptr+1)); |
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| 223 | break; |
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| 224 | } |
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[3882] | 225 | |
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| 226 | if ( (int16_t)mes->stream == -1 ) |
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| 227 | mes->stream = -1; |
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| 228 | |
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| 229 | ROAR_DBG("roar_recv_message(*): command=%i(%s)", mes->cmd, |
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| 230 | mes->cmd == ROAR_CMD_OK ? "OK" : (mes->cmd == ROAR_CMD_ERROR ? "ERROR" : "UNKNOWN")); |
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| 231 | |
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[3887] | 232 | // Below we only have data handling, handling of header is finished: |
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| 233 | |
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[3882] | 234 | if ( mes->datalen == 0 ) { |
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| 235 | ROAR_DBG("roar_recv_message(*): no data in this pkg"); |
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| 236 | ROAR_DBG("roar_recv_message(*) = 0"); |
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| 237 | roar_errno = ROAR_ERROR_NONE; |
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| 238 | return 0; |
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| 239 | } |
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| 240 | |
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| 241 | if ( mes->datalen <= LIBROAR_BUFFER_MSGDATA ) { |
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| 242 | if ( roar_vio_read(vio, mes->data, mes->datalen) == mes->datalen ) { |
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| 243 | ROAR_DBG("roar_recv_message(*): Got data!"); |
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| 244 | ROAR_DBG("roar_recv_message(*) = 0"); |
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| 245 | roar_errno = ROAR_ERROR_NONE; |
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| 246 | return 0; |
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| 247 | } |
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| 248 | |
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| 249 | roar_errno = ROAR_ERROR_PIPE; |
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| 250 | return -1; |
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| 251 | } else { |
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| 252 | if ( data == NULL ) { |
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| 253 | roar_errno = ROAR_ERROR_MSGSIZE; |
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| 254 | return -1; |
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| 255 | } |
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| 256 | |
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| 257 | if ( (*data = malloc(mes->datalen)) == NULL ) { |
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| 258 | roar_errno = ROAR_ERROR_NOMEM; |
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| 259 | return -1; |
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| 260 | } |
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| 261 | |
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| 262 | if ( mes->datalen == 0 ) { |
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| 263 | roar_errno = ROAR_ERROR_NONE; |
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| 264 | return 0; |
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| 265 | } |
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| 266 | |
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| 267 | if ( roar_vio_read(vio, *data, mes->datalen) == mes->datalen ) { |
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| 268 | ROAR_DBG("roar_recv_message(*): Got data!"); |
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| 269 | ROAR_DBG("roar_recv_message(*) = 0"); |
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| 270 | roar_errno = ROAR_ERROR_NONE; |
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| 271 | return 0; |
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| 272 | } |
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| 273 | |
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| 274 | roar_errno = ROAR_ERROR_PIPE; |
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| 275 | return -1; |
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| 276 | } |
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| 277 | |
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| 278 | // what happened here? |
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| 279 | return -1; |
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| 280 | } |
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| 281 | |
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| 282 | int roar_req (struct roar_connection * con, struct roar_message * mes, char ** data) { |
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| 283 | struct roar_vio_calls * vio; |
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| 284 | |
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| 285 | if ( (vio = roar_get_connection_vio2(con)) == NULL ) |
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| 286 | return -1; |
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| 287 | |
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| 288 | return roar_vreq(vio, mes, data); |
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| 289 | } |
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| 290 | |
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| 291 | int roar_vreq (struct roar_vio_calls * vio, struct roar_message * mes, char ** data) { |
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| 292 | if ( roar_vsend_message(vio, mes, data ? *data : NULL) != 0 ) |
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| 293 | return -1; |
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| 294 | |
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[4439] | 295 | if ( data != NULL ) |
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[3882] | 296 | free(*data); |
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| 297 | |
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| 298 | roar_vio_sync(vio); // we need to do this becasue of ssl/compressed links |
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| 299 | |
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| 300 | return roar_vrecv_message(vio, mes, data); |
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| 301 | } |
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| 302 | |
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| 303 | //ll |
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