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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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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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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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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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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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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76 | |
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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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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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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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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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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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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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168 | if ( roar_vio_read(vio, buf, _ROAR_MESS_BUF_LEN_V0) != _ROAR_MESS_BUF_LEN_V0 ) { |
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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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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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200 | } |
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201 | |
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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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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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232 | // Below we only have data handling, handling of header is finished: |
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233 | |
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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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295 | if ( data != NULL ) |
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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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