1 | //enumdev.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010-2012 |
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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 | // TODO: we should put all the data in one big alloced block. |
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39 | |
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40 | static int _test_server(struct roar_server * c, int flags) { |
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41 | struct roar_connection con; |
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42 | struct roar_server_info * info; |
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43 | int checked = 0; |
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44 | |
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45 | if ( c->server == NULL ) |
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46 | return -1; |
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47 | |
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48 | if ( flags & ROAR_ENUM_FLAG_NONBLOCK ) |
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49 | return 0; |
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50 | |
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51 | ROAR_DBG("_test_server(c=%p{.server='%s', ...}, flags=0x%.4X) = ?", c, c->server, flags); |
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52 | |
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53 | roar_libroar_nowarn(); |
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54 | if ( roar_connect(&con, c->server, 0, 0) == -1 ) { |
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55 | roar_libroar_warn(); |
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56 | return -1; |
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57 | } |
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58 | roar_libroar_warn(); |
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59 | |
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60 | ROAR_DBG("_test_server(c=%p{.server='%s', ...}, flags=0x%.4X) = ?", c, c->server, flags); |
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61 | |
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62 | if ( (flags & ROAR_ENUM_FLAG_DESC) || (flags & ROAR_ENUM_FLAG_LOCATION) ) { |
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63 | info = roar_server_info(&con); |
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64 | if ( info != NULL ) { |
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65 | checked = 1; |
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66 | if ( info->location != NULL ) |
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67 | c->location = roar_mm_strdup(info->location); |
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68 | |
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69 | if ( info->description != NULL ) |
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70 | c->description = roar_mm_strdup(info->description); |
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71 | |
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72 | roar_server_info_free(info); |
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73 | } |
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74 | } |
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75 | |
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76 | ROAR_DBG("_test_server(c=%p{.server='%s', ...}, flags=0x%.4X) = ?", c, c->server, flags); |
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77 | |
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78 | // make sure we get at least a NOOP from the server to detect protocol mismatch. |
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79 | if ( !checked ) { |
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80 | if ( roar_noop(&con) != 0 ) { |
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81 | roar_disconnect(&con); |
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82 | return -1; |
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83 | } |
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84 | } |
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85 | |
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86 | roar_disconnect(&con); |
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87 | |
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88 | ROAR_DBG("_test_server(c=%p{.server='%s', ...}, flags=0x%.4X) = 0", c, c->server, flags); |
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89 | return 0; |
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90 | } |
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91 | |
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92 | #define _add(x) if ( (x) != NULL ) servers[ret++] = roar_mm_strdup((x)) |
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93 | static ssize_t _esl_defaults(int flags, int dir, int socktype, char ** servers, size_t maxlen) { |
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94 | #ifdef ROAR_HAVE_LIBX11 |
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95 | struct roar_x11_connection * x11con; |
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96 | #endif |
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97 | ssize_t ret = 0; |
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98 | const char * new; |
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99 | char buf[1024]; |
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100 | #if !defined(ROAR_TARGET_WIN32) && !defined(ROAR_TARGET_MICROCONTROLLER) |
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101 | int i; |
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102 | #endif |
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103 | char * ssh_buf, * tmp; |
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104 | |
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105 | (void)flags, (void)dir, (void)socktype; |
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106 | |
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107 | if ( maxlen < 12 ) |
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108 | return -1; |
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109 | |
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110 | // We can not yet test if those servers are local or reachable via network so |
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111 | // we skip them for now. |
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112 | // TODO: test those servers. |
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113 | if ( !(flags & ROAR_ENUM_FLAG_LOCALONLY) ) { |
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114 | new = roar_libroar_get_server(); |
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115 | _add(new); |
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116 | |
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117 | new = getenv("ROAR_SERVER"); |
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118 | _add(new); |
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119 | |
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120 | #ifdef ROAR_HAVE_LIBX11 |
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121 | if ( (x11con = roar_x11_connect(NULL)) != NULL ) { |
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122 | new = roar_x11_get_prop(x11con, "ROAR_SERVER"); |
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123 | _add(new); |
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124 | roar_x11_disconnect(x11con); |
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125 | } |
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126 | #endif |
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127 | |
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128 | new = getenv("SSH_CLIENT"); |
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129 | if ( new == NULL ) |
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130 | new = getenv("SSH_CONNECTION"); |
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131 | |
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132 | if ( new != NULL ) { |
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133 | ssh_buf = roar_mm_strdup(new); |
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134 | if ( ssh_buf != NULL ) { |
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135 | tmp = strstr(ssh_buf, " "); |
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136 | if ( tmp == NULL ) { |
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137 | // invalid format. |
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138 | roar_mm_free(ssh_buf); |
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139 | } else { |
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140 | *tmp = 0; |
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141 | servers[ret++] = ssh_buf; |
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142 | } |
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143 | } |
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144 | } |
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145 | |
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146 | #if !defined(ROAR_TARGET_WIN32) && !defined(ROAR_TARGET_MICROCONTROLLER) |
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147 | if ( (i = readlink("/etc/roarserver", buf, sizeof(buf)-1)) != -1 ) { |
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148 | buf[i] = 0; |
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149 | _add(buf); |
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150 | } |
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151 | #endif |
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152 | } |
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153 | |
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154 | if ( (new = roar_env_get_home(0)) != NULL ) { |
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155 | snprintf(buf, sizeof(buf)-1, "%s/%s", new, ROAR_DEFAULT_SOCK_USER); |
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156 | buf[sizeof(buf)-1] = 0; |
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157 | _add(buf); |
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158 | } |
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159 | |
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160 | servers[ret++] = roar_mm_strdup(ROAR_DEFAULT_SOCK_GLOBAL); |
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161 | servers[ret++] = roar_mm_strdup(ROAR_DEFAULT_HOST); |
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162 | servers[ret++] = roar_mm_strdup("::" ROAR_DEFAULT_OBJECT); |
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163 | servers[ret++] = roar_mm_strdup("+abstract"); |
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164 | servers[ret++] = roar_mm_strdup("/tmp/muroard"); |
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165 | servers[ret++] = roar_mm_strdup("/dev/roar"); |
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166 | |
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167 | return ret; |
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168 | } |
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169 | |
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170 | static ssize_t _esl_slp(int flags, int dir, int socktype, char ** servers, size_t maxlen) { |
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171 | struct roar_libroar_config * config = roar_libroar_get_config(); |
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172 | struct roar_slp_cookie cookie; |
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173 | int offset; |
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174 | char * url; |
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175 | size_t i; |
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176 | ssize_t ret = 0; |
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177 | |
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178 | if ( config->workaround.workarounds & ROAR_LIBROAR_CONFIG_WAS_NO_SLP ) |
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179 | return 0; |
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180 | |
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181 | if ( roar_slp_cookie_init(&cookie, NULL) == -1 ) |
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182 | return -1; |
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183 | |
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184 | if ( roar_slp_search(&cookie, ROAR_SLP_URL_TYPE) == -1 ) |
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185 | return -1; |
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186 | |
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187 | if ( cookie.matchcount == 0 ) |
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188 | return -1; |
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189 | |
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190 | ROAR_DBG("_esl_slp(*): cookie.matchcount=%i", (int)cookie.matchcount); |
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191 | |
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192 | for (i = 0; i < (size_t)cookie.matchcount && (ssize_t)maxlen > ret; i++) { |
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193 | url = cookie.match[i].url; |
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194 | ROAR_DBG("_esl_slp(*): cookie.match[%i].url='%s'", (int)i, url); |
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195 | |
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196 | offset = 0; |
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197 | |
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198 | if ( !strncmp(url, ROAR_SLP_URL_TYPE "://", ROAR_SLP_URL_TYPE_LEN + 3) ) |
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199 | offset = ROAR_SLP_URL_TYPE_LEN + 3; |
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200 | |
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201 | ROAR_DBG("_esl_slp(*): url=%p, offset=%i", url, offset); |
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202 | url = &(url[offset]); |
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203 | ROAR_DBG("_esl_slp(*): url='%s'", url); |
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204 | |
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205 | if ( *url == 0 ) |
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206 | continue; |
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207 | |
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208 | _add(url); |
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209 | } |
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210 | |
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211 | return ret; |
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212 | } |
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213 | |
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214 | #ifdef ROAR_HAVE_FOPEN |
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215 | static ssize_t _esl_neighbours(int flags, int dir, int socktype, char ** servers, size_t maxlen) { |
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216 | ssize_t ret = 0; |
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217 | char buf[1024]; |
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218 | FILE * inp; |
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219 | size_t i; |
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220 | char * delm; |
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221 | const struct { |
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222 | const char * file; |
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223 | const char * suffix; |
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224 | const size_t skip; |
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225 | } *f, files[] = { |
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226 | #ifdef ROAR_PROC_NET_DECNET_NEIGH |
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227 | {ROAR_PROC_NET_DECNET_NEIGH, "::", 1}, |
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228 | #endif |
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229 | #ifdef ROAR_PROC_NET_ARP |
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230 | {ROAR_PROC_NET_ARP, NULL, 1}, |
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231 | #endif |
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232 | // {"/etc/hosts", NULL, 0}, |
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233 | {NULL, NULL, 0} |
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234 | }; |
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235 | |
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236 | (void)flags, (void)dir, (void)socktype; |
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237 | |
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238 | for (f = &(files[0]); f->file != NULL; f++) { |
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239 | if ( (inp = fopen(f->file, "r")) == NULL ) |
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240 | continue; |
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241 | |
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242 | for (i = 0; i < f->skip; i++) { |
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243 | if ( fgets(buf, sizeof(buf), inp) == NULL ) { |
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244 | // bad error... |
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245 | fclose(inp); |
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246 | return ret; |
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247 | } |
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248 | } |
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249 | |
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250 | while (ret < (ssize_t)maxlen && fgets(buf, sizeof(buf), inp) != NULL) { |
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251 | // skip comments and empty lions |
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252 | if ( buf[0] == '#' || buf[0] == '\0' ) |
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253 | continue; |
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254 | |
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255 | // ensure we have a tailing \0. |
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256 | buf[sizeof(buf)-1] = 0; |
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257 | |
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258 | delm = strstr(buf, " "); |
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259 | if ( delm == NULL ) |
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260 | delm = strstr(buf, "\t"); |
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261 | |
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262 | // does it look like a correctly formated lion? |
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263 | // we may remove this check or relax it later. |
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264 | if ( delm == NULL ) |
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265 | continue; |
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266 | |
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267 | *delm = 0; |
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268 | |
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269 | if ( f->suffix != NULL ) { |
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270 | if ( (roar_mm_strlen(buf) + roar_mm_strlen(f->suffix) + 1) > sizeof(buf) ) |
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271 | continue; |
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272 | |
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273 | roar_mm_strscat(buf, f->suffix); |
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274 | } |
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275 | |
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276 | // work around a bug in Linux kernel which always reports node 0.2 to be up. |
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277 | if ( !strcmp(buf, "0.2::") ) |
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278 | continue; |
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279 | |
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280 | _add(buf); |
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281 | } |
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282 | |
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283 | fclose(inp); |
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284 | if ( ret == (ssize_t)maxlen ) |
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285 | break; |
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286 | } |
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287 | |
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288 | return ret; |
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289 | } |
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290 | #endif |
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291 | |
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292 | struct locmed { |
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293 | int supflags; |
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294 | ssize_t (*func)(int flags, int dir, int socktype, char ** servers, size_t maxlen); |
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295 | }; |
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296 | |
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297 | static struct locmed _libroar_locmod[] = { |
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298 | {ROAR_ENUM_FLAG_NONBLOCK|ROAR_ENUM_FLAG_HARDNONBLOCK|ROAR_ENUM_FLAG_LOCALONLY, _esl_defaults}, |
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299 | {ROAR_ENUM_FLAG_NONE, _esl_slp}, |
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300 | #ifdef ROAR_HAVE_FOPEN |
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301 | {ROAR_ENUM_FLAG_NONBLOCK, _esl_neighbours} |
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302 | #endif |
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303 | }; |
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304 | |
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305 | struct roar_server * roar_enum_servers(int flags, int dir, int socktype) { |
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306 | struct roar_libroar_config * config = roar_libroar_get_config(); |
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307 | struct roar_server * ret = NULL; |
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308 | struct roar_server * c; |
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309 | char * servers[64]; |
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310 | size_t have = 1; |
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311 | size_t i, cp, unic; |
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312 | ssize_t r; |
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313 | int testflags; |
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314 | int is_uniq; |
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315 | |
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316 | flags |= config->serverflags; |
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317 | testflags = flags; |
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318 | |
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319 | if ( flags & ROAR_ENUM_FLAG_HARDNONBLOCK ) |
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320 | flags |= ROAR_ENUM_FLAG_NONBLOCK; |
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321 | |
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322 | if ( testflags & ROAR_ENUM_FLAG_DESC ) |
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323 | testflags -= ROAR_ENUM_FLAG_DESC; |
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324 | if ( testflags & ROAR_ENUM_FLAG_LOCATION ) |
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325 | testflags -= ROAR_ENUM_FLAG_LOCATION; |
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326 | |
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327 | for (i = 0; i < sizeof(_libroar_locmod)/sizeof(*_libroar_locmod); i++) { |
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328 | if ( (_libroar_locmod[i].supflags & testflags) == testflags ) { |
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329 | r = _libroar_locmod[i].func(flags, dir, socktype, &(servers[have-1]), (sizeof(servers)/sizeof(*servers)) - have); |
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330 | if ( r > 0 ) |
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331 | have += r; |
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332 | } |
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333 | } |
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334 | |
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335 | ret = roar_mm_malloc(have*sizeof(struct roar_server)); |
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336 | |
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337 | if (ret == NULL) |
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338 | return NULL; |
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339 | |
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340 | have--; |
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341 | |
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342 | for (i = cp = 0; i < have; i++) { |
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343 | c = &(ret[cp]); |
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344 | c->server = servers[i]; |
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345 | c->description = NULL; |
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346 | c->location = NULL; |
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347 | |
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348 | // uniq test: |
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349 | is_uniq = 1; |
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350 | for (unic = 0; unic < cp; unic++) |
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351 | if ( !strcmp(ret[unic].server, servers[i]) ) |
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352 | is_uniq = 0; |
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353 | |
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354 | if ( is_uniq && _test_server(c, flags) == 0 ) { |
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355 | cp++; |
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356 | } else { |
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357 | roar_mm_free(servers[i]); |
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358 | } |
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359 | } |
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360 | |
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361 | ret[cp].server = NULL; |
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362 | ret[cp].description = roar_mm_strdup("Default server"); |
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363 | ret[cp].location = NULL; |
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364 | |
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365 | return ret; |
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366 | } |
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367 | |
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368 | int roar_enum_servers_free(struct roar_server * servs) { |
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369 | struct roar_server * c; |
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370 | int i; |
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371 | |
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372 | if ( servs == NULL ) { |
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373 | roar_err_set(ROAR_ERROR_FAULT); |
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374 | return -1; |
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375 | } |
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376 | |
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377 | for (i = 0; (c = &(servs[i]))->server != NULL; i++) { |
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378 | roar_mm_free((void*)c->server); |
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379 | if ( c->description != NULL ) |
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380 | roar_mm_free((void*)c->description); |
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381 | if ( c->location != NULL ) |
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382 | roar_mm_free((void*)c->location); |
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383 | } |
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384 | |
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385 | if ( c->description != NULL ) |
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386 | roar_mm_free((void*)c->description); |
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387 | if ( c->location != NULL ) |
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388 | roar_mm_free((void*)c->location); |
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389 | |
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390 | roar_mm_free(servs); |
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391 | |
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392 | return 0; |
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393 | } |
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394 | |
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395 | ssize_t roar_enum_servers_num(struct roar_server * servs) { |
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396 | size_t ret; |
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397 | |
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398 | if ( servs == NULL ) { |
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399 | roar_err_set(ROAR_ERROR_FAULT); |
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400 | return -1; |
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401 | } |
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402 | |
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403 | for (ret = 0; servs[ret].server != NULL; ret++); |
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404 | |
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405 | return ret; |
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406 | } |
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407 | |
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408 | //ll |
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