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1 | office | 1 | /** |
2 | * @file netmask.c |
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3 | * @author Ambroz Bizjak <ambrop7@gmail.com> |
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4 | * |
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5 | * @section LICENSE |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * 3. Neither the name of the author nor the |
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15 | * names of its contributors may be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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20 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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21 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
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22 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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23 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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24 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | * |
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29 | * @section DESCRIPTION |
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30 | * |
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31 | * Synopsis: |
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32 | * ipv4_prefix_to_mask(string prefix) |
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33 | * |
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34 | * Variables: |
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35 | * string (empty) - prefix, converted to dotted decimal format without leading |
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36 | * zeros |
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37 | * |
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38 | * Synopsis: |
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39 | * ipv4_mask_to_prefix(string mask) |
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40 | * |
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41 | * Variables: |
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42 | * string (empty) - mask, converted to prefix length |
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43 | * |
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44 | * Synopsis: |
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45 | * ipv4_net_from_addr_and_prefix(string addr, string prefix) |
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46 | * |
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47 | * Variables: |
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48 | * string (empty) - network part of the address, according to given prefix |
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49 | * length, in dotted decimal format without leading zeros |
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50 | */ |
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51 | |||
52 | #include <stdlib.h> |
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53 | #include <string.h> |
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54 | #include <stdio.h> |
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55 | #include <inttypes.h> |
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56 | |||
57 | #include <misc/ipaddr.h> |
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58 | #include <misc/parse_number.h> |
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59 | |||
60 | #include <ncd/module_common.h> |
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61 | |||
62 | #include <generated/blog_channel_ncd_netmask.h> |
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63 | |||
64 | struct addr_instance { |
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65 | NCDModuleInst *i; |
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66 | uint32_t addr; |
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67 | }; |
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68 | |||
69 | struct prefix_instance { |
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70 | NCDModuleInst *i; |
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71 | int prefix; |
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72 | }; |
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73 | |||
74 | static void addr_func_init_templ (void *vo, NCDModuleInst *i, uint32_t addr) |
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75 | { |
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76 | struct addr_instance *o = vo; |
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77 | o->i = i; |
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78 | |||
79 | // remember address |
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80 | o->addr = addr; |
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81 | |||
82 | // signal up |
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83 | NCDModuleInst_Backend_Up(i); |
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84 | } |
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85 | |||
86 | static void prefix_to_mask_func_init (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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87 | { |
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88 | // read arguments |
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89 | NCDValRef prefix_arg; |
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90 | if (!NCDVal_ListRead(params->args, 1, &prefix_arg)) { |
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91 | ModuleLog(i, BLOG_ERROR, "wrong arity"); |
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92 | goto fail0; |
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93 | } |
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94 | if (!NCDVal_IsString(prefix_arg)) { |
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95 | ModuleLog(i, BLOG_ERROR, "wrong type"); |
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96 | goto fail0; |
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97 | } |
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98 | |||
99 | // parse prefix |
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100 | int prefix; |
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101 | if (!ipaddr_parse_ipv4_prefix(NCDVal_StringMemRef(prefix_arg), &prefix)) { |
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102 | ModuleLog(i, BLOG_ERROR, "bad prefix"); |
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103 | goto fail0; |
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104 | } |
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105 | |||
106 | // make mask |
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107 | uint32_t mask = ipaddr_ipv4_mask_from_prefix(prefix); |
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108 | |||
109 | addr_func_init_templ(vo, i, mask); |
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110 | return; |
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111 | |||
112 | fail0: |
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113 | NCDModuleInst_Backend_DeadError(i); |
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114 | } |
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115 | |||
116 | static void ipv4_net_from_addr_and_prefix_func_init (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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117 | { |
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118 | // read arguments |
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119 | NCDValRef addr_arg; |
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120 | NCDValRef prefix_arg; |
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121 | if (!NCDVal_ListRead(params->args, 2, &addr_arg, &prefix_arg)) { |
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122 | ModuleLog(i, BLOG_ERROR, "wrong arity"); |
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123 | goto fail0; |
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124 | } |
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125 | if (!NCDVal_IsString(addr_arg) || !NCDVal_IsString(prefix_arg)) { |
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126 | ModuleLog(i, BLOG_ERROR, "wrong type"); |
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127 | goto fail0; |
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128 | } |
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129 | |||
130 | // parse addr |
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131 | uint32_t addr; |
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132 | if (!ipaddr_parse_ipv4_addr(NCDVal_StringMemRef(addr_arg), &addr)) { |
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133 | ModuleLog(i, BLOG_ERROR, "bad addr"); |
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134 | goto fail0; |
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135 | } |
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136 | |||
137 | // parse prefix |
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138 | int prefix; |
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139 | if (!ipaddr_parse_ipv4_prefix(NCDVal_StringMemRef(prefix_arg), &prefix)) { |
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140 | ModuleLog(i, BLOG_ERROR, "bad prefix"); |
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141 | goto fail0; |
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142 | } |
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143 | |||
144 | // make network |
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145 | uint32_t network = (addr & ipaddr_ipv4_mask_from_prefix(prefix)); |
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146 | |||
147 | addr_func_init_templ(vo, i, network); |
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148 | return; |
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149 | |||
150 | fail0: |
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151 | NCDModuleInst_Backend_DeadError(i); |
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152 | } |
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153 | |||
154 | static void addr_func_die (void *vo) |
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155 | { |
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156 | struct addr_instance *o = vo; |
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157 | |||
158 | NCDModuleInst_Backend_Dead(o->i); |
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159 | } |
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160 | |||
161 | static int addr_func_getvar2 (void *vo, NCD_string_id_t name, NCDValMem *mem, NCDValRef *out) |
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162 | { |
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163 | struct addr_instance *o = vo; |
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164 | |||
165 | if (name == NCD_STRING_EMPTY) { |
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166 | char buf[IPADDR_PRINT_MAX]; |
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167 | ipaddr_print_addr(o->addr, buf); |
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168 | |||
169 | *out = NCDVal_NewString(mem, buf); |
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170 | return 1; |
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171 | } |
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172 | |||
173 | return 0; |
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174 | } |
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175 | |||
176 | static void mask_to_prefix_func_init (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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177 | { |
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178 | struct prefix_instance *o = vo; |
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179 | o->i = i; |
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180 | |||
181 | // read arguments |
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182 | NCDValRef mask_arg; |
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183 | if (!NCDVal_ListRead(params->args, 1, &mask_arg)) { |
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184 | ModuleLog(i, BLOG_ERROR, "wrong arity"); |
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185 | goto fail0; |
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186 | } |
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187 | if (!NCDVal_IsString(mask_arg)) { |
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188 | ModuleLog(i, BLOG_ERROR, "wrong type"); |
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189 | goto fail0; |
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190 | } |
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191 | |||
192 | // parse mask |
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193 | uint32_t mask; |
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194 | if (!ipaddr_parse_ipv4_addr(NCDVal_StringMemRef(mask_arg), &mask)) { |
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195 | ModuleLog(i, BLOG_ERROR, "bad mask"); |
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196 | goto fail0; |
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197 | } |
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198 | |||
199 | // build prefix |
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200 | if (!ipaddr_ipv4_prefix_from_mask(mask, &o->prefix)) { |
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201 | ModuleLog(i, BLOG_ERROR, "bad mask"); |
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202 | goto fail0; |
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203 | } |
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204 | |||
205 | // signal up |
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206 | NCDModuleInst_Backend_Up(i); |
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207 | return; |
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208 | |||
209 | fail0: |
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210 | NCDModuleInst_Backend_DeadError(i); |
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211 | } |
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212 | |||
213 | static void prefix_func_die (void *vo) |
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214 | { |
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215 | struct prefix_instance *o = vo; |
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216 | |||
217 | NCDModuleInst_Backend_Dead(o->i); |
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218 | } |
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219 | |||
220 | static int prefix_func_getvar2 (void *vo, NCD_string_id_t name, NCDValMem *mem, NCDValRef *out) |
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221 | { |
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222 | struct prefix_instance *o = vo; |
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223 | |||
224 | if (name == NCD_STRING_EMPTY) { |
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225 | char buf[6]; |
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226 | sprintf(buf, "%d", o->prefix); |
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227 | |||
228 | *out = NCDVal_NewString(mem, buf); |
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229 | return 1; |
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230 | } |
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231 | |||
232 | return 0; |
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233 | } |
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234 | |||
235 | static struct NCDModule modules[] = { |
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236 | { |
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237 | .type = "ipv4_prefix_to_mask", |
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238 | .func_new2 = prefix_to_mask_func_init, |
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239 | .func_die = addr_func_die, |
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240 | .func_getvar2 = addr_func_getvar2, |
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241 | .alloc_size = sizeof(struct addr_instance) |
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242 | }, { |
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243 | .type = "ipv4_mask_to_prefix", |
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244 | .func_new2 = mask_to_prefix_func_init, |
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245 | .func_die = prefix_func_die, |
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246 | .func_getvar2 = prefix_func_getvar2, |
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247 | .alloc_size = sizeof(struct prefix_instance) |
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248 | }, { |
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249 | .type = "ipv4_net_from_addr_and_prefix", |
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250 | .func_new2 = ipv4_net_from_addr_and_prefix_func_init, |
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251 | .func_die = addr_func_die, |
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252 | .func_getvar2 = addr_func_getvar2, |
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253 | .alloc_size = sizeof(struct addr_instance) |
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254 | }, { |
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255 | .type = NULL |
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256 | } |
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257 | }; |
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258 | |||
259 | const struct NCDModuleGroup ncdmodule_netmask = { |
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260 | .modules = modules |
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261 | }; |