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1 | office | 1 | /** |
2 | * @file net_ipv4_addr_in_network.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 | * net.ipv4.addr_in_network(string addr, string net_addr, string net_prefix) |
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33 | * net.ipv4.addr_in_network(string addr, string cidr_net_addr) |
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34 | * net.ipv4.ifnot_addr_in_network(string addr, string net_addr, string net_prefix) |
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35 | * net.ipv4.ifnot_addr_in_network(string addr, string cidr_net_addr) |
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36 | * |
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37 | * Description: |
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38 | * Checks if two IPv4 addresses belong to the same subnet. |
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39 | * The prefix length is given either in the a separate argument or along with |
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40 | * the second address in CIDR notation (address/prefix). |
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41 | * This can be used to check whether an address belongs to a certain |
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42 | * subnet, hence the name. |
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43 | * |
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44 | * Variables: |
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45 | * (empty) - "true" if addresses belong to the same subnet, "false" if not |
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46 | */ |
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47 | |||
48 | #include <string.h> |
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49 | |||
50 | #include <misc/ipaddr.h> |
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51 | |||
52 | #include <ncd/module_common.h> |
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53 | |||
54 | #include <generated/blog_channel_ncd_net_ipv4_addr_in_network.h> |
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55 | |||
56 | struct instance { |
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57 | NCDModuleInst *i; |
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58 | int value; |
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59 | }; |
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60 | |||
61 | static void func_new_common (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params, int is_ifnot) |
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62 | { |
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63 | struct instance *o = vo; |
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64 | o->i = i; |
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65 | |||
66 | // read arguments |
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67 | NCDValRef arg_addr; |
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68 | NCDValRef arg_net_addr; |
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69 | NCDValRef arg_net_prefix = NCDVal_NewInvalid(); |
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70 | if (!NCDVal_ListRead(params->args, 2, &arg_addr, &arg_net_addr) && |
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71 | !NCDVal_ListRead(params->args, 3, &arg_addr, &arg_net_addr, &arg_net_prefix) |
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72 | ) { |
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73 | ModuleLog(o->i, BLOG_ERROR, "wrong arity"); |
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74 | goto fail0; |
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75 | } |
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76 | if (!NCDVal_IsString(arg_addr) || !NCDVal_IsString(arg_net_addr) || |
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77 | (!NCDVal_IsInvalid(arg_net_prefix) && !NCDVal_IsString(arg_net_prefix)) |
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78 | ) { |
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79 | ModuleLog(o->i, BLOG_ERROR, "wrong type"); |
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80 | goto fail0; |
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81 | } |
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82 | |||
83 | // parse addr |
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84 | uint32_t addr; |
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85 | if (!ipaddr_parse_ipv4_addr(NCDVal_StringMemRef(arg_addr), &addr)) { |
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86 | ModuleLog(o->i, BLOG_ERROR, "bad address"); |
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87 | goto fail0; |
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88 | } |
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89 | |||
90 | // parse network |
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91 | struct ipv4_ifaddr network; |
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92 | if (NCDVal_IsInvalid(arg_net_prefix)) { |
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93 | if (!ipaddr_parse_ipv4_ifaddr(NCDVal_StringMemRef(arg_net_addr), &network)) { |
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94 | ModuleLog(o->i, BLOG_ERROR, "bad network in CIDR notation"); |
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95 | goto fail0; |
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96 | } |
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97 | } else { |
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98 | if (!ipaddr_parse_ipv4_addr(NCDVal_StringMemRef(arg_net_addr), &network.addr)) { |
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99 | ModuleLog(o->i, BLOG_ERROR, "bad network address"); |
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100 | goto fail0; |
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101 | } |
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102 | if (!ipaddr_parse_ipv4_prefix(NCDVal_StringMemRef(arg_net_prefix), &network.prefix)) { |
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103 | ModuleLog(o->i, BLOG_ERROR, "bad network prefix"); |
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104 | goto fail0; |
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105 | } |
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106 | } |
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107 | |||
108 | // test |
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109 | o->value = ipaddr_ipv4_addrs_in_network(addr, network.addr, network.prefix); |
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110 | |||
111 | if (is_ifnot && o->value) { |
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112 | ModuleLog(o->i, BLOG_ERROR, "addresses belong to same subnet, not proceeding"); |
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113 | } |
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114 | |||
115 | // signal up |
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116 | if (!is_ifnot || !o->value) { |
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117 | NCDModuleInst_Backend_Up(o->i); |
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118 | } |
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119 | |||
120 | return; |
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121 | |||
122 | fail0: |
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123 | NCDModuleInst_Backend_DeadError(i); |
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124 | } |
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125 | |||
126 | static void func_new_normal (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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127 | { |
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128 | func_new_common(vo, i, params, 0); |
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129 | } |
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130 | |||
131 | static void func_new_ifnot (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params) |
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132 | { |
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133 | func_new_common(vo, i, params, 1); |
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134 | } |
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135 | |||
136 | static int func_getvar (void *vo, const char *name, NCDValMem *mem, NCDValRef *out) |
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137 | { |
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138 | struct instance *o = vo; |
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139 | |||
140 | if (!strcmp(name, "")) { |
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141 | *out = ncd_make_boolean(mem, o->value); |
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142 | return 1; |
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143 | } |
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144 | |||
145 | return 0; |
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146 | } |
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147 | |||
148 | static struct NCDModule modules[] = { |
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149 | { |
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150 | .type = "net.ipv4.addr_in_network", |
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151 | .func_new2 = func_new_normal, |
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152 | .func_getvar = func_getvar, |
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153 | .alloc_size = sizeof(struct instance) |
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154 | }, { |
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155 | .type = "ip_in_network", // compatibility name |
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156 | .func_new2 = func_new_normal, |
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157 | .func_getvar = func_getvar, |
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158 | .alloc_size = sizeof(struct instance) |
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159 | }, { |
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160 | .type = "net.ipv4.ifnot_addr_in_network", |
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161 | .func_new2 = func_new_ifnot, |
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162 | .func_getvar = func_getvar, |
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163 | .alloc_size = sizeof(struct instance) |
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164 | }, { |
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165 | .type = NULL |
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166 | } |
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167 | }; |
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168 | |||
169 | const struct NCDModuleGroup ncdmodule_net_ipv4_addr_in_network = { |
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170 | .modules = modules |
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171 | }; |