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122
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10
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11
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12 /* AF_INET only */
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13
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14 typedef struct {
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15 in_addr_t mask;
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16 in_addr_t addr;
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17 } ngx_http_realip_from_t;
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18
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19
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20 typedef struct {
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21 ngx_array_t *from; /* array of ngx_http_realip_from_t */
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22
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23 ngx_uint_t xfwd;
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24 } ngx_http_realip_loc_conf_t;
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25
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26
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27 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r);
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28 static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd,
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29 void *conf);
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30 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf);
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31 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf,
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32 void *parent, void *child);
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33 static ngx_int_t ngx_http_realip_init(ngx_cycle_t *cycle);
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34
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35
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36 static ngx_conf_enum_t ngx_http_realip_header[] = {
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37 { ngx_string("X-Forwarded-For"), 1 },
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38 { ngx_string("X-Real-IP"), 0 },
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39 { ngx_null_string, 0 }
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40 };
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41
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42
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43 static ngx_command_t ngx_http_realip_commands[] = {
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44
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45 { ngx_string("set_real_ip_from"),
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46 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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47 ngx_http_realip_from,
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48 NGX_HTTP_LOC_CONF_OFFSET,
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49 0,
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50 NULL },
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51
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52 { ngx_string("real_ip_header"),
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53 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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54 ngx_conf_set_enum_slot,
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55 NGX_HTTP_LOC_CONF_OFFSET,
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56 offsetof(ngx_http_realip_loc_conf_t, xfwd),
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57 &ngx_http_realip_header },
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58
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59 ngx_null_command
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60 };
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61
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62
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63
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64 ngx_http_module_t ngx_http_realip_module_ctx = {
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65 NULL, /* preconfiguration */
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66 NULL, /* postconfiguration */
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67
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68 NULL, /* create main configuration */
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69 NULL, /* init main configuration */
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70
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71 NULL, /* create server configuration */
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72 NULL, /* merge server configuration */
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73
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74 ngx_http_realip_create_loc_conf, /* create location configuration */
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75 ngx_http_realip_merge_loc_conf /* merge location configuration */
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76 };
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77
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78
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79 ngx_module_t ngx_http_realip_module = {
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80 NGX_MODULE_V1,
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81 &ngx_http_realip_module_ctx, /* module context */
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82 ngx_http_realip_commands, /* module directives */
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83 NGX_HTTP_MODULE, /* module type */
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84 NULL, /* init master */
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85 ngx_http_realip_init, /* init module */
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86 NULL, /* init process */
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87 NULL, /* init thread */
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88 NULL, /* exit thread */
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89 NULL, /* exit process */
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90 NULL, /* exit master */
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91 NGX_MODULE_V1_PADDING
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92 };
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93
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94
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95 static ngx_int_t
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96 ngx_http_realip_handler(ngx_http_request_t *r)
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97 {
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98 u_char *ip, *p;
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99 size_t len;
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100 ngx_uint_t i;
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101 struct sockaddr_in *sin;
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102 ngx_http_realip_from_t *from;
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103 ngx_http_realip_loc_conf_t *rlcf;
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104
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105 if (r->realip_set) {
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106 return NGX_OK;
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107 }
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108
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109 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module);
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110
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111 if (rlcf->from == NULL) {
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112 return NGX_OK;
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113 }
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114
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115 if (rlcf->xfwd == 0) {
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116 if (r->headers_in.x_real_ip == NULL) {
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117 return NGX_OK;
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118 }
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119
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120 len = r->headers_in.x_real_ip->value.len;
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121 ip = r->headers_in.x_real_ip->value.data;
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122
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123 } else {
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124 if (r->headers_in.x_forwarded_for == NULL) {
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125 return NGX_OK;
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126 }
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127
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128 len = r->headers_in.x_forwarded_for->value.len;
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129 ip = r->headers_in.x_forwarded_for->value.data;
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130
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131 for (p = ip + len; p > ip; p--) {
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132 if (*p == ' ' || *p == ',') {
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133 p++;
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134 len -= p - ip;
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135 ip = p;
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136 break;
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137 }
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138 }
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139 }
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140
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141 /* AF_INET only */
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142
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143 sin = (struct sockaddr_in *) r->connection->sockaddr;
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144
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145 from = rlcf->from->elts;
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146 for (i = 0; i < rlcf->from->nelts; i++) {
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147
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148 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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149 "realip: %08XD %08XD %08XD",
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150 sin->sin_addr.s_addr, from[i].mask, from[i].addr);
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151
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152 if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) {
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153
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154 r->connection->addr_text.len = len;
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155 r->connection->addr_text.data = ip;
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156
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157 sin->sin_addr.s_addr = inet_addr((char *) ip);
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158
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159 r->realip_set = 1;
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160
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161 return NGX_OK;
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162 }
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163 }
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164
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165 return NGX_OK;
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166 }
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167
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168
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169 static char *
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170 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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171 {
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172 ngx_http_realip_loc_conf_t *rlcf = conf;
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173
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174 ngx_str_t *value;
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175 ngx_inet_cidr_t in_cidr;
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176 ngx_http_realip_from_t *from;
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177
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178 if (rlcf->from == NULL) {
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179 rlcf->from = ngx_array_create(cf->pool, 2,
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180 sizeof(ngx_http_realip_from_t));
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181 if (rlcf->from == NULL) {
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182 return NGX_CONF_ERROR;
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183 }
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184 }
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185
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186 from = ngx_array_push(rlcf->from);
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187 if (from == NULL) {
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188 return NGX_CONF_ERROR;
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189 }
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190
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191 value = cf->args->elts;
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192
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193 from->addr = inet_addr((char *) value[1].data);
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194
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195 if (from->addr != INADDR_NONE) {
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196 from->mask = 0xffffffff;
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197
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198 return NGX_CONF_OK;
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199 }
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200
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201 if (ngx_ptocidr(&value[1], &in_cidr) == NGX_ERROR) {
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202 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
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203 &value[1]);
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204 return NGX_CONF_ERROR;
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205 }
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206
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207 from->mask = in_cidr.mask;
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208 from->addr = in_cidr.addr;
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209
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210 return NGX_CONF_OK;
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211 }
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212
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213
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214 static void *
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215 ngx_http_realip_create_loc_conf(ngx_conf_t *cf)
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216 {
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217 ngx_http_realip_loc_conf_t *conf;
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218
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219 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t));
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220 if (conf == NULL) {
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221 return NGX_CONF_ERROR;
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222 }
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223
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224 /*
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225 * set by ngx_pcalloc():
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226 *
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227 * conf->from = NULL;
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228 */
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229
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230 conf->xfwd = NGX_CONF_UNSET_UINT;
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231
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232 return conf;
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233 }
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234
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235
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236 static char *
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237 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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238 {
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239 ngx_http_realip_loc_conf_t *prev = parent;
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240 ngx_http_realip_loc_conf_t *conf = child;
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241
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242 if (conf->from == NULL) {
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243 conf->from = prev->from;
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244 }
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245
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212
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246 ngx_conf_merge_uint_value(conf->xfwd, prev->xfwd, 0);
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122
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247
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248 return NGX_CONF_OK;
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249 }
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250
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251
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252 static ngx_int_t
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253 ngx_http_realip_init(ngx_cycle_t *cycle)
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254 {
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255 ngx_http_handler_pt *h;
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256 ngx_http_core_main_conf_t *cmcf;
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257
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258 cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module);
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259
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260 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers);
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261 if (h == NULL) {
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262 return NGX_ERROR;
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263 }
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264
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265 *h = ngx_http_realip_handler;
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266
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130
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267 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
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122
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268 if (h == NULL) {
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269 return NGX_ERROR;
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270 }
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271
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272 *h = ngx_http_realip_handler;
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273
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274 return NGX_OK;
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275 }
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