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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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396
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15 in_addr_t mask;
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16 in_addr_t addr;
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122
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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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396
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21 ngx_array_t *from; /* array of ngx_http_realip_from_t */
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22 ngx_uint_t xfwd;
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122
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23 } ngx_http_realip_loc_conf_t;
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24
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25
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396
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26 typedef struct {
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27 ngx_connection_t *connection;
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28 in_addr_t addr;
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29 ngx_str_t addr_text;
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30 } ngx_http_realip_ctx_t;
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31
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32
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122
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33 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r);
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396
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34 static void ngx_http_realip_cleanup(void *data);
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122
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35 static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd,
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36 void *conf);
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37 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf);
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38 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf,
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39 void *parent, void *child);
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230
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40 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf);
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122
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41
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42
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43 static ngx_conf_enum_t ngx_http_realip_header[] = {
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44 { ngx_string("X-Forwarded-For"), 1 },
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45 { ngx_string("X-Real-IP"), 0 },
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46 { ngx_null_string, 0 }
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47 };
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48
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49
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50 static ngx_command_t ngx_http_realip_commands[] = {
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51
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52 { ngx_string("set_real_ip_from"),
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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_http_realip_from,
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55 NGX_HTTP_LOC_CONF_OFFSET,
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56 0,
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57 NULL },
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58
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59 { ngx_string("real_ip_header"),
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60 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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61 ngx_conf_set_enum_slot,
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62 NGX_HTTP_LOC_CONF_OFFSET,
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63 offsetof(ngx_http_realip_loc_conf_t, xfwd),
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64 &ngx_http_realip_header },
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65
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66 ngx_null_command
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67 };
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68
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69
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70
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216
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71 static ngx_http_module_t ngx_http_realip_module_ctx = {
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122
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72 NULL, /* preconfiguration */
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230
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73 ngx_http_realip_init, /* postconfiguration */
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122
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74
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75 NULL, /* create main configuration */
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76 NULL, /* init main configuration */
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77
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78 NULL, /* create server configuration */
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79 NULL, /* merge server configuration */
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80
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81 ngx_http_realip_create_loc_conf, /* create location configuration */
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82 ngx_http_realip_merge_loc_conf /* merge location configuration */
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83 };
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84
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85
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86 ngx_module_t ngx_http_realip_module = {
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87 NGX_MODULE_V1,
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88 &ngx_http_realip_module_ctx, /* module context */
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89 ngx_http_realip_commands, /* module directives */
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90 NGX_HTTP_MODULE, /* module type */
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91 NULL, /* init master */
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230
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92 NULL, /* init module */
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122
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93 NULL, /* init process */
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94 NULL, /* init thread */
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95 NULL, /* exit thread */
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96 NULL, /* exit process */
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97 NULL, /* exit master */
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98 NGX_MODULE_V1_PADDING
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99 };
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100
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101
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102 static ngx_int_t
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103 ngx_http_realip_handler(ngx_http_request_t *r)
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104 {
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105 u_char *ip, *p;
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106 size_t len;
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286
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107 in_addr_t addr;
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122
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108 ngx_uint_t i;
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109 struct sockaddr_in *sin;
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396
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110 ngx_connection_t *c;
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111 ngx_pool_cleanup_t *cln;
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112 ngx_http_realip_ctx_t *ctx;
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122
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113 ngx_http_realip_from_t *from;
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114 ngx_http_realip_loc_conf_t *rlcf;
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115
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396
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116 ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module);
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117
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118 if (ctx) {
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272
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119 return NGX_DECLINED;
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122
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120 }
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121
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396
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122 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_realip_ctx_t));
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123 if (cln == NULL) {
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124 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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125 }
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126
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122
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127 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module);
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128
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129 if (rlcf->from == NULL) {
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272
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130 return NGX_DECLINED;
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122
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131 }
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132
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133 if (rlcf->xfwd == 0) {
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134 if (r->headers_in.x_real_ip == NULL) {
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272
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135 return NGX_DECLINED;
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122
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136 }
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137
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138 len = r->headers_in.x_real_ip->value.len;
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139 ip = r->headers_in.x_real_ip->value.data;
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140
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141 } else {
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142 if (r->headers_in.x_forwarded_for == NULL) {
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272
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143 return NGX_DECLINED;
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122
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144 }
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145
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146 len = r->headers_in.x_forwarded_for->value.len;
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147 ip = r->headers_in.x_forwarded_for->value.data;
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148
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286
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149 for (p = ip + len - 1; p > ip; p--) {
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122
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150 if (*p == ' ' || *p == ',') {
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286
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151 p++;
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152 len -= p - ip;
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153 ip = p;
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154 break;
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122
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155 }
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156 }
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157 }
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158
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159 c = r->connection;
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160
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161 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "realip: \"%s\"", ip);
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286
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162
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122
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163 /* AF_INET only */
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164
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165 sin = (struct sockaddr_in *) c->sockaddr;
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122
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166
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167 from = rlcf->from->elts;
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168 for (i = 0; i < rlcf->from->nelts; i++) {
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169
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170 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
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122
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171 "realip: %08XD %08XD %08XD",
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172 sin->sin_addr.s_addr, from[i].mask, from[i].addr);
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173
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174 if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) {
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175
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396
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176 ctx = cln->data;
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177
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178 ngx_http_set_ctx(r, ctx, ngx_http_realip_module);
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286
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179
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180 addr = inet_addr((char *) ip);
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181
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182 if (addr == INADDR_NONE) {
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183 return NGX_DECLINED;
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184 }
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185
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186 p = ngx_pnalloc(c->pool, len);
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286
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187 if (p == NULL) {
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188 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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189 }
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190
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286
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191 ngx_memcpy(p, ip, len);
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192
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193 cln->handler = ngx_http_realip_cleanup;
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194
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195 ctx->connection = c;
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196 ctx->addr = sin->sin_addr.s_addr;
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197 ctx->addr_text = c->addr_text;
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198
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199 sin->sin_addr.s_addr = addr;
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200
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201 c->addr_text.len = len;
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202 c->addr_text.data = p;
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203
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272
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204 return NGX_DECLINED;
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122
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205 }
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206 }
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207
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272
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208 return NGX_DECLINED;
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122
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209 }
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210
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211
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396
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212 static void
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213 ngx_http_realip_cleanup(void *data)
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214 {
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215 ngx_http_realip_ctx_t *ctx = data;
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216
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217 ngx_connection_t *c;
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218 struct sockaddr_in *sin;
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219
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220 c = ctx->connection;
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221
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222 sin = (struct sockaddr_in *) c->sockaddr;
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223 sin->sin_addr.s_addr = ctx->addr;
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224
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225 c->addr_text = ctx->addr_text;
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226 }
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227
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228
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122
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229 static char *
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230 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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231 {
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232 ngx_http_realip_loc_conf_t *rlcf = conf;
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233
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326
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234 ngx_int_t rc;
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235 ngx_str_t *value;
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236 ngx_inet_cidr_t in_cidr;
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237 ngx_http_realip_from_t *from;
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238
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239 if (rlcf->from == NULL) {
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240 rlcf->from = ngx_array_create(cf->pool, 2,
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241 sizeof(ngx_http_realip_from_t));
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242 if (rlcf->from == NULL) {
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243 return NGX_CONF_ERROR;
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244 }
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245 }
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246
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247 from = ngx_array_push(rlcf->from);
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248 if (from == NULL) {
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249 return NGX_CONF_ERROR;
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250 }
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251
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252 value = cf->args->elts;
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253
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254 from->addr = inet_addr((char *) value[1].data);
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255
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256 if (from->addr != INADDR_NONE) {
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257 from->mask = 0xffffffff;
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258
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259 return NGX_CONF_OK;
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260 }
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261
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326
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262 rc = ngx_ptocidr(&value[1], &in_cidr);
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263
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264 if (rc == NGX_ERROR) {
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122
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265 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
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266 &value[1]);
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267 return NGX_CONF_ERROR;
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268 }
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269
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326
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270 if (rc == NGX_DONE) {
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271 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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272 "low address bits of %V are meaningless", &value[1]);
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273 }
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274
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275 from->mask = in_cidr.mask;
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276 from->addr = in_cidr.addr;
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277
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278 return NGX_CONF_OK;
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279 }
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280
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281
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282 static void *
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283 ngx_http_realip_create_loc_conf(ngx_conf_t *cf)
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284 {
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285 ngx_http_realip_loc_conf_t *conf;
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286
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287 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t));
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288 if (conf == NULL) {
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289 return NGX_CONF_ERROR;
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290 }
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291
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292 /*
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293 * set by ngx_pcalloc():
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294 *
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295 * conf->from = NULL;
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296 */
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297
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298 conf->xfwd = NGX_CONF_UNSET_UINT;
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299
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300 return conf;
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301 }
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302
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303
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304 static char *
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305 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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306 {
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307 ngx_http_realip_loc_conf_t *prev = parent;
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308 ngx_http_realip_loc_conf_t *conf = child;
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309
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310 if (conf->from == NULL) {
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311 conf->from = prev->from;
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312 }
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313
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212
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314 ngx_conf_merge_uint_value(conf->xfwd, prev->xfwd, 0);
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122
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315
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316 return NGX_CONF_OK;
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317 }
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318
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319
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320 static ngx_int_t
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230
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321 ngx_http_realip_init(ngx_conf_t *cf)
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122
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322 {
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323 ngx_http_handler_pt *h;
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324 ngx_http_core_main_conf_t *cmcf;
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325
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230
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326 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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122
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327
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328 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers);
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329 if (h == NULL) {
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330 return NGX_ERROR;
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331 }
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332
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333 *h = ngx_http_realip_handler;
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334
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130
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335 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
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122
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336 if (h == NULL) {
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337 return NGX_ERROR;
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338 }
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339
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340 *h = ngx_http_realip_handler;
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341
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342 return NGX_OK;
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343 }
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