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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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412
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12 #define NGX_HTTP_REALIP_XREALIP 0
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13 #define NGX_HTTP_REALIP_XFWD 1
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14 #define NGX_HTTP_REALIP_HEADER 2
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15
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16
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122
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17 typedef struct {
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396
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18 in_addr_t mask;
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19 in_addr_t addr;
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122
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20 } ngx_http_realip_from_t;
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21
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22
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23 typedef struct {
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396
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24 ngx_array_t *from; /* array of ngx_http_realip_from_t */
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412
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25 ngx_uint_t type;
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26 ngx_uint_t hash;
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27 ngx_str_t header;
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122
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28 } ngx_http_realip_loc_conf_t;
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29
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30
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396
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31 typedef struct {
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32 ngx_connection_t *connection;
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33 in_addr_t addr;
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34 ngx_str_t addr_text;
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35 } ngx_http_realip_ctx_t;
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36
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37
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122
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38 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r);
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396
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39 static void ngx_http_realip_cleanup(void *data);
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122
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40 static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd,
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41 void *conf);
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412
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42 static char *ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
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122
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43 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf);
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44 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf,
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45 void *parent, void *child);
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230
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46 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf);
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122
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47
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48
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49 static ngx_command_t ngx_http_realip_commands[] = {
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50
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51 { ngx_string("set_real_ip_from"),
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52 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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53 ngx_http_realip_from,
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54 NGX_HTTP_LOC_CONF_OFFSET,
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55 0,
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56 NULL },
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57
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58 { ngx_string("real_ip_header"),
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59 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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412
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60 ngx_http_realip,
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122
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61 NGX_HTTP_LOC_CONF_OFFSET,
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412
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62 0,
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63 NULL },
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122
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64
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65 ngx_null_command
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66 };
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67
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68
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69
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216
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70 static ngx_http_module_t ngx_http_realip_module_ctx = {
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122
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71 NULL, /* preconfiguration */
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230
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72 ngx_http_realip_init, /* postconfiguration */
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122
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73
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74 NULL, /* create main configuration */
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75 NULL, /* init main configuration */
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76
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77 NULL, /* create server configuration */
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78 NULL, /* merge server configuration */
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79
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80 ngx_http_realip_create_loc_conf, /* create location configuration */
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81 ngx_http_realip_merge_loc_conf /* merge location configuration */
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82 };
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83
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84
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85 ngx_module_t ngx_http_realip_module = {
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86 NGX_MODULE_V1,
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87 &ngx_http_realip_module_ctx, /* module context */
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88 ngx_http_realip_commands, /* module directives */
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89 NGX_HTTP_MODULE, /* module type */
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90 NULL, /* init master */
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230
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91 NULL, /* init module */
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122
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92 NULL, /* init process */
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93 NULL, /* init thread */
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94 NULL, /* exit thread */
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95 NULL, /* exit process */
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96 NULL, /* exit master */
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97 NGX_MODULE_V1_PADDING
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98 };
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99
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100
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101 static ngx_int_t
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102 ngx_http_realip_handler(ngx_http_request_t *r)
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103 {
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104 u_char *ip, *p;
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105 size_t len;
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286
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106 in_addr_t addr;
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412
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107 ngx_uint_t i, hash;
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108 ngx_list_part_t *part;
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109 ngx_table_elt_t *header;
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122
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110 struct sockaddr_in *sin;
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396
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111 ngx_connection_t *c;
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112 ngx_pool_cleanup_t *cln;
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113 ngx_http_realip_ctx_t *ctx;
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122
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114 ngx_http_realip_from_t *from;
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115 ngx_http_realip_loc_conf_t *rlcf;
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116
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396
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117 ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module);
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118
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119 if (ctx) {
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272
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120 return NGX_DECLINED;
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122
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121 }
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122
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396
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123 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_realip_ctx_t));
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124 if (cln == NULL) {
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125 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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126 }
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127
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122
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128 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module);
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129
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130 if (rlcf->from == NULL) {
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272
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131 return NGX_DECLINED;
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122
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132 }
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133
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412
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134 switch (rlcf->type) {
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135
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136 case NGX_HTTP_REALIP_XREALIP:
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137
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122
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138 if (r->headers_in.x_real_ip == NULL) {
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272
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139 return NGX_DECLINED;
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122
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140 }
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141
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142 len = r->headers_in.x_real_ip->value.len;
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143 ip = r->headers_in.x_real_ip->value.data;
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144
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412
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145 break;
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146
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147 case NGX_HTTP_REALIP_XFWD:
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148
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122
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149 if (r->headers_in.x_forwarded_for == NULL) {
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272
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150 return NGX_DECLINED;
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122
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151 }
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152
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153 len = r->headers_in.x_forwarded_for->value.len;
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154 ip = r->headers_in.x_forwarded_for->value.data;
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155
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286
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156 for (p = ip + len - 1; p > ip; p--) {
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122
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157 if (*p == ' ' || *p == ',') {
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286
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158 p++;
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159 len -= p - ip;
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160 ip = p;
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161 break;
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122
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162 }
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163 }
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412
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164
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165 break;
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166
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167 default: /* NGX_HTTP_REALIP_HEADER */
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168
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169 part = &r->headers_in.headers.part;
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170 header = part->elts;
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171
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172 hash = rlcf->hash;
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173 len = rlcf->header.len;
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174 p = rlcf->header.data;
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175
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176 for (i = 0; /* void */ ; i++) {
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177
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178 if (i >= part->nelts) {
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179 if (part->next == NULL) {
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180 break;
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181 }
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182
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183 part = part->next;
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184 header = part->elts;
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185 i = 0;
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186 }
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187
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188 if (hash == header[i].hash
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189 && len == header[i].key.len
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190 && ngx_strncmp(p, header[i].lowcase_key, len) == 0)
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191 {
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192 len = header[i].value.len;
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193 ip = header[i].value.data;
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194
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195 goto found;
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196 }
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197 }
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198
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199 return NGX_DECLINED;
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122
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200 }
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201
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412
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202 found:
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203
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396
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204 c = r->connection;
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205
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206 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "realip: \"%s\"", ip);
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286
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207
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122
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208 /* AF_INET only */
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209
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448
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210 if (r->connection->sockaddr->sa_family != AF_INET) {
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211 return NGX_DECLINED;
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212 }
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213
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396
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214 sin = (struct sockaddr_in *) c->sockaddr;
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122
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215
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216 from = rlcf->from->elts;
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217 for (i = 0; i < rlcf->from->nelts; i++) {
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218
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396
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219 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
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122
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220 "realip: %08XD %08XD %08XD",
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221 sin->sin_addr.s_addr, from[i].mask, from[i].addr);
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222
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223 if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) {
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224
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396
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225 ctx = cln->data;
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226
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227 ngx_http_set_ctx(r, ctx, ngx_http_realip_module);
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286
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228
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229 addr = inet_addr((char *) ip);
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230
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231 if (addr == INADDR_NONE) {
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232 return NGX_DECLINED;
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233 }
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122
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234
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396
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235 p = ngx_pnalloc(c->pool, len);
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286
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236 if (p == NULL) {
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237 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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238 }
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122
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239
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286
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240 ngx_memcpy(p, ip, len);
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241
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396
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242 cln->handler = ngx_http_realip_cleanup;
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243
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244 ctx->connection = c;
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245 ctx->addr = sin->sin_addr.s_addr;
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246 ctx->addr_text = c->addr_text;
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247
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286
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248 sin->sin_addr.s_addr = addr;
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249
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396
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250 c->addr_text.len = len;
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251 c->addr_text.data = p;
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122
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252
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272
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253 return NGX_DECLINED;
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122
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254 }
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255 }
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256
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272
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257 return NGX_DECLINED;
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122
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258 }
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259
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260
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396
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261 static void
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262 ngx_http_realip_cleanup(void *data)
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263 {
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264 ngx_http_realip_ctx_t *ctx = data;
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265
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266 ngx_connection_t *c;
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267 struct sockaddr_in *sin;
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268
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269 c = ctx->connection;
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270
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271 sin = (struct sockaddr_in *) c->sockaddr;
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272 sin->sin_addr.s_addr = ctx->addr;
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273
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274 c->addr_text = ctx->addr_text;
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275 }
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276
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277
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122
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278 static char *
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279 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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280 {
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281 ngx_http_realip_loc_conf_t *rlcf = conf;
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282
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412
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283 ngx_int_t rc;
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284 ngx_str_t *value;
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454
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285 ngx_cidr_t cidr;
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412
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286 ngx_http_realip_from_t *from;
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122
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287
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288 if (rlcf->from == NULL) {
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289 rlcf->from = ngx_array_create(cf->pool, 2,
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290 sizeof(ngx_http_realip_from_t));
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291 if (rlcf->from == NULL) {
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292 return NGX_CONF_ERROR;
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293 }
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294 }
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295
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296 from = ngx_array_push(rlcf->from);
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297 if (from == NULL) {
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298 return NGX_CONF_ERROR;
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299 }
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300
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301 value = cf->args->elts;
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302
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454
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303 rc = ngx_ptocidr(&value[1], &cidr);
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326
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304
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305 if (rc == NGX_ERROR) {
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122
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306 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
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307 &value[1]);
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308 return NGX_CONF_ERROR;
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309 }
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310
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454
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311 if (cidr.family != AF_INET) {
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312 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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313 "\"realip_from\" supports IPv4 only");
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314 return NGX_CONF_ERROR;
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315 }
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316
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326
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317 if (rc == NGX_DONE) {
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318 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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319 "low address bits of %V are meaningless", &value[1]);
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320 }
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321
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454
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322 from->mask = cidr.u.in.mask;
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323 from->addr = cidr.u.in.addr;
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122
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324
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325 return NGX_CONF_OK;
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326 }
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327
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328
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412
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329 static char *
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330 ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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331 {
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332 ngx_http_realip_loc_conf_t *rlcf = conf;
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333
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334 ngx_str_t *value;
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335
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336 value = cf->args->elts;
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337
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338 if (ngx_strcmp(value[1].data, "X-Real-IP") == 0) {
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339 rlcf->type = NGX_HTTP_REALIP_XREALIP;
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340 return NGX_CONF_OK;
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341 }
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342
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343 if (ngx_strcmp(value[1].data, "X-Forwarded-For") == 0) {
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344 rlcf->type = NGX_HTTP_REALIP_XFWD;
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345 return NGX_CONF_OK;
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346 }
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347
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348 rlcf->type = NGX_HTTP_REALIP_HEADER;
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349 rlcf->hash = ngx_hash_strlow(value[1].data, value[1].data, value[1].len);
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350 rlcf->header = value[1];
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351
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352 return NGX_CONF_OK;
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353 }
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354
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355
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122
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356 static void *
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357 ngx_http_realip_create_loc_conf(ngx_conf_t *cf)
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358 {
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359 ngx_http_realip_loc_conf_t *conf;
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360
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361 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t));
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362 if (conf == NULL) {
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363 return NGX_CONF_ERROR;
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364 }
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365
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366 /*
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367 * set by ngx_pcalloc():
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368 *
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369 * conf->from = NULL;
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412
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370 * conf->hash = 0;
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371 * conf->header = { 0, NULL };
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122
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372 */
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373
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412
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374 conf->type = NGX_CONF_UNSET_UINT;
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122
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375
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376 return conf;
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377 }
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378
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379
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380 static char *
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381 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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382 {
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383 ngx_http_realip_loc_conf_t *prev = parent;
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384 ngx_http_realip_loc_conf_t *conf = child;
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385
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386 if (conf->from == NULL) {
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387 conf->from = prev->from;
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388 }
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389
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412
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390 ngx_conf_merge_uint_value(conf->type, prev->type, NGX_HTTP_REALIP_XREALIP);
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391
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392 if (conf->header.len == 0) {
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393 conf->hash = prev->hash;
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394 conf->header = prev->header;
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395 }
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122
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396
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397 return NGX_CONF_OK;
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398 }
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399
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400
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401 static ngx_int_t
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230
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402 ngx_http_realip_init(ngx_conf_t *cf)
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122
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403 {
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404 ngx_http_handler_pt *h;
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405 ngx_http_core_main_conf_t *cmcf;
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|
|
406
|
|
230
|
407 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
|
|
122
|
408
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|
|
409 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers);
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|
|
410 if (h == NULL) {
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|
|
411 return NGX_ERROR;
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|
|
412 }
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|
|
413
|
|
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414 *h = ngx_http_realip_handler;
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|
|
415
|
|
130
|
416 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
|
|
122
|
417 if (h == NULL) {
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|
|
418 return NGX_ERROR;
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|
|
419 }
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|
|
420
|
|
|
421 *h = ngx_http_realip_handler;
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|
|
422
|
|
|
423 return NGX_OK;
|
|
|
424 }
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