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