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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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540
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28 #if (NGX_HAVE_UNIX_DOMAIN)
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29 ngx_uint_t unixsock; /* unsigned unixsock:1; */
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30 #endif
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122
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31 } ngx_http_realip_loc_conf_t;
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32
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33
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396
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34 typedef struct {
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35 ngx_connection_t *connection;
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540
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36 struct sockaddr *sockaddr;
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37 socklen_t socklen;
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396
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38 ngx_str_t addr_text;
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39 } ngx_http_realip_ctx_t;
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40
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41
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122
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42 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r);
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540
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43 static ngx_int_t ngx_http_realip_set_addr(ngx_http_request_t *r, u_char *ip,
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44 size_t len);
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396
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45 static void ngx_http_realip_cleanup(void *data);
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122
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46 static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd,
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47 void *conf);
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412
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48 static char *ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
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122
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49 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf);
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50 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf,
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51 void *parent, void *child);
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230
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52 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf);
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122
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53
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54
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55 static ngx_command_t ngx_http_realip_commands[] = {
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56
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57 { ngx_string("set_real_ip_from"),
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58 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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59 ngx_http_realip_from,
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60 NGX_HTTP_LOC_CONF_OFFSET,
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61 0,
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62 NULL },
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63
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64 { ngx_string("real_ip_header"),
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65 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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412
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66 ngx_http_realip,
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122
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67 NGX_HTTP_LOC_CONF_OFFSET,
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412
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68 0,
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69 NULL },
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122
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70
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71 ngx_null_command
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72 };
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73
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74
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75
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216
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76 static ngx_http_module_t ngx_http_realip_module_ctx = {
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122
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77 NULL, /* preconfiguration */
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230
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78 ngx_http_realip_init, /* postconfiguration */
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122
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79
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80 NULL, /* create main configuration */
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81 NULL, /* init main configuration */
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82
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83 NULL, /* create server configuration */
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84 NULL, /* merge server configuration */
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85
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86 ngx_http_realip_create_loc_conf, /* create location configuration */
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87 ngx_http_realip_merge_loc_conf /* merge location configuration */
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88 };
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89
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90
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91 ngx_module_t ngx_http_realip_module = {
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92 NGX_MODULE_V1,
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93 &ngx_http_realip_module_ctx, /* module context */
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94 ngx_http_realip_commands, /* module directives */
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95 NGX_HTTP_MODULE, /* module type */
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96 NULL, /* init master */
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230
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97 NULL, /* init module */
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122
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98 NULL, /* init process */
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99 NULL, /* init thread */
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100 NULL, /* exit thread */
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101 NULL, /* exit process */
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102 NULL, /* exit master */
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103 NGX_MODULE_V1_PADDING
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104 };
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105
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106
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107 static ngx_int_t
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108 ngx_http_realip_handler(ngx_http_request_t *r)
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109 {
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110 u_char *ip, *p;
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111 size_t len;
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412
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112 ngx_uint_t i, hash;
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113 ngx_list_part_t *part;
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114 ngx_table_elt_t *header;
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122
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115 struct sockaddr_in *sin;
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396
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116 ngx_connection_t *c;
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117 ngx_http_realip_ctx_t *ctx;
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122
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118 ngx_http_realip_from_t *from;
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119 ngx_http_realip_loc_conf_t *rlcf;
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120
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396
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121 ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module);
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122
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123 if (ctx) {
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272
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124 return NGX_DECLINED;
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122
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125 }
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126
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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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542
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129 if (rlcf->from == NULL
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130 #if (NGX_HAVE_UNIX_DOMAIN)
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131 && !rlcf->unixsock
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132 #endif
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133 )
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134 {
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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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412
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138 switch (rlcf->type) {
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139
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140 case NGX_HTTP_REALIP_XREALIP:
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141
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122
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142 if (r->headers_in.x_real_ip == 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_real_ip->value.len;
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147 ip = r->headers_in.x_real_ip->value.data;
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148
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412
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149 break;
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150
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151 case NGX_HTTP_REALIP_XFWD:
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152
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122
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153 if (r->headers_in.x_forwarded_for == NULL) {
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272
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154 return NGX_DECLINED;
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122
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155 }
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156
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157 len = r->headers_in.x_forwarded_for->value.len;
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158 ip = r->headers_in.x_forwarded_for->value.data;
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159
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286
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160 for (p = ip + len - 1; p > ip; p--) {
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122
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161 if (*p == ' ' || *p == ',') {
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286
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162 p++;
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163 len -= p - ip;
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164 ip = p;
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165 break;
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122
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166 }
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167 }
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412
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168
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169 break;
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170
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171 default: /* NGX_HTTP_REALIP_HEADER */
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172
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173 part = &r->headers_in.headers.part;
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174 header = part->elts;
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175
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176 hash = rlcf->hash;
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177 len = rlcf->header.len;
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178 p = rlcf->header.data;
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179
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180 for (i = 0; /* void */ ; i++) {
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181
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182 if (i >= part->nelts) {
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183 if (part->next == NULL) {
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184 break;
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185 }
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186
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187 part = part->next;
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188 header = part->elts;
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189 i = 0;
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190 }
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191
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192 if (hash == header[i].hash
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193 && len == header[i].key.len
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194 && ngx_strncmp(p, header[i].lowcase_key, len) == 0)
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195 {
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196 len = header[i].value.len;
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197 ip = header[i].value.data;
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198
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199 goto found;
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200 }
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201 }
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202
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203 return NGX_DECLINED;
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122
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204 }
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205
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412
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206 found:
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207
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396
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208 c = r->connection;
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209
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210 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "realip: \"%s\"", ip);
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286
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211
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122
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212 /* AF_INET only */
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213
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540
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214 if (c->sockaddr->sa_family == AF_INET) {
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215 sin = (struct sockaddr_in *) c->sockaddr;
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216
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217 from = rlcf->from->elts;
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218 for (i = 0; i < rlcf->from->nelts; i++) {
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219
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220 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
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221 "realip: %08XD %08XD %08XD",
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222 sin->sin_addr.s_addr, from[i].mask, from[i].addr);
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223
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224 if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) {
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225 return ngx_http_realip_set_addr(r, ip, len);
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226 }
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227 }
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228 }
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229
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230 #if (NGX_HAVE_UNIX_DOMAIN)
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231
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232 if (c->sockaddr->sa_family == AF_UNIX && rlcf->unixsock) {
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233 return ngx_http_realip_set_addr(r, ip, len);
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448
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234 }
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235
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540
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236 #endif
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122
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237
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540
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238 return NGX_DECLINED;
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239 }
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122
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240
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241
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540
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242 static ngx_int_t
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243 ngx_http_realip_set_addr(ngx_http_request_t *r, u_char *ip, size_t len)
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244 {
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245 u_char *p;
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246 ngx_int_t rc;
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247 ngx_addr_t addr;
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248 ngx_connection_t *c;
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249 ngx_pool_cleanup_t *cln;
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250 ngx_http_realip_ctx_t *ctx;
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286
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251
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540
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252 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_realip_ctx_t));
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253 if (cln == NULL) {
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254 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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255 }
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286
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256
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540
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257 ctx = cln->data;
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258 ngx_http_set_ctx(r, ctx, ngx_http_realip_module);
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259
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260 c = r->connection;
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261
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262 rc = ngx_parse_addr(c->pool, &addr, ip, len);
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122
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263
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540
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264 switch (rc) {
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265 case NGX_DECLINED:
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266 return NGX_DECLINED;
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267 case NGX_ERROR:
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268 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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269 default: /* NGX_OK */
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270 break;
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271 }
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122
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272
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540
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273 p = ngx_pnalloc(c->pool, len);
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274 if (p == NULL) {
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275 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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276 }
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396
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277
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540
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278 ngx_memcpy(p, ip, len);
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396
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279
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540
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280 cln->handler = ngx_http_realip_cleanup;
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286
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281
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540
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282 ctx->connection = c;
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283 ctx->sockaddr = c->sockaddr;
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284 ctx->socklen = c->socklen;
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285 ctx->addr_text = c->addr_text;
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122
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286
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540
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287 c->sockaddr = addr.sockaddr;
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288 c->socklen = addr.socklen;
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289 c->addr_text.len = len;
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290 c->addr_text.data = p;
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122
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291
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272
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292 return NGX_DECLINED;
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122
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293 }
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294
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295
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396
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296 static void
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297 ngx_http_realip_cleanup(void *data)
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298 {
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299 ngx_http_realip_ctx_t *ctx = data;
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300
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540
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301 ngx_connection_t *c;
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396
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302
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303 c = ctx->connection;
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304
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540
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305 c->sockaddr = ctx->sockaddr;
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306 c->socklen = ctx->socklen;
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396
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307 c->addr_text = ctx->addr_text;
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308 }
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309
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310
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122
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311 static char *
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312 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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313 {
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314 ngx_http_realip_loc_conf_t *rlcf = conf;
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315
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412
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316 ngx_int_t rc;
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317 ngx_str_t *value;
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454
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318 ngx_cidr_t cidr;
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412
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319 ngx_http_realip_from_t *from;
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122
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320
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540
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321 value = cf->args->elts;
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322
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323 #if (NGX_HAVE_UNIX_DOMAIN)
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324
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325 if (ngx_strcmp(value[1].data, "unix:") == 0) {
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326 rlcf->unixsock = 1;
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327 return NGX_CONF_OK;
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328 }
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329
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330 #endif
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331
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122
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332 if (rlcf->from == NULL) {
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333 rlcf->from = ngx_array_create(cf->pool, 2,
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334 sizeof(ngx_http_realip_from_t));
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335 if (rlcf->from == NULL) {
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336 return NGX_CONF_ERROR;
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337 }
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338 }
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339
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340 from = ngx_array_push(rlcf->from);
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341 if (from == NULL) {
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342 return NGX_CONF_ERROR;
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343 }
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344
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454
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345 rc = ngx_ptocidr(&value[1], &cidr);
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326
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346
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347 if (rc == NGX_ERROR) {
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122
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348 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
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349 &value[1]);
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350 return NGX_CONF_ERROR;
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351 }
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352
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454
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353 if (cidr.family != AF_INET) {
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354 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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540
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355 "\"set_real_ip_from\" supports IPv4 only");
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454
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356 return NGX_CONF_ERROR;
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357 }
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358
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326
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359 if (rc == NGX_DONE) {
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360 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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361 "low address bits of %V are meaningless", &value[1]);
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362 }
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363
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454
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364 from->mask = cidr.u.in.mask;
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365 from->addr = cidr.u.in.addr;
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122
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366
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367 return NGX_CONF_OK;
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368 }
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369
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370
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412
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371 static char *
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372 ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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373 {
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374 ngx_http_realip_loc_conf_t *rlcf = conf;
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375
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376 ngx_str_t *value;
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377
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378 value = cf->args->elts;
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379
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380 if (ngx_strcmp(value[1].data, "X-Real-IP") == 0) {
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381 rlcf->type = NGX_HTTP_REALIP_XREALIP;
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382 return NGX_CONF_OK;
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383 }
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384
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385 if (ngx_strcmp(value[1].data, "X-Forwarded-For") == 0) {
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386 rlcf->type = NGX_HTTP_REALIP_XFWD;
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387 return NGX_CONF_OK;
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388 }
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389
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390 rlcf->type = NGX_HTTP_REALIP_HEADER;
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391 rlcf->hash = ngx_hash_strlow(value[1].data, value[1].data, value[1].len);
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392 rlcf->header = value[1];
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393
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394 return NGX_CONF_OK;
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395 }
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396
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397
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122
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398 static void *
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399 ngx_http_realip_create_loc_conf(ngx_conf_t *cf)
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400 {
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401 ngx_http_realip_loc_conf_t *conf;
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402
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403 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t));
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404 if (conf == NULL) {
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496
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405 return NULL;
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122
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406 }
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407
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408 /*
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409 * set by ngx_pcalloc():
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410 *
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411 * conf->from = NULL;
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412
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412 * conf->hash = 0;
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413 * conf->header = { 0, NULL };
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540
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414 * conf->unixsock = 0;
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122
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415 */
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416
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412
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417 conf->type = NGX_CONF_UNSET_UINT;
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122
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418
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419 return conf;
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420 }
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421
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422
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423 static char *
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424 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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425 {
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426 ngx_http_realip_loc_conf_t *prev = parent;
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427 ngx_http_realip_loc_conf_t *conf = child;
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428
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429 if (conf->from == NULL) {
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430 conf->from = prev->from;
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540
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431 #if (NGX_HAVE_UNIX_DOMAIN)
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432 conf->unixsock = prev->unixsock;
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433 #endif
|
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122
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434 }
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435
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412
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436 ngx_conf_merge_uint_value(conf->type, prev->type, NGX_HTTP_REALIP_XREALIP);
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437
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438 if (conf->header.len == 0) {
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439 conf->hash = prev->hash;
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440 conf->header = prev->header;
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441 }
|
|
122
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442
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443 return NGX_CONF_OK;
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444 }
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445
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446
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447 static ngx_int_t
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|
230
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448 ngx_http_realip_init(ngx_conf_t *cf)
|
|
122
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449 {
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450 ngx_http_handler_pt *h;
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451 ngx_http_core_main_conf_t *cmcf;
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452
|
|
230
|
453 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
|
|
122
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454
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|
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455 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers);
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456 if (h == NULL) {
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457 return NGX_ERROR;
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|
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458 }
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459
|
|
|
460 *h = ngx_http_realip_handler;
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|
|
461
|
|
130
|
462 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
|
|
122
|
463 if (h == NULL) {
|
|
|
464 return NGX_ERROR;
|
|
|
465 }
|
|
|
466
|
|
|
467 *h = ngx_http_realip_handler;
|
|
|
468
|
|
|
469 return NGX_OK;
|
|
|
470 }
|
