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0
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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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32
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12 #define NGX_HTTP_REWRITE_COPY_CAPTURE 0
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13 #define NGX_HTTP_REWRITE_COPY_SHORT 1
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14 #define NGX_HTTP_REWRITE_COPY_LONG 2
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15 #define NGX_HTTP_REWRITE_START_ARGS 3
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0
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16
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17
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18 typedef struct {
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19 ngx_int_t op;
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20 size_t len;
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21 uintptr_t data;
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22 } ngx_http_rewrite_op_t;
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23
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24
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25 typedef struct {
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26 ngx_regex_t *regex;
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30
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27 ngx_uint_t ncaptures;
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0
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28
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29 ngx_array_t ops;
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30 ngx_uint_t size;
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31
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32 ngx_str_t re_name;
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33 ngx_str_t s_name;
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34
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35 ngx_uint_t status;
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36 unsigned last:1;
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37 } ngx_http_rewrite_rule_t;
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38
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39
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40 typedef struct {
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41 ngx_array_t rules;
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42 ngx_flag_t log;
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43 } ngx_http_rewrite_srv_conf_t;
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44
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45
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46 typedef struct {
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47 ngx_str_t redirect;
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48 } ngx_http_rewrite_loc_conf_t;
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49
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50
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51 static void *ngx_http_rewrite_create_srv_conf(ngx_conf_t *cf);
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52 static char *ngx_http_rewrite_merge_srv_conf(ngx_conf_t *cf,
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53 void *parent, void *child);
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54 static void *ngx_http_rewrite_create_loc_conf(ngx_conf_t *cf);
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55 static char *ngx_http_rewrite_rule(ngx_conf_t *cf, ngx_command_t *cmd,
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56 void *conf);
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57 static char *ngx_http_redirect(ngx_conf_t *cf, void *post, void *data);
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58 static ngx_int_t ngx_http_rewrite_init(ngx_cycle_t *cycle);
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59
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60
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61 static ngx_conf_post_handler_pt ngx_http_redirect_p = ngx_http_redirect;
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62
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63
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64 static ngx_command_t ngx_http_rewrite_commands[] = {
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65
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66 { ngx_string("rewrite"),
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67 NGX_HTTP_SRV_CONF|NGX_CONF_TAKE23,
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68 ngx_http_rewrite_rule,
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69 NGX_HTTP_SRV_CONF_OFFSET,
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70 0,
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71 NULL },
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72
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73 { ngx_string("redirect"),
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74 NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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75 ngx_conf_set_str_slot,
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76 NGX_HTTP_LOC_CONF_OFFSET,
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77 0,
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78 &ngx_http_redirect_p },
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79
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80 { ngx_string("rewrite_log"),
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81 NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
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82 ngx_conf_set_flag_slot,
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83 NGX_HTTP_SRV_CONF_OFFSET,
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84 offsetof(ngx_http_rewrite_srv_conf_t, log),
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85 NULL },
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86
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87 ngx_null_command
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88 };
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89
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90
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91 ngx_http_module_t ngx_http_rewrite_module_ctx = {
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92 NULL, /* pre conf */
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93
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94 NULL, /* create main configuration */
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95 NULL, /* init main configuration */
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96
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97 ngx_http_rewrite_create_srv_conf, /* create server configuration */
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98 ngx_http_rewrite_merge_srv_conf, /* merge server configuration */
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99
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100 ngx_http_rewrite_create_loc_conf, /* create location configration */
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101 NULL, /* merge location configration */
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102 };
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103
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104
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105 ngx_module_t ngx_http_rewrite_module = {
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106 NGX_MODULE,
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107 &ngx_http_rewrite_module_ctx, /* module context */
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108 ngx_http_rewrite_commands, /* module directives */
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109 NGX_HTTP_MODULE, /* module type */
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110 ngx_http_rewrite_init, /* init module */
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111 NULL /* init child */
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112 };
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113
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114
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115 static ngx_int_t ngx_http_rewrite_handler(ngx_http_request_t *r)
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116 {
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30
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117 int *captures;
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0
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118 u_char *p;
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119 size_t len;
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120 uintptr_t data;
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121 ngx_int_t rc;
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122 ngx_uint_t i, m, n;
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32
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123 ngx_str_t uri, args;
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0
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124 ngx_http_rewrite_op_t *op;
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125 ngx_http_rewrite_rule_t *rule;
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126 ngx_http_rewrite_srv_conf_t *scf;
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127
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128 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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129 "http rewrite handler");
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130
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131 scf = ngx_http_get_module_srv_conf(r, ngx_http_rewrite_module);
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132
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133 rule = scf->rules.elts;
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134 for (i = 0; i < scf->rules.nelts; i++) {
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135
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30
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136 if (rule[i].ncaptures) {
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137 captures = ngx_palloc(r->pool, rule[i].ncaptures * sizeof(int));
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138 if (captures == NULL) {
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0
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139 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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140 }
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141
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142 } else {
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30
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143 captures = NULL;
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0
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144 }
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145
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30
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146 rc = ngx_regex_exec(rule[i].regex, &r->uri,
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147 captures, rule[i].ncaptures);
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0
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148
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30
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149 if (rc == NGX_REGEX_NO_MATCHED) {
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0
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150 if (scf->log) {
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151 ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
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10
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152 "\"%V\" does not match \"%V\"",
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153 &rule[i].re_name, &r->uri);
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0
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154 }
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155
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156 continue;
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157 }
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158
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159 if (rc < 0) {
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160 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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161 ngx_regex_exec_n
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10
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162 " failed: %d on \"%V\" using \"%V\"",
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163 rc, &r->uri, &rule[i].re_name);
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0
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164 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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165 }
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166
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167 if (scf->log) {
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168 ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
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10
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169 "\"%V\" matches \"%V\"",
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170 &rule[i].re_name, &r->uri);
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0
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171 }
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172
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173 if (rule[i].status) {
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174 return rule[i].status;
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175 }
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176
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177 uri.len = rule[i].size;
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178
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179 for (n = 1; n < (ngx_uint_t) rc; n++) {
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32
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180 uri.len += captures[2 * n + 1] - captures[2 * n];
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0
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181 }
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182
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10
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183 if (!(uri.data = ngx_palloc(r->pool, uri.len))) {
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0
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184 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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185 }
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186
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32
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187 args.data = NULL;
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0
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188 p = uri.data;
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189
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190 op = rule[i].ops.elts;
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191 for (n = 0; n < rule[i].ops.nelts; n++) {
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192 if (op[n].op == NGX_HTTP_REWRITE_COPY_SHORT) {
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193 len = op[n].len;
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194 data = op[n].data;
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195 while (len--) {
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196 *p++ = (char) (data & 0xff);
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197 data >>= 8;
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198 }
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199
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200 } else if (op[n].op == NGX_HTTP_REWRITE_COPY_LONG) {
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201 p = ngx_cpymem(p, (void *) op[n].data, op[n].len);
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202
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32
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203 } else if (op[n].op == NGX_HTTP_REWRITE_START_ARGS) {
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204 args.data = p;
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205
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206 } else { /* NGX_HTTP_REWRITE_COPY_CAPTURE */
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0
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207 m = 2 * op[n].data;
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30
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208 p = ngx_cpymem(p, &r->uri.data[captures[m]],
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209 captures[m + 1] - captures[m]);
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0
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210 }
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211 }
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212
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32
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213 if (args.data) {
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214 uri.len = args.data - uri.data;
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215 args.len = p - args.data;
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216
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217 r->args = args;
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218
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219 } else {
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220 uri.len = p - uri.data;
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221 args.len = 0;
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222 }
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223
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224 r->uri = uri;
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30
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225
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0
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226 if (scf->log) {
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227 ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
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32
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228 "rewritten uri: \"%V\", args: \"%V\"", &uri, &args);
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0
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229 }
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230
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231 if (ngx_http_set_exten(r) != NGX_OK) {
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232 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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233 }
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234
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235 if (rule[i].last) {
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236 return NGX_DECLINED;
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237 }
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238 }
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239
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240 return NGX_DECLINED;
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241 }
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242
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243
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244 static ngx_int_t ngx_http_redirect_handler(ngx_http_request_t *r)
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245 {
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246 u_char *p;
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247 ngx_http_rewrite_loc_conf_t *rlcf;
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248
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249 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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250 "http redirect handler");
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251
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252 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_rewrite_module);
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253
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254 r->headers_out.location = ngx_list_push(&r->headers_out.headers);
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255 if (r->headers_out.location == NULL) {
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256 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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257 }
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258
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259 if (rlcf->redirect.data[0] != '/') {
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260 r->headers_out.location->key.len = sizeof("Location") - 1;
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261 r->headers_out.location->key.data = (u_char *) "Location";
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262 }
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263
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264 r->headers_out.location->value.len = rlcf->redirect.len
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265 + r->unparsed_uri.len;
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266 r->headers_out.location->value.data = ngx_palloc(r->pool,
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267 r->headers_out.location->value.len);
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268
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269 if (r->headers_out.location->value.data == NULL) {
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270 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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271 }
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272
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273 p = ngx_cpymem(r->headers_out.location->value.data, rlcf->redirect.data,
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274 rlcf->redirect.len);
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275 p = ngx_cpystrn(p, r->unparsed_uri.data + 1, r->unparsed_uri.len);
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276
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277 return NGX_HTTP_MOVED_TEMPORARILY;
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278 }
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279
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280
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281 static void *ngx_http_rewrite_create_srv_conf(ngx_conf_t *cf)
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282 {
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283 ngx_http_rewrite_srv_conf_t *conf;
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284
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285 if (!(conf = ngx_palloc(cf->pool, sizeof(ngx_http_rewrite_srv_conf_t)))) {
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286 return NGX_CONF_ERROR;
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287 }
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288
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289 ngx_init_array(conf->rules, cf->pool, 5, sizeof(ngx_http_rewrite_rule_t),
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290 NGX_CONF_ERROR);
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291
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292 conf->log = NGX_CONF_UNSET;
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293
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294 return conf;
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295 }
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296
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297
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298 static char *ngx_http_rewrite_merge_srv_conf(ngx_conf_t *cf,
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299 void *parent, void *child)
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300 {
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301 ngx_http_rewrite_srv_conf_t *prev = parent;
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302 ngx_http_rewrite_srv_conf_t *conf = child;
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303
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304 ngx_conf_merge_value(conf->log, prev->log, 0);
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305
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306 return NGX_CONF_OK;
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307 }
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308
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309
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310 static void *ngx_http_rewrite_create_loc_conf(ngx_conf_t *cf)
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311 {
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312 ngx_http_rewrite_loc_conf_t *conf;
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313
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314 if (!(conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_rewrite_loc_conf_t)))) {
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315 return NGX_CONF_ERROR;
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316 }
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317
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318 return conf;
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319 }
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320
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321
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322 static char *ngx_http_rewrite_rule(ngx_conf_t *cf, ngx_command_t *cmd,
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323 void *conf)
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324 {
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325 ngx_http_rewrite_srv_conf_t *scf = conf;
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326
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327 u_char *data, *p;
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328 size_t len;
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329 ngx_str_t *value, err;
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30
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330 ngx_uint_t i, n;
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0
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331 ngx_http_rewrite_op_t *op;
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332 ngx_http_rewrite_rule_t *rule;
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333 u_char errstr[NGX_MAX_CONF_ERRSTR];
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334
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335 if (!(rule = ngx_push_array(&scf->rules))) {
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336 return NGX_CONF_ERROR;
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337 }
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338
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339 ngx_init_array(rule->ops, cf->pool, 5, sizeof(ngx_http_rewrite_op_t),
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340 NGX_CONF_ERROR);
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341
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30
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342 rule->ncaptures = 0;
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0
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343 rule->size = 0;
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344 rule->status = 0;
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345 rule->last = 0;
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346
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347 value = cf->args->elts;
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348
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349 /* STUB */ {
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350 err.len = NGX_MAX_CONF_ERRSTR;
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351 err.data = errstr;
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352
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353 rule->regex = ngx_regex_compile(&value[1], 0, cf->pool, &err);
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354
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355 if (rule->regex == NULL) {
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356 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s", err.data);
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357 return NGX_CONF_ERROR;
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358 }
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359
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360 rule->re_name = value[1];
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361 rule->s_name = value[2];
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362
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363 if (ngx_strcasecmp(value[2].data, "forbidden:") == 0) {
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364
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365 if (cf->args->nelts == 3) {
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366 rule->status = NGX_HTTP_FORBIDDEN;
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367 rule->last = 1;
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368 return NGX_CONF_OK;
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369 }
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370
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371 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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10
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372 "invalid parameter \"%V\"", &value[3]);
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0
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373 return NGX_CONF_ERROR;
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374 }
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375
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32
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376 i = 0;
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377
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378 while (i < value[2].len) {
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0
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379
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380 if (!(op = ngx_push_array(&rule->ops))) {
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381 return NGX_CONF_ERROR;
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382 }
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383
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384 data = &value[2].data[i];
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385
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386 if (value[2].data[i] == '$'
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387 && i < value[2].len
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388 && value[2].data[i + 1] >= '1'
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389 && value[2].data[i + 1] <= '9')
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390 {
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32
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391 op->op = NGX_HTTP_REWRITE_COPY_CAPTURE;
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392 op->len = 0;
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0
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393 op->data = value[2].data[++i] - '0';
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394
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30
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395 if (rule->ncaptures < op->data) {
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|
|
396 rule->ncaptures = op->data;
|
|
0
|
397 }
|
|
|
398
|
|
|
399 i++;
|
|
|
400
|
|
32
|
401 continue;
|
|
|
402 }
|
|
|
403
|
|
|
404 if (value[2].data[i] == '?') {
|
|
|
405 op->op = NGX_HTTP_REWRITE_START_ARGS;
|
|
|
406 op->len = 0;
|
|
|
407 op->data = 0;
|
|
|
408
|
|
0
|
409 i++;
|
|
|
410
|
|
32
|
411 continue;
|
|
|
412 }
|
|
0
|
413
|
|
32
|
414 i++;
|
|
0
|
415
|
|
32
|
416 while (i < value[2].len
|
|
|
417 && value[2].data[i] != '$'
|
|
|
418 && value[2].data[i] != '?')
|
|
|
419 {
|
|
|
420 i++;
|
|
|
421 }
|
|
0
|
422
|
|
32
|
423 len = &value[2].data[i] - data;
|
|
|
424 rule->size += len;
|
|
|
425
|
|
|
426 if (len) {
|
|
|
427
|
|
|
428 op->len = len;
|
|
0
|
429
|
|
32
|
430 if (len <= sizeof(uintptr_t)) {
|
|
|
431 op->op = NGX_HTTP_REWRITE_COPY_SHORT;
|
|
|
432 op->data = 0;
|
|
0
|
433
|
|
32
|
434 while (len--) {
|
|
|
435 op->data <<= 8;
|
|
|
436 op->data |= data[len];
|
|
|
437 }
|
|
0
|
438
|
|
32
|
439 } else {
|
|
|
440 op->op = NGX_HTTP_REWRITE_COPY_LONG;
|
|
0
|
441
|
|
32
|
442 if (!(p = ngx_palloc(cf->pool, len))) {
|
|
|
443 return NGX_CONF_ERROR;
|
|
0
|
444 }
|
|
32
|
445
|
|
|
446 ngx_memcpy(p, data, len);
|
|
|
447 op->data = (uintptr_t) p;
|
|
0
|
448 }
|
|
|
449 }
|
|
|
450 }
|
|
|
451
|
|
30
|
452 n = ngx_regex_capture_count(rule->regex);
|
|
|
453
|
|
|
454 if (rule->ncaptures > n) {
|
|
|
455 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
456 "pattern \"%V\" has less captures "
|
|
|
457 "than referrenced in substitution \"%V\"",
|
|
|
458 &value[1], &value[2]);
|
|
|
459 return NGX_CONF_ERROR;
|
|
|
460 }
|
|
|
461
|
|
|
462 if (rule->ncaptures < n) {
|
|
|
463 rule->ncaptures = n;
|
|
|
464 }
|
|
|
465
|
|
|
466 if (rule->ncaptures) {
|
|
|
467 rule->ncaptures = (rule->ncaptures + 1) * 3;
|
|
0
|
468 }
|
|
|
469
|
|
|
470 if (cf->args->nelts > 3) {
|
|
|
471 if (ngx_strcmp(value[3].data, "last") == 0) {
|
|
|
472 rule->last = 1;
|
|
|
473
|
|
|
474 } else {
|
|
|
475 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
10
|
476 "invalid parameter \"%V\"", &value[3]);
|
|
0
|
477 return NGX_CONF_ERROR;
|
|
|
478 }
|
|
|
479 }
|
|
|
480 }
|
|
|
481
|
|
|
482 return NGX_CONF_OK;
|
|
|
483 }
|
|
|
484
|
|
|
485
|
|
|
486 static char *ngx_http_redirect(ngx_conf_t *cf, void *post, void *data)
|
|
|
487 {
|
|
|
488 ngx_http_core_loc_conf_t *clcf;
|
|
|
489
|
|
|
490 clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
|
|
|
491 clcf->handler = ngx_http_redirect_handler;
|
|
|
492
|
|
|
493 return NGX_CONF_OK;
|
|
|
494 }
|
|
|
495
|
|
|
496
|
|
|
497 static ngx_int_t ngx_http_rewrite_init(ngx_cycle_t *cycle)
|
|
|
498 {
|
|
|
499 ngx_http_handler_pt *h;
|
|
|
500 ngx_http_core_main_conf_t *cmcf;
|
|
|
501
|
|
|
502 cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module);
|
|
|
503
|
|
|
504 h = ngx_push_array(&cmcf->phases[NGX_HTTP_REWRITE_PHASE].handlers);
|
|
|
505 if (h == NULL) {
|
|
|
506 return NGX_ERROR;
|
|
|
507 }
|
|
|
508
|
|
|
509 *h = ngx_http_rewrite_handler;
|
|
|
510
|
|
|
511 return NGX_OK;
|
|
|
512 }
|
