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