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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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26 ngx_uint_t msize;
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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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116 int *matches;
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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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135 if (rule[i].msize) {
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136 if (!(matches = ngx_palloc(r->pool, rule[i].msize * sizeof(int)))) {
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137 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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138 }
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139
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140 } else {
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141 matches = NULL;
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142 }
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143
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144 rc = ngx_regex_exec(rule[i].regex, &r->uri, matches, rule[i].msize);
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145
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146 if (rc == NGX_DECLINED) {
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147 if (scf->log) {
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148 ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
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149 "\"%s\" does not match \"%s\"",
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150 rule[i].re_name.data, r->uri.data);
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151 }
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152
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153 continue;
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154 }
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155
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156 if (rc < 0) {
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157 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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158 ngx_regex_exec_n
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159 " failed: %d on \"%s\" using \"%s\"",
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160 rc, r->uri.data, rule[i].re_name.data);
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161 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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162 }
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163
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164 if (scf->log) {
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165 ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
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166 "\"%s\" matches \"%s\"",
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167 rule[i].re_name.data, r->uri.data);
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168 }
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169
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170 if (rule[i].status) {
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171 return rule[i].status;
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172 }
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173
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174 uri.len = rule[i].size;
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175
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176 for (n = 1; n < (ngx_uint_t) rc; n++) {
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177 uri.len += matches[2 * n + 1] - matches[2 * n];
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178 }
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179
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180 if (!(uri.data = ngx_palloc(r->pool, uri.len + 1))) {
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181 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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182 }
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183
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184 p = uri.data;
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185
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186 op = rule[i].ops.elts;
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187 for (n = 0; n < rule[i].ops.nelts; n++) {
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188 if (op[n].op == NGX_HTTP_REWRITE_COPY_SHORT) {
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189 len = op[n].len;
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190 data = op[n].data;
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191 while (len--) {
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192 *p++ = (char) (data & 0xff);
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193 data >>= 8;
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194 }
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195
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196 } else if (op[n].op == NGX_HTTP_REWRITE_COPY_LONG) {
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197 p = ngx_cpymem(p, (void *) op[n].data, op[n].len);
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198
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199 } else { /* NGX_HTTP_REWRITE_COPY_MATCH */
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200 m = 2 * op[n].data;
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201 p = ngx_cpymem(p, &r->uri.data[matches[m]],
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202 matches[m + 1] - matches[m]);
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203 }
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204 }
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205
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206 *p = '\0';
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207
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208 if (scf->log) {
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209 ngx_log_error(NGX_LOG_NOTICE, r->connection->log, 0,
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210 "rewritten uri: \"%s\"", uri.data);
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211 }
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212
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213 r->uri = uri;
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214
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215 if (ngx_http_set_exten(r) != NGX_OK) {
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216 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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217 }
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218
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219 if (rule[i].last) {
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220 return NGX_DECLINED;
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221 }
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222 }
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223
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224 return NGX_DECLINED;
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225 }
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226
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227
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228 static ngx_int_t ngx_http_redirect_handler(ngx_http_request_t *r)
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229 {
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230 u_char *p;
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231 ngx_http_rewrite_loc_conf_t *rlcf;
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232
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233 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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234 "http redirect handler");
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235
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236 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_rewrite_module);
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237
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238 r->headers_out.location = ngx_list_push(&r->headers_out.headers);
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239 if (r->headers_out.location == NULL) {
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240 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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241 }
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242
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243 if (rlcf->redirect.data[0] != '/') {
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244 r->headers_out.location->key.len = sizeof("Location") - 1;
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245 r->headers_out.location->key.data = (u_char *) "Location";
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246 }
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247
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248 r->headers_out.location->value.len = rlcf->redirect.len
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249 + r->unparsed_uri.len;
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250 r->headers_out.location->value.data = ngx_palloc(r->pool,
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251 r->headers_out.location->value.len);
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252
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253 if (r->headers_out.location->value.data == NULL) {
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254 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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255 }
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256
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257 p = ngx_cpymem(r->headers_out.location->value.data, rlcf->redirect.data,
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258 rlcf->redirect.len);
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259 p = ngx_cpystrn(p, r->unparsed_uri.data + 1, r->unparsed_uri.len);
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260
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261 return NGX_HTTP_MOVED_TEMPORARILY;
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262 }
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263
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264
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265 static void *ngx_http_rewrite_create_srv_conf(ngx_conf_t *cf)
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266 {
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267 ngx_http_rewrite_srv_conf_t *conf;
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268
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269 if (!(conf = ngx_palloc(cf->pool, sizeof(ngx_http_rewrite_srv_conf_t)))) {
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270 return NGX_CONF_ERROR;
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271 }
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272
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273 ngx_init_array(conf->rules, cf->pool, 5, sizeof(ngx_http_rewrite_rule_t),
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274 NGX_CONF_ERROR);
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275
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276 conf->log = NGX_CONF_UNSET;
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277
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278 return conf;
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279 }
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280
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281
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282 static char *ngx_http_rewrite_merge_srv_conf(ngx_conf_t *cf,
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283 void *parent, void *child)
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284 {
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285 ngx_http_rewrite_srv_conf_t *prev = parent;
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286 ngx_http_rewrite_srv_conf_t *conf = child;
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287
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288 ngx_conf_merge_value(conf->log, prev->log, 0);
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289
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290 return NGX_CONF_OK;
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291 }
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292
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293
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294 static void *ngx_http_rewrite_create_loc_conf(ngx_conf_t *cf)
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295 {
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296 ngx_http_rewrite_loc_conf_t *conf;
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297
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298 if (!(conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_rewrite_loc_conf_t)))) {
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299 return NGX_CONF_ERROR;
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300 }
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301
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302 return conf;
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303 }
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304
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305
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306 static char *ngx_http_rewrite_rule(ngx_conf_t *cf, ngx_command_t *cmd,
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307 void *conf)
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308 {
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309 ngx_http_rewrite_srv_conf_t *scf = conf;
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310
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311 u_char *data, *p;
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312 size_t len;
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313 ngx_str_t *value, err;
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314 ngx_uint_t i;
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315 ngx_http_rewrite_op_t *op;
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316 ngx_http_rewrite_rule_t *rule;
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317 u_char errstr[NGX_MAX_CONF_ERRSTR];
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318
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319 if (!(rule = ngx_push_array(&scf->rules))) {
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320 return NGX_CONF_ERROR;
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321 }
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322
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323 ngx_init_array(rule->ops, cf->pool, 5, sizeof(ngx_http_rewrite_op_t),
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324 NGX_CONF_ERROR);
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325
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326 rule->msize = 0;
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327 rule->size = 0;
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328 rule->status = 0;
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329 rule->last = 0;
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330
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331 value = cf->args->elts;
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332
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333 /* STUB */ {
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334 err.len = NGX_MAX_CONF_ERRSTR;
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335 err.data = errstr;
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336
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337 rule->regex = ngx_regex_compile(&value[1], 0, cf->pool, &err);
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338
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339 if (rule->regex == NULL) {
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340 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s", err.data);
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341 return NGX_CONF_ERROR;
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342 }
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343
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344 rule->re_name = value[1];
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345 rule->s_name = value[2];
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346
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347 if (ngx_strcasecmp(value[2].data, "forbidden:") == 0) {
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348
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349 if (cf->args->nelts == 3) {
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350 rule->status = NGX_HTTP_FORBIDDEN;
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351 rule->last = 1;
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352 return NGX_CONF_OK;
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353 }
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354
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355 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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356 "invalid parameter \"%s\"", value[3].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 for (i = 0; i < value[2].len; /* void */) {
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361
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362 if (!(op = ngx_push_array(&rule->ops))) {
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363 return NGX_CONF_ERROR;
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364 }
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365
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366 data = &value[2].data[i];
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367
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368 if (value[2].data[i] == '$'
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369 && i < value[2].len
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370 && value[2].data[i + 1] >= '1'
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371 && value[2].data[i + 1] <= '9')
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372 {
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373 op->op = NGX_HTTP_REWRITE_COPY_MATCH;
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374 op->data = value[2].data[++i] - '0';
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375
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376 if (rule->msize < op->data) {
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377 rule->msize = op->data;
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378 }
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379
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380 i++;
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381
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382 } else {
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383 i++;
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384
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385 while (i < value[2].len && value[2].data[i] != '$') {
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386 i++;
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387 }
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388
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389 len = &value[2].data[i] - data;
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390 rule->size += len;
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391
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392 if (len) {
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393
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394 op->len = len;
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395
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396 if (len <= sizeof(uintptr_t)) {
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397 op->op = NGX_HTTP_REWRITE_COPY_SHORT;
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398 op->data = 0;
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399
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400 while (len--) {
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401 op->data <<= 8;
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402 op->data |= data[len];
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403 }
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404
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405 } else {
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406 op->op = NGX_HTTP_REWRITE_COPY_LONG;
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|
407
|
|
|
408 if (!(p = ngx_palloc(cf->pool, len))) {
|
|
|
409 return NGX_CONF_ERROR;
|
|
|
410 }
|
|
|
411
|
|
|
412 ngx_memcpy(p, data, len);
|
|
|
413 op->data = (uintptr_t) p;
|
|
|
414 }
|
|
|
415 }
|
|
|
416 }
|
|
|
417 }
|
|
|
418
|
|
|
419 if (rule->msize) {
|
|
|
420 rule->msize++;
|
|
|
421 rule->msize *= 3;
|
|
|
422 }
|
|
|
423
|
|
|
424 if (cf->args->nelts > 3) {
|
|
|
425 if (ngx_strcmp(value[3].data, "last") == 0) {
|
|
|
426 rule->last = 1;
|
|
|
427
|
|
|
428 } else {
|
|
|
429 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
430 "invalid parameter \"%s\"", value[3].data);
|
|
|
431 return NGX_CONF_ERROR;
|
|
|
432 }
|
|
|
433 }
|
|
|
434 }
|
|
|
435
|
|
|
436 return NGX_CONF_OK;
|
|
|
437 }
|
|
|
438
|
|
|
439
|
|
|
440 static char *ngx_http_redirect(ngx_conf_t *cf, void *post, void *data)
|
|
|
441 {
|
|
|
442 ngx_http_core_loc_conf_t *clcf;
|
|
|
443
|
|
|
444 clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
|
|
|
445 clcf->handler = ngx_http_redirect_handler;
|
|
|
446
|
|
|
447 return NGX_CONF_OK;
|
|
|
448 }
|
|
|
449
|
|
|
450
|
|
|
451 static ngx_int_t ngx_http_rewrite_init(ngx_cycle_t *cycle)
|
|
|
452 {
|
|
|
453 ngx_http_handler_pt *h;
|
|
|
454 ngx_http_core_main_conf_t *cmcf;
|
|
|
455
|
|
|
456 cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module);
|
|
|
457
|
|
|
458 h = ngx_push_array(&cmcf->phases[NGX_HTTP_REWRITE_PHASE].handlers);
|
|
|
459 if (h == NULL) {
|
|
|
460 return NGX_ERROR;
|
|
|
461 }
|
|
|
462
|
|
|
463 *h = ngx_http_rewrite_handler;
|
|
|
464
|
|
|
465 return NGX_OK;
|
|
|
466 }
|
