296
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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 typedef struct {
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13 ngx_str_t match;
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14 ngx_str_t sub;
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15
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394
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16 ngx_hash_t types;
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296
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17
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18 ngx_array_t *sub_lengths;
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19 ngx_array_t *sub_values;
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20
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21 ngx_flag_t once;
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394
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22
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23 ngx_array_t *types_keys;
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296
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24 } ngx_http_sub_loc_conf_t;
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25
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26
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27 typedef enum {
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28 sub_start_state = 0,
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29 sub_match_state,
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30 } ngx_http_sub_state_e;
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31
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32
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33 typedef struct {
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34 ngx_str_t match;
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35
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36 ngx_uint_t once; /* unsigned once:1 */
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37
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38 ngx_buf_t *buf;
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39
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40 u_char *pos;
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41 u_char *copy_start;
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42 u_char *copy_end;
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43
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44 ngx_chain_t *in;
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45 ngx_chain_t *out;
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46 ngx_chain_t **last_out;
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47 ngx_chain_t *busy;
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48 ngx_chain_t *free;
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49
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50 ngx_str_t sub;
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51
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52 ngx_uint_t state;
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53 size_t saved;
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54 size_t looked;
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55 } ngx_http_sub_ctx_t;
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56
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57
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58 static ngx_int_t ngx_http_sub_output(ngx_http_request_t *r,
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59 ngx_http_sub_ctx_t *ctx);
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60 static ngx_int_t ngx_http_sub_parse(ngx_http_request_t *r,
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61 ngx_http_sub_ctx_t *ctx);
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62
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63 static char * ngx_http_sub_filter(ngx_conf_t *cf, ngx_command_t *cmd,
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64 void *conf);
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65 static void *ngx_http_sub_create_conf(ngx_conf_t *cf);
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66 static char *ngx_http_sub_merge_conf(ngx_conf_t *cf,
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67 void *parent, void *child);
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68 static ngx_int_t ngx_http_sub_filter_init(ngx_conf_t *cf);
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69
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70
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71 static ngx_command_t ngx_http_sub_filter_commands[] = {
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72
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73 { ngx_string("sub_filter"),
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74 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
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75 ngx_http_sub_filter,
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76 NGX_HTTP_LOC_CONF_OFFSET,
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77 0,
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78 NULL },
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79
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80 { ngx_string("sub_filter_types"),
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81 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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82 ngx_http_types_slot,
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83 NGX_HTTP_LOC_CONF_OFFSET,
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84 offsetof(ngx_http_sub_loc_conf_t, types_keys),
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85 &ngx_http_html_default_types[0] },
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296
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86
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87 { ngx_string("sub_filter_once"),
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88 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
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89 ngx_conf_set_flag_slot,
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90 NGX_HTTP_LOC_CONF_OFFSET,
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91 offsetof(ngx_http_sub_loc_conf_t, once),
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92 NULL },
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93
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94 ngx_null_command
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95 };
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96
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97
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98 static ngx_http_module_t ngx_http_sub_filter_module_ctx = {
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99 NULL, /* preconfiguration */
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100 ngx_http_sub_filter_init, /* postconfiguration */
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101
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102 NULL, /* create main configuration */
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103 NULL, /* init main configuration */
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104
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105 NULL, /* create server configuration */
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106 NULL, /* merge server configuration */
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107
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108 ngx_http_sub_create_conf, /* create location configuration */
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109 ngx_http_sub_merge_conf /* merge location configuration */
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110 };
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111
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112
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113 ngx_module_t ngx_http_sub_filter_module = {
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114 NGX_MODULE_V1,
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115 &ngx_http_sub_filter_module_ctx, /* module context */
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116 ngx_http_sub_filter_commands, /* module directives */
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117 NGX_HTTP_MODULE, /* module type */
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118 NULL, /* init master */
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119 NULL, /* init module */
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120 NULL, /* init process */
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121 NULL, /* init thread */
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122 NULL, /* exit thread */
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123 NULL, /* exit process */
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124 NULL, /* exit master */
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125 NGX_MODULE_V1_PADDING
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126 };
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127
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128
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129 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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130 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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131
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132
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133 static ngx_int_t
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134 ngx_http_sub_header_filter(ngx_http_request_t *r)
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135 {
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136 ngx_http_sub_ctx_t *ctx;
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137 ngx_http_sub_loc_conf_t *slcf;
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138
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139 slcf = ngx_http_get_module_loc_conf(r, ngx_http_sub_filter_module);
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140
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141 if (slcf->match.len == 0
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394
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142 || r->headers_out.content_length_n == 0
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143 || ngx_http_test_content_type(r, &slcf->types) == NULL)
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296
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144 {
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145 return ngx_http_next_header_filter(r);
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146 }
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147
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148 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_sub_ctx_t));
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149 if (ctx == NULL) {
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150 return NGX_ERROR;
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151 }
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152
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153 ngx_http_set_ctx(r, ctx, ngx_http_sub_filter_module);
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154
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155 ctx->match = slcf->match;
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156 ctx->last_out = &ctx->out;
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157 ctx->sub = slcf->sub;
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158
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159 r->filter_need_in_memory = 1;
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160
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161 if (r == r->main) {
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162 ngx_http_clear_content_length(r);
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163 ngx_http_clear_last_modified(r);
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164 }
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165
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166 return ngx_http_next_header_filter(r);
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167 }
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168
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169
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170 static ngx_int_t
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171 ngx_http_sub_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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172 {
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173 ngx_int_t rc;
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174 ngx_buf_t *b;
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175 ngx_chain_t *cl;
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176 ngx_http_sub_ctx_t *ctx;
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177 ngx_http_sub_loc_conf_t *slcf;
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178
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179 ctx = ngx_http_get_module_ctx(r, ngx_http_sub_filter_module);
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180
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181 if (ctx == NULL) {
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182 return ngx_http_next_body_filter(r, in);
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183 }
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184
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185 if ((in == NULL
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186 && ctx->buf == NULL
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187 && ctx->in == NULL
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188 && ctx->busy == NULL))
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189 {
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190 return ngx_http_next_body_filter(r, in);
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191 }
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192
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193 if (ctx->once && (ctx->buf == NULL || ctx->in == NULL)) {
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194
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195 if (ctx->busy) {
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196 if (ngx_http_sub_output(r, ctx) == NGX_ERROR) {
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197 return NGX_ERROR;
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198 }
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199 }
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200
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201 return ngx_http_next_body_filter(r, in);
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202 }
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203
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204 /* add the incoming chain to the chain ctx->in */
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205
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206 if (in) {
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207 if (ngx_chain_add_copy(r->pool, &ctx->in, in) == NGX_ERROR) {
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208 return NGX_ERROR;
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209 }
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210 }
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211
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212 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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213 "http sub filter \"%V\"", &r->uri);
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214
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215 while (ctx->in || ctx->buf) {
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216
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217 if (ctx->buf == NULL ){
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218 ctx->buf = ctx->in->buf;
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219 ctx->in = ctx->in->next;
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220 ctx->pos = ctx->buf->pos;
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221 }
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222
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223 if (ctx->state == sub_start_state) {
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224 ctx->copy_start = ctx->pos;
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225 ctx->copy_end = ctx->pos;
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226 }
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227
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228 b = NULL;
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229
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230 while (ctx->pos < ctx->buf->last) {
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231
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232 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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233 "saved: %d state: %d", ctx->saved, ctx->state);
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234
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235 rc = ngx_http_sub_parse(r, ctx);
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236
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237 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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238 "parse: %d, looked: %d %p-%p",
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239 rc, ctx->looked, ctx->copy_start, ctx->copy_end);
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240
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241 if (rc == NGX_ERROR) {
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242 return rc;
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243 }
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244
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245 if (ctx->copy_start != ctx->copy_end) {
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246
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247 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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248 "saved: %d", ctx->saved);
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249
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250 if (ctx->saved) {
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251
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252 if (ctx->free) {
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253 cl = ctx->free;
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254 ctx->free = ctx->free->next;
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255 b = cl->buf;
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256 ngx_memzero(b, sizeof(ngx_buf_t));
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257
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258 } else {
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259 b = ngx_calloc_buf(r->pool);
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260 if (b == NULL) {
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261 return NGX_ERROR;
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262 }
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263
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264 cl = ngx_alloc_chain_link(r->pool);
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265 if (cl == NULL) {
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266 return NGX_ERROR;
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267 }
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268
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269 cl->buf = b;
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270 }
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271
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272 b->memory = 1;
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273 b->pos = ctx->match.data;
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274 b->last = ctx->match.data + ctx->saved;
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275
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276 *ctx->last_out = cl;
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277 ctx->last_out = &cl->next;
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278
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279 ctx->saved = 0;
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280 }
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281
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282 if (ctx->free) {
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283 cl = ctx->free;
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284 ctx->free = ctx->free->next;
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285 b = cl->buf;
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286
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287 } else {
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288 b = ngx_alloc_buf(r->pool);
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289 if (b == NULL) {
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290 return NGX_ERROR;
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291 }
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292
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293 cl = ngx_alloc_chain_link(r->pool);
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294 if (cl == NULL) {
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295 return NGX_ERROR;
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296 }
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297
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298 cl->buf = b;
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299 }
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300
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301 ngx_memcpy(b, ctx->buf, sizeof(ngx_buf_t));
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302
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303 b->pos = ctx->copy_start;
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304 b->last = ctx->copy_end;
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305 b->shadow = NULL;
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306 b->last_buf = 0;
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307 b->recycled = 0;
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308
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309 if (b->in_file) {
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310 b->file_last = b->file_pos + (b->last - ctx->buf->pos);
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311 b->file_pos += b->pos - ctx->buf->pos;
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296
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312 }
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313
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314 cl->next = NULL;
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315 *ctx->last_out = cl;
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316 ctx->last_out = &cl->next;
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317 }
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318
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319 if (ctx->state == sub_start_state) {
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320 ctx->copy_start = ctx->pos;
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321 ctx->copy_end = ctx->pos;
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322
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323 } else {
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324 ctx->copy_start = NULL;
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325 ctx->copy_end = NULL;
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326 }
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327
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328 if (rc == NGX_AGAIN) {
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329 continue;
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330 }
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331
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332
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333 /* rc == NGX_OK */
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334
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335 b = ngx_calloc_buf(r->pool);
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336 if (b == NULL) {
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337 return NGX_ERROR;
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338 }
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339
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340 cl = ngx_alloc_chain_link(r->pool);
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341 if (cl == NULL) {
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342 return NGX_ERROR;
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343 }
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344
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345 slcf = ngx_http_get_module_loc_conf(r, ngx_http_sub_filter_module);
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346
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347 if (ctx->sub.data == NULL) {
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348
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349 if (ngx_http_script_run(r, &ctx->sub, slcf->sub_lengths->elts,
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350 0, slcf->sub_values->elts)
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351 == NULL)
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352 {
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353 return NGX_ERROR;
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354 }
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355 }
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356
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340
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357 if (ctx->sub.len) {
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358 b->memory = 1;
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359 b->pos = ctx->sub.data;
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360 b->last = ctx->sub.data + ctx->sub.len;
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361
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362 } else {
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363 b->sync = 1;
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364 }
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296
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365
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366 cl->buf = b;
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367 cl->next = NULL;
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368 *ctx->last_out = cl;
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369 ctx->last_out = &cl->next;
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370
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371 ctx->once = slcf->once;
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372
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373 continue;
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374 }
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375
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376 if (ctx->buf->last_buf || ngx_buf_in_memory(ctx->buf)) {
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377 if (b == NULL) {
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378 if (ctx->free) {
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379 cl = ctx->free;
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380 ctx->free = ctx->free->next;
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381 b = cl->buf;
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382 ngx_memzero(b, sizeof(ngx_buf_t));
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383
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384 } else {
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385 b = ngx_calloc_buf(r->pool);
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386 if (b == NULL) {
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387 return NGX_ERROR;
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388 }
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389
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390 cl = ngx_alloc_chain_link(r->pool);
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391 if (cl == NULL) {
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392 return NGX_ERROR;
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393 }
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394
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395 cl->buf = b;
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396 }
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397
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398 b->sync = 1;
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399
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400 cl->next = NULL;
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401 *ctx->last_out = cl;
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402 ctx->last_out = &cl->next;
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403 }
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404
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405 b->last_buf = ctx->buf->last_buf;
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406 b->shadow = ctx->buf;
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407
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408 b->recycled = ctx->buf->recycled;
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409 }
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410
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411 ctx->buf = NULL;
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412
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413 ctx->saved = ctx->looked;
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414 }
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415
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416 if (ctx->out == NULL && ctx->busy == NULL) {
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417 return NGX_OK;
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418 }
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419
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420 return ngx_http_sub_output(r, ctx);
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421 }
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422
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423
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424 static ngx_int_t
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425 ngx_http_sub_output(ngx_http_request_t *r, ngx_http_sub_ctx_t *ctx)
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426 {
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427 ngx_int_t rc;
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428 ngx_buf_t *b;
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429 ngx_chain_t *cl;
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430
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431 #if 1
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432 b = NULL;
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433 for (cl = ctx->out; cl; cl = cl->next) {
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434 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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435 "sub out: %p %p", cl->buf, cl->buf->pos);
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436 if (cl->buf == b) {
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437 ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
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438 "the same buf was used in sub");
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439 ngx_debug_point();
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440 return NGX_ERROR;
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441 }
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442 b = cl->buf;
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443 }
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444 #endif
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445
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446 rc = ngx_http_next_body_filter(r, ctx->out);
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447
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448 if (ctx->busy == NULL) {
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449 ctx->busy = ctx->out;
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450
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451 } else {
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452 for (cl = ctx->busy; cl->next; cl = cl->next) { /* void */ }
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453 cl->next = ctx->out;
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454 }
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455
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456 ctx->out = NULL;
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457 ctx->last_out = &ctx->out;
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458
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459 while (ctx->busy) {
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460
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461 cl = ctx->busy;
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462 b = cl->buf;
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463
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464 if (ngx_buf_size(b) != 0) {
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465 break;
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466 }
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467
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468 #if (NGX_HAVE_WRITE_ZEROCOPY)
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469 if (b->zerocopy_busy) {
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470 break;
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471 }
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472 #endif
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473
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474 if (b->shadow) {
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475 b->shadow->pos = b->shadow->last;
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476 }
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477
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478 ctx->busy = cl->next;
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479
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480 if (ngx_buf_in_memory(b) || b->in_file) {
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481 /* add data bufs only to the free buf chain */
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482
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483 cl->next = ctx->free;
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484 ctx->free = cl;
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485 }
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486 }
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487
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488 if (ctx->in || ctx->buf) {
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489 r->buffered |= NGX_HTTP_SUB_BUFFERED;
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490
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491 } else {
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492 r->buffered &= ~NGX_HTTP_SUB_BUFFERED;
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493 }
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494
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495 return rc;
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496 }
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497
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498
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499 static ngx_int_t
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500 ngx_http_sub_parse(ngx_http_request_t *r, ngx_http_sub_ctx_t *ctx)
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501 {
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502 u_char *p, *last, *copy_end, ch, match;
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503 size_t looked;
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504 ngx_http_sub_state_e state;
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505
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506 if (ctx->once) {
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507 ctx->copy_start = ctx->pos;
|
|
508 ctx->copy_end = ctx->buf->last;
|
|
509 ctx->pos = ctx->buf->last;
|
|
510 ctx->looked = 0;
|
|
511
|
|
512 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "once");
|
|
513
|
|
514 return NGX_AGAIN;
|
|
515 }
|
|
516
|
|
517 state = ctx->state;
|
|
518 looked = ctx->looked;
|
|
519 last = ctx->buf->last;
|
|
520 copy_end = ctx->copy_end;
|
|
521
|
|
522 for (p = ctx->pos; p < last; p++) {
|
|
523
|
|
524 ch = *p;
|
|
525 ch = ngx_tolower(ch);
|
|
526
|
|
527 if (state == sub_start_state) {
|
|
528
|
|
529 /* the tight loop */
|
|
530
|
|
531 match = ctx->match.data[0];
|
|
532
|
|
533 for ( ;; ) {
|
|
534 if (ch == match) {
|
|
535 copy_end = p;
|
|
536 looked = 1;
|
|
537 state = sub_match_state;
|
|
538
|
|
539 goto match_started;
|
|
540 }
|
|
541
|
|
542 if (++p == last) {
|
|
543 break;
|
|
544 }
|
|
545
|
|
546 ch = *p;
|
|
547 ch = ngx_tolower(ch);
|
|
548 }
|
|
549
|
340
|
550 ctx->state = state;
|
296
|
551 ctx->pos = p;
|
|
552 ctx->looked = looked;
|
|
553 ctx->copy_end = p;
|
|
554
|
|
555 if (ctx->copy_start == NULL) {
|
|
556 ctx->copy_start = ctx->buf->pos;
|
|
557 }
|
|
558
|
|
559 return NGX_AGAIN;
|
|
560
|
|
561 match_started:
|
|
562
|
|
563 continue;
|
|
564 }
|
|
565
|
|
566 /* state == sub_match_state */
|
|
567
|
|
568 if (ch == ctx->match.data[looked]) {
|
|
569 looked++;
|
|
570
|
|
571 if (looked == ctx->match.len) {
|
340
|
572 if ((size_t) (p - ctx->pos) < looked) {
|
|
573 ctx->saved = 0;
|
|
574 }
|
|
575
|
296
|
576 ctx->state = sub_start_state;
|
|
577 ctx->pos = p + 1;
|
372
|
578 ctx->looked = 0;
|
296
|
579 ctx->copy_end = copy_end;
|
|
580
|
|
581 if (ctx->copy_start == NULL && copy_end) {
|
|
582 ctx->copy_start = ctx->buf->pos;
|
|
583 }
|
|
584
|
|
585 return NGX_OK;
|
|
586 }
|
|
587
|
|
588 } else if (ch == ctx->match.data[0]) {
|
|
589 copy_end = p;
|
|
590 looked = 1;
|
|
591
|
|
592 } else {
|
|
593 copy_end = p;
|
|
594 looked = 0;
|
|
595 state = sub_start_state;
|
|
596 }
|
|
597 }
|
|
598
|
|
599 ctx->state = state;
|
|
600 ctx->pos = p;
|
|
601 ctx->looked = looked;
|
|
602
|
|
603 ctx->copy_end = (state == sub_start_state) ? p : copy_end;
|
|
604
|
|
605 if (ctx->copy_start == NULL && ctx->copy_end) {
|
|
606 ctx->copy_start = ctx->buf->pos;
|
|
607 }
|
|
608
|
|
609 return NGX_AGAIN;
|
|
610 }
|
|
611
|
|
612
|
|
613 static char *
|
|
614 ngx_http_sub_filter(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
615 {
|
|
616 ngx_http_sub_loc_conf_t *slcf = conf;
|
|
617
|
|
618 ngx_str_t *value;
|
|
619 ngx_int_t n;
|
|
620 ngx_http_script_compile_t sc;
|
|
621
|
|
622 if (slcf->match.len) {
|
|
623 return "is duplicate";
|
|
624 }
|
|
625
|
|
626 value = cf->args->elts;
|
|
627
|
392
|
628 ngx_strlow(value[1].data, value[1].data, value[1].len);
|
296
|
629
|
392
|
630 slcf->match = value[1];
|
296
|
631
|
|
632 n = ngx_http_script_variables_count(&value[2]);
|
|
633
|
|
634 if (n == 0) {
|
|
635 slcf->sub = value[2];
|
|
636 return NGX_CONF_OK;
|
|
637 }
|
|
638
|
|
639 ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
|
|
640
|
|
641 sc.cf = cf;
|
|
642 sc.source = &value[2];
|
|
643 sc.lengths = &slcf->sub_lengths;
|
|
644 sc.values = &slcf->sub_values;
|
|
645 sc.variables = n;
|
|
646 sc.complete_lengths = 1;
|
|
647 sc.complete_values = 1;
|
|
648
|
|
649 if (ngx_http_script_compile(&sc) != NGX_OK) {
|
|
650 return NGX_CONF_ERROR;
|
|
651 }
|
|
652
|
|
653 return NGX_CONF_OK;
|
|
654 }
|
|
655
|
|
656
|
|
657 static void *
|
|
658 ngx_http_sub_create_conf(ngx_conf_t *cf)
|
|
659 {
|
|
660 ngx_http_sub_loc_conf_t *slcf;
|
|
661
|
|
662 slcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_sub_loc_conf_t));
|
|
663 if (slcf == NULL) {
|
|
664 return NGX_CONF_ERROR;
|
|
665 }
|
|
666
|
|
667 /*
|
|
668 * set by ngx_pcalloc():
|
|
669 *
|
394
|
670 * conf->match = { 0, NULL };
|
|
671 * conf->sub = { 0, NULL };
|
296
|
672 * conf->sub_lengths = NULL;
|
|
673 * conf->sub_values = NULL;
|
394
|
674 * conf->types = { NULL };
|
|
675 * conf->types_keys = NULL;
|
296
|
676 */
|
|
677
|
|
678 slcf->once = NGX_CONF_UNSET;
|
|
679
|
|
680 return slcf;
|
|
681 }
|
|
682
|
|
683
|
|
684 static char *
|
|
685 ngx_http_sub_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
686 {
|
|
687 ngx_http_sub_loc_conf_t *prev = parent;
|
|
688 ngx_http_sub_loc_conf_t *conf = child;
|
|
689
|
|
690 ngx_conf_merge_value(conf->once, prev->once, 1);
|
|
691 ngx_conf_merge_str_value(conf->match, prev->match, "");
|
|
692
|
|
693 if (conf->sub.data == NULL && conf->sub_lengths == NULL) {
|
|
694 conf->sub = prev->sub;
|
|
695 conf->sub_lengths = prev->sub_lengths;
|
|
696 conf->sub_values = prev->sub_values;
|
|
697 }
|
|
698
|
394
|
699 if (ngx_http_merge_types(cf, conf->types_keys, &conf->types,
|
|
700 prev->types_keys, &prev->types,
|
|
701 ngx_http_html_default_types)
|
|
702 != NGX_OK)
|
|
703 {
|
|
704 return NGX_CONF_ERROR;
|
296
|
705 }
|
|
706
|
|
707 return NGX_CONF_OK;
|
|
708 }
|
|
709
|
|
710
|
|
711 static ngx_int_t
|
|
712 ngx_http_sub_filter_init(ngx_conf_t *cf)
|
|
713 {
|
|
714 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
715 ngx_http_top_header_filter = ngx_http_sub_header_filter;
|
|
716
|
|
717 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
718 ngx_http_top_body_filter = ngx_http_sub_body_filter;
|
|
719
|
|
720 return NGX_OK;
|
|
721 }
|