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