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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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640
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12 typedef struct {
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13 ngx_chain_t *free;
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14 ngx_chain_t *busy;
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15 } ngx_http_chunked_filter_ctx_t;
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16
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17
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230
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18 static ngx_int_t ngx_http_chunked_filter_init(ngx_conf_t *cf);
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50
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19
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20
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21 static ngx_http_module_t ngx_http_chunked_filter_module_ctx = {
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58
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22 NULL, /* preconfiguration */
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230
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23 ngx_http_chunked_filter_init, /* postconfiguration */
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24
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25 NULL, /* create main configuration */
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26 NULL, /* init main configuration */
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27
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28 NULL, /* create server configuration */
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29 NULL, /* merge server configuration */
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30
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31 NULL, /* create location configuration */
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178
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32 NULL /* merge location configuration */
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50
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33 };
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34
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35
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36 ngx_module_t ngx_http_chunked_filter_module = {
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58
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37 NGX_MODULE_V1,
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50
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38 &ngx_http_chunked_filter_module_ctx, /* module context */
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39 NULL, /* module directives */
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40 NGX_HTTP_MODULE, /* module type */
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90
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41 NULL, /* init master */
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230
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42 NULL, /* init module */
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90
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43 NULL, /* init process */
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44 NULL, /* init thread */
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45 NULL, /* exit thread */
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46 NULL, /* exit process */
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47 NULL, /* exit master */
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48 NGX_MODULE_V1_PADDING
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50
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49 };
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50
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51
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52 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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53 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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54
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55
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56 static ngx_int_t
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57 ngx_http_chunked_header_filter(ngx_http_request_t *r)
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58 {
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640
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59 ngx_http_core_loc_conf_t *clcf;
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60 ngx_http_chunked_filter_ctx_t *ctx;
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566
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61
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164
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62 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED
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63 || r->headers_out.status == NGX_HTTP_NO_CONTENT
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412
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64 || r != r->main
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65 || (r->method & NGX_HTTP_HEAD))
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164
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66 {
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67 return ngx_http_next_header_filter(r);
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68 }
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69
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70 if (r->headers_out.content_length_n == -1) {
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71 if (r->http_version < NGX_HTTP_VERSION_11) {
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72 r->keepalive = 0;
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73
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74 } else {
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566
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75 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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76
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77 if (clcf->chunked_transfer_encoding) {
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78 r->chunked = 1;
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79
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640
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80 ctx = ngx_pcalloc(r->pool,
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81 sizeof(ngx_http_chunked_filter_ctx_t));
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82 if (ctx == NULL) {
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83 return NGX_ERROR;
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84 }
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85
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86 ngx_http_set_ctx(r, ctx, ngx_http_chunked_filter_module);
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87
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566
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88 } else {
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89 r->keepalive = 0;
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90 }
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50
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91 }
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92 }
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93
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94 return ngx_http_next_header_filter(r);
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95 }
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96
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97
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98 static ngx_int_t
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99 ngx_http_chunked_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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100 {
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640
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101 u_char *chunk;
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102 off_t size;
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103 ngx_int_t rc;
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104 ngx_buf_t *b;
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105 ngx_chain_t *out, *cl, *tl, **ll;
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106 ngx_http_chunked_filter_ctx_t *ctx;
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107
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108 if (in == NULL || !r->chunked || r->header_only) {
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109 return ngx_http_next_body_filter(r, in);
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110 }
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111
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640
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112 ctx = ngx_http_get_module_ctx(r, ngx_http_chunked_filter_module);
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113
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114 out = NULL;
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115 ll = &out;
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116
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117 size = 0;
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118 cl = in;
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119
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120 for ( ;; ) {
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121 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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122 "http chunk: %d", ngx_buf_size(cl->buf));
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123
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124 size += ngx_buf_size(cl->buf);
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125
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216
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126 if (cl->buf->flush
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127 || cl->buf->sync
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128 || ngx_buf_in_memory(cl->buf)
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129 || cl->buf->in_file)
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130 {
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131 tl = ngx_alloc_chain_link(r->pool);
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132 if (tl == NULL) {
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133 return NGX_ERROR;
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134 }
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135
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136 tl->buf = cl->buf;
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137 *ll = tl;
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138 ll = &tl->next;
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139 }
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140
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141 if (cl->next == NULL) {
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142 break;
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143 }
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144
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145 cl = cl->next;
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146 }
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147
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148 if (size) {
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640
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149 tl = ngx_chain_get_free_buf(r->pool, &ctx->free);
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150 if (tl == NULL) {
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151 return NGX_ERROR;
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152 }
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153
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640
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154 b = tl->buf;
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155 chunk = b->start;
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156
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157 if (chunk == NULL) {
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158 /* the "0000000000000000" is 64-bit hexadecimal string */
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159
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160 chunk = ngx_palloc(r->pool, sizeof("0000000000000000" CRLF) - 1);
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161 if (chunk == NULL) {
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162 return NGX_ERROR;
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163 }
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164
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165 b->start = chunk;
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166 b->end = chunk + sizeof("0000000000000000" CRLF) - 1;
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167 }
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168
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169 b->tag = (ngx_buf_tag_t) &ngx_http_chunked_filter_module;
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170 b->memory = 0;
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171 b->temporary = 1;
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172 b->pos = chunk;
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173 b->last = ngx_sprintf(chunk, "%xO" CRLF, size);
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174
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640
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175 tl->next = out;
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176 out = tl;
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177 }
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178
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179 if (cl->buf->last_buf) {
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640
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180 tl = ngx_chain_get_free_buf(r->pool, &ctx->free);
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181 if (tl == NULL) {
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182 return NGX_ERROR;
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183 }
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184
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640
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185 b = tl->buf;
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186
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187 b->tag = (ngx_buf_tag_t) &ngx_http_chunked_filter_module;
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188 b->temporary = 0;
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189 b->memory = 1;
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190 b->last_buf = 1;
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191 b->pos = (u_char *) CRLF "0" CRLF CRLF;
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192 b->last = b->pos + 7;
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193
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194 cl->buf->last_buf = 0;
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195
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196 *ll = tl;
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197
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198 if (size == 0) {
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199 b->pos += 2;
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200 }
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201
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640
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202 } else if (size > 0) {
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203 tl = ngx_chain_get_free_buf(r->pool, &ctx->free);
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204 if (tl == NULL) {
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205 return NGX_ERROR;
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206 }
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207
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208 b = tl->buf;
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209
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210 b->tag = (ngx_buf_tag_t) &ngx_http_chunked_filter_module;
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211 b->temporary = 0;
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212 b->memory = 1;
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213 b->pos = (u_char *) CRLF;
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214 b->last = b->pos + 2;
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640
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215
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216 *ll = tl;
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217
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218 } else {
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219 *ll = NULL;
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220 }
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221
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222 rc = ngx_http_next_body_filter(r, out);
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223
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224 ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &out,
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225 (ngx_buf_tag_t) &ngx_http_chunked_filter_module);
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226
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227 return rc;
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50
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228 }
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229
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230
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231 static ngx_int_t
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230
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232 ngx_http_chunked_filter_init(ngx_conf_t *cf)
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233 {
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234 ngx_http_next_header_filter = ngx_http_top_header_filter;
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235 ngx_http_top_header_filter = ngx_http_chunked_header_filter;
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236
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237 ngx_http_next_body_filter = ngx_http_top_body_filter;
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238 ngx_http_top_body_filter = ngx_http_chunked_body_filter;
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239
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240 return NGX_OK;
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241 }
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