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50
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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660
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4 * Copyright (C) Nginx, Inc.
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50
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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11
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12
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640
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13 typedef struct {
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14 ngx_chain_t *free;
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15 ngx_chain_t *busy;
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16 } ngx_http_chunked_filter_ctx_t;
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17
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18
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230
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19 static ngx_int_t ngx_http_chunked_filter_init(ngx_conf_t *cf);
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50
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20
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21
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22 static ngx_http_module_t ngx_http_chunked_filter_module_ctx = {
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58
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23 NULL, /* preconfiguration */
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230
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24 ngx_http_chunked_filter_init, /* postconfiguration */
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25
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26 NULL, /* create main configuration */
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27 NULL, /* init main configuration */
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28
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29 NULL, /* create server configuration */
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30 NULL, /* merge server configuration */
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31
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32 NULL, /* create location configuration */
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178
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33 NULL /* merge location configuration */
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34 };
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35
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36
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37 ngx_module_t ngx_http_chunked_filter_module = {
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58
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38 NGX_MODULE_V1,
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39 &ngx_http_chunked_filter_module_ctx, /* module context */
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40 NULL, /* module directives */
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41 NGX_HTTP_MODULE, /* module type */
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90
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42 NULL, /* init master */
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230
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43 NULL, /* init module */
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90
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44 NULL, /* init process */
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45 NULL, /* init thread */
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46 NULL, /* exit thread */
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47 NULL, /* exit process */
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48 NULL, /* exit master */
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49 NGX_MODULE_V1_PADDING
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50
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50 };
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51
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52
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53 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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54 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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55
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56
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57 static ngx_int_t
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58 ngx_http_chunked_header_filter(ngx_http_request_t *r)
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59 {
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640
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60 ngx_http_core_loc_conf_t *clcf;
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61 ngx_http_chunked_filter_ctx_t *ctx;
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566
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62
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164
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63 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED
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64 || r->headers_out.status == NGX_HTTP_NO_CONTENT
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412
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65 || r != r->main
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66 || (r->method & NGX_HTTP_HEAD))
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164
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67 {
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68 return ngx_http_next_header_filter(r);
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69 }
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70
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71 if (r->headers_out.content_length_n == -1) {
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72 if (r->http_version < NGX_HTTP_VERSION_11) {
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73 r->keepalive = 0;
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74
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75 } else {
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566
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76 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
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77
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78 if (clcf->chunked_transfer_encoding) {
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79 r->chunked = 1;
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80
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640
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81 ctx = ngx_pcalloc(r->pool,
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82 sizeof(ngx_http_chunked_filter_ctx_t));
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83 if (ctx == NULL) {
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84 return NGX_ERROR;
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85 }
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86
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87 ngx_http_set_ctx(r, ctx, ngx_http_chunked_filter_module);
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88
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566
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89 } else {
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90 r->keepalive = 0;
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91 }
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92 }
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93 }
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94
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95 return ngx_http_next_header_filter(r);
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96 }
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97
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98
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99 static ngx_int_t
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100 ngx_http_chunked_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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101 {
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640
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102 u_char *chunk;
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103 off_t size;
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104 ngx_int_t rc;
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105 ngx_buf_t *b;
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106 ngx_chain_t *out, *cl, *tl, **ll;
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107 ngx_http_chunked_filter_ctx_t *ctx;
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108
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109 if (in == NULL || !r->chunked || r->header_only) {
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110 return ngx_http_next_body_filter(r, in);
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111 }
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112
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640
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113 ctx = ngx_http_get_module_ctx(r, ngx_http_chunked_filter_module);
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114
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115 out = NULL;
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116 ll = &out;
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117
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118 size = 0;
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119 cl = in;
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120
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121 for ( ;; ) {
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122 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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123 "http chunk: %d", ngx_buf_size(cl->buf));
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124
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125 size += ngx_buf_size(cl->buf);
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126
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216
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127 if (cl->buf->flush
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128 || cl->buf->sync
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129 || ngx_buf_in_memory(cl->buf)
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130 || cl->buf->in_file)
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131 {
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132 tl = ngx_alloc_chain_link(r->pool);
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133 if (tl == NULL) {
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134 return NGX_ERROR;
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135 }
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136
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137 tl->buf = cl->buf;
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138 *ll = tl;
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139 ll = &tl->next;
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140 }
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141
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142 if (cl->next == NULL) {
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143 break;
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144 }
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145
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146 cl = cl->next;
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147 }
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148
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149 if (size) {
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640
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150 tl = ngx_chain_get_free_buf(r->pool, &ctx->free);
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151 if (tl == NULL) {
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152 return NGX_ERROR;
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153 }
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154
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640
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155 b = tl->buf;
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156 chunk = b->start;
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157
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158 if (chunk == NULL) {
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159 /* the "0000000000000000" is 64-bit hexadecimal string */
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160
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161 chunk = ngx_palloc(r->pool, sizeof("0000000000000000" CRLF) - 1);
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162 if (chunk == NULL) {
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163 return NGX_ERROR;
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164 }
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165
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166 b->start = chunk;
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167 b->end = chunk + sizeof("0000000000000000" CRLF) - 1;
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168 }
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169
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170 b->tag = (ngx_buf_tag_t) &ngx_http_chunked_filter_module;
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171 b->memory = 0;
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172 b->temporary = 1;
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173 b->pos = chunk;
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174 b->last = ngx_sprintf(chunk, "%xO" CRLF, size);
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175
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640
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176 tl->next = out;
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177 out = tl;
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178 }
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179
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180 if (cl->buf->last_buf) {
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640
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181 tl = ngx_chain_get_free_buf(r->pool, &ctx->free);
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182 if (tl == NULL) {
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183 return NGX_ERROR;
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184 }
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185
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640
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186 b = tl->buf;
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187
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188 b->tag = (ngx_buf_tag_t) &ngx_http_chunked_filter_module;
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189 b->temporary = 0;
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190 b->memory = 1;
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191 b->last_buf = 1;
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192 b->pos = (u_char *) CRLF "0" CRLF CRLF;
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193 b->last = b->pos + 7;
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194
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195 cl->buf->last_buf = 0;
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196
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197 *ll = tl;
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198
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199 if (size == 0) {
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200 b->pos += 2;
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201 }
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202
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640
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203 } else if (size > 0) {
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204 tl = ngx_chain_get_free_buf(r->pool, &ctx->free);
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205 if (tl == NULL) {
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206 return NGX_ERROR;
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207 }
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208
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209 b = tl->buf;
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210
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211 b->tag = (ngx_buf_tag_t) &ngx_http_chunked_filter_module;
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212 b->temporary = 0;
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213 b->memory = 1;
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214 b->pos = (u_char *) CRLF;
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215 b->last = b->pos + 2;
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640
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216
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217 *ll = tl;
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218
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219 } else {
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220 *ll = NULL;
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221 }
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222
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223 rc = ngx_http_next_body_filter(r, out);
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224
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225 ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &out,
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226 (ngx_buf_tag_t) &ngx_http_chunked_filter_module);
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227
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228 return rc;
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229 }
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230
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231
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232 static ngx_int_t
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233 ngx_http_chunked_filter_init(ngx_conf_t *cf)
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234 {
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235 ngx_http_next_header_filter = ngx_http_top_header_filter;
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236 ngx_http_top_header_filter = ngx_http_chunked_header_filter;
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237
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238 ngx_http_next_body_filter = ngx_http_top_body_filter;
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239 ngx_http_top_body_filter = ngx_http_chunked_body_filter;
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240
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241 return NGX_OK;
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242 }
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