1
2 /*
3 * Copyright (C) Igor Sysoev
4 * Copyright (C) Nginx, Inc.
5 */
6
7
8 #include <ngx_config.h>
9 #include <ngx_core.h>
10 #include <ngx_http.h>
11
12
13 typedef struct {
14 ngx_chain_t *free;
15 ngx_chain_t *busy;
16 } ngx_http_chunked_filter_ctx_t;
17
18
19 static ngx_int_t ngx_http_chunked_filter_init(ngx_conf_t *cf);
20
21
22 static ngx_http_module_t ngx_http_chunked_filter_module_ctx = {
23 NULL, /* preconfiguration */
24 ngx_http_chunked_filter_init, /* postconfiguration */
25
26 NULL, /* create main configuration */
27 NULL, /* init main configuration */
28
29 NULL, /* create server configuration */
30 NULL, /* merge server configuration */
31
32 NULL, /* create location configuration */
33 NULL /* merge location configuration */
34 };
35
36
37 ngx_module_t ngx_http_chunked_filter_module = {
38 NGX_MODULE_V1,
39 &ngx_http_chunked_filter_module_ctx, /* module context */
40 NULL, /* module directives */
41 NGX_HTTP_MODULE, /* module type */
42 NULL, /* init master */
43 NULL, /* init module */
44 NULL, /* init process */
45 NULL, /* init thread */
46 NULL, /* exit thread */
47 NULL, /* exit process */
48 NULL, /* exit master */
49 NGX_MODULE_V1_PADDING
50 };
51
52
53 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
54 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
55
56
57 static ngx_int_t
58 ngx_http_chunked_header_filter(ngx_http_request_t *r)
59 {
60 ngx_http_core_loc_conf_t *clcf;
61 ngx_http_chunked_filter_ctx_t *ctx;
62
63 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED
64 || r->headers_out.status == NGX_HTTP_NO_CONTENT
65 || r->headers_out.status < NGX_HTTP_OK
66 || r != r->main
67 || (r->method & NGX_HTTP_HEAD))
68 {
69 return ngx_http_next_header_filter(r);
70 }
71
72 if (r->headers_out.content_length_n == -1) {
73 if (r->http_version < NGX_HTTP_VERSION_11) {
74 r->keepalive = 0;
75
76 } else {
77 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
78
79 if (clcf->chunked_transfer_encoding) {
80 r->chunked = 1;
81
82 ctx = ngx_pcalloc(r->pool,
83 sizeof(ngx_http_chunked_filter_ctx_t));
84 if (ctx == NULL) {
85 return NGX_ERROR;
86 }
87
88 ngx_http_set_ctx(r, ctx, ngx_http_chunked_filter_module);
89
90 } else {
91 r->keepalive = 0;
92 }
93 }
94 }
95
96 return ngx_http_next_header_filter(r);
97 }
98
99
100 static ngx_int_t
101 ngx_http_chunked_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
102 {
103 u_char *chunk;
104 off_t size;
105 ngx_int_t rc;
106 ngx_buf_t *b;
107 ngx_chain_t *out, *cl, *tl, **ll;
108 ngx_http_chunked_filter_ctx_t *ctx;
109
110 if (in == NULL || !r->chunked || r->header_only) {
111 return ngx_http_next_body_filter(r, in);
112 }
113
114 ctx = ngx_http_get_module_ctx(r, ngx_http_chunked_filter_module);
115
116 out = NULL;
117 ll = &out;
118
119 size = 0;
120 cl = in;
121
122 for ( ;; ) {
123 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
124 "http chunk: %d", ngx_buf_size(cl->buf));
125
126 size += ngx_buf_size(cl->buf);
127
128 if (cl->buf->flush
129 || cl->buf->sync
130 || ngx_buf_in_memory(cl->buf)
131 || cl->buf->in_file)
132 {
133 tl = ngx_alloc_chain_link(r->pool);
134 if (tl == NULL) {
135 return NGX_ERROR;
136 }
137
138 tl->buf = cl->buf;
139 *ll = tl;
140 ll = &tl->next;
141 }
142
143 if (cl->next == NULL) {
144 break;
145 }
146
147 cl = cl->next;
148 }
149
150 if (size) {
151 tl = ngx_chain_get_free_buf(r->pool, &ctx->free);
152 if (tl == NULL) {
153 return NGX_ERROR;
154 }
155
156 b = tl->buf;
157 chunk = b->start;
158
159 if (chunk == NULL) {
160 /* the "0000000000000000" is 64-bit hexadecimal string */
161
162 chunk = ngx_palloc(r->pool, sizeof("0000000000000000" CRLF) - 1);
163 if (chunk == NULL) {
164 return NGX_ERROR;
165 }
166
167 b->start = chunk;
168 b->end = chunk + sizeof("0000000000000000" CRLF) - 1;
169 }
170
171 b->tag = (ngx_buf_tag_t) &ngx_http_chunked_filter_module;
172 b->memory = 0;
173 b->temporary = 1;
174 b->pos = chunk;
175 b->last = ngx_sprintf(chunk, "%xO" CRLF, size);
176
177 tl->next = out;
178 out = tl;
179 }
180
181 if (cl->buf->last_buf) {
182 tl = ngx_chain_get_free_buf(r->pool, &ctx->free);
183 if (tl == NULL) {
184 return NGX_ERROR;
185 }
186
187 b = tl->buf;
188
189 b->tag = (ngx_buf_tag_t) &ngx_http_chunked_filter_module;
190 b->temporary = 0;
191 b->memory = 1;
192 b->last_buf = 1;
193 b->pos = (u_char *) CRLF "" CRLF CRLF;
194 b->last = b->pos + 7;
195
196 cl->buf->last_buf = 0;
197
198 *ll = tl;
199
200 if (size == 0) {
201 b->pos += 2;
202 }
203
204 } else if (size > 0) {
205 tl = ngx_chain_get_free_buf(r->pool, &ctx->free);
206 if (tl == NULL) {
207 return NGX_ERROR;
208 }
209
210 b = tl->buf;
211
212 b->tag = (ngx_buf_tag_t) &ngx_http_chunked_filter_module;
213 b->temporary = 0;
214 b->memory = 1;
215 b->pos = (u_char *) CRLF;
216 b->last = b->pos + 2;
217
218 *ll = tl;
219
220 } else {
221 *ll = NULL;
222 }
223
224 rc = ngx_http_next_body_filter(r, out);
225
226 ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &out,
227 (ngx_buf_tag_t) &ngx_http_chunked_filter_module);
228
229 return rc;
230 }
231
232
233 static ngx_int_t
234 ngx_http_chunked_filter_init(ngx_conf_t *cf)
235 {
236 ngx_http_next_header_filter = ngx_http_top_header_filter;
237 ngx_http_top_header_filter = ngx_http_chunked_header_filter;
238
239 ngx_http_next_body_filter = ngx_http_top_body_filter;
240 ngx_http_top_body_filter = ngx_http_chunked_body_filter;
241
242 return NGX_OK;
243 }
244
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