| |
| /* |
| * Copyright (C) Igor Sysoev |
| */ |
| |
| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| #include <ngx_http.h> |
| |
| |
| /* |
| * the single part format: |
| * |
| * "HTTP/1.0 206 Partial Content" CRLF |
| * ... header ... |
| * "Content-Type: image/jpeg" CRLF |
| * "Content-Length: SIZE" CRLF |
| * "Content-Range: bytes START-END/SIZE" CRLF |
| * CRLF |
| * ... data ... |
| * |
| * |
| * the mutlipart format: |
| * |
| * "HTTP/1.0 206 Partial Content" CRLF |
| * ... header ... |
| * "Content-Type: multipart/byteranges; boundary=0123456789" CRLF |
| * CRLF |
| * CRLF |
| * "--0123456789" CRLF |
| * "Content-Type: image/jpeg" CRLF |
| * "Content-Range: bytes START0-END0/SIZE" CRLF |
| * CRLF |
| * ... data ... |
| * CRLF |
| * "--0123456789" CRLF |
| * "Content-Type: image/jpeg" CRLF |
| * "Content-Range: bytes START1-END1/SIZE" CRLF |
| * CRLF |
| * ... data ... |
| * CRLF |
| * "--0123456789--" CRLF |
| */ |
| |
| |
| typedef struct { |
| ngx_str_t boundary_header; |
| } ngx_http_range_filter_ctx_t; |
| |
| |
| static ngx_int_t ngx_http_range_header_filter_init(ngx_cycle_t *cycle); |
| static ngx_int_t ngx_http_range_body_filter_init(ngx_cycle_t *cycle); |
| |
| |
| static ngx_http_module_t ngx_http_range_header_filter_module_ctx = { |
| NULL, /* preconfiguration */ |
| NULL, /* postconfiguration */ |
| |
| NULL, /* create main configuration */ |
| NULL, /* init main configuration */ |
| |
| NULL, /* create server configuration */ |
| NULL, /* merge server configuration */ |
| |
| NULL, /* create location configuration */ |
| NULL, /* merge location configuration */ |
| }; |
| |
| |
| ngx_module_t ngx_http_range_header_filter_module = { |
| NGX_MODULE_V1, |
| &ngx_http_range_header_filter_module_ctx, /* module context */ |
| NULL, /* module directives */ |
| NGX_HTTP_MODULE, /* module type */ |
| NULL, /* init master */ |
| ngx_http_range_header_filter_init, /* init module */ |
| NULL, /* init process */ |
| NULL, /* init thread */ |
| NULL, /* exit thread */ |
| NULL, /* exit process */ |
| NULL, /* exit master */ |
| NGX_MODULE_V1_PADDING |
| }; |
| |
| |
| static ngx_http_module_t ngx_http_range_body_filter_module_ctx = { |
| NULL, /* preconfiguration */ |
| NULL, /* postconfiguration */ |
| |
| NULL, /* create main configuration */ |
| NULL, /* init main configuration */ |
| |
| NULL, /* create server configuration */ |
| NULL, /* merge server configuration */ |
| |
| NULL, /* create location configuration */ |
| NULL, /* merge location configuration */ |
| }; |
| |
| |
| ngx_module_t ngx_http_range_body_filter_module = { |
| NGX_MODULE_V1, |
| &ngx_http_range_body_filter_module_ctx, /* module context */ |
| NULL, /* module directives */ |
| NGX_HTTP_MODULE, /* module type */ |
| NULL, /* init master */ |
| ngx_http_range_body_filter_init, /* init module */ |
| NULL, /* init process */ |
| NULL, /* init thread */ |
| NULL, /* exit thread */ |
| NULL, /* exit process */ |
| NULL, /* exit master */ |
| NGX_MODULE_V1_PADDING |
| }; |
| |
| |
| static ngx_http_output_header_filter_pt ngx_http_next_header_filter; |
| static ngx_http_output_body_filter_pt ngx_http_next_body_filter; |
| |
| |
| static ngx_int_t |
| ngx_http_range_header_filter(ngx_http_request_t *r) |
| { |
| u_char *p; |
| size_t len; |
| off_t start, end; |
| ngx_int_t rc; |
| ngx_uint_t suffix, i; |
| ngx_atomic_uint_t boundary; |
| ngx_table_elt_t *content_range; |
| ngx_http_range_t *range; |
| ngx_http_range_filter_ctx_t *ctx; |
| |
| if (r->http_version < NGX_HTTP_VERSION_10 |
| || r->headers_out.status != NGX_HTTP_OK |
| || r != r->main |
| || r->headers_out.content_length_n == -1 |
| || !r->allow_ranges) |
| { |
| return ngx_http_next_header_filter(r); |
| } |
| |
| if (r->headers_in.range == NULL |
| || r->headers_in.range->value.len < 7 |
| || ngx_strncasecmp(r->headers_in.range->value.data, "bytes=", 6) != 0) |
| { |
| |
| r->headers_out.accept_ranges = ngx_list_push(&r->headers_out.headers); |
| if (r->headers_out.accept_ranges == NULL) { |
| return NGX_ERROR; |
| } |
| |
| r->headers_out.accept_ranges->hash = 1; |
| r->headers_out.accept_ranges->key.len = sizeof("Accept-Ranges") - 1; |
| r->headers_out.accept_ranges->key.data = (u_char *) "Accept-Ranges"; |
| r->headers_out.accept_ranges->value.len = sizeof("bytes") - 1; |
| r->headers_out.accept_ranges->value.data = (u_char *) "bytes"; |
| |
| return ngx_http_next_header_filter(r); |
| } |
| |
| if (ngx_array_init(&r->headers_out.ranges, r->pool, 2, |
| sizeof(ngx_http_range_t)) == NGX_ERROR) |
| { |
| return NGX_ERROR; |
| } |
| |
| rc = 0; |
| range = NULL; |
| p = r->headers_in.range->value.data + 6; |
| |
| for ( ;; ) { |
| start = 0; |
| end = 0; |
| suffix = 0; |
| |
| while (*p == ' ') { p++; } |
| |
| if (*p != '-') { |
| if (*p < '0' || *p > '9') { |
| rc = NGX_HTTP_RANGE_NOT_SATISFIABLE; |
| break; |
| } |
| |
| while (*p >= '0' && *p <= '9') { |
| start = start * 10 + *p++ - '0'; |
| } |
| |
| while (*p == ' ') { p++; } |
| |
| if (*p++ != '-') { |
| rc = NGX_HTTP_RANGE_NOT_SATISFIABLE; |
| break; |
| } |
| |
| if (start >= r->headers_out.content_length_n) { |
| rc = NGX_HTTP_RANGE_NOT_SATISFIABLE; |
| break; |
| } |
| |
| while (*p == ' ') { p++; } |
| |
| if (*p == ',' || *p == '\0') { |
| range = ngx_array_push(&r->headers_out.ranges); |
| if (range == NULL) { |
| return NGX_ERROR; |
| } |
| |
| range->start = start; |
| range->end = r->headers_out.content_length_n; |
| |
| if (*p++ != ',') { |
| break; |
| } |
| |
| continue; |
| } |
| |
| } else { |
| suffix = 1; |
| p++; |
| } |
| |
| if (*p < '0' || *p > '9') { |
| rc = NGX_HTTP_RANGE_NOT_SATISFIABLE; |
| break; |
| } |
| |
| while (*p >= '0' && *p <= '9') { |
| end = end * 10 + *p++ - '0'; |
| } |
| |
| while (*p == ' ') { p++; } |
| |
| if (*p != ',' && *p != '\0') { |
| rc = NGX_HTTP_RANGE_NOT_SATISFIABLE; |
| break; |
| } |
| |
| if (suffix) { |
| start = r->headers_out.content_length_n - end; |
| end = r->headers_out.content_length_n - 1; |
| } |
| |
| if (start > end) { |
| rc = NGX_HTTP_RANGE_NOT_SATISFIABLE; |
| break; |
| } |
| |
| range = ngx_array_push(&r->headers_out.ranges); |
| if (range == NULL) { |
| return NGX_ERROR; |
| } |
| |
| range->start = start; |
| |
| if (end >= r->headers_out.content_length_n) { |
| /* |
| * Download Accelerator sends the last byte position |
| * that equals to the file length |
| */ |
| range->end = r->headers_out.content_length_n; |
| |
| } else { |
| range->end = end + 1; |
| } |
| |
| if (*p++ != ',') { |
| break; |
| } |
| } |
| |
| if (rc) { |
| |
| /* rc == NGX_HTTP_RANGE_NOT_SATISFIABLE */ |
| |
| r->headers_out.status = rc; |
| r->headers_out.ranges.nelts = 0; |
| |
| content_range = ngx_list_push(&r->headers_out.headers); |
| if (content_range == NULL) { |
| return NGX_ERROR; |
| } |
| |
| r->headers_out.content_range = content_range; |
| |
| content_range->hash = 1; |
| content_range->key.len = sizeof("Content-Range") - 1; |
| content_range->key.data = (u_char *) "Content-Range"; |
| |
| content_range->value.data = ngx_palloc(r->pool, |
| sizeof("bytes */") - 1 + NGX_OFF_T_LEN); |
| if (content_range->value.data == NULL) { |
| return NGX_ERROR; |
| } |
| |
| content_range->value.len = ngx_sprintf(content_range->value.data, |
| "bytes */%O", |
| r->headers_out.content_length_n) |
| - content_range->value.data; |
| |
| ngx_http_clear_content_length(r); |
| |
| return rc; |
| } |
| |
| r->headers_out.status = NGX_HTTP_PARTIAL_CONTENT; |
| |
| if (r->headers_out.ranges.nelts == 1) { |
| |
| content_range = ngx_list_push(&r->headers_out.headers); |
| if (content_range == NULL) { |
| return NGX_ERROR; |
| } |
| |
| r->headers_out.content_range = content_range; |
| |
| content_range->hash = 1; |
| content_range->key.len = sizeof("Content-Range") - 1; |
| content_range->key.data = (u_char *) "Content-Range"; |
| |
| content_range->value.data = |
| ngx_palloc(r->pool, sizeof("bytes -/") - 1 + 3 * NGX_OFF_T_LEN); |
| if (content_range->value.data == NULL) { |
| return NGX_ERROR; |
| } |
| |
| /* "Content-Range: bytes SSSS-EEEE/TTTT" header */ |
| |
| content_range->value.len = ngx_sprintf(content_range->value.data, |
| "bytes %O-%O/%O", |
| range->start, range->end - 1, |
| r->headers_out.content_length_n) |
| - content_range->value.data; |
| |
| r->headers_out.content_length_n = range->end - range->start; |
| |
| return ngx_http_next_header_filter(r); |
| } |
| |
| |
| /* TODO: what if no content_type ?? */ |
| |
| ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_range_filter_ctx_t)); |
| if (ctx == NULL) { |
| return NGX_ERROR; |
| } |
| |
| ngx_http_set_ctx(r, ctx, ngx_http_range_body_filter_module); |
| |
| |
| len = sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN |
| + sizeof(CRLF "Content-Type: ") - 1 |
| + r->headers_out.content_type.len |
| + sizeof(CRLF "Content-Range: bytes ") - 1; |
| |
| if (r->headers_out.charset.len) { |
| len += sizeof("; charset=") - 1 + r->headers_out.charset.len; |
| } |
| |
| ctx->boundary_header.data = ngx_palloc(r->pool, len); |
| if (ctx->boundary_header.data == NULL) { |
| return NGX_ERROR; |
| } |
| |
| boundary = ngx_next_temp_number(0); |
| |
| /* |
| * The boundary header of the range: |
| * CRLF |
| * "--0123456789" CRLF |
| * "Content-Type: image/jpeg" CRLF |
| * "Content-Range: bytes " |
| */ |
| |
| if (r->headers_out.charset.len) { |
| ctx->boundary_header.len = ngx_sprintf(ctx->boundary_header.data, |
| CRLF "--%0muA" CRLF |
| "Content-Type: %V; charset=%V" CRLF |
| "Content-Range: bytes ", |
| boundary, |
| &r->headers_out.content_type, |
| &r->headers_out.charset) |
| - ctx->boundary_header.data; |
| |
| r->headers_out.charset.len = 0; |
| |
| } else { |
| ctx->boundary_header.len = ngx_sprintf(ctx->boundary_header.data, |
| CRLF "--%0muA" CRLF |
| "Content-Type: %V" CRLF |
| "Content-Range: bytes ", |
| boundary, |
| &r->headers_out.content_type) |
| - ctx->boundary_header.data; |
| } |
| |
| r->headers_out.content_type.data = |
| ngx_palloc(r->pool, |
| sizeof("Content-Type: multipart/byteranges; boundary=") - 1 |
| + NGX_ATOMIC_T_LEN); |
| |
| if (r->headers_out.content_type.data == NULL) { |
| return NGX_ERROR; |
| } |
| |
| /* "Content-Type: multipart/byteranges; boundary=0123456789" */ |
| |
| r->headers_out.content_type.len = |
| ngx_sprintf(r->headers_out.content_type.data, |
| "multipart/byteranges; boundary=%0muA", |
| boundary) |
| - r->headers_out.content_type.data; |
| |
| |
| /* the size of the last boundary CRLF "--0123456789--" CRLF */ |
| |
| len = sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN + sizeof("--" CRLF) - 1; |
| |
| range = r->headers_out.ranges.elts; |
| for (i = 0; i < r->headers_out.ranges.nelts; i++) { |
| |
| /* the size of the range: "SSSS-EEEE/TTTT" CRLF CRLF */ |
| |
| range[i].content_range.data = |
| ngx_palloc(r->pool, 3 * NGX_OFF_T_LEN + 2 + 4); |
| |
| if (range[i].content_range.data == NULL) { |
| return NGX_ERROR; |
| } |
| |
| range[i].content_range.len = ngx_sprintf(range[i].content_range.data, |
| "%O-%O/%O" CRLF CRLF, |
| range[i].start, range[i].end - 1, |
| r->headers_out.content_length_n) |
| - range[i].content_range.data; |
| |
| len += ctx->boundary_header.len + range[i].content_range.len |
| + (size_t) (range[i].end - range[i].start); |
| } |
| |
| r->headers_out.content_length_n = len; |
| r->headers_out.content_length = NULL; |
| |
| return ngx_http_next_header_filter(r); |
| } |
| |
| |
| static ngx_int_t |
| ngx_http_range_body_filter(ngx_http_request_t *r, ngx_chain_t *in) |
| { |
| ngx_uint_t i; |
| ngx_buf_t *b; |
| ngx_chain_t *out, *hcl, *rcl, *dcl, **ll; |
| ngx_http_range_t *range; |
| ngx_http_range_filter_ctx_t *ctx; |
| |
| if (r->headers_out.ranges.nelts == 0) { |
| return ngx_http_next_body_filter(r, in); |
| } |
| |
| /* |
| * the optimized version for the static files only |
| * that are passed in the single file buf |
| */ |
| |
| if (in && in->buf->in_file && in->buf->last_buf) { |
| range = r->headers_out.ranges.elts; |
| |
| if (r->headers_out.ranges.nelts == 1) { |
| in->buf->file_pos = range->start; |
| in->buf->file_last = range->end; |
| |
| return ngx_http_next_body_filter(r, in); |
| } |
| |
| ctx = ngx_http_get_module_ctx(r, ngx_http_range_body_filter_module); |
| ll = &out; |
| |
| for (i = 0; i < r->headers_out.ranges.nelts; i++) { |
| |
| /* |
| * The boundary header of the range: |
| * CRLF |
| * "--0123456789" CRLF |
| * "Content-Type: image/jpeg" CRLF |
| * "Content-Range: bytes " |
| */ |
| |
| b = ngx_calloc_buf(r->pool); |
| if (b == NULL) { |
| return NGX_ERROR; |
| } |
| |
| b->memory = 1; |
| b->pos = ctx->boundary_header.data; |
| b->last = ctx->boundary_header.data + ctx->boundary_header.len; |
| |
| hcl = ngx_alloc_chain_link(r->pool); |
| if (hcl == NULL) { |
| return NGX_ERROR; |
| } |
| |
| hcl->buf = b; |
| |
| |
| /* "SSSS-EEEE/TTTT" CRLF CRLF */ |
| |
| b = ngx_calloc_buf(r->pool); |
| if (b == NULL) { |
| return NGX_ERROR; |
| } |
| |
| b->temporary = 1; |
| b->pos = range[i].content_range.data; |
| b->last = range[i].content_range.data + range[i].content_range.len; |
| |
| rcl = ngx_alloc_chain_link(r->pool); |
| if (rcl == NULL) { |
| return NGX_ERROR; |
| } |
| |
| rcl->buf = b; |
| |
| |
| /* the range data */ |
| |
| b = ngx_calloc_buf(r->pool); |
| if (b == NULL) { |
| return NGX_ERROR; |
| } |
| |
| b->in_file = 1; |
| b->file_pos = range[i].start; |
| b->file_last = range[i].end; |
| b->file = in->buf->file; |
| |
| dcl = ngx_alloc_chain_link(r->pool); |
| if (dcl == NULL) { |
| return NGX_ERROR; |
| } |
| |
| dcl->buf = b; |
| |
| *ll = hcl; |
| hcl->next = rcl; |
| rcl->next = dcl; |
| ll = &dcl->next; |
| } |
| |
| /* the last boundary CRLF "--0123456789--" CRLF */ |
| |
| b = ngx_calloc_buf(r->pool); |
| if (b == NULL) { |
| return NGX_ERROR; |
| } |
| |
| b->temporary = 1; |
| b->last_buf = 1; |
| |
| b->pos = ngx_palloc(r->pool, sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN |
| + sizeof("--" CRLF) - 1); |
| if (b->pos == NULL) { |
| return NGX_ERROR; |
| } |
| |
| b->last = ngx_cpymem(b->pos, ctx->boundary_header.data, 4 + 10); |
| *b->last++ = '-'; *b->last++ = '-'; |
| *b->last++ = CR; *b->last++ = LF; |
| |
| hcl = ngx_alloc_chain_link(r->pool); |
| if (hcl == NULL) { |
| return NGX_ERROR; |
| } |
| |
| hcl->buf = b; |
| hcl->next = NULL; |
| |
| *ll = hcl; |
| |
| return ngx_http_next_body_filter(r, out); |
| } |
| |
| /* TODO: alert */ |
| |
| return ngx_http_next_body_filter(r, in); |
| } |
| |
| |
| static ngx_int_t |
| ngx_http_range_header_filter_init(ngx_cycle_t *cycle) |
| { |
| ngx_http_next_header_filter = ngx_http_top_header_filter; |
| ngx_http_top_header_filter = ngx_http_range_header_filter; |
| |
| return NGX_OK; |
| } |
| |
| |
| static ngx_int_t |
| ngx_http_range_body_filter_init(ngx_cycle_t *cycle) |
| { |
| ngx_http_next_body_filter = ngx_http_top_body_filter; |
| ngx_http_top_body_filter = ngx_http_range_body_filter; |
| |
| return NGX_OK; |
| } |