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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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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 /*
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13 * the single part format:
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14 *
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15 * "HTTP/1.0 206 Partial Content" CRLF
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16 * ... header ...
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17 * "Content-Type: image/jpeg" CRLF
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18 * "Content-Length: SIZE" CRLF
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19 * "Content-Range: bytes START-END/SIZE" CRLF
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20 * CRLF
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21 * ... data ...
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22 *
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23 *
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24 * the mutlipart format:
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25 *
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26 * "HTTP/1.0 206 Partial Content" CRLF
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27 * ... header ...
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28 * "Content-Type: multipart/byteranges; boundary=0123456789" CRLF
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29 * CRLF
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30 * CRLF
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31 * "--0123456789" CRLF
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32 * "Content-Type: image/jpeg" CRLF
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33 * "Content-Range: bytes START0-END0/SIZE" CRLF
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34 * CRLF
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35 * ... data ...
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36 * CRLF
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37 * "--0123456789" CRLF
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38 * "Content-Type: image/jpeg" CRLF
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39 * "Content-Range: bytes START1-END1/SIZE" CRLF
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40 * CRLF
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41 * ... data ...
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42 * CRLF
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43 * "--0123456789--" CRLF
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44 */
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45
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46
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47 typedef struct {
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48 ngx_str_t boundary_header;
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49 } ngx_http_range_filter_ctx_t;
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50
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51
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52 static ngx_int_t ngx_http_range_header_filter_init(ngx_cycle_t *cycle);
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53 static ngx_int_t ngx_http_range_body_filter_init(ngx_cycle_t *cycle);
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54
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55
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56 static ngx_http_module_t ngx_http_range_header_filter_module_ctx = {
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57 NULL, /* pre conf */
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58
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59 NULL, /* create main configuration */
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60 NULL, /* init main configuration */
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61
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62 NULL, /* create server configuration */
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63 NULL, /* merge server configuration */
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64
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65 NULL, /* create location configuration */
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66 NULL, /* merge location configuration */
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67 };
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68
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69
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70 ngx_module_t ngx_http_range_header_filter_module = {
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71 NGX_MODULE,
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72 &ngx_http_range_header_filter_module_ctx, /* module context */
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73 NULL, /* module directives */
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74 NGX_HTTP_MODULE, /* module type */
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75 ngx_http_range_header_filter_init, /* init module */
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76 NULL /* init process */
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77 };
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78
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79
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80 static ngx_http_module_t ngx_http_range_body_filter_module_ctx = {
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81 NULL, /* pre conf */
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82
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83 NULL, /* create main configuration */
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84 NULL, /* init main configuration */
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85
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86 NULL, /* create server configuration */
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87 NULL, /* merge server configuration */
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88
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89 NULL, /* create location configuration */
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90 NULL, /* merge location configuration */
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91 };
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92
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93
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94 ngx_module_t ngx_http_range_body_filter_module = {
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95 NGX_MODULE,
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96 &ngx_http_range_body_filter_module_ctx, /* module context */
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97 NULL, /* module directives */
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98 NGX_HTTP_MODULE, /* module type */
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99 ngx_http_range_body_filter_init, /* init module */
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100 NULL /* init process */
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101 };
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102
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103
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104 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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105 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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106
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107
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108 static ngx_int_t
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109 ngx_http_range_header_filter(ngx_http_request_t *r)
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110 {
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111 u_char *p;
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112 size_t len;
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113 off_t start, end;
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114 ngx_int_t rc;
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115 ngx_uint_t suffix, i;
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116 ngx_atomic_uint_t boundary;
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117 ngx_table_elt_t *content_range;
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118 ngx_http_range_t *range;
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119 ngx_http_range_filter_ctx_t *ctx;
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120
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121 if (r->http_version < NGX_HTTP_VERSION_10
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122 || r->headers_out.status != NGX_HTTP_OK
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123 || r->headers_out.content_length_n == -1
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124 || !r->filter_allow_ranges)
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125 {
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126 return ngx_http_next_header_filter(r);
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127 }
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128
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129 if (r->headers_in.range == NULL
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130 || r->headers_in.range->value.len < 7
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131 || ngx_strncasecmp(r->headers_in.range->value.data, "bytes=", 6) != 0)
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132 {
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133
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134 r->headers_out.accept_ranges = ngx_list_push(&r->headers_out.headers);
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135 if (r->headers_out.accept_ranges == NULL) {
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136 return NGX_ERROR;
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137 }
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138
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139 r->headers_out.accept_ranges->key.len = sizeof("Accept-Ranges") - 1;
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140 r->headers_out.accept_ranges->key.data = (u_char *) "Accept-Ranges";
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141 r->headers_out.accept_ranges->value.len = sizeof("bytes") - 1;
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142 r->headers_out.accept_ranges->value.data = (u_char *) "bytes";
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143
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144 return ngx_http_next_header_filter(r);
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145 }
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146
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147 if (ngx_array_init(&r->headers_out.ranges, r->pool, 2,
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148 sizeof(ngx_http_range_t)) == NGX_ERROR)
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149 {
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150 return NGX_ERROR;
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151 }
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152
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153 rc = 0;
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154 range = NULL;
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155 p = r->headers_in.range->value.data + 6;
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156
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157 for ( ;; ) {
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158 start = 0;
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159 end = 0;
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160 suffix = 0;
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161
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162 while (*p == ' ') { p++; }
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163
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164 if (*p != '-') {
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165 if (*p < '0' || *p > '9') {
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166 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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167 break;
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168 }
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169
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170 while (*p >= '0' && *p <= '9') {
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171 start = start * 10 + *p++ - '0';
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172 }
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173
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174 while (*p == ' ') { p++; }
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175
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176 if (*p++ != '-') {
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177 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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178 break;
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179 }
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180
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181 if (start >= r->headers_out.content_length_n) {
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182 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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183 break;
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184 }
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185
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186 while (*p == ' ') { p++; }
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187
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188 if (*p == ',' || *p == '\0') {
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189 range = ngx_array_push(&r->headers_out.ranges);
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190 if (range == NULL) {
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191 return NGX_ERROR;
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192 }
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193
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194 range->start = start;
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195 range->end = r->headers_out.content_length_n;
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196
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197 if (*p++ != ',') {
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198 break;
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199 }
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200
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201 continue;
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202 }
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203
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204 } else {
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205 suffix = 1;
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206 p++;
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207 }
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208
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209 if (*p < '0' || *p > '9') {
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210 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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211 break;
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212 }
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213
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214 while (*p >= '0' && *p <= '9') {
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215 end = end * 10 + *p++ - '0';
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216 }
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217
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218 while (*p == ' ') { p++; }
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219
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220 if (*p != ',' && *p != '\0') {
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221 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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222 break;
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223 }
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224
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225 if (suffix) {
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226 start = r->headers_out.content_length_n - end;
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227 end = r->headers_out.content_length_n - 1;
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228 }
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229
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230 if (start > end) {
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231 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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232 break;
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233 }
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234
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235 range = ngx_array_push(&r->headers_out.ranges);
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236 if (range == NULL) {
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237 return NGX_ERROR;
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238 }
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239
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240 range->start = start;
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241
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242 if (end >= r->headers_out.content_length_n) {
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243 /*
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244 * Download Accelerator sends the last byte position
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245 * that equals to the file length
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246 */
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247 range->end = r->headers_out.content_length_n;
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248
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249 } else {
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250 range->end = end + 1;
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251 }
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252
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253 if (*p++ != ',') {
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254 break;
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255 }
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256 }
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257
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258 if (rc) {
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259
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260 /* rc == NGX_HTTP_RANGE_NOT_SATISFIABLE */
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261
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262 r->headers_out.status = rc;
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263 r->headers_out.ranges.nelts = 0;
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264
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265 content_range = ngx_list_push(&r->headers_out.headers);
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266 if (content_range == NULL) {
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267 return NGX_ERROR;
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268 }
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269
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270 r->headers_out.content_range = content_range;
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271
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272 content_range->key.len = sizeof("Content-Range") - 1;
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273 content_range->key.data = (u_char *) "Content-Range";
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274
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275 content_range->value.data = ngx_palloc(r->pool,
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276 sizeof("bytes */") - 1 + NGX_OFF_T_LEN);
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277 if (content_range->value.data == NULL) {
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278 return NGX_ERROR;
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279 }
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280
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281 content_range->value.len = ngx_sprintf(content_range->value.data,
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282 "bytes */%O",
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283 r->headers_out.content_length_n)
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284 - content_range->value.data;
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285
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286 r->headers_out.content_length_n = -1;
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287 if (r->headers_out.content_length) {
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288 r->headers_out.content_length->key.len = 0;
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289 r->headers_out.content_length = NULL;
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290 }
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291
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292 return rc;
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293 }
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294
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295 r->headers_out.status = NGX_HTTP_PARTIAL_CONTENT;
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296
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297 if (r->headers_out.ranges.nelts == 1) {
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298
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299 content_range = ngx_list_push(&r->headers_out.headers);
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300 if (content_range == NULL) {
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301 return NGX_ERROR;
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302 }
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303
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304 r->headers_out.content_range = content_range;
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305
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306 content_range->key.len = sizeof("Content-Range") - 1;
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307 content_range->key.data = (u_char *) "Content-Range";
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308
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309 content_range->value.data =
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310 ngx_palloc(r->pool, sizeof("bytes -/") - 1 + 3 * NGX_OFF_T_LEN);
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311 if (content_range->value.data == NULL) {
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312 return NGX_ERROR;
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313 }
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314
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315 /* "Content-Range: bytes SSSS-EEEE/TTTT" header */
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316
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317 content_range->value.len = ngx_sprintf(content_range->value.data,
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318 "bytes %O-%O/%O",
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319 range->start, range->end - 1,
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320 r->headers_out.content_length_n)
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321 - content_range->value.data;
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322
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323 r->headers_out.content_length_n = range->end - range->start;
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324
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325 return ngx_http_next_header_filter(r);
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326 }
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327
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328
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329 /* TODO: what if no content_type ?? */
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330
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331 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_range_filter_ctx_t));
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332 if (ctx == NULL) {
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333 return NGX_ERROR;
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334 }
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335
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336 ngx_http_set_ctx(r, ctx, ngx_http_range_body_filter_module);
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337
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338
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339 len = sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN
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340 + sizeof(CRLF "Content-Type: ") - 1
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341 + r->headers_out.content_type->value.len
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342 + sizeof(CRLF "Content-Range: bytes ") - 1;
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343
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344 if (r->headers_out.charset.len) {
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345 len += sizeof("; charset=") - 1 + r->headers_out.charset.len;
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346 }
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347
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348 ctx->boundary_header.data = ngx_palloc(r->pool, len);
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349 if (ctx->boundary_header.data == NULL) {
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350 return NGX_ERROR;
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351 }
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352
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353 boundary = ngx_next_temp_number(0);
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354
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355 /*
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356 * The boundary header of the range:
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357 * CRLF
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358 * "--0123456789" CRLF
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359 * "Content-Type: image/jpeg" CRLF
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360 * "Content-Range: bytes "
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361 */
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362
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363 if (r->headers_out.charset.len) {
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364 ctx->boundary_header.len = ngx_sprintf(ctx->boundary_header.data,
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365 CRLF "--%0muA" CRLF
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366 "Content-Type: %V; charset=%V" CRLF
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367 "Content-Range: bytes ",
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368 boundary,
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369 &r->headers_out.content_type->value,
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370 &r->headers_out.charset)
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371 - ctx->boundary_header.data;
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372
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373 r->headers_out.charset.len = 0;
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374
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375 } else {
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376 ctx->boundary_header.len = ngx_sprintf(ctx->boundary_header.data,
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377 CRLF "--%0muA" CRLF
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378 "Content-Type: %V" CRLF
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379 "Content-Range: bytes ",
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380 boundary,
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381 &r->headers_out.content_type->value)
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382 - ctx->boundary_header.data;
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383 }
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384
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385 r->headers_out.content_type->value.data =
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386 ngx_palloc(r->pool,
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387 sizeof("Content-Type: multipart/byteranges; boundary=") - 1
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388 + NGX_ATOMIC_T_LEN);
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389
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390 if (r->headers_out.content_type->value.data == NULL) {
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391 return NGX_ERROR;
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392 }
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393
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394 /* "Content-Type: multipart/byteranges; boundary=0123456789" */
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395
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396 r->headers_out.content_type->value.len =
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397 ngx_sprintf(r->headers_out.content_type->value.data,
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398 "multipart/byteranges; boundary=%0muA",
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399 boundary)
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400 - r->headers_out.content_type->value.data;
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401
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402
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403 /* the size of the last boundary CRLF "--0123456789--" CRLF */
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404
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405 len = sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN + sizeof("--" CRLF) - 1;
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406
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407 range = r->headers_out.ranges.elts;
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408 for (i = 0; i < r->headers_out.ranges.nelts; i++) {
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409
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410 /* the size of the range: "SSSS-EEEE/TTTT" CRLF CRLF */
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411
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412 range[i].content_range.data =
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413 ngx_palloc(r->pool, 3 * NGX_OFF_T_LEN + 2 + 4);
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414
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415 if (range[i].content_range.data == NULL) {
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416 return NGX_ERROR;
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417 }
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418
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419 range[i].content_range.len = ngx_sprintf(range[i].content_range.data,
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420 "%O-%O/%O" CRLF CRLF,
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421 range[i].start, range[i].end - 1,
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422 r->headers_out.content_length_n)
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423 - range[i].content_range.data;
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424
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425 len += ctx->boundary_header.len + range[i].content_range.len
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426 + (size_t) (range[i].end - range[i].start);
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427 }
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428
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429 r->headers_out.content_length_n = len;
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430 r->headers_out.content_length = NULL;
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431
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432 return ngx_http_next_header_filter(r);
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433 }
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434
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435
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436 static ngx_int_t
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437 ngx_http_range_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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438 {
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439 ngx_uint_t i;
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440 ngx_buf_t *b;
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441 ngx_chain_t *out, *hcl, *rcl, *dcl, **ll;
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442 ngx_http_range_t *range;
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443 ngx_http_range_filter_ctx_t *ctx;
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444
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445 if (r->headers_out.ranges.nelts == 0) {
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446 return ngx_http_next_body_filter(r, in);
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447 }
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448
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449 /*
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450 * the optimized version for the static files only
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451 * that are passed in the single file buf
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452 */
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453
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454 if (in && in->buf->in_file && in->buf->last_buf) {
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455 range = r->headers_out.ranges.elts;
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456
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457 if (r->headers_out.ranges.nelts == 1) {
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458 in->buf->file_pos = range->start;
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459 in->buf->file_last = range->end;
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|
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460
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461 return ngx_http_next_body_filter(r, in);
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|
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462 }
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|
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463
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464 ctx = ngx_http_get_module_ctx(r, ngx_http_range_body_filter_module);
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|
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465 ll = &out;
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|
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466
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467 for (i = 0; i < r->headers_out.ranges.nelts; i++) {
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468
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|
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469 /*
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470 * The boundary header of the range:
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471 * CRLF
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472 * "--0123456789" CRLF
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|
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473 * "Content-Type: image/jpeg" CRLF
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|
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474 * "Content-Range: bytes "
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|
|
475 */
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|
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476
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|
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477 b = ngx_calloc_buf(r->pool);
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|
|
478 if (b == NULL) {
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|
|
479 return NGX_ERROR;
|
|
|
480 }
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|
|
481
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|
|
482 b->memory = 1;
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|
|
483 b->pos = ctx->boundary_header.data;
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|
|
484 b->last = ctx->boundary_header.data + ctx->boundary_header.len;
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|
|
485
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|
|
486 hcl = ngx_alloc_chain_link(r->pool);
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|
|
487 if (hcl == NULL) {
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|
|
488 return NGX_ERROR;
|
|
|
489 }
|
|
|
490
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|
|
491 hcl->buf = b;
|
|
|
492
|
|
|
493
|
|
|
494 /* "SSSS-EEEE/TTTT" CRLF CRLF */
|
|
|
495
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|
|
496 b = ngx_calloc_buf(r->pool);
|
|
|
497 if (b == NULL) {
|
|
|
498 return NGX_ERROR;
|
|
|
499 }
|
|
|
500
|
|
|
501 b->temporary = 1;
|
|
|
502 b->pos = range[i].content_range.data;
|
|
|
503 b->last = range[i].content_range.data + range[i].content_range.len;
|
|
|
504
|
|
|
505 rcl = ngx_alloc_chain_link(r->pool);
|
|
|
506 if (rcl == NULL) {
|
|
|
507 return NGX_ERROR;
|
|
|
508 }
|
|
|
509
|
|
|
510 rcl->buf = b;
|
|
|
511
|
|
|
512
|
|
|
513 /* the range data */
|
|
|
514
|
|
|
515 b = ngx_calloc_buf(r->pool);
|
|
|
516 if (b == NULL) {
|
|
|
517 return NGX_ERROR;
|
|
|
518 }
|
|
|
519
|
|
|
520 b->in_file = 1;
|
|
|
521 b->file_pos = range[i].start;
|
|
|
522 b->file_last = range[i].end;
|
|
|
523 b->file = in->buf->file;
|
|
|
524
|
|
|
525 dcl = ngx_alloc_chain_link(r->pool);
|
|
|
526 if (dcl == NULL) {
|
|
|
527 return NGX_ERROR;
|
|
|
528 }
|
|
|
529
|
|
|
530 dcl->buf = b;
|
|
|
531
|
|
|
532 *ll = hcl;
|
|
|
533 hcl->next = rcl;
|
|
|
534 rcl->next = dcl;
|
|
|
535 ll = &dcl->next;
|
|
|
536 }
|
|
|
537
|
|
|
538 /* the last boundary CRLF "--0123456789--" CRLF */
|
|
|
539
|
|
|
540 b = ngx_calloc_buf(r->pool);
|
|
|
541 if (b == NULL) {
|
|
|
542 return NGX_ERROR;
|
|
|
543 }
|
|
|
544
|
|
|
545 b->temporary = 1;
|
|
|
546 b->last_buf = 1;
|
|
|
547
|
|
|
548 b->pos = ngx_palloc(r->pool, sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN
|
|
|
549 + sizeof("--" CRLF) - 1);
|
|
|
550 if (b->pos == NULL) {
|
|
|
551 return NGX_ERROR;
|
|
|
552 }
|
|
|
553
|
|
|
554 b->last = ngx_cpymem(b->pos, ctx->boundary_header.data, 4 + 10);
|
|
|
555 *b->last++ = '-'; *b->last++ = '-';
|
|
|
556 *b->last++ = CR; *b->last++ = LF;
|
|
|
557
|
|
|
558 hcl = ngx_alloc_chain_link(r->pool);
|
|
|
559 if (hcl == NULL) {
|
|
|
560 return NGX_ERROR;
|
|
|
561 }
|
|
|
562
|
|
|
563 hcl->buf = b;
|
|
|
564 hcl->next = NULL;
|
|
|
565
|
|
|
566 *ll = hcl;
|
|
|
567
|
|
|
568 return ngx_http_next_body_filter(r, out);
|
|
|
569 }
|
|
|
570
|
|
|
571 /* TODO: alert */
|
|
|
572
|
|
|
573 return ngx_http_next_body_filter(r, in);
|
|
|
574 }
|
|
|
575
|
|
|
576
|
|
|
577 static ngx_int_t
|
|
|
578 ngx_http_range_header_filter_init(ngx_cycle_t *cycle)
|
|
|
579 {
|
|
|
580 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
581 ngx_http_top_header_filter = ngx_http_range_header_filter;
|
|
|
582
|
|
|
583 return NGX_OK;
|
|
|
584 }
|
|
|
585
|
|
|
586
|
|
|
587 static ngx_int_t
|
|
|
588 ngx_http_range_body_filter_init(ngx_cycle_t *cycle)
|
|
|
589 {
|
|
|
590 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
|
591 ngx_http_top_body_filter = ngx_http_range_body_filter;
|
|
|
592
|
|
|
593 return NGX_OK;
|
|
|
594 }
|
