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0
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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 child */
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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 child */
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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 ngx_http_range_header_filter(ngx_http_request_t *r)
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109 {
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110 u_char *p;
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111 size_t len;
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112 off_t start, end;
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10
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113 ngx_int_t rc;
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114 uint32_t boundary;
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115 ngx_uint_t suffix, i;
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116 ngx_table_elt_t *content_range;
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0
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117 ngx_http_range_t *range;
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118 ngx_http_range_filter_ctx_t *ctx;
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119
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120 if (r->http_version < NGX_HTTP_VERSION_10
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121 || r->headers_out.status != NGX_HTTP_OK
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122 || r->headers_out.content_length_n == -1
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123 || !r->filter_allow_ranges)
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124 {
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125 return ngx_http_next_header_filter(r);
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126 }
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127
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128 if (r->headers_in.range == NULL
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129 || r->headers_in.range->value.len < 7
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130 || ngx_strncasecmp(r->headers_in.range->value.data, "bytes=", 6) != 0)
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131 {
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132
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133 r->headers_out.accept_ranges = ngx_list_push(&r->headers_out.headers);
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134 if (r->headers_out.accept_ranges == NULL) {
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135 return NGX_ERROR;
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136 }
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137
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138 r->headers_out.accept_ranges->key.len = sizeof("Accept-Ranges") - 1;
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139 r->headers_out.accept_ranges->key.data = (u_char *) "Accept-Ranges";
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140 r->headers_out.accept_ranges->value.len = sizeof("bytes") - 1;
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141 r->headers_out.accept_ranges->value.data = (u_char *) "bytes";
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142
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143 return ngx_http_next_header_filter(r);
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144 }
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145
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10
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146 if (ngx_array_init(&r->headers_out.ranges, r->pool, 5,
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147 sizeof(ngx_http_range_t)) == NGX_ERROR)
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148 {
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149 return NGX_ERROR;
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150 }
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0
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151
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152 rc = 0;
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153 range = NULL;
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154 p = r->headers_in.range->value.data + 6;
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155
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156 for ( ;; ) {
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157 start = 0;
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158 end = 0;
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159 suffix = 0;
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160
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161 while (*p == ' ') { p++; }
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162
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163 if (*p != '-') {
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164 if (*p < '0' || *p > '9') {
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165 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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166 break;
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167 }
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168
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169 while (*p >= '0' && *p <= '9') {
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170 start = start * 10 + *p++ - '0';
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171 }
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172
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173 while (*p == ' ') { p++; }
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174
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175 if (*p++ != '-') {
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176 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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177 break;
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178 }
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179
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180 if (start >= r->headers_out.content_length_n) {
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181 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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182 break;
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183 }
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184
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185 while (*p == ' ') { p++; }
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186
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187 if (*p == ',' || *p == '\0') {
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10
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188 if (!(range = ngx_array_push(&r->headers_out.ranges))) {
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189 return NGX_ERROR;
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190 }
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191
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0
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192 range->start = start;
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193 range->end = r->headers_out.content_length_n;
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194
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195 if (*p++ != ',') {
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196 break;
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197 }
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198
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199 continue;
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200 }
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201
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202 } else {
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203 suffix = 1;
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204 p++;
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205 }
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206
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207 if (*p < '0' || *p > '9') {
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208 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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209 break;
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210 }
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211
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212 while (*p >= '0' && *p <= '9') {
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213 end = end * 10 + *p++ - '0';
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214 }
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215
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216 while (*p == ' ') { p++; }
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217
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218 if (*p != ',' && *p != '\0') {
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219 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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220 break;
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221 }
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222
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223 if (suffix) {
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224 start = r->headers_out.content_length_n - end;
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225 end = r->headers_out.content_length_n - 1;
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226 }
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227
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228 if (start > end) {
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229 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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230 break;
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231 }
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232
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10
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233 if (!(range = ngx_array_push(&r->headers_out.ranges))) {
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234 return NGX_ERROR;
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235 }
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236
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0
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237 range->start = start;
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238
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239 if (end >= r->headers_out.content_length_n) {
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240 /*
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241 * Download Accelerator sends the last byte position
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242 * that equals to the file length
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243 */
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244 range->end = r->headers_out.content_length_n;
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245
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246 } else {
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247 range->end = end + 1;
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248 }
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249
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250 if (*p++ != ',') {
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251 break;
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252 }
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253 }
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254
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255 if (rc) {
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256
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257 /* rc == NGX_HTTP_RANGE_NOT_SATISFIABLE */
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258
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259 r->headers_out.status = rc;
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260 r->headers_out.ranges.nelts = 0;
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261
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10
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262 if (!(content_range = ngx_list_push(&r->headers_out.headers))) {
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0
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263 return NGX_ERROR;
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264 }
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265
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10
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266 r->headers_out.content_range = content_range;
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267
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268 content_range->key.len = sizeof("Content-Range") - 1;
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269 content_range->key.data = (u_char *) "Content-Range";
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0
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270
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10
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271 content_range->value.data =
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272 ngx_palloc(r->pool, sizeof("bytes */") - 1 + NGX_OFF_T_LEN);
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273
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274 if (content_range->value.data == NULL) {
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0
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275 return NGX_ERROR;
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276 }
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277
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10
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278 content_range->value.len = ngx_sprintf(content_range->value.data,
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279 "bytes */%O",
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280 r->headers_out.content_length_n)
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281 - content_range->value.data;
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0
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282
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283 r->headers_out.content_length_n = -1;
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284 if (r->headers_out.content_length) {
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285 r->headers_out.content_length->key.len = 0;
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286 r->headers_out.content_length = NULL;
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287 }
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288
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289 return rc;
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10
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290 }
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291
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292 r->headers_out.status = NGX_HTTP_PARTIAL_CONTENT;
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293
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294 if (r->headers_out.ranges.nelts == 1) {
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295
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296 if (!(content_range = ngx_list_push(&r->headers_out.headers))) {
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297 return NGX_ERROR;
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298 }
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299
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300 r->headers_out.content_range = content_range;
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301
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302 content_range->key.len = sizeof("Content-Range") - 1;
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303 content_range->key.data = (u_char *) "Content-Range";
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304
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305 content_range->value.data =
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306 ngx_palloc(r->pool, sizeof("bytes -/") - 1 + 3 * NGX_OFF_T_LEN);
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307 if (content_range->value.data == NULL) {
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308 return NGX_ERROR;
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309 }
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310
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311 /* "Content-Range: bytes SSSS-EEEE/TTTT" header */
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312
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313 content_range->value.len = ngx_sprintf(content_range->value.data,
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314 "bytes %O-%O/%O",
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315 range->start, range->end - 1,
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316 r->headers_out.content_length_n)
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317 - content_range->value.data;
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318
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319 r->headers_out.content_length_n = range->end - range->start;
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320
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321 return ngx_http_next_header_filter(r);
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322 }
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323
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324
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325 /* TODO: what if no content_type ?? */
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326
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327 ngx_http_create_ctx(r, ctx, ngx_http_range_body_filter_module,
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328 sizeof(ngx_http_range_filter_ctx_t), NGX_ERROR);
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329
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330
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331 len = sizeof(CRLF "--0123456789" CRLF "Content-Type: ") - 1
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332 + r->headers_out.content_type->value.len
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333 + sizeof(CRLF "Content-Range: bytes ") - 1;
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334
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335 if (r->headers_out.charset.len) {
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336 len += sizeof("; charset=") - 1 + r->headers_out.charset.len;
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337 }
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338
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339 if (!(ctx->boundary_header.data = ngx_palloc(r->pool, len))) {
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340 return NGX_ERROR;
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341 }
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342
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16
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343 boundary = (uint32_t) ngx_next_temp_number(0);
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10
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344
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345 /*
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346 * The boundary header of the range:
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347 * CRLF
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348 * "--0123456789" CRLF
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349 * "Content-Type: image/jpeg" CRLF
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350 * "Content-Range: bytes "
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351 */
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352
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353 if (r->headers_out.charset.len) {
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354 ctx->boundary_header.len = ngx_sprintf(ctx->boundary_header.data,
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355 CRLF "--%010ud" CRLF
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356 "Content-Type: %V; charset=%V" CRLF
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357 "Content-Range: bytes ",
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358 boundary,
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359 &r->headers_out.content_type->value,
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360 &r->headers_out.charset)
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361 - ctx->boundary_header.data;
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362
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363 r->headers_out.charset.len = 0;
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0
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364
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365 } else {
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10
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366 ctx->boundary_header.len = ngx_sprintf(ctx->boundary_header.data,
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367 CRLF "--%010ud" CRLF
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368 "Content-Type: %V" CRLF
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369 "Content-Range: bytes ",
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370 boundary,
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371 &r->headers_out.content_type->value)
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372 - ctx->boundary_header.data;
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373 }
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0
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374
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10
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375 r->headers_out.content_type->value.data =
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376 ngx_palloc(r->pool, sizeof("Content-Type: multipart/byteranges; "
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377 "boundary=0123456789") - 1);
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0
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378
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10
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379 if (r->headers_out.content_type->value.data == NULL) {
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380 return NGX_ERROR;
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381 }
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0
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382
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10
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383 /* "Content-Type: multipart/byteranges; boundary=0123456789" */
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0
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384
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10
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385 r->headers_out.content_type->value.len =
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386 ngx_sprintf(r->headers_out.content_type->value.data,
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387 "multipart/byteranges; boundary=%010ud",
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388 boundary)
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389 - r->headers_out.content_type->value.data;
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0
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390
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10
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391 /* the size of the last boundary CRLF "--0123456789--" CRLF */
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392 len = sizeof(CRLF "--0123456789--" CRLF) - 1;
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0
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393
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10
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394 range = r->headers_out.ranges.elts;
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395 for (i = 0; i < r->headers_out.ranges.nelts; i++) {
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4
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396
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10
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397 /* the size of the range: "SSSS-EEEE/TTTT" CRLF CRLF */
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4
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398
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10
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399 range[i].content_range.data =
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400 ngx_palloc(r->pool, 3 * NGX_OFF_T_LEN + 2 + 4);
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0
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401
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10
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402 if (range[i].content_range.data == NULL) {
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403 return NGX_ERROR;
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404 }
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0
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405
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10
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406 range[i].content_range.len = ngx_sprintf(range[i].content_range.data,
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407 "%O-%O/%O" CRLF CRLF,
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408 range[i].start, range[i].end - 1,
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409 r->headers_out.content_length_n)
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410 - range[i].content_range.data;
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0
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411
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10
|
412 len += ctx->boundary_header.len + range[i].content_range.len
|
|
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413 + (size_t) (range[i].end - range[i].start);
|
|
|
414 }
|
|
0
|
415
|
|
10
|
416 r->headers_out.content_length_n = len;
|
|
|
417 r->headers_out.content_length = NULL;
|
|
0
|
418
|
|
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419 return ngx_http_next_header_filter(r);
|
|
|
420 }
|
|
|
421
|
|
|
422
|
|
|
423 static ngx_int_t ngx_http_range_body_filter(ngx_http_request_t *r,
|
|
|
424 ngx_chain_t *in)
|
|
|
425 {
|
|
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426 ngx_uint_t i;
|
|
|
427 ngx_buf_t *b;
|
|
|
428 ngx_chain_t *out, *hcl, *rcl, *dcl, **ll;
|
|
|
429 ngx_http_range_t *range;
|
|
|
430 ngx_http_range_filter_ctx_t *ctx;
|
|
|
431
|
|
|
432 if (r->headers_out.ranges.nelts == 0) {
|
|
|
433 return ngx_http_next_body_filter(r, in);
|
|
|
434 }
|
|
|
435
|
|
|
436 /*
|
|
|
437 * the optimized version for the static files only
|
|
|
438 * that are passed in the single file buf
|
|
|
439 */
|
|
|
440
|
|
|
441 if (in && in->buf->in_file && in->buf->last_buf) {
|
|
|
442 range = r->headers_out.ranges.elts;
|
|
|
443
|
|
|
444 if (r->headers_out.ranges.nelts == 1) {
|
|
|
445 in->buf->file_pos = range->start;
|
|
|
446 in->buf->file_last = range->end;
|
|
|
447
|
|
|
448 return ngx_http_next_body_filter(r, in);
|
|
|
449 }
|
|
|
450
|
|
|
451 ctx = ngx_http_get_module_ctx(r, ngx_http_range_body_filter_module);
|
|
|
452 ll = &out;
|
|
|
453
|
|
|
454 for (i = 0; i < r->headers_out.ranges.nelts; i++) {
|
|
|
455
|
|
|
456 /*
|
|
|
457 * The boundary header of the range:
|
|
|
458 * CRLF
|
|
|
459 * "--0123456789" CRLF
|
|
|
460 * "Content-Type: image/jpeg" CRLF
|
|
|
461 * "Content-Range: bytes "
|
|
|
462 */
|
|
|
463
|
|
10
|
464 if (!(b = ngx_calloc_buf(r->pool))) {
|
|
|
465 return NGX_ERROR;
|
|
|
466 }
|
|
|
467
|
|
0
|
468 b->memory = 1;
|
|
|
469 b->pos = ctx->boundary_header.data;
|
|
|
470 b->last = ctx->boundary_header.data + ctx->boundary_header.len;
|
|
|
471
|
|
10
|
472 if (!(hcl = ngx_alloc_chain_link(r->pool))) {
|
|
|
473 return NGX_ERROR;
|
|
|
474 }
|
|
|
475
|
|
0
|
476 hcl->buf = b;
|
|
|
477
|
|
10
|
478
|
|
0
|
479 /* "SSSS-EEEE/TTTT" CRLF CRLF */
|
|
|
480
|
|
10
|
481 if (!(b = ngx_calloc_buf(r->pool))) {
|
|
|
482 return NGX_ERROR;
|
|
|
483 }
|
|
|
484
|
|
0
|
485 b->temporary = 1;
|
|
|
486 b->pos = range[i].content_range.data;
|
|
|
487 b->last = range[i].content_range.data + range[i].content_range.len;
|
|
|
488
|
|
10
|
489 if (!(rcl = ngx_alloc_chain_link(r->pool))) {
|
|
|
490 return NGX_ERROR;
|
|
|
491 }
|
|
|
492
|
|
0
|
493 rcl->buf = b;
|
|
|
494
|
|
10
|
495
|
|
0
|
496 /* the range data */
|
|
|
497
|
|
10
|
498 if (!(b = ngx_calloc_buf(r->pool))) {
|
|
|
499 return NGX_ERROR;
|
|
|
500 }
|
|
|
501
|
|
0
|
502 b->in_file = 1;
|
|
|
503 b->file_pos = range[i].start;
|
|
|
504 b->file_last = range[i].end;
|
|
|
505 b->file = in->buf->file;
|
|
|
506
|
|
10
|
507 if (!(dcl = ngx_alloc_chain_link(r->pool))) {
|
|
|
508 return NGX_ERROR;
|
|
|
509 }
|
|
|
510
|
|
|
511 dcl->buf = b;
|
|
0
|
512
|
|
|
513 *ll = hcl;
|
|
|
514 hcl->next = rcl;
|
|
|
515 rcl->next = dcl;
|
|
|
516 ll = &dcl->next;
|
|
|
517 }
|
|
|
518
|
|
|
519 /* the last boundary CRLF "--0123456789--" CRLF */
|
|
|
520
|
|
10
|
521 if (!(b = ngx_calloc_buf(r->pool))) {
|
|
|
522 return NGX_ERROR;
|
|
|
523 }
|
|
|
524
|
|
0
|
525 b->temporary = 1;
|
|
|
526 b->last_buf = 1;
|
|
10
|
527
|
|
|
528 b->pos = ngx_palloc(r->pool, sizeof(CRLF "--0123456789--" CRLF) - 1);
|
|
|
529 if (b->pos == NULL) {
|
|
|
530 return NGX_ERROR;
|
|
|
531 }
|
|
|
532
|
|
0
|
533 b->last = ngx_cpymem(b->pos, ctx->boundary_header.data, 4 + 10);
|
|
|
534 *b->last++ = '-'; *b->last++ = '-';
|
|
|
535 *b->last++ = CR; *b->last++ = LF;
|
|
|
536
|
|
10
|
537 if (!(hcl = ngx_alloc_chain_link(r->pool))) {
|
|
|
538 return NGX_ERROR;
|
|
|
539 }
|
|
|
540
|
|
|
541 hcl->buf = b;
|
|
|
542 hcl->next = NULL;
|
|
|
543
|
|
0
|
544 *ll = hcl;
|
|
|
545
|
|
|
546 return ngx_http_next_body_filter(r, out);
|
|
|
547 }
|
|
|
548
|
|
|
549 /* TODO: alert */
|
|
|
550
|
|
|
551 return ngx_http_next_body_filter(r, in);
|
|
|
552 }
|
|
|
553
|
|
|
554
|
|
|
555 static ngx_int_t ngx_http_range_header_filter_init(ngx_cycle_t *cycle)
|
|
|
556 {
|
|
|
557 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
558 ngx_http_top_header_filter = ngx_http_range_header_filter;
|
|
|
559
|
|
|
560 return NGX_OK;
|
|
|
561 }
|
|
|
562
|
|
|
563
|
|
|
564 static ngx_int_t ngx_http_range_body_filter_init(ngx_cycle_t *cycle)
|
|
|
565 {
|
|
|
566 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
|
567 ngx_http_top_body_filter = ngx_http_range_body_filter;
|
|
|
568
|
|
|
569 return NGX_OK;
|
|
|
570 }
|
