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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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58
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57 NULL, /* preconfiguration */
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58 NULL, /* postconfiguration */
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50
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59
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60 NULL, /* create main configuration */
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61 NULL, /* init main configuration */
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62
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63 NULL, /* create server configuration */
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64 NULL, /* merge server configuration */
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65
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66 NULL, /* create location configuration */
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67 NULL, /* merge location configuration */
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68 };
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69
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70
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71 ngx_module_t ngx_http_range_header_filter_module = {
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58
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72 NGX_MODULE_V1,
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73 &ngx_http_range_header_filter_module_ctx, /* module context */
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74 NULL, /* module directives */
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75 NGX_HTTP_MODULE, /* module type */
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90
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76 NULL, /* init master */
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77 ngx_http_range_header_filter_init, /* init module */
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90
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78 NULL, /* init process */
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79 NULL, /* init thread */
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80 NULL, /* exit thread */
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81 NULL, /* exit process */
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82 NULL, /* exit master */
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83 NGX_MODULE_V1_PADDING
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50
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84 };
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85
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86
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87 static ngx_http_module_t ngx_http_range_body_filter_module_ctx = {
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58
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88 NULL, /* preconfiguration */
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89 NULL, /* postconfiguration */
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90
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91 NULL, /* create main configuration */
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92 NULL, /* init main configuration */
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93
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94 NULL, /* create server configuration */
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95 NULL, /* merge server configuration */
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96
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97 NULL, /* create location configuration */
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98 NULL, /* merge location configuration */
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99 };
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100
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101
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102 ngx_module_t ngx_http_range_body_filter_module = {
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58
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103 NGX_MODULE_V1,
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104 &ngx_http_range_body_filter_module_ctx, /* module context */
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105 NULL, /* module directives */
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106 NGX_HTTP_MODULE, /* module type */
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90
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107 NULL, /* init master */
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108 ngx_http_range_body_filter_init, /* init module */
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90
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109 NULL, /* init process */
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110 NULL, /* init thread */
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111 NULL, /* exit thread */
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112 NULL, /* exit process */
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113 NULL, /* exit master */
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114 NGX_MODULE_V1_PADDING
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50
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115 };
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116
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117
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118 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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119 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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120
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121
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122 static ngx_int_t
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123 ngx_http_range_header_filter(ngx_http_request_t *r)
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124 {
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125 u_char *p;
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126 size_t len;
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127 off_t start, end;
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128 ngx_int_t rc;
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129 ngx_uint_t suffix, i;
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130 ngx_atomic_uint_t boundary;
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131 ngx_table_elt_t *content_range;
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132 ngx_http_range_t *range;
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133 ngx_http_range_filter_ctx_t *ctx;
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134
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135 if (r->http_version < NGX_HTTP_VERSION_10
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136 || r->headers_out.status != NGX_HTTP_OK
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146
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137 || r != r->main
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138 || r->headers_out.content_length_n == -1
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130
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139 || !r->allow_ranges)
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140 {
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141 return ngx_http_next_header_filter(r);
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142 }
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143
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144 if (r->headers_in.range == NULL
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145 || r->headers_in.range->value.len < 7
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146 || ngx_strncasecmp(r->headers_in.range->value.data, "bytes=", 6) != 0)
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147 {
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148
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149 r->headers_out.accept_ranges = ngx_list_push(&r->headers_out.headers);
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150 if (r->headers_out.accept_ranges == NULL) {
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151 return NGX_ERROR;
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152 }
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153
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58
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154 r->headers_out.accept_ranges->hash = 1;
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155 r->headers_out.accept_ranges->key.len = sizeof("Accept-Ranges") - 1;
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156 r->headers_out.accept_ranges->key.data = (u_char *) "Accept-Ranges";
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157 r->headers_out.accept_ranges->value.len = sizeof("bytes") - 1;
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158 r->headers_out.accept_ranges->value.data = (u_char *) "bytes";
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159
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160 return ngx_http_next_header_filter(r);
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161 }
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162
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163 if (ngx_array_init(&r->headers_out.ranges, r->pool, 2,
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164 sizeof(ngx_http_range_t)) == NGX_ERROR)
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165 {
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166 return NGX_ERROR;
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167 }
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168
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169 rc = 0;
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170 range = NULL;
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171 p = r->headers_in.range->value.data + 6;
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172
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173 for ( ;; ) {
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174 start = 0;
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175 end = 0;
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176 suffix = 0;
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177
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178 while (*p == ' ') { p++; }
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179
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180 if (*p != '-') {
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181 if (*p < '0' || *p > '9') {
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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 >= '0' && *p <= '9') {
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187 start = start * 10 + *p++ - '0';
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188 }
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189
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190 while (*p == ' ') { p++; }
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191
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192 if (*p++ != '-') {
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193 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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194 break;
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195 }
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196
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197 if (start >= r->headers_out.content_length_n) {
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198 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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199 break;
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200 }
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201
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202 while (*p == ' ') { p++; }
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203
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204 if (*p == ',' || *p == '\0') {
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205 range = ngx_array_push(&r->headers_out.ranges);
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206 if (range == NULL) {
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207 return NGX_ERROR;
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208 }
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209
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210 range->start = start;
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211 range->end = r->headers_out.content_length_n;
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212
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213 if (*p++ != ',') {
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214 break;
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215 }
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216
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217 continue;
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218 }
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219
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220 } else {
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221 suffix = 1;
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222 p++;
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223 }
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224
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225 if (*p < '0' || *p > '9') {
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226 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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227 break;
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228 }
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229
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230 while (*p >= '0' && *p <= '9') {
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231 end = end * 10 + *p++ - '0';
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232 }
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233
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234 while (*p == ' ') { p++; }
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235
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236 if (*p != ',' && *p != '\0') {
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237 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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238 break;
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239 }
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240
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241 if (suffix) {
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242 start = r->headers_out.content_length_n - end;
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243 end = r->headers_out.content_length_n - 1;
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244 }
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245
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246 if (start > end) {
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247 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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248 break;
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249 }
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250
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251 range = ngx_array_push(&r->headers_out.ranges);
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252 if (range == NULL) {
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253 return NGX_ERROR;
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254 }
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255
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256 range->start = start;
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257
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258 if (end >= r->headers_out.content_length_n) {
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259 /*
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260 * Download Accelerator sends the last byte position
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261 * that equals to the file length
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262 */
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263 range->end = r->headers_out.content_length_n;
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264
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265 } else {
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266 range->end = end + 1;
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267 }
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268
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269 if (*p++ != ',') {
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270 break;
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271 }
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272 }
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273
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274 if (rc) {
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275
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276 /* rc == NGX_HTTP_RANGE_NOT_SATISFIABLE */
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277
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278 r->headers_out.status = rc;
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279 r->headers_out.ranges.nelts = 0;
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280
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281 content_range = ngx_list_push(&r->headers_out.headers);
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282 if (content_range == NULL) {
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283 return NGX_ERROR;
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284 }
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285
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286 r->headers_out.content_range = content_range;
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287
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288 content_range->hash = 1;
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289 content_range->key.len = sizeof("Content-Range") - 1;
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290 content_range->key.data = (u_char *) "Content-Range";
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291
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292 content_range->value.data = ngx_palloc(r->pool,
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293 sizeof("bytes */") - 1 + NGX_OFF_T_LEN);
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294 if (content_range->value.data == NULL) {
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295 return NGX_ERROR;
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296 }
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297
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298 content_range->value.len = ngx_sprintf(content_range->value.data,
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299 "bytes */%O",
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300 r->headers_out.content_length_n)
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301 - content_range->value.data;
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302
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126
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303 ngx_http_clear_content_length(r);
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304
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305 return rc;
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306 }
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307
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308 r->headers_out.status = NGX_HTTP_PARTIAL_CONTENT;
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309
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310 if (r->headers_out.ranges.nelts == 1) {
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311
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312 content_range = ngx_list_push(&r->headers_out.headers);
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313 if (content_range == NULL) {
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314 return NGX_ERROR;
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315 }
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316
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317 r->headers_out.content_range = content_range;
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318
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319 content_range->hash = 1;
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320 content_range->key.len = sizeof("Content-Range") - 1;
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321 content_range->key.data = (u_char *) "Content-Range";
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322
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323 content_range->value.data =
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324 ngx_palloc(r->pool, sizeof("bytes -/") - 1 + 3 * NGX_OFF_T_LEN);
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325 if (content_range->value.data == NULL) {
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326 return NGX_ERROR;
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327 }
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328
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329 /* "Content-Range: bytes SSSS-EEEE/TTTT" header */
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330
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331 content_range->value.len = ngx_sprintf(content_range->value.data,
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332 "bytes %O-%O/%O",
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333 range->start, range->end - 1,
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334 r->headers_out.content_length_n)
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335 - content_range->value.data;
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336
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337 r->headers_out.content_length_n = range->end - range->start;
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338
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339 return ngx_http_next_header_filter(r);
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340 }
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341
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342
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343 /* TODO: what if no content_type ?? */
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344
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345 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_range_filter_ctx_t));
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346 if (ctx == NULL) {
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347 return NGX_ERROR;
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348 }
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126
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349
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350 ngx_http_set_ctx(r, ctx, ngx_http_range_body_filter_module);
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351
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352
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353 len = sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN
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354 + sizeof(CRLF "Content-Type: ") - 1
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58
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355 + r->headers_out.content_type.len
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356 + sizeof(CRLF "Content-Range: bytes ") - 1;
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357
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358 if (r->headers_out.charset.len) {
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359 len += sizeof("; charset=") - 1 + r->headers_out.charset.len;
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360 }
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361
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362 ctx->boundary_header.data = ngx_palloc(r->pool, len);
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363 if (ctx->boundary_header.data == NULL) {
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364 return NGX_ERROR;
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365 }
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366
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367 boundary = ngx_next_temp_number(0);
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368
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369 /*
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370 * The boundary header of the range:
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371 * CRLF
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372 * "--0123456789" CRLF
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373 * "Content-Type: image/jpeg" CRLF
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374 * "Content-Range: bytes "
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375 */
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376
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377 if (r->headers_out.charset.len) {
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378 ctx->boundary_header.len = ngx_sprintf(ctx->boundary_header.data,
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379 CRLF "--%0muA" CRLF
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380 "Content-Type: %V; charset=%V" CRLF
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381 "Content-Range: bytes ",
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382 boundary,
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58
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383 &r->headers_out.content_type,
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50
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384 &r->headers_out.charset)
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385 - ctx->boundary_header.data;
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386
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387 r->headers_out.charset.len = 0;
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388
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389 } else {
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390 ctx->boundary_header.len = ngx_sprintf(ctx->boundary_header.data,
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391 CRLF "--%0muA" CRLF
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392 "Content-Type: %V" CRLF
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393 "Content-Range: bytes ",
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394 boundary,
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58
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395 &r->headers_out.content_type)
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396 - ctx->boundary_header.data;
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397 }
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398
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58
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399 r->headers_out.content_type.data =
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400 ngx_palloc(r->pool,
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401 sizeof("Content-Type: multipart/byteranges; boundary=") - 1
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402 + NGX_ATOMIC_T_LEN);
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50
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403
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58
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404 if (r->headers_out.content_type.data == NULL) {
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50
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405 return NGX_ERROR;
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406 }
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407
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408 /* "Content-Type: multipart/byteranges; boundary=0123456789" */
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409
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58
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410 r->headers_out.content_type.len =
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411 ngx_sprintf(r->headers_out.content_type.data,
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50
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412 "multipart/byteranges; boundary=%0muA",
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413 boundary)
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58
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414 - r->headers_out.content_type.data;
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50
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415
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416
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417 /* the size of the last boundary CRLF "--0123456789--" CRLF */
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418
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419 len = sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN + sizeof("--" CRLF) - 1;
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420
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421 range = r->headers_out.ranges.elts;
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422 for (i = 0; i < r->headers_out.ranges.nelts; i++) {
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423
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424 /* the size of the range: "SSSS-EEEE/TTTT" CRLF CRLF */
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425
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426 range[i].content_range.data =
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427 ngx_palloc(r->pool, 3 * NGX_OFF_T_LEN + 2 + 4);
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428
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|
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429 if (range[i].content_range.data == NULL) {
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430 return NGX_ERROR;
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431 }
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|
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432
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433 range[i].content_range.len = ngx_sprintf(range[i].content_range.data,
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434 "%O-%O/%O" CRLF CRLF,
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435 range[i].start, range[i].end - 1,
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436 r->headers_out.content_length_n)
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437 - range[i].content_range.data;
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|
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438
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439 len += ctx->boundary_header.len + range[i].content_range.len
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440 + (size_t) (range[i].end - range[i].start);
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|
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441 }
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442
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443 r->headers_out.content_length_n = len;
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444 r->headers_out.content_length = NULL;
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445
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446 return ngx_http_next_header_filter(r);
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447 }
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|
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448
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449
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|
|
450 static ngx_int_t
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|
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451 ngx_http_range_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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452 {
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|
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453 ngx_uint_t i;
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454 ngx_buf_t *b;
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|
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455 ngx_chain_t *out, *hcl, *rcl, *dcl, **ll;
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456 ngx_http_range_t *range;
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|
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457 ngx_http_range_filter_ctx_t *ctx;
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|
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458
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459 if (r->headers_out.ranges.nelts == 0) {
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|
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460 return ngx_http_next_body_filter(r, in);
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|
|
461 }
|
|
|
462
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|
|
463 /*
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464 * the optimized version for the static files only
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|
|
465 * that are passed in the single file buf
|
|
|
466 */
|
|
|
467
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|
|
468 if (in && in->buf->in_file && in->buf->last_buf) {
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|
|
469 range = r->headers_out.ranges.elts;
|
|
|
470
|
|
|
471 if (r->headers_out.ranges.nelts == 1) {
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|
|
472 in->buf->file_pos = range->start;
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|
|
473 in->buf->file_last = range->end;
|
|
|
474
|
|
|
475 return ngx_http_next_body_filter(r, in);
|
|
|
476 }
|
|
|
477
|
|
|
478 ctx = ngx_http_get_module_ctx(r, ngx_http_range_body_filter_module);
|
|
|
479 ll = &out;
|
|
|
480
|
|
|
481 for (i = 0; i < r->headers_out.ranges.nelts; i++) {
|
|
|
482
|
|
|
483 /*
|
|
|
484 * The boundary header of the range:
|
|
|
485 * CRLF
|
|
|
486 * "--0123456789" CRLF
|
|
|
487 * "Content-Type: image/jpeg" CRLF
|
|
|
488 * "Content-Range: bytes "
|
|
|
489 */
|
|
|
490
|
|
|
491 b = ngx_calloc_buf(r->pool);
|
|
|
492 if (b == NULL) {
|
|
|
493 return NGX_ERROR;
|
|
|
494 }
|
|
|
495
|
|
|
496 b->memory = 1;
|
|
|
497 b->pos = ctx->boundary_header.data;
|
|
|
498 b->last = ctx->boundary_header.data + ctx->boundary_header.len;
|
|
|
499
|
|
|
500 hcl = ngx_alloc_chain_link(r->pool);
|
|
|
501 if (hcl == NULL) {
|
|
|
502 return NGX_ERROR;
|
|
|
503 }
|
|
|
504
|
|
|
505 hcl->buf = b;
|
|
|
506
|
|
|
507
|
|
|
508 /* "SSSS-EEEE/TTTT" CRLF CRLF */
|
|
|
509
|
|
|
510 b = ngx_calloc_buf(r->pool);
|
|
|
511 if (b == NULL) {
|
|
|
512 return NGX_ERROR;
|
|
|
513 }
|
|
|
514
|
|
|
515 b->temporary = 1;
|
|
|
516 b->pos = range[i].content_range.data;
|
|
|
517 b->last = range[i].content_range.data + range[i].content_range.len;
|
|
|
518
|
|
|
519 rcl = ngx_alloc_chain_link(r->pool);
|
|
|
520 if (rcl == NULL) {
|
|
|
521 return NGX_ERROR;
|
|
|
522 }
|
|
|
523
|
|
|
524 rcl->buf = b;
|
|
|
525
|
|
|
526
|
|
|
527 /* the range data */
|
|
|
528
|
|
|
529 b = ngx_calloc_buf(r->pool);
|
|
|
530 if (b == NULL) {
|
|
|
531 return NGX_ERROR;
|
|
|
532 }
|
|
|
533
|
|
|
534 b->in_file = 1;
|
|
|
535 b->file_pos = range[i].start;
|
|
|
536 b->file_last = range[i].end;
|
|
|
537 b->file = in->buf->file;
|
|
|
538
|
|
|
539 dcl = ngx_alloc_chain_link(r->pool);
|
|
|
540 if (dcl == NULL) {
|
|
|
541 return NGX_ERROR;
|
|
|
542 }
|
|
|
543
|
|
|
544 dcl->buf = b;
|
|
|
545
|
|
|
546 *ll = hcl;
|
|
|
547 hcl->next = rcl;
|
|
|
548 rcl->next = dcl;
|
|
|
549 ll = &dcl->next;
|
|
|
550 }
|
|
|
551
|
|
|
552 /* the last boundary CRLF "--0123456789--" CRLF */
|
|
|
553
|
|
|
554 b = ngx_calloc_buf(r->pool);
|
|
|
555 if (b == NULL) {
|
|
|
556 return NGX_ERROR;
|
|
|
557 }
|
|
|
558
|
|
|
559 b->temporary = 1;
|
|
|
560 b->last_buf = 1;
|
|
|
561
|
|
|
562 b->pos = ngx_palloc(r->pool, sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN
|
|
|
563 + sizeof("--" CRLF) - 1);
|
|
|
564 if (b->pos == NULL) {
|
|
|
565 return NGX_ERROR;
|
|
|
566 }
|
|
|
567
|
|
|
568 b->last = ngx_cpymem(b->pos, ctx->boundary_header.data, 4 + 10);
|
|
|
569 *b->last++ = '-'; *b->last++ = '-';
|
|
|
570 *b->last++ = CR; *b->last++ = LF;
|
|
|
571
|
|
|
572 hcl = ngx_alloc_chain_link(r->pool);
|
|
|
573 if (hcl == NULL) {
|
|
|
574 return NGX_ERROR;
|
|
|
575 }
|
|
|
576
|
|
|
577 hcl->buf = b;
|
|
|
578 hcl->next = NULL;
|
|
|
579
|
|
|
580 *ll = hcl;
|
|
|
581
|
|
|
582 return ngx_http_next_body_filter(r, out);
|
|
|
583 }
|
|
|
584
|
|
|
585 /* TODO: alert */
|
|
|
586
|
|
|
587 return ngx_http_next_body_filter(r, in);
|
|
|
588 }
|
|
|
589
|
|
|
590
|
|
|
591 static ngx_int_t
|
|
|
592 ngx_http_range_header_filter_init(ngx_cycle_t *cycle)
|
|
|
593 {
|
|
|
594 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
595 ngx_http_top_header_filter = ngx_http_range_header_filter;
|
|
|
596
|
|
|
597 return NGX_OK;
|
|
|
598 }
|
|
|
599
|
|
|
600
|
|
|
601 static ngx_int_t
|
|
|
602 ngx_http_range_body_filter_init(ngx_cycle_t *cycle)
|
|
|
603 {
|
|
|
604 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
|
605 ngx_http_top_body_filter = ngx_http_range_body_filter;
|
|
|
606
|
|
|
607 return NGX_OK;
|
|
|
608 }
|
