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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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48
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76 NULL /* init process */
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0
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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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48
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100 NULL /* init process */
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0
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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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42
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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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0
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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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10
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114 ngx_int_t rc;
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115 ngx_uint_t suffix, i;
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44
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116 ngx_atomic_uint_t boundary;
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10
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117 ngx_table_elt_t *content_range;
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0
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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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48
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147 if (ngx_array_init(&r->headers_out.ranges, r->pool, 2,
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10
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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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0
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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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10
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189 if (!(range = ngx_array_push(&r->headers_out.ranges))) {
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190 return NGX_ERROR;
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191 }
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192
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0
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193 range->start = start;
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194 range->end = r->headers_out.content_length_n;
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195
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196 if (*p++ != ',') {
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197 break;
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198 }
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199
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200 continue;
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201 }
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202
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203 } else {
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204 suffix = 1;
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205 p++;
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206 }
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207
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208 if (*p < '0' || *p > '9') {
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209 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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210 break;
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211 }
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212
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213 while (*p >= '0' && *p <= '9') {
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214 end = end * 10 + *p++ - '0';
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215 }
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216
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217 while (*p == ' ') { p++; }
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218
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219 if (*p != ',' && *p != '\0') {
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220 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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221 break;
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222 }
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223
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224 if (suffix) {
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225 start = r->headers_out.content_length_n - end;
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226 end = r->headers_out.content_length_n - 1;
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227 }
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228
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229 if (start > end) {
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230 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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231 break;
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232 }
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233
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10
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234 if (!(range = ngx_array_push(&r->headers_out.ranges))) {
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235 return NGX_ERROR;
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236 }
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237
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0
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238 range->start = start;
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239
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240 if (end >= r->headers_out.content_length_n) {
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241 /*
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242 * Download Accelerator sends the last byte position
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243 * that equals to the file length
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244 */
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245 range->end = r->headers_out.content_length_n;
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246
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247 } else {
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248 range->end = end + 1;
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249 }
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250
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251 if (*p++ != ',') {
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252 break;
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253 }
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254 }
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255
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256 if (rc) {
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257
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258 /* rc == NGX_HTTP_RANGE_NOT_SATISFIABLE */
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259
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260 r->headers_out.status = rc;
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261 r->headers_out.ranges.nelts = 0;
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262
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10
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263 if (!(content_range = ngx_list_push(&r->headers_out.headers))) {
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0
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264 return NGX_ERROR;
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265 }
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266
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10
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267 r->headers_out.content_range = content_range;
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268
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269 content_range->key.len = sizeof("Content-Range") - 1;
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270 content_range->key.data = (u_char *) "Content-Range";
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0
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271
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10
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272 content_range->value.data =
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273 ngx_palloc(r->pool, sizeof("bytes */") - 1 + NGX_OFF_T_LEN);
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274
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275 if (content_range->value.data == NULL) {
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0
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276 return NGX_ERROR;
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277 }
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278
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10
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279 content_range->value.len = ngx_sprintf(content_range->value.data,
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280 "bytes */%O",
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281 r->headers_out.content_length_n)
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282 - content_range->value.data;
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0
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283
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284 r->headers_out.content_length_n = -1;
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285 if (r->headers_out.content_length) {
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286 r->headers_out.content_length->key.len = 0;
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287 r->headers_out.content_length = NULL;
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288 }
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289
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290 return rc;
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10
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291 }
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292
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293 r->headers_out.status = NGX_HTTP_PARTIAL_CONTENT;
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294
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295 if (r->headers_out.ranges.nelts == 1) {
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296
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297 if (!(content_range = ngx_list_push(&r->headers_out.headers))) {
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298 return NGX_ERROR;
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299 }
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300
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301 r->headers_out.content_range = content_range;
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302
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303 content_range->key.len = sizeof("Content-Range") - 1;
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304 content_range->key.data = (u_char *) "Content-Range";
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305
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306 content_range->value.data =
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307 ngx_palloc(r->pool, sizeof("bytes -/") - 1 + 3 * NGX_OFF_T_LEN);
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308 if (content_range->value.data == NULL) {
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309 return NGX_ERROR;
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310 }
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311
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312 /* "Content-Range: bytes SSSS-EEEE/TTTT" header */
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313
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314 content_range->value.len = ngx_sprintf(content_range->value.data,
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315 "bytes %O-%O/%O",
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316 range->start, range->end - 1,
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317 r->headers_out.content_length_n)
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318 - content_range->value.data;
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319
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320 r->headers_out.content_length_n = range->end - range->start;
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321
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322 return ngx_http_next_header_filter(r);
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323 }
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324
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325
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326 /* TODO: what if no content_type ?? */
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327
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328 ngx_http_create_ctx(r, ctx, ngx_http_range_body_filter_module,
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329 sizeof(ngx_http_range_filter_ctx_t), NGX_ERROR);
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330
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331
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42
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332 len = sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN
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333 + sizeof(CRLF "Content-Type: ") - 1
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10
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334 + r->headers_out.content_type->value.len
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335 + sizeof(CRLF "Content-Range: bytes ") - 1;
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336
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337 if (r->headers_out.charset.len) {
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338 len += sizeof("; charset=") - 1 + r->headers_out.charset.len;
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339 }
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340
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341 if (!(ctx->boundary_header.data = ngx_palloc(r->pool, len))) {
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342 return NGX_ERROR;
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343 }
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344
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42
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345 boundary = ngx_next_temp_number(0);
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10
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346
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347 /*
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348 * The boundary header of the range:
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349 * CRLF
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350 * "--0123456789" CRLF
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351 * "Content-Type: image/jpeg" CRLF
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352 * "Content-Range: bytes "
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353 */
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354
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355 if (r->headers_out.charset.len) {
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356 ctx->boundary_header.len = ngx_sprintf(ctx->boundary_header.data,
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42
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357 CRLF "--%0muA" CRLF
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10
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358 "Content-Type: %V; charset=%V" CRLF
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359 "Content-Range: bytes ",
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360 boundary,
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361 &r->headers_out.content_type->value,
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362 &r->headers_out.charset)
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363 - ctx->boundary_header.data;
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364
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365 r->headers_out.charset.len = 0;
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0
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366
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367 } else {
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10
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368 ctx->boundary_header.len = ngx_sprintf(ctx->boundary_header.data,
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42
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369 CRLF "--%0muA" CRLF
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10
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370 "Content-Type: %V" CRLF
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371 "Content-Range: bytes ",
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372 boundary,
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373 &r->headers_out.content_type->value)
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374 - ctx->boundary_header.data;
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375 }
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0
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376
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10
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377 r->headers_out.content_type->value.data =
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42
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378 ngx_palloc(r->pool,
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379 sizeof("Content-Type: multipart/byteranges; boundary=") - 1
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380 + NGX_ATOMIC_T_LEN);
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0
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381
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10
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382 if (r->headers_out.content_type->value.data == NULL) {
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383 return NGX_ERROR;
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384 }
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0
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385
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10
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386 /* "Content-Type: multipart/byteranges; boundary=0123456789" */
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0
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387
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10
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388 r->headers_out.content_type->value.len =
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389 ngx_sprintf(r->headers_out.content_type->value.data,
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42
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390 "multipart/byteranges; boundary=%0muA",
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10
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391 boundary)
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392 - r->headers_out.content_type->value.data;
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0
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393
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42
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394
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10
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395 /* the size of the last boundary CRLF "--0123456789--" CRLF */
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42
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396
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397 len = sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN + sizeof("--" CRLF) - 1;
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0
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398
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10
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399 range = r->headers_out.ranges.elts;
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400 for (i = 0; i < r->headers_out.ranges.nelts; i++) {
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4
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401
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10
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402 /* the size of the range: "SSSS-EEEE/TTTT" CRLF CRLF */
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4
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403
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10
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404 range[i].content_range.data =
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405 ngx_palloc(r->pool, 3 * NGX_OFF_T_LEN + 2 + 4);
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0
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406
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10
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407 if (range[i].content_range.data == NULL) {
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408 return NGX_ERROR;
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409 }
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0
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410
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|
10
|
411 range[i].content_range.len = ngx_sprintf(range[i].content_range.data,
|
|
|
412 "%O-%O/%O" CRLF CRLF,
|
|
|
413 range[i].start, range[i].end - 1,
|
|
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414 r->headers_out.content_length_n)
|
|
|
415 - range[i].content_range.data;
|
|
0
|
416
|
|
10
|
417 len += ctx->boundary_header.len + range[i].content_range.len
|
|
|
418 + (size_t) (range[i].end - range[i].start);
|
|
|
419 }
|
|
0
|
420
|
|
10
|
421 r->headers_out.content_length_n = len;
|
|
|
422 r->headers_out.content_length = NULL;
|
|
0
|
423
|
|
|
424 return ngx_http_next_header_filter(r);
|
|
|
425 }
|
|
|
426
|
|
|
427
|
|
42
|
428 static ngx_int_t
|
|
|
429 ngx_http_range_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
|
|
0
|
430 {
|
|
|
431 ngx_uint_t i;
|
|
|
432 ngx_buf_t *b;
|
|
|
433 ngx_chain_t *out, *hcl, *rcl, *dcl, **ll;
|
|
|
434 ngx_http_range_t *range;
|
|
|
435 ngx_http_range_filter_ctx_t *ctx;
|
|
|
436
|
|
|
437 if (r->headers_out.ranges.nelts == 0) {
|
|
|
438 return ngx_http_next_body_filter(r, in);
|
|
|
439 }
|
|
|
440
|
|
|
441 /*
|
|
|
442 * the optimized version for the static files only
|
|
|
443 * that are passed in the single file buf
|
|
|
444 */
|
|
|
445
|
|
|
446 if (in && in->buf->in_file && in->buf->last_buf) {
|
|
|
447 range = r->headers_out.ranges.elts;
|
|
|
448
|
|
|
449 if (r->headers_out.ranges.nelts == 1) {
|
|
|
450 in->buf->file_pos = range->start;
|
|
|
451 in->buf->file_last = range->end;
|
|
|
452
|
|
|
453 return ngx_http_next_body_filter(r, in);
|
|
|
454 }
|
|
|
455
|
|
|
456 ctx = ngx_http_get_module_ctx(r, ngx_http_range_body_filter_module);
|
|
|
457 ll = &out;
|
|
|
458
|
|
|
459 for (i = 0; i < r->headers_out.ranges.nelts; i++) {
|
|
|
460
|
|
|
461 /*
|
|
|
462 * The boundary header of the range:
|
|
|
463 * CRLF
|
|
|
464 * "--0123456789" CRLF
|
|
|
465 * "Content-Type: image/jpeg" CRLF
|
|
|
466 * "Content-Range: bytes "
|
|
|
467 */
|
|
|
468
|
|
10
|
469 if (!(b = ngx_calloc_buf(r->pool))) {
|
|
|
470 return NGX_ERROR;
|
|
|
471 }
|
|
|
472
|
|
0
|
473 b->memory = 1;
|
|
|
474 b->pos = ctx->boundary_header.data;
|
|
|
475 b->last = ctx->boundary_header.data + ctx->boundary_header.len;
|
|
|
476
|
|
10
|
477 if (!(hcl = ngx_alloc_chain_link(r->pool))) {
|
|
|
478 return NGX_ERROR;
|
|
|
479 }
|
|
|
480
|
|
0
|
481 hcl->buf = b;
|
|
|
482
|
|
10
|
483
|
|
0
|
484 /* "SSSS-EEEE/TTTT" CRLF CRLF */
|
|
|
485
|
|
10
|
486 if (!(b = ngx_calloc_buf(r->pool))) {
|
|
|
487 return NGX_ERROR;
|
|
|
488 }
|
|
|
489
|
|
0
|
490 b->temporary = 1;
|
|
|
491 b->pos = range[i].content_range.data;
|
|
|
492 b->last = range[i].content_range.data + range[i].content_range.len;
|
|
|
493
|
|
10
|
494 if (!(rcl = ngx_alloc_chain_link(r->pool))) {
|
|
|
495 return NGX_ERROR;
|
|
|
496 }
|
|
|
497
|
|
0
|
498 rcl->buf = b;
|
|
|
499
|
|
10
|
500
|
|
0
|
501 /* the range data */
|
|
|
502
|
|
10
|
503 if (!(b = ngx_calloc_buf(r->pool))) {
|
|
|
504 return NGX_ERROR;
|
|
|
505 }
|
|
|
506
|
|
0
|
507 b->in_file = 1;
|
|
|
508 b->file_pos = range[i].start;
|
|
|
509 b->file_last = range[i].end;
|
|
|
510 b->file = in->buf->file;
|
|
|
511
|
|
10
|
512 if (!(dcl = ngx_alloc_chain_link(r->pool))) {
|
|
|
513 return NGX_ERROR;
|
|
|
514 }
|
|
|
515
|
|
|
516 dcl->buf = b;
|
|
0
|
517
|
|
|
518 *ll = hcl;
|
|
|
519 hcl->next = rcl;
|
|
|
520 rcl->next = dcl;
|
|
|
521 ll = &dcl->next;
|
|
|
522 }
|
|
|
523
|
|
|
524 /* the last boundary CRLF "--0123456789--" CRLF */
|
|
|
525
|
|
10
|
526 if (!(b = ngx_calloc_buf(r->pool))) {
|
|
|
527 return NGX_ERROR;
|
|
|
528 }
|
|
|
529
|
|
0
|
530 b->temporary = 1;
|
|
|
531 b->last_buf = 1;
|
|
10
|
532
|
|
42
|
533 b->pos = ngx_palloc(r->pool, sizeof(CRLF "--") - 1 + NGX_ATOMIC_T_LEN
|
|
|
534 + sizeof("--" CRLF) - 1);
|
|
10
|
535 if (b->pos == NULL) {
|
|
|
536 return NGX_ERROR;
|
|
|
537 }
|
|
|
538
|
|
0
|
539 b->last = ngx_cpymem(b->pos, ctx->boundary_header.data, 4 + 10);
|
|
|
540 *b->last++ = '-'; *b->last++ = '-';
|
|
|
541 *b->last++ = CR; *b->last++ = LF;
|
|
|
542
|
|
10
|
543 if (!(hcl = ngx_alloc_chain_link(r->pool))) {
|
|
|
544 return NGX_ERROR;
|
|
|
545 }
|
|
|
546
|
|
|
547 hcl->buf = b;
|
|
|
548 hcl->next = NULL;
|
|
|
549
|
|
0
|
550 *ll = hcl;
|
|
|
551
|
|
|
552 return ngx_http_next_body_filter(r, out);
|
|
|
553 }
|
|
|
554
|
|
|
555 /* TODO: alert */
|
|
|
556
|
|
|
557 return ngx_http_next_body_filter(r, in);
|
|
|
558 }
|
|
|
559
|
|
|
560
|
|
42
|
561 static ngx_int_t
|
|
|
562 ngx_http_range_header_filter_init(ngx_cycle_t *cycle)
|
|
0
|
563 {
|
|
|
564 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
565 ngx_http_top_header_filter = ngx_http_range_header_filter;
|
|
|
566
|
|
|
567 return NGX_OK;
|
|
|
568 }
|
|
|
569
|
|
|
570
|
|
42
|
571 static ngx_int_t
|
|
|
572 ngx_http_range_body_filter_init(ngx_cycle_t *cycle)
|
|
0
|
573 {
|
|
|
574 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
|
575 ngx_http_top_body_filter = ngx_http_range_body_filter;
|
|
|
576
|
|
|
577 return NGX_OK;
|
|
|
578 }
|
