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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 ngx_int_t rc;
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111 ngx_uint_t boundary, suffix, i;
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112 u_char *p;
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113 size_t len;
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114 off_t start, end;
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115 ngx_http_range_t *range;
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116 ngx_http_range_filter_ctx_t *ctx;
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117
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118 if (r->http_version < NGX_HTTP_VERSION_10
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119 || r->headers_out.status != NGX_HTTP_OK
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120 || r->headers_out.content_length_n == -1
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121 || !r->filter_allow_ranges)
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122 {
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123 return ngx_http_next_header_filter(r);
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124 }
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125
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126 if (r->headers_in.range == NULL
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127 || r->headers_in.range->value.len < 7
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128 || ngx_strncasecmp(r->headers_in.range->value.data, "bytes=", 6) != 0)
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129 {
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130
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131 r->headers_out.accept_ranges = ngx_list_push(&r->headers_out.headers);
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132 if (r->headers_out.accept_ranges == NULL) {
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133 return NGX_ERROR;
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134 }
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135
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136 r->headers_out.accept_ranges->key.len = sizeof("Accept-Ranges") - 1;
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137 r->headers_out.accept_ranges->key.data = (u_char *) "Accept-Ranges";
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138 r->headers_out.accept_ranges->value.len = sizeof("bytes") - 1;
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139 r->headers_out.accept_ranges->value.data = (u_char *) "bytes";
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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 ngx_init_array(r->headers_out.ranges, r->pool, 5, sizeof(ngx_http_range_t),
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145 NGX_ERROR);
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146
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147 rc = 0;
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148 range = NULL;
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149 p = r->headers_in.range->value.data + 6;
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150
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151 for ( ;; ) {
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152 start = 0;
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153 end = 0;
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154 suffix = 0;
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155
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156 while (*p == ' ') { p++; }
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157
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158 if (*p != '-') {
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159 if (*p < '0' || *p > '9') {
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160 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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161 break;
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162 }
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163
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164 while (*p >= '0' && *p <= '9') {
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165 start = start * 10 + *p++ - '0';
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166 }
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167
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168 while (*p == ' ') { p++; }
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169
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170 if (*p++ != '-') {
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171 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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172 break;
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173 }
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174
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175 if (start >= r->headers_out.content_length_n) {
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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 while (*p == ' ') { p++; }
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181
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182 if (*p == ',' || *p == '\0') {
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183 ngx_test_null(range, ngx_push_array(&r->headers_out.ranges),
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184 NGX_ERROR);
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185 range->start = start;
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186 range->end = r->headers_out.content_length_n;
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187
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188 if (*p++ != ',') {
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189 break;
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190 }
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191
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192 continue;
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193 }
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194
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195 } else {
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196 suffix = 1;
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197 p++;
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198 }
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199
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200 if (*p < '0' || *p > '9') {
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201 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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202 break;
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203 }
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204
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205 while (*p >= '0' && *p <= '9') {
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206 end = end * 10 + *p++ - '0';
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207 }
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208
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209 while (*p == ' ') { p++; }
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210
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211 if (*p != ',' && *p != '\0') {
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212 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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213 break;
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214 }
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215
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216 if (suffix) {
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217 start = r->headers_out.content_length_n - end;
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218 end = r->headers_out.content_length_n - 1;
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219 }
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220
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221 if (start > end) {
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222 rc = NGX_HTTP_RANGE_NOT_SATISFIABLE;
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223 break;
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224 }
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225
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226 ngx_test_null(range, ngx_push_array(&r->headers_out.ranges), NGX_ERROR);
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227 range->start = start;
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228
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229 if (end >= r->headers_out.content_length_n) {
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230 /*
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231 * Download Accelerator sends the last byte position
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232 * that equals to the file length
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233 */
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234 range->end = r->headers_out.content_length_n;
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235
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236 } else {
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237 range->end = end + 1;
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238 }
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239
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240 if (*p++ != ',') {
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241 break;
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242 }
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243 }
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244
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245 if (rc) {
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246
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247 /* rc == NGX_HTTP_RANGE_NOT_SATISFIABLE */
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248
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249 r->headers_out.status = rc;
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250 r->headers_out.ranges.nelts = 0;
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251
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252 r->headers_out.content_range = ngx_list_push(&r->headers_out.headers);
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253 if (r->headers_out.content_range == NULL) {
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254 return NGX_ERROR;
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255 }
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256
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257 r->headers_out.content_range->key.len = sizeof("Content-Range") - 1;
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258 r->headers_out.content_range->key.data = (u_char *) "Content-Range";
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259
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260 r->headers_out.content_range->value.data =
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261 ngx_palloc(r->pool, 8 + 20 + 1);
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262 if (r->headers_out.content_range->value.data == NULL) {
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263 return NGX_ERROR;
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264 }
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265
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266 r->headers_out.content_range->value.len =
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267 ngx_snprintf((char *) r->headers_out.content_range->value.data,
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268 8 + 20 + 1, "bytes */" OFF_T_FMT,
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269 r->headers_out.content_length_n);
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270
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271 r->headers_out.content_length_n = -1;
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272 if (r->headers_out.content_length) {
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273 r->headers_out.content_length->key.len = 0;
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274 r->headers_out.content_length = NULL;
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275 }
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276
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277 return rc;
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278
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279 } else {
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280 r->headers_out.status = NGX_HTTP_PARTIAL_CONTENT;
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281
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282 if (r->headers_out.ranges.nelts == 1) {
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283
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284 r->headers_out.content_range =
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285 ngx_list_push(&r->headers_out.headers);
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286 if (r->headers_out.content_range == NULL) {
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287 return NGX_ERROR;
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288 }
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289
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290 r->headers_out.content_range->key.len = sizeof("Content-Range") - 1;
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291 r->headers_out.content_range->key.data = (u_char *) "Content-Range";
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292
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293 ngx_test_null(r->headers_out.content_range->value.data,
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294 ngx_palloc(r->pool, 6 + 20 + 1 + 20 + 1 + 20 + 1),
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295 NGX_ERROR);
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296
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297 /* "Content-Range: bytes SSSS-EEEE/TTTT" header */
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298
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299 r->headers_out.content_range->value.len =
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300 ngx_snprintf((char *)
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301 r->headers_out.content_range->value.data,
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302 6 + 20 + 1 + 20 + 1 + 20 + 1,
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303 "bytes " OFF_T_FMT "-" OFF_T_FMT "/" OFF_T_FMT,
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304 range->start, range->end - 1,
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305 r->headers_out.content_length_n);
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306
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307 r->headers_out.content_length_n = range->end - range->start;
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308
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309 } else {
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310
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311 #if 0
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312 /* TODO: what if no content_type ?? */
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313
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314 if (!(r->headers_out.content_type =
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315 ngx_http_add_header(&r->headers_out, ngx_http_headers_out)))
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316 {
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317 return NGX_ERROR;
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318 }
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319 #endif
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320
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321 ngx_http_create_ctx(r, ctx, ngx_http_range_body_filter_module,
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322 sizeof(ngx_http_range_filter_ctx_t), NGX_ERROR);
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323
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324 len = 4 + 10 + 2 + 14 + r->headers_out.content_type->value.len
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325 + 2 + 21 + 1;
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326
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327 if (r->headers_out.charset.len) {
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328 len += 10 + r->headers_out.charset.len;
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329 }
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330
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331 ngx_test_null(ctx->boundary_header.data, ngx_palloc(r->pool, len),
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332 NGX_ERROR);
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333
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334 boundary = ngx_next_temp_number(0);
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335
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336 /*
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337 * The boundary header of the range:
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338 * CRLF
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339 * "--0123456789" CRLF
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340 * "Content-Type: image/jpeg" CRLF
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341 * "Content-Range: bytes "
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342 */
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343
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344 if (r->headers_out.charset.len) {
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345 ctx->boundary_header.len =
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346 ngx_snprintf((char *) ctx->boundary_header.data, len,
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347 CRLF "--%010" NGX_UINT_T_FMT CRLF
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348 "Content-Type: %s; charset=%s" CRLF
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349 "Content-Range: bytes ",
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350 boundary,
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351 r->headers_out.content_type->value.data,
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352 r->headers_out.charset.data);
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353
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354 r->headers_out.charset.len = 0;
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355
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356 } else {
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357 ctx->boundary_header.len =
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358 ngx_snprintf((char *) ctx->boundary_header.data, len,
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359 CRLF "--%010" NGX_UINT_T_FMT CRLF
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360 "Content-Type: %s" CRLF
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361 "Content-Range: bytes ",
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362 boundary,
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363 r->headers_out.content_type->value.data);
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364 }
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365
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366 ngx_test_null(r->headers_out.content_type->value.data,
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367 ngx_palloc(r->pool, 31 + 10 + 1),
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368 NGX_ERROR);
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369
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370 /* "Content-Type: multipart/byteranges; boundary=0123456789" */
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371
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372 r->headers_out.content_type->value.len =
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373 ngx_snprintf((char *)
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374 r->headers_out.content_type->value.data,
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375 31 + 10 + 1,
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376 "multipart/byteranges; boundary=%010"
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377 NGX_UINT_T_FMT,
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378 boundary);
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379
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380 /* the size of the last boundary CRLF "--0123456789--" CRLF */
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381 len = 4 + 10 + 4;
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382
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383 range = r->headers_out.ranges.elts;
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384 for (i = 0; i < r->headers_out.ranges.nelts; i++) {
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385 ngx_test_null(range[i].content_range.data,
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386 ngx_palloc(r->pool, 20 + 1 + 20 + 1 + 20 + 5),
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387 NGX_ERROR);
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388
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389 /* the size of the range: "SSSS-EEEE/TTTT" CRLF CRLF */
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390
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391 range[i].content_range.len =
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392 ngx_snprintf((char *) range[i].content_range.data,
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393 20 + 1 + 20 + 1 + 20 + 5,
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394 OFF_T_FMT "-" OFF_T_FMT "/" OFF_T_FMT CRLF CRLF,
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395 range[i].start, range[i].end - 1,
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396 r->headers_out.content_length_n);
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397
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398 len += ctx->boundary_header.len + range[i].content_range.len
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399 + (size_t) (range[i].end - range[i].start);
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400 }
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401
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402 r->headers_out.content_length_n = len;
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403 r->headers_out.content_length = NULL;
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404 }
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405 }
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406
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407 return ngx_http_next_header_filter(r);
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408 }
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409
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410
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411 static ngx_int_t ngx_http_range_body_filter(ngx_http_request_t *r,
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412 ngx_chain_t *in)
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413 {
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414 ngx_uint_t i;
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415 ngx_buf_t *b;
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416 ngx_chain_t *out, *hcl, *rcl, *dcl, **ll;
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417 ngx_http_range_t *range;
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418 ngx_http_range_filter_ctx_t *ctx;
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419
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420 if (r->headers_out.ranges.nelts == 0) {
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421 return ngx_http_next_body_filter(r, in);
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422 }
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423
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424 /*
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425 * the optimized version for the static files only
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426 * that are passed in the single file buf
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427 */
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428
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429 if (in && in->buf->in_file && in->buf->last_buf) {
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430 range = r->headers_out.ranges.elts;
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431
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432 if (r->headers_out.ranges.nelts == 1) {
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433 in->buf->file_pos = range->start;
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434 in->buf->file_last = range->end;
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435
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436 return ngx_http_next_body_filter(r, in);
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437 }
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438
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439 ctx = ngx_http_get_module_ctx(r, ngx_http_range_body_filter_module);
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440 ll = &out;
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441
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442 for (i = 0; i < r->headers_out.ranges.nelts; i++) {
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443
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444 /*
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445 * The boundary header of the range:
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446 * CRLF
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447 * "--0123456789" CRLF
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448 * "Content-Type: image/jpeg" CRLF
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449 * "Content-Range: bytes "
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450 */
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451
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452 ngx_test_null(b, ngx_calloc_buf(r->pool), NGX_ERROR);
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453 b->memory = 1;
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454 b->pos = ctx->boundary_header.data;
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455 b->last = ctx->boundary_header.data + ctx->boundary_header.len;
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456
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457 ngx_test_null(hcl, ngx_alloc_chain_link(r->pool), NGX_ERROR);
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458 hcl->buf = b;
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459
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460 /* "SSSS-EEEE/TTTT" CRLF CRLF */
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461
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462 ngx_test_null(b, ngx_calloc_buf(r->pool), NGX_ERROR);
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463 b->temporary = 1;
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464 b->pos = range[i].content_range.data;
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465 b->last = range[i].content_range.data + range[i].content_range.len;
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466
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467 ngx_test_null(rcl, ngx_alloc_chain_link(r->pool), NGX_ERROR);
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468 rcl->buf = b;
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469
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470 /* the range data */
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471
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472 ngx_test_null(b, ngx_calloc_buf(r->pool), NGX_ERROR);
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473 b->in_file = 1;
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474 b->file_pos = range[i].start;
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475 b->file_last = range[i].end;
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476 b->file = in->buf->file;
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477
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478 ngx_alloc_link_and_set_buf(dcl, b, r->pool, NGX_ERROR);
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479
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480 *ll = hcl;
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481 hcl->next = rcl;
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482 rcl->next = dcl;
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483 ll = &dcl->next;
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484 }
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485
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486 /* the last boundary CRLF "--0123456789--" CRLF */
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487
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488 ngx_test_null(b, ngx_calloc_buf(r->pool), NGX_ERROR);
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489 b->temporary = 1;
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490 b->last_buf = 1;
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491 ngx_test_null(b->pos, ngx_palloc(r->pool, 4 + 10 + 4), NGX_ERROR);
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492 b->last = ngx_cpymem(b->pos, ctx->boundary_header.data, 4 + 10);
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493 *b->last++ = '-'; *b->last++ = '-';
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494 *b->last++ = CR; *b->last++ = LF;
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495
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496 ngx_alloc_link_and_set_buf(hcl, b, r->pool, NGX_ERROR);
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497 *ll = hcl;
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498
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499 return ngx_http_next_body_filter(r, out);
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500 }
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501
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502 /* TODO: alert */
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503
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504 return ngx_http_next_body_filter(r, in);
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505 }
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506
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507
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508 static ngx_int_t ngx_http_range_header_filter_init(ngx_cycle_t *cycle)
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509 {
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510 ngx_http_next_header_filter = ngx_http_top_header_filter;
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511 ngx_http_top_header_filter = ngx_http_range_header_filter;
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512
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513 return NGX_OK;
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514 }
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515
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516
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517 static ngx_int_t ngx_http_range_body_filter_init(ngx_cycle_t *cycle)
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518 {
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519 ngx_http_next_body_filter = ngx_http_top_body_filter;
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520 ngx_http_top_body_filter = ngx_http_range_body_filter;
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521
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522 return NGX_OK;
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523 }
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