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6317
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1
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2 /*
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3 * Copyright (C) Roman Arutyunyan
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4 * Copyright (C) Nginx, Inc.
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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11
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12
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13 typedef struct {
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14 size_t size;
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15 } ngx_http_slice_loc_conf_t;
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16
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17
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18 typedef struct {
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19 off_t start;
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20 off_t end;
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21 ngx_str_t range;
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22 ngx_str_t etag;
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23 ngx_uint_t last; /* unsigned last:1; */
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24 } ngx_http_slice_ctx_t;
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25
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26
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27 typedef struct {
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28 off_t start;
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29 off_t end;
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30 off_t complete_length;
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31 } ngx_http_slice_content_range_t;
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32
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33
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34 static ngx_int_t ngx_http_slice_header_filter(ngx_http_request_t *r);
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35 static ngx_int_t ngx_http_slice_body_filter(ngx_http_request_t *r,
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36 ngx_chain_t *in);
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37 static ngx_int_t ngx_http_slice_parse_content_range(ngx_http_request_t *r,
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38 ngx_http_slice_content_range_t *cr);
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39 static ngx_int_t ngx_http_slice_range_variable(ngx_http_request_t *r,
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40 ngx_http_variable_value_t *v, uintptr_t data);
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41 static off_t ngx_http_slice_get_start(ngx_http_request_t *r);
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42 static void *ngx_http_slice_create_loc_conf(ngx_conf_t *cf);
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43 static char *ngx_http_slice_merge_loc_conf(ngx_conf_t *cf, void *parent,
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44 void *child);
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45 static ngx_int_t ngx_http_slice_add_variables(ngx_conf_t *cf);
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46 static ngx_int_t ngx_http_slice_init(ngx_conf_t *cf);
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47
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48
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49 static ngx_command_t ngx_http_slice_filter_commands[] = {
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50
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51 { ngx_string("slice"),
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52 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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53 ngx_conf_set_size_slot,
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54 NGX_HTTP_LOC_CONF_OFFSET,
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55 offsetof(ngx_http_slice_loc_conf_t, size),
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56 NULL },
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57
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58 ngx_null_command
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59 };
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60
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61
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62 static ngx_http_module_t ngx_http_slice_filter_module_ctx = {
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63 ngx_http_slice_add_variables, /* preconfiguration */
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64 ngx_http_slice_init, /* postconfiguration */
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65
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66 NULL, /* create main configuration */
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67 NULL, /* init main configuration */
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68
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69 NULL, /* create server configuration */
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70 NULL, /* merge server configuration */
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71
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72 ngx_http_slice_create_loc_conf, /* create location configuration */
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73 ngx_http_slice_merge_loc_conf /* merge location configuration */
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74 };
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75
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76
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77 ngx_module_t ngx_http_slice_filter_module = {
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78 NGX_MODULE_V1,
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79 &ngx_http_slice_filter_module_ctx, /* module context */
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80 ngx_http_slice_filter_commands, /* module directives */
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81 NGX_HTTP_MODULE, /* module type */
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82 NULL, /* init master */
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83 NULL, /* init module */
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84 NULL, /* init process */
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85 NULL, /* init thread */
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86 NULL, /* exit thread */
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87 NULL, /* exit process */
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88 NULL, /* exit master */
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89 NGX_MODULE_V1_PADDING
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90 };
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91
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92
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93 static ngx_str_t ngx_http_slice_range_name = ngx_string("slice_range");
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94
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95 static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
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96 static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
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97
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98
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99 static ngx_int_t
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100 ngx_http_slice_header_filter(ngx_http_request_t *r)
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101 {
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102 off_t end;
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103 ngx_int_t rc;
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104 ngx_table_elt_t *h;
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105 ngx_http_slice_ctx_t *ctx;
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106 ngx_http_slice_loc_conf_t *slcf;
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107 ngx_http_slice_content_range_t cr;
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108
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109 ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module);
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110 if (ctx == NULL) {
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111 return ngx_http_next_header_filter(r);
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112 }
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113
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114 if (r->headers_out.status != NGX_HTTP_PARTIAL_CONTENT) {
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115 if (r == r->main) {
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116 ngx_http_set_ctx(r, NULL, ngx_http_slice_filter_module);
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117 return ngx_http_next_header_filter(r);
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118 }
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119
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120 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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121 "unexpected status code %ui in slice response",
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122 r->headers_out.status);
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123 return NGX_ERROR;
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124 }
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125
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126 h = r->headers_out.etag;
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127
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128 if (ctx->etag.len) {
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129 if (h == NULL
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130 || h->value.len != ctx->etag.len
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131 || ngx_strncmp(h->value.data, ctx->etag.data, ctx->etag.len)
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132 != 0)
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133 {
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134 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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135 "etag mismatch in slice response");
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136 return NGX_ERROR;
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137 }
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138 }
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139
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140 if (h) {
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141 ctx->etag = h->value;
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142 }
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143
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144 if (ngx_http_slice_parse_content_range(r, &cr) != NGX_OK) {
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145 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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146 "invalid range in slice response");
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147 return NGX_ERROR;
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148 }
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149
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150 if (cr.complete_length == -1) {
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151 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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152 "no complete length in slice response");
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153 return NGX_ERROR;
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154 }
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155
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156 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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157 "http slice response range: %O-%O/%O",
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158 cr.start, cr.end, cr.complete_length);
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159
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160 slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module);
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161
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162 end = ngx_min(cr.start + (off_t) slcf->size, cr.complete_length);
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163
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164 if (cr.start != ctx->start || cr.end != end) {
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165 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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166 "unexpected range in slice response: %O-%O",
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167 cr.start, cr.end);
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168 return NGX_ERROR;
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169 }
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170
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171 ctx->start = end;
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172
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173 r->headers_out.status = NGX_HTTP_OK;
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174 r->headers_out.status_line.len = 0;
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175 r->headers_out.content_length_n = cr.complete_length;
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176 r->headers_out.content_offset = cr.start;
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177 r->headers_out.content_range->hash = 0;
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178 r->headers_out.content_range = NULL;
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179
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180 r->allow_ranges = 1;
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181 r->subrequest_ranges = 1;
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182 r->single_range = 1;
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183
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184 rc = ngx_http_next_header_filter(r);
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185
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186 if (r != r->main) {
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187 return rc;
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188 }
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189
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190 if (r->headers_out.status == NGX_HTTP_PARTIAL_CONTENT) {
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191 if (ctx->start + (off_t) slcf->size <= r->headers_out.content_offset) {
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192 ctx->start = slcf->size
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193 * (r->headers_out.content_offset / slcf->size);
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194 }
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195
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196 ctx->end = r->headers_out.content_offset
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197 + r->headers_out.content_length_n;
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198
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199 } else {
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200 ctx->end = cr.complete_length;
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201 }
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202
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203 return rc;
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204 }
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205
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206
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207 static ngx_int_t
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208 ngx_http_slice_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
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209 {
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210 ngx_int_t rc;
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211 ngx_chain_t *cl;
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212 ngx_http_request_t *sr;
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213 ngx_http_slice_ctx_t *ctx;
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214 ngx_http_slice_loc_conf_t *slcf;
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215
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216 ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module);
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217
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218 if (ctx == NULL || r != r->main) {
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219 return ngx_http_next_body_filter(r, in);
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220 }
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221
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222 for (cl = in; cl; cl = cl->next) {
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223 if (cl->buf->last_buf) {
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224 cl->buf->last_buf = 0;
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225 cl->buf->sync = 1;
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226 ctx->last = 1;
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227 }
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228 }
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229
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230 rc = ngx_http_next_body_filter(r, in);
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231
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232 if (rc == NGX_ERROR || !ctx->last) {
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233 return rc;
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234 }
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235
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236 if (ctx->start >= ctx->end) {
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237 ngx_http_set_ctx(r, NULL, ngx_http_slice_filter_module);
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238 ngx_http_send_special(r, NGX_HTTP_LAST);
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239 return rc;
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240 }
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241
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242 if (ngx_http_subrequest(r, &r->uri, &r->args, &sr, NULL, 0) != NGX_OK) {
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243 return NGX_ERROR;
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244 }
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245
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246 ngx_http_set_ctx(sr, ctx, ngx_http_slice_filter_module);
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247
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248 slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module);
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249
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250 ctx->range.len = ngx_sprintf(ctx->range.data, "bytes=%O-%O", ctx->start,
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251 ctx->start + (off_t) slcf->size - 1)
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252 - ctx->range.data;
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253
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254 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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255 "http slice subrequest: \"%V\"", &ctx->range);
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256
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257 return rc;
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258 }
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259
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260
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261 static ngx_int_t
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262 ngx_http_slice_parse_content_range(ngx_http_request_t *r,
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263 ngx_http_slice_content_range_t *cr)
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264 {
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265 off_t start, end, complete_length, cutoff, cutlim;
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266 u_char *p;
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267 ngx_table_elt_t *h;
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268
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269 h = r->headers_out.content_range;
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270
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271 if (h == NULL
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272 || h->value.len < 7
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273 || ngx_strncmp(h->value.data, "bytes ", 6) != 0)
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274 {
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275 return NGX_ERROR;
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276 }
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277
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278 p = h->value.data + 6;
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279
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280 cutoff = NGX_MAX_OFF_T_VALUE / 10;
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281 cutlim = NGX_MAX_OFF_T_VALUE % 10;
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282
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283 start = 0;
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284 end = 0;
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285 complete_length = 0;
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286
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287 while (*p == ' ') { p++; }
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288
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289 if (*p < '0' || *p > '9') {
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290 return NGX_ERROR;
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291 }
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292
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293 while (*p >= '0' && *p <= '9') {
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294 if (start >= cutoff && (start > cutoff || *p - '0' > cutlim)) {
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295 return NGX_ERROR;
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296 }
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297
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298 start = start * 10 + *p++ - '0';
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299 }
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300
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301 while (*p == ' ') { p++; }
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302
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303 if (*p++ != '-') {
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304 return NGX_ERROR;
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305 }
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306
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307 while (*p == ' ') { p++; }
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308
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309 if (*p < '0' || *p > '9') {
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310 return NGX_ERROR;
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311 }
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312
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313 while (*p >= '0' && *p <= '9') {
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314 if (end >= cutoff && (end > cutoff || *p - '0' > cutlim)) {
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315 return NGX_ERROR;
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316 }
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317
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318 end = end * 10 + *p++ - '0';
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319 }
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320
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321 end++;
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322
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323 while (*p == ' ') { p++; }
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324
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325 if (*p++ != '/') {
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326 return NGX_ERROR;
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327 }
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328
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329 while (*p == ' ') { p++; }
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330
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331 if (*p != '*') {
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332 if (*p < '0' || *p > '9') {
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333 return NGX_ERROR;
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334 }
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335
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336 while (*p >= '0' && *p <= '9') {
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337 if (complete_length >= cutoff
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338 && (complete_length > cutoff || *p - '0' > cutlim))
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339 {
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340 return NGX_ERROR;
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341 }
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342
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343 complete_length = complete_length * 10 + *p++ - '0';
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344 }
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345
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346 } else {
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347 complete_length = -1;
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348 p++;
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349 }
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350
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351 while (*p == ' ') { p++; }
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352
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353 if (*p != '\0') {
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354 return NGX_ERROR;
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355 }
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356
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357 cr->start = start;
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358 cr->end = end;
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359 cr->complete_length = complete_length;
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360
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361 return NGX_OK;
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362 }
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363
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364
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365 static ngx_int_t
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366 ngx_http_slice_range_variable(ngx_http_request_t *r,
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367 ngx_http_variable_value_t *v, uintptr_t data)
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368 {
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369 u_char *p;
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370 ngx_http_slice_ctx_t *ctx;
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371 ngx_http_slice_loc_conf_t *slcf;
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372
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373 ctx = ngx_http_get_module_ctx(r, ngx_http_slice_filter_module);
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374
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375 if (ctx == NULL) {
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376 if (r != r->main || r->headers_out.status) {
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377 v->not_found = 1;
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378 return NGX_OK;
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379 }
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380
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381 slcf = ngx_http_get_module_loc_conf(r, ngx_http_slice_filter_module);
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382
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383 if (slcf->size == 0) {
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384 v->not_found = 1;
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385 return NGX_OK;
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386 }
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387
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388 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_slice_ctx_t));
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389 if (ctx == NULL) {
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390 return NGX_ERROR;
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391 }
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392
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393 ngx_http_set_ctx(r, ctx, ngx_http_slice_filter_module);
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394
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395 p = ngx_pnalloc(r->pool, sizeof("bytes=-") - 1 + 2 * NGX_OFF_T_LEN);
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396 if (p == NULL) {
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397 return NGX_ERROR;
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398 }
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399
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400 ctx->start = slcf->size * (ngx_http_slice_get_start(r) / slcf->size);
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401
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402 ctx->range.data = p;
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403 ctx->range.len = ngx_sprintf(p, "bytes=%O-%O", ctx->start,
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404 ctx->start + (off_t) slcf->size - 1)
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405 - p;
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406 }
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407
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408 v->data = ctx->range.data;
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409 v->valid = 1;
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410 v->not_found = 0;
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411 v->no_cacheable = 1;
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412 v->len = ctx->range.len;
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413
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414 return NGX_OK;
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|
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415 }
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416
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417
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418 static off_t
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419 ngx_http_slice_get_start(ngx_http_request_t *r)
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420 {
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421 off_t start, cutoff, cutlim;
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422 u_char *p;
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423 ngx_table_elt_t *h;
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424
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425 if (r->headers_in.if_range) {
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426 return 0;
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|
|
427 }
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|
|
428
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|
|
429 h = r->headers_in.range;
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430
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|
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431 if (h == NULL
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432 || h->value.len < 7
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433 || ngx_strncasecmp(h->value.data, (u_char *) "bytes=", 6) != 0)
|
|
|
434 {
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|
|
435 return 0;
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|
|
436 }
|
|
|
437
|
|
|
438 p = h->value.data + 6;
|
|
|
439
|
|
|
440 if (ngx_strchr(p, ',')) {
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|
|
441 return 0;
|
|
|
442 }
|
|
|
443
|
|
|
444 while (*p == ' ') { p++; }
|
|
|
445
|
|
|
446 if (*p == '-') {
|
|
|
447 return 0;
|
|
|
448 }
|
|
|
449
|
|
|
450 cutoff = NGX_MAX_OFF_T_VALUE / 10;
|
|
|
451 cutlim = NGX_MAX_OFF_T_VALUE % 10;
|
|
|
452
|
|
|
453 start = 0;
|
|
|
454
|
|
|
455 while (*p >= '0' && *p <= '9') {
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|
|
456 if (start >= cutoff && (start > cutoff || *p - '0' > cutlim)) {
|
|
|
457 return 0;
|
|
|
458 }
|
|
|
459
|
|
|
460 start = start * 10 + *p++ - '0';
|
|
|
461 }
|
|
|
462
|
|
|
463 return start;
|
|
|
464 }
|
|
|
465
|
|
|
466
|
|
|
467 static void *
|
|
|
468 ngx_http_slice_create_loc_conf(ngx_conf_t *cf)
|
|
|
469 {
|
|
|
470 ngx_http_slice_loc_conf_t *slcf;
|
|
|
471
|
|
|
472 slcf = ngx_palloc(cf->pool, sizeof(ngx_http_slice_loc_conf_t));
|
|
|
473 if (slcf == NULL) {
|
|
|
474 return NULL;
|
|
|
475 }
|
|
|
476
|
|
|
477 slcf->size = NGX_CONF_UNSET_SIZE;
|
|
|
478
|
|
|
479 return slcf;
|
|
|
480 }
|
|
|
481
|
|
|
482
|
|
|
483 static char *
|
|
|
484 ngx_http_slice_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
485 {
|
|
|
486 ngx_http_slice_loc_conf_t *prev = parent;
|
|
|
487 ngx_http_slice_loc_conf_t *conf = child;
|
|
|
488
|
|
|
489 ngx_conf_merge_size_value(conf->size, prev->size, 0);
|
|
|
490
|
|
|
491 return NGX_CONF_OK;
|
|
|
492 }
|
|
|
493
|
|
|
494
|
|
|
495 static ngx_int_t
|
|
|
496 ngx_http_slice_add_variables(ngx_conf_t *cf)
|
|
|
497 {
|
|
|
498 ngx_http_variable_t *var;
|
|
|
499
|
|
|
500 var = ngx_http_add_variable(cf, &ngx_http_slice_range_name, 0);
|
|
|
501 if (var == NULL) {
|
|
|
502 return NGX_ERROR;
|
|
|
503 }
|
|
|
504
|
|
|
505 var->get_handler = ngx_http_slice_range_variable;
|
|
|
506
|
|
|
507 return NGX_OK;
|
|
|
508 }
|
|
|
509
|
|
|
510
|
|
|
511 static ngx_int_t
|
|
|
512 ngx_http_slice_init(ngx_conf_t *cf)
|
|
|
513 {
|
|
|
514 ngx_http_next_header_filter = ngx_http_top_header_filter;
|
|
|
515 ngx_http_top_header_filter = ngx_http_slice_header_filter;
|
|
|
516
|
|
|
517 ngx_http_next_body_filter = ngx_http_top_body_filter;
|
|
|
518 ngx_http_top_body_filter = ngx_http_slice_body_filter;
|
|
|
519
|
|
|
520 return NGX_OK;
|
|
|
521 }
|
