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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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18
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12 #if (NGX_HAVE_OPENSSL_MD5_H)
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0
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13 #include <openssl/md5.h>
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14 #else
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15 #include <md5.h>
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16 #endif
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17
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18
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18 #if (NGX_OPENSSL_MD5)
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0
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19 #define MD5Init MD5_Init
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20 #define MD5Update MD5_Update
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21 #define MD5Final MD5_Final
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22 #endif
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23
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24
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18
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25 #if 0
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0
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26
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27 int ngx_http_cache_get_file(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx)
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28 {
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29 MD5_CTX md5;
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30
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31 /* we use offsetof() because sizeof() pads struct size to int size */
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32 ctx->header_size = offsetof(ngx_http_cache_header_t, key)
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33 + ctx->key.len + 1;
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34
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35 ctx->file.name.len = ctx->path->name.len + 1 + ctx->path->len + 32;
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36 if (!(ctx->file.name.data = ngx_palloc(r->pool, ctx->file.name.len + 1))) {
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37 return NGX_ERROR;
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38 }
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39
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40 ngx_memcpy(ctx->file.name.data, ctx->path->name.data, ctx->path->name.len);
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41
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42 MD5Init(&md5);
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43 MD5Update(&md5, (u_char *) ctx->key.data, ctx->key.len);
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44 MD5Final(ctx->md5, &md5);
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45
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46 ngx_md5_text(ctx->file.name.data + ctx->path->name.len + 1 + ctx->path->len,
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47 ctx->md5);
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48
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49 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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50 "file cache uri: %s, md5: %s", ctx->key.data,
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51 ctx->file.name.data + ctx->path->name.len + 1 + ctx->path->len);
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52
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53 ngx_create_hashed_filename(&ctx->file, ctx->path);
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54
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55 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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56 "file cache name: %s", ctx->file.name.data);
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57
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58 /* TODO: look open files cache */
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59
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60 return ngx_http_cache_open_file(ctx, 0);
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61 }
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62
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63
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64 int ngx_http_cache_open_file(ngx_http_cache_ctx_t *ctx, ngx_file_uniq_t uniq)
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65 {
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66 ssize_t n;
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67 ngx_err_t err;
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68 ngx_http_cache_header_t *h;
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69
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70 ctx->file.fd = ngx_open_file(ctx->file.name.data,
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71 NGX_FILE_RDONLY, NGX_FILE_OPEN);
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72
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73 if (ctx->file.fd == NGX_INVALID_FILE) {
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74 err = ngx_errno;
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75
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76 if (err == NGX_ENOENT || err == NGX_ENOTDIR) {
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77 return NGX_DECLINED;
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78 }
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79
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80 ngx_log_error(NGX_LOG_CRIT, ctx->log, ngx_errno,
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81 ngx_open_file_n " \"%s\" failed", ctx->file.name.data);
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82 return NGX_ERROR;
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83 }
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84
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85 if (uniq) {
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86 if (ngx_fd_info(ctx->file.fd, &ctx->file.info) == NGX_FILE_ERROR) {
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87 ngx_log_error(NGX_LOG_CRIT, ctx->log, ngx_errno,
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88 ngx_fd_info_n " \"%s\" failed", ctx->file.name.data);
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89
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90 return NGX_ERROR;
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91 }
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92
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93 if (ngx_file_uniq(&ctx->file.info) == uniq) {
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94 if (ngx_close_file(ctx->file.fd) == NGX_FILE_ERROR) {
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95 ngx_log_error(NGX_LOG_ALERT, ctx->log, ngx_errno,
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96 ngx_close_file_n " \"%s\" failed",
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97 ctx->file.name.data);
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98 }
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99
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100 return NGX_HTTP_CACHE_THE_SAME;
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101 }
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102 }
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103
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104 n = ngx_read_file(&ctx->file, ctx->buf->pos,
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105 ctx->buf->end - ctx->buf->last, 0);
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106
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107 if (n == NGX_ERROR || n == NGX_AGAIN) {
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108 return n;
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109 }
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110
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111 if (n <= ctx->header_size) {
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112 ngx_log_error(NGX_LOG_CRIT, ctx->log, 0,
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113 "cache file \"%s\" is too small", ctx->file.name.data);
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114 return NGX_ERROR;
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115 }
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116
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117 h = (ngx_http_cache_header_t *) ctx->buf->pos;
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118 ctx->expires = h->expires;
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119 ctx->last_modified= h->last_modified;
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120 ctx->date = h->date;
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121 ctx->length = h->length;
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122
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123 if (h->key_len > (size_t) (ctx->buf->end - ctx->buf->pos)) {
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124 ngx_log_error(NGX_LOG_ALERT, ctx->log, 0,
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125 "cache file \"%s\" is probably invalid",
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126 ctx->file.name.data);
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127 return NGX_DECLINED;
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128 }
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129
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130 if (ctx->key.len
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131 && (h->key_len != ctx->key.len
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132 || ngx_strncmp(h->key, ctx->key.data, h->key_len) != 0))
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133 {
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134 h->key[h->key_len] = '\0';
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135 ngx_log_error(NGX_LOG_ALERT, ctx->log, 0,
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136 "md5 collision: \"%s\" and \"%s\"",
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137 h->key, ctx->key.data);
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138 return NGX_DECLINED;
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139 }
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140
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141 ctx->buf->last += n;
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142
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143 if (ctx->expires < ngx_time()) {
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144
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145 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ctx->log, 0,
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146 "http file cache expired");
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147
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148 return NGX_HTTP_CACHE_STALE;
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149 }
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150
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151 /* TODO: NGX_HTTP_CACHE_AGED */
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152
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153 return NGX_OK;
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154 }
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155
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156
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157 int ngx_http_cache_update_file(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx,
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158 ngx_str_t *temp_file)
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159 {
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160 int retry;
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161 ngx_err_t err;
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162
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163 retry = 0;
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164
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165 for ( ;; ) {
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166 if (ngx_rename_file(temp_file->data, ctx->file.name.data) == NGX_OK) {
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167 return NGX_OK;
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168 }
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169
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170 err = ngx_errno;
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171
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10
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172 #if (NGX_WIN32)
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0
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173 if (err == NGX_EEXIST) {
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174 if (ngx_win32_rename_file(temp_file, &ctx->file.name, r->pool)
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175 == NGX_ERROR)
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176 {
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177 return NGX_ERROR;
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178 }
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179 }
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180 #endif
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181
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182 if (retry || (err != NGX_ENOENT && err != NGX_ENOTDIR)) {
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183 ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
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184 ngx_rename_file_n "(\"%s\", \"%s\") failed",
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185 temp_file->data, ctx->file.name.data);
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186
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187 return NGX_ERROR;
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188 }
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189
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190 if (ngx_create_path(&ctx->file, ctx->path) == NGX_ERROR) {
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191 return NGX_ERROR;
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192 }
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193
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194 retry = 1;
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195 }
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196 }
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197
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198
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199 int ngx_garbage_collector_http_cache_handler(ngx_gc_t *gc, ngx_str_t *name,
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200 ngx_dir_t *dir)
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201 {
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202 int rc;
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203 char data[sizeof(ngx_http_cache_header_t)];
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204 ngx_hunk_t buf;
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205 ngx_http_cache_ctx_t ctx;
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206
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207 ctx.file.fd = NGX_INVALID_FILE;
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208 ctx.file.name = *name;
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209 ctx.file.log = gc->log;
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210
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211 ctx.header_size = sizeof(ngx_http_cache_header_t);
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212 ctx.buf = &buf;
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213 ctx.log = gc->log;
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214 ctx.key.len = 0;
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215
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216 buf.type = NGX_HUNK_IN_MEMORY|NGX_HUNK_TEMP;
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217 buf.pos = data;
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218 buf.last = data;
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219 buf.start = data;
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220 buf.end = data + sizeof(ngx_http_cache_header_t);
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221
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222 rc = ngx_http_cache_open_file(&ctx, 0);
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223
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224 /* TODO: NGX_AGAIN */
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225
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226 if (rc != NGX_ERROR && rc != NGX_DECLINED && rc != NGX_HTTP_CACHE_STALE) {
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227 return NGX_OK;
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228 }
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229
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230 if (ngx_delete_file(name->data) == NGX_FILE_ERROR) {
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231 ngx_log_error(NGX_LOG_CRIT, gc->log, ngx_errno,
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232 ngx_delete_file_n " \"%s\" failed", name->data);
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233 return NGX_ERROR;
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234 }
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235
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236 gc->deleted++;
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237 gc->freed += ngx_de_size(dir);
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238
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239 return NGX_OK;
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240 }
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18
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241
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242 #endif
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