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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 #if (HAVE_OPENSSL_MD5_H)
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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 #if (HAVE_OPENSSL_MD5)
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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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25
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26 int ngx_http_cache_get_file(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx)
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27 {
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28 MD5_CTX md5;
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29
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30 /* we use offsetof() because sizeof() pads struct size to int size */
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31 ctx->header_size = offsetof(ngx_http_cache_header_t, key)
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32 + ctx->key.len + 1;
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33
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34 ctx->file.name.len = ctx->path->name.len + 1 + ctx->path->len + 32;
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35 if (!(ctx->file.name.data = ngx_palloc(r->pool, ctx->file.name.len + 1))) {
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36 return NGX_ERROR;
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37 }
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38
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39 ngx_memcpy(ctx->file.name.data, ctx->path->name.data, ctx->path->name.len);
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40
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41 MD5Init(&md5);
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42 MD5Update(&md5, (u_char *) ctx->key.data, ctx->key.len);
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43 MD5Final(ctx->md5, &md5);
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44
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45 ngx_md5_text(ctx->file.name.data + ctx->path->name.len + 1 + ctx->path->len,
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46 ctx->md5);
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47
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48 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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49 "file cache uri: %s, md5: %s", ctx->key.data,
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50 ctx->file.name.data + ctx->path->name.len + 1 + ctx->path->len);
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51
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52 ngx_create_hashed_filename(&ctx->file, ctx->path);
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53
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54 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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55 "file cache name: %s", ctx->file.name.data);
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56
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57 /* TODO: look open files cache */
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58
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59 return ngx_http_cache_open_file(ctx, 0);
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60 }
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61
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62
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63 int ngx_http_cache_open_file(ngx_http_cache_ctx_t *ctx, ngx_file_uniq_t uniq)
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64 {
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65 ssize_t n;
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66 ngx_err_t err;
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67 ngx_http_cache_header_t *h;
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68
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69 ctx->file.fd = ngx_open_file(ctx->file.name.data,
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70 NGX_FILE_RDONLY, NGX_FILE_OPEN);
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71
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72 if (ctx->file.fd == NGX_INVALID_FILE) {
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73 err = ngx_errno;
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74
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75 if (err == NGX_ENOENT || err == NGX_ENOTDIR) {
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76 return NGX_DECLINED;
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77 }
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78
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79 ngx_log_error(NGX_LOG_CRIT, ctx->log, ngx_errno,
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80 ngx_open_file_n " \"%s\" failed", ctx->file.name.data);
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81 return NGX_ERROR;
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82 }
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83
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84 if (uniq) {
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85 if (ngx_fd_info(ctx->file.fd, &ctx->file.info) == NGX_FILE_ERROR) {
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86 ngx_log_error(NGX_LOG_CRIT, ctx->log, ngx_errno,
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87 ngx_fd_info_n " \"%s\" failed", ctx->file.name.data);
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88
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89 return NGX_ERROR;
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90 }
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91
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92 if (ngx_file_uniq(&ctx->file.info) == uniq) {
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93 if (ngx_close_file(ctx->file.fd) == NGX_FILE_ERROR) {
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94 ngx_log_error(NGX_LOG_ALERT, ctx->log, ngx_errno,
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95 ngx_close_file_n " \"%s\" failed",
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96 ctx->file.name.data);
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97 }
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98
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99 return NGX_HTTP_CACHE_THE_SAME;
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100 }
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101 }
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102
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103 n = ngx_read_file(&ctx->file, ctx->buf->pos,
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104 ctx->buf->end - ctx->buf->last, 0);
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105
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106 if (n == NGX_ERROR || n == NGX_AGAIN) {
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107 return n;
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108 }
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109
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110 if (n <= ctx->header_size) {
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111 ngx_log_error(NGX_LOG_CRIT, ctx->log, 0,
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112 "cache file \"%s\" is too small", ctx->file.name.data);
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113 return NGX_ERROR;
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114 }
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115
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116 h = (ngx_http_cache_header_t *) ctx->buf->pos;
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117 ctx->expires = h->expires;
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118 ctx->last_modified= h->last_modified;
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119 ctx->date = h->date;
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120 ctx->length = h->length;
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121
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122 if (h->key_len > (size_t) (ctx->buf->end - ctx->buf->pos)) {
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123 ngx_log_error(NGX_LOG_ALERT, ctx->log, 0,
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124 "cache file \"%s\" is probably invalid",
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125 ctx->file.name.data);
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126 return NGX_DECLINED;
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127 }
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128
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129 if (ctx->key.len
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130 && (h->key_len != ctx->key.len
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131 || ngx_strncmp(h->key, ctx->key.data, h->key_len) != 0))
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132 {
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133 h->key[h->key_len] = '\0';
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134 ngx_log_error(NGX_LOG_ALERT, ctx->log, 0,
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135 "md5 collision: \"%s\" and \"%s\"",
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136 h->key, ctx->key.data);
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137 return NGX_DECLINED;
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138 }
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139
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140 ctx->buf->last += n;
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141
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142 if (ctx->expires < ngx_time()) {
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143
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144 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ctx->log, 0,
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145 "http file cache expired");
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146
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147 return NGX_HTTP_CACHE_STALE;
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148 }
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149
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150 /* TODO: NGX_HTTP_CACHE_AGED */
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151
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152 return NGX_OK;
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153 }
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154
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155
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156 int ngx_http_cache_update_file(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx,
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157 ngx_str_t *temp_file)
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158 {
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159 int retry;
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160 ngx_err_t err;
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161
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162 retry = 0;
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163
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164 for ( ;; ) {
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165 if (ngx_rename_file(temp_file->data, ctx->file.name.data) == NGX_OK) {
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166 return NGX_OK;
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167 }
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168
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169 err = ngx_errno;
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170
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171 #if (WIN32)
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172 if (err == NGX_EEXIST) {
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173 if (ngx_win32_rename_file(temp_file, &ctx->file.name, r->pool)
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174 == NGX_ERROR)
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175 {
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176 return NGX_ERROR;
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177 }
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178 }
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179 #endif
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180
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181 if (retry || (err != NGX_ENOENT && err != NGX_ENOTDIR)) {
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182 ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
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183 ngx_rename_file_n "(\"%s\", \"%s\") failed",
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184 temp_file->data, ctx->file.name.data);
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185
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186 return NGX_ERROR;
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187 }
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188
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189 if (ngx_create_path(&ctx->file, ctx->path) == NGX_ERROR) {
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190 return NGX_ERROR;
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191 }
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192
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193 retry = 1;
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194 }
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195 }
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196
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197
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198 int ngx_garbage_collector_http_cache_handler(ngx_gc_t *gc, ngx_str_t *name,
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199 ngx_dir_t *dir)
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200 {
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201 int rc;
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202 char data[sizeof(ngx_http_cache_header_t)];
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203 ngx_hunk_t buf;
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204 ngx_http_cache_ctx_t ctx;
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205
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206 ctx.file.fd = NGX_INVALID_FILE;
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207 ctx.file.name = *name;
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208 ctx.file.log = gc->log;
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209
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210 ctx.header_size = sizeof(ngx_http_cache_header_t);
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211 ctx.buf = &buf;
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212 ctx.log = gc->log;
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213 ctx.key.len = 0;
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214
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215 buf.type = NGX_HUNK_IN_MEMORY|NGX_HUNK_TEMP;
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216 buf.pos = data;
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217 buf.last = data;
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218 buf.start = data;
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219 buf.end = data + sizeof(ngx_http_cache_header_t);
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220
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221 rc = ngx_http_cache_open_file(&ctx, 0);
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222
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223 /* TODO: NGX_AGAIN */
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224
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225 if (rc != NGX_ERROR && rc != NGX_DECLINED && rc != NGX_HTTP_CACHE_STALE) {
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226 return NGX_OK;
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227 }
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228
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229 if (ngx_delete_file(name->data) == NGX_FILE_ERROR) {
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230 ngx_log_error(NGX_LOG_CRIT, gc->log, ngx_errno,
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231 ngx_delete_file_n " \"%s\" failed", name->data);
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232 return NGX_ERROR;
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233 }
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234
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235 gc->deleted++;
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236 gc->freed += ngx_de_size(dir);
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237
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238 return NGX_OK;
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239 }
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