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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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26
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25 ngx_int_t ngx_http_file_cache_get(ngx_http_request_t *r,
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26 ngx_http_cache_ctx_t *ctx)
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0
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27 {
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26
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28 ngx_uint_t i;
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29 ngx_str_t *key;
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30 ngx_http_cache_t *c;
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31 MD5_CTX md5;
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0
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32
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26
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33 c = r->cache;
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0
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34
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26
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35 c->file.name.len = ctx->path->name.len + 1 + ctx->path->len + 32;
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36 if (!(c->file.name.data = ngx_palloc(r->pool, c->file.name.len + 1))) {
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37 return NGX_ABORT;
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0
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38 }
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39
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40 MD5Init(&md5);
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26
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41
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42 key = c->key.elts;
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43 for (i = 0; i < c->key.nelts; i++) {
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44 MD5Update(&md5, key[i].data, key[i].len);
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45 }
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0
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46
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26
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47 MD5Update(&md5, ctx->key.data, ctx->key.len);
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48
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49 MD5Final(c->md5, &md5);
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50
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51 ngx_memcpy(c->file.name.data, ctx->path->name.data, ctx->path->name.len);
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52
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53 ngx_md5_text(c->file.name.data + ctx->path->name.len + 1 + ctx->path->len,
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54 c->md5);
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0
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55
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56 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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26
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57 "file cache key: %V, md5: %s", &ctx->key,
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58 c->file.name.data + ctx->path->name.len + 1 + ctx->path->len);
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0
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59
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26
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60 ngx_create_hashed_filename(&c->file, ctx->path);
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0
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61
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62 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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26
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63 "file cache name: %s", c->file.name.data);
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0
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64
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26
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65 return ngx_http_file_cache_open(r->cache);
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0
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66 }
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67
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68
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26
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69 ngx_int_t ngx_http_file_cache_open(ngx_http_cache_t *c)
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0
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70 {
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71 ssize_t n;
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72 ngx_err_t err;
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73 ngx_http_cache_header_t *h;
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74
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26
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75 c->file.fd = ngx_open_file(c->file.name.data,
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76 NGX_FILE_RDONLY, NGX_FILE_OPEN);
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0
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77
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26
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78 if (c->file.fd == NGX_INVALID_FILE) {
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0
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79 err = ngx_errno;
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80
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81 if (err == NGX_ENOENT || err == NGX_ENOTDIR) {
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82 return NGX_DECLINED;
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83 }
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84
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26
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85 ngx_log_error(NGX_LOG_CRIT, c->log, ngx_errno,
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86 ngx_open_file_n " \"%s\" failed", c->file.name.data);
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0
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87 return NGX_ERROR;
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88 }
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89
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26
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90 if (c->uniq) {
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91 if (ngx_fd_info(c->file.fd, &c->file.info) == NGX_FILE_ERROR) {
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92 ngx_log_error(NGX_LOG_CRIT, c->log, ngx_errno,
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93 ngx_fd_info_n " \"%s\" failed", c->file.name.data);
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0
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94
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95 return NGX_ERROR;
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96 }
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97
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26
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98 if (ngx_file_uniq(&c->file.info) == c->uniq) {
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99 if (ngx_close_file(c->file.fd) == NGX_FILE_ERROR) {
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100 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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0
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101 ngx_close_file_n " \"%s\" failed",
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26
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102 c->file.name.data);
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0
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103 }
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104
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105 return NGX_HTTP_CACHE_THE_SAME;
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106 }
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107 }
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108
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26
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109 n = ngx_read_file(&c->file, c->buf->pos, c->buf->end - c->buf->last, 0);
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0
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110
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111 if (n == NGX_ERROR || n == NGX_AGAIN) {
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112 return n;
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113 }
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114
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26
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115 if (n <= c->header_size) {
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116 ngx_log_error(NGX_LOG_CRIT, c->log, 0,
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117 "cache file \"%s\" is too small", c->file.name.data);
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0
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118 return NGX_ERROR;
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119 }
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120
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26
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121 h = (ngx_http_cache_header_t *) c->buf->pos;
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122 c->expires = h->expires;
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123 c->last_modified= h->last_modified;
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124 c->date = h->date;
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125 c->length = h->length;
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0
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126
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26
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127 if (h->key_len > (size_t) (c->buf->end - c->buf->pos)) {
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128 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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0
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129 "cache file \"%s\" is probably invalid",
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26
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130 c->file.name.data);
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0
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131 return NGX_DECLINED;
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132 }
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133
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26
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134 #if 0
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135
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136 /* TODO */
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137
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138 if (c->key_len && h->key_len != c->key_len) {
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139
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140 ngx_strncmp(h->key, c->key_data, h->key_len) != 0))
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141
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0
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142 h->key[h->key_len] = '\0';
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26
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143 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
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0
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144 "md5 collision: \"%s\" and \"%s\"",
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26
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145 h->key, c->key.data);
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0
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146 return NGX_DECLINED;
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147 }
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148
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26
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149 #endif
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0
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150
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26
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151 c->buf->last += n;
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0
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152
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26
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153 if (c->expires < ngx_time()) {
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154 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0,
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0
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155 "http file cache expired");
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156 return NGX_HTTP_CACHE_STALE;
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157 }
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158
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159 /* TODO: NGX_HTTP_CACHE_AGED */
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160
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26
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161 /* STUB */ return NGX_DECLINED;
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162
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0
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163 return NGX_OK;
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164 }
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165
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166
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26
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167 #if 0
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168
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169
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0
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170 int ngx_http_cache_update_file(ngx_http_request_t *r, ngx_http_cache_ctx_t *ctx,
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171 ngx_str_t *temp_file)
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172 {
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173 int retry;
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174 ngx_err_t err;
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175
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176 retry = 0;
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177
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178 for ( ;; ) {
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179 if (ngx_rename_file(temp_file->data, ctx->file.name.data) == NGX_OK) {
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180 return NGX_OK;
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181 }
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182
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183 err = ngx_errno;
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184
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10
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185 #if (NGX_WIN32)
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0
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186 if (err == NGX_EEXIST) {
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187 if (ngx_win32_rename_file(temp_file, &ctx->file.name, r->pool)
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188 == NGX_ERROR)
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189 {
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190 return NGX_ERROR;
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191 }
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192 }
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193 #endif
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194
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195 if (retry || (err != NGX_ENOENT && err != NGX_ENOTDIR)) {
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196 ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
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197 ngx_rename_file_n "(\"%s\", \"%s\") failed",
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198 temp_file->data, ctx->file.name.data);
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199
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200 return NGX_ERROR;
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201 }
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202
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203 if (ngx_create_path(&ctx->file, ctx->path) == NGX_ERROR) {
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204 return NGX_ERROR;
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205 }
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206
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207 retry = 1;
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208 }
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209 }
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210
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211
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26
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212 #endif
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213
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214
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215 ngx_int_t ngx_http_cache_cleaner_handler(ngx_gc_t *gc, ngx_str_t *name,
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216 ngx_dir_t *dir)
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0
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217 {
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26
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218 int rc;
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219 ngx_buf_t buf;
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220 ngx_http_cache_t c;
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221 u_char data[sizeof(ngx_http_cache_header_t)];
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0
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222
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26
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223 ngx_memzero(&c, sizeof(ngx_http_cache_t));
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224
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225 c.file.fd = NGX_INVALID_FILE;
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226 c.file.name = *name;
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227 c.file.log = gc->log;
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0
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228
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26
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229 c.header_size = sizeof(ngx_http_cache_header_t);
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230 c.buf = &buf;
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231 c.log = gc->log;
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232 c.key_len = 0;
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0
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233
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26
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234 buf.memory = 1;
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235 buf.temporary = 1;
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0
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236 buf.pos = data;
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237 buf.last = data;
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238 buf.start = data;
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239 buf.end = data + sizeof(ngx_http_cache_header_t);
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240
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241 rc = ngx_http_file_cache_open(&c);
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0
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242
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243 /* TODO: NGX_AGAIN */
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244
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245 if (rc != NGX_ERROR&& rc != NGX_DECLINED && rc != NGX_HTTP_CACHE_STALE) {
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0
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246 return NGX_OK;
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247 }
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248
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249 if (ngx_delete_file(name->data) == NGX_FILE_ERROR) {
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26
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250 ngx_log_error(NGX_LOG_CRIT, c.log, ngx_errno,
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0
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251 ngx_delete_file_n " \"%s\" failed", name->data);
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252 return NGX_ERROR;
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253 }
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254
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255 gc->deleted++;
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256 gc->freed += ngx_de_size(dir);
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257
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258 return NGX_OK;
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259 }
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