src/mod_staticfile.c

   1 #include "first.h"
   2
   3 #include "base.h"
   4 #include "log.h"
   5 #include "buffer.h"
   6
   7 #include "plugin.h"
   8
   9 #include "etag.h"
  10 #include "http_chunk.h"
  11 #include "response.h"
  12
  13 #include <stdlib.h>
  14 #include <string.h>
  15
  16 /**
  17  * this is a staticfile for a lighttpd plugin
  18  *
  19  */
  20
  21
  22
  23 /* plugin config for all request/connections */
  24
  25 typedef struct {
  26         array *exclude_ext;
  27         unsigned short etags_used;
  28         unsigned short disable_pathinfo;
  29 } plugin_config;
  30
  31 typedef struct {
  32         PLUGIN_DATA;
  33
  34         plugin_config **config_storage;
  35
  36         plugin_config conf;
  37 } plugin_data;
  38
  39 /* init the plugin data */
  40 INIT_FUNC(mod_staticfile_init) {
  41         plugin_data *p;
  42
  43         p = calloc(1, sizeof(*p));
  44
  45         return p;
  46 }
  47
  48 /* detroy the plugin data */
  49 FREE_FUNC(mod_staticfile_free) {
  50         plugin_data *p = p_d;
  51
  52         UNUSED(srv);
  53
  54         if (!p) return HANDLER_GO_ON;
  55
  56         if (p->config_storage) {
  57                 size_t i;
  58                 for (i = 0; i < srv->config_context->used; i++) {
  59                         plugin_config *s = p->config_storage[i];
  60
  61                         if (NULL == s) continue;
  62
  63                         array_free(s->exclude_ext);
  64
  65                         free(s);
  66                 }
  67                 free(p->config_storage);
  68         }
  69
  70         free(p);
  71
  72         return HANDLER_GO_ON;
  73 }
  74
  75 /* handle plugin config and check values */
  76
  77 SETDEFAULTS_FUNC(mod_staticfile_set_defaults) {
  78         plugin_data *p = p_d;
  79         size_t i = 0;
  80
  81         config_values_t cv[] = {
  82                 { "static-file.exclude-extensions", NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION },       /* 0 */
  83                 { "static-file.etags",    NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION }, /* 1 */
  84                 { "static-file.disable-pathinfo", NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION }, /* 2 */
  85                 { NULL,                         NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
  86         };
  87
  88         if (!p) return HANDLER_ERROR;
  89
  90         p->config_storage = calloc(1, srv->config_context->used * sizeof(plugin_config *));
  91
  92         for (i = 0; i < srv->config_context->used; i++) {
  93                 data_config const* config = (data_config const*)srv->config_context->data[i];
  94                 plugin_config *s;
  95
  96                 s = calloc(1, sizeof(plugin_config));
  97                 s->exclude_ext    = array_init();
  98                 s->etags_used     = 1;
  99                 s->disable_pathinfo = 0;
 100
 101                 cv[0].destination = s->exclude_ext;
 102                 cv[1].destination = &(s->etags_used);
 103                 cv[2].destination = &(s->disable_pathinfo);
 104
 105                 p->config_storage[i] = s;
 106
 107                 if (0 != config_insert_values_global(srv, config->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) {
 108                         return HANDLER_ERROR;
 109                 }
 110
 111                 if (!array_is_vlist(s->exclude_ext)) {
 112                         log_error_write(srv, __FILE__, __LINE__, "s",
 113                                         "unexpected value for static-file.exclude-extensions; expected list of \"ext\"");
 114                         return HANDLER_ERROR;
 115                 }
 116         }
 117
 118         return HANDLER_GO_ON;
 119 }
 120
 121 #define PATCH(x) \
 122         p->conf.x = s->x;
 123 static int mod_staticfile_patch_connection(server *srv, connection *con, plugin_data *p) {
 124         size_t i, j;
 125         plugin_config *s = p->config_storage[0];
 126
 127         PATCH(exclude_ext);
 128         PATCH(etags_used);
 129         PATCH(disable_pathinfo);
 130
 131         /* skip the first, the global context */
 132         for (i = 1; i < srv->config_context->used; i++) {
 133                 data_config *dc = (data_config *)srv->config_context->data[i];
 134                 s = p->config_storage[i];
 135
 136                 /* condition didn't match */
 137                 if (!config_check_cond(srv, con, dc)) continue;
 138
 139                 /* merge config */
 140                 for (j = 0; j < dc->value->used; j++) {
 141                         data_unset *du = dc->value->data[j];
 142
 143                         if (buffer_is_equal_string(du->key, CONST_STR_LEN("static-file.exclude-extensions"))) {
 144                                 PATCH(exclude_ext);
 145                         } else if (buffer_is_equal_string(du->key, CONST_STR_LEN("static-file.etags"))) {
 146                                 PATCH(etags_used);
 147                         } else if (buffer_is_equal_string(du->key, CONST_STR_LEN("static-file.disable-pathinfo"))) {
 148                                 PATCH(disable_pathinfo);
 149                         }
 150                 }
 151         }
 152
 153         return 0;
 154 }
 155 #undef PATCH
 156
 157 URIHANDLER_FUNC(mod_staticfile_subrequest) {
 158         plugin_data *p = p_d;
 159         size_t k;
 160         data_string *ds;
 161
 162         /* someone else has done a decision for us */
 163         if (con->http_status != 0) return HANDLER_GO_ON;
 164         if (buffer_is_empty(con->uri.path)) return HANDLER_GO_ON;
 165         if (buffer_is_empty(con->physical.path)) return HANDLER_GO_ON;
 166
 167         /* someone else has handled this request */
 168         if (con->mode != DIRECT) return HANDLER_GO_ON;
 169
 170         /* we only handle GET, POST and HEAD */
 171         switch(con->request.http_method) {
 172         case HTTP_METHOD_GET:
 173         case HTTP_METHOD_POST:
 174         case HTTP_METHOD_HEAD:
 175                 break;
 176         default:
 177                 return HANDLER_GO_ON;
 178         }
 179
 180         mod_staticfile_patch_connection(srv, con, p);
 181
 182         if (p->conf.disable_pathinfo && !buffer_string_is_empty(con->request.pathinfo)) {
 183                 if (con->conf.log_request_handling) {
 184                         log_error_write(srv, __FILE__, __LINE__,  "s",  "-- NOT handling file as static file, pathinfo forbidden");
 185                 }
 186                 return HANDLER_GO_ON;
 187         }
 188
 189         /* ignore certain extensions */
 190         for (k = 0; k < p->conf.exclude_ext->used; k++) {
 191                 ds = (data_string *)p->conf.exclude_ext->data[k];
 192
 193                 if (buffer_is_empty(ds->value)) continue;
 194
 195                 if (buffer_is_equal_right_len(con->physical.path, ds->value, buffer_string_length(ds->value))) {
 196                         if (con->conf.log_request_handling) {
 197                                 log_error_write(srv, __FILE__, __LINE__,  "s",  "-- NOT handling file as static file, extension forbidden");
 198                         }
 199                         return HANDLER_GO_ON;
 200                 }
 201         }
 202
 203
 204         if (con->conf.log_request_handling) {
 205                 log_error_write(srv, __FILE__, __LINE__,  "s",  "-- handling file as static file");
 206         }
 207
 208         if (!p->conf.etags_used) con->etag_flags = 0;
 209         http_response_send_file(srv, con, con->physical.path);
 210
 211         return HANDLER_FINISHED;
 212 }
 213
 214 /* this function is called at dlopen() time and inits the callbacks */
 215
 216 int mod_staticfile_plugin_init(plugin *p);
 217 int mod_staticfile_plugin_init(plugin *p) {
 218         p->version     = LIGHTTPD_VERSION_ID;
 219         p->name        = buffer_init_string("staticfile");
 220
 221         p->init        = mod_staticfile_init;
 222         p->handle_subrequest_start = mod_staticfile_subrequest;
 223         p->set_defaults  = mod_staticfile_set_defaults;
 224         p->cleanup     = mod_staticfile_free;
 225
 226         p->data        = NULL;
 227
 228         return 0;
 229 }