1 #include "first.h" 2 3 #include "base.h" 4 #include "plugin.h" 5 #include "log.h" 6 #include "stat_cache.h" 7 8 #include <stdlib.h> 9 #include <string.h> 10 #include <errno.h> 11 12 typedef struct { 13 /* unparsed pieces */ 14 buffer *path_pieces_raw; 15 16 /* pieces for path creation */ 17 size_t len; 18 buffer **path_pieces; 19 } plugin_config; 20 21 typedef struct { 22 PLUGIN_DATA; 23 buffer *tmp_buf; 24 25 plugin_config **config_storage; 26 plugin_config conf; 27 } plugin_data; 28 29 INIT_FUNC(mod_evhost_init) { 30 plugin_data *p; 31 32 p = calloc(1, sizeof(*p)); 33 34 p->tmp_buf = buffer_init(); 35 36 return p; 37 } 38 39 FREE_FUNC(mod_evhost_free) { 40 plugin_data *p = p_d; 41 42 UNUSED(srv); 43 44 if (!p) return HANDLER_GO_ON; 45 46 if (p->config_storage) { 47 size_t i; 48 for (i = 0; i < srv->config_context->used; i++) { 49 plugin_config *s = p->config_storage[i]; 50 51 if (NULL == s) continue; 52 53 if(s->path_pieces) { 54 size_t j; 55 for (j = 0; j < s->len; j++) { 56 buffer_free(s->path_pieces[j]); 57 } 58 59 free(s->path_pieces); 60 } 61 62 buffer_free(s->path_pieces_raw); 63 64 free(s); 65 } 66 free(p->config_storage); 67 } 68 69 buffer_free(p->tmp_buf); 70 71 free(p); 72 73 return HANDLER_GO_ON; 74 } 75 76 static int mod_evhost_parse_pattern(plugin_config *s) { 77 char *ptr = s->path_pieces_raw->ptr,*pos; 78 79 s->path_pieces = NULL; 80 81 for(pos=ptr;*ptr;ptr++) { 82 if(*ptr == '%') { 83 size_t len; 84 s->path_pieces = realloc(s->path_pieces,(s->len+2) * sizeof(*s->path_pieces)); 85 s->path_pieces[s->len] = buffer_init(); 86 s->path_pieces[s->len+1] = buffer_init(); 87 88 /* "%%" "%_" "%x" "%{x.y}" where x and y are *single digit* 0 - 9 */ 89 if (ptr[1] == '%' || ptr[1] == '_' || light_isdigit(ptr[1])) { 90 len = 2; 91 } else if (ptr[1] == '{') { 92 if (!light_isdigit(ptr[2])) return -1; 93 if (ptr[3] == '.') { 94 if (!light_isdigit(ptr[4])) return -1; 95 if (ptr[5] != '}') return -1; 96 len = 6; 97 } else if (ptr[3] == '}') { 98 len = 4; 99 } else { 100 return -1; 101 } 102 } else { 103 return -1; 104 } 105 106 buffer_copy_string_len(s->path_pieces[s->len],pos,ptr-pos); 107 pos = ptr + len; 108 109 buffer_copy_string_len(s->path_pieces[s->len+1],ptr,len); 110 ptr += len - 1; /*(ptr++ in for() loop)*/ 111 112 s->len += 2; 113 } 114 } 115 116 if(*pos != '\0') { 117 s->path_pieces = realloc(s->path_pieces,(s->len+1) * sizeof(*s->path_pieces)); 118 s->path_pieces[s->len] = buffer_init(); 119 120 buffer_copy_string_len(s->path_pieces[s->len],pos,ptr-pos); 121 122 s->len += 1; 123 } 124 125 return 0; 126 } 127 128 SETDEFAULTS_FUNC(mod_evhost_set_defaults) { 129 plugin_data *p = p_d; 130 size_t i; 131 132 /** 133 * 134 * # 135 * # define a pattern for the host url finding 136 * # %% => % sign 137 * # %0 => domain name + tld 138 * # %1 => tld 139 * # %2 => domain name without tld 140 * # %3 => subdomain 1 name 141 * # %4 => subdomain 2 name 142 * # %_ => fqdn (without port info) 143 * # 144 * evhost.path-pattern = "/home/ckruse/dev/www/%3/htdocs/" 145 * 146 */ 147 148 config_values_t cv[] = { 149 { "evhost.path-pattern", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION }, 150 { NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET } 151 }; 152 153 if (!p) return HANDLER_ERROR; 154 155 p->config_storage = calloc(srv->config_context->used, sizeof(plugin_config *)); 156 157 for (i = 0; i < srv->config_context->used; i++) { 158 data_config const* config = (data_config const*)srv->config_context->data[i]; 159 plugin_config *s; 160 161 s = calloc(1, sizeof(plugin_config)); 162 s->path_pieces_raw = buffer_init(); 163 s->path_pieces = NULL; 164 s->len = 0; 165 166 cv[0].destination = s->path_pieces_raw; 167 168 p->config_storage[i] = s; 169 170 if (0 != config_insert_values_global(srv, config->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) { 171 return HANDLER_ERROR; 172 } 173 174 if (!buffer_string_is_empty(s->path_pieces_raw)) { 175 if (0 != mod_evhost_parse_pattern(s)) { 176 log_error_write(srv, __FILE__, __LINE__, "sb", "invalid evhost.path-pattern:", s->path_pieces_raw); 177 return HANDLER_ERROR; 178 } 179 } 180 } 181 182 return HANDLER_GO_ON; 183 } 184 185 /** 186 * assign the different parts of the domain to array-indezes (sub2.sub1.domain.tld) 187 * - %0 - domain.tld 188 * - %1 - tld 189 * - %2 - domain 190 * - %3 - sub1 191 * - ... 192 */ 193 194 static void mod_evhost_parse_host(buffer *key, array *host, buffer *authority) { 195 char *ptr = authority->ptr + buffer_string_length(authority); 196 char *colon = ptr; /* needed to filter out the colon (if exists) */ 197 int first = 1; 198 int i; 199 200 /*if (ptr == authority->ptr) return;*//*(no authority checked earlier)*/ 201 202 if (*authority->ptr == '[') { /* authority is IPv6 literal address */ 203 colon = ptr; 204 if (ptr[-1] != ']') { 205 do { --ptr; } while (ptr > authority->ptr && ptr[-1] != ']'); 206 if (*ptr != ':') return; /*(should not happen for valid authority)*/ 207 colon = ptr; 208 } 209 ptr = authority->ptr; 210 array_insert_key_value(host,CONST_STR_LEN("%0"),ptr,colon-ptr); 211 return; 212 } 213 214 /* first, find the domain + tld */ 215 for(; ptr > authority->ptr; --ptr) { 216 if(*ptr == '.') { 217 if(first) first = 0; 218 else break; 219 } else if(*ptr == ':') { 220 colon = ptr; 221 first = 1; 222 } 223 } 224 225 /* if we stopped at a dot, skip the dot */ 226 if (*ptr == '.') ptr++; 227 array_insert_key_value(host, CONST_STR_LEN("%0"), ptr, colon-ptr); 228 229 /* if the : is not the start of the authority, go on parsing the hostname */ 230 231 if (colon != authority->ptr) { 232 for(ptr = colon - 1, i = 1; ptr > authority->ptr; --ptr) { 233 if(*ptr == '.') { 234 if (ptr != colon - 1) { 235 /* is something between the dots */ 236 buffer_copy_string_len(key, CONST_STR_LEN("%")); 237 buffer_append_int(key, i++); 238 array_insert_key_value(host, CONST_BUF_LEN(key), ptr+1, colon-ptr-1); 239 } 240 colon = ptr; 241 } 242 } 243 244 /* if the . is not the first charactor of the hostname */ 245 if (colon != ptr) { 246 buffer_copy_string_len(key, CONST_STR_LEN("%")); 247 buffer_append_int(key, i /* ++ */); 248 array_insert_key_value(host, CONST_BUF_LEN(key), ptr, colon-ptr); 249 } 250 } 251 } 252 253 #define PATCH(x) \ 254 p->conf.x = s->x; 255 static int mod_evhost_patch_connection(server *srv, connection *con, plugin_data *p) { 256 size_t i, j; 257 plugin_config *s = p->config_storage[0]; 258 259 PATCH(path_pieces); 260 PATCH(len); 261 262 /* skip the first, the global context */ 263 for (i = 1; i < srv->config_context->used; i++) { 264 data_config *dc = (data_config *)srv->config_context->data[i]; 265 s = p->config_storage[i]; 266 267 /* condition didn't match */ 268 if (!config_check_cond(srv, con, dc)) continue; 269 270 /* merge config */ 271 for (j = 0; j < dc->value->used; j++) { 272 data_unset *du = dc->value->data[j]; 273 274 if (buffer_is_equal_string(du->key, CONST_STR_LEN("evhost.path-pattern"))) { 275 PATCH(path_pieces); 276 PATCH(len); 277 } 278 } 279 } 280 281 return 0; 282 } 283 #undef PATCH 284 285 286 static void mod_evhost_build_doc_root_path(buffer *b, array *parsed_host, buffer *authority, buffer **path_pieces, const size_t npieces) { 287 array_reset_data_strings(parsed_host); 288 mod_evhost_parse_host(b, parsed_host, authority); 289 buffer_clear(b); 290 291 for (size_t i = 0; i < npieces; ++i) { 292 const char *ptr = path_pieces[i]->ptr; 293 if (*ptr == '%') { 294 data_string *ds; 295 296 if (*(ptr+1) == '%') { 297 /* %% */ 298 buffer_append_string_len(b, CONST_STR_LEN("%")); 299 } else if (*(ptr+1) == '_' ) { 300 /* %_ == full hostname */ 301 char *colon = strchr(authority->ptr, ':'); 302 303 if(colon == NULL) { 304 buffer_append_string_buffer(b, authority); /* adds fqdn */ 305 } else { 306 /* strip the port out of the authority-part of the URI scheme */ 307 buffer_append_string_len(b, authority->ptr, colon - authority->ptr); /* adds fqdn */ 308 } 309 } else if (ptr[1] == '{' ) { 310 char s[3] = "% "; 311 s[1] = ptr[2]; /*(assumes single digit before '.', and, optionally, '.' and single digit after '.')*/ 312 if (NULL != (ds = (data_string *)array_get_element_klen(parsed_host, s, 2))) { 313 if (ptr[3] != '.' || ptr[4] == '0') { 314 buffer_append_string_buffer(b, ds->value); 315 } else { 316 if ((size_t)(ptr[4]-'0') <= buffer_string_length(ds->value)) { 317 buffer_append_string_len(b, ds->value->ptr+(ptr[4]-'0')-1, 1); 318 } 319 } 320 } else { 321 /* unhandled %-sequence */ 322 } 323 } else if (NULL != (ds = (data_string *)array_get_element_klen(parsed_host, CONST_BUF_LEN(path_pieces[i])))) { 324 buffer_append_string_buffer(b, ds->value); 325 } else { 326 /* unhandled %-sequence */ 327 } 328 } else { 329 buffer_append_string_buffer(b, path_pieces[i]); 330 } 331 } 332 333 buffer_append_slash(b); 334 } 335 336 static handler_t mod_evhost_uri_handler(server *srv, connection *con, void *p_d) { 337 plugin_data *p = p_d; 338 stat_cache_entry *sce = NULL; 339 340 /* not authority set */ 341 if (buffer_string_is_empty(con->uri.authority)) return HANDLER_GO_ON; 342 343 mod_evhost_patch_connection(srv, con, p); 344 345 /* missing even default(global) conf */ 346 if (0 == p->conf.len) { 347 return HANDLER_GO_ON; 348 } 349 350 mod_evhost_build_doc_root_path(p->tmp_buf, srv->split_vals, con->uri.authority, p->conf.path_pieces, p->conf.len); 351 352 if (HANDLER_ERROR == stat_cache_get_entry(srv, con, p->tmp_buf, &sce)) { 353 log_error_write(srv, __FILE__, __LINE__, "sb", strerror(errno), p->tmp_buf); 354 } else if(!S_ISDIR(sce->st.st_mode)) { 355 log_error_write(srv, __FILE__, __LINE__, "sb", "not a directory:", p->tmp_buf); 356 } else { 357 buffer_copy_buffer(con->physical.doc_root, p->tmp_buf); 358 } 359 360 return HANDLER_GO_ON; 361 } 362 363 int mod_evhost_plugin_init(plugin *p); 364 int mod_evhost_plugin_init(plugin *p) { 365 p->version = LIGHTTPD_VERSION_ID; 366 p->name = buffer_init_string("evhost"); 367 p->init = mod_evhost_init; 368 p->set_defaults = mod_evhost_set_defaults; 369 p->handle_docroot = mod_evhost_uri_handler; 370 p->cleanup = mod_evhost_free; 371 372 p->data = NULL; 373 374 return 0; 375 } 376 377 /* eof */ 378