src/config.c

   1 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2
   3 /*  Monkey HTTP Daemon
   4  *  ------------------
   5  *  Copyright (C) 2001-2010, Eduardo Silva P. <edsiper@gmail.com>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU Library General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  */
  21
  22 #include <dirent.h>
  23 #include <stdio.h>
  24 #include <sys/types.h>
  25 #include <sys/socket.h>
  26 #include <netinet/in.h>
  27 #include <stdlib.h>
  28 #include <sys/stat.h>
  29 #include <unistd.h>
  30 #include <string.h>
  31 #include <fcntl.h>
  32 #include <ctype.h>
  33
  34 #include "monkey.h"
  35 #include "config.h"
  36 #include "str.h"
  37 #include "utils.h"
  38 #include "mimetype.h"
  39 #include "info.h"
  40 #include "memory.h"
  41 #include "plugin.h"
  42
  43 /* Raise a configuration error */
  44 void mk_config_error(const char *path, int line, const char *msg)
  45 {
  46     printf("\nReading %s", path);
  47     printf("\nError in line %i: %s\n\n", line, msg);
  48     fflush(stdout);
  49     exit(1);
  50 }
  51
  52 /* Returns a configuration section by [section name] */
  53 struct mk_config_section *mk_config_section_get(struct mk_config *conf,
  54                                                 const char *section_name)
  55 {
  56     struct mk_config_section *section;
  57
  58     section = conf->section;
  59     while (section) {
  60         if (strcasecmp(section->name, section_name) == 0) {
  61             return section;
  62         }
  63         section = section->next;
  64     }
  65
  66     return NULL;
  67 }
  68
  69 /* Register a new section into the configuration struct */
  70 void mk_config_section_add(struct mk_config *conf, char *section_name)
  71 {
  72     struct mk_config_section *new, *aux;
  73
  74     /* Alloc section node */
  75     new = mk_mem_malloc(sizeof(struct mk_config_section));
  76     new->name = mk_string_dup(section_name);
  77     new->entry = NULL;
  78     new->next = NULL;
  79
  80     if (!conf->section) {
  81         conf->section = new;
  82         return;
  83     }
  84
  85     /* go to last section available */
  86     aux = conf->section;
  87     while (aux->next) {
  88         aux = aux->next;
  89     }
  90
  91     aux->next = new;
  92     return;
  93 }
  94
  95 /* Register a key/value entry in the last section available of the struct */
  96 void mk_config_entry_add(struct mk_config *conf,
  97                          const char *key, const char *val)
  98 {
  99     struct mk_config_section *section;
 100     struct mk_config_entry *aux_entry, *new_entry;
 101
 102     if (!conf->section) {
 103         puts("Error: there are not sections available!");
 104         exit(1);
 105     }
 106
 107     /* Go to last section */
 108     section = conf->section;
 109     while (section->next) {
 110         section = section->next;
 111     }
 112
 113     /* Alloc new entry */
 114     new_entry = mk_mem_malloc(sizeof(struct mk_config_entry));
 115     new_entry->key = mk_string_dup(key);
 116     new_entry->val = mk_string_dup(val);
 117     new_entry->next = NULL;
 118
 119     /* Add first entry */
 120     if (!section->entry) {
 121         section->entry = new_entry;
 122         return;
 123     }
 124
 125     /* Go to last entry */
 126     aux_entry = section->entry;
 127     while (aux_entry->next) {
 128         aux_entry = aux_entry->next;
 129     }
 130
 131     aux_entry->next = new_entry;
 132 }
 133
 134 struct mk_config *mk_config_create(const char *path)
 135 {
 136     int len;
 137     int line = 0;
 138     int indent_len = -1;
 139     char buf[255];
 140     char *section = 0;
 141     char *indent = 0;
 142     char *key, *val, *last;
 143     struct mk_config *conf = 0;
 144     FILE *f;
 145
 146     /* Open configuration file */
 147     if ((f = fopen(path, "r")) == NULL) {
 148         fprintf(stderr, "\nConfig Error: I can't open %s file\n\n", path);
 149         exit(1);
 150     }
 151
 152     /* Alloc configuration node */
 153     conf = mk_mem_malloc(sizeof(struct mk_config));
 154     conf->created = time(NULL);
 155     conf->file = mk_string_dup(path);
 156     conf->section = NULL;
 157
 158     /* looking for configuration directives */
 159     while (fgets(buf, 255, f)) {
 160         len = strlen(buf);
 161         if (buf[len - 1] == '\n') {
 162             buf[--len] = 0;
 163             if (len && buf[len - 1] == '\r') {
 164                 buf[--len] = 0;
 165             }
 166         }
 167
 168         /* Line number */
 169         line++;
 170
 171         if (!buf[0]) {
 172             continue;
 173         }
 174
 175         /* Skip commented lines */
 176         if (buf[0] == '#') {
 177             if (section) {
 178                 mk_mem_free(section);
 179                 section = NULL;
 180             }
 181             continue;
 182         }
 183
 184         /* Section definition */
 185         if (buf[0] == '[') {
 186             int end = -1;
 187             end = mk_string_char_search(buf, ']', len);
 188             if (end > 0) {
 189                 section = mk_string_copy_substr(buf, 1, end);
 190                 mk_config_section_add(conf, section);
 191                 continue;
 192             }
 193             else {
 194                 mk_config_error(path, line, "Bad header definition");
 195             }
 196         }
 197         else {
 198             /* No separator defined */
 199             if (!indent) {
 200                 int i = 0;
 201
 202                 do { i++; } while (i < len && isblank(buf[i]));
 203
 204                 indent = mk_string_copy_substr(buf, 0, i);
 205                 indent_len = strlen(indent);
 206
 207                 /* Blank indented line */
 208                 if (i == len) {
 209                     continue;
 210                 }
 211             }
 212
 213             /* Validate indentation level */
 214             if (strncmp(buf, indent, indent_len) != 0 || !section ||
 215                 isblank(buf[indent_len]) != 0) {
 216                 mk_config_error(path, line, "Invalid indentation level");
 217             }
 218
 219             if (buf[indent_len] == '#' || indent_len == len) {
 220                 continue;
 221             }
 222
 223             /* get line key and value */
 224             key = strtok_r(buf + indent_len, "\"\t ", &last);
 225             val = strtok_r(NULL, "\"\t", &last);
 226
 227             if (!key || !val) {
 228                 mk_config_error(path, line, "Each key must have a value");
 229                 continue;
 230             }
 231
 232             /* Register entry */
 233             mk_config_entry_add(conf, key, val);
 234         }
 235     }
 236
 237     /*
 238     struct mk_config_section *s;
 239     struct mk_config_entry *e;
 240
 241     s = conf->section;
 242     while(s) {
 243         printf("\n[%s]", s->name);
 244         e = s->entry;
 245         while(e) {
 246             printf("\n   %s = %s", e->key, e->val);
 247             e = e->next;
 248         }
 249         s = s->next;
 250     }
 251     fflush(stdout);
 252     */
 253
 254     fclose(f);
 255     return conf;
 256 }
 257
 258 void mk_config_free(struct mk_config *conf)
 259 {
 260     struct mk_config_section *prev=0, *section;
 261
 262     /* Free sections */
 263     section = conf->section;
 264     while (section) {
 265         while (section->next) {
 266             prev = section;
 267             section = section->next;
 268         }
 269
 270         /* Free section entries */
 271         mk_config_free_entries(section);
 272
 273         /* Free section node */
 274         mk_mem_free(section->name);
 275         mk_mem_free(section);
 276
 277         if (section == conf->section) {
 278             return;
 279         }
 280         prev->next = NULL;
 281         section = conf->section;
 282     }
 283 }
 284
 285 void mk_config_free_entries(struct mk_config_section *section)
 286 {
 287     struct mk_config_entry *prev = 0, *target;
 288
 289     target = section->entry;
 290     while (target) {
 291         while (target->next) {
 292             prev = target;
 293             target = target->next;
 294         }
 295
 296         /* Free memory assigned */
 297         mk_mem_free(target->key);
 298         mk_mem_free(target->val);
 299
 300         if (target == section->entry) {
 301             section->entry = NULL;
 302             return;
 303         }
 304
 305         prev->next = NULL;
 306         target = section->entry;
 307     }
 308 }
 309
 310 void *mk_config_section_getval(struct mk_config_section *section, char *key, int mode)
 311 {
 312     int on, off;
 313     struct mk_config_entry *entry;
 314
 315     entry = section->entry;
 316     while (entry) {
 317         if (strcasecmp(entry->key, key) == 0) {
 318             switch (mode) {
 319             case MK_CONFIG_VAL_STR:
 320                 return (void *) entry->val;
 321             case MK_CONFIG_VAL_NUM:
 322                 return (void *) atoi(entry->val);
 323             case MK_CONFIG_VAL_BOOL:
 324                 on = strcasecmp(entry->val, VALUE_ON);
 325                 off = strcasecmp(entry->val, VALUE_OFF);
 326
 327                 if (on != 0 && off != 0) {
 328                     return (void *) -1;
 329                 }
 330                 else if (on >= 0) {
 331                     return (void *) VAR_ON;
 332                 }
 333                 else {
 334                     return (void *) VAR_OFF;
 335                 }
 336             case MK_CONFIG_VAL_LIST:
 337                 return mk_string_split_line(entry->val);
 338             }
 339         }
 340         else {
 341             entry = entry->next;
 342         }
 343     }
 344     return NULL;
 345 }
 346
 347 /* Read configuration files */
 348 void mk_config_read_files(char *path_conf, char *file_conf)
 349 {
 350     unsigned long len;
 351     char *path = 0;
 352     struct stat checkdir;
 353     struct mk_config *cnf;
 354     struct mk_config_section *section;
 355     struct mk_string_line *line, *line_val;
 356
 357     config->serverconf = mk_string_dup(path_conf);
 358     config->workers = MK_WORKERS_DEFAULT;
 359
 360     if (stat(config->serverconf, &checkdir) == -1) {
 361         fprintf(stderr, "\nERROR: Invalid path to configuration files");
 362         fprintf(stderr, "\nCannot find/open '%s'\n", config->serverconf);
 363         exit(1);
 364     }
 365
 366     mk_string_build(&path, &len, "%s/%s", path_conf, file_conf);
 367
 368     cnf = mk_config_create(path);
 369     section = mk_config_section_get(cnf, "SERVER");
 370
 371     if (!section) {
 372         fprintf(stderr, "\nERROR: No 'SERVER' section defined");
 373         exit(1);
 374     }
 375
 376     /* Map source configuration */
 377     config->config = cnf;
 378
 379     /* Listen */
 380     config->listen_addr = mk_config_section_getval(section, "Listen",
 381                                                    MK_CONFIG_VAL_STR);
 382     if (!config->listen_addr) {
 383         config->listen_addr = MK_DEFAULT_LISTEN_ADDR;
 384     }
 385
 386     /* Connection port */
 387     config->serverport = (int) mk_config_section_getval(section,
 388                                                         "Port",
 389                                                         MK_CONFIG_VAL_NUM);
 390     if (!config->serverport >= 1 && !config->serverport <= 65535) {
 391         mk_config_print_error_msg("Port", path);
 392     }
 393
 394     /* Number of thread workers */
 395     config->workers = (int) mk_config_section_getval(section,
 396                                                      "Workers",
 397                                                      MK_CONFIG_VAL_NUM);
 398     if (config->workers < 1) {
 399         mk_config_print_error_msg("Workers", path);
 400     }
 401
 402     /* Timeout */
 403     config->timeout = (int) mk_config_section_getval(section,
 404                                                      "Timeout", MK_CONFIG_VAL_NUM);
 405     if (config->timeout < 1) {
 406         mk_config_print_error_msg("Timeout", path);
 407     }
 408
 409     /* KeepAlive */
 410     config->keep_alive = (int) mk_config_section_getval(section,
 411                                                         "KeepAlive",
 412                                                         MK_CONFIG_VAL_BOOL);
 413     if (config->keep_alive == VAR_ERR) {
 414         mk_config_print_error_msg("KeepAlive", path);
 415     }
 416
 417     /* MaxKeepAliveRequest */
 418     config->max_keep_alive_request = (int)
 419         mk_config_section_getval(section,
 420                                  "MaxKeepAliveRequest",
 421                                  MK_CONFIG_VAL_NUM);
 422
 423     if (config->max_keep_alive_request == 0) {
 424         mk_config_print_error_msg("MaxKeepAliveRequest", path);
 425     }
 426
 427     /* KeepAliveTimeout */
 428     config->keep_alive_timeout = (int) mk_config_section_getval(section,
 429                                                                 "KeepAliveTimeout",
 430                                                                 MK_CONFIG_VAL_NUM);
 431     if (config->keep_alive_timeout == 0) {
 432         mk_config_print_error_msg("KeepAliveTimeout", path);
 433     }
 434
 435     /* Pid File */
 436     config->pid_file_path = mk_config_section_getval(section,
 437                                                      "PidFile", MK_CONFIG_VAL_STR);
 438
 439     /* Home user's directory /~ */
 440     config->user_dir = mk_config_section_getval(section,
 441                                                 "UserDir", MK_CONFIG_VAL_STR);
 442
 443     /* Index files */
 444     line_val = line = mk_config_section_getval(section,
 445                                                "Indexfile", MK_CONFIG_VAL_LIST);
 446     while (line_val != NULL) {
 447         mk_config_add_index(line_val->val);
 448         line_val = line_val->next;
 449     }
 450
 451     /* HideVersion Variable */
 452     config->hideversion = (int) mk_config_section_getval(section,
 453                                                          "HideVersion",
 454                                                          MK_CONFIG_VAL_BOOL);
 455     if (config->hideversion == VAR_ERR) {
 456         mk_config_print_error_msg("HideVersion", path);
 457     }
 458
 459     /* User Variable */
 460     config->user = mk_config_section_getval(section, "User", MK_CONFIG_VAL_STR);
 461
 462     /* Resume */
 463     config->resume = (int) mk_config_section_getval(section,
 464                                                     "Resume", MK_CONFIG_VAL_BOOL);
 465     if (config->resume == VAR_ERR) {
 466         mk_config_print_error_msg("Resume", path);
 467     }
 468
 469     /* Symbolic Links */
 470     config->symlink = (int) mk_config_section_getval(section,
 471                                                      "SymLink", MK_CONFIG_VAL_BOOL);
 472     if (config->symlink == VAR_ERR) {
 473         mk_config_print_error_msg("SymLink", path);
 474     }
 475
 476     mk_mem_free(path);
 477     mk_config_read_hosts(path_conf);
 478 }
 479
 480 void mk_config_read_hosts(char *path)
 481 {
 482     DIR *dir;
 483     unsigned long len;
 484     char *buf = 0;
 485     char *file;
 486     struct host *p_host, *new_host;     /* debug */
 487     struct dirent *ent;
 488
 489     mk_string_build(&buf, &len, "%s/sites/default", path);
 490     config->hosts = mk_config_get_host(buf);
 491     config->nhosts++;
 492     mk_mem_free(buf);
 493
 494     if (!config->hosts) {
 495         printf("\nError parsing main configuration file 'default'\n");
 496         exit(1);
 497     }
 498
 499     mk_string_build(&buf, &len, "%s/sites/", path);
 500     if (!(dir = opendir(buf)))
 501         exit(1);
 502
 503
 504     p_host = config->hosts;
 505
 506     /* Reading content */
 507     while ((ent = readdir(dir)) != NULL) {
 508         if (strcmp((char *) ent->d_name, ".") == 0)
 509             continue;
 510         if (strcmp((char *) ent->d_name, "..") == 0)
 511             continue;
 512         if (strcasecmp((char *) ent->d_name, "default") == 0)
 513             continue;
 514
 515         mk_string_build(&file, &len, "%s/sites/%s", path, ent->d_name);
 516
 517         new_host = (struct host *) mk_config_get_host(file);
 518         mk_mem_free(file);
 519         if (!new_host) {
 520             continue;
 521         }
 522         else {
 523             p_host->next = new_host;
 524             p_host = new_host;
 525             config->nhosts++;
 526         }
 527     }
 528     closedir(dir);
 529 }
 530
 531 struct host *mk_config_get_host(char *path)
 532 {
 533     unsigned long len = 0;
 534     struct stat checkdir;
 535     struct host *host;
 536     struct mk_config *cnf;
 537     struct mk_config_section *section;
 538
 539     /* Read configuration file */
 540     cnf = mk_config_create(path);
 541
 542     /* Read tag 'HOST' */
 543     section = mk_config_section_get(cnf, "HOST");
 544
 545     /* Alloc configuration node */
 546     host = mk_mem_malloc_z(sizeof(struct host));
 547     host->config = cnf;
 548     host->file = mk_string_dup(path);
 549     host->servername = mk_config_section_getval(section, "Servername",
 550                                                 MK_CONFIG_VAL_STR);
 551
 552     /* document root handled by a mk_pointer */
 553     host->documentroot.data = mk_config_section_getval(section,
 554                                                        "DocumentRoot",
 555                                                        MK_CONFIG_VAL_STR);
 556     host->documentroot.len = strlen(host->documentroot.data);
 557
 558     /* validate document root configured */
 559     if (stat(host->documentroot.data, &checkdir) == -1) {
 560         fprintf(stderr, "ERROR: Invalid path to DocumentRoot in %s\n\n", path);
 561         exit(1);
 562     }
 563     else if (!(checkdir.st_mode & S_IFDIR)) {
 564         fprintf(stderr,
 565                 "ERROR: DocumentRoot variable in %s has an invalid directory path\n\n",
 566                 path);
 567         exit(1);
 568     }
 569
 570     if (!host->servername) {
 571         mk_config_free(cnf);
 572         return NULL;
 573     }
 574
 575     /* Server Signature */
 576     if (config->hideversion == VAR_OFF) {
 577         mk_string_build(&host->host_signature, &len,
 578                         "Monkey/%s", VERSION);
 579     }
 580     else {
 581         mk_string_build(&host->host_signature, &len, "Monkey");
 582     }
 583     mk_string_build(&host->header_host_signature.data,
 584                     &host->header_host_signature.len,
 585                     "Server: %s", host->host_signature);
 586
 587
 588     /* Access log */
 589     host->access_log_path = mk_config_section_getval(section,
 590                                                      "AccessLog",
 591                                                      MK_CONFIG_VAL_STR);
 592     /* Error log */
 593     host->error_log_path = mk_config_section_getval(section,
 594                                                     "ErrorLog",
 595                                                     MK_CONFIG_VAL_STR);
 596     host->next = NULL;
 597     return host;
 598 }
 599
 600 /* Imprime error de configuracion y cierra */
 601 void mk_config_print_error_msg(char *variable, char *path)
 602 {
 603     fprintf(stderr, "\nError: %s variable in %s has an invalid value.\n",
 604             variable, path);
 605     fflush(stderr);
 606     exit(1);
 607 }
 608
 609 /* Agrega distintos index.xxx */
 610 void mk_config_add_index(char *indexname)
 611 {
 612     struct indexfile *new_index = 0, *aux_index;
 613
 614     new_index = (struct indexfile *) malloc(sizeof(struct indexfile));
 615     strncpy(new_index->indexname, indexname, MAX_INDEX_NOMBRE - 1);
 616     new_index->indexname[MAX_INDEX_NOMBRE - 1] = '\0';
 617     new_index->next = NULL;
 618
 619     if (first_index == NULL) {
 620         first_index = new_index;
 621     }
 622     else {
 623         aux_index = first_index;
 624         while (aux_index->next != NULL)
 625             aux_index = aux_index->next;
 626         aux_index->next = new_index;
 627     }
 628 }
 629
 630 void mk_config_set_init_values(void)
 631 {
 632     /* Init values */
 633     config->timeout = 15;
 634     config->hideversion = VAR_OFF;
 635     config->keep_alive = VAR_ON;
 636     config->keep_alive_timeout = 15;
 637     config->max_keep_alive_request = 50;
 638     config->resume = VAR_ON;
 639     config->standard_port = 80;
 640     config->listen_addr = MK_DEFAULT_LISTEN_ADDR;
 641     config->serverport = 2001;
 642     config->symlink = VAR_OFF;
 643     config->nhosts = 0;
 644     config->user = NULL;
 645     config->open_flags = O_RDONLY | O_NONBLOCK;
 646
 647     /* Plugins */
 648     config->plugins = NULL;
 649 }
 650
 651 /* read main configuration from monkey.conf */
 652 void mk_config_start_configure(void)
 653 {
 654     unsigned long len;
 655
 656     mk_config_set_init_values();
 657     mk_config_read_files(config->file_config, M_DEFAULT_CONFIG_FILE);
 658
 659     /* if not index names defined, set default */
 660     if (first_index == NULL) {
 661         mk_config_add_index("index.html");
 662     }
 663
 664     /* Load mimes */
 665     mk_mimetype_read_config();
 666
 667     /* Basic server information */
 668     if (config->hideversion == VAR_OFF) {
 669         mk_string_build(&config->server_software.data,
 670                         &len, "Monkey/%s (%s)", VERSION, OS);
 671         config->server_software.len = len;
 672     }
 673     else {
 674         mk_string_build(&config->server_software.data, &len, "Monkey Server");
 675         config->server_software.len = len;
 676     }
 677 }
 678
 679 struct host *mk_config_host_find(mk_pointer host)
 680 {
 681     struct host *aux_host;
 682
 683     aux_host = config->hosts;
 684
 685     while (aux_host) {
 686         if (strncasecmp(aux_host->servername, host.data, host.len) == 0) {
 687             return aux_host;
 688         }
 689         aux_host = aux_host->next;
 690     }
 691
 692     return NULL;
 693 }
 694
 695 void mk_config_sanity_check()
 696 {
 697     /* Check O_NOATIME for current user, flag will just be used
 698      * if running user is allowed to.
 699      */
 700     int fd, flags = config->open_flags;
 701
 702     flags |= O_NOATIME;
 703     fd = open(config->file_config, flags);
 704
 705     if (fd > -1) {
 706         config->open_flags = flags;
 707         close(fd);
 708     }
 709 }