src/inspircd_io.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  Inspire is copyright (C) 2002-2004 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 using namespace std;
  18
  19 #include "inspircd_config.h"
  20 #include <sys/time.h>
  21 #include <sys/resource.h>
  22 #include <sys/types.h>
  23 #include <string>
  24 #include <unistd.h>
  25 #include <sstream>
  26 #include <iostream>
  27 #include <fstream>
  28 #include "inspircd.h"
  29 #include "inspircd_io.h"
  30 #include "inspircd_util.h"
  31 #include "inspstring.h"
  32 #include "helperfuncs.h"
  33
  34 extern FILE *log_file;
  35 extern int boundPortCount;
  36 extern int openSockfd[MAXSOCKS];
  37 extern time_t TIME;
  38 extern bool unlimitcore;
  39 extern int MaxConn;
  40 std::vector<std::string> include_stack;
  41
  42 void WriteOpers(char* text, ...);
  43
  44 void Exit (int status)
  45 {
  46         if (log_file)
  47                 fclose(log_file);
  48         send_error("Server shutdown.");
  49         exit (status);
  50 }
  51
  52 void Killed(int status)
  53 {
  54         if (log_file)
  55                 fclose(log_file);
  56         send_error("Server terminated.");
  57         exit(status);
  58 }
  59
  60 void Rehash(int status)
  61 {
  62         WriteOpers("Rehashing config file %s due to SIGHUP",CONFIG_FILE);
  63         ReadConfig(false,NULL);
  64 }
  65
  66
  67
  68 void Start (void)
  69 {
  70         printf("\033[1;32mInspire Internet Relay Chat Server, compiled %s at %s\n",__DATE__,__TIME__);
  71         printf("(C) ChatSpike Development team.\033[0m\n\n");
  72         printf("Developers:\033[1;32m     Brain, FrostyCoolSlug\033[0m\n");
  73         printf("Documentation:\033[1;32m  FrostyCoolSlug, w00t\033[0m\n");
  74         printf("Testers:\033[1;32m        typobox43, piggles, Lord_Zathras, CC\033[0m\n");
  75         printf("Name concept:\033[1;32m   Lord_Zathras\033[0m\n\n");
  76 }
  77
  78 void WritePID(std::string filename)
  79 {
  80         ofstream outfile(filename.c_str());
  81         if (outfile.is_open())
  82         {
  83                 outfile << getpid();
  84                 outfile.close();
  85         }
  86         else
  87         {
  88                 printf("Failed to write PID-file '%s', exiting.\n",filename.c_str());
  89                 log(DEFAULT,"Failed to write PID-file '%s', exiting.",filename.c_str());
  90                 Exit(0);
  91         }
  92 }
  93
  94
  95 int DaemonSeed (void)
  96 {
  97         int childpid;
  98         signal (SIGALRM, SIG_IGN);
  99         signal (SIGHUP, Rehash);
 100         signal (SIGPIPE, SIG_IGN);
 101         signal (SIGTERM, Exit);
 102         signal (SIGSEGV, Error);
 103         if ((childpid = fork ()) < 0)
 104                 return (ERROR);
 105         else if (childpid > 0)
 106                 exit (0);
 107         setsid ();
 108         umask (007);
 109         printf("InspIRCd Process ID: \033[1;32m%lu\033[0m\n",(unsigned long)getpid());
 110         freopen("/dev/null","w",stdout);
 111         freopen("/dev/null","w",stderr);
 112
 113         setpriority(PRIO_PROCESS,(int)getpid(),15);
 114
 115         if (unlimitcore)
 116         {
 117                 rlimit rl;
 118                 if (getrlimit(RLIMIT_CORE, &rl) == -1)
 119                 {
 120                         log(DEFAULT,"Failed to getrlimit()!");
 121                         return(FALSE);
 122                 }
 123                 else
 124                 {
 125                         rl.rlim_cur = rl.rlim_max;
 126                         if (setrlimit(RLIMIT_CORE, &rl) == -1)
 127                                 log(DEFAULT,"setrlimit() failed, cannot increase coredump size.");
 128                 }
 129         }
 130
 131         return (TRUE);
 132 }
 133
 134
 135 /* Make Sure Modules Are Avaliable!
 136  * (BugFix By Craig.. See? I do work! :p)
 137  * Modified by brain, requires const char*
 138  * to work with other API functions
 139  */
 140
 141 bool FileExists (const char* file)
 142 {
 143         FILE *input;
 144         if ((input = fopen (file, "r")) == NULL)
 145         {
 146                 return(false);
 147         }
 148         else
 149         {
 150                 fclose (input);
 151                 return(true);
 152         }
 153 }
 154
 155 /* ConfProcess does the following things to a config line in the following order:
 156  *
 157  * Processes the line for syntax errors as shown below
 158  *      (1) Line void of quotes or equals (a malformed, illegal tag format)
 159  *      (2) Odd number of quotes on the line indicating a missing quote
 160  *      (3) number of equals signs not equal to number of quotes / 2 (missing an equals sign)
 161  *      (4) Spaces between the opening bracket (<) and the keyword
 162  *      (5) Spaces between a keyword and an equals sign
 163  *      (6) Spaces between an equals sign and a quote
 164  * Removes trailing spaces
 165  * Removes leading spaces
 166  * Converts tabs to spaces
 167  * Turns multiple spaces that are outside of quotes into single spaces
 168  */
 169
 170 std::string ConfProcess(char* buffer, long linenumber, std::stringstream* errorstream, bool &error, std::string filename)
 171 {
 172         long number_of_quotes = 0;
 173         long number_of_equals = 0;
 174         bool has_open_bracket = false;
 175         bool in_quotes = false;
 176         error = false;
 177         if (!buffer)
 178         {
 179                 return "";
 180         }
 181         // firstly clean up the line by stripping spaces from the start and end and converting tabs to spaces
 182         for (int d = 0; d < strlen(buffer); d++)
 183                 if ((buffer[d]) == 9)
 184                         buffer[d] = ' ';
 185         while ((buffer[0] == ' ') && (strlen(buffer)>0)) buffer++;
 186         while ((buffer[strlen(buffer)-1] == ' ') && (strlen(buffer)>0)) buffer[strlen(buffer)-1] = '\0';
 187         // empty lines are syntactically valid
 188         if (!strcmp(buffer,""))
 189                 return "";
 190         else if (buffer[0] == '#')
 191                 return "";
 192         for (int c = 0; c < strlen(buffer); c++)
 193         {
 194                 // convert all spaces that are OUTSIDE quotes into hardspace (0xA0) as this will make them easier to
 195                 // search and replace later :)
 196                 if ((!in_quotes) && (buffer[c] == ' '))
 197                         buffer[c] = '\xA0';
 198                 if ((buffer[c] == '<') && (!in_quotes))
 199                 {
 200                         has_open_bracket = true;
 201                         if (strlen(buffer) == 1)
 202                         {
 203                                 *errorstream << "Tag without identifier at " << filename << ":" << linenumber << endl;
 204                                 error = true;
 205                                 return "";
 206                         }
 207                         else if ((tolower(buffer[c+1]) < 'a') || (tolower(buffer[c+1]) > 'z'))
 208                         {
 209                                 *errorstream << "Invalid characters in identifier at " << filename << ":" << linenumber << endl;
 210                                 error = true;
 211                                 return "";
 212                         }
 213                 }
 214                 if (buffer[c] == '"')
 215                 {
 216                         number_of_quotes++;
 217                         in_quotes = (!in_quotes);
 218                 }
 219                 if ((buffer[c] == '=') && (!in_quotes))
 220                 {
 221                         number_of_equals++;
 222                         if (strlen(buffer) == c)
 223                         {
 224                                 *errorstream << "Variable without a value at " << filename << ":" << linenumber << endl;
 225                                 error = true;
 226                                 return "";
 227                         }
 228                         else if (buffer[c+1] != '"')
 229                         {
 230                                 *errorstream << "Variable name not followed immediately by its value at " << filename << ":" << linenumber << endl;
 231                                 error = true;
 232                                 return "";
 233                         }
 234                         else if (!c)
 235                         {
 236                                 *errorstream << "Value without a variable (line starts with '=') at " << filename << ":" << linenumber << endl;
 237                                 error = true;
 238                                 return "";
 239                         }
 240                         else if (buffer[c-1] == '\xA0')
 241                         {
 242                                 *errorstream << "Variable name not followed immediately by its value at " << filename << ":" << linenumber << endl;
 243                                 error = true;
 244                                 return "";
 245                         }
 246                 }
 247         }
 248         // no quotes, and no equals. something freaky.
 249         if ((!number_of_quotes) || (!number_of_equals) && (strlen(buffer)>2) && (buffer[0]=='<'))
 250         {
 251                 *errorstream << "Malformed tag at " << filename << ":" << linenumber << endl;
 252                 error = true;
 253                 return "";
 254         }
 255         // odd number of quotes. thats just wrong.
 256         if ((number_of_quotes % 2) != 0)
 257         {
 258                 *errorstream << "Missing \" at " << filename << ":" << linenumber << endl;
 259                 error = true;
 260                 return "";
 261         }
 262         if (number_of_equals < (number_of_quotes/2))
 263         {
 264                 *errorstream << "Missing '=' at " << filename << ":" << linenumber << endl;
 265         }
 266         if (number_of_equals > (number_of_quotes/2))
 267         {
 268                 *errorstream << "Too many '=' at " << filename << ":" << linenumber << endl;
 269         }
 270
 271         std::string parsedata = buffer;
 272         // turn multispace into single space
 273         while (parsedata.find("\xA0\xA0") != std::string::npos)
 274         {
 275                 parsedata.erase(parsedata.find("\xA0\xA0"),1);
 276         }
 277
 278         // turn our hardspace back into softspace
 279         for (int d = 0; d < parsedata.length(); d++)
 280         {
 281                 if (parsedata[d] == '\xA0')
 282                         parsedata[d] = ' ';
 283         }
 284
 285         // and we're done, the line is fine!
 286         return parsedata;
 287 }
 288
 289 bool LoadConf(const char* filename, std::stringstream *target, std::stringstream* errorstream)
 290 {
 291         target->str("");
 292         errorstream->str("");
 293         long linenumber = 1;
 294         // first, check that the file exists before we try to do anything with it
 295         if (!FileExists(filename))
 296         {
 297                 *errorstream << "File " << filename << " not found." << endl;
 298                 return false;
 299         }
 300         // Fix the chmod of the file to restrict it to the current user and group
 301         chmod(filename,0600);
 302         for (int t = 0; t < include_stack.size(); t++)
 303         {
 304                 if (std::string(filename) == include_stack[t])
 305                 {
 306                         *errorstream << "File " << filename << " is included recursively (looped inclusion)." << endl;
 307                         return false;
 308                 }
 309         }
 310         include_stack.push_back(filename);
 311         // now open it
 312         FILE* conf = fopen(filename,"r");
 313         char buffer[MAXBUF];
 314         if (conf)
 315         {
 316                 while (!feof(conf))
 317                 {
 318                         if (fgets(buffer, MAXBUF, conf))
 319                         {
 320                                 if ((!feof(conf)) && (buffer) && (strlen(buffer)))
 321                                 {
 322                                         if ((buffer[0] != '#') && (buffer[0] != '\r')  && (buffer[0] != '\n'))
 323                                         {
 324                                                 if (!strncmp(buffer,"<include file=\"",15))
 325                                                 {
 326                                                         char* buf = buffer;
 327                                                         char confpath[10240],newconf[10240];
 328                                                         // include file directive
 329                                                         buf += 15;      // advance to filename
 330                                                         for (int j = 0; j < strlen(buffer); j++)
 331                                                         {
 332                                                                 if (buf[j] == '"')
 333                                                                 {
 334                                                                         buf[j] = '\0';
 335                                                                         break;
 336                                                                 }
 337                                                         }
 338                                                         log(DEFAULT,"Opening included file '%s'",buf);
 339                                                         if (*buf != '/')
 340                                                         {
 341                                                                 strlcpy(confpath,CONFIG_FILE,10240);
 342                                                                 if (strstr(confpath,"/inspircd.conf"))
 343                                                                 {
 344                                                                         // leaves us with just the path
 345                                                                         *(strstr(confpath,"/inspircd.conf")) = '\0';
 346                                                                 }
 347                                                                 snprintf(newconf,10240,"%s/%s",confpath,buf);
 348                                                         }
 349                                                         else snprintf(newconf,10240,"%s",buf);
 350                                                         std::stringstream merge(stringstream::in | stringstream::out);
 351                                                         // recursively call LoadConf and get the new data, use the same errorstream
 352                                                         if (LoadConf(newconf, &merge, errorstream))
 353                                                         {
 354                                                                 // append to the end of the file
 355                                                                 std::string newstuff = merge.str();
 356                                                                 *target << newstuff;
 357                                                         }
 358                                                         else
 359                                                         {
 360                                                                 // the error propogates up to its parent recursively
 361                                                                 // causing the config reader to bail at the top level.
 362                                                                 fclose(conf);
 363                                                                 return false;
 364                                                         }
 365                                                 }
 366                                                 else
 367                                                 {
 368                                                         bool error = false;
 369                                                         std::string data = ConfProcess(buffer,linenumber++,errorstream,error,filename);
 370                                                         if (error)
 371                                                         {
 372                                                                 return false;
 373                                                         }
 374                                                         *target << data;
 375                                                 }
 376                                         }
 377                                         else linenumber++;
 378                                 }
 379                         }
 380                 }
 381                 fclose(conf);
 382         }
 383         target->seekg(0);
 384         return true;
 385 }
 386
 387 /* Counts the number of tags of a certain type within the config file, e.g. to enumerate opers */
 388
 389 int EnumConf(std::stringstream *config, const char* tag)
 390 {
 391         int ptr = 0;
 392         char buffer[MAXBUF], c_tag[MAXBUF], c, lastc;
 393         int in_token, in_quotes, tptr, idx = 0;
 394
 395         const char* buf = config->str().c_str();
 396         long bptr = 0;
 397         long len = strlen(buf);
 398
 399         ptr = 0;
 400         in_token = 0;
 401         in_quotes = 0;
 402         lastc = '\0';
 403         while (bptr<len)
 404         {
 405                 lastc = c;
 406                 c = buf[bptr++];
 407                 if ((c == '#') && (lastc == '\n'))
 408                 {
 409                         while ((c != '\n') && (bptr<len))
 410                         {
 411                                 lastc = c;
 412                                 c = buf[bptr++];
 413                         }
 414                 }
 415                 if ((c == '<') && (!in_quotes))
 416                 {
 417                         tptr = 0;
 418                         in_token = 1;
 419                         do {
 420                                 c = buf[bptr++];
 421                                 if (c != ' ')
 422                                 {
 423                                         c_tag[tptr++] = c;
 424                                         c_tag[tptr] = '\0';
 425                                 }
 426                         } while (c != ' ');
 427                 }
 428                 if (c == '"')
 429                 {
 430                         in_quotes = (!in_quotes);
 431                 }
 432                 if ((c == '>') && (!in_quotes))
 433                 {
 434                         in_token = 0;
 435                         if (!strcmp(c_tag,tag))
 436                         {
 437                                 /* correct tag, but wrong index */
 438                                 idx++;
 439                         }
 440                         c_tag[0] = '\0';
 441                         buffer[0] = '\0';
 442                         ptr = 0;
 443                         tptr = 0;
 444                 }
 445                 if (c != '>')
 446                 {
 447                         if ((in_token) && (c != '\n') && (c != '\r'))
 448                         {
 449                                 buffer[ptr++] = c;
 450                                 buffer[ptr] = '\0';
 451                         }
 452                 }
 453         }
 454         return idx;
 455 }
 456
 457 /* Counts the number of values within a certain tag */
 458
 459 int EnumValues(std::stringstream *config, const char* tag, int index)
 460 {
 461         int ptr = 0;
 462         char buffer[MAXBUF], c_tag[MAXBUF], c, lastc;
 463         int in_token, in_quotes, tptr, idx = 0;
 464
 465         bool correct_tag = false;
 466         int num_items = 0;
 467
 468         const char* buf = config->str().c_str();
 469         long bptr = 0;
 470         long len = strlen(buf);
 471
 472         ptr = 0;
 473         in_token = 0;
 474         in_quotes = 0;
 475         lastc = '\0';
 476         while (bptr<len)
 477         {
 478                 lastc = c;
 479                 c = buf[bptr++];
 480                 if ((c == '#') && (lastc == '\n'))
 481                 {
 482                         while ((c != '\n') && (bptr<len))
 483                         {
 484                                 lastc = c;
 485                                 c = buf[bptr++];
 486                         }
 487                 }
 488                 if ((c == '<') && (!in_quotes))
 489                 {
 490                         tptr = 0;
 491                         in_token = 1;
 492                         do {
 493                                 c = buf[bptr++];
 494                                 if (c != ' ')
 495                                 {
 496                                         c_tag[tptr++] = c;
 497                                         c_tag[tptr] = '\0';
 498
 499                                         if ((!strcmp(c_tag,tag)) && (idx == index))
 500                                         {
 501                                                 correct_tag = true;
 502                                         }
 503                                 }
 504                         } while (c != ' ');
 505                 }
 506                 if (c == '"')
 507                 {
 508                         in_quotes = (!in_quotes);
 509                 }
 510
 511                 if ( (correct_tag) && (!in_quotes) && ( (c == ' ') || (c == '\n') || (c == '\r') ) )
 512                 {
 513                         num_items++;
 514                 }
 515                 if ((c == '>') && (!in_quotes))
 516                 {
 517                         in_token = 0;
 518                         if (correct_tag)
 519                                 correct_tag = false;
 520                         if (!strcmp(c_tag,tag))
 521                         {
 522                                 /* correct tag, but wrong index */
 523                                 idx++;
 524                         }
 525                         c_tag[0] = '\0';
 526                         buffer[0] = '\0';
 527                         ptr = 0;
 528                         tptr = 0;
 529                 }
 530                 if (c != '>')
 531                 {
 532                         if ((in_token) && (c != '\n') && (c != '\r'))
 533                         {
 534                                 buffer[ptr++] = c;
 535                                 buffer[ptr] = '\0';
 536                         }
 537                 }
 538         }
 539         return num_items+1;
 540 }
 541
 542
 543
 544 int ConfValueEnum(char* tag, std::stringstream* config)
 545 {
 546         return EnumConf(config,tag);
 547 }
 548
 549
 550
 551 /* Retrieves a value from the config file. If there is more than one value of the specified
 552  * key and section (e.g. for opers etc) then the index value specifies which to retreive, e.g.
 553  *
 554  * ConfValue("oper","name",2,result);
 555  */
 556
 557 int ReadConf(std::stringstream *config, const char* tag, const char* var, int index, char *result)
 558 {
 559         int ptr = 0;
 560         char buffer[65535], c_tag[MAXBUF], c, lastc;
 561         int in_token, in_quotes, tptr, j, idx = 0;
 562         char* key;
 563
 564         const char* buf = config->str().c_str();
 565         long bptr = 0;
 566         long len = config->str().length();
 567
 568         ptr = 0;
 569         in_token = 0;
 570         in_quotes = 0;
 571         lastc = '\0';
 572         c_tag[0] = '\0';
 573         buffer[0] = '\0';
 574         while (bptr<len)
 575         {
 576                 lastc = c;
 577                 c = buf[bptr++];
 578                 // FIX: Treat tabs as spaces
 579                 if (c == 9)
 580                         c = 32;
 581                 if ((c == '<') && (!in_quotes))
 582                 {
 583                         tptr = 0;
 584                         in_token = 1;
 585                         do {
 586                                 c = buf[bptr++];
 587                                 if (c != ' ')
 588                                 {
 589                                         c_tag[tptr++] = c;
 590                                         c_tag[tptr] = '\0';
 591                                 }
 592                         // FIX: Tab can follow a tagname as well as space.
 593                         } while ((c != ' ') && (c != 9));
 594                 }
 595                 if (c == '"')
 596                 {
 597                         in_quotes = (!in_quotes);
 598                 }
 599                 if ((c == '>') && (!in_quotes))
 600                 {
 601                         in_token = 0;
 602                         if (idx == index)
 603                         {
 604                                 if (!strcmp(c_tag,tag))
 605                                 {
 606                                         if ((buffer) && (c_tag) && (var))
 607                                         {
 608                                                 key = strstr(buffer,var);
 609                                                 if (!key)
 610                                                 {
 611                                                         /* value not found in tag */
 612                                                         strcpy(result,"");
 613                                                         return 0;
 614                                                 }
 615                                                 else
 616                                                 {
 617                                                         key+=strlen(var);
 618                                                         while (key[0] !='"')
 619                                                         {
 620                                                                 if (!strlen(key))
 621                                                                 {
 622                                                                         /* missing quote */
 623                                                                         strcpy(result,"");
 624                                                                         return 0;
 625                                                                 }
 626                                                                 key++;
 627                                                         }
 628                                                         key++;
 629                                                         for (j = 0; j < strlen(key); j++)
 630                                                         {
 631                                                                 if (key[j] == '"')
 632                                                                 {
 633                                                                         key[j] = '\0';
 634                                                                 }
 635                                                         }
 636                                                         strlcpy(result,key,MAXBUF);
 637                                                         return 1;
 638                                                 }
 639                                         }
 640                                 }
 641                         }
 642                         if (!strcmp(c_tag,tag))
 643                         {
 644                                 /* correct tag, but wrong index */
 645                                 idx++;
 646                         }
 647                         c_tag[0] = '\0';
 648                         buffer[0] = '\0';
 649                         ptr = 0;
 650                         tptr = 0;
 651                 }
 652                 if (c != '>')
 653                 {
 654                         if ((in_token) && (c != '\n') && (c != '\r'))
 655                         {
 656                                 buffer[ptr++] = c;
 657                                 buffer[ptr] = '\0';
 658                         }
 659                 }
 660         }
 661         strcpy(result,""); // value or its tag not found at all
 662         return 0;
 663 }
 664
 665
 666
 667 int ConfValue(char* tag, char* var, int index, char *result,std::stringstream *config)
 668 {
 669         ReadConf(config, tag, var, index, result);
 670         return 0;
 671 }
 672
 673
 674
 675 // This will bind a socket to a port. It works for UDP/TCP
 676 int BindSocket (int sockfd, struct sockaddr_in client, struct sockaddr_in server, int port, char* addr)
 677 {
 678         memset((char *)&server,0,sizeof(server));
 679         struct in_addr addy;
 680         inet_aton(addr,&addy);
 681         server.sin_family = AF_INET;
 682         if (!strcmp(addr,""))
 683         {
 684                 server.sin_addr.s_addr = htonl(INADDR_ANY);
 685         }
 686         else
 687         {
 688                 server.sin_addr = addy;
 689         }
 690         server.sin_port = htons(port);
 691         if (bind(sockfd,(struct sockaddr*)&server,sizeof(server))<0)
 692         {
 693                 return(ERROR);
 694         }
 695         else
 696         {
 697                 listen(sockfd, MaxConn);
 698                 return(TRUE);
 699         }
 700 }
 701
 702
 703 // Open a TCP Socket
 704 int OpenTCPSocket (void)
 705 {
 706         int sockfd;
 707         int on = 1;
 708         struct linger linger = { 0 };
 709
 710         if ((sockfd = socket (AF_INET, SOCK_STREAM, 0)) < 0)
 711                 return (ERROR);
 712         else
 713         {
 714                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (const char*)&on, sizeof(on));
 715                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
 716                 linger.l_onoff = 1;
 717                 linger.l_linger = 1;
 718                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, (const char*)&linger,sizeof(linger));
 719                 return (sockfd);
 720         }
 721 }
 722