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 #include <sys/time.h>
  18 #include <sys/resource.h>
  19 #include <sys/types.h>
  20 #include <string>
  21 #include <unistd.h>
  22 #include <sstream>
  23 #include <iostream>
  24 #include <fstream>
  25 #include "inspircd.h"
  26 #include "inspircd_io.h"
  27 #include "inspircd_util.h"
  28 #include "inspstring.h"
  29
  30 using namespace std;
  31
  32 extern FILE *log_file;
  33 extern int boundPortCount;
  34 extern int openSockfd[MAXSOCKS];
  35 extern time_t TIME;
  36 extern bool unlimitcore;
  37
  38 void WriteOpers(char* text, ...);
  39
  40 void Exit (int status)
  41 {
  42         if (log_file)
  43                 fclose(log_file);
  44         send_error("Server shutdown.");
  45         exit (status);
  46 }
  47
  48 void Killed(int status)
  49 {
  50         if (log_file)
  51                 fclose(log_file);
  52         send_error("Server terminated.");
  53         exit(status);
  54 }
  55
  56 void Rehash(int status)
  57 {
  58         WriteOpers("Rehashing config file %s due to SIGHUP",CONFIG_FILE);
  59         ReadConfig(false,NULL);
  60 }
  61
  62
  63
  64 void Start (void)
  65 {
  66         printf("\033[1;32mInspire Internet Relay Chat Server, compiled %s at %s\n",__DATE__,__TIME__);
  67         printf("(C) ChatSpike Development team.\033[0m\n\n");
  68         printf("Developers:\033[1;32m     Brain, FrostyCoolSlug\033[0m\n");
  69         printf("Documentation:\033[1;32m  FrostyCoolSlug, w00t\033[0m\n");
  70         printf("Testers:\033[1;32m        typobox43, piggles, Lord_Zathras, CC\033[0m\n");
  71         printf("Name concept:\033[1;32m   Lord_Zathras\033[0m\n\n");
  72 }
  73
  74 void WritePID(std::string filename)
  75 {
  76         ofstream outfile(filename.c_str());
  77         if (outfile.is_open())
  78         {
  79                 outfile << getpid();
  80                 outfile.close();
  81         }
  82         else
  83         {
  84                 printf("Failed to write PID-file '%s', exiting.\n",filename.c_str());
  85                 log(DEFAULT,"Failed to write PID-file '%s', exiting.",filename.c_str());
  86                 Exit(0);
  87         }
  88 }
  89
  90 void DeadPipe(int status)
  91 {
  92   signal (SIGPIPE, DeadPipe);
  93 }
  94
  95 int DaemonSeed (void)
  96 {
  97         int childpid;
  98         signal (SIGALRM, SIG_IGN);
  99         signal (SIGHUP, Rehash);
 100         signal (SIGPIPE, DeadPipe);
 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         // now open it
 303         FILE* conf = fopen(filename,"r");
 304         char buffer[MAXBUF];
 305         if (conf)
 306         {
 307                 while (!feof(conf))
 308                 {
 309                         if (fgets(buffer, MAXBUF, conf))
 310                         {
 311                                 if ((!feof(conf)) && (buffer) && (strlen(buffer)))
 312                                 {
 313                                         if ((buffer[0] != '#') && (buffer[0] != '\r')  && (buffer[0] != '\n'))
 314                                         {
 315                                                 bool error = false;
 316                                                 std::string data = ConfProcess(buffer,linenumber++,errorstream,error,filename);
 317                                                 if (error)
 318                                                 {
 319                                                         return false;
 320                                                 }
 321                                                 *target << data;
 322                                         }
 323                                         else linenumber++;
 324                                 }
 325                         }
 326                 }
 327                 fclose(conf);
 328         }
 329         target->seekg(0);
 330         return true;
 331 }
 332
 333 /* Counts the number of tags of a certain type within the config file, e.g. to enumerate opers */
 334
 335 int EnumConf(std::stringstream *config, const char* tag)
 336 {
 337         int ptr = 0;
 338         char buffer[MAXBUF], c_tag[MAXBUF], c, lastc;
 339         int in_token, in_quotes, tptr, idx = 0;
 340
 341         const char* buf = config->str().c_str();
 342         long bptr = 0;
 343         long len = strlen(buf);
 344
 345         ptr = 0;
 346         in_token = 0;
 347         in_quotes = 0;
 348         lastc = '\0';
 349         while (bptr<len)
 350         {
 351                 lastc = c;
 352                 c = buf[bptr++];
 353                 if ((c == '#') && (lastc == '\n'))
 354                 {
 355                         while ((c != '\n') && (bptr<len))
 356                         {
 357                                 lastc = c;
 358                                 c = buf[bptr++];
 359                         }
 360                 }
 361                 if ((c == '<') && (!in_quotes))
 362                 {
 363                         tptr = 0;
 364                         in_token = 1;
 365                         do {
 366                                 c = buf[bptr++];
 367                                 if (c != ' ')
 368                                 {
 369                                         c_tag[tptr++] = c;
 370                                         c_tag[tptr] = '\0';
 371                                 }
 372                         } while (c != ' ');
 373                 }
 374                 if (c == '"')
 375                 {
 376                         in_quotes = (!in_quotes);
 377                 }
 378                 if ((c == '>') && (!in_quotes))
 379                 {
 380                         in_token = 0;
 381                         if (!strcmp(c_tag,tag))
 382                         {
 383                                 /* correct tag, but wrong index */
 384                                 idx++;
 385                         }
 386                         c_tag[0] = '\0';
 387                         buffer[0] = '\0';
 388                         ptr = 0;
 389                         tptr = 0;
 390                 }
 391                 if (c != '>')
 392                 {
 393                         if ((in_token) && (c != '\n') && (c != '\r'))
 394                         {
 395                                 buffer[ptr++] = c;
 396                                 buffer[ptr] = '\0';
 397                         }
 398                 }
 399         }
 400         return idx;
 401 }
 402
 403 /* Counts the number of values within a certain tag */
 404
 405 int EnumValues(std::stringstream *config, const char* tag, int index)
 406 {
 407         int ptr = 0;
 408         char buffer[MAXBUF], c_tag[MAXBUF], c, lastc;
 409         int in_token, in_quotes, tptr, idx = 0;
 410
 411         bool correct_tag = false;
 412         int num_items = 0;
 413
 414         const char* buf = config->str().c_str();
 415         long bptr = 0;
 416         long len = strlen(buf);
 417
 418         ptr = 0;
 419         in_token = 0;
 420         in_quotes = 0;
 421         lastc = '\0';
 422         while (bptr<len)
 423         {
 424                 lastc = c;
 425                 c = buf[bptr++];
 426                 if ((c == '#') && (lastc == '\n'))
 427                 {
 428                         while ((c != '\n') && (bptr<len))
 429                         {
 430                                 lastc = c;
 431                                 c = buf[bptr++];
 432                         }
 433                 }
 434                 if ((c == '<') && (!in_quotes))
 435                 {
 436                         tptr = 0;
 437                         in_token = 1;
 438                         do {
 439                                 c = buf[bptr++];
 440                                 if (c != ' ')
 441                                 {
 442                                         c_tag[tptr++] = c;
 443                                         c_tag[tptr] = '\0';
 444
 445                                         if ((!strcmp(c_tag,tag)) && (idx == index))
 446                                         {
 447                                                 correct_tag = true;
 448                                         }
 449                                 }
 450                         } while (c != ' ');
 451                 }
 452                 if (c == '"')
 453                 {
 454                         in_quotes = (!in_quotes);
 455                 }
 456
 457                 if ( (correct_tag) && (!in_quotes) && ( (c == ' ') || (c == '\n') || (c == '\r') ) )
 458                 {
 459                         num_items++;
 460                 }
 461                 if ((c == '>') && (!in_quotes))
 462                 {
 463                         in_token = 0;
 464                         if (correct_tag)
 465                                 correct_tag = false;
 466                         if (!strcmp(c_tag,tag))
 467                         {
 468                                 /* correct tag, but wrong index */
 469                                 idx++;
 470                         }
 471                         c_tag[0] = '\0';
 472                         buffer[0] = '\0';
 473                         ptr = 0;
 474                         tptr = 0;
 475                 }
 476                 if (c != '>')
 477                 {
 478                         if ((in_token) && (c != '\n') && (c != '\r'))
 479                         {
 480                                 buffer[ptr++] = c;
 481                                 buffer[ptr] = '\0';
 482                         }
 483                 }
 484         }
 485         return num_items+1;
 486 }
 487
 488
 489
 490 int ConfValueEnum(char* tag, std::stringstream* config)
 491 {
 492         return EnumConf(config,tag);
 493 }
 494
 495
 496
 497 /* Retrieves a value from the config file. If there is more than one value of the specified
 498  * key and section (e.g. for opers etc) then the index value specifies which to retreive, e.g.
 499  *
 500  * ConfValue("oper","name",2,result);
 501  */
 502
 503 int ReadConf(std::stringstream *config, const char* tag, const char* var, int index, char *result)
 504 {
 505         int ptr = 0;
 506         char buffer[65535], c_tag[MAXBUF], c, lastc;
 507         int in_token, in_quotes, tptr, j, idx = 0;
 508         char* key;
 509
 510         const char* buf = config->str().c_str();
 511         long bptr = 0;
 512         long len = config->str().length();
 513
 514         ptr = 0;
 515         in_token = 0;
 516         in_quotes = 0;
 517         lastc = '\0';
 518         c_tag[0] = '\0';
 519         buffer[0] = '\0';
 520         while (bptr<len)
 521         {
 522                 lastc = c;
 523                 c = buf[bptr++];
 524                 // FIX: Treat tabs as spaces
 525                 if (c == 9)
 526                         c = 32;
 527                 if ((c == '<') && (!in_quotes))
 528                 {
 529                         tptr = 0;
 530                         in_token = 1;
 531                         do {
 532                                 c = buf[bptr++];
 533                                 if (c != ' ')
 534                                 {
 535                                         c_tag[tptr++] = c;
 536                                         c_tag[tptr] = '\0';
 537                                 }
 538                         // FIX: Tab can follow a tagname as well as space.
 539                         } while ((c != ' ') && (c != 9));
 540                 }
 541                 if (c == '"')
 542                 {
 543                         in_quotes = (!in_quotes);
 544                 }
 545                 if ((c == '>') && (!in_quotes))
 546                 {
 547                         in_token = 0;
 548                         if (idx == index)
 549                         {
 550                                 if (!strcmp(c_tag,tag))
 551                                 {
 552                                         if ((buffer) && (c_tag) && (var))
 553                                         {
 554                                                 key = strstr(buffer,var);
 555                                                 if (!key)
 556                                                 {
 557                                                         /* value not found in tag */
 558                                                         strcpy(result,"");
 559                                                         return 0;
 560                                                 }
 561                                                 else
 562                                                 {
 563                                                         key+=strlen(var);
 564                                                         while (key[0] !='"')
 565                                                         {
 566                                                                 if (!strlen(key))
 567                                                                 {
 568                                                                         /* missing quote */
 569                                                                         strcpy(result,"");
 570                                                                         return 0;
 571                                                                 }
 572                                                                 key++;
 573                                                         }
 574                                                         key++;
 575                                                         for (j = 0; j < strlen(key); j++)
 576                                                         {
 577                                                                 if (key[j] == '"')
 578                                                                 {
 579                                                                         key[j] = '\0';
 580                                                                 }
 581                                                         }
 582                                                         strlcpy(result,key,MAXBUF);
 583                                                         return 1;
 584                                                 }
 585                                         }
 586                                 }
 587                         }
 588                         if (!strcmp(c_tag,tag))
 589                         {
 590                                 /* correct tag, but wrong index */
 591                                 idx++;
 592                         }
 593                         c_tag[0] = '\0';
 594                         buffer[0] = '\0';
 595                         ptr = 0;
 596                         tptr = 0;
 597                 }
 598                 if (c != '>')
 599                 {
 600                         if ((in_token) && (c != '\n') && (c != '\r'))
 601                         {
 602                                 buffer[ptr++] = c;
 603                                 buffer[ptr] = '\0';
 604                         }
 605                 }
 606         }
 607         strcpy(result,""); // value or its tag not found at all
 608         return 0;
 609 }
 610
 611
 612
 613 int ConfValue(char* tag, char* var, int index, char *result,std::stringstream *config)
 614 {
 615         ReadConf(config, tag, var, index, result);
 616         return 0;
 617 }
 618
 619
 620
 621 // This will bind a socket to a port. It works for UDP/TCP
 622 int BindSocket (int sockfd, struct sockaddr_in client, struct sockaddr_in server, int port, char* addr)
 623 {
 624         bzero((char *)&server,sizeof(server));
 625         struct in_addr addy;
 626         inet_aton(addr,&addy);
 627         server.sin_family = AF_INET;
 628         if (!strcmp(addr,""))
 629         {
 630                 server.sin_addr.s_addr = htonl(INADDR_ANY);
 631         }
 632         else
 633         {
 634                 server.sin_addr = addy;
 635         }
 636         server.sin_port = htons(port);
 637         if (bind(sockfd,(struct sockaddr*)&server,sizeof(server))<0)
 638         {
 639                 return(ERROR);
 640         }
 641         else
 642         {
 643                 listen(sockfd,5);
 644                 return(TRUE);
 645         }
 646 }
 647
 648
 649 // Open a TCP Socket
 650 int OpenTCPSocket (void)
 651 {
 652         int sockfd;
 653         int on = 1;
 654         struct linger linger = { 0 };
 655
 656         if ((sockfd = socket (AF_INET, SOCK_STREAM, 0)) < 0)
 657                 return (ERROR);
 658         else
 659         {
 660                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (const char*)&on, sizeof(on));
 661                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
 662                 linger.l_onoff = 1;
 663                 linger.l_linger = 1;
 664                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, (const char*)&linger,sizeof(linger));
 665                 return (sockfd);
 666         }
 667 }
 668