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