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
  37 void WriteOpers(char* text, ...);
  38
  39 void Exit (int status)
  40 {
  41         if (log_file)
  42                 fclose(log_file);
  43         send_error("Server shutdown.");
  44
  45         // close down all listening sockets
  46         for (int count = 0; count < boundPortCount; count++)
  47         {
  48                 shutdown(openSockfd[count], 2);
  49         }
  50
  51         exit (status);
  52 }
  53
  54 void Killed(int status)
  55 {
  56         if (log_file)
  57                 fclose(log_file);
  58         send_error("Server terminated.");
  59         // close down all listening sockets
  60         for (int count = 0; count < boundPortCount; count++)
  61         {
  62                 shutdown(openSockfd[count], 2);
  63         }
  64         exit(status);
  65 }
  66
  67 void Rehash(int status)
  68 {
  69         WriteOpers("Rehashing config file %s due to SIGHUP",CONFIG_FILE);
  70         ReadConfig(false,NULL);
  71 }
  72
  73
  74
  75 void Start (void)
  76 {
  77         printf("\033[1;37mInspire Internet Relay Chat Server, compiled " __DATE__ " at " __TIME__ "\n");
  78         printf("(C) ChatSpike Development team.\033[0;37m\n\n");
  79         printf("\033[1;37mDevelopers:\033[0;37m     Brain, FrostyCoolSlug\n");
  80         printf("\033[1;37mDocumentation:\033[0;37m  FrostyCoolSlug, w00t\n");
  81         printf("\033[1;37mTesters:\033[0;37m        typobox43, piggles, Lord_Zathras, CC\n");
  82         printf("\033[1;37mName concept:\033[0;37m   Lord_Zathras\n\n");
  83 }
  84
  85 void WritePID(std::string filename)
  86 {
  87         ofstream outfile(filename.c_str());
  88         if (outfile.is_open())
  89         {
  90                 outfile << getpid();
  91                 outfile.close();
  92         }
  93         else
  94         {
  95                 printf("Failed to write PID-file '%s', exiting.\n",filename.c_str());
  96                 log(DEFAULT,"Failed to write PID-file '%s', exiting.",filename.c_str());
  97                 Exit(0);
  98         }
  99 }
 100
 101 void DeadPipe(int status)
 102 {
 103   signal (SIGPIPE, DeadPipe);
 104 }
 105
 106 int DaemonSeed (void)
 107 {
 108         int childpid;
 109         signal (SIGALRM, SIG_IGN);
 110         signal (SIGHUP, Rehash);
 111         signal (SIGPIPE, DeadPipe);
 112         signal (SIGTERM, Exit);
 113         signal (SIGABRT, Exit);
 114         signal (SIGSEGV, Error);
 115         signal (SIGURG, Exit);
 116         signal (SIGKILL, Exit);
 117         if ((childpid = fork ()) < 0)
 118                 return (ERROR);
 119         else if (childpid > 0)
 120                 exit (0);
 121         setsid ();
 122         umask (007);
 123         /* close stdout, stdin, stderr */
 124         close(0);
 125         close(1);
 126         close(2);
 127
 128         setpriority(PRIO_PROCESS,(int)getpid(),15); /* ircd sets to low process priority so it doesnt hog the box */
 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, j, idx = 0;
 339         char* key;
 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, j, idx = 0;
 410         char* key;
 411
 412         bool correct_tag = false;
 413         int num_items = 0;
 414
 415         const char* buf = config->str().c_str();
 416         long bptr = 0;
 417         long len = strlen(buf);
 418
 419         ptr = 0;
 420         in_token = 0;
 421         in_quotes = 0;
 422         lastc = '\0';
 423         while (bptr<len)
 424         {
 425                 lastc = c;
 426                 c = buf[bptr++];
 427                 if ((c == '#') && (lastc == '\n'))
 428                 {
 429                         while ((c != '\n') && (bptr<len))
 430                         {
 431                                 lastc = c;
 432                                 c = buf[bptr++];
 433                         }
 434                 }
 435                 if ((c == '<') && (!in_quotes))
 436                 {
 437                         tptr = 0;
 438                         in_token = 1;
 439                         do {
 440                                 c = buf[bptr++];
 441                                 if (c != ' ')
 442                                 {
 443                                         c_tag[tptr++] = c;
 444                                         c_tag[tptr] = '\0';
 445
 446                                         if ((!strcmp(c_tag,tag)) && (idx == index))
 447                                         {
 448                                                 correct_tag = true;
 449                                         }
 450                                 }
 451                         } while (c != ' ');
 452                 }
 453                 if (c == '"')
 454                 {
 455                         in_quotes = (!in_quotes);
 456                 }
 457
 458                 if ( (correct_tag) && (!in_quotes) && ( (c == ' ') || (c == '\n') || (c == '\r') ) )
 459                 {
 460                         num_items++;
 461                 }
 462                 if ((c == '>') && (!in_quotes))
 463                 {
 464                         in_token = 0;
 465                         if (correct_tag)
 466                                 correct_tag = false;
 467                         if (!strcmp(c_tag,tag))
 468                         {
 469                                 /* correct tag, but wrong index */
 470                                 idx++;
 471                         }
 472                         c_tag[0] = '\0';
 473                         buffer[0] = '\0';
 474                         ptr = 0;
 475                         tptr = 0;
 476                 }
 477                 if (c != '>')
 478                 {
 479                         if ((in_token) && (c != '\n') && (c != '\r'))
 480                         {
 481                                 buffer[ptr++] = c;
 482                                 buffer[ptr] = '\0';
 483                         }
 484                 }
 485         }
 486         return num_items+1;
 487 }
 488
 489
 490
 491 int ConfValueEnum(char* tag, std::stringstream* config)
 492 {
 493         return EnumConf(config,tag);
 494 }
 495
 496
 497
 498 /* Retrieves a value from the config file. If there is more than one value of the specified
 499  * key and section (e.g. for opers etc) then the index value specifies which to retreive, e.g.
 500  *
 501  * ConfValue("oper","name",2,result);
 502  */
 503
 504 int ReadConf(std::stringstream *config, const char* tag, const char* var, int index, char *result)
 505 {
 506         int ptr = 0;
 507         char buffer[65535], c_tag[MAXBUF], c, lastc;
 508         int in_token, in_quotes, tptr, j, idx = 0;
 509         char* key;
 510
 511         const char* buf = config->str().c_str();
 512         long bptr = 0;
 513         long len = strlen(buf);
 514
 515         ptr = 0;
 516         in_token = 0;
 517         in_quotes = 0;
 518         lastc = '\0';
 519         c_tag[0] = '\0';
 520         buffer[0] = '\0';
 521         while (bptr<len)
 522         {
 523                 lastc = c;
 524                 c = buf[bptr++];
 525                 // FIX: Treat tabs as spaces
 526                 if (c == 9)
 527                         c = 32;
 528                 if ((c == '<') && (!in_quotes))
 529                 {
 530                         tptr = 0;
 531                         in_token = 1;
 532                         do {
 533                                 c = buf[bptr++];
 534                                 if (c != ' ')
 535                                 {
 536                                         c_tag[tptr++] = c;
 537                                         c_tag[tptr] = '\0';
 538                                 }
 539                         // FIX: Tab can follow a tagname as well as space.
 540                         } while ((c != ' ') && (c != 9));
 541                 }
 542                 if (c == '"')
 543                 {
 544                         in_quotes = (!in_quotes);
 545                 }
 546                 if ((c == '>') && (!in_quotes))
 547                 {
 548                         in_token = 0;
 549                         if (idx == index)
 550                         {
 551                                 if (!strcmp(c_tag,tag))
 552                                 {
 553                                         if ((buffer) && (c_tag) && (var))
 554                                         {
 555                                                 key = strstr(buffer,var);
 556                                                 if (!key)
 557                                                 {
 558                                                         /* value not found in tag */
 559                                                         strcpy(result,"");
 560                                                         return 0;
 561                                                 }
 562                                                 else
 563                                                 {
 564                                                         key+=strlen(var);
 565                                                         while (key[0] !='"')
 566                                                         {
 567                                                                 if (!strlen(key))
 568                                                                 {
 569                                                                         /* missing quote */
 570                                                                         strcpy(result,"");
 571                                                                         return 0;
 572                                                                 }
 573                                                                 key++;
 574                                                         }
 575                                                         key++;
 576                                                         for (j = 0; j < strlen(key); j++)
 577                                                         {
 578                                                                 if (key[j] == '"')
 579                                                                 {
 580                                                                         key[j] = '\0';
 581                                                                 }
 582                                                         }
 583                                                         strlcpy(result,key,MAXBUF);
 584                                                         return 1;
 585                                                 }
 586                                         }
 587                                 }
 588                         }
 589                         if (!strcmp(c_tag,tag))
 590                         {
 591                                 /* correct tag, but wrong index */
 592                                 idx++;
 593                         }
 594                         c_tag[0] = '\0';
 595                         buffer[0] = '\0';
 596                         ptr = 0;
 597                         tptr = 0;
 598                 }
 599                 if (c != '>')
 600                 {
 601                         if ((in_token) && (c != '\n') && (c != '\r'))
 602                         {
 603                                 buffer[ptr++] = c;
 604                                 buffer[ptr] = '\0';
 605                         }
 606                 }
 607         }
 608         strcpy(result,""); // value or its tag not found at all
 609         return 0;
 610 }
 611
 612
 613
 614 int ConfValue(char* tag, char* var, int index, char *result,std::stringstream *config)
 615 {
 616         ReadConf(config, tag, var, index, result);
 617         return 0;
 618 }
 619
 620
 621
 622 // This will bind a socket to a port. It works for UDP/TCP
 623 int BindSocket (int sockfd, struct sockaddr_in client, struct sockaddr_in server, int port, char* addr)
 624 {
 625         bzero((char *)&server,sizeof(server));
 626         struct in_addr addy;
 627         inet_aton(addr,&addy);
 628         server.sin_family = AF_INET;
 629         if (!strcmp(addr,""))
 630         {
 631                 server.sin_addr.s_addr = htonl(INADDR_ANY);
 632         }
 633         else
 634         {
 635                 server.sin_addr = addy;
 636         }
 637         server.sin_port = htons(port);
 638         if (bind(sockfd,(struct sockaddr*)&server,sizeof(server))<0)
 639         {
 640                 return(ERROR);
 641         }
 642         else
 643         {
 644                 listen(sockfd,5);
 645                 return(TRUE);
 646         }
 647 }
 648
 649
 650 // Open a TCP Socket
 651 int OpenTCPSocket (void)
 652 {
 653         int sockfd;
 654         int on = 0;
 655         struct linger linger = { 0 };
 656
 657         if ((sockfd = socket (AF_INET, SOCK_STREAM, 0)) < 0)
 658                 return (ERROR);
 659         else
 660         {
 661                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (const char*)&on, sizeof(on));
 662                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
 663                 linger.l_onoff = 1;
 664                 linger.l_linger = 0;
 665                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, (const char*)&linger,sizeof(linger));
 666                 return (sockfd);
 667         }
 668 }
 669