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
  36 void WriteOpers(char* text, ...);
  37
  38 void Exit (int status)
  39 {
  40         if (log_file)
  41                 fclose(log_file);
  42         send_error("Server shutdown.");
  43
  44         // close down all listening sockets
  45         for (int count = 0; count < boundPortCount; count++)
  46         {
  47                 shutdown(openSockfd[count], 2);
  48         }
  49
  50         exit (status);
  51 }
  52
  53 void Killed(int status)
  54 {
  55         if (log_file)
  56                 fclose(log_file);
  57         send_error("Server terminated.");
  58         // close down all listening sockets
  59         for (int count = 0; count < boundPortCount; count++)
  60         {
  61                 shutdown(openSockfd[count], 2);
  62         }
  63         exit(status);
  64 }
  65
  66 void Rehash(int status)
  67 {
  68         WriteOpers("Rehashing config file %s due to SIGHUP",CONFIG_FILE);
  69         ReadConfig(false,NULL);
  70 }
  71
  72
  73
  74 void Start (void)
  75 {
  76         printf("\033[1;37mInspire Internet Relay Chat Server, compiled " __DATE__ " at " __TIME__ "\n");
  77         printf("(C) ChatSpike Development team.\033[0;37m\n\n");
  78         printf("\033[1;37mDevelopers:\033[0;37m     Brain, FrostyCoolSlug\n");
  79         printf("\033[1;37mDocumentation:\033[0;37m  FrostyCoolSlug, w00t\n");
  80         printf("\033[1;37mTesters:\033[0;37m        typobox43, piggles, Lord_Zathras, CC\n");
  81         printf("\033[1;37mName concept:\033[0;37m   Lord_Zathras\n\n");
  82 }
  83
  84 void WritePID(std::string filename)
  85 {
  86         ofstream outfile(filename.c_str());
  87         if (outfile.is_open())
  88         {
  89                 outfile << getpid();
  90                 outfile.close();
  91         }
  92         else
  93         {
  94                 printf("Failed to write PID-file '%s', exiting.\n",filename.c_str());
  95                 Exit(0);
  96         }
  97 }
  98
  99 void DeadPipe(int status)
 100 {
 101   signal (SIGPIPE, DeadPipe);
 102 }
 103
 104 int DaemonSeed (void)
 105 {
 106         int childpid;
 107         signal (SIGALRM, SIG_IGN);
 108         signal (SIGHUP, Rehash);
 109         signal (SIGPIPE, DeadPipe);
 110         signal (SIGTERM, Exit);
 111         signal (SIGABRT, Exit);
 112         signal (SIGSEGV, Error);
 113         signal (SIGURG, Exit);
 114         signal (SIGKILL, Exit);
 115         if ((childpid = fork ()) < 0)
 116                 return (ERROR);
 117         else if (childpid > 0)
 118                 exit (0);
 119         setsid ();
 120         umask (007);
 121         /* close stdout, stdin, stderr */
 122         close(0);
 123         close(1);
 124         close(2);
 125
 126         setpriority(PRIO_PROCESS,(int)getpid(),15); /* ircd sets to low process priority so it doesnt hog the box */
 127
 128         return (TRUE);
 129 }
 130
 131
 132 /* Make Sure Modules Are Avaliable!
 133  * (BugFix By Craig.. See? I do work! :p)
 134  * Modified by brain, requires const char*
 135  * to work with other API functions
 136  */
 137
 138 bool FileExists (const char* file)
 139 {
 140         FILE *input;
 141         if ((input = fopen (file, "r")) == NULL)
 142         {
 143                 return(false);
 144         }
 145         else
 146         {
 147                 fclose (input);
 148                 return(true);
 149         }
 150 }
 151
 152 /* ConfProcess does the following things to a config line in the following order:
 153  *
 154  * Processes the line for syntax errors as shown below
 155  *      (1) Line void of quotes or equals (a malformed, illegal tag format)
 156  *      (2) Odd number of quotes on the line indicating a missing quote
 157  *      (3) number of equals signs not equal to number of quotes / 2 (missing an equals sign)
 158  *      (4) Spaces between the opening bracket (<) and the keyword
 159  *      (5) Spaces between a keyword and an equals sign
 160  *      (6) Spaces between an equals sign and a quote
 161  * Removes trailing spaces
 162  * Removes leading spaces
 163  * Converts tabs to spaces
 164  * Turns multiple spaces that are outside of quotes into single spaces
 165  */
 166
 167 std::string ConfProcess(char* buffer, long linenumber, std::stringstream* errorstream, bool &error, std::string filename)
 168 {
 169         long number_of_quotes = 0;
 170         long number_of_equals = 0;
 171         bool has_open_bracket = false;
 172         bool in_quotes = false;
 173         error = false;
 174         if (!buffer)
 175         {
 176                 return "";
 177         }
 178         // firstly clean up the line by stripping spaces from the start and end and converting tabs to spaces
 179         for (int d = 0; d < strlen(buffer); d++)
 180                 if ((buffer[d]) == 9)
 181                         buffer[d] = ' ';
 182         while ((buffer[0] == ' ') && (strlen(buffer)>0)) buffer++;
 183         while ((buffer[strlen(buffer)-1] == ' ') && (strlen(buffer)>0)) buffer[strlen(buffer)-1] = '\0';
 184         // empty lines are syntactically valid
 185         if (!strcmp(buffer,""))
 186                 return "";
 187         else if (buffer[0] == '#')
 188                 return "";
 189         for (int c = 0; c < strlen(buffer); c++)
 190         {
 191                 // convert all spaces that are OUTSIDE quotes into hardspace (0xA0) as this will make them easier to
 192                 // search and replace later :)
 193                 if ((!in_quotes) && (buffer[c] == ' '))
 194                         buffer[c] = '\xA0';
 195                 if ((buffer[c] == '<') && (!in_quotes))
 196                 {
 197                         has_open_bracket = true;
 198                         if (strlen(buffer) == 1)
 199                         {
 200                                 *errorstream << "Tag without identifier at " << filename << ":" << linenumber << endl;
 201                                 error = true;
 202                                 return "";
 203                         }
 204                         else if ((tolower(buffer[c+1]) < 'a') || (tolower(buffer[c+1]) > 'z'))
 205                         {
 206                                 *errorstream << "Invalid characters in identifier at " << filename << ":" << linenumber << endl;
 207                                 error = true;
 208                                 return "";
 209                         }
 210                 }
 211                 if (buffer[c] == '"')
 212                 {
 213                         number_of_quotes++;
 214                         in_quotes = (!in_quotes);
 215                 }
 216                 if ((buffer[c] == '=') && (!in_quotes))
 217                 {
 218                         number_of_equals++;
 219                         if (strlen(buffer) == c)
 220                         {
 221                                 *errorstream << "Variable without a value at " << filename << ":" << linenumber << endl;
 222                                 error = true;
 223                                 return "";
 224                         }
 225                         else if (buffer[c+1] != '"')
 226                         {
 227                                 *errorstream << "Variable name not followed immediately by its value at " << filename << ":" << linenumber << endl;
 228                                 error = true;
 229                                 return "";
 230                         }
 231                         else if (!c)
 232                         {
 233                                 *errorstream << "Value without a variable (line starts with '=') at " << filename << ":" << linenumber << endl;
 234                                 error = true;
 235                                 return "";
 236                         }
 237                         else if (buffer[c-1] == '\xA0')
 238                         {
 239                                 *errorstream << "Variable name not followed immediately by its value at " << filename << ":" << linenumber << endl;
 240                                 error = true;
 241                                 return "";
 242                         }
 243                 }
 244         }
 245         // no quotes, and no equals. something freaky.
 246         if ((!number_of_quotes) || (!number_of_equals) && (strlen(buffer)>2) && (buffer[0]=='<'))
 247         {
 248                 *errorstream << "Malformed tag at " << filename << ":" << linenumber << endl;
 249                 error = true;
 250                 return "";
 251         }
 252         // odd number of quotes. thats just wrong.
 253         if ((number_of_quotes % 2) != 0)
 254         {
 255                 *errorstream << "Missing \" at " << filename << ":" << linenumber << endl;
 256                 error = true;
 257                 return "";
 258         }
 259         if (number_of_equals < (number_of_quotes/2))
 260         {
 261                 *errorstream << "Missing '=' at " << filename << ":" << linenumber << endl;
 262         }
 263         if (number_of_equals > (number_of_quotes/2))
 264         {
 265                 *errorstream << "Too many '=' at " << filename << ":" << linenumber << endl;
 266         }
 267
 268         std::string parsedata = buffer;
 269         // turn multispace into single space
 270         while (parsedata.find("\xA0\xA0") != std::string::npos)
 271         {
 272                 parsedata.erase(parsedata.find("\xA0\xA0"),1);
 273         }
 274
 275         // turn our hardspace back into softspace
 276         for (int d = 0; d < parsedata.length(); d++)
 277         {
 278                 if (parsedata[d] == '\xA0')
 279                         parsedata[d] = ' ';
 280         }
 281
 282         // and we're done, the line is fine!
 283         return parsedata;
 284 }
 285
 286 bool LoadConf(const char* filename, std::stringstream *target, std::stringstream* errorstream)
 287 {
 288         target->str("");
 289         errorstream->str("");
 290         long linenumber = 1;
 291         // first, check that the file exists before we try to do anything with it
 292         if (!FileExists(filename))
 293         {
 294                 *errorstream << "File " << filename << " not found." << endl;
 295                 return false;
 296         }
 297         // Fix the chmod of the file to restrict it to the current user and group
 298         chmod(filename,0600);
 299         // now open it
 300         FILE* conf = fopen(filename,"r");
 301         char buffer[MAXBUF];
 302         if (conf)
 303         {
 304                 while (!feof(conf))
 305                 {
 306                         if (fgets(buffer, MAXBUF, conf))
 307                         {
 308                                 if ((!feof(conf)) && (buffer) && (strlen(buffer)))
 309                                 {
 310                                         if ((buffer[0] != '#') && (buffer[0] != '\r')  && (buffer[0] != '\n'))
 311                                         {
 312                                                 bool error = false;
 313                                                 std::string data = ConfProcess(buffer,linenumber++,errorstream,error,filename);
 314                                                 if (error)
 315                                                 {
 316                                                         return false;
 317                                                 }
 318                                                 *target << data;
 319                                         }
 320                                         else linenumber++;
 321                                 }
 322                         }
 323                 }
 324                 fclose(conf);
 325         }
 326         target->seekg(0);
 327         return true;
 328 }
 329
 330 /* Counts the number of tags of a certain type within the config file, e.g. to enumerate opers */
 331
 332 int EnumConf(std::stringstream *config, const char* tag)
 333 {
 334         int ptr = 0;
 335         char buffer[MAXBUF], c_tag[MAXBUF], c, lastc;
 336         int in_token, in_quotes, tptr, j, idx = 0;
 337         char* key;
 338
 339         const char* buf = config->str().c_str();
 340         long bptr = 0;
 341         long len = strlen(buf);
 342
 343         ptr = 0;
 344         in_token = 0;
 345         in_quotes = 0;
 346         lastc = '\0';
 347         while (bptr<len)
 348         {
 349                 lastc = c;
 350                 c = buf[bptr++];
 351                 if ((c == '#') && (lastc == '\n'))
 352                 {
 353                         while ((c != '\n') && (bptr<len))
 354                         {
 355                                 lastc = c;
 356                                 c = buf[bptr++];
 357                         }
 358                 }
 359                 if ((c == '<') && (!in_quotes))
 360                 {
 361                         tptr = 0;
 362                         in_token = 1;
 363                         do {
 364                                 c = buf[bptr++];
 365                                 if (c != ' ')
 366                                 {
 367                                         c_tag[tptr++] = c;
 368                                         c_tag[tptr] = '\0';
 369                                 }
 370                         } while (c != ' ');
 371                 }
 372                 if (c == '"')
 373                 {
 374                         in_quotes = (!in_quotes);
 375                 }
 376                 if ((c == '>') && (!in_quotes))
 377                 {
 378                         in_token = 0;
 379                         if (!strcmp(c_tag,tag))
 380                         {
 381                                 /* correct tag, but wrong index */
 382                                 idx++;
 383                         }
 384                         c_tag[0] = '\0';
 385                         buffer[0] = '\0';
 386                         ptr = 0;
 387                         tptr = 0;
 388                 }
 389                 if (c != '>')
 390                 {
 391                         if ((in_token) && (c != '\n') && (c != '\r'))
 392                         {
 393                                 buffer[ptr++] = c;
 394                                 buffer[ptr] = '\0';
 395                         }
 396                 }
 397         }
 398         return idx;
 399 }
 400
 401 /* Counts the number of values within a certain tag */
 402
 403 int EnumValues(std::stringstream *config, const char* tag, int index)
 404 {
 405         int ptr = 0;
 406         char buffer[MAXBUF], c_tag[MAXBUF], c, lastc;
 407         int in_token, in_quotes, tptr, j, idx = 0;
 408         char* key;
 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 = strlen(buf);
 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         bzero((char *)&server,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,5);
 643                 return(TRUE);
 644         }
 645 }
 646
 647
 648 // Open a TCP Socket
 649 int OpenTCPSocket (void)
 650 {
 651         int sockfd;
 652         int on = 0;
 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 = 0;
 663                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, (const char*)&linger,sizeof(linger));
 664                 return (sockfd);
 665         }
 666 }
 667