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[1mInspire Internet Relay Chat Server, compiled " __DATE__ " at " __TIME__ "\n");
  78         printf("(C) ChatSpike Development team.\033[0;37m\n\n");
  79         printf("Developers:\033[1m     Brain, FrostyCoolSlug\n");
  80         printf("Documentation:\033[1m  FrostyCoolSlug, w00t\n");
  81         printf("Testers:\033[1m        typobox43, piggles, Lord_Zathras, CC\n");
  82         printf("Name concept:\033[1m   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 stdin, stdout, stderr */
 124         freopen("/dev/null","w",stdout);
 125         freopen("/dev/null","w",stderr);
 126
 127         setpriority(PRIO_PROCESS,(int)getpid(),15); /* ircd sets to low process priority so it doesnt hog the box */
 128
 129         return (TRUE);
 130 }
 131
 132
 133 /* Make Sure Modules Are Avaliable!
 134  * (BugFix By Craig.. See? I do work! :p)
 135  * Modified by brain, requires const char*
 136  * to work with other API functions
 137  */
 138
 139 bool FileExists (const char* file)
 140 {
 141         FILE *input;
 142         if ((input = fopen (file, "r")) == NULL)
 143         {
 144                 return(false);
 145         }
 146         else
 147         {
 148                 fclose (input);
 149                 return(true);
 150         }
 151 }
 152
 153 /* ConfProcess does the following things to a config line in the following order:
 154  *
 155  * Processes the line for syntax errors as shown below
 156  *      (1) Line void of quotes or equals (a malformed, illegal tag format)
 157  *      (2) Odd number of quotes on the line indicating a missing quote
 158  *      (3) number of equals signs not equal to number of quotes / 2 (missing an equals sign)
 159  *      (4) Spaces between the opening bracket (<) and the keyword
 160  *      (5) Spaces between a keyword and an equals sign
 161  *      (6) Spaces between an equals sign and a quote
 162  * Removes trailing spaces
 163  * Removes leading spaces
 164  * Converts tabs to spaces
 165  * Turns multiple spaces that are outside of quotes into single spaces
 166  */
 167
 168 std::string ConfProcess(char* buffer, long linenumber, std::stringstream* errorstream, bool &error, std::string filename)
 169 {
 170         long number_of_quotes = 0;
 171         long number_of_equals = 0;
 172         bool has_open_bracket = false;
 173         bool in_quotes = false;
 174         error = false;
 175         if (!buffer)
 176         {
 177                 return "";
 178         }
 179         // firstly clean up the line by stripping spaces from the start and end and converting tabs to spaces
 180         for (int d = 0; d < strlen(buffer); d++)
 181                 if ((buffer[d]) == 9)
 182                         buffer[d] = ' ';
 183         while ((buffer[0] == ' ') && (strlen(buffer)>0)) buffer++;
 184         while ((buffer[strlen(buffer)-1] == ' ') && (strlen(buffer)>0)) buffer[strlen(buffer)-1] = '\0';
 185         // empty lines are syntactically valid
 186         if (!strcmp(buffer,""))
 187                 return "";
 188         else if (buffer[0] == '#')
 189                 return "";
 190         for (int c = 0; c < strlen(buffer); c++)
 191         {
 192                 // convert all spaces that are OUTSIDE quotes into hardspace (0xA0) as this will make them easier to
 193                 // search and replace later :)
 194                 if ((!in_quotes) && (buffer[c] == ' '))
 195                         buffer[c] = '\xA0';
 196                 if ((buffer[c] == '<') && (!in_quotes))
 197                 {
 198                         has_open_bracket = true;
 199                         if (strlen(buffer) == 1)
 200                         {
 201                                 *errorstream << "Tag without identifier at " << filename << ":" << linenumber << endl;
 202                                 error = true;
 203                                 return "";
 204                         }
 205                         else if ((tolower(buffer[c+1]) < 'a') || (tolower(buffer[c+1]) > 'z'))
 206                         {
 207                                 *errorstream << "Invalid characters in identifier at " << filename << ":" << linenumber << endl;
 208                                 error = true;
 209                                 return "";
 210                         }
 211                 }
 212                 if (buffer[c] == '"')
 213                 {
 214                         number_of_quotes++;
 215                         in_quotes = (!in_quotes);
 216                 }
 217                 if ((buffer[c] == '=') && (!in_quotes))
 218                 {
 219                         number_of_equals++;
 220                         if (strlen(buffer) == c)
 221                         {
 222                                 *errorstream << "Variable without a value at " << filename << ":" << linenumber << endl;
 223                                 error = true;
 224                                 return "";
 225                         }
 226                         else if (buffer[c+1] != '"')
 227                         {
 228                                 *errorstream << "Variable name not followed immediately by its value at " << filename << ":" << linenumber << endl;
 229                                 error = true;
 230                                 return "";
 231                         }
 232                         else if (!c)
 233                         {
 234                                 *errorstream << "Value without a variable (line starts with '=') at " << filename << ":" << linenumber << endl;
 235                                 error = true;
 236                                 return "";
 237                         }
 238                         else if (buffer[c-1] == '\xA0')
 239                         {
 240                                 *errorstream << "Variable name not followed immediately by its value at " << filename << ":" << linenumber << endl;
 241                                 error = true;
 242                                 return "";
 243                         }
 244                 }
 245         }
 246         // no quotes, and no equals. something freaky.
 247         if ((!number_of_quotes) || (!number_of_equals) && (strlen(buffer)>2) && (buffer[0]=='<'))
 248         {
 249                 *errorstream << "Malformed tag at " << filename << ":" << linenumber << endl;
 250                 error = true;
 251                 return "";
 252         }
 253         // odd number of quotes. thats just wrong.
 254         if ((number_of_quotes % 2) != 0)
 255         {
 256                 *errorstream << "Missing \" at " << filename << ":" << linenumber << endl;
 257                 error = true;
 258                 return "";
 259         }
 260         if (number_of_equals < (number_of_quotes/2))
 261         {
 262                 *errorstream << "Missing '=' at " << filename << ":" << linenumber << endl;
 263         }
 264         if (number_of_equals > (number_of_quotes/2))
 265         {
 266                 *errorstream << "Too many '=' at " << filename << ":" << linenumber << endl;
 267         }
 268
 269         std::string parsedata = buffer;
 270         // turn multispace into single space
 271         while (parsedata.find("\xA0\xA0") != std::string::npos)
 272         {
 273                 parsedata.erase(parsedata.find("\xA0\xA0"),1);
 274         }
 275
 276         // turn our hardspace back into softspace
 277         for (int d = 0; d < parsedata.length(); d++)
 278         {
 279                 if (parsedata[d] == '\xA0')
 280                         parsedata[d] = ' ';
 281         }
 282
 283         // and we're done, the line is fine!
 284         return parsedata;
 285 }
 286
 287 bool LoadConf(const char* filename, std::stringstream *target, std::stringstream* errorstream)
 288 {
 289         target->str("");
 290         errorstream->str("");
 291         long linenumber = 1;
 292         // first, check that the file exists before we try to do anything with it
 293         if (!FileExists(filename))
 294         {
 295                 *errorstream << "File " << filename << " not found." << endl;
 296                 return false;
 297         }
 298         // Fix the chmod of the file to restrict it to the current user and group
 299         chmod(filename,0600);
 300         // now open it
 301         FILE* conf = fopen(filename,"r");
 302         char buffer[MAXBUF];
 303         if (conf)
 304         {
 305                 while (!feof(conf))
 306                 {
 307                         if (fgets(buffer, MAXBUF, conf))
 308                         {
 309                                 if ((!feof(conf)) && (buffer) && (strlen(buffer)))
 310                                 {
 311                                         if ((buffer[0] != '#') && (buffer[0] != '\r')  && (buffer[0] != '\n'))
 312                                         {
 313                                                 bool error = false;
 314                                                 std::string data = ConfProcess(buffer,linenumber++,errorstream,error,filename);
 315                                                 if (error)
 316                                                 {
 317                                                         return false;
 318                                                 }
 319                                                 *target << data;
 320                                         }
 321                                         else linenumber++;
 322                                 }
 323                         }
 324                 }
 325                 fclose(conf);
 326         }
 327         target->seekg(0);
 328         return true;
 329 }
 330
 331 /* Counts the number of tags of a certain type within the config file, e.g. to enumerate opers */
 332
 333 int EnumConf(std::stringstream *config, const char* tag)
 334 {
 335         int ptr = 0;
 336         char buffer[MAXBUF], c_tag[MAXBUF], c, lastc;
 337         int in_token, in_quotes, tptr, j, idx = 0;
 338         char* key;
 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, j, idx = 0;
 409         char* key;
 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 = strlen(buf);
 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 = 0;
 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 = 0;
 664                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, (const char*)&linger,sizeof(linger));
 665                 return (sockfd);
 666         }
 667 }
 668