proxyscan/proxyscan.c

   1
   2 #include "proxyscan.h"
   3
   4 #include <sys/poll.h>
   5 #include <sys/types.h>
   6 #include <sys/socket.h>
   7 #include <netdb.h>
   8 #include "../core/error.h"
   9 #include "../core/events.h"
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12 #include <errno.h>
  13 #include "../nick/nick.h"
  14 #include "../core/hooks.h"
  15 #include "../lib/sstring.h"
  16 #include "../irc/irc_config.h"
  17 #include "../localuser/localuser.h"
  18 #include "../core/config.h"
  19 #include <unistd.h>
  20 #include "../core/schedule.h"
  21 #include <string.h>
  22 #include "../irc/irc.h"
  23 #include "../lib/irc_string.h"
  24 #include "../lib/version.h"
  25 #include "../channel/channel.h"
  26 #include "../localuser/localuserchannel.h"
  27 #include "../core/nsmalloc.h"
  28 #include "../lib/irc_ipv6.h"
  29
  30 MODULE_VERSION("")
  31
  32 #define SCANTIMEOUT      60
  33
  34 #define SCANHOSTHASHSIZE 1000
  35 #define SCANHASHSIZE     400
  36
  37 /* It's unlikely you'll get 100k of preamble before a connect... */
  38 #define READ_SANITY_LIMIT 102400
  39
  40 scan *scantable[SCANHASHSIZE];
  41
  42 CommandTree *ps_commands;
  43
  44 int listenfd;
  45 int activescans;
  46 int maxscans;
  47 int queuedhosts;
  48 int scansdone;
  49 int rescaninterval;
  50 int warningsent;
  51 int glinedhosts;
  52 time_t ps_starttime;
  53 int ps_cache_ext;
  54 int ps_extscan_ext;
  55 int ps_ready;
  56
  57 int numscans; /* number of scan types currently valid */
  58 scantype thescans[PSCAN_MAXSCANS];
  59
  60 unsigned int hitsbyclass[10];
  61 unsigned int scansbyclass[10];
  62
  63 unsigned int myip;
  64 sstring *myipstr;
  65 unsigned short listenport;
  66 int brokendb;
  67
  68 unsigned int ps_mailip;
  69 unsigned int ps_mailport;
  70 sstring *ps_mailname;
  71
  72 unsigned long scanspermin;
  73 unsigned long tempscanspermin=0;
  74 unsigned long lastscants=0;
  75
  76 unsigned int ps_start_ts=0;
  77
  78 nick *proxyscannick;
  79
  80 FILE *ps_logfile;
  81
  82 /* Local functions */
  83 void handlescansock(int fd, short events);
  84 void timeoutscansock(void *arg);
  85 void proxyscan_newnick(int hooknum, void *arg);
  86 void proxyscan_lostnick(int hooknum, void *arg);
  87 void proxyscan_onconnect(int hooknum, void *arg);
  88 void proxyscanuserhandler(nick *target, int message, void **params);
  89 void registerproxyscannick();
  90 void killsock(scan *sp, int outcome);
  91 void killallscans();
  92 void proxyscanstats(int hooknum, void *arg);
  93 void sendlagwarning();
  94 void proxyscan_newip(nick *np, unsigned long ip);
  95 int proxyscan_addscantype(int type, int port);
  96 int proxyscan_delscantype(int type, int port);
  97
  98 int proxyscandostatus(void *sender, int cargc, char **cargv);
  99 int proxyscandebug(void *sender, int cargc, char **cargv);
 100 int proxyscandosave(void *sender, int cargc, char **cargv);
 101 int proxyscandospew(void *sender, int cargc, char **cargv);
 102 int proxyscandoshowkill(void *sender, int cargc, char **cargv);
 103 int proxyscandoscan(void *sender, int cargc, char **cargv);
 104 int proxyscandoaddscan(void *sender, int cargc, char **cargv);
 105 int proxyscandodelscan(void *sender, int cargc, char **cargv);
 106 int proxyscandoshowcommands(void *sender, int cargc, char **cargv);
 107
 108 int proxyscan_addscantype(int type, int port) {
 109   /* Check we have a spare scan slot */
 110
 111   if (numscans>=PSCAN_MAXSCANS)
 112     return 1;
 113
 114   thescans[numscans].type=type;
 115   thescans[numscans].port=port;
 116   thescans[numscans].hits=0;
 117
 118   numscans++;
 119
 120   return 0;
 121 }
 122
 123 int proxyscan_delscantype(int type, int port) {
 124   int i;
 125
 126   for (i=0;i<numscans;i++)
 127     if (thescans[i].type==type && thescans[i].port==port)
 128       break;
 129
 130   if (i>=numscans)
 131     return 1;
 132
 133   memmove(thescans+i, thescans+(i+1), (PSCAN_MAXSCANS-(i+1)) * sizeof(scantype));
 134   numscans--;
 135
 136   return 0;
 137 }
 138
 139 void _init(void) {
 140   sstring *cfgstr;
 141   int ipbits[4];
 142
 143   ps_start_ts = time(NULL);
 144   ps_ready = 0;
 145   ps_commands = NULL;
 146
 147   ps_cache_ext = registernodeext("proxyscancache");
 148   if( ps_cache_ext == -1 ) {
 149     Error("proxyscan",ERR_INFO,"failed to reg node ext");
 150     return;
 151   }
 152   ps_extscan_ext = registernodeext("proxyscanextscan");
 153   if ( ps_extscan_ext == -1) {
 154     Error("proxyscan",ERR_INFO,"failed to reg node ext");
 155     return;
 156   }
 157
 158   memset(scantable,0,sizeof(scantable));
 159   maxscans=200;
 160   activescans=0;
 161   queuedhosts=0;
 162   scansdone=0;
 163   warningsent=0;
 164   ps_starttime=time(NULL);
 165   glinedhosts=0;
 166
 167   scanspermin=0;
 168   lastscants=time(NULL);
 169
 170   /* Listen port */
 171   cfgstr=getcopyconfigitem("proxyscan","port","9999",6);
 172   listenport=strtol(cfgstr->content,NULL,10);
 173   freesstring(cfgstr);
 174
 175   /* Max concurrent scans */
 176   cfgstr=getcopyconfigitem("proxyscan","maxscans","200",5);
 177   maxscans=strtol(cfgstr->content,NULL,10);
 178   freesstring(cfgstr);
 179
 180   /* Clean host timeout */
 181   cfgstr=getcopyconfigitem("proxyscan","rescaninterval","3600",7);
 182   rescaninterval=strtol(cfgstr->content,NULL,10);
 183   cachehostinit(rescaninterval);
 184   freesstring(cfgstr);
 185
 186   /* this default will NOT work well */
 187   myipstr=getcopyconfigitem("proxyscan","ip","127.0.0.1",16);
 188
 189   sscanf(myipstr->content,"%d.%d.%d.%d",&ipbits[0],&ipbits[1],&ipbits[2],&ipbits[3]);
 190
 191   myip=((ipbits[0]&0xFF)<<24)+((ipbits[1]&0xFF)<<16)+
 192     ((ipbits[2]&0xFF)<<8)+(ipbits[3]&0xFF);
 193
 194 #if defined(PROXYSCAN_MAIL)
 195   /* Mailer host */
 196   cfgstr=getcopyconfigitem("proxyscan","mailerip","",16);
 197
 198   psm_mailerfd=-1;
 199   if (cfgstr) {
 200     sscanf(cfgstr->content,"%d.%d.%d.%d",&ipbits[0],&ipbits[1],&ipbits[2],&ipbits[3]);
 201     ps_mailip = ((ipbits[0]&0xFF)<<24)+((ipbits[1]&0xFF)<<16)+
 202                  ((ipbits[2]&0xFF)<<8)+(ipbits[3]&0xFF);
 203     ps_mailport=25;
 204     freesstring(cfgstr);
 205
 206     ps_mailname=getcopyconfigitem("proxyscan","mailname","some.mail.server",HOSTLEN);
 207     Error("proxyscan",ERR_INFO,"Proxyscan mailer enabled; mailing to %s as %s.",IPlongtostr(ps_mailip),ps_mailname->content);
 208   } else {
 209     ps_mailport=0;
 210     ps_mailname=NULL;
 211   }
 212 #endif
 213
 214   proxyscannick=NULL;
 215   /* Set up our nick on the network */
 216   scheduleoneshot(time(NULL),&registerproxyscannick,NULL);
 217
 218   registerhook(HOOK_SERVER_END_OF_BURST, &proxyscan_onconnect);
 219
 220   registerhook(HOOK_NICK_NEWNICK,&proxyscan_newnick);
 221
 222   registerhook(HOOK_CORE_STATSREQUEST,&proxyscanstats);
 223
 224   /* Read in the clean hosts */
 225   loadcachehosts();
 226
 227   /* Read in any custom ports to scan */
 228   loadextrascans();
 229
 230   /* Set up the database */
 231   if ((proxyscandbinit())!=0) {
 232     brokendb=1;
 233   } else {
 234     brokendb=0;
 235   }
 236
 237   ps_commands = newcommandtree();
 238   addcommandtotree(ps_commands, "showcommands", 0, 0, &proxyscandoshowcommands);
 239   addcommandtotree(ps_commands, "status", 0, 0, &proxyscandostatus);
 240   addcommandtotree(ps_commands, "listopen", 0, 0, &proxyscandolistopen);
 241   addcommandtotree(ps_commands, "save", 0, 0, &proxyscandosave);
 242   addcommandtotree(ps_commands, "spew", 0, 0, &proxyscandospew);
 243   addcommandtotree(ps_commands, "showkill", 0, 0, &proxyscandoshowkill);
 244   addcommandtotree(ps_commands, "scan", 0, 0, &proxyscandoscan);
 245   addcommandtotree(ps_commands, "addscan", 0, 0, &proxyscandoaddscan);
 246   addcommandtotree(ps_commands, "delscan", 0, 0, &proxyscandodelscan);
 247
 248   /* Default scan types */
 249   proxyscan_addscantype(STYPE_HTTP, 8080);
 250   proxyscan_addscantype(STYPE_HTTP, 80);
 251   proxyscan_addscantype(STYPE_HTTP, 6588);
 252   proxyscan_addscantype(STYPE_HTTP, 8000);
 253   proxyscan_addscantype(STYPE_HTTP, 3128);
 254   proxyscan_addscantype(STYPE_HTTP, 3802);
 255   proxyscan_addscantype(STYPE_HTTP, 5490);
 256   proxyscan_addscantype(STYPE_HTTP, 7441);
 257   proxyscan_addscantype(STYPE_HTTP, 808);
 258   proxyscan_addscantype(STYPE_HTTP, 3332);
 259   proxyscan_addscantype(STYPE_HTTP, 2282);
 260   proxyscan_addscantype(STYPE_SOCKS4, 559);
 261   proxyscan_addscantype(STYPE_SOCKS4, 1080);
 262   proxyscan_addscantype(STYPE_SOCKS5, 1080);
 263   proxyscan_addscantype(STYPE_SOCKS4, 1075);
 264   proxyscan_addscantype(STYPE_SOCKS5, 1075);
 265   proxyscan_addscantype(STYPE_SOCKS4, 2280);
 266   proxyscan_addscantype(STYPE_SOCKS5, 2280);
 267   proxyscan_addscantype(STYPE_SOCKS4, 1180);
 268   proxyscan_addscantype(STYPE_SOCKS5, 1180);
 269   proxyscan_addscantype(STYPE_SOCKS4, 9999);
 270   proxyscan_addscantype(STYPE_SOCKS5, 9999);
 271   proxyscan_addscantype(STYPE_WINGATE, 23);
 272   proxyscan_addscantype(STYPE_CISCO, 23);
 273   proxyscan_addscantype(STYPE_WINGATE, 1181);
 274   proxyscan_addscantype(STYPE_SOCKS5, 1978);
 275   proxyscan_addscantype(STYPE_SOCKS5, 1029);
 276   proxyscan_addscantype(STYPE_SOCKS5, 3801);
 277   proxyscan_addscantype(STYPE_SOCKS5, 3331);
 278   proxyscan_addscantype(STYPE_HTTP, 65506);
 279   proxyscan_addscantype(STYPE_HTTP, 63809);
 280   proxyscan_addscantype(STYPE_HTTP, 63000);
 281   proxyscan_addscantype(STYPE_SOCKS4, 29992);
 282   proxyscan_addscantype(STYPE_DIRECT_IRC, 6666);
 283   proxyscan_addscantype(STYPE_DIRECT_IRC, 6667);
 284   proxyscan_addscantype(STYPE_DIRECT_IRC, 6668);
 285   proxyscan_addscantype(STYPE_DIRECT_IRC, 6669);
 286   proxyscan_addscantype(STYPE_DIRECT_IRC, 6670);
 287
 288   /* Schedule saves */
 289   schedulerecurring(time(NULL)+3600,0,3600,&dumpcachehosts,NULL);
 290
 291   ps_logfile=fopen("logs/proxyscan.log","a");
 292
 293   if (connected) {
 294     /* if we're already connected, assume we're just reloading module (i.e. have a completed burst) */
 295     ps_ready = 1;
 296     startqueuedscans();
 297   }
 298 }
 299
 300 void registerproxyscannick(void *arg) {
 301   sstring *psnick,*psuser,*pshost,*psrealname;
 302   /* Set up our nick on the network */
 303   channel *cp;
 304
 305   psnick=getcopyconfigitem("proxyscan","nick","P",NICKLEN);
 306   psuser=getcopyconfigitem("proxyscan","user","proxyscan",USERLEN);
 307   pshost=getcopyconfigitem("proxyscan","host","some.host",HOSTLEN);
 308   psrealname=getcopyconfigitem("proxyscan","realname","Proxyscan",REALLEN);
 309
 310   proxyscannick=registerlocaluser(psnick->content,psuser->content,pshost->content,
 311                                   psrealname->content,
 312                                   NULL,UMODE_OPER|UMODE_SERVICE|UMODE_DEAF,
 313                                   &proxyscanuserhandler);
 314
 315   freesstring(psnick);
 316   freesstring(psuser);
 317   freesstring(pshost);
 318   freesstring(psrealname);
 319
 320   cp=findchannel("#twilightzone");
 321   if (!cp) {
 322     localcreatechannel(proxyscannick,"#twilightzone");
 323   } else {
 324     localjoinchannel(proxyscannick,cp);
 325     localgetops(proxyscannick,cp);
 326   }
 327 }
 328
 329 void _fini(void) {
 330
 331   deregisterlocaluser(proxyscannick,NULL);
 332
 333   deregisterhook(HOOK_SERVER_END_OF_BURST, &proxyscan_onconnect);
 334
 335   deregisterhook(HOOK_NICK_NEWNICK,&proxyscan_newnick);
 336
 337   deregisterhook(HOOK_CORE_STATSREQUEST,&proxyscanstats);
 338
 339   deleteschedule(NULL,&dumpcachehosts,NULL);
 340
 341   destroycommandtree(ps_commands);
 342
 343   /* Kill any scans in progress */
 344   killallscans();
 345
 346   /* Dump the database - AFTER killallscans() which prunes it */
 347   dumpcachehosts(NULL);
 348
 349   /* dump any cached hosts before deleting the extensions */
 350   releasenodeext(ps_cache_ext);
 351   releasenodeext(ps_extscan_ext);
 352
 353   /* free() all our structures */
 354   nsfreeall(POOL_PROXYSCAN);
 355
 356   freesstring(myipstr);
 357   freesstring(ps_mailname);
 358 #if defined(PROXYSCAN_MAIL)
 359   if (psm_mailerfd!=-1)
 360     deregisterhandler(psm_mailerfd,1);
 361 #endif
 362
 363   if (ps_logfile)
 364     fclose(ps_logfile);
 365 }
 366
 367 void proxyscanuserhandler(nick *target, int message, void **params) {
 368   nick *sender;
 369   Command *ps_command;
 370   char *cargv[20];
 371   int cargc;
 372
 373   switch(message) {
 374   case LU_KILLED:
 375     scheduleoneshot(time(NULL)+1,&registerproxyscannick,NULL);
 376     proxyscannick=NULL;
 377     break;
 378
 379   case LU_PRIVMSG:
 380   case LU_SECUREMSG:
 381     sender=(nick *)params[0];
 382
 383     if (IsOper(sender)) {
 384       cargc = splitline((char *)params[1], cargv, 20, 0);
 385
 386       if ( cargc == 0 )
 387         return;
 388
 389       ps_command = findcommandintree(ps_commands, cargv[0], 1);
 390
 391       if ( !ps_command ) {
 392         sendnoticetouser(proxyscannick,sender, "Unknown command.");
 393         return;
 394       }
 395
 396       if ( ps_command->maxparams < (cargc-1) ) {
 397         rejoinline(cargv[ps_command->maxparams], cargc - (ps_command->maxparams));
 398         cargc = (ps_command->maxparams) + 1;
 399       }
 400
 401       (ps_command->handler)((void *)sender, cargc - 1, &(cargv[1]));
 402       break;
 403     }
 404
 405   default:
 406     break;
 407   }
 408 }
 409
 410 void addscantohash(scan *sp) {
 411   int hash;
 412   hash=(sp->fd)%SCANHASHSIZE;
 413
 414   sp->next=scantable[hash];
 415   scantable[hash]=sp;
 416
 417   activescans++;
 418 }
 419
 420 void delscanfromhash(scan *sp) {
 421   int hash;
 422   scan **sh;
 423
 424   hash=(sp->fd)%SCANHASHSIZE;
 425
 426   for (sh=&(scantable[hash]);*sh;sh=&((*sh)->next)) {
 427     if (*sh==sp) {
 428       (*sh)=sp->next;
 429       break;
 430     }
 431   }
 432
 433   activescans--;
 434 }
 435
 436 scan *findscan(int fd) {
 437   int hash;
 438   scan *sp;
 439
 440   hash=fd%SCANHASHSIZE;
 441
 442   for (sp=scantable[hash];sp;sp=sp->next)
 443     if (sp->fd==fd)
 444       return sp;
 445
 446   return NULL;
 447 }
 448
 449 void startscan(patricia_node_t *node, int type, int port, int class) {
 450   scan *sp;
 451   float scantmp;
 452
 453   if (scansdone>maxscans)
 454   {
 455     /* ignore the first maxscans as this will skew our scans per second! */
 456     tempscanspermin++;
 457     if ((lastscants+60) <= time(NULL))
 458     {
 459       /* ok, at least 60 seconds has passed, calculate the scans per minute figure */
 460       scantmp = time(NULL) - lastscants;
 461       scantmp = tempscanspermin / scantmp;
 462       scantmp = (scantmp * 60);
 463       scanspermin = scantmp;
 464       lastscants = time(NULL);
 465       tempscanspermin = 0;
 466     }
 467   }
 468
 469   sp=getscan();
 470
 471   sp->outcome=SOUTCOME_INPROGRESS;
 472   sp->port=port;
 473   sp->node=node;
 474   sp->type=type;
 475   sp->class=class;
 476   sp->bytesread=0;
 477   sp->totalbytesread=0;
 478   memset(sp->readbuf, '\0', PSCAN_READBUFSIZE);
 479
 480   sp->fd=createconnectsocket(irc_in_addr_v4_to_int(&((patricia_node_t *)sp->node)->prefix->sin),sp->port);
 481   sp->state=SSTATE_CONNECTING;
 482   if (sp->fd<0) {
 483     /* Couldn't set up the socket? */
 484     derefnode(iptree,sp->node);
 485     freescan(sp);
 486     return;
 487   }
 488   /* Wait until it is writeable */
 489   registerhandler(sp->fd,POLLERR|POLLHUP|POLLOUT,&handlescansock);
 490   /* And set a timeout */
 491   sp->sch=scheduleoneshot(time(NULL)+SCANTIMEOUT,&timeoutscansock,(void *)sp);
 492   addscantohash(sp);
 493 }
 494
 495 void timeoutscansock(void *arg) {
 496   scan *sp=(scan *)arg;
 497
 498   killsock(sp, SOUTCOME_CLOSED);
 499 }
 500
 501 void killsock(scan *sp, int outcome) {
 502   int i;
 503   cachehost *chp;
 504   foundproxy *fpp;
 505
 506   scansdone++;
 507   scansbyclass[sp->class]++;
 508
 509   /* Remove the socket from the schedule/event lists */
 510   deregisterhandler(sp->fd,1);  /* this will close the fd for us */
 511   deleteschedule(sp->sch,&timeoutscansock,(void *)sp);
 512
 513   sp->outcome=outcome;
 514   delscanfromhash(sp);
 515
 516   /* See if we need to queue another scan.. */
 517   if (sp->outcome==SOUTCOME_CLOSED &&
 518       ((sp->class==SCLASS_CHECK) ||
 519        (sp->class==SCLASS_NORMAL && (sp->state==SSTATE_SENTREQUEST || sp->state==SSTATE_GOTRESPONSE))))
 520     queuescan(sp->node, sp->type, sp->port, SCLASS_PASS2, time(NULL)+300);
 521
 522   if (sp->outcome==SOUTCOME_CLOSED && sp->class==SCLASS_PASS2)
 523     queuescan(sp->node, sp->type, sp->port, SCLASS_PASS3, time(NULL)+300);
 524
 525   if (sp->outcome==SOUTCOME_CLOSED && sp->class==SCLASS_PASS3)
 526     queuescan(sp->node, sp->type, sp->port, SCLASS_PASS4, time(NULL)+300);
 527
 528   if (sp->outcome==SOUTCOME_OPEN) {
 529     hitsbyclass[sp->class]++;
 530
 531     /* Lets try and get the cache record.  If there isn't one, make a new one. */
 532     if (!(chp=findcachehost(sp->node))) {
 533       chp=addcleanhost(time(NULL));
 534       patricia_ref_prefix(sp->node->prefix);
 535       sp->node->exts[ps_cache_ext] = chp;
 536     }
 537     /* Stick it on the cache's list of proxies, if necessary */
 538     for (fpp=chp->proxies;fpp;fpp=fpp->next)
 539       if (fpp->type==sp->type && fpp->port==sp->port)
 540         break;
 541
 542     if (!fpp) {
 543       fpp=getfoundproxy();
 544       fpp->type=sp->type;
 545       fpp->port=sp->port;
 546       fpp->next=chp->proxies;
 547       chp->proxies=fpp;
 548     }
 549
 550     if (!chp->glineid) {
 551       glinedhosts++;
 552       loggline(chp, sp->node);
 553       irc_send("%s GL * +*@%s 1800 %jd :Open Proxy, see http://www.quakenet.org/openproxies.html - ID: %d",
 554                mynumeric->content,IPtostr(((patricia_node_t *)sp->node)->prefix->sin),(intmax_t)getnettime(), chp->glineid);
 555       Error("proxyscan",ERR_DEBUG,"Found open proxy on host %s",IPtostr(((patricia_node_t *)sp->node)->prefix->sin));
 556     } else {
 557       loggline(chp, sp->node);  /* Update log only */
 558     }
 559
 560     /* Update counter */
 561     for(i=0;i<numscans;i++) {
 562       if (thescans[i].type==sp->type && thescans[i].port==sp->port) {
 563         thescans[i].hits++;
 564         break;
 565       }
 566     }
 567   }
 568
 569   freescan(sp);
 570
 571   /* kick the queue.. */
 572   startqueuedscans();
 573 }
 574
 575 void handlescansock(int fd, short events) {
 576   scan *sp;
 577   char buf[512];
 578   int res;
 579   int i;
 580   unsigned long netip;
 581   unsigned short netport;
 582
 583   if ((sp=findscan(fd))==NULL) {
 584     /* Not found; return and hope it goes away */
 585     Error("proxyscan",ERR_ERROR,"Unexpected message from fd %d",fd);
 586     return;
 587   }
 588
 589   /* It woke up, delete the alarm call.. */
 590   deleteschedule(sp->sch,&timeoutscansock,(void *)sp);
 591
 592   if (events & (POLLERR|POLLHUP)) {
 593     /* Some kind of error; give up on this socket */
 594     if (sp->state==SSTATE_GOTRESPONSE) {
 595       /* If the error occured while we were waiting for a response, we might have
 596        * received the "OPEN PROXY!" message and the EOF at the same time, so continue
 597        * processing */
 598 /*      Error("proxyscan",ERR_DEBUG,"Got error in GOTRESPONSE state for %s, continuing.",IPtostr(sp->host->IP)); */
 599     } else {
 600       killsock(sp, SOUTCOME_CLOSED);
 601       return;
 602     }
 603   }
 604
 605   /* Otherwise, we got what we wanted.. */
 606
 607   switch(sp->state) {
 608   case SSTATE_CONNECTING:
 609     /* OK, we got activity while connecting, so we're going to send some
 610      * request depending on scan type.  However, we can reregister everything
 611      * here to save duplicate code: This code is common for all handlers */
 612
 613     /* Delete the old handler */
 614     deregisterhandler(fd,0);
 615     /* Set the new one */
 616     registerhandler(fd,POLLERR|POLLHUP|POLLIN,&handlescansock);
 617     sp->sch=scheduleoneshot(time(NULL)+SCANTIMEOUT,&timeoutscansock,(void *)sp);
 618     /* Update state */
 619     sp->state=SSTATE_SENTREQUEST;
 620
 621     switch(sp->type) {
 622     case STYPE_HTTP:
 623       sprintf(buf,"CONNECT %s:%d HTTP/1.0\r\n\r\n",myipstr->content,listenport);
 624       if ((write(fd,buf,strlen(buf)))<strlen(buf)) {
 625         /* We didn't write the full amount, DIE */
 626         killsock(sp,SOUTCOME_CLOSED);
 627         return;
 628       }
 629       break;
 630
 631     case STYPE_SOCKS4:
 632       /* set up the buffer */
 633       netip=htonl(myip);
 634       netport=htons(listenport);
 635       memcpy(&buf[4],&netip,4);
 636       memcpy(&buf[2],&netport,2);
 637       buf[0]=4;
 638       buf[1]=1;
 639       buf[8]=0;
 640       if ((write(fd,buf,9))<9) {
 641         /* Didn't write enough, give up */
 642         killsock(sp,SOUTCOME_CLOSED);
 643         return;
 644       }
 645       break;
 646
 647     case STYPE_SOCKS5:
 648       /* Set up initial request buffer */
 649       buf[0]=5;
 650       buf[1]=1;
 651       buf[2]=0;
 652       if ((write(fd,buf,3))>3) {
 653         /* Didn't write enough, give up */
 654         killsock(sp,SOUTCOME_CLOSED);
 655         return;
 656       }
 657
 658       /* Now the actual connect request */
 659       buf[0]=5;
 660       buf[1]=1;
 661       buf[2]=0;
 662       buf[3]=1;
 663       netip=htonl(myip);
 664       netport=htons(listenport);
 665       memcpy(&buf[4],&netip,4);
 666       memcpy(&buf[8],&netport,2);
 667       res=write(fd,buf,10);
 668       if (res<10) {
 669         killsock(sp,SOUTCOME_CLOSED);
 670         return;
 671       }
 672       break;
 673
 674     case STYPE_WINGATE:
 675       /* Send wingate request */
 676       sprintf(buf,"%s:%d\r\n",myipstr->content,listenport);
 677       if((write(fd,buf,strlen(buf)))<strlen(buf)) {
 678         killsock(sp,SOUTCOME_CLOSED);
 679         return;
 680       }
 681       break;
 682
 683     case STYPE_CISCO:
 684       /* Send cisco request */
 685       sprintf(buf,"cisco\r\n");
 686       if ((write(fd,buf,strlen(buf)))<strlen(buf)) {
 687         killsock(sp, SOUTCOME_CLOSED);
 688         return;
 689       }
 690
 691       sprintf(buf,"telnet %s %d\r\n",myipstr->content,listenport);
 692       if ((write(fd,buf,strlen(buf)))<strlen(buf)) {
 693         killsock(sp, SOUTCOME_CLOSED);
 694         return;
 695       }
 696
 697       break;
 698
 699     case STYPE_DIRECT:
 700       /* Do nothing */
 701       break;
 702
 703     case STYPE_DIRECT_IRC:
 704       sprintf(buf,"PRIVMSG\r\n");
 705       if ((write(fd,buf,strlen(buf)))<strlen(buf)) {
 706         killsock(sp, SOUTCOME_CLOSED);
 707         return;
 708       }
 709
 710       /* Do nothing */
 711       break;
 712     }
 713     break;
 714
 715   case SSTATE_SENTREQUEST:
 716     res=read(fd, sp->readbuf+sp->bytesread, PSCAN_READBUFSIZE-sp->bytesread);
 717
 718     if (res<=0) {
 719       if ((errno!=EINTR && errno!=EWOULDBLOCK) || res==0) {
 720         /* EOF, forget it */
 721         killsock(sp, SOUTCOME_CLOSED);
 722         return;
 723       }
 724     }
 725
 726     sp->bytesread+=res;
 727     sp->totalbytesread+=res;
 728
 729     {
 730       char *magicstring;
 731       int magicstringlength;
 732
 733       if(sp->type != STYPE_DIRECT_IRC) {
 734         magicstring = MAGICSTRING;
 735         magicstringlength = MAGICSTRINGLENGTH;
 736       } else {
 737         magicstring = MAGICIRCSTRING;
 738         magicstringlength = MAGICIRCSTRINGLENGTH;
 739       }
 740
 741       for (i=0;i<sp->bytesread - magicstringlength;i++) {
 742         if (!strncmp(sp->readbuf+i, magicstring, magicstringlength)) {
 743           /* Found the magic string */
 744           /* If the offset is 0, this means it was the first thing we got from the socket,
 745            * so it's an actual IRCD (sheesh).  Note that when the buffer is full and moved,
 746            * the thing moved to offset 0 would previously have been tested as offset
 747            * PSCAN_READBUFSIZE/2.
 748            *
 749            * Skip this checking for STYPE_DIRECT scans, which are used to detect trojans setting
 750            * up portforwards (which will therefore show up as ircds, we rely on the port being
 751            * strange enough to avoid false positives */
 752           if (i==0 && (sp->type != STYPE_DIRECT)) {
 753             killsock(sp, SOUTCOME_CLOSED);
 754             return;
 755           }
 756
 757           killsock(sp, SOUTCOME_OPEN);
 758           return;
 759         }
 760       }
 761     }
 762
 763     /* If the buffer is full, move half of it along to make room */
 764     if (sp->bytesread == PSCAN_READBUFSIZE) {
 765       memcpy(sp->readbuf, sp->readbuf + (PSCAN_READBUFSIZE)/2, PSCAN_READBUFSIZE/2);
 766       sp->bytesread = PSCAN_READBUFSIZE/2;
 767     }
 768
 769     /* Don't read data forever.. */
 770     if (sp->totalbytesread > READ_SANITY_LIMIT) {
 771       killsock(sp, SOUTCOME_CLOSED);
 772       return;
 773     }
 774
 775     /* No magic string yet, we schedule another timeout in case it comes later. */
 776     sp->sch=scheduleoneshot(time(NULL)+SCANTIMEOUT,&timeoutscansock,(void *)sp);
 777     return;
 778   }
 779 }
 780
 781 void killallscans() {
 782   int i;
 783   scan *sp;
 784   cachehost *chp;
 785
 786   for(i=0;i<SCANHASHSIZE;i++) {
 787     for(sp=scantable[i];sp;sp=sp->next) {
 788       /* If there is a pending scan, delete it's clean host record.. */
 789       if ((chp=findcachehost(sp->node)) && !chp->proxies) {
 790         sp->node->exts[ps_cache_ext] = NULL;
 791         derefnode(iptree,sp->node);
 792         delcachehost(chp);
 793       }
 794
 795       if (sp->fd!=-1) {
 796         deregisterhandler(sp->fd,1);
 797         deleteschedule(sp->sch,&timeoutscansock,(void *)(sp));
 798       }
 799     }
 800   }
 801 }
 802
 803 void proxyscanstats(int hooknum, void *arg) {
 804   char buf[512];
 805
 806   sprintf(buf, "Proxyscn: %6d/%4d scans complete/in progress.  %d hosts queued.",
 807           scansdone,activescans,queuedhosts);
 808   triggerhook(HOOK_CORE_STATSREPLY,buf);
 809   sprintf(buf, "Proxyscn: %6u known clean hosts",cleancount());
 810   triggerhook(HOOK_CORE_STATSREPLY,buf);
 811 }
 812
 813 void sendlagwarning() {
 814   int i,j;
 815   nick *np;
 816
 817   for (i=0;i<MAXSERVERS;i++) {
 818     if (serverlist[i].maxusernum>0) {
 819       for(j=0;j<serverlist[i].maxusernum;j++) {
 820         np=servernicks[i][j];
 821         if (np!=NULL && IsOper(np)) {
 822           sendnoticetouser(proxyscannick,np,"Warning: More than 20,000 hosts to scan - I'm lagging behind badly!");
 823         }
 824       }
 825     }
 826   }
 827 }
 828
 829 int pscansort(const void *a, const void *b) {
 830   int ra = *((const int *)a);
 831   int rb = *((const int *)b);
 832
 833   return thescans[ra].hits - thescans[rb].hits;
 834 }
 835
 836 int proxyscandostatus(void *sender, int cargc, char **cargv) {
 837   nick *np = (nick *) sender;
 838   int i;
 839   int totaldetects=0;
 840   int ord[PSCAN_MAXSCANS];
 841
 842   sendnoticetouser(proxyscannick,np,"Service uptime: %s",longtoduration(time(NULL)-ps_starttime, 1));
 843   sendnoticetouser(proxyscannick,np,"Total scans completed:  %d",scansdone);
 844   sendnoticetouser(proxyscannick,np,"Total hosts glined:     %d",glinedhosts);
 845
 846   sendnoticetouser(proxyscannick,np,"pendingscan structures: %lu x %lu bytes = %lu bytes total",countpendingscan,
 847         sizeof(pendingscan), (countpendingscan * sizeof(pendingscan)));
 848
 849   sendnoticetouser(proxyscannick,np,"Currently active scans: %d/%d",activescans,maxscans);
 850   sendnoticetouser(proxyscannick,np,"Processing speed:       %lu scans per minute",scanspermin);
 851   sendnoticetouser(proxyscannick,np,"Normal queued scans:    %d",normalqueuedscans);
 852   sendnoticetouser(proxyscannick,np,"Timed queued scans:     %d",prioqueuedscans);
 853   sendnoticetouser(proxyscannick,np,"'Clean' cached hosts:   %d",cleancount());
 854   sendnoticetouser(proxyscannick,np,"'Dirty' cached hosts:   %d",dirtycount());
 855
 856   sendnoticetouser(proxyscannick,np,"Extra scans: %d", extrascancount());
 857   for (i=0;i<5;i++)
 858     sendnoticetouser(proxyscannick,np,"Open proxies, class %1d:  %d/%d (%.2f%%)",i,hitsbyclass[i],scansbyclass[i],((float)hitsbyclass[i]*100)/scansbyclass[i]);
 859
 860   for (i=0;i<numscans;i++)
 861     totaldetects+=thescans[i].hits;
 862
 863   for (i=0;i<numscans;i++)
 864     ord[i]=i;
 865
 866   qsort(ord,numscans,sizeof(int),pscansort);
 867
 868   sendnoticetouser(proxyscannick,np,"Scan type Port  Detections");
 869   for (i=0;i<numscans;i++)
 870     sendnoticetouser(proxyscannick,np,"%-9s %-5d %d (%.2f%%)",
 871                      scantostr(thescans[ord[i]].type), thescans[ord[i]].port, thescans[ord[i]].hits, ((float)thescans[ord[i]].hits*100)/totaldetects);
 872
 873   sendnoticetouser(proxyscannick,np,"End of list.");
 874   return CMD_OK;
 875 }
 876
 877 int proxyscandebug(void *sender, int cargc, char **cargv) {
 878   /* Dump all scans.. */
 879   int i;
 880   int activescansfound=0;
 881   int totalscansfound=0;
 882   scan *sp;
 883   nick *np = (nick *)sender;
 884
 885   sendnoticetouser(proxyscannick,np,"Active scans : %d",activescans);
 886
 887   for (i=0;i<SCANHASHSIZE;i++) {
 888     for (sp=scantable[i];sp;sp=sp->next) {
 889       if (sp->outcome==SOUTCOME_INPROGRESS) {
 890         activescansfound++;
 891       }
 892       totalscansfound++;
 893       sendnoticetouser(proxyscannick,np,"fd: %d type: %d port: %d state: %d outcome: %d IP: %s",
 894                        sp->fd,sp->type,sp->port,sp->state,sp->outcome,IPtostr(((patricia_node_t *)sp->node)->prefix->sin));
 895     }
 896   }
 897
 898   sendnoticetouser(proxyscannick,np,"Total %d scans actually found (%d active)",totalscansfound,activescansfound);
 899   return CMD_OK;
 900 }
 901
 902 void proxyscan_onconnect(int hooknum, void *arg) {
 903   ps_ready = 1;
 904
 905   /* kick the queue.. */
 906   startqueuedscans();
 907 }
 908
 909 int proxyscandosave(void *sender, int cargc, char **cargv) {
 910   nick *np = (nick *)sender;
 911
 912   sendnoticetouser(proxyscannick,np,"Saving cached hosts...");
 913   dumpcachehosts(NULL);
 914   sendnoticetouser(proxyscannick,np,"Done.");
 915   return CMD_OK;
 916 }
 917
 918 int proxyscandospew(void *sender, int cargc, char **cargv) {
 919   nick *np = (nick *)sender;
 920
 921   /* check our database for the ip supplied */
 922   unsigned long a,b,c,d;
 923   if (4 != sscanf(cargv[0],"%lu.%lu.%lu.%lu",&a,&b,&c,&d)) {
 924     sendnoticetouser(proxyscannick,np,"Usage: spew x.x.x.x");
 925   } else {
 926     /* check db */
 927     proxyscanspewip(proxyscannick,np,a,b,c,d);
 928   }
 929   return CMD_OK;
 930 }
 931
 932 int proxyscandoshowkill(void *sender, int cargc, char **cargv) {
 933   nick *np = (nick *)sender;
 934
 935   /* check our database for the id supplied */
 936   unsigned long a;
 937   if (1 != sscanf(cargv[0],"%lu",&a)) {
 938     sendnoticetouser(proxyscannick,np,"Usage: showkill <id>");
 939   } else {
 940     /* check db */
 941     proxyscanshowkill(proxyscannick,np,a);
 942   }
 943   return CMD_OK;
 944 }
 945
 946 int proxyscandoscan(void *sender, int cargc, char **cargv) {
 947   nick *np = (nick *)sender;
 948   patricia_node_t *node;
 949   struct irc_in_addr sin;
 950   unsigned char bits;
 951   int i;
 952
 953   if (0 == ipmask_parse(cargv[0],&sin, &bits)) {
 954     sendnoticetouser(proxyscannick,np,"Usage: scan <ip>");
 955   } else {
 956     sendnoticetouser(proxyscannick,np,"Forcing scan of %s",IPtostr(sin));
 957     // * Just queue the scans directly here.. plonk them on the priority queue * /
 958     node = refnode(iptree, &sin, bits); /* node leaks node here - should only allow to scan a nick? */
 959     for(i=0;i<numscans;i++) {
 960       /* @@@TODO: we allow a forced scan to scan the same IP multiple times atm */
 961       queuescan(node,thescans[i].type,thescans[i].port,SCLASS_NORMAL,time(NULL));
 962     }
 963   }
 964   return CMD_OK;
 965 }
 966
 967 int proxyscandoaddscan(void *sender, int cargc, char **cargv) {
 968   nick *np = (nick *)sender;
 969
 970   unsigned int a,b;
 971   if (sscanf(cargv[0],"%u %u",&a,&b) != 2) {
 972     sendnoticetouser(proxyscannick,np,"Usage: addscan <type> <port>");
 973   } else {
 974     sendnoticetouser(proxyscannick,np,"Added scan type %u port %u",a,b);
 975     proxyscan_addscantype(a,b);
 976     scanall(a,b);
 977   }
 978   return CMD_OK;
 979 }
 980
 981 int proxyscandodelscan(void *sender, int cargc, char **cargv) {
 982   nick *np = (nick *)sender;
 983
 984   unsigned int a,b;
 985   if (sscanf(cargv[0],"%u %u",&a,&b) != 2) {
 986     sendnoticetouser(proxyscannick,np,"Usage: delscan <type> <port>");
 987   } else {
 988     sendnoticetouser(proxyscannick,np,"Delete scan type %u port %u",a,b);
 989     proxyscan_delscantype(a,b);
 990   }
 991   return CMD_OK;
 992 }
 993
 994 int proxyscandoshowcommands(void *sender, int cargc, char **cargv) {
 995   nick *np = (nick *)sender;
 996   Command *cmdlist[100];
 997   int i,n;
 998
 999   n=getcommandlist(ps_commands,cmdlist,100);
1000
1001   sendnoticetouser(proxyscannick,np,"The following commands are registered at present:");
1002   for(i=0;i<n;i++) {
1003     sendnoticetouser(proxyscannick,np,"%s",cmdlist[i]->command->content);
1004   }
1005   sendnoticetouser(proxyscannick,np,"End of list.");
1006   return CMD_OK;
1007 }