vde-2/wirefilter.c

   1 /* WIREFILTER (C) 2005 Renzo Davoli
   2  * Licensed under the GPLv2
   3  * Modified by Ludovico Gardenghi 2005
   4  *
   5  * This filter can be used for testing network protcols.
   6  * It is possible to loose, delay or reorder packets.
   7  * Options can be set on command line or interactively with a remote interface
   8  * on a unix socket (see unixterm).
   9  */
  10
  11 #include <stdio.h>
  12 #include <unistd.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <getopt.h>
  16 #include <errno.h>
  17 #include <libgen.h>
  18 #include <fcntl.h>
  19 #include <time.h>
  20 #include <signal.h>
  21 #include <stdarg.h>
  22 #include <sys/time.h>
  23 #include <sys/poll.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <sys/socket.h>
  27 #include <sys/un.h>
  28 #include <config.h>
  29
  30 #include <vde.h>
  31
  32 #define NPIPES 2
  33 #define MAXCONN 3
  34 #define STDIN_ALTFILENO 3
  35 #define STDOUT_ALTFILENO 4
  36 #define NPFD NPIPES+MAXCONN+1
  37 struct pollfd pfd[NPFD];
  38 int outfd[NPIPES];
  39 char *progname;
  40 char *mgmt;
  41 int mgmtmode=0700;
  42 #define LR 0
  43 #define RL 1
  44 double loss[2],lossplus[2];
  45 double delay[2],delayplus[2];
  46 double ddup[2],ddupplus[2];
  47 double band[2],bandplus[2];
  48 double speed[2],speedplus[2];
  49 double capacity[2],capacityplus[2];
  50 double noise[2],noiseplus[2];
  51 double mtu[2],mtuplus[2];
  52 struct timeval nextband[2];
  53 struct timeval nextspeed[2];
  54 int nofifo;
  55 int ndirs;
  56 int bufsize[2];
  57
  58 #define BUFSIZE 2048
  59 #define MAXCMD 128
  60 #define MGMTMODEARG 129
  61 #define KILO (1<<10)
  62 #define MEGA (1<<20)
  63 #define GIGA (1<<30)
  64
  65 static void readdualvalue(char *s,double *val,double *valplus)
  66 {
  67         double v=0.0;
  68         double vplus=0.0;
  69         int n;
  70         int mult;
  71         n=strlen(s)-1;
  72         while ((s[n] == ' ' || s[n] == '\n' || s[n] == '\t') && n>0)
  73         {
  74                 s[n]=0;
  75                 n--;
  76         }
  77         switch (s[n]) {
  78                 case 'k':
  79                 case 'K':
  80                         mult=KILO;
  81                         break;
  82                 case 'm':
  83                 case 'M':
  84                         mult=MEGA;
  85                         break;
  86                 case 'g':
  87                 case 'G':
  88                         mult=GIGA;
  89                         break;
  90                 default:
  91                         mult=1;
  92                         break;
  93         }
  94         if ((n=sscanf(s,"%lf+%lf",&v,&vplus)) > 0) {
  95                 val[LR]=val[RL]=v*mult;
  96                 valplus[LR]=valplus[RL]=vplus*mult;
  97         } else if ((n=sscanf(s,"LR%lf+%lf",&v,&vplus)) > 0) {
  98                 val[LR]=v*mult;
  99                 valplus[LR]=vplus*mult;
 100         } else if ((n=sscanf(s,"RL%lf+%lf",&v,&vplus)) > 0) {
 101                 val[RL]=v*mult;
 102                 valplus[RL]=vplus*mult;
 103         }
 104 }
 105
 106 struct packpq {
 107         unsigned long long when;
 108         int dir;
 109         unsigned char *buf;
 110         int size;
 111 };
 112
 113 struct packpq **pqh;
 114 struct packpq sentinel={0,0,NULL,0};
 115 int npq,maxpq;
 116 unsigned long long maxwhen;
 117
 118 #define PQCHUNK 100
 119
 120 static int nextms()
 121 {
 122         if (npq>0) {
 123                 long long deltat;
 124                 struct timeval v;
 125                 gettimeofday(&v,NULL);
 126                 deltat=pqh[1]->when-(v.tv_sec*1000000+v.tv_usec);
 127                 return (deltat>0)?(int)(deltat/1000):0;
 128         }
 129         return -1;
 130 }
 131
 132 int writepacket(int dir,const unsigned char *buf,int size)
 133 {
 134         /* NOISE */
 135         if (noise[dir]+noiseplus[dir] > 0) {
 136                 double noiseval=noise[dir];
 137                 int nobit=0;
 138                 if (noiseplus) noiseval+=((drand48()*2.0)-1.0)*noiseplus[dir];
 139                 while ((drand48()*8*MEGA) < (size-2)*8*noiseval)
 140                         nobit++;
 141                 if (nobit>0) {
 142                         unsigned char noisedpacket[BUFSIZE];
 143                         memcpy(noisedpacket,buf,size);
 144                         while(nobit>0) {
 145                                 int flippedbit=(drand48()*size*8);
 146                                 noisedpacket[(flippedbit >> 3) + 2] ^= 1<<(flippedbit & 0x7);
 147                                 nobit--;
 148                         }
 149                         return write(outfd[dir],noisedpacket,size);
 150                 } else
 151                         return write(outfd[dir],buf,size);
 152         } else
 153                 return write(outfd[dir],buf,size);
 154 }
 155
 156 /* packet queues are priority queues implemented on a heap.
 157  * enqueue time = dequeue time = O(log n) max&mean
 158  */
 159
 160 static void packet_dequeue()
 161 {
 162         struct timeval v;
 163         gettimeofday(&v,NULL);
 164         unsigned long long now=v.tv_sec*1000000+v.tv_usec;
 165         while (npq>0 && pqh[1]->when <= now) {
 166                 struct packpq *old=pqh[npq--];
 167                 int k=1;
 168                 bufsize[pqh[1]->dir] -= pqh[1]->size;
 169                 writepacket(pqh[1]->dir,pqh[1]->buf,pqh[1]->size);
 170                 free(pqh[1]->buf);
 171                 free(pqh[1]);
 172                 while (k<= npq>>1)
 173                 {
 174                         int j= k<<1;
 175                         if (j<npq && pqh[j]->when > pqh[j+1]->when) j++;
 176                         if (old->when <= pqh[j]->when) {
 177                                 break;
 178                         } else {
 179                                 pqh[k]=pqh[j];k=j;
 180                         }
 181                 }
 182                 pqh[k]=old;
 183         }
 184 }
 185
 186 static void packet_enqueue(int dir,const unsigned char *buf,int size,int delms)
 187 {
 188         struct timeval v;
 189
 190         /* CAPACITY */
 191         if (capacity[dir]+capacityplus[dir] > 0) {
 192                 double capval=capacity[dir];
 193                 if (capacityplus[dir])
 194                         capval+=((drand48()*2.0)-1.0)*capacityplus[dir];
 195                 if ((bufsize[dir]+size) > capval)
 196                         return;
 197         }
 198         /* */
 199
 200         struct packpq *new=malloc(sizeof(struct packpq));
 201         if (new==NULL) {
 202                 fprintf(stderr,"%s: malloc elem %s\n",progname,strerror(errno));
 203                 exit (1);
 204         }
 205         gettimeofday(&v,NULL);
 206         new->when=v.tv_sec * 1000000 + v.tv_usec + delms * 1000;
 207         if (new->when > maxwhen) maxwhen=new->when;
 208         if (!nofifo && new->when < maxwhen) new->when=maxwhen;
 209         new->dir=dir;
 210         new->buf=malloc(size);
 211         if (new->buf==NULL) {
 212                 fprintf(stderr,"%s: malloc elem buf %s\n",progname,strerror(errno));
 213                 exit (1);
 214         }
 215         memcpy(new->buf,buf,size);
 216         new->size=size;
 217         bufsize[dir]+=size;
 218         if (pqh==NULL) {
 219                 pqh=malloc(PQCHUNK*sizeof(struct packpq *));
 220                 if (pqh==NULL) {
 221                         fprintf(stderr,"%s: malloc %s\n",progname,strerror(errno));
 222                         exit (1);
 223                 }
 224                 pqh[0]=&sentinel; maxpq=PQCHUNK;
 225         }
 226         if (npq >= maxpq) {
 227                 pqh=realloc(pqh,(maxpq=maxpq+PQCHUNK) * sizeof(struct packpq *));
 228                 if (pqh==NULL) {
 229                         fprintf(stderr,"%s: malloc %s\n",progname,strerror(errno));
 230                         exit (1);
 231                 }
 232         }
 233         {int k=++npq;
 234                 while (new->when < pqh[k>>1]->when) {
 235                         pqh[k]=pqh[k>>1];
 236                         k >>= 1;
 237                 }
 238                 pqh[k]=new;
 239         }
 240 }
 241
 242 void handle_packet(int dir,const unsigned char *buf,int size)
 243 {
 244         /* MTU */
 245         if (mtu[dir] > 0 && size > mtu[dir])
 246                 return;
 247
 248         /* LOSS */
 249         if (loss[dir]-lossplus[dir] >= 100.0)
 250                 return;
 251         if (loss[dir]+lossplus[dir] > 0) {
 252                 double losval=(loss[dir]+((drand48()*2.0)-1.0)*lossplus[dir])/100;
 253                 if (drand48() < losval)
 254                         return;
 255         }
 256
 257         /* DUP */
 258         int times=1;
 259         if (ddup[dir]+ddupplus[dir] > 0) {
 260                 double dupval=(ddup[dir]+((drand48()*2.0)-1.0)*ddupplus[dir])/100;
 261                 while (drand48() < dupval)
 262                         times++;
 263         }
 264         while (times>0) {
 265                 /* SPEED */
 266                 if (speed[dir]+speedplus[dir] > 0) {
 267                         double speedval=speed[dir];
 268                         if (speedplus[dir]) {
 269                                 speedval+=((drand48()*2.0)-1.0)*speedplus[dir];
 270                                 if (speedval<=0) return;
 271                         }
 272                         if (speed>0) {
 273                                 unsigned int commtime=4*(((unsigned)size)*2000000/((unsigned int)speedval));
 274                                 struct timeval tv;
 275                                 gettimeofday(&tv,NULL);
 276                                 if (timercmp(&tv,&nextspeed[dir], > ))
 277                                         nextspeed[dir]=tv;
 278                                 nextspeed[dir].tv_usec += commtime;
 279                                 nextspeed[dir].tv_sec += nextspeed[dir].tv_usec / 1000000;
 280                                 nextspeed[dir].tv_usec %= 1000000;
 281                         }
 282                 }
 283
 284                 /* BANDWIDTH */
 285                 int banddelay=0;
 286                 if (band[dir]+bandplus[dir] > 0) {
 287                         double bandval=band[dir];
 288                         if (bandplus[dir]) {
 289                                 bandval+=((drand48()*2.0)-1.0)*bandplus[dir];
 290                                 if (bandval<=0) return;
 291                         }
 292                         if (band>0) {
 293                                 unsigned int commtime=4*(((unsigned)size)*2000000/((unsigned int)bandval));
 294                                 struct timeval tv;
 295                                 gettimeofday(&tv,NULL);
 296                                 if (timercmp(&tv,&nextband[dir], > )) {
 297                                         nextband[dir]=tv;
 298                                         banddelay=commtime/1000;
 299                                 } else {
 300                                         timersub(&nextband[dir],&tv,&tv);
 301                                         banddelay=tv.tv_sec*1000 + (tv.tv_usec + commtime)/1000;
 302                                 }
 303                                 nextband[dir].tv_usec += commtime;
 304                                 nextband[dir].tv_sec += nextband[dir].tv_usec / 1000000;
 305                                 nextband[dir].tv_usec %= 1000000;
 306                         } else
 307                                 banddelay=-1;
 308                 }
 309
 310                 /* DELAY */
 311                 if (banddelay >= 0) {
 312                         if (banddelay > 0 || delay[dir]+delayplus[dir] > 0) {
 313                                 double delval=(delay[dir]+((drand48()*2.0)-1.0)*delayplus[dir]);
 314                                 delval=(delval >= 0)?delval+banddelay:banddelay;
 315                                 if (delval > 0) {
 316                                         packet_enqueue(dir,buf,size,(int) delval);
 317                                 } else
 318                                         writepacket(dir,buf,size);
 319                         } else
 320                                 writepacket(dir,buf,size);
 321                 }
 322                 times--;
 323         }
 324 }
 325
 326 #define MIN(X,Y) (((X)<(Y))?(X):(Y))
 327
 328 static void splitpacket(const unsigned char *buf,int size,int dir)
 329 {
 330         static unsigned char fragment[BUFSIZE];
 331         static unsigned char *fragp;
 332         static unsigned int rnx,remaining;
 333
 334         //fprintf(stderr,"%s: splitpacket rnx=%d remaining=%d size=%d\n",myname,rnx,remaining,size);
 335         if (size==0) return;
 336         if (rnx>0) {
 337                 register int amount=MIN(remaining,size);
 338                 //fprintf(stderr,"%s: fragment amount %d\n",myname,amount);
 339                 memcpy(fragp,buf,amount);
 340                 remaining-=amount;
 341                 fragp+=amount;
 342                 buf+=amount;
 343                 size-=amount;
 344                 if (remaining==0) {
 345                         //fprintf(stderr,"%s: delivered defrag %d\n",myname,rnx);
 346                         handle_packet(dir,fragment,rnx+2);
 347                         rnx=0;
 348                 }
 349         }
 350         while (size > 0) {
 351                 rnx=(buf[0]<<8)+buf[1];
 352                 //fprintf(stderr,"%s: packet %d size %d %x %x dir %d\n",progname,rnx,size-2,buf[0],buf[1],dir);
 353                 if (rnx>1521) {
 354                         fprintf(stderr,"%s: Packet length error size %d rnx %d\n",progname,size,rnx);
 355                         rnx=0;
 356                         return;
 357                 }
 358                 if (rnx+2 > size) {
 359                         //fprintf(stderr,"%s: begin defrag %d\n",myname,rnx);
 360                         fragp=fragment;
 361                         memcpy(fragp,buf,size);
 362                         remaining=rnx+2-size;
 363                         fragp+=size;
 364                         size=0;
 365                 } else {
 366                         handle_packet(dir,buf,rnx+2);
 367                         buf+=rnx+2;
 368                         size-=rnx+2;
 369                         rnx=0;
 370                 }
 371         }
 372 }
 373
 374 static void packet_in(int dir)
 375 {
 376         unsigned char buf[BUFSIZE];
 377         int n;
 378         n=read(pfd[dir].fd,buf,BUFSIZE);
 379         if (n == 0)
 380                 exit (0);
 381         splitpacket(buf,n,dir);
 382 }
 383
 384 static void initrand()
 385 {
 386         struct timeval v;
 387         gettimeofday(&v,NULL);
 388         srand48(v.tv_sec ^ v.tv_usec ^ getpid());
 389 }
 390
 391 static int check_open_fifos(struct pollfd *pfd,int *outfd)
 392 {
 393         int ndirs;
 394         struct stat stfd[NPIPES];
 395         if (fstat(STDIN_FILENO,&stfd[STDIN_FILENO]) < 0) {
 396                 fprintf(stderr,"%s: Error on stdin: %s\n",progname,strerror(errno));
 397                 exit(1);
 398         }
 399         if (fstat(STDOUT_FILENO,&stfd[STDOUT_FILENO]) < 0) {
 400                 fprintf(stderr,"%s: Error on stdout: %s\n",progname,strerror(errno));
 401                 exit(1);
 402         }
 403         if (!S_ISFIFO(stfd[STDIN_FILENO].st_mode)) {
 404                 fprintf(stderr,"%s: Error on stdin: %s\n",progname,"it is not a pipe");
 405                 exit(1);
 406         }
 407         if (!S_ISFIFO(stfd[STDOUT_FILENO].st_mode)) {
 408                 fprintf(stderr,"%s: Error on stdin: %s\n",progname,"it is not a pipe");
 409                 exit(1);
 410         }
 411         if (fstat(STDIN_ALTFILENO,&stfd[0]) < 0) {
 412                 ndirs=1;
 413                 pfd[0].fd=STDIN_FILENO;
 414                 pfd[0].events=POLLIN | POLLHUP;
 415                 pfd[0].revents=0;
 416                 outfd[0]=STDOUT_FILENO;
 417         } else {
 418                 if (fstat(outfd[1],&stfd[1]) < 0) {
 419                         fprintf(stderr,"%s: Error on secondary out: %s\n",progname,strerror(errno));
 420                         exit(1);
 421                 }
 422                 if (!S_ISFIFO(stfd[0].st_mode)) {
 423                         fprintf(stderr,"%s: Error on secondary in: %s\n",progname,"it is not a pipe");
 424                         exit(1);
 425                 }
 426                 if (!S_ISFIFO(stfd[1].st_mode)) {
 427                         fprintf(stderr,"%s: Error on secondary out: %s\n",progname,"it is not a pipe");
 428                         exit(1);
 429                 }
 430                 ndirs=2;
 431                 pfd[LR].fd=STDIN_FILENO;
 432                 pfd[LR].events=POLLIN | POLLHUP;
 433                 pfd[LR].revents=0;
 434                 outfd[LR]=STDOUT_ALTFILENO;
 435                 pfd[RL].fd=STDIN_ALTFILENO;
 436                 pfd[RL].events=POLLIN | POLLHUP;
 437                 pfd[RL].revents=0;
 438                 outfd[RL]=STDOUT_FILENO;
 439         }
 440         return ndirs;
 441 }
 442
 443 static void cleanup(void)
 444 {
 445         if (mgmt)
 446                 unlink(mgmt);
 447 }
 448
 449 static void sig_handler(int sig)
 450 {
 451         /*fprintf(stderr,"Caught signal %d, cleaning up and exiting", sig);*/
 452         cleanup();
 453         signal(sig, SIG_DFL);
 454         kill(getpid(), sig);
 455 }
 456
 457 static void setsighandlers()
 458 {
 459         /* setting signal handlers.
 460          *    *      * sets clean termination for SIGHUP, SIGINT and SIGTERM, and simply
 461          *       *           * ignores all the others signals which could cause termination. */
 462         struct { int sig; const char *name; int ignore; } signals[] = {
 463                 { SIGHUP, "SIGHUP", 0 },
 464                 { SIGINT, "SIGINT", 0 },
 465                 { SIGPIPE, "SIGPIPE", 1 },
 466                 { SIGALRM, "SIGALRM", 1 },
 467                 { SIGTERM, "SIGTERM", 0 },
 468                 { SIGUSR1, "SIGUSR1", 1 },
 469                 { SIGUSR2, "SIGUSR2", 1 },
 470                 { SIGPROF, "SIGPROF", 1 },
 471                 { SIGVTALRM, "SIGVTALRM", 1 },
 472 #ifdef VDE_LINUX
 473                 { SIGPOLL, "SIGPOLL", 1 },
 474                 { SIGSTKFLT, "SIGSTKFLT", 1 },
 475                 { SIGIO, "SIGIO", 1 },
 476                 { SIGPWR, "SIGPWR", 1 },
 477                 { SIGUNUSED, "SIGUNUSED", 1 },
 478 #endif
 479 #ifdef VDE_DARWIN
 480                 { SIGXCPU, "SIGXCPU", 1 },
 481                 { SIGXFSZ, "SIGXFSZ", 1 },
 482 #endif
 483                 { 0, NULL, 0 }
 484         };
 485
 486         int i;
 487         for(i = 0; signals[i].sig != 0; i++)
 488                 if(signal(signals[i].sig,
 489                                         signals[i].ignore ? SIG_IGN : sig_handler) < 0)
 490                         fprintf(stderr,"%s: Setting handler for %s: %s", progname, signals[i].name,
 491                                         strerror(errno));
 492 }
 493
 494 static int openmgmt(char *mgmt)
 495 {
 496         int mgmtconnfd;
 497         struct sockaddr_un sun;
 498         int one = 1;
 499
 500         if((mgmtconnfd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0){
 501                 fprintf(stderr,"%s: mgmt socket: %s",progname,strerror(errno));
 502                 exit(1);
 503         }
 504         if(setsockopt(mgmtconnfd, SOL_SOCKET, SO_REUSEADDR, (char *) &one,
 505                                 sizeof(one)) < 0){
 506                 fprintf(stderr,"%s: mgmt setsockopt: %s",progname,strerror(errno));
 507                 exit(1);
 508         }
 509         if(fcntl(mgmtconnfd, F_SETFL, O_NONBLOCK) < 0){
 510                 fprintf(stderr,"%s: Setting O_NONBLOCK on mgmt fd: %s",progname,strerror(errno));
 511                 exit(1);
 512         }
 513         sun.sun_family = PF_UNIX;
 514         snprintf(sun.sun_path,sizeof(sun.sun_path),"%s",mgmt);
 515         if(bind(mgmtconnfd, (struct sockaddr *) &sun, sizeof(sun)) < 0){
 516                 fprintf(stderr,"%s: mgmt bind %s",progname,strerror(errno));
 517                 exit(1);
 518         }
 519         chmod(sun.sun_path,mgmtmode);
 520         if(listen(mgmtconnfd, 15) < 0){
 521                 fprintf(stderr,"%s: mgmt listen: %s",progname,strerror(errno));
 522                 exit(1);
 523         }
 524         return mgmtconnfd;
 525 }
 526
 527 static char header[]="\nVDE wirefilter V.%s\n(C) R.Davoli 2005 - GPLv2\n";
 528 static char prompt[]="\nVDEwf:";
 529 static int newmgmtconn(int fd,struct pollfd *pfd,int nfds)
 530 {
 531         int new;
 532         unsigned int len;
 533         char buf[MAXCMD];
 534         struct sockaddr addr;
 535         new = accept(fd, &addr, &len);
 536         if(new < 0){
 537                 fprintf(stderr,"%s: mgmt accept %s",progname,strerror(errno));
 538                 return nfds;
 539         }
 540         if (nfds < NPFD) {
 541                 snprintf(buf,MAXCMD,header,PACKAGE_VERSION);
 542                 write(new,buf,strlen(buf));
 543                 write(new,prompt,strlen(prompt));
 544                 pfd[nfds].fd=new;
 545                 pfd[nfds].events=POLLIN | POLLHUP;
 546                 pfd[nfds].revents=0;
 547                 return ++nfds;
 548         } else {
 549                 fprintf(stderr,"%s: too many mgmt connections",progname);
 550                 close (new);
 551                 return nfds;
 552         }
 553 }
 554
 555 static void printoutc(int fd, const char *format, ...)
 556 {
 557         va_list arg;
 558         char outbuf[MAXCMD+1];
 559
 560         va_start (arg, format);
 561         vsnprintf(outbuf,MAXCMD,format,arg);
 562         strcat(outbuf,"\n");
 563         write(fd,outbuf,strlen(outbuf));
 564 }
 565
 566 static int setdelay(int fd,char *s)
 567 {
 568         readdualvalue(s,delay,delayplus);
 569         return 0;
 570 }
 571
 572 static int setloss(int fd,char *s)
 573 {
 574         readdualvalue(s,loss,lossplus);
 575         return 0;
 576 }
 577
 578 static int setddup(int fd,char *s)
 579 {
 580         readdualvalue(s,ddup,ddupplus);
 581         return 0;
 582 }
 583
 584 static int setband(int fd,char *s)
 585 {
 586         readdualvalue(s,band,bandplus);
 587         return 0;
 588 }
 589
 590 static int setnoise(int fd,char *s)
 591 {
 592         readdualvalue(s,noise,noiseplus);
 593         return 0;
 594 }
 595
 596 static int setmtu(int fd,char *s)
 597 {
 598         readdualvalue(s,mtu,mtuplus);
 599         return 0;
 600 }
 601
 602 static int setspeed(int fd,char *s)
 603 {
 604         readdualvalue(s,speed,speedplus);
 605         return 0;
 606 }
 607
 608 static int setcapacity(int fd,char *s)
 609 {
 610         readdualvalue(s,capacity,capacityplus);
 611         return 0;
 612 }
 613
 614 static int setfifo(int fd,char *s)
 615 {
 616         int n=atoi(s);
 617         if (n==0)
 618                 nofifo=1;
 619         else
 620                 nofifo=0;
 621         return 0;
 622 }
 623
 624 static int logout(int fd,char *s)
 625 {
 626         return -1;
 627 }
 628
 629 static int doshutdown(int fd,char *s)
 630 {
 631         exit(0);
 632 }
 633
 634
 635 static int help(int fd,char *s)
 636 {
 637         printoutc(fd, "help:      print a summary of mgmt commands");
 638         printoutc(fd, "showinfo:  show status and parameter values");
 639         printoutc(fd, "loss:      set loss percentage");
 640         printoutc(fd, "delay:     set delay ms");
 641         printoutc(fd, "dup:       set dup packet percentage");
 642         printoutc(fd, "bandwidth: set channel bandwidth bytes/sec");
 643         printoutc(fd, "speed:     set interface speed bytes/sec");
 644         printoutc(fd, "noise:     set noise factor bits/Mbyte");
 645         printoutc(fd, "mtu:       set channel MTU (bytes)");
 646         printoutc(fd, "capacity:  set channel capacity (bytes)");
 647         printoutc(fd, "fifo:      set channel fifoness");
 648         printoutc(fd, "shutdown:  shut the channel down");
 649         printoutc(fd, "logout:    log out from this mgmt session");
 650         return 0;
 651 }
 652
 653 static int showinfo(int fd,char *s)
 654 {
 655         printoutc(fd, "WireFilter: %sdirectional",(ndirs==2)?"bi":"mono");
 656         if (ndirs==2) {
 657                 printoutc(fd, "Loss  L->R %g+%g   R->L %g+%g",loss[LR],lossplus[LR],loss[RL],lossplus[RL]);
 658                 printoutc(fd, "Delay L->R %g+%g   R->L %g+%g",delay[LR],delayplus[LR],delay[RL],delayplus[RL]);
 659                 printoutc(fd, "Dup   L->R %g+%g   R->L %g+%g",ddup[LR],ddupplus[LR],ddup[RL],ddupplus[RL]);
 660                 printoutc(fd, "Bandw L->R %g+%g   R->L %g+%g",band[LR],bandplus[LR],band[RL],bandplus[RL]);
 661                 printoutc(fd, "Speed L->R %g+%g   R->L %g+%g",speed[LR],speedplus[LR],speed[RL],speedplus[RL]);
 662                 printoutc(fd, "Noise L->R %g+%g   R->L %g+%g",noise[LR],noiseplus[LR],noise[RL],noiseplus[RL]);
 663                 printoutc(fd, "MTU   L->R %g      R->L %g   ",mtu[LR],mtu[RL]);
 664                 printoutc(fd, "Cap.  L->R %g+%g   R->L %g+%g",capacity[LR],capacityplus[LR],capacity[RL],capacityplus[RL]);
 665                 printoutc(fd, "Current Delay Queue size:   L->R %d      R->L %d   ",bufsize[LR],bufsize[RL]);
 666         } else {
 667                 printoutc(fd, "Loss  %g+%g",loss[0],lossplus[0]);
 668                 printoutc(fd, "Delay %g+%g",delay[0],delayplus[0]);
 669                 printoutc(fd, "Dup   %g+%g",ddup[0],ddupplus[0]);
 670                 printoutc(fd, "Bandw %g+%g",band[0],bandplus[0]);
 671                 printoutc(fd, "Speed %g+%g",speed[0],speedplus[0]);
 672                 printoutc(fd, "Noise %g+%g",noise[0],noiseplus[0]);
 673                 printoutc(fd, "MTU   %g",mtu[0]);
 674                 printoutc(fd, "Cap.  %g+%g",capacity[0],capacityplus[0]);
 675                 printoutc(fd, "Current Delay Queue size:   %d",bufsize[0]);
 676         }
 677         printoutc(fd,"Fifoness %s",(nofifo == 0)?"TRUE":"FALSE");
 678         printoutc(fd,"Waiting packets in delay queues %d",npq);
 679         return 0;
 680 }
 681
 682 static struct comlist {
 683         char *tag;
 684         int (*fun)(int fd,char *arg);
 685 } commandlist [] = {
 686         {"help", help},
 687         {"showinfo",showinfo},
 688         {"delay",setdelay},
 689         {"loss",setloss},
 690         {"dup",setddup},
 691         {"bandwidth",setband},
 692         {"band",setband},
 693         {"speed",setspeed},
 694         {"capacity",setcapacity},
 695         {"noise",setnoise},
 696         {"mtu",setmtu},
 697         {"fifo",setfifo},
 698         {"logout",logout},
 699         {"shutdown",doshutdown}
 700 };
 701
 702 #define NCL sizeof(commandlist)/sizeof(struct comlist)
 703
 704 static int handle_cmd(int fd,char *inbuf)
 705 {
 706         int rv=ENOSYS;
 707         int i;
 708         while (*inbuf == ' ' || *inbuf == '\t') inbuf++;
 709         if (*inbuf != '\0' && *inbuf != '#') {
 710                 for (i=0; i<NCL
 711                                 && strncmp(commandlist[i].tag,inbuf,strlen(commandlist[i].tag))!=0;
 712                                 i++)
 713                         ;
 714                 if (i<NCL)
 715                 {
 716                         inbuf += strlen(commandlist[i].tag);
 717                         while (*inbuf == ' ' || *inbuf == '\t') inbuf++;
 718                         rv=commandlist[i].fun(fd,inbuf);
 719                 }
 720                 printoutc(fd,"1%03d %s",rv,strerror(rv));
 721                 return rv;
 722         }
 723         return rv;
 724 }
 725
 726 static int mgmtcommand(int fd)
 727 {
 728         char buf[MAXCMD+1];
 729         int n,rv;
 730         n = read(fd, buf, MAXCMD);
 731         if (n<0) {
 732                 fprintf(stderr,"%s: read from mgmt %s",progname,strerror(errno));
 733                 return 0;
 734         }
 735         else if (n==0)
 736                 return -1;
 737         else {
 738                 buf[n]=0;
 739                 rv=handle_cmd(fd,buf);
 740                 if (rv>=0)
 741                         write(fd,prompt,strlen(prompt));
 742                 return rv;
 743         }
 744 }
 745
 746 static int delmgmtconn(int i,struct pollfd *pfd,int nfds)
 747 {
 748         if (i<nfds) {
 749                 close(pfd[i].fd);
 750                 memmove(pfd+i,pfd+i+1,sizeof (struct pollfd) * (nfds-i-1));
 751                 nfds--;
 752         }
 753         return nfds;
 754 }
 755
 756 void usage(void)
 757 {
 758         fprintf(stderr,"Usage: %s OPTIONS\n"
 759                 "\t--help|-h\n"
 760                 "\t--loss|-l loss_percentage\n"
 761                 "\t--delay|-d delay_ms\n"
 762                 "\t--dup|-D dup_percentage\n"
 763                 "\t--band|-b bandwidth\n"
 764                 "\t--speed|-s interface_speed\n"
 765                 "\t--capacity|-c delay_channel_capacity\n"
 766                 "\t--noise|-n noise_bits/megabye\n"
 767                 "\t--mtu|-m\n mtu_size"
 768                 "\t--nofifo|-N\n"
 769                 "\t--mgmt|-M management_socket\n"
 770                 "\t--mgmtmode management_permission(octal)\n"
 771                         ,progname);
 772         exit (1);
 773 }
 774
 775 int main(int argc,char *argv[])
 776 {
 777         int n;
 778         int npfd;
 779         int option_index;
 780         int mgmtindex=-1;
 781         static struct option long_options[] = {
 782                 {"help",0 , 0, 'h'},
 783                 {"loss", 1, 0, 'l'},
 784                 {"delay",1 , 0, 'd'},
 785                 {"dup",1 , 0, 'D'},
 786                 {"band",1 , 0, 'b'},
 787                 {"speed",1 , 0, 's'},
 788                 {"capacity",1 , 0, 'c'},
 789                 {"noise",1 , 0, 'n'},
 790                 {"mtu",1 , 0, 'm'},
 791                 {"nofifo",0 , 0, 'N'},
 792                 {"mgmt", 1, 0, 'M'},
 793                 {"mgmtmode", 1, 0, MGMTMODEARG}
 794         };
 795         progname=basename(argv[0]);
 796
 797         setsighandlers();
 798         atexit(cleanup);
 799
 800         ndirs=check_open_fifos(pfd,outfd);
 801
 802         while(1) {
 803                 int c;
 804                 c = GETOPT_LONG (argc, argv, "hnl:d:M:D:m:b:s:c:",
 805                                 long_options, &option_index);
 806                 if (c<0)
 807                         break;
 808                 switch (c) {
 809                         case 'h':
 810                                 usage();
 811                                 break;
 812                         case 'd':
 813                                 readdualvalue(optarg,delay,delayplus);
 814                                 break;
 815                         case 'l':
 816                                 readdualvalue(optarg,loss,lossplus);
 817                                 break;
 818                         case 'D':
 819                                 readdualvalue(optarg,ddup,ddupplus);
 820                                 break;
 821                         case 'b':
 822                                 readdualvalue(optarg,band,bandplus);
 823                                 break;
 824                         case 'm':
 825                                 readdualvalue(optarg,mtu,mtuplus);
 826                                 break;
 827                         case 'n':
 828                                 readdualvalue(optarg,noise,noiseplus);
 829                                 break;
 830                         case 's':
 831                                 readdualvalue(optarg,speed,speedplus);
 832                                 break;
 833                         case 'c':
 834                                 readdualvalue(optarg,capacity,capacityplus);
 835                                 break;
 836                         case 'M':
 837                                 mgmt=strdup(optarg);
 838                                 break;
 839                         case 'N':
 840                                 nofifo=1;
 841                                 break;
 842                         case MGMTMODEARG:
 843                                 sscanf(optarg,"%o",&mgmtmode);
 844                                 break;
 845                         default:
 846                                 usage();
 847                                 break;
 848                 }
 849         }
 850         if (optind < argc)
 851                 usage();
 852
 853         if (ndirs==2)
 854                 fprintf(stderr,"%s: bidirectional filter starting...\n",progname);
 855         else
 856                 fprintf(stderr,"%s: monodirectional filter starting...\n",progname);
 857
 858         npfd=ndirs;
 859
 860         if(mgmt != NULL) {
 861                 int mgmtfd=openmgmt(mgmt);
 862                 mgmtindex=npfd;
 863                 pfd[mgmtindex].fd=mgmtfd;
 864                 pfd[mgmtindex].events=POLLIN | POLLHUP;
 865                 pfd[mgmtindex].revents=0;
 866                 npfd++;
 867         }
 868
 869         initrand();
 870         while(1) {
 871                 int delay=nextms();
 872                 pfd[0].events |= POLLIN;
 873                 if (speed[LR] > 0) {
 874                         struct timeval tv;
 875                         int speeddelay;
 876                         gettimeofday(&tv,NULL);
 877                         if (timercmp(&tv, &nextspeed[LR], <)) {
 878                                 timersub(&nextspeed[LR],&tv,&tv);
 879                                 speeddelay=tv.tv_sec*1000 + tv.tv_usec/1000;
 880                                 if (speeddelay > 0) {
 881                                         pfd[0].events &= ~POLLIN;
 882                                         if (speeddelay < delay || delay < 0) delay=speeddelay;
 883                                 }
 884                         }
 885                 }
 886                 if (ndirs > 1) {
 887                         pfd[1].events |= POLLIN;
 888                         if (speed[RL] > 0) {
 889                                 struct timeval tv;
 890                                 int speeddelay;
 891                                 if (timercmp(&tv, &nextspeed[RL], <)) {
 892                                         gettimeofday(&tv,NULL);
 893                                         timersub(&nextspeed[RL],&tv,&tv);
 894                                         speeddelay=tv.tv_sec*1000 + tv.tv_usec/1000;
 895                                         if (speeddelay > 0) {
 896                                                 pfd[1].events &= ~POLLIN;
 897                                                 if (speeddelay < delay || delay < 0) delay=speeddelay;
 898                                         }
 899                                 }
 900                         }
 901                 }
 902                 n=poll(pfd,npfd,delay);
 903                 if (pfd[0].revents & POLLHUP || (ndirs>1 && pfd[1].revents & POLLHUP))
 904                         exit(0);
 905                 if (pfd[0].revents & POLLIN) {
 906                         packet_in(LR);
 907                 }
 908                 if (ndirs>1 && pfd[1].revents & POLLIN) {
 909                         packet_in(RL);
 910                 }
 911                 if (mgmtindex >= 0 && pfd[mgmtindex].revents != 0)
 912                         npfd=newmgmtconn(pfd[mgmtindex].fd,pfd,npfd);
 913                 if (npfd > mgmtindex+1) {
 914                         register int i;
 915                         for (i=mgmtindex+1;i<npfd;i++) {
 916                                 if (pfd[i].revents & POLLHUP ||
 917                                                 (pfd[i].revents & POLLIN && mgmtcommand(pfd[i].fd) < 0))
 918                                         npfd=delmgmtconn(i,pfd,npfd);
 919                         }
 920                 }
 921                 packet_dequeue();
 922         }
 923 }