vdetelweb/vdetelweb.c

   1 /*
   2  *   VDETELWEB: VDE telnet and WEB interface
   3  *
   4  *   vdetelweb.c: main
   5  *
   6  *   Copyright 2005,2008 Virtual Square Team University of Bologna - Italy
   7  *   2005 written by Renzo Davoli
   8  *   --pidfile/-p and cleanup management by Mattia Belletti (C) 2004
   9  *                            (copied from vde_switch code).
  10  *   2008 updated Renzo Davoli
  11  *   2008 sha1sum by Marco Dalla Via
  12  *
  13  *   This program is free software; you can redistribute it and/or modify
  14  *   it under the terms of the GNU General Public License as published by
  15  *   the Free Software Foundation; either version 2 of the License, or
  16  *   (at your option) any later version.
  17  *
  18  *   This program is distributed in the hope that it will be useful,
  19  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *   GNU General Public License for more details.
  22  *
  23  *   You should have received a copy of the GNU General Public License along
  24  *   with this program; if not, write to the Free Software Foundation, Inc.,
  25  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  26  *
  27  *   $Id$
  28  *
  29  */
  30 #include <config.h>
  31 #include <stdio.h>
  32 #include <signal.h>
  33 #include <stdarg.h>
  34 #include <syslog.h>
  35 #include <errno.h>
  36 #include <unistd.h>
  37 #include <netdb.h>
  38 #include <libgen.h>
  39 #include <unistd.h>
  40 #include <sys/types.h>
  41 #include <sys/socket.h>
  42 #include <sys/select.h>
  43 #include <sys/poll.h>
  44 #include <sys/wait.h>
  45 #include <sys/utsname.h>
  46 #include <linux/un.h>
  47 #include <netinet/in.h>
  48 #include <arpa/inet.h>
  49 #include <string.h>
  50 #include <getopt.h>
  51 #include <sys/stat.h>
  52 #include <fcntl.h>
  53 #include "vdetelweb.h"
  54 #include <lwipv6.h>
  55
  56 int daemonize;
  57 int telnet;
  58 int web;
  59 char *mgmt;
  60 char *banner;
  61 char *progname;
  62 char *prompt;
  63 int logok;
  64 static char *passwd;
  65 static char *pidfile = NULL;
  66 static char pidfile_path[_POSIX_PATH_MAX];
  67 struct stack *lwipstack;
  68
  69 #define MAXFD 16
  70 #define HASH_SIZE 40
  71 int npfd=0;
  72 struct pollfd pfd[MAXFD];
  73 voidfun fpfd[MAXFD];
  74 void *status[MAXFD];
  75
  76 #define ROOTCONFFILE "/etc/vde/vdetelwebrc"
  77
  78 /* This will be prefixed by getenv("HOME") */
  79 #define USERCONFFILE "/.vde/vdetelwebrc"
  80
  81 void printlog(int priority, const char *format, ...)
  82 {
  83         va_list arg;
  84
  85         va_start (arg, format);
  86
  87         if (logok)
  88                 vsyslog(priority,format,arg);
  89         else {
  90                 fprintf(stderr,"%s: ",progname);
  91                 vfprintf(stderr,format,arg);
  92                 fprintf(stderr,"\n");
  93         }
  94         va_end (arg);
  95 }
  96
  97
  98 static void cleanup(void)
  99 {
 100         if (lwipstack)
 101                 lwip_stack_free(lwipstack);
 102         if((pidfile != NULL) && unlink(pidfile_path) < 0) {
 103                 printlog(LOG_WARNING,"Couldn't remove pidfile '%s': %s", pidfile, strerror(errno));
 104         }
 105 }
 106
 107 int sha1passwdok(const char *pw) {
 108         char buf[HASH_SIZE + 1];
 109         int pfd_fc[2];
 110         int pfd_cf[2];
 111         pid_t pid;
 112
 113         pipe(pfd_fc);
 114         pipe(pfd_cf);
 115         pid = fork();
 116
 117         if (!pid) {
 118                 close(pfd_fc[1]);
 119                 close(pfd_cf[0]);
 120                 dup2(pfd_fc[0], STDIN_FILENO);
 121                 dup2(pfd_cf[1], STDOUT_FILENO);
 122
 123                 execl("/usr/bin/sha1sum", "/usr/bin/sha1sum", NULL);
 124                 exit(1);
 125         } else {
 126                 close(pfd_cf[1]);
 127                 close(pfd_fc[0]);
 128
 129                 write(pfd_fc[1], pw, strlen(pw));
 130                 close(pfd_fc[1]);
 131                 read(pfd_cf[0], buf, sizeof(buf));
 132                 close(pfd_cf[0]);
 133
 134                 waitpid(pid, NULL, 0);
 135                 return (strncmp(buf,passwd,strlen(passwd))==0);
 136         }
 137 }
 138
 139 static void sig_handler(int sig)
 140 {
 141         cleanup();
 142         signal(sig, SIG_DFL);
 143         kill(getpid(), sig);
 144 }
 145
 146 static void setsighandlers(void)
 147 {
 148         /* setting signal handlers.
 149          *    * sets clean termination for SIGHUP, SIGINT and SIGTERM, and simply
 150          *       * ignores all the others signals which could cause termination. */
 151         struct { int sig; const char *name; int ignore; } signals[] = {
 152                 { SIGHUP, "SIGHUP", 0 },
 153                 { SIGINT, "SIGINT", 0 },
 154                 { SIGPIPE, "SIGPIPE", 1 },
 155                 { SIGALRM, "SIGALRM", 1 },
 156                 { SIGTERM, "SIGTERM", 0 },
 157                 { SIGUSR1, "SIGUSR1", 1 },
 158                 { SIGUSR2, "SIGUSR2", 1 },
 159                 { SIGPOLL, "SIGPOLL", 1 },
 160                 { SIGPROF, "SIGPROF", 1 },
 161                 { SIGVTALRM, "SIGVTALRM", 1 },
 162                 { SIGSTKFLT, "SIGSTKFLT", 1 },
 163                 { SIGIO, "SIGIO", 1 },
 164                 { SIGPWR, "SIGPWR", 1 },
 165                 { SIGUNUSED, "SIGUNUSED", 1 },
 166                 { 0, NULL, 0 }
 167         };
 168
 169         int i;
 170         for(i = 0; signals[i].sig != 0; i++)
 171                 if(signal(signals[i].sig,
 172                                         signals[i].ignore ? SIG_IGN : sig_handler) < 0)
 173                         perror("Setting handler");
 174 }
 175
 176 static void usage(char *progname) {
 177         fprintf (stderr,"Usage: %s [-w] [-t] [-d] [-n nodename] [-p pidfile] mgmt_socket\n"
 178                         "       %s [--web] [--telnet] [--daemon] [--nodename nodename] [--pidfile pidfile] mgmt_socket\n",progname,progname);
 179         exit(-1);
 180 }
 181
 182 void setprompt(char *ctrl,char *nodename)
 183 {
 184         char buf[BUFSIZE];
 185         if (nodename==NULL) {
 186                 struct utsname un;
 187                 uname(&un);
 188                 snprintf(buf,BUFSIZE,"VDE2@%s[%s]: ",un.nodename,ctrl);
 189         } else
 190                 snprintf(buf,BUFSIZE,"VDE2@%s[%s]: ",nodename,ctrl);
 191         prompt=strdup(buf);
 192 }
 193
 194 int openextravdem(void)
 195 {
 196         struct sockaddr_un sun;
 197         int fd,n;
 198         char buf[BUFSIZE+1];
 199         sun.sun_family=PF_UNIX;
 200         snprintf(sun.sun_path,UNIX_PATH_MAX,"%s",mgmt);
 201         fd=socket(PF_UNIX,SOCK_STREAM,0);
 202         if (connect(fd,(struct sockaddr *)(&sun),sizeof(sun)) < 0) {
 203                 printlog(LOG_ERR,"Error connecting to the management socket '%s': %s", mgmt, strerror(errno));
 204                 return(-1);
 205         }
 206         if ((n=read(fd,buf,BUFSIZE))<=0) {
 207                 printlog(LOG_ERR,"banner %s",strerror(errno));
 208                 return(-1);
 209         }
 210         return fd;
 211 }
 212
 213 int openvdem(char *mgmt,char *progname, struct netif **nif,char *nodename)
 214 {
 215         struct sockaddr_un sun;
 216         int fd,n;
 217         char buf[BUFSIZE+1],*line2,*ctrl;
 218         sun.sun_family=PF_UNIX;
 219         snprintf(sun.sun_path,UNIX_PATH_MAX,"%s",mgmt);
 220         fd=socket(PF_UNIX,SOCK_STREAM,0);
 221         if (connect(fd,(struct sockaddr *)(&sun),sizeof(sun)) < 0) {
 222                 printlog(LOG_ERR,"Error connecting to the management socket '%s': %s", mgmt, strerror(errno));
 223                 exit(-1);
 224         }
 225         if ((n=read(fd,buf,BUFSIZE))<=0) {
 226                 printlog(LOG_ERR,"Error reading banner from VDE switch: %s",strerror(errno));
 227                 exit(-1);
 228         }
 229         buf[n]=0;
 230         if ((ctrl=rindex(buf,'\n')) != NULL)
 231                 *ctrl=0;
 232         banner=strdup(buf);
 233         write(fd,"ds/showinfo\n",13);
 234         if ((n=read(fd,buf,BUFSIZE))<=0) {
 235                 printlog(LOG_ERR,"Error reading ctl socket from VDE switch: %s",strerror(errno));
 236                 exit(-1);
 237         }
 238         buf[n]=0;
 239         if ((line2=index(buf,'\n')) == NULL) {
 240                 printlog(LOG_ERR,"Error parsing first line of ctl socket information");
 241                 exit(-1);
 242         }
 243         line2++;
 244         if (strncmp(line2,"ctl dir ",8) != 0) {
 245                 printlog(LOG_ERR,"Error parsing ctl socket information");
 246                 exit(-1);
 247         }
 248         for(ctrl=line2+8;*ctrl!='\n' && ctrl<buf+n;ctrl++)
 249                 ;
 250         *ctrl=0;
 251         ctrl=line2+8;
 252         setprompt(ctrl,nodename);
 253         strcat(ctrl,"[0]");
 254         *nif=lwip_vdeif_add(lwipstack,ctrl);
 255         if (*nif == NULL) {
 256                 printlog(LOG_ERR,"Cannot connect to the VDE switch");
 257                 exit(-1);
 258         }
 259         lwip_ifup(*nif);
 260
 261         return fd;
 262 }
 263
 264 static void bitno2mask(unsigned char *addr,int bitno,int len)
 265 {
 266         int i;
 267         for(i=0;i<len;i++,bitno -= 8) {
 268                 if (bitno >= 8)
 269                         addr[i]=255;
 270                 else if (bitno <= 0)
 271                         addr[i]=0;
 272                 else
 273                         addr[i]=256 - (1<<(8-bitno));
 274         }
 275 }
 276
 277 static void sockaddr2ip_6addr(struct ip_addr *ipaddrp,unsigned char *addr)
 278 {
 279         IP6_ADDR(ipaddrp,
 280                         (addr[0]<<8)|addr[1],
 281                         (addr[2]<<8)|addr[3],
 282                         (addr[4]<<8)|addr[5],
 283                         (addr[6]<<8)|addr[7],
 284                         (addr[8]<<8)|addr[9],
 285                         (addr[10]<<8)|addr[11],
 286                         (addr[12]<<8)|addr[13],
 287                         (addr[14]<<8)|addr[15]);
 288 }
 289
 290 static void readip(char *arg,struct netif *nif,int af)
 291 {
 292         char *bit=rindex(arg,'/');
 293         if (bit == 0)
 294                 printlog(LOG_ERR,"IP addresses must include the netmask i.e. addr/maskbits");
 295         else {
 296                 int bitno=atoi(bit+1);
 297                 *bit=0;
 298                 struct addrinfo *res,hint;
 299                 struct ip_addr ipaddr,netmask;
 300                 int err;
 301                 memset(&hint,0,sizeof(hint));
 302                 hint.ai_family=af;
 303                 if ((err=getaddrinfo(arg,NULL,&hint,&res))!=0)
 304                         printlog(LOG_ERR,"IP address %s error %s",arg,gai_strerror(err));
 305                 else {
 306                         switch(res->ai_family) {
 307                                 case PF_INET:
 308                                         {
 309                                                 struct sockaddr_in *in=(struct sockaddr_in *)res->ai_addr;
 310                                                 int addrh=ntohl(in->sin_addr.s_addr);
 311                                                 unsigned char i,addr[4];
 312                                                 for (i=0;i<4;i++,addrh>>=8)
 313                                                         addr[3-i]=addrh;
 314                                                 IP64_ADDR(&ipaddr, addr[0],addr[1],addr[2],addr[3]);
 315                                                 bitno2mask(addr,bitno,4);
 316                                                 IP64_MASKADDR(&netmask, addr[0],addr[1],addr[2],addr[3]);
 317                                                 lwip_add_addr(nif,&ipaddr,&netmask);
 318                                         }
 319                                         break;
 320                                 case PF_INET6:
 321                                         {
 322                                                 struct sockaddr_in6 *in=(struct sockaddr_in6 *)res->ai_addr;
 323                                                 unsigned char *addr=in->sin6_addr.s6_addr;
 324                                                 sockaddr2ip_6addr(&ipaddr,addr);
 325                                                 bitno2mask(addr,bitno,16);
 326                                                 sockaddr2ip_6addr(&netmask,addr);
 327                                                 lwip_add_addr(nif,&ipaddr,&netmask);
 328                                         }
 329                                         break;
 330                                 default:
 331                                         printlog(LOG_ERR,"Unsupported Address Family: %s",arg);
 332                         }
 333                         freeaddrinfo(res);
 334                 }
 335         }
 336 }
 337
 338 static void readdefroute(char *arg,struct netif *nif,int af)
 339 {
 340         struct addrinfo *res,hint;
 341         struct ip_addr ipaddr;
 342         int err;
 343         memset(&hint,0,sizeof(hint));
 344         hint.ai_family=af;
 345         if ((err=getaddrinfo(arg,NULL,&hint,&res))!=0)
 346                 printlog(LOG_ERR,"IP address %s error %s",arg,gai_strerror(err));
 347         else {
 348                 switch(res->ai_family) {
 349                         case PF_INET:
 350                                 {
 351                                         struct sockaddr_in *in=(struct sockaddr_in *)res->ai_addr;
 352                                         int addrh=ntohl(in->sin_addr.s_addr);
 353                                         unsigned char i,addr[4];
 354                                         for (i=0;i<4;i++,addrh>>=8)
 355                                                 addr[3-i]=addrh;
 356                                         IP64_ADDR(&ipaddr, addr[0],addr[1],addr[2],addr[3]);
 357                                         lwip_add_route(lwipstack,IP_ADDR_ANY,IP_ADDR_ANY,&ipaddr,nif,0);
 358                                 }
 359                                 break;
 360                         case PF_INET6:
 361                                 {
 362                                         struct sockaddr_in6 *in=(struct sockaddr_in6 *)res->ai_addr;
 363                                         sockaddr2ip_6addr(&ipaddr,in->sin6_addr.s6_addr);
 364                                         lwip_add_route(lwipstack,IP_ADDR_ANY,IP_ADDR_ANY,&ipaddr,nif,0);
 365                                 }
 366                                 break;
 367                         default:
 368                                 printlog(LOG_ERR,"Unsupported Address Family: %s",arg);
 369                 }
 370                 freeaddrinfo(res);
 371         }
 372 }
 373
 374 static void readpassword(char *arg,int unused)
 375 {
 376         passwd=strdup(arg);
 377 }
 378
 379 struct cf {
 380         char *tag;
 381         void (*f)();
 382         int arg;
 383 } cft[]= {
 384         {"ip4",readip,PF_INET},
 385         {"ip6",readip,PF_INET6},
 386         {"ip",readip,0},
 387         {"defroute4",readdefroute,PF_INET},
 388         {"defroute6",readdefroute,PF_INET6},
 389         {"defroute",readdefroute,0},
 390         {"password",readpassword,0},
 391         {NULL,NULL,0}};
 392
 393 int readconffile(char *path,struct netif *nif)
 394 {
 395         FILE *f;
 396         char buf[BUFSIZE],*s;
 397         int line = 0;
 398
 399         if (path==NULL)
 400                 return -1;
 401         if((f=fopen(path,"r"))==NULL)
 402                 return -1;
 403         while (fgets(buf,BUFSIZE,f) != NULL)
 404         {
 405                 line++;
 406
 407                 if ((s=rindex(buf,'\n')) != NULL)
 408                         *s=0;
 409
 410                 for(s=buf;*s == ' ' || *s == '\t';s++);
 411
 412                 if (*s != '#' && *s != '\n' && *s != '\0')
 413                 {
 414                         struct cf *scf;
 415                         for (scf=cft;scf->tag != NULL;scf++)
 416                                 if(strncmp(s,scf->tag,strlen(scf->tag)) == 0)
 417                                 {
 418                                         s+=strlen(scf->tag);
 419                                         for(;*s == ' ' || *s == '\t';s++);
 420                                         if (*s == '=')
 421                                                 s++;
 422                                         for(;*s == ' ' || *s == '\t';s++);
 423                                         scf->f(s,nif,scf->arg);
 424                                         break;
 425                                 }
 426                         if (scf->tag == NULL)
 427                                 printlog(LOG_ERR,"Error parsing configuration file: line %d: %s", line, buf);
 428                 }
 429         }
 430         return 0;
 431 }
 432
 433 int addpfd(int fd,voidfun cb)
 434 {
 435         if (npfd < MAXFD) {
 436                 pfd[npfd].fd=fd;
 437                 pfd[npfd].events=POLLIN|POLLHUP;
 438                 pfd[npfd].revents=0;
 439                 fpfd[npfd]=cb;
 440                 npfd++;
 441         }
 442         return npfd-1;
 443 }
 444
 445 void delpfd(int fn)
 446 {
 447         int i=fn;
 448         for (i=fn;i<npfd-1;i++) {
 449                 pfd[i]=pfd[i+1];
 450                 fpfd[i]=fpfd[i+1];
 451                 status[i]=status[i+1];
 452         }
 453         npfd--;
 454 }
 455
 456 int pfdsearch(int fd)
 457 {
 458         int i;
 459         for (i=0;i<npfd && pfd[i].fd!=fd;i++)
 460                 ;
 461         return i;
 462 }
 463
 464 int setfds(fd_set *rds, fd_set *exc)
 465 {
 466         int i,max=0;
 467         FD_ZERO(rds);
 468         FD_ZERO(exc);
 469         for (i=0;i<npfd;i++) {
 470                 FD_SET(pfd[i].fd,rds);
 471                 FD_SET(pfd[i].fd,exc);
 472                 if (pfd[i].fd>max) max=pfd[i].fd;
 473         }
 474         return max+1;
 475 }
 476
 477 static void save_pidfile(void)
 478 {
 479         if(pidfile[0] != '/')
 480                 strncat(pidfile_path, pidfile, _POSIX_PATH_MAX - strlen(pidfile_path));
 481         else
 482                 strcpy(pidfile_path, pidfile);
 483
 484         int fd = open(pidfile_path,
 485                         O_WRONLY | O_CREAT | O_EXCL,
 486                         S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
 487         FILE *f;
 488
 489         if(fd == -1) {
 490                 printlog(LOG_ERR, "Error in pidfile creation: %s", strerror(errno));
 491                 exit(1);
 492         }
 493
 494         if((f = fdopen(fd, "w")) == NULL) {
 495                 printlog(LOG_ERR, "Error in FILE* construction: %s", strerror(errno));
 496                 exit(1);
 497         }
 498
 499         if(fprintf(f, "%ld\n", (long int)getpid()) <= 0) {
 500                 printlog(LOG_ERR, "Error in writing pidfile");
 501                 exit(1);
 502         }
 503
 504         fclose(f);
 505 }
 506
 507 /* this custom version of daemon(3) continue to receive stderr messages
 508  * until the end of the startup phase, the foreground process terminates
 509  * when stderr gets closed*/
 510 static int special_daemon(void)
 511 {
 512         int fd;
 513         int errorpipe[2];
 514         char buf[256];
 515         int n;
 516
 517         if (pipe(errorpipe))
 518                 return -1;
 519
 520         switch (fork()) {
 521                 case -1:
 522                         return (-1);
 523                 case 0:
 524                         break;
 525                 default:
 526                         close(errorpipe[1]);
 527                         while ((n=read(errorpipe[0],buf,128)) > 0) {
 528                                 write(STDERR_FILENO,buf,n);
 529                         }
 530                         _exit(0);
 531         }
 532         close(errorpipe[0]);
 533
 534         if (setsid() == -1)
 535                 return (-1);
 536
 537         (void)chdir("/");
 538
 539         if ((fd = open("/dev/null", O_RDWR, 0)) != -1) {
 540                 (void)dup2(fd, STDIN_FILENO);
 541                 (void)dup2(fd, STDOUT_FILENO);
 542                 (void)dup2(errorpipe[1], STDERR_FILENO);
 543                 close(errorpipe[1]);
 544                 if (fd > 2)
 545                         (void)close (fd);
 546         }
 547         return 0;
 548 }
 549
 550 int main(int argc, char *argv[])
 551 {
 552         struct netif *nif;
 553         int vdefd;
 554         char *conffile=NULL;
 555         char *nodename=NULL;
 556         int c;
 557
 558         progname=argv[0];
 559
 560         while (1) {
 561                 int option_index = 0;
 562
 563                 static struct option long_options[] = {
 564                         {"daemon", 0, 0, 'd'},
 565                         {"mgmt", 1, 0, 'M'},
 566                         {"telnet", 0, 0, 't'},
 567                         {"web", 0, 0, 'w'},
 568                         {"help",0,0,'h'},
 569                         {"rcfile",1,0,'f'},
 570                         {"nodename",1,0,'n'},
 571                         {"pidfile", 1, 0, 'p'},
 572                         {0, 0, 0, 0}
 573                 };
 574                 c = getopt_long_only (argc, argv, "hdwtM:f:n:",
 575                                 long_options, &option_index);
 576                 if (c == -1)
 577                         break;
 578
 579                 switch (c) {
 580                         case 'M':
 581                                 mgmt=strdup(optarg);
 582                                 break;
 583                         case 'f':
 584                                 conffile=strdup(optarg);
 585                                 break;
 586                         case 'n':
 587                                 nodename=strdup(optarg);
 588                                 break;
 589                         case 't':
 590                                 telnet=1;
 591                                 break;
 592                         case 'w':
 593                                 web=1;
 594                                 break;
 595                         case 'd':
 596                                 daemonize=1;
 597                                 break;
 598                         case 'p':
 599                                 pidfile=strdup(optarg);
 600                                 break;
 601                         case 'h':
 602                                 usage(argv[0]); //implies exit
 603                                 break;
 604                 }
 605         }
 606         if (optind < argc && mgmt==NULL)
 607                 mgmt=argv[optind];
 608
 609         if (mgmt==NULL) {
 610                 printlog(LOG_ERR,"mgmt_socket not defined");
 611                 exit(-1);
 612         }
 613         if (telnet==0 && web==0) {
 614                 printlog(LOG_ERR,"at least one service option (-t -w) must be specified");
 615                 exit(-1);
 616         }
 617
 618         atexit(cleanup);
 619         setsighandlers();
 620
 621         /* saves current path in pidfile_path, because otherwise with daemonize() we
 622          * forget it */
 623         if(getcwd(pidfile_path, _POSIX_PATH_MAX-1) == NULL) {
 624                 printlog(LOG_ERR, "getcwd: %s", strerror(errno));
 625                 exit(1);
 626         }
 627         strcat(pidfile_path, "/");
 628
 629         /* call daemon before starting the stack otherwise the stack threads
 630          * does not get inherited by the forked process */
 631         if (daemonize && special_daemon()) {
 632                 printlog(LOG_ERR,"daemon: %s",strerror(errno));
 633                 exit(1);
 634         }
 635
 636         lwipstack=lwip_stack_new();
 637         lwip_stack_set(lwipstack);
 638
 639         vdefd = openvdem(mgmt, argv[0], &nif, nodename);
 640
 641         /* If rcfile is specified, try it and nothing else */
 642         if (conffile && readconffile(conffile,nif) < 0)
 643         {
 644                 printlog(LOG_ERR, "Error reading configuration file '%s': %s", conffile, strerror(errno));
 645                 exit(1);
 646         }
 647         /* Else try default ones */
 648         else if (!conffile)
 649         {
 650                 int rv;
 651                 char *homedir = getenv("HOME");
 652                 if (homedir)
 653                 {
 654                         int len = strlen(homedir) + strlen(USERCONFFILE) + 1;
 655                         conffile = malloc(len);
 656                         snprintf(conffile, len, "%s%s", homedir, USERCONFFILE);
 657                         if ((rv = readconffile(conffile, nif)) >= 0)
 658                                 free(conffile);
 659                 }
 660                 if (!homedir || rv < 0)
 661                         rv = readconffile(conffile = ROOTCONFFILE, nif);
 662
 663                 if (rv < 0)
 664                 {
 665                         printlog(LOG_ERR, "Error reading configuration file '%s': %s", conffile, strerror(errno));
 666                         exit(1);
 667                 }
 668         }
 669
 670         /* once here, we're sure we're the true process which will continue as a
 671          * server: save PID file if needed */
 672         if(pidfile) save_pidfile();
 673
 674         if (telnet)
 675                 telnet_init(vdefd);
 676         if (web)
 677                 web_init(vdefd);
 678
 679         if (daemonize) {
 680                 int fd;
 681                 if ((fd=open("/dev/null",O_RDWR)) >= 0) {
 682                         close(STDERR_FILENO);
 683                         dup2(fd,STDERR_FILENO);
 684                         close(fd);
 685                         openlog(basename(argv[0]), LOG_PID, 0);
 686                         logok=1;
 687                 }
 688                 printlog(LOG_INFO,"VDETELWEB started");
 689         }
 690
 691         while (1)
 692         {
 693                 int n,m,i;
 694                 fd_set rds,exc;
 695                 int max=setfds(&rds,&exc);
 696                 m=lwip_select(max,&rds,NULL,&exc,NULL);
 697                 for(i=0; m>0 && i<max; i++) {
 698                         if (FD_ISSET(i,&rds) || FD_ISSET(i,&exc)) {
 699                                 n=pfdsearch(i);
 700                                 fpfd[n](n,i,vdefd);
 701                                 m--;
 702                         }
 703                 }
 704         }
 705 }
 706