inetdmx.c

   1 /*
   2  * $Id$
   3  * Latest:
   4  *      http://cvs.jankratochvil.net/viewcvs/nethome/src/inetdmx.c?rev=HEAD
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; you must use version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20
  21 #define _GNU_SOURCE 1
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <sys/types.h>
  25 #include <sys/socket.h>
  26 #include <sys/un.h>
  27 #include <sys/poll.h>
  28 #include <fcntl.h>
  29 #include <unistd.h>
  30 #include <sys/stat.h>
  31 #include <errno.h>
  32 #include <netinet/in.h>
  33 #include <string.h>
  34 #include <getopt.h>
  35 #include <sys/wait.h>
  36 #include <stdarg.h>
  37 #include <syslog.h>
  38 #include <sys/file.h>
  39 #include <utime.h>
  40 #include <time.h>
  41 #include <assert.h>
  42
  43
  44 #define CONNECT_RETRY_MSEC 100
  45 #define DEFAULT_START_COMMAND_TIMEOUT 60
  46 #define DEFAULT_IDLE_SERVER_TIMEOUT (90*60)
  47 #define FLOCK_TIMEOUT_OVER_START_TIMEOUT 2
  48 #define SESSION_BUFFER_SIZE 0x1000
  49 #define SYSTEM_CHECKED_BUFFER_SIZE_MIN 0x1000
  50 #define SYSTEM_CHECKED_BUFFER_SIZE (LINE_MAX > SYSTEM_CHECKED_BUFFER_SIZE_MIN ? LINE_MAX : SYSTEM_CHECKED_BUFFER_SIZE_MIN)
  51
  52
  53 /* /usr/include/glib-2.0/glib/gmacros.h */
  54 #ifndef G_GNUC_PRINTF
  55 #if     __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
  56 #define G_GNUC_PRINTF( format_idx, arg_idx )    \
  57   __attribute__((__format__ (__printf__, format_idx, arg_idx)))
  58 #else   /* !__GNUC__ */
  59 #define G_GNUC_PRINTF( format_idx, arg_idx )
  60 #endif  /* !__GNUC__ */
  61 #endif /* !G_GNUC_PRINTF */
  62
  63 /* /usr/include/glib-2.0/glib/gmacros.h */
  64 #ifndef G_GNUC_NORETURN
  65 #if     __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
  66 #define G_GNUC_NORETURN                         \
  67   __attribute__((__noreturn__))
  68 #else   /* !__GNUC__ */
  69 #define G_GNUC_NORETURN
  70 #endif  /* !__GNUC__ */
  71 #endif /* !G_GNUC_NORETURN */
  72
  73 /* /usr/include/glib-2.0/glib/gmacros.h */
  74 /* Count the number of elements in an array. The array must be defined
  75  * as such; using this with a dynamically allocated array will give
  76  * incorrect results.
  77  */
  78 #define G_N_ELEMENTS(arr)               (sizeof (arr) / sizeof ((arr)[0]))
  79
  80
  81 static const char *program_name;
  82
  83 static int opt_start;
  84 static int opt_stop;
  85 static long opt_start_command_timeout=DEFAULT_START_COMMAND_TIMEOUT;
  86 static long opt_idle_server_timeout=DEFAULT_IDLE_SERVER_TIMEOUT;
  87 static int opt_port;
  88 static int opt_syslog;
  89 static int opt_stderr;
  90 static const char *opt_lock;
  91 static int opt_ignore_spawned_command_output;
  92 static char *opt_command;
  93
  94
  95 static void fatal(const char *fmt,...) G_GNUC_PRINTF(1,2) G_GNUC_NORETURN;
  96
  97 /* for atexit(3) function */
  98 static int verror_quiet;
  99
 100 static void verror(const char *fmt,va_list ap) G_GNUC_PRINTF(1,0);
 101 static void verror(const char *fmt,va_list ap)
 102 {
 103 int use_syslog=opt_syslog,use_stderr=opt_stderr;
 104 char *string;
 105 const char *const double_error="Error printing error message";
 106
 107         if (verror_quiet)
 108                 return;
 109         if (!use_syslog && !use_stderr)
 110                 use_stderr=1;
 111         if (-1==vasprintf(&string,fmt,ap)) {
 112                 if (fmt==double_error)
 113                         exit(EXIT_FAILURE);
 114                 fatal(double_error);
 115                 }
 116         if (use_stderr)
 117                 fprintf(stderr,"%s: %s\n",program_name,string);
 118         if (use_syslog) {
 119                 openlog(program_name,LOG_PID,LOG_DAEMON);
 120                 syslog(LOG_DAEMON|LOG_ERR,"%s",string);
 121                 closelog();
 122                 }
 123 }
 124
 125 static void error(const char *fmt,...) G_GNUC_PRINTF(1,2);
 126 static void error(const char *fmt,...)
 127 {
 128 va_list ap;
 129
 130         va_start(ap,fmt);
 131         verror(fmt,ap);
 132         va_end(ap);
 133 }
 134
 135 static void fatal(const char *fmt,...)
 136 {
 137 va_list ap;
 138
 139         va_start(ap,fmt);
 140         verror(fmt,ap);
 141         va_end(ap);
 142         exit(EXIT_FAILURE);
 143 }
 144
 145 static char *asprintf_checked(const char *fmt,...) G_GNUC_PRINTF(1,2);
 146 static char *asprintf_checked(const char *fmt,...)
 147 {
 148 char *string;
 149 va_list ap;
 150 int rc;
 151
 152         va_start(ap,fmt);
 153         rc=vasprintf(&string,fmt,ap);
 154         va_end(ap);
 155         if (rc==-1)
 156                 fatal("Error formatting string using formatstring: %s",fmt);
 157         return string;
 158 }
 159
 160 static void *xmalloc(size_t size)
 161 {
 162 void *r;
 163
 164         if ((r=malloc(size)))
 165                 return r;
 166         fatal("Error allocing %lu bytes",(unsigned long)size);
 167 }
 168
 169 static void usage(void)
 170 {
 171         fprintf(stderr,"\
 172 Syntax: %s {-1|--start} [{-T|--start-command-timeout} <start-command-timeout>]\n\
 173         \t[{-l|--lock} <filename>] [-S|--syslog] [-e|--stderr]\n\
 174         \t\[-I|--ignore-spawned-command-output]\n\
 175         \t{-p|--port} <server-port> <start-server-command>\n\
 176      or %s {-0|--stop}  [{-i|--idle-server-timeout} <idle-server-timeout>]\n\
 177         \t[{-l|--lock} <filename>] [-S|--syslog] [-e|--stderr]\n\
 178         \t\[-I|--ignore-spawned-command-output]\n\
 179         \t<stop-server-command>\n\
 180 \n\
 181 Error messages are printed to stderr by default,\n\
 182 -S|--syslog omits stderr output, both -S|--syslog and -e|--stderr output\n\
 183 the errors by both methods.\n\
 184 -I|--ignore-spawned-command-output will no longer warn of any stdout/stderr\n\
 185 output of <*-server-command>s but it will no longer stuck if they held their\n\
 186 output descriptors open.\n\
 187 \n",program_name,program_name);
 188         exit(EXIT_FAILURE);
 189 }
 190
 191 static const struct option longopts[]={
 192         {"start"                        ,0,0,'1'},
 193         {"stop"                         ,0,0,'0'},
 194         {"start-command-timeout"        ,1,0,'T'},
 195         {"idle-server-timeout"          ,1,0,'i'},
 196         {"syslog"                       ,0,0,'S'},
 197         {"stderr"                       ,0,0,'e'},
 198         {"lock"                         ,1,0,'l'},
 199         {"port"                         ,1,0,'p'},
 200         {"ignore-spawned-command-output",0,0,'I'},
 201         {"help"                         ,0,0,'h'},
 202         {NULL                           ,0,0,0  },
 203         };
 204
 205 static int lock_fd=-1;
 206
 207 static int sighandler_flock_timeout_hit;
 208 static void sighandler_flock_timeout(int signo)
 209 {
 210         sighandler_flock_timeout_hit=1;
 211 }
 212
 213 static int lock_create(int lock_mode)
 214 {
 215 int retries=3;
 216 sighandler_t sighandler_alrm_orig;
 217 int flock_rc;
 218
 219         if (!opt_lock)
 220                 return 1;
 221         /* Never drop the lock if the lock is already being held. */
 222         if (lock_fd!=-1)
 223                 retries=-1;
 224 retry:
 225         if (lock_fd==-1) {
 226                 if (-1==(lock_fd=open(opt_lock,O_CREAT|O_RDWR,0600)))
 227                         fatal("Error creating lock file \"%s\": %m",opt_lock);
 228                 }
 229         sighandler_alrm_orig=signal(SIGALRM,sighandler_flock_timeout);
 230         alarm(opt_start_command_timeout+FLOCK_TIMEOUT_OVER_START_TIMEOUT);
 231         flock_rc=flock(lock_fd,lock_mode);
 232         alarm(0);
 233         signal(SIGALRM,sighandler_alrm_orig);
 234         if (sighandler_flock_timeout_hit)
 235                 fatal("Timeout locking lock file \"%s\": %m",opt_lock);
 236         if (flock_rc) {
 237                 if (lock_mode&LOCK_NB && errno==EWOULDBLOCK)
 238                         return 0;
 239                 fatal("Error locking lock file \"%s\": %m",opt_lock);
 240                 }
 241         if (access(opt_lock,R_OK|W_OK)) {
 242                 if (retries--<=0)
 243                         fatal("Racing for the lock file \"%s\", giving up",opt_lock);
 244                 if (close(lock_fd))
 245                         fatal("Error closing lock file \"%s\": %m",opt_lock);
 246                 lock_fd=-1;
 247                 goto retry;
 248                 }
 249         return 1;
 250 }
 251
 252 static void lock_touch(void)
 253 {
 254         if (!opt_lock || lock_fd==-1)
 255                 return;
 256         if (utime(opt_lock,NULL))
 257                 fatal("Error updating lock file \"%s\" timestamp: %m",opt_lock);
 258 }
 259
 260 static void lock_close(void)
 261 {
 262         if (lock_fd==-1 || !opt_lock)
 263                 return;
 264         /* It should not be needed but some stale locks were seen on:
 265          *      White Box Linux kernel-smp-2.6.9-5.0.5.EL
 266          */
 267         if (flock(lock_fd,LOCK_UN|LOCK_NB))
 268                 fatal("Error unlocking lock file \"%s\": %m",opt_lock);
 269         if (close(lock_fd))
 270                 fatal("Error closing lock file \"%s\": %m",opt_lock);
 271         lock_fd=-1;
 272 }
 273
 274 static void lock_close_atexit(void)
 275 {
 276         /* Prevent some crashes of malloc(3) etc. */
 277         verror_quiet=1;
 278         lock_close();
 279 }
 280
 281 static int connect_try(void)
 282 {
 283 int fdtcp;
 284 struct sockaddr_in sockaddr_tcp;
 285
 286         if (-1==(fdtcp=socket(PF_INET,SOCK_STREAM,0)))
 287                 fatal("socket(PF_INET,SOCK_STREAM,0)=%d: %m",fdtcp);
 288         memset(&sockaddr_tcp,0,sizeof(sockaddr_tcp));
 289         sockaddr_tcp.sin_family=AF_INET;
 290         sockaddr_tcp.sin_addr.s_addr=htonl(INADDR_LOOPBACK);
 291         sockaddr_tcp.sin_port=htons(opt_port);
 292         if (connect(fdtcp,(const struct sockaddr *)&sockaddr_tcp,sizeof(sockaddr_tcp))) {
 293                 if (errno==ECONNREFUSED)
 294                         return -1;
 295                 fatal("connect(TCP socket,127.0.0.1:%d): %m",opt_port);
 296                 }
 297         return fdtcp;
 298 }
 299
 300 static void session_transfer(
 301                 const char *conn0_name,int conn0_fdin,int conn0_fdout,
 302                 const char *conn1_name,int conn1_fdin,int conn1_fdout)
 303                 G_GNUC_NORETURN;
 304 static void session_transfer(
 305                 const char *conn0_name,int conn0_fdin,int conn0_fdout,
 306                 const char *conn1_name,int conn1_fdin,int conn1_fdout)
 307 {
 308 struct pollfd pollfdi[2];
 309 int pollfdo[2];
 310 const char *pollfdi_name[2];
 311 int fdi,fdo;
 312
 313         pollfdi[0].fd=conn0_fdin;
 314         pollfdi[0].events=POLLIN;
 315         pollfdi[1].fd=conn1_fdin;
 316         pollfdi[1].events=POLLIN;
 317         pollfdo[0]=conn0_fdout;
 318         pollfdo[1]=conn1_fdout;
 319         pollfdi_name[0]=conn0_name;
 320         pollfdi_name[1]=conn1_name;
 321         for (;;) {
 322                 if (0>=poll(pollfdi,G_N_ELEMENTS(pollfdi),-1))
 323                         fatal("poll(%s socket,%s socket): %m",pollfdi_name[0],pollfdi_name[1]);
 324                 for (fdi=0;fdi<G_N_ELEMENTS(pollfdi);fdi++)
 325                         if (0
 326                                         ||   pollfdi[fdi].revents & (POLLERR|POLLHUP|POLLNVAL)
 327                                         || ((pollfdi[fdi].revents & POLLIN) && !(pollfdi[fdi].events & POLLIN))
 328                                         )
 329                                 fatal("poll(%s socket): revents=0x%X (events=0x%X)",
 330                                                 pollfdi_name[fdi],(unsigned)pollfdi[fdi].revents,
 331                                                 (unsigned)pollfdi[fdi].events);
 332                 for (fdi=0;fdi<G_N_ELEMENTS(pollfdi);fdi++) {
 333                         for (;;) {
 334                                 ssize_t got;
 335                                 char buf[SESSION_BUFFER_SIZE];
 336
 337                                 if (fcntl(pollfdi[fdi].fd,F_SETFL,O_NONBLOCK))
 338                                         fatal("fcntl(%s socket,F_SETFL,O_NONBLOCK): %m",pollfdi_name[fdi]);
 339                                 got=read(pollfdi[fdi].fd,buf,sizeof(buf));
 340                                 if (got<0) {
 341                                         if (errno==EAGAIN)
 342                                                 break;
 343                                         fatal("read(%s socket): %m",pollfdi_name[fdi]);
 344                                         }
 345                                 if (got==0) {
 346                                         lock_close();
 347                                         exit(EXIT_SUCCESS);
 348                                         }
 349                                 for (fdo=0;fdo<G_N_ELEMENTS(pollfdi);fdo++) {
 350                                         if (fdi==fdo)
 351                                                 continue;
 352                                         if (fcntl(pollfdi[fdo].fd,F_SETFL,0 /* !O_NONBLOCK */))
 353                                                 fatal("fcntl(%s socket,F_SETFL,0 /* !O_NONBLOCK */): %m",
 354                                                                 pollfdi_name[fdo]);
 355                                         if (got!=write(pollfdi[fdo].fd,buf,got))
 356                                                 fatal("write(%s socket,%ld): %m",
 357                                                                 pollfdi_name[fdo],(long)got);
 358                                         }
 359                                 }
 360                         }
 361                 }
 362 }
 363
 364 static void session_try(void)
 365 {
 366 int fdtcp;
 367
 368         if (-1==(fdtcp=connect_try()))
 369                 return;
 370         session_transfer("remote",STDIN_FILENO,STDOUT_FILENO,"local",fdtcp,fdtcp);
 371 }
 372
 373 static int popen_pclose_checked(const char *command)
 374 {
 375 FILE *f;
 376 char buf[SYSTEM_CHECKED_BUFFER_SIZE];
 377 size_t got;
 378
 379         if (!(f=popen(command,"r")))
 380                 fatal("Error opening spawned command \"%s\": %m",command);
 381         setlinebuf(f);
 382         while ((got=fread(buf,1,sizeof(buf)-1,f))) {
 383 char *s,*s_next;
 384
 385                 assert(got<sizeof(buf));
 386                 buf[got]=0;
 387                 for (s=buf;*s;s=s_next) {
 388                         if ((s_next=strchr(s,'\n'))) {
 389                                 *s_next++=0;
 390                                 error("Error line of spawned \"%s\": %s",command,s);
 391                                 }
 392                         else {
 393                                 s_next=s+strlen(s);
 394                                 error("Error line of spawned \"%s\" too long, string cut: %s",command,s);
 395                                 }
 396                         }
 397                 }
 398         if (ferror(f))
 399                 fatal("Error reading output of spawned \"%s\"",command);
 400         if (!feof(f))
 401                 fatal("Error reaching end-of-file of messages of spawned \"%s\"",command);
 402         return pclose(f);
 403 }
 404
 405 static void system_checked(const char *command)
 406 {
 407 int rc;
 408
 409         if (!opt_ignore_spawned_command_output)
 410                 rc=popen_pclose_checked(opt_stderr
 411                                 ? command       /* differentiate ourself-dumped stdout from stderr */
 412                                 : asprintf_checked("(%s) 2>&1",command)
 413                                 );
 414         else
 415                 rc=system(opt_stderr
 416                                 ? asprintf_checked("(%s) >&2",command)
 417                                 : asprintf_checked("(%s) &>/dev/null",command)
 418                                 );
 419         if (WIFEXITED(rc) && !WEXITSTATUS(rc))
 420                 return;
 421         if (WIFEXITED(rc))
 422                 fatal("Error spawning command \"%s\": return code %d",
 423                                 command,WEXITSTATUS(rc));
 424 #ifdef WCOREDUMP
 425         if (WIFSIGNALED(rc) && WCOREDUMP(rc))
 426                 fatal("Error spawning command \"%s\": dumped core (terminating signal %d)",
 427                                 command,WTERMSIG(rc));
 428 #endif /* WCOREDUMP */
 429         if (WIFSIGNALED(rc))
 430                 fatal("Error spawning command \"%s\": terminating signal %d",
 431                                 command,WTERMSIG(rc));
 432         if (WIFSTOPPED(rc))
 433                 fatal("Error spawning command \"%s\": stopping signal %d",
 434                                 command,WSTOPSIG(rc));
 435 #ifdef WIFCONTINUED
 436         if (WIFCONTINUED(rc))
 437                 fatal("Error spawning command \"%s\": resumed by SIGCONT",
 438                                 command);
 439 #endif /* WIFCONTINUED */
 440         fatal("Error spawning command \"%s\": unknown reason",
 441                         command);
 442 }
 443
 444 static void start(void) G_GNUC_NORETURN;
 445 static void start(void)
 446 {
 447 int retry;
 448
 449         if (!opt_port)
 450                 fatal("-p|--port is a required argument for -1|--start");
 451         if (opt_idle_server_timeout!=DEFAULT_IDLE_SERVER_TIMEOUT)
 452                 fatal("-i|--idle-server-timeout is a forbidden argument for -1|--start");
 453
 454         lock_create(LOCK_SH);
 455         lock_touch();
 456         session_try();
 457         lock_close();
 458
 459         lock_create(LOCK_EX);
 460         system_checked(opt_command);
 461         lock_create(LOCK_SH);
 462
 463         for (retry=0;retry*CONNECT_RETRY_MSEC/1000<opt_start_command_timeout;retry++) {
 464                 lock_touch();
 465                 session_try();
 466                 if (poll(NULL,0,CONNECT_RETRY_MSEC))
 467                         fatal("poll(timeout %dmsec): %m",CONNECT_RETRY_MSEC);
 468                 }
 469         fatal("Timed out after %ld seconds connecting to port %d after spawned: %s",
 470                         opt_start_command_timeout,opt_port,opt_command);
 471 }
 472
 473 /* Returns: Is fresh or does not exist? */
 474 static int lock_open_and_time_check(int lock_mode)
 475 {
 476 struct stat statbuf;
 477
 478         if (!opt_lock)
 479                 return 0;
 480
 481         if (access(opt_lock,R_OK|W_OK)) {
 482                 if (errno==ENOENT)
 483                         return 1;
 484                 fatal("Error checking existance of the lock file \"%s\": %m",opt_lock);
 485                 }
 486         if (!lock_create(lock_mode|LOCK_NB))
 487                 return 0;
 488         if (lock_fd==-1 || fstat(lock_fd,&statbuf))
 489                 fatal("Error fstat(2)ting lock file \"%s\": %m",opt_lock);
 490         return statbuf.st_mtime>=time(NULL)-opt_idle_server_timeout;
 491 }
 492
 493 static void lock_delete_and_close(void)
 494 {
 495         if (opt_lock && lock_fd!=-1)
 496                 if (unlink(opt_lock))
 497                         fatal("Error deleting no longer used lock file \"%s\": %m",opt_lock);
 498         lock_close();
 499 }
 500
 501 static void stop(void) G_GNUC_NORETURN;
 502 static void stop(void)
 503 {
 504 int is_fresh;
 505
 506         /* Lock still being held! */
 507         if (opt_port)
 508                 fatal("-p|--port is a forbidden argument for -0|--stop");
 509         if (opt_start_command_timeout!=DEFAULT_START_COMMAND_TIMEOUT)
 510                 fatal("-T|--start-command-timeout is a forbidden argument for -0|--stop");
 511         if (opt_idle_server_timeout!=DEFAULT_IDLE_SERVER_TIMEOUT && !opt_lock)
 512                 fatal("-l|--lock is a required argument for -i|--idle-server-timeout of -1|--start");
 513
 514         is_fresh=lock_open_and_time_check(LOCK_SH);
 515         lock_close();
 516         if (is_fresh)
 517                 exit(EXIT_SUCCESS);
 518
 519         lock_open_and_time_check(LOCK_EX);
 520         system_checked(opt_command);
 521         lock_delete_and_close();
 522
 523         exit(EXIT_SUCCESS);
 524 }
 525
 526 int main(int argc,char **argv) G_GNUC_NORETURN;
 527 int main(int argc,char **argv)
 528 {
 529 char optc;
 530 size_t opt_command_len;
 531 int i;
 532 char *s;
 533
 534         if ((program_name=strrchr(argv[0],'/')))
 535                 program_name++;
 536         else
 537                 program_name=argv[0];
 538
 539         atexit(lock_close_atexit);
 540
 541         optarg=NULL; optind=0;  /* FIXME: Possible portability problem. */
 542         while ((optc=getopt_long(argc,argv,"01T:i:Sel:p:Ih",longopts,NULL))!=EOF) switch (optc) {
 543 long l;
 544 char *endptr;
 545
 546                 case '1':       /* -1|--start */
 547                         opt_start=1;
 548                         break;
 549
 550                 case '0':       /* -0|--stop */
 551                         opt_stop=1;
 552                         break;
 553
 554                 case 'T':       /* -T|--start-command-timeout */
 555                         l=strtol(optarg,&endptr,0);
 556                         if (l<=0 || l>=LONG_MAX-FLOCK_TIMEOUT_OVER_START_TIMEOUT || (endptr && *endptr))
 557                                 fatal("Invalid -T|--start-command-timeout value: %s",optarg);
 558                         opt_start_command_timeout=l;
 559                         break;
 560
 561                 case 'i':       /* -i|--idle-server-timeout */
 562                         l=strtol(optarg,&endptr,0);
 563                         if (l<=0 || l>=LONG_MAX || (endptr && *endptr))
 564                                 fatal("Invalid -i|--idle-server-timeout value: %s",optarg);
 565                         opt_idle_server_timeout=l;
 566                         break;
 567
 568                 case 'S':       /* -S|--syslog */
 569                         opt_syslog=1;
 570                         break;
 571
 572                 case 'e':       /* -e|--stderr */
 573                         opt_stderr=1;
 574                         break;
 575
 576                 case 'l':       /* -l|--lock */
 577                         opt_lock=optarg;
 578                         break;
 579
 580                 case 'I':       /* -I|--ignore-spawned-command-output */
 581                         opt_ignore_spawned_command_output=1;
 582                         break;
 583
 584                 case 'p':       /* -p|--port */
 585                         l=strtol(optarg,&endptr,0);
 586                         if (l<=0 || l>=0x10000 || (endptr && *endptr))
 587                                 fatal("Invalid -p|--port value: %s",optarg);
 588                         opt_port=l;
 589                         break;
 590
 591                 default:
 592                         if (optc!='h')
 593                                 fatal("Error parsing commandline");
 594                         usage();
 595                         break;
 596                 }
 597
 598         if (!opt_start && !opt_stop)
 599                 fatal("At least one of -1|--start or -0|--stop is required");
 600         if ( opt_start &&  opt_stop)
 601                 fatal("Both modes -1|--start and -0|--stop can never be specified simultaneously");
 602
 603         if (optind>=argc)
 604                 fatal("<start-server-command/stop-server-command> is a required argument");
 605         opt_command_len=0;
 606         for (i=optind;i<argc;i++)
 607                 opt_command_len+=strlen(argv[i])+1;
 608         opt_command=xmalloc(opt_command_len);
 609         s=opt_command;
 610         for (i=optind;i<argc;i++) {
 611 size_t argv_i_len=strlen(argv[i]);
 612
 613                 if (s>opt_command)
 614                         *s++=' ';
 615                 memcpy(s,argv[i],argv_i_len);
 616                 s+=argv_i_len;
 617                 }
 618         *s++=0;
 619         assert(s==opt_command+opt_command_len);
 620
 621         if (!opt_syslog && !opt_stderr)
 622                 opt_stderr=1;
 623
 624         if (opt_start)
 625                 start();
 626         if (opt_stop)
 627                 stop();
 628         assert(0);
 629 }