lib/strip.c

   1 /*
   2  * lib/strip.c  This file contains an implementation of the STRIP
   3  *              support functions.
   4  *
   5  * Version:     strip.c 1.20 1999/04/22 eswierk
   6  *
   7  * Author:      Stuart Cheshire <cheshire@cs.stanford.edu>
   8  *
   9  *              This program is free software; you can redistribute it
  10  *              and/or  modify it under  the terms of  the GNU General
  11  *              Public  License as  published  by  the  Free  Software
  12  *              Foundation;  either  version 2 of the License, or  (at
  13  *              your option) any later version.
  14  */
  15 #include "config.h"
  16
  17 #if HAVE_HWSTRIP
  18
  19 #include <sys/types.h>
  20 #include <sys/ioctl.h>
  21 #include <sys/socket.h>
  22 #include <net/if_arp.h>
  23 #include <linux/types.h>
  24 #include <linux/if_strip.h>
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <ctype.h>
  28 #include <errno.h>
  29 #include <fcntl.h>
  30 #include <string.h>
  31 #include <termios.h>
  32 #include <unistd.h>
  33 #include "net-support.h"
  34 #include "pathnames.h"
  35 #include "util.h"
  36 #include "intl.h"
  37
  38
  39 extern struct hwtype strip_hwtype;
  40
  41 static char *
  42 pr_strip(unsigned char *ptr)
  43 {
  44   static char buff[64];
  45   if(ptr[1])
  46       sprintf(buff, "%02x-%02x%02x-%02x%02x", *(ptr+1), *(ptr+2), *(ptr+3),
  47           *(ptr+4), *(ptr+5));
  48    else
  49       sprintf(buff, "%02x%02x-%02x%02x", *(ptr+2), *(ptr+3), *(ptr+4),
  50           *(ptr+5));
  51   return buff;
  52 }
  53
  54 static int
  55 in_strip(char *bufp, struct sockaddr *sap)
  56 {
  57   int i,i0;
  58   MetricomAddress *haddr = (MetricomAddress *) (sap->sa_data);
  59
  60
  61   sap->sa_family = strip_hwtype.type;
  62
  63   /* figure out what the device-address should be */
  64   i0 = i = (bufp[0] == '*') ? 1 : 0;
  65
  66   while (bufp[i] && (bufp[i] != '-'))
  67     i++;
  68
  69   if (bufp[i] != '-')
  70     return -1;
  71
  72   if(i-i0 == 2)
  73   {
  74      haddr->c[1] = strtol(&bufp[i0], 0, 16);
  75      i++;
  76      if(bufp[i] == 0) return -1;
  77   }else{
  78      haddr->c[1] = 0;
  79      i=i0;
  80   }
  81   haddr->c[2] = strtol(&bufp[i], 0, 16) >> 8;
  82   haddr->c[3] = strtol(&bufp[i], 0, 16) & 0xFF;
  83
  84   while (bufp[i] && (bufp[i] != '-'))
  85     i++;
  86
  87   if (bufp[i] != '-')
  88     return -1;
  89
  90   haddr->c[4] = strtol(&bufp[i+1], 0, 16) >> 8;
  91   haddr->c[5] = strtol(&bufp[i+1], 0, 16) & 0xFF;
  92   haddr->c[0] = 0;
  93
  94   return 0;
  95 }
  96
  97
  98
  99 /* Start the STRIP encapsulation on the file descriptor. */
 100 static int do_strip(int fd)
 101         {
 102         int disc = N_STRIP;
 103         if (ioctl(fd, TIOCSETD, &disc) < 0)
 104                 {
 105                 fprintf(stderr, "STRIP_set_disc(%d): %s\n", disc, strerror(errno));
 106                 return(-errno);
 107                 }
 108         return(0);
 109         }
 110
 111 struct hwtype strip_hwtype = {
 112   "strip", "Metricom Starmode IP", ARPHRD_METRICOM, sizeof(MetricomAddress),
 113   pr_strip, in_strip, do_strip, 0
 114 };
 115
 116 #endif  /* HAVE_HWSTRIP */