config.c

This directory contains source code for tcpdump, a tool for network monitoring and data acquisition

/*
 * Tcpdump .INI-file parser
 */

#include <stdlib.h>
#include <dos.h>
#include <io.h>
#include <fcntl.h>
#include <ctype.h>
#include <string.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <arpa/inet.h>

#include "interfac.h"
#include "a2name.h"

#ifdef USE_SECTION_LOCKING
  extern int using_section_locking;
  void *config_dummy = &using_section_locking;
#endif

/* Function internal to Watt-32 are used here too
 */
extern char *ExpandVarStr    (const char *str);

static void parse_config (FILE *fil);
static void set_values   (char *name, char *value, int line);
static int  get_colour   (char *value, int *col);

int tcpdump_init (const char *ini_file)
{
  FILE *fil = fopen (ini_file, "rt");

  if (!fil)
  {
    PERROR (("`%s' not found\n", ini_file));
    return (0);
  }
  parse_config (fil);
  fclose (fil);
  return (1);
}


/*
 * Read the ini-file one character at a time building up name/value
 * pair that's further parsed in set_values().
 */
static void parse_config (FILE *fil)
{
  char name[_MAX_PATH], value[80], buf[2];
  int  quotemode, mode;
  int  ch, line = 1;

  buf[1] = '\0';
  *name = *value = mode = 0;
  quotemode = 0;

  while ((ch = fgetc(fil)) != EOF)
  {
    switch (ch)
    {
      case '\"': quotemode ^= 1;
                 break;
      case ' ' :
      case '\t': if (quotemode)
                    goto addit;
                 break;

      case '=' : if (quotemode)
                    goto addit;
                 if (!mode)
                    mode = 1;
                 break;
      case '#' :
      case ';' : if (quotemode)
                    goto addit;
                 mode = 2;   /* comment */
                 break;

      case '\n': line++;
      case '\r':
                 if (*name && *value)
                 {
                   char *var = ExpandVarStr (value);

                   if (var != value)
                      strcpy (value, var);
                   strupr (name);
                   set_values (name, value, line);
                 }
                 *name = *value = quotemode = 0;
                 mode = 0;
                 break;
      default:
    addit:       switch (mode)
                 {
                   case 0: buf[0] = ch;
                           strcat (name, buf);
                           break;
                   case 1: buf[0] = ch;
                           strcat (value, buf);
                           break;
                 }
                 break;
    }
  }
}

/*
 * Set value for right-side (name) to value
 */
static void set_values (char *name, char *value, int line)
{
  if (!strcmp(name,"INTERFACE"))
  {
    if (!pcap_device && strnicmp(value,"auto",4)) /* don't override cmd-line */
       pcap_device = savestr (value);
    return;
  }

#if 0
  if (!strcmp(name,"LOCALNET"))
  {
    localnet = inet_aton (value,NULL); /* overridden by pcap_lookupnet() */
    return;
  }
  if (!strcmp(name,"NETMASK"))
  {
    netmask = inet_aton (value,NULL);  /* overridden by pcap_lookupnet() */
    return;
  }
#endif

  if (!strcmp(name,"ETHERS"))
  {
    ether_file = savestr (path_program(value));
    return;
  }
  if (!strcmp(name,"ATALK"))
  {
    atalk_file = savestr (path_program(value));
    return;
  }

  if (!strcmp(name,"HOSTS")     || !strcmp(name,"SERVICES") ||
      !strcmp(name,"PROTOCOLS") || !strcmp(name,"NETWORKS"))
     return;

  if (!strcmp(name,"COLOUR.MAIN"))
  {
    get_colour (value, &colour_main);
    return;
  }
  if (!strcmp(name,"COLOUR.STATUS"))
  {
    get_colour (value, &colour_stat);
    return;
  }
  if (!strcmp(name,"COLOUR.DEBUG"))
  {
    get_colour (value, &colour_debug);
    return;
  }
  if (!strcmp(name,"BREAK_MODE"))
  {
    break_mode = atoi (value);
    return;
  }
  if (!pcap_config_hook(name,value))
  {
#if 0
   /* ignore key/values used by 32-bit drivers
    */
    WARNING (("Unknown INI-line at line %d: \"%s = %s\"\n",
              line-1, name, value));
    sleep (1);
#endif
  }
}

/*
 * Extract "fg/bg" colour from value. Set result into '*col'
 */
static int get_colour (char *value, int *col)
{
  static char *fg_tab[] = {
              "black",   "blue",        "green",     "cyan",
              "red",     "magenta",     "brown",     "lightgray",
              "darkgray","lightblue",   "lightgreen","lightcyan",
              "lightred","lightmagenta","yellow",    "white"
            };

  static char *bg_tab[] = {
              "black", "blue",    "green", "cyan",
              "red",   "magenta", "brown", "lightgray"
            };

  char fg[30], bg[30];
  int  fg_col, bg_col;

  if (!value || !strchr(value,'/') ||
      strlen(value) > sizeof(fg)+sizeof(bg))
     return (0);

  if (sscanf(value,"%[^/]/%s", fg, bg) < 2)
     return (0);

  for (fg_col = 0; fg_col < DIM(fg_tab); fg_col++)
      if (!stricmp(fg_tab[fg_col],fg))
         break;

  for (bg_col = 0; bg_col < DIM(bg_tab); bg_col++)
      if (!stricmp(bg_tab[bg_col],bg))
         break;

  if (fg_col >= DIM(fg_tab) || bg_col >= DIM(bg_tab))
     return (0);

  *col = fg_col + 16*bg_col;
  return (1);
}