contrib/tcp_wrappers/misc.c

   1  /*
   2   * Misc routines that are used by tcpd and by tcpdchk.
   3   *
   4   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
   5   *
   6   * $FreeBSD: src/contrib/tcp_wrappers/misc.c,v 1.2 2000/02/03 10:26:58 shin Exp $
   7   * $DragonFly: src/contrib/tcp_wrappers/misc.c,v 1.2 2003/06/17 04:24:06 dillon Exp $
   8   */
   9
  10 #ifndef lint
  11 static char sccsic[] = "@(#) misc.c 1.2 96/02/11 17:01:29";
  12 #endif
  13
  14 #include <sys/types.h>
  15 #include <sys/param.h>
  16 #include <netinet/in.h>
  17 #include <arpa/inet.h>
  18 #include <stdio.h>
  19 #include <string.h>
  20
  21 #include "tcpd.h"
  22
  23 extern char *fgets();
  24
  25 #ifndef INADDR_NONE
  26 #define INADDR_NONE     (-1)            /* XXX should be 0xffffffff */
  27 #endif
  28
  29 /* xgets - fgets() with backslash-newline stripping */
  30
  31 char   *xgets(ptr, len, fp)
  32 char   *ptr;
  33 int     len;
  34 FILE   *fp;
  35 {
  36     int     got;
  37     char   *start = ptr;
  38
  39     while (len > 1 && fgets(ptr, len, fp)) {
  40         got = strlen(ptr);
  41         if (got >= 1 && ptr[got - 1] == '\n') {
  42             tcpd_context.line++;
  43             if (got >= 2 && ptr[got - 2] == '\\') {
  44                 got -= 2;
  45             } else {
  46                 return (start);
  47             }
  48         }
  49         ptr += got;
  50         len -= got;
  51         ptr[0] = 0;
  52     }
  53     return (ptr > start ? start : 0);
  54 }
  55
  56 /* split_at - break string at delimiter or return NULL */
  57
  58 char   *split_at(string, delimiter)
  59 char   *string;
  60 int     delimiter;
  61 {
  62     char   *cp;
  63
  64 #ifdef INET6
  65     int bracket = 0;
  66
  67     for (cp = string; cp && *cp; cp++) {
  68         switch (*cp) {
  69         case '[':
  70             bracket++;
  71             break;
  72         case ']':
  73             bracket--;
  74             break;
  75         default:
  76             if (bracket == 0 && *cp == delimiter) {
  77                 *cp++ = 0;
  78                 return cp;
  79             }
  80             break;
  81         }
  82     }
  83     return (NULL);
  84 #else
  85     if ((cp = strchr(string, delimiter)) != 0)
  86         *cp++ = 0;
  87     return (cp);
  88 #endif
  89 }
  90
  91 /* dot_quad_addr - convert dotted quad to internal form */
  92
  93 unsigned long dot_quad_addr(str)
  94 char   *str;
  95 {
  96     int     in_run = 0;
  97     int     runs = 0;
  98     char   *cp = str;
  99
 100     /* Count the number of runs of non-dot characters. */
 101
 102     while (*cp) {
 103         if (*cp == '.') {
 104             in_run = 0;
 105         } else if (in_run == 0) {
 106             in_run = 1;
 107             runs++;
 108         }
 109         cp++;
 110     }
 111     return (runs == 4 ? inet_addr(str) : INADDR_NONE);
 112 }