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