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