File: misc.c

package info (click to toggle)
tcp-wrappers 7.6.q-31
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid
  • size: 1,828 kB
  • sloc: ansic: 17,852; makefile: 2,308; sh: 39
file content (126 lines) | stat: -rw-r--r-- 2,251 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
 /*
  * Misc routines that are used by tcpd and by tcpdchk.
  * 
  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  */

#ifndef lint
static char sccsic[] = "@(#) misc.c 1.2 96/02/11 17:01:29";
#endif

#include <sys/types.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "tcpd.h"

extern char *fgets();

#ifndef	INADDR_NONE
#define	INADDR_NONE	(-1)		/* XXX should be 0xffffffff */
#endif

/* xgets - fgets() with backslash-newline stripping */

char   *xgets(ptr, len, fp)
char   *ptr;
int     len;
FILE   *fp;
{
    int     got;
    char   *start = ptr;

    while (fgets(ptr, len, fp)) {
	got = strlen(ptr);
	if (got >= 1 && ptr[got - 1] == '\n') {
	    tcpd_context.line++;
	    if (got >= 2 && ptr[got - 2] == '\\') {
		got -= 2;
	    } else {
		return (start);
	    }
	}
	ptr += got;
	len -= got;
	if (len == 1)
	    return(start);
	ptr[0] = 0;
    }
    return (ptr > start ? start : 0);
}

/* split_at - break string at delimiter or return NULL */

char   *split_at(string, delimiter)
char   *string;
int     delimiter;
{
    char   *cp;

#ifdef INET6
    int bracket = 0;

    for (cp = string; cp && *cp; cp++) {
	switch (*cp) {
	case '[':
	    bracket++;
	    break;
	case ']':
	    bracket--;
	    break;
	default:
	    if (bracket == 0 && *cp == delimiter) {
		*cp++ = 0;
		return cp;
	    }
	    break;
	}
    }
    return (NULL);
#else
    if ((cp = strchr(string, delimiter)) != 0)
	*cp++ = 0;
    return (cp);
#endif
}

/* dot_quad_addr - convert dotted quad to internal form */

unsigned long dot_quad_addr(str)
char   *str;
{
    int     in_run = 0;
    int     runs = 0;
    char   *cp = str;

    /* Count the number of runs of non-dot characters. */

    while (*cp) {
	if (*cp == '.') {
	    in_run = 0;
	} else if (in_run == 0) {
	    in_run = 1;
	    runs++;
	}
	cp++;
    }
    return (runs == 4 ? inet_addr(str) : INADDR_NONE);
}

/* cidr_mask_addr - convert cidr netmask length to internal form */

unsigned long cidr_mask_addr(str)
char   *str;
{
    int     maskbits;

    maskbits = atoi(str);
    if (maskbits < 1 || maskbits > 32)
	return (0);
    return htonl(0xFFFFFFFF << (32 - maskbits));
}