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
xgets(ptr,len,fp)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
split_at(string,delimiter)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
dot_quad_addr(str)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 }
112