Commit | Line | Data |
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ad787160 C |
1 | /* hosts.c - find out the official name of a host */ |
2 | #ifndef lint | |
3 | static char ident[] = "@(#)$Id: hosts.c,v 1.7 1992/12/15 00:20:22 jromine Exp $"; | |
4 | #endif /* lint */ | |
5 | ||
6 | /* LINTLIBRARY */ | |
7 | ||
8 | /* In the SendMail world, we really don't know what the valid hosts are. | |
9 | We could poke around in the sendmail.cf file, but that still isn't a | |
10 | guarantee. As a result, we'll say that everything is a valid host, and | |
11 | let SendMail worry about it. */ | |
12 | ||
13 | ||
14 | #include "../h/strings.h" | |
15 | #include <stdio.h> | |
16 | #include "../zotnet/mts.h" | |
17 | #include <ctype.h> | |
18 | #if defined(BSD42) || defined(SOCKETS) | |
19 | #include <netdb.h> | |
20 | #endif /* BSD42 or SOCKETS */ | |
21 | ||
22 | ||
23 | #define NOTOK (-1) | |
24 | ||
25 | ||
26 | static struct host { | |
27 | char *h_name; | |
28 | char **h_aliases; | |
29 | struct host *h_next; | |
30 | } hosts; | |
31 | ||
32 | char *getcpy (); | |
33 | ||
34 | static int init_hs(); | |
35 | ||
36 | /* \f */ | |
37 | ||
38 | char *OfficialName (name) | |
39 | register char *name; | |
40 | { | |
41 | register char *p; | |
42 | char *q, | |
43 | site[BUFSIZ]; | |
44 | #if defined(BSD42) || defined(SOCKETS) | |
45 | register struct hostent *hp; | |
46 | #endif /* BSD42 or SOCKETS */ | |
47 | static char buffer[BUFSIZ]; | |
48 | register char **r; | |
49 | register struct host *h; | |
50 | ||
51 | for (p = name, q = site; *p; p++, q++) | |
52 | *q = isupper (*p) ? tolower (*p) : *p; | |
53 | *q = 0; | |
54 | q = site; | |
55 | ||
56 | if (uleq (LocalName (), site)) | |
57 | return LocalName (); | |
58 | ||
59 | #ifdef BSD41A | |
60 | if (rhost (&q) != NOTOK) { | |
61 | (void) strcpy (buffer, q); | |
62 | free (q); | |
63 | return buffer; | |
64 | } | |
65 | #endif /* BSD41A */ | |
66 | #if defined(BSD42) || defined(SOCKETS) | |
67 | #ifndef BIND | |
68 | sethostent (1); | |
69 | #endif | |
70 | if (hp = gethostbyname (q)) { | |
71 | (void) strcpy (buffer, hp -> h_name); | |
72 | return buffer; | |
73 | } | |
74 | #endif /* BSD42 or SOCKETS */ | |
75 | ||
76 | if (hosts.h_name || init_hs ()) | |
77 | for (h = hosts.h_next; h; h = h -> h_next) | |
78 | if (uleq (h -> h_name, q)) | |
79 | return h -> h_name; | |
80 | else | |
81 | for (r = h -> h_aliases; *r; r++) | |
82 | if (uleq (*r, q)) | |
83 | return h -> h_name; | |
84 | ||
85 | (void) strcpy (buffer, site); | |
86 | return buffer; | |
87 | } | |
88 | ||
89 | /* \f */ | |
90 | ||
91 | /* Use hostable as an exception file for those hosts that aren't on the | |
92 | Internet (listed in /etc/hosts). These are usually PhoneNet and UUCP | |
93 | sites. */ | |
94 | ||
95 | ||
96 | #define NALIASES 50 | |
97 | ||
98 | static int init_hs () { | |
99 | register char *cp, | |
100 | *dp, | |
101 | **q, | |
102 | **r; | |
103 | char buffer[BUFSIZ], | |
104 | *aliases[NALIASES]; | |
105 | register struct host *h; | |
106 | register FILE *fp; | |
107 | ||
108 | if ((fp = fopen (hostable, "r")) == NULL) | |
109 | return 0; | |
110 | ||
111 | h = &hosts; | |
112 | while (fgets (buffer, sizeof buffer, fp) != NULL) { | |
113 | if (cp = index (buffer, '#')) | |
114 | *cp = 0; | |
115 | if (cp = index (buffer, '\n')) | |
116 | *cp = 0; | |
117 | for (cp = buffer; *cp; cp++) | |
118 | if (isspace (*cp)) | |
119 | *cp = ' '; | |
120 | for (cp = buffer; isspace (*cp); cp++) | |
121 | continue; | |
122 | if (*cp == 0) | |
123 | continue; | |
124 | ||
125 | q = aliases; | |
126 | if (cp = index (dp = cp, ' ')) { | |
127 | *cp = 0; | |
128 | for (cp++; *cp; cp++) { | |
129 | while (isspace (*cp)) | |
130 | cp++; | |
131 | if (*cp == 0) | |
132 | break; | |
133 | if (cp = index (*q++ = cp, ' ')) | |
134 | *cp = 0; | |
135 | else | |
136 | break; | |
137 | if (q >= aliases + NALIASES) | |
138 | break; | |
139 | } | |
140 | } | |
141 | ||
142 | *q = 0; | |
143 | ||
144 | h -> h_next = (struct host *) calloc (1, sizeof *h); | |
145 | h = h -> h_next; | |
146 | h -> h_name = getcpy (dp); | |
147 | r = h -> h_aliases = | |
148 | (char **) calloc ((unsigned) (q - aliases + 1), sizeof *q); | |
149 | for (q = aliases; *q; q++) | |
150 | *r++ = getcpy (*q); | |
151 | *r = 0; | |
152 | } | |
153 | ||
154 | (void) fclose (fp); | |
155 | return 1; | |
156 | } |