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Commit | Line | Data |
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56a69e4e | 1 | /* |
2 | * $Source$ | |
3 | * $Author$ | |
4 | * $Header$ | |
5 | * | |
6 | * Copyright (C) 1987 by the Massachusetts Institute of Technology | |
babbc197 | 7 | * For copying and distribution information, please see the file |
8 | * <mit-copyright.h>. | |
56a69e4e | 9 | */ |
10 | ||
11 | #ifndef lint | |
12 | static char *rcsid_fixhost_c = "$Header$"; | |
13 | #endif lint | |
14 | ||
babbc197 | 15 | #include <mit-copyright.h> |
56a69e4e | 16 | #include <sys/types.h> |
17 | #include <sys/socket.h> | |
18 | #include <netinet/in.h> | |
19 | #include <arpa/nameser.h> | |
20 | #include <arpa/resolv.h> | |
21 | #include <netdb.h> | |
22 | #include <stdio.h> | |
23 | #include <strings.h> | |
24 | #include <ctype.h> | |
25 | ||
26 | extern char *malloc(); | |
27 | extern char *realloc(); | |
28 | extern char *strsave(); | |
29 | ||
30 | /* | |
00bfb581 | 31 | * Canonicalize hostname: |
32 | * if it is in double-quotes, then strip the quotes and return the name. | |
33 | * if it is in the namespace, call the nameserver to expand it | |
34 | * otherwise uppercase it and append the default domain (using an, er, | |
35 | * undocumented global of the nameserver). | |
56a69e4e | 36 | * |
37 | * Assumes that host was allocated using malloc(); it may be freed or | |
38 | * realloc'ed, so the old pointer should not be considered valid. | |
39 | */ | |
40 | ||
41 | char * | |
42 | canonicalize_hostname(host) | |
43 | char *host; | |
44 | { | |
45 | register struct hostent *hp; | |
46 | int n_len; | |
47 | int has_dot = 0; | |
48 | char tbuf[BUFSIZ]; | |
49 | register char *cp; | |
50 | ||
00bfb581 | 51 | if (strlen(host) > 2 && host[0] == '"' && host[strlen(host)-1] == '"') { |
7fb8be7f | 52 | strcpy(tbuf, host+1); |
00bfb581 | 53 | free(host); |
54 | tbuf[strlen(tbuf)-1] = 0; | |
55 | return(strsave(tbuf)); | |
56 | } | |
57 | ||
277817a5 | 58 | if (index(host, '*') || index(host, '?')) |
59 | return(host); | |
60 | ||
56a69e4e | 61 | hp = gethostbyname(host); |
62 | ||
63 | if (hp) { | |
64 | n_len = strlen(hp->h_name) + 1; | |
65 | host = realloc(host, (unsigned)n_len); | |
66 | ||
67 | (void) strcpy(host, hp->h_name); | |
68 | return host; | |
69 | } else { | |
70 | /* can't get name from nameserver; fix up the format a bit */ | |
71 | for (cp = host; *cp; cp++) { | |
72 | register int c; /* pcc doesn't like register char */ | |
73 | if (islower(c = *cp)) *cp = toupper(c); | |
74 | has_dot |= (c == '.'); | |
75 | } | |
76 | if (!has_dot) { | |
77 | (void) sprintf(tbuf, "%s.%s", host, _res.defdname); | |
78 | free(host); | |
79 | host = strsave(tbuf); | |
80 | } | |
81 | return host; | |
82 | } | |
83 | } |