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1 | /* |
2 | * Copyright (c) 1989 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
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5 | * Redistribution and use in source and binary forms are permitted |
6 | * provided that the above copyright notice and this paragraph are | |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
16 | */ | |
17 | ||
18 | #ifndef lint | |
6f3f7e2c | 19 | static char sccsid[] = "@(#)net.c 5.2 (Berkeley) %G%"; |
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20 | #endif /* not lint */ |
21 | ||
22 | #include <sys/types.h> | |
23 | #include <sys/socket.h> | |
24 | #include <netinet/in.h> | |
25 | #include <netdb.h> | |
26 | #include <stdio.h> | |
27 | #include <ctype.h> | |
28 | ||
29 | netfinger(name) | |
30 | char *name; | |
31 | { | |
32 | extern int lflag; | |
33 | register FILE *fp; | |
34 | register int c, lastc; | |
35 | struct in_addr defaddr; | |
36 | struct hostent *hp, def; | |
37 | struct servent *sp; | |
38 | struct sockaddr_in sin; | |
39 | int s; | |
40 | char *alist[1], *host, *rindex(); | |
41 | u_long inet_addr(); | |
42 | ||
43 | if (!(host = rindex(name, '@'))) | |
44 | return; | |
45 | *host++ = NULL; | |
46 | if (!(hp = gethostbyname(host))) { | |
47 | defaddr.s_addr = inet_addr(host); | |
48 | if (defaddr.s_addr == -1) { | |
49 | (void)fprintf(stderr, | |
50 | "finger: unknown host: %s\n", host); | |
51 | return; | |
52 | } | |
53 | def.h_name = host; | |
54 | def.h_addr_list = alist; | |
55 | def.h_addr = (char *)&defaddr; | |
56 | def.h_length = sizeof(struct in_addr); | |
57 | def.h_addrtype = AF_INET; | |
58 | def.h_aliases = 0; | |
59 | hp = &def; | |
60 | } | |
61 | if (!(sp = getservbyname("finger", "tcp"))) { | |
62 | (void)fprintf(stderr, "finger: tcp/finger: unknown service\n"); | |
63 | return; | |
64 | } | |
65 | sin.sin_family = hp->h_addrtype; | |
66 | bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length); | |
67 | sin.sin_port = sp->s_port; | |
68 | if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0) { | |
69 | perror("finger: socket"); | |
70 | return; | |
71 | } | |
72 | ||
73 | /* have network connection; identify the host connected with */ | |
74 | (void)printf("[%s]\n", hp->h_name); | |
75 | if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { | |
76 | perror("finger: connect"); | |
77 | (void)close(s); | |
78 | return; | |
79 | } | |
80 | ||
81 | /* -l flag for remote fingerd */ | |
82 | if (lflag) | |
83 | write(s, "/W ", 3); | |
84 | /* send the name followed by <CR><LF> */ | |
85 | (void)write(s, name, strlen(name)); | |
86 | (void)write(s, "\r\n", 2); | |
87 | ||
88 | /* | |
89 | * read back what we get from the remote system. | |
90 | * | |
91 | * Note: once we connected to the remote site, we assume some data. | |
92 | * If it can't/won't send any data, we hang here until Mr. User | |
93 | * gets sufficiently bored to hit ^C. | |
94 | * | |
95 | * Some systems use the return key as a line terminator. These | |
96 | * systems tend to also set the parity bit on every byte. If we | |
97 | * see a <CR> with the 8th bit set, treat it as a newline character. | |
98 | * 0x8d == <CR> with high bit set. | |
99 | * | |
100 | * Otherwise, all high bits are stripped; if it isn't printable and | |
101 | * it isn't a space, we can simply set the 7th bit. Every ASCII | |
102 | * character with bit 7 set is printable. | |
103 | */ | |
104 | if (fp = fdopen(s, "r")) | |
105 | while ((c = getc(fp)) != EOF) { | |
106 | if (c == 0x8d) | |
107 | c = '\n'; | |
108 | c &= 0x7f; | |
109 | if (!isprint(c) && !isspace(c)) | |
110 | c |= 0x40; | |
111 | lastc = c; | |
112 | putchar(c); | |
113 | } | |
114 | if (lastc != '\n') | |
115 | putchar('\n'); | |
116 | (void)fclose(fp); | |
117 | } |