1 /* $OpenBSD: net.c,v 1.10 2004/03/15 02:50:29 tedu Exp $ */
2
3 /*
4 * Copyright (c) 1989 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #ifndef lint
36 /*static char sccsid[] = "from: @(#)net.c 5.5 (Berkeley) 6/1/90";*/
37 static const char rcsid[] = "$OpenBSD: net.c,v 1.10 2004/03/15 02:50:29 tedu Exp $";
38 #endif /* not lint */
39
40 #include <sys/types.h>
41 #include <sys/socket.h>
42 #include <netinet/in.h>
43 #include <arpa/inet.h>
44 #include <netdb.h>
45 #include <stdio.h>
46 #include <string.h>
47 #include <ctype.h>
48 #include <unistd.h>
49 #include <err.h>
50 #include "finger.h"
51 #include "extern.h"
52
53 void
netfinger(name)54 netfinger(name)
55 char *name;
56 {
57 FILE *fp;
58 int c, lastc;
59 int s;
60 char *host;
61 struct addrinfo hints, *res0, *res;
62 int error;
63 char hbuf[NI_MAXHOST];
64
65 lastc = 0;
66 if (!(host = strrchr(name, '@')))
67 return;
68 *host++ = '\0';
69 memset(&hints, 0, sizeof(hints));
70 hints.ai_family = PF_UNSPEC;
71 hints.ai_socktype = SOCK_STREAM;
72 error = getaddrinfo(host, "finger", &hints, &res0);
73 if (error) {
74 warnx("%s", gai_strerror(error));
75 return;
76 }
77
78 s = -1;
79 for (res = res0; res; res = res->ai_next) {
80 if ((s = socket(res->ai_family, res->ai_socktype,
81 res->ai_protocol)) < 0) {
82 continue;
83 }
84 if (connect(s, res->ai_addr, res->ai_addrlen) < 0) {
85 (void)close(s);
86 s = -1;
87 continue;
88 }
89
90 break;
91 }
92
93 if (s < 0) {
94 perror("finger");
95 freeaddrinfo(res0);
96 return;
97 }
98
99 /* have network connection; identify the host connected with */
100 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, sizeof(hbuf),
101 NULL, 0, NI_NUMERICHOST) != 0) {
102 strlcpy(hbuf, "(invalid)", sizeof hbuf);
103 }
104 (void)printf("[%s/%s]\n", host, hbuf);
105
106 freeaddrinfo(res0);
107
108 /* -l flag for remote fingerd */
109 if (lflag)
110 write(s, "/W ", 3);
111 /* send the name followed by <CR><LF> */
112 (void)write(s, name, strlen(name));
113 (void)write(s, "\r\n", 2);
114
115 /*
116 * Read from the remote system; once we're connected, we assume some
117 * data. If none arrives, we hang until the user interrupts.
118 *
119 * If we see a <CR> or a <CR> with the high bit set, treat it as
120 * a newline; if followed by a newline character, only output one
121 * newline.
122 *
123 * Otherwise, all high bits are stripped; if it isn't printable and
124 * it isn't a space, we can simply set the 7th bit. Every ASCII
125 * character with bit 7 set is printable.
126 */
127 if ((fp = fdopen(s, "r")) != NULL)
128 while ((c = getc(fp)) != EOF) {
129 c &= 0x7f;
130 if (c == '\r') {
131 if (lastc == '\r')
132 continue;
133 c = '\n';
134 lastc = '\r';
135 } else {
136 if (!isprint(c) && !isspace(c))
137 c |= 0x40;
138 if (lastc != '\r' || c != '\n')
139 lastc = c;
140 else {
141 lastc = '\n';
142 continue;
143 }
144 }
145 putchar(c);
146 }
147 if (lastc != '\n')
148 putchar('\n');
149 (void)fclose(fp);
150 }
151