Annotation of src/usr.bin/finger/net.c, Revision 1.5
1.5 ! kstailey 1: /* $OpenBSD: net.c,v 1.4 1997/04/23 19:17:29 millert Exp $ */
1.2 deraadt 2:
1.1 deraadt 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. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the University of
21: * California, Berkeley and its contributors.
22: * 4. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: */
38:
39: #ifndef lint
40: /*static char sccsid[] = "from: @(#)net.c 5.5 (Berkeley) 6/1/90";*/
1.5 ! kstailey 41: static char rcsid[] = "$OpenBSD: net.c,v 1.4 1997/04/23 19:17:29 millert Exp $";
1.1 deraadt 42: #endif /* not lint */
43:
44: #include <sys/types.h>
45: #include <sys/socket.h>
46: #include <netinet/in.h>
47: #include <arpa/inet.h>
48: #include <netdb.h>
49: #include <stdio.h>
50: #include <string.h>
51: #include <ctype.h>
1.5 ! kstailey 52: #include <unistd.h>
! 53: #include "finger.h"
! 54: #include "extern.h"
1.1 deraadt 55:
1.5 ! kstailey 56: void
1.1 deraadt 57: netfinger(name)
58: char *name;
59: {
1.5 ! kstailey 60: FILE *fp;
! 61: int c, lastc;
! 62: struct hostent *hp;
1.1 deraadt 63: struct servent *sp;
64: struct sockaddr_in sin;
65: int s;
1.5 ! kstailey 66: char *host;
1.1 deraadt 67:
1.5 ! kstailey 68: lastc = 0;
1.3 millert 69: if (!(host = strrchr(name, '@')))
1.1 deraadt 70: return;
1.5 ! kstailey 71: *host++ = '\0';
1.1 deraadt 72: if (inet_aton(host, &sin.sin_addr) == 0) {
73: hp = gethostbyname(host);
74: if (hp == 0) {
75: (void)fprintf(stderr,
76: "finger: unknown host: %s\n", host);
77: return;
78: }
79: sin.sin_family = hp->h_addrtype;
80: bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
81: host = hp->h_name;
82: } else
83: sin.sin_family = AF_INET;
84: if (!(sp = getservbyname("finger", "tcp"))) {
85: (void)fprintf(stderr, "finger: tcp/finger: unknown service\n");
86: return;
87: }
88: sin.sin_port = sp->s_port;
89: if ((s = socket(sin.sin_family, SOCK_STREAM, 0)) < 0) {
90: perror("finger: socket");
91: return;
92: }
93:
94: /* have network connection; identify the host connected with */
95: (void)printf("[%s]\n", host);
96: if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
97: perror("finger: connect");
98: (void)close(s);
99: return;
100: }
101:
102: /* -l flag for remote fingerd */
103: if (lflag)
104: write(s, "/W ", 3);
105: /* send the name followed by <CR><LF> */
106: (void)write(s, name, strlen(name));
107: (void)write(s, "\r\n", 2);
108:
109: /*
110: * Read from the remote system; once we're connected, we assume some
111: * data. If none arrives, we hang until the user interrupts.
112: *
113: * If we see a <CR> or a <CR> with the high bit set, treat it as
114: * a newline; if followed by a newline character, only output one
115: * newline.
116: *
117: * Otherwise, all high bits are stripped; if it isn't printable and
118: * it isn't a space, we can simply set the 7th bit. Every ASCII
119: * character with bit 7 set is printable.
1.5 ! kstailey 120: */
! 121: if ((fp = fdopen(s, "r")) != NULL)
1.1 deraadt 122: while ((c = getc(fp)) != EOF) {
123: c &= 0x7f;
124: if (c == '\r') {
125: if (lastc == '\r')
126: continue;
127: c = '\n';
128: lastc = '\r';
129: } else {
130: if (!isprint(c) && !isspace(c))
131: c |= 0x40;
132: if (lastc != '\r' || c != '\n')
133: lastc = c;
134: else {
135: lastc = '\n';
136: continue;
137: }
138: }
139: putchar(c);
140: }
141: if (lastc != '\n')
142: putchar('\n');
143: (void)fclose(fp);
144: }
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