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net.c revision 1.6 
      1 /*
      2  * Copyright (c) 1989 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #ifndef lint
     38 /*static char sccsid[] = "from: @(#)net.c	5.5 (Berkeley) 6/1/90";*/
     39 static char rcsid[] = "$Id: net.c,v 1.6 1995/05/21 15:06:52 mycroft Exp $";
     40 #endif /* not lint */
     41 
     42 #include <sys/types.h>
     43 #include <sys/socket.h>
     44 #include <netinet/in.h>
     45 #include <arpa/inet.h>
     46 #include <netdb.h>
     47 #include <stdio.h>
     48 #include <string.h>
     49 #include <ctype.h>
     50 
     51 netfinger(name)
     52 	char *name;
     53 {
     54 	extern int lflag;
     55 	register FILE *fp;
     56 	register int c, lastc;
     57 	struct hostent *hp, def;
     58 	struct servent *sp;
     59 	struct sockaddr_in sin;
     60 	int s;
     61 	char *alist[1], *host, *rindex();
     62 
     63 	if (!(host = rindex(name, '@')))
     64 		return;
     65 	*host++ = NULL;
     66 	if (inet_aton(host, &sin.sin_addr) == 0) {
     67 		hp = gethostbyname(host);
     68 		if (hp == 0) {
     69 			(void)fprintf(stderr,
     70 			    "finger: unknown host: %s\n", host);
     71 			return;
     72 		}
     73 		sin.sin_family = hp->h_addrtype;
     74 		bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
     75 		host = hp->h_name;
     76 	} else
     77 		sin.sin_family = AF_INET;
     78 	if (!(sp = getservbyname("finger", "tcp"))) {
     79 		(void)fprintf(stderr, "finger: tcp/finger: unknown service\n");
     80 		return;
     81 	}
     82 	sin.sin_port = sp->s_port;
     83 	if ((s = socket(sin.sin_family, SOCK_STREAM, 0)) < 0) {
     84 		perror("finger: socket");
     85 		return;
     86 	}
     87 
     88 	/* have network connection; identify the host connected with */
     89 	(void)printf("[%s]\n", host);
     90 	if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
     91 		perror("finger: connect");
     92 		(void)close(s);
     93 		return;
     94 	}
     95 
     96 	/* -l flag for remote fingerd  */
     97 	if (lflag)
     98 		write(s, "/W ", 3);
     99 	/* send the name followed by <CR><LF> */
    100 	(void)write(s, name, strlen(name));
    101 	(void)write(s, "\r\n", 2);
    102 
    103 	/*
    104 	 * Read from the remote system; once we're connected, we assume some
    105 	 * data.  If none arrives, we hang until the user interrupts.
    106 	 *
    107 	 * If we see a <CR> or a <CR> with the high bit set, treat it as
    108 	 * a newline; if followed by a newline character, only output one
    109 	 * newline.
    110 	 *
    111 	 * Otherwise, all high bits are stripped; if it isn't printable and
    112 	 * it isn't a space, we can simply set the 7th bit.  Every ASCII
    113 	 * character with bit 7 set is printable.
    114 	 */
    115 	if (fp = fdopen(s, "r"))
    116 		while ((c = getc(fp)) != EOF) {
    117 			c &= 0x7f;
    118 			if (c == '\r') {
    119 				if (lastc == '\r')
    120 					continue;
    121 				c = '\n';
    122 				lastc = '\r';
    123 			} else {
    124 				if (!isprint(c) && !isspace(c))
    125 					c |= 0x40;
    126 				if (lastc != '\r' || c != '\n')
    127 					lastc = c;
    128 				else {
    129 					lastc = '\n';
    130 					continue;
    131 				}
    132 			}
    133 			putchar(c);
    134 		}
    135 	if (lastc != '\n')
    136 		putchar('\n');
    137 	(void)fclose(fp);
    138 }
    139