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net.c revision 1.7 
      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 1.7 1996/11/21 06:01:50 lukem 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 #include <unistd.h>
     51 #include "finger.h"
     52 #include "extern.h"
     53 
     54 void
     55 netfinger(name)
     56 	char *name;
     57 {
     58 	FILE *fp;
     59 	int c, lastc;
     60 	struct hostent *hp;
     61 	struct servent *sp;
     62 	struct sockaddr_in sin;
     63 	int s;
     64 	char *host;
     65 
     66 	lastc = 0;
     67 	if (!(host = strrchr(name, '@')))
     68 		return;
     69 	*host++ = NULL;
     70 	if (inet_aton(host, &sin.sin_addr) == 0) {
     71 		hp = gethostbyname(host);
     72 		if (hp == 0) {
     73 			(void)fprintf(stderr,
     74 			    "finger: unknown host: %s\n", host);
     75 			return;
     76 		}
     77 		sin.sin_family = hp->h_addrtype;
     78 		bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
     79 		host = hp->h_name;
     80 	} else
     81 		sin.sin_family = AF_INET;
     82 	if (!(sp = getservbyname("finger", "tcp"))) {
     83 		(void)fprintf(stderr, "finger: tcp/finger: unknown service\n");
     84 		return;
     85 	}
     86 	sin.sin_port = sp->s_port;
     87 	if ((s = socket(sin.sin_family, SOCK_STREAM, 0)) < 0) {
     88 		perror("finger: socket");
     89 		return;
     90 	}
     91 
     92 	/* have network connection; identify the host connected with */
     93 	(void)printf("[%s]\n", host);
     94 	if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
     95 		perror("finger: connect");
     96 		(void)close(s);
     97 		return;
     98 	}
     99 
    100 	/* -l flag for remote fingerd  */
    101 	if (lflag)
    102 		write(s, "/W ", 3);
    103 	/* send the name followed by <CR><LF> */
    104 	(void)write(s, name, strlen(name));
    105 	(void)write(s, "\r\n", 2);
    106 
    107 	/*
    108 	 * Read from the remote system; once we're connected, we assume some
    109 	 * data.  If none arrives, we hang until the user interrupts.
    110 	 *
    111 	 * If we see a <CR> or a <CR> with the high bit set, treat it as
    112 	 * a newline; if followed by a newline character, only output one
    113 	 * newline.
    114 	 *
    115 	 * Otherwise, all high bits are stripped; if it isn't printable and
    116 	 * it isn't a space, we can simply set the 7th bit.  Every ASCII
    117 	 * character with bit 7 set is printable.
    118 	 */
    119 	if ((fp = fdopen(s, "r")) != NULL)
    120 		while ((c = getc(fp)) != EOF) {
    121 			c &= 0x7f;
    122 			if (c == '\r') {
    123 				if (lastc == '\r')
    124 					continue;
    125 				c = '\n';
    126 				lastc = '\r';
    127 			} else {
    128 				if (!isprint(c) && !isspace(c))
    129 					c |= 0x40;
    130 				if (lastc != '\r' || c != '\n')
    131 					lastc = c;
    132 				else {
    133 					lastc = '\n';
    134 					continue;
    135 				}
    136 			}
    137 			putchar(c);
    138 		}
    139 	if (lastc != '\n')
    140 		putchar('\n');
    141 	(void)fclose(fp);
    142 }
    143