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net.c revision 1.1 
      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[] = "@(#)net.c	5.5 (Berkeley) 6/1/90";
     39 #endif /* not lint */
     40 
     41 #include <sys/types.h>
     42 #include <sys/socket.h>
     43 #include <netinet/in.h>
     44 #include <netdb.h>
     45 #include <stdio.h>
     46 #include <ctype.h>
     47 
     48 netfinger(name)
     49 	char *name;
     50 {
     51 	extern int lflag;
     52 	register FILE *fp;
     53 	register int c, lastc;
     54 	struct in_addr defaddr;
     55 	struct hostent *hp, def;
     56 	struct servent *sp;
     57 	struct sockaddr_in sin;
     58 	int s;
     59 	char *alist[1], *host, *rindex();
     60 	u_long inet_addr();
     61 
     62 	if (!(host = rindex(name, '@')))
     63 		return;
     64 	*host++ = NULL;
     65 	if (!(hp = gethostbyname(host))) {
     66 		defaddr.s_addr = inet_addr(host);
     67 		if (defaddr.s_addr == -1) {
     68 			(void)fprintf(stderr,
     69 			    "finger: unknown host: %s\n", host);
     70 			return;
     71 		}
     72 		def.h_name = host;
     73 		def.h_addr_list = alist;
     74 		def.h_addr = (char *)&defaddr;
     75 		def.h_length = sizeof(struct in_addr);
     76 		def.h_addrtype = AF_INET;
     77 		def.h_aliases = 0;
     78 		hp = &def;
     79 	}
     80 	if (!(sp = getservbyname("finger", "tcp"))) {
     81 		(void)fprintf(stderr, "finger: tcp/finger: unknown service\n");
     82 		return;
     83 	}
     84 	sin.sin_family = hp->h_addrtype;
     85 	bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
     86 	sin.sin_port = sp->s_port;
     87 	if ((s = socket(hp->h_addrtype, 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", hp->h_name);
     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"))
    120 		while ((c = getc(fp)) != EOF) {
    121 			c &= 0x7f;
    122 			if (c == 0x0d) {
    123 				c = '\n';
    124 				lastc = '\r';
    125 			} else {
    126 				if (!isprint(c) && !isspace(c))
    127 					c |= 0x40;
    128 				if (lastc != '\r' || c != '\n')
    129 					lastc = c;
    130 				else {
    131 					lastc = '\n';
    132 					continue;
    133 				}
    134 			}
    135 			putchar(c);
    136 		}
    137 	if (lastc != '\n')
    138 		putchar('\n');
    139 	(void)fclose(fp);
    140 }
    141