148 lines
4.5 KiB
C
148 lines
4.5 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)net.c 8.3 (Berkeley) 1/2/94";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <db.h>
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#include <unistd.h>
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#include <pwd.h>
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#include <utmp.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include "finger.h"
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void
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netfinger(name)
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char *name;
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{
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extern int lflag;
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register FILE *fp;
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register int c, lastc;
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struct in_addr defaddr;
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struct hostent *hp, def;
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struct servent *sp;
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struct sockaddr_in sin;
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int s;
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char *alist[1], *host;
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if (!(host = rindex(name, '@')))
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return;
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*host++ = NULL;
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if (isdigit(*host) && (defaddr.s_addr = inet_addr(host)) != -1) {
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def.h_name = host;
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def.h_addr_list = alist;
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def.h_addr = (char *)&defaddr;
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def.h_length = sizeof(struct in_addr);
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def.h_addrtype = AF_INET;
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def.h_aliases = 0;
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hp = &def;
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} else if (!(hp = gethostbyname(host))) {
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(void)fprintf(stderr,
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"finger: unknown host: %s\n", host);
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return;
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}
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if (!(sp = getservbyname("finger", "tcp"))) {
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(void)fprintf(stderr, "finger: tcp/finger: unknown service\n");
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return;
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}
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sin.sin_family = hp->h_addrtype;
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bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
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sin.sin_port = sp->s_port;
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if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0) {
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perror("finger: socket");
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return;
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}
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/* have network connection; identify the host connected with */
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(void)printf("[%s]\n", hp->h_name);
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if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
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perror("finger: connect");
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(void)close(s);
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return;
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}
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/* -l flag for remote fingerd */
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if (lflag)
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write(s, "/W ", 3);
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/* send the name followed by <CR><LF> */
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(void)write(s, name, strlen(name));
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(void)write(s, "\r\n", 2);
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/*
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* Read from the remote system; once we're connected, we assume some
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* data. If none arrives, we hang until the user interrupts.
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*
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* If we see a <CR> or a <CR> with the high bit set, treat it as
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* a newline; if followed by a newline character, only output one
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* newline.
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*
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* Otherwise, all high bits are stripped; if it isn't printable and
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* it isn't a space, we can simply set the 7th bit. Every ASCII
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* character with bit 7 set is printable.
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*/
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if (fp = fdopen(s, "r"))
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while ((c = getc(fp)) != EOF) {
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c &= 0x7f;
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if (c == 0x0d) {
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if (lastc == '\r') /* ^M^M - skip dupes */
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continue;
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c = '\n';
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lastc = '\r';
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} else {
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if (!isprint(c) && !isspace(c))
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c |= 0x40;
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if (lastc != '\r' || c != '\n')
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lastc = c;
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else {
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lastc = '\n';
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continue;
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}
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}
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putchar(c);
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}
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if (lastc != '\n')
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putchar('\n');
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(void)fclose(fp);
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}
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