usr/src/usr.bin/finger/net.c

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)net.c       5.5 (Berkeley) 6/1/90";
#endif /* not lint */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <ctype.h>

netfinger(name)
        char *name;
{
        extern int lflag;
        register FILE *fp;
        register int c, lastc;
        struct in_addr defaddr;
        struct hostent *hp, def;
        struct servent *sp;
        struct sockaddr_in sin;
        int s;
        char *alist[1], *host, *rindex();
        u_long inet_addr();

        if (!(host = rindex(name, '@')))
                return;
        *host++ = NULL;
        if (!(hp = gethostbyname(host))) {
                defaddr.s_addr = inet_addr(host);
                if (defaddr.s_addr == -1) {
                        (void)fprintf(stderr,
                            "finger: unknown host: %s\n", host);
                        return;
                }
                def.h_name = host;
                def.h_addr_list = alist;
                def.h_addr = (char *)&defaddr;
                def.h_length = sizeof(struct in_addr);
                def.h_addrtype = AF_INET;
                def.h_aliases = 0;
                hp = &def;
        }
        if (!(sp = getservbyname("finger", "tcp"))) {
                (void)fprintf(stderr, "finger: tcp/finger: unknown service\n");
                return;
        }
        sin.sin_family = hp->h_addrtype;
        bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
        sin.sin_port = sp->s_port;
        if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0) {
                perror("finger: socket");
                return;
        }

        /* have network connection; identify the host connected with */
        (void)printf("[%s]\n", hp->h_name);
        if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
                perror("finger: connect");
                (void)close(s);
                return;
        }

        /* -l flag for remote fingerd  */
        if (lflag)
                write(s, "/W ", 3);
        /* send the name followed by <CR><LF> */
        (void)write(s, name, strlen(name));
        (void)write(s, "\r\n", 2);

        /*
         * Read from the remote system; once we're connected, we assume some
         * data.  If none arrives, we hang until the user interrupts.
         *
         * If we see a <CR> or a <CR> with the high bit set, treat it as
         * a newline; if followed by a newline character, only output one
         * newline.
         *
         * Otherwise, all high bits are stripped; if it isn't printable and
         * it isn't a space, we can simply set the 7th bit.  Every ASCII
         * character with bit 7 set is printable.
         */
        if (fp = fdopen(s, "r"))
                while ((c = getc(fp)) != EOF) {
                        c &= 0x7f;
                        if (c == 0x0d) {
                                c = '\n';
                                lastc = '\r';
                        } else {
                                if (!isprint(c) && !isspace(c))
                                        c |= 0x40;
                                if (lastc != '\r' || c != '\n')
                                        lastc = c;
                                else {
                                        lastc = '\n';
                                        continue;
                                }
                        }
                        putchar(c);
                }
        if (lastc != '\n')
                putchar('\n');
        (void)fclose(fp);
}