241 lines
6.1 KiB
C
241 lines
6.1 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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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)net.c 8.4 (Berkeley) 4/28/95";
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#endif
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <ctype.h>
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#include <db.h>
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#include <err.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <utmp.h>
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#include "finger.h"
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static void cleanup(int sig);
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static int do_protocol(const char *name, const struct addrinfo *ai);
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static void trying(const struct addrinfo *ai);
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void
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netfinger(char *name)
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{
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int error, multi;
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char *host;
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struct addrinfo *ai, *ai0;
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static struct addrinfo hint;
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host = strrchr(name, '@');
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if (host == 0)
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return;
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*host++ = '\0';
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signal(SIGALRM, cleanup);
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alarm(TIME_LIMIT);
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hint.ai_flags = AI_CANONNAME;
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hint.ai_family = family;
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hint.ai_socktype = SOCK_STREAM;
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error = getaddrinfo(host, "finger", &hint, &ai0);
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if (error) {
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warnx("%s: %s", host, gai_strerror(error));
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return;
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}
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multi = (ai0->ai_next) != 0;
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/* ai_canonname may not be filled in if the user specified an IP. */
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if (ai0->ai_canonname == 0)
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printf("[%s]\n", host);
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else
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printf("[%s]\n", ai0->ai_canonname);
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for (ai = ai0; ai != 0; ai = ai->ai_next) {
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if (multi)
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trying(ai);
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error = do_protocol(name, ai);
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if (!error)
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break;
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}
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alarm(0);
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freeaddrinfo(ai0);
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}
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static int
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do_protocol(const char *name, const struct addrinfo *ai)
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{
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int cnt, line_len, s;
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FILE *fp;
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int c, lastc;
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struct iovec iov[3];
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struct msghdr msg;
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static char slash_w[] = "/W ";
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static char neteol[] = "\r\n";
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s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
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if (s < 0) {
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warn("socket(%d, %d, %d)", ai->ai_family, ai->ai_socktype,
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ai->ai_protocol);
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return -1;
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}
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msg.msg_name = (void *)ai->ai_addr;
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msg.msg_namelen = ai->ai_addrlen;
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msg.msg_iov = iov;
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msg.msg_iovlen = 0;
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msg.msg_control = 0;
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msg.msg_controllen = 0;
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msg.msg_flags = 0;
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/* -l flag for remote fingerd */
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if (lflag) {
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iov[msg.msg_iovlen].iov_base = slash_w;
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iov[msg.msg_iovlen++].iov_len = 3;
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}
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/* send the name followed by <CR><LF> */
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iov[msg.msg_iovlen].iov_base = strdup(name);
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iov[msg.msg_iovlen++].iov_len = strlen(name);
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iov[msg.msg_iovlen].iov_base = neteol;
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iov[msg.msg_iovlen++].iov_len = 2;
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if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
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warn("connect");
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close(s);
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return -1;
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}
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if (sendmsg(s, &msg, 0) < 0) {
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warn("sendmsg");
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close(s);
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return -1;
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}
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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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lastc = 0;
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if ((fp = fdopen(s, "r")) != NULL) {
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cnt = 0;
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line_len = 0;
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while ((c = getc(fp)) != EOF) {
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if (++cnt > OUTPUT_MAX) {
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printf("\n\n Output truncated at %d bytes...\n",
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cnt - 1);
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break;
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}
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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 &= 0x7f;
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c |= 0x40;
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}
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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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if (c != '\n' && ++line_len > _POSIX2_LINE_MAX) {
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putchar('\\');
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putchar('\n');
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lastc = '\r';
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}
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if (lastc == '\n' || lastc == '\r')
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line_len = 0;
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}
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if (ferror(fp)) {
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/*
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* Assume that whatever it was set errno...
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*/
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warn("reading from network");
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}
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if (lastc != '\n')
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putchar('\n');
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fclose(fp);
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}
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return 0;
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}
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static void
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trying(const struct addrinfo *ai)
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{
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char buf[NI_MAXHOST];
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if (getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof buf,
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(char *)0, 0, NI_NUMERICHOST) != 0)
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return; /* XXX can't happen */
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printf("Trying %s...\n", buf);
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}
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void
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cleanup(int sig __unused)
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{
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#define ERRSTR "Timed out.\n"
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write(STDERR_FILENO, ERRSTR, sizeof ERRSTR);
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exit(1);
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}
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