11590Srgrimes/* 21590Srgrimes * Copyright (c) 1989, 1993 31590Srgrimes * The Regents of the University of California. All rights reserved. 41590Srgrimes * 51590Srgrimes * This code is derived from software contributed to Berkeley by 61590Srgrimes * Tony Nardo of the Johns Hopkins University/Applied Physics Lab. 71590Srgrimes * 81590Srgrimes * Redistribution and use in source and binary forms, with or without 91590Srgrimes * modification, are permitted provided that the following conditions 101590Srgrimes * are met: 111590Srgrimes * 1. Redistributions of source code must retain the above copyright 121590Srgrimes * notice, this list of conditions and the following disclaimer. 131590Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141590Srgrimes * notice, this list of conditions and the following disclaimer in the 151590Srgrimes * documentation and/or other materials provided with the distribution. 161590Srgrimes * 4. Neither the name of the University nor the names of its contributors 171590Srgrimes * may be used to endorse or promote products derived from this software 181590Srgrimes * without specific prior written permission. 191590Srgrimes * 201590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301590Srgrimes * SUCH DAMAGE. 311590Srgrimes */ 321590Srgrimes 3387628Sdwmalone#if 0 3487628Sdwmalone#ifndef lint 3587628Sdwmalonestatic char sccsid[] = "@(#)net.c 8.4 (Berkeley) 4/28/95"; 3687628Sdwmalone#endif 3787628Sdwmalone#endif 3887628Sdwmalone 3987229Smarkm#include <sys/cdefs.h> 4087229Smarkm__FBSDID("$FreeBSD$"); 4187229Smarkm 4236792Simp#include <sys/param.h> 431590Srgrimes#include <sys/socket.h> 4472109Scharnier#include <sys/uio.h> 4572109Scharnier#include <ctype.h> 461590Srgrimes#include <db.h> 4727169Scharnier#include <err.h> 4872109Scharnier#include <netdb.h> 491590Srgrimes#include <pwd.h> 501590Srgrimes#include <stdio.h> 5178718Sdd#include <stdlib.h> 521590Srgrimes#include <string.h> 5372109Scharnier#include <unistd.h> 54202191Sed#include <utmpx.h> 551590Srgrimes#include "finger.h" 561590Srgrimes 57129302Sstefanfstatic void cleanup(int sig); 5866199Swollmanstatic int do_protocol(const char *name, const struct addrinfo *ai); 5966199Swollmanstatic void trying(const struct addrinfo *ai); 6066199Swollman 6146662Sobrienvoid 62102944Sdwmalonenetfinger(char *name) 631590Srgrimes{ 6466199Swollman int error, multi; 6566199Swollman char *host; 6666199Swollman struct addrinfo *ai, *ai0; 6766199Swollman static struct addrinfo hint; 681590Srgrimes 6966199Swollman host = strrchr(name, '@'); 7066199Swollman if (host == 0) 711590Srgrimes return; 7227169Scharnier *host++ = '\0'; 7346662Sobrien signal(SIGALRM, cleanup); 7466199Swollman alarm(TIME_LIMIT); 7566199Swollman 7666199Swollman hint.ai_flags = AI_CANONNAME; 77100521Sume hint.ai_family = family; 7866199Swollman hint.ai_socktype = SOCK_STREAM; 7966199Swollman 8066199Swollman error = getaddrinfo(host, "finger", &hint, &ai0); 8166199Swollman if (error) { 8266199Swollman warnx("%s: %s", host, gai_strerror(error)); 831590Srgrimes return; 841590Srgrimes } 8566199Swollman 8666199Swollman multi = (ai0->ai_next) != 0; 8766199Swollman 8866315Swollman /* ai_canonname may not be filled in if the user specified an IP. */ 8966315Swollman if (ai0->ai_canonname == 0) 9066315Swollman printf("[%s]\n", host); 9166315Swollman else 9266315Swollman printf("[%s]\n", ai0->ai_canonname); 9366315Swollman 9466199Swollman for (ai = ai0; ai != 0; ai = ai->ai_next) { 9566199Swollman if (multi) 9666199Swollman trying(ai); 9766199Swollman 9866199Swollman error = do_protocol(name, ai); 9966199Swollman if (!error) 10066199Swollman break; 1011590Srgrimes } 10266199Swollman alarm(0); 10366199Swollman freeaddrinfo(ai0); 10466199Swollman} 10566199Swollman 10666199Swollmanstatic int 10766199Swollmando_protocol(const char *name, const struct addrinfo *ai) 10866199Swollman{ 10967467Sru int cnt, line_len, s; 11087229Smarkm FILE *fp; 11187229Smarkm int c, lastc; 11266199Swollman struct iovec iov[3]; 11366199Swollman struct msghdr msg; 11487229Smarkm static char slash_w[] = "/W "; 115107528Sroam static char neteol[] = "\r\n"; 11666199Swollman 11766199Swollman s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 11866199Swollman if (s < 0) { 11966199Swollman warn("socket(%d, %d, %d)", ai->ai_family, ai->ai_socktype, 12066199Swollman ai->ai_protocol); 12166199Swollman return -1; 1221590Srgrimes } 1231590Srgrimes 12466199Swollman msg.msg_name = (void *)ai->ai_addr; 12566199Swollman msg.msg_namelen = ai->ai_addrlen; 12612909Swollman msg.msg_iov = iov; 12712909Swollman msg.msg_iovlen = 0; 12812909Swollman msg.msg_control = 0; 12912909Swollman msg.msg_controllen = 0; 13027835Swollman msg.msg_flags = 0; 13112909Swollman 1321590Srgrimes /* -l flag for remote fingerd */ 13312909Swollman if (lflag) { 13487229Smarkm iov[msg.msg_iovlen].iov_base = slash_w; 13512909Swollman iov[msg.msg_iovlen++].iov_len = 3; 13612909Swollman } 1371590Srgrimes /* send the name followed by <CR><LF> */ 13887229Smarkm iov[msg.msg_iovlen].iov_base = strdup(name); 13912909Swollman iov[msg.msg_iovlen++].iov_len = strlen(name); 14087229Smarkm iov[msg.msg_iovlen].iov_base = neteol; 14112909Swollman iov[msg.msg_iovlen++].iov_len = 2; 1421590Srgrimes 143168632Sdes if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) { 14466199Swollman warn("connect"); 14566199Swollman close(s); 14666199Swollman return -1; 14714631Solah } 14814631Solah 14927835Swollman if (sendmsg(s, &msg, 0) < 0) { 15066199Swollman warn("sendmsg"); 15112909Swollman close(s); 15266199Swollman return -1; 15312909Swollman } 15412909Swollman 1551590Srgrimes /* 1561590Srgrimes * Read from the remote system; once we're connected, we assume some 1571590Srgrimes * data. If none arrives, we hang until the user interrupts. 1581590Srgrimes * 1591590Srgrimes * If we see a <CR> or a <CR> with the high bit set, treat it as 1601590Srgrimes * a newline; if followed by a newline character, only output one 1611590Srgrimes * newline. 1621590Srgrimes * 1631590Srgrimes * Otherwise, all high bits are stripped; if it isn't printable and 1641590Srgrimes * it isn't a space, we can simply set the 7th bit. Every ASCII 1651590Srgrimes * character with bit 7 set is printable. 1668874Srgrimes */ 16723693Speter lastc = 0; 16823693Speter if ((fp = fdopen(s, "r")) != NULL) { 16946662Sobrien cnt = 0; 17046662Sobrien line_len = 0; 1711590Srgrimes while ((c = getc(fp)) != EOF) { 17246662Sobrien if (++cnt > OUTPUT_MAX) { 17346662Sobrien printf("\n\n Output truncated at %d bytes...\n", 17446662Sobrien cnt - 1); 17546662Sobrien break; 17646662Sobrien } 1771590Srgrimes if (c == 0x0d) { 1781590Srgrimes if (lastc == '\r') /* ^M^M - skip dupes */ 1791590Srgrimes continue; 1801590Srgrimes c = '\n'; 1811590Srgrimes lastc = '\r'; 1821590Srgrimes } else { 18314472Sache if (!isprint(c) && !isspace(c)) { 18414472Sache c &= 0x7f; 1851590Srgrimes c |= 0x40; 18614472Sache } 1871590Srgrimes if (lastc != '\r' || c != '\n') 1881590Srgrimes lastc = c; 1891590Srgrimes else { 1901590Srgrimes lastc = '\n'; 1911590Srgrimes continue; 1921590Srgrimes } 1931590Srgrimes } 1941590Srgrimes putchar(c); 19546662Sobrien if (c != '\n' && ++line_len > _POSIX2_LINE_MAX) { 19646662Sobrien putchar('\\'); 19746662Sobrien putchar('\n'); 19846662Sobrien lastc = '\r'; 19946662Sobrien } 20046662Sobrien if (lastc == '\n' || lastc == '\r') 20146662Sobrien line_len = 0; 2021590Srgrimes } 20312909Swollman if (ferror(fp)) { 20412909Swollman /* 20512909Swollman * Assume that whatever it was set errno... 20612909Swollman */ 20766199Swollman warn("reading from network"); 20812909Swollman } 20966199Swollman if (lastc != '\n') 21066199Swollman putchar('\n'); 21166199Swollman 21266199Swollman fclose(fp); 21312909Swollman } 21466199Swollman return 0; 2151590Srgrimes} 21666199Swollman 21766199Swollmanstatic void 21866199Swollmantrying(const struct addrinfo *ai) 21966199Swollman{ 22066199Swollman char buf[NI_MAXHOST]; 22166199Swollman 22266199Swollman if (getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof buf, 22366199Swollman (char *)0, 0, NI_NUMERICHOST) != 0) 22466199Swollman return; /* XXX can't happen */ 22566199Swollman 22666199Swollman printf("Trying %s...\n", buf); 22766199Swollman} 22866199Swollman 229223374Sdelphijstatic void 23087229Smarkmcleanup(int sig __unused) 23166199Swollman{ 23266199Swollman#define ERRSTR "Timed out.\n" 23366199Swollman write(STDERR_FILENO, ERRSTR, sizeof ERRSTR); 23466199Swollman exit(1); 23566199Swollman} 23666199Swollman 237