net.c revision 66315
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 * 3. All advertising materials mentioning features or use of this software 171590Srgrimes * must display the following acknowledgement: 181590Srgrimes * This product includes software developed by the University of 191590Srgrimes * California, Berkeley and its contributors. 201590Srgrimes * 4. Neither the name of the University nor the names of its contributors 211590Srgrimes * may be used to endorse or promote products derived from this software 221590Srgrimes * without specific prior written permission. 231590Srgrimes * 241590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341590Srgrimes * SUCH DAMAGE. 351590Srgrimes */ 361590Srgrimes 371590Srgrimes#ifndef lint 3827169Scharnier#if 0 3923693Speterstatic char sccsid[] = "@(#)net.c 8.4 (Berkeley) 4/28/95"; 4027169Scharnier#else 4127169Scharnierstatic const char rcsid[] = 4250477Speter "$FreeBSD: head/usr.bin/finger/net.c 66315 2000-09-24 01:54:49Z wollman $"; 4327169Scharnier#endif 441590Srgrimes#endif /* not lint */ 451590Srgrimes 461590Srgrimes#include <sys/types.h> 4736792Simp#include <sys/param.h> 481590Srgrimes#include <sys/socket.h> 491590Srgrimes#include <netinet/in.h> 501590Srgrimes#include <arpa/inet.h> 511590Srgrimes#include <netdb.h> 521590Srgrimes#include <db.h> 5327169Scharnier#include <err.h> 541590Srgrimes#include <unistd.h> 551590Srgrimes#include <pwd.h> 561590Srgrimes#include <utmp.h> 571590Srgrimes#include <stdio.h> 581590Srgrimes#include <ctype.h> 591590Srgrimes#include <string.h> 6012909Swollman#include <sys/uio.h> 6146662Sobrien#include <signal.h> 6246662Sobrien#include <limits.h> 631590Srgrimes#include "finger.h" 641590Srgrimes 6566199Swollmanextern int lflag; /* XXX finger.h? */ 6666199Swollmanextern int Tflag; /* XXX finger.h? */ 6746662Sobrien 6866199Swollmanstatic void cleanup(int sig);; 6966199Swollmanstatic int do_protocol(const char *name, const struct addrinfo *ai); 7066199Swollmanstatic void trying(const struct addrinfo *ai); 7166199Swollman 7246662Sobrienvoid 731590Srgrimesnetfinger(name) 741590Srgrimes char *name; 751590Srgrimes{ 7666199Swollman int error, multi; 7766199Swollman char *host; 7866199Swollman struct addrinfo *ai, *ai0; 7966199Swollman static struct addrinfo hint; 801590Srgrimes 8166199Swollman host = strrchr(name, '@'); 8266199Swollman if (host == 0) 831590Srgrimes return; 8427169Scharnier *host++ = '\0'; 8546662Sobrien signal(SIGALRM, cleanup); 8666199Swollman alarm(TIME_LIMIT); 8766199Swollman 8866199Swollman hint.ai_flags = AI_CANONNAME; 8966199Swollman hint.ai_family = PF_UNSPEC; 9066199Swollman hint.ai_socktype = SOCK_STREAM; 9166199Swollman 9266199Swollman error = getaddrinfo(host, "finger", &hint, &ai0); 9366199Swollman if (error) { 9466199Swollman warnx("%s: %s", host, gai_strerror(error)); 951590Srgrimes return; 961590Srgrimes } 9766199Swollman 9866199Swollman multi = (ai0->ai_next) != 0; 9966199Swollman 10066315Swollman /* ai_canonname may not be filled in if the user specified an IP. */ 10166315Swollman if (ai0->ai_canonname == 0) 10266315Swollman printf("[%s]\n", host); 10366315Swollman else 10466315Swollman printf("[%s]\n", ai0->ai_canonname); 10566315Swollman 10666199Swollman for (ai = ai0; ai != 0; ai = ai->ai_next) { 10766199Swollman if (multi) 10866199Swollman trying(ai); 10966199Swollman 11066199Swollman error = do_protocol(name, ai); 11166199Swollman if (!error) 11266199Swollman break; 1131590Srgrimes } 11466199Swollman alarm(0); 11566199Swollman freeaddrinfo(ai0); 11666199Swollman} 11766199Swollman 11866199Swollmanstatic int 11966199Swollmando_protocol(const char *name, const struct addrinfo *ai) 12066199Swollman{ 12166199Swollman int cnt, error, line_len, s; 12266199Swollman register FILE *fp; 12366199Swollman register int c, lastc; 12466199Swollman struct iovec iov[3]; 12566199Swollman struct msghdr msg; 12666199Swollman 12766199Swollman s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 12866199Swollman if (s < 0) { 12966199Swollman warn("socket(%d, %d, %d)", ai->ai_family, ai->ai_socktype, 13066199Swollman ai->ai_protocol); 13166199Swollman return -1; 1321590Srgrimes } 1331590Srgrimes 13466199Swollman msg.msg_name = (void *)ai->ai_addr; 13566199Swollman msg.msg_namelen = ai->ai_addrlen; 13612909Swollman msg.msg_iov = iov; 13712909Swollman msg.msg_iovlen = 0; 13812909Swollman msg.msg_control = 0; 13912909Swollman msg.msg_controllen = 0; 14027835Swollman msg.msg_flags = 0; 14112909Swollman 1421590Srgrimes /* -l flag for remote fingerd */ 14312909Swollman if (lflag) { 14412909Swollman iov[msg.msg_iovlen].iov_base = "/W "; 14512909Swollman iov[msg.msg_iovlen++].iov_len = 3; 14612909Swollman } 1471590Srgrimes /* send the name followed by <CR><LF> */ 14812909Swollman iov[msg.msg_iovlen].iov_base = name; 14912909Swollman iov[msg.msg_iovlen++].iov_len = strlen(name); 15012909Swollman iov[msg.msg_iovlen].iov_base = "\r\n"; 15112909Swollman iov[msg.msg_iovlen++].iov_len = 2; 1521590Srgrimes 15366199Swollman /* 15466199Swollman * -T disables data-on-SYN: compatibility option to finger broken 15566199Swollman * hosts. Also, the implicit-open API is broken on IPv6, so do 15666199Swollman * the explicit connect there, too. 15766199Swollman */ 15866199Swollman if ((Tflag || ai->ai_addr->sa_family == AF_INET6) 15966199Swollman && connect(s, ai->ai_addr, ai->ai_addrlen) < 0) { 16066199Swollman warn("connect"); 16166199Swollman close(s); 16266199Swollman return -1; 16314631Solah } 16414631Solah 16527835Swollman if (sendmsg(s, &msg, 0) < 0) { 16666199Swollman warn("sendmsg"); 16712909Swollman close(s); 16866199Swollman return -1; 16912909Swollman } 17012909Swollman 1711590Srgrimes /* 1721590Srgrimes * Read from the remote system; once we're connected, we assume some 1731590Srgrimes * data. If none arrives, we hang until the user interrupts. 1741590Srgrimes * 1751590Srgrimes * If we see a <CR> or a <CR> with the high bit set, treat it as 1761590Srgrimes * a newline; if followed by a newline character, only output one 1771590Srgrimes * newline. 1781590Srgrimes * 1791590Srgrimes * Otherwise, all high bits are stripped; if it isn't printable and 1801590Srgrimes * it isn't a space, we can simply set the 7th bit. Every ASCII 1811590Srgrimes * character with bit 7 set is printable. 1828874Srgrimes */ 18323693Speter lastc = 0; 18423693Speter if ((fp = fdopen(s, "r")) != NULL) { 18546662Sobrien cnt = 0; 18646662Sobrien line_len = 0; 1871590Srgrimes while ((c = getc(fp)) != EOF) { 18846662Sobrien if (++cnt > OUTPUT_MAX) { 18946662Sobrien printf("\n\n Output truncated at %d bytes...\n", 19046662Sobrien cnt - 1); 19146662Sobrien break; 19246662Sobrien } 1931590Srgrimes if (c == 0x0d) { 1941590Srgrimes if (lastc == '\r') /* ^M^M - skip dupes */ 1951590Srgrimes continue; 1961590Srgrimes c = '\n'; 1971590Srgrimes lastc = '\r'; 1981590Srgrimes } else { 19914472Sache if (!isprint(c) && !isspace(c)) { 20014472Sache c &= 0x7f; 2011590Srgrimes c |= 0x40; 20214472Sache } 2031590Srgrimes if (lastc != '\r' || c != '\n') 2041590Srgrimes lastc = c; 2051590Srgrimes else { 2061590Srgrimes lastc = '\n'; 2071590Srgrimes continue; 2081590Srgrimes } 2091590Srgrimes } 2101590Srgrimes putchar(c); 21146662Sobrien if (c != '\n' && ++line_len > _POSIX2_LINE_MAX) { 21246662Sobrien putchar('\\'); 21346662Sobrien putchar('\n'); 21446662Sobrien lastc = '\r'; 21546662Sobrien } 21646662Sobrien if (lastc == '\n' || lastc == '\r') 21746662Sobrien line_len = 0; 2181590Srgrimes } 21912909Swollman if (ferror(fp)) { 22012909Swollman /* 22112909Swollman * Assume that whatever it was set errno... 22212909Swollman */ 22366199Swollman warn("reading from network"); 22412909Swollman } 22566199Swollman if (lastc != '\n') 22666199Swollman putchar('\n'); 22766199Swollman 22866199Swollman fclose(fp); 22912909Swollman } 23066199Swollman return 0; 2311590Srgrimes} 23266199Swollman 23366199Swollmanstatic void 23466199Swollmantrying(const struct addrinfo *ai) 23566199Swollman{ 23666199Swollman char buf[NI_MAXHOST]; 23766199Swollman 23866199Swollman if (getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof buf, 23966199Swollman (char *)0, 0, NI_NUMERICHOST) != 0) 24066199Swollman return; /* XXX can't happen */ 24166199Swollman 24266199Swollman printf("Trying %s...\n", buf); 24366199Swollman} 24466199Swollman 24566199Swollmanvoid 24666199Swollmancleanup(int sig) 24766199Swollman{ 24866199Swollman#define ERRSTR "Timed out.\n" 24966199Swollman write(STDERR_FILENO, ERRSTR, sizeof ERRSTR); 25066199Swollman exit(1); 25166199Swollman} 25266199Swollman 253