net.c revision 72109
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"; 4072109Scharnier#endif 4127169Scharnierstatic const char rcsid[] = 4250477Speter "$FreeBSD: head/usr.bin/finger/net.c 72109 2001-02-06 20:13:48Z charnier $"; 431590Srgrimes#endif /* not lint */ 441590Srgrimes 4536792Simp#include <sys/param.h> 461590Srgrimes#include <sys/socket.h> 4772109Scharnier#include <sys/uio.h> 4872109Scharnier#include <ctype.h> 491590Srgrimes#include <db.h> 5027169Scharnier#include <err.h> 5172109Scharnier#include <netdb.h> 521590Srgrimes#include <pwd.h> 531590Srgrimes#include <stdio.h> 541590Srgrimes#include <string.h> 5572109Scharnier#include <unistd.h> 5672109Scharnier#include <utmp.h> 571590Srgrimes#include "finger.h" 581590Srgrimes 5966199Swollmanextern int lflag; /* XXX finger.h? */ 6066199Swollmanextern int Tflag; /* XXX finger.h? */ 6146662Sobrien 6266199Swollmanstatic void cleanup(int sig);; 6366199Swollmanstatic int do_protocol(const char *name, const struct addrinfo *ai); 6466199Swollmanstatic void trying(const struct addrinfo *ai); 6566199Swollman 6646662Sobrienvoid 671590Srgrimesnetfinger(name) 681590Srgrimes char *name; 691590Srgrimes{ 7066199Swollman int error, multi; 7166199Swollman char *host; 7266199Swollman struct addrinfo *ai, *ai0; 7366199Swollman static struct addrinfo hint; 741590Srgrimes 7566199Swollman host = strrchr(name, '@'); 7666199Swollman if (host == 0) 771590Srgrimes return; 7827169Scharnier *host++ = '\0'; 7946662Sobrien signal(SIGALRM, cleanup); 8066199Swollman alarm(TIME_LIMIT); 8166199Swollman 8266199Swollman hint.ai_flags = AI_CANONNAME; 8366199Swollman hint.ai_family = PF_UNSPEC; 8466199Swollman hint.ai_socktype = SOCK_STREAM; 8566199Swollman 8666199Swollman error = getaddrinfo(host, "finger", &hint, &ai0); 8766199Swollman if (error) { 8866199Swollman warnx("%s: %s", host, gai_strerror(error)); 891590Srgrimes return; 901590Srgrimes } 9166199Swollman 9266199Swollman multi = (ai0->ai_next) != 0; 9366199Swollman 9466315Swollman /* ai_canonname may not be filled in if the user specified an IP. */ 9566315Swollman if (ai0->ai_canonname == 0) 9666315Swollman printf("[%s]\n", host); 9766315Swollman else 9866315Swollman printf("[%s]\n", ai0->ai_canonname); 9966315Swollman 10066199Swollman for (ai = ai0; ai != 0; ai = ai->ai_next) { 10166199Swollman if (multi) 10266199Swollman trying(ai); 10366199Swollman 10466199Swollman error = do_protocol(name, ai); 10566199Swollman if (!error) 10666199Swollman break; 1071590Srgrimes } 10866199Swollman alarm(0); 10966199Swollman freeaddrinfo(ai0); 11066199Swollman} 11166199Swollman 11266199Swollmanstatic int 11366199Swollmando_protocol(const char *name, const struct addrinfo *ai) 11466199Swollman{ 11567467Sru int cnt, line_len, s; 11666199Swollman register FILE *fp; 11766199Swollman register int c, lastc; 11866199Swollman struct iovec iov[3]; 11966199Swollman struct msghdr msg; 12066199Swollman 12166199Swollman s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 12266199Swollman if (s < 0) { 12366199Swollman warn("socket(%d, %d, %d)", ai->ai_family, ai->ai_socktype, 12466199Swollman ai->ai_protocol); 12566199Swollman return -1; 1261590Srgrimes } 1271590Srgrimes 12866199Swollman msg.msg_name = (void *)ai->ai_addr; 12966199Swollman msg.msg_namelen = ai->ai_addrlen; 13012909Swollman msg.msg_iov = iov; 13112909Swollman msg.msg_iovlen = 0; 13212909Swollman msg.msg_control = 0; 13312909Swollman msg.msg_controllen = 0; 13427835Swollman msg.msg_flags = 0; 13512909Swollman 1361590Srgrimes /* -l flag for remote fingerd */ 13712909Swollman if (lflag) { 13812909Swollman iov[msg.msg_iovlen].iov_base = "/W "; 13912909Swollman iov[msg.msg_iovlen++].iov_len = 3; 14012909Swollman } 1411590Srgrimes /* send the name followed by <CR><LF> */ 14267467Sru iov[msg.msg_iovlen].iov_base = (char *)name; 14312909Swollman iov[msg.msg_iovlen++].iov_len = strlen(name); 14412909Swollman iov[msg.msg_iovlen].iov_base = "\r\n"; 14512909Swollman iov[msg.msg_iovlen++].iov_len = 2; 1461590Srgrimes 14766199Swollman /* 14866199Swollman * -T disables data-on-SYN: compatibility option to finger broken 14966199Swollman * hosts. Also, the implicit-open API is broken on IPv6, so do 15066199Swollman * the explicit connect there, too. 15166199Swollman */ 15266199Swollman if ((Tflag || ai->ai_addr->sa_family == AF_INET6) 15366199Swollman && connect(s, ai->ai_addr, ai->ai_addrlen) < 0) { 15466199Swollman warn("connect"); 15566199Swollman close(s); 15666199Swollman return -1; 15714631Solah } 15814631Solah 15927835Swollman if (sendmsg(s, &msg, 0) < 0) { 16066199Swollman warn("sendmsg"); 16112909Swollman close(s); 16266199Swollman return -1; 16312909Swollman } 16412909Swollman 1651590Srgrimes /* 1661590Srgrimes * Read from the remote system; once we're connected, we assume some 1671590Srgrimes * data. If none arrives, we hang until the user interrupts. 1681590Srgrimes * 1691590Srgrimes * If we see a <CR> or a <CR> with the high bit set, treat it as 1701590Srgrimes * a newline; if followed by a newline character, only output one 1711590Srgrimes * newline. 1721590Srgrimes * 1731590Srgrimes * Otherwise, all high bits are stripped; if it isn't printable and 1741590Srgrimes * it isn't a space, we can simply set the 7th bit. Every ASCII 1751590Srgrimes * character with bit 7 set is printable. 1768874Srgrimes */ 17723693Speter lastc = 0; 17823693Speter if ((fp = fdopen(s, "r")) != NULL) { 17946662Sobrien cnt = 0; 18046662Sobrien line_len = 0; 1811590Srgrimes while ((c = getc(fp)) != EOF) { 18246662Sobrien if (++cnt > OUTPUT_MAX) { 18346662Sobrien printf("\n\n Output truncated at %d bytes...\n", 18446662Sobrien cnt - 1); 18546662Sobrien break; 18646662Sobrien } 1871590Srgrimes if (c == 0x0d) { 1881590Srgrimes if (lastc == '\r') /* ^M^M - skip dupes */ 1891590Srgrimes continue; 1901590Srgrimes c = '\n'; 1911590Srgrimes lastc = '\r'; 1921590Srgrimes } else { 19314472Sache if (!isprint(c) && !isspace(c)) { 19414472Sache c &= 0x7f; 1951590Srgrimes c |= 0x40; 19614472Sache } 1971590Srgrimes if (lastc != '\r' || c != '\n') 1981590Srgrimes lastc = c; 1991590Srgrimes else { 2001590Srgrimes lastc = '\n'; 2011590Srgrimes continue; 2021590Srgrimes } 2031590Srgrimes } 2041590Srgrimes putchar(c); 20546662Sobrien if (c != '\n' && ++line_len > _POSIX2_LINE_MAX) { 20646662Sobrien putchar('\\'); 20746662Sobrien putchar('\n'); 20846662Sobrien lastc = '\r'; 20946662Sobrien } 21046662Sobrien if (lastc == '\n' || lastc == '\r') 21146662Sobrien line_len = 0; 2121590Srgrimes } 21312909Swollman if (ferror(fp)) { 21412909Swollman /* 21512909Swollman * Assume that whatever it was set errno... 21612909Swollman */ 21766199Swollman warn("reading from network"); 21812909Swollman } 21966199Swollman if (lastc != '\n') 22066199Swollman putchar('\n'); 22166199Swollman 22266199Swollman fclose(fp); 22312909Swollman } 22466199Swollman return 0; 2251590Srgrimes} 22666199Swollman 22766199Swollmanstatic void 22866199Swollmantrying(const struct addrinfo *ai) 22966199Swollman{ 23066199Swollman char buf[NI_MAXHOST]; 23166199Swollman 23266199Swollman if (getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof buf, 23366199Swollman (char *)0, 0, NI_NUMERICHOST) != 0) 23466199Swollman return; /* XXX can't happen */ 23566199Swollman 23666199Swollman printf("Trying %s...\n", buf); 23766199Swollman} 23866199Swollman 23966199Swollmanvoid 24066199Swollmancleanup(int sig) 24166199Swollman{ 24266199Swollman#define ERRSTR "Timed out.\n" 24366199Swollman write(STDERR_FILENO, ERRSTR, sizeof ERRSTR); 24466199Swollman exit(1); 24566199Swollman} 24666199Swollman 247