fingerd.c revision 98897
11592Srgrimes/* 21592Srgrimes * Copyright (c) 1983, 1993 31592Srgrimes * The Regents of the University of California. All rights reserved. 41592Srgrimes * 51592Srgrimes * Redistribution and use in source and binary forms, with or without 61592Srgrimes * modification, are permitted provided that the following conditions 71592Srgrimes * are met: 81592Srgrimes * 1. Redistributions of source code must retain the above copyright 91592Srgrimes * notice, this list of conditions and the following disclaimer. 101592Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111592Srgrimes * notice, this list of conditions and the following disclaimer in the 121592Srgrimes * documentation and/or other materials provided with the distribution. 131592Srgrimes * 3. All advertising materials mentioning features or use of this software 141592Srgrimes * must display the following acknowledgement: 151592Srgrimes * This product includes software developed by the University of 161592Srgrimes * California, Berkeley and its contributors. 171592Srgrimes * 4. Neither the name of the University nor the names of its contributors 181592Srgrimes * may be used to endorse or promote products derived from this software 191592Srgrimes * without specific prior written permission. 201592Srgrimes * 211592Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221592Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231592Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241592Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251592Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261592Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271592Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281592Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291592Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301592Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311592Srgrimes * SUCH DAMAGE. 321592Srgrimes */ 331592Srgrimes 341592Srgrimes#ifndef lint 3531308Scharnierstatic const char copyright[] = 361592Srgrimes"@(#) Copyright (c) 1983, 1993\n\ 371592Srgrimes The Regents of the University of California. All rights reserved.\n"; 381592Srgrimes#endif /* not lint */ 391592Srgrimes 401592Srgrimes#ifndef lint 4131308Scharnier#if 0 421592Srgrimesstatic char sccsid[] = "@(#)fingerd.c 8.1 (Berkeley) 6/4/93"; 4331308Scharnier#endif 4412908Swollmanstatic const char rcsid[] = 4550476Speter "$FreeBSD: head/libexec/fingerd/fingerd.c 98897 2002-06-26 21:46:56Z wollman $"; 461592Srgrimes#endif /* not lint */ 471592Srgrimes 4871274Sjedgar#include <sys/types.h> 4945393Sbrian#include <sys/param.h> 501592Srgrimes#include <sys/socket.h> 511592Srgrimes#include <netinet/in.h> 5212908Swollman#include <netinet/tcp.h> 531592Srgrimes#include <arpa/inet.h> 541592Srgrimes#include <errno.h> 551592Srgrimes 561592Srgrimes#include <unistd.h> 571592Srgrimes#include <syslog.h> 5871274Sjedgar#include <libutil.h> 591592Srgrimes#include <netdb.h> 601592Srgrimes#include <stdio.h> 611592Srgrimes#include <stdlib.h> 6297635Swollman#include <string.h> 631592Srgrimes#include "pathnames.h" 641592Srgrimes 6590148Simpvoid logerr(const char *, ...); 661592Srgrimes 671592Srgrimesint 6890148Simpmain(int argc, char *argv[]) 691592Srgrimes{ 7090148Simp FILE *fp; 7190148Simp int ch; 7290148Simp char *lp; 7357313Sshin struct sockaddr_storage ss; 7498897Swollman int p[2], logging, pflag, secure, sval; 751592Srgrimes#define ENTRIES 50 761592Srgrimes char **ap, *av[ENTRIES + 1], **comp, line[1024], *prog; 7745418Sbrian char rhost[MAXHOSTNAMELEN]; 781592Srgrimes 791592Srgrimes prog = _PATH_FINGER; 8098897Swollman logging = pflag = secure = 0; 811592Srgrimes openlog("fingerd", LOG_PID | LOG_CONS, LOG_DAEMON); 821592Srgrimes opterr = 0; 8398897Swollman while ((ch = getopt(argc, argv, "lp:s")) != -1) 841592Srgrimes switch (ch) { 851592Srgrimes case 'l': 861592Srgrimes logging = 1; 871592Srgrimes break; 881592Srgrimes case 'p': 891592Srgrimes prog = optarg; 9098897Swollman pflag = 1; 911592Srgrimes break; 921592Srgrimes case 's': 931592Srgrimes secure = 1; 941592Srgrimes break; 951592Srgrimes case '?': 961592Srgrimes default: 9747291Speter logerr("illegal option -- %c", optopt); 981592Srgrimes } 991592Srgrimes 10012908Swollman /* 10112908Swollman * Enable server-side Transaction TCP. 10212908Swollman */ 10312908Swollman { 10412908Swollman int one = 1; 10512908Swollman if (setsockopt(STDOUT_FILENO, IPPROTO_TCP, TCP_NOPUSH, &one, 10612908Swollman sizeof one) < 0) { 10712908Swollman logerr("setsockopt(TCP_NOPUSH) failed: %m"); 10812908Swollman } 10912908Swollman } 11012908Swollman 1111592Srgrimes if (!fgets(line, sizeof(line), stdin)) 1121592Srgrimes exit(1); 1138870Srgrimes 11498897Swollman if (logging || pflag) { 11598897Swollman sval = sizeof(ss); 11698897Swollman if (getpeername(0, (struct sockaddr *)&ss, &sval) < 0) 11798897Swollman logerr("getpeername: %s", strerror(errno)); 11898897Swollman realhostname_sa(rhost, sizeof rhost - 1, 11998897Swollman (struct sockaddr *)&ss, sval); 12098897Swollman rhost[sizeof(rhost) - 1] = '\0'; 12198897Swollman if (pflag) 12298897Swollman setenv("FINGERD_REMOTE_HOST", rhost, 1); 12398897Swollman } 12498897Swollman 12531168Ssef if (logging) { 12631168Ssef char *t; 12731168Ssef char *end; 12831168Ssef 12931168Ssef end = memchr(line, 0, sizeof(line)); 13031168Ssef if (end == NULL) { 13171274Sjedgar if ((t = malloc(sizeof(line) + 1)) == NULL) 13271274Sjedgar logerr("malloc: %s", strerror(errno)); 13331168Ssef memcpy(t, line, sizeof(line)); 13431168Ssef t[sizeof(line)] = 0; 13531168Ssef } else { 13671274Sjedgar if ((t = strdup(line)) == NULL) 13771274Sjedgar logerr("strdup: %s", strerror(errno)); 13831168Ssef } 13931168Ssef for (end = t; *end; end++) 14031168Ssef if (*end == '\n' || *end == '\r') 14131168Ssef *end = ' '; 14245393Sbrian syslog(LOG_NOTICE, "query from %s: `%s'", rhost, t); 14331168Ssef } 14431168Ssef 1451592Srgrimes comp = &av[1]; 14612728Speter av[2] = "--"; 14712728Speter for (lp = line, ap = &av[3];;) { 1481592Srgrimes *ap = strtok(lp, " \t\r\n"); 1491592Srgrimes if (!*ap) { 15012728Speter if (secure && ap == &av[3]) { 1511592Srgrimes puts("must provide username\r\n"); 1521592Srgrimes exit(1); 1531592Srgrimes } 1541592Srgrimes break; 1551592Srgrimes } 1561592Srgrimes if (secure && strchr(*ap, '@')) { 1576180Sphk puts("forwarding service denied\r\n"); 1581592Srgrimes exit(1); 1591592Srgrimes } 1601592Srgrimes 1611592Srgrimes /* RFC742: "/[Ww]" == "-l" */ 1621592Srgrimes if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w')) { 1631592Srgrimes av[1] = "-l"; 1641592Srgrimes comp = &av[0]; 1651592Srgrimes } 16684454Sru else if (++ap == av + ENTRIES) { 16784454Sru *ap = NULL; 1681592Srgrimes break; 16984454Sru } 1701592Srgrimes lp = NULL; 1711592Srgrimes } 1721592Srgrimes 1731592Srgrimes if (lp = strrchr(prog, '/')) 1741592Srgrimes *comp = ++lp; 1751592Srgrimes else 1761592Srgrimes *comp = prog; 1771592Srgrimes if (pipe(p) < 0) 17812908Swollman logerr("pipe: %s", strerror(errno)); 1791592Srgrimes 1801592Srgrimes switch(vfork()) { 1811592Srgrimes case 0: 1821592Srgrimes (void)close(p[0]); 18398897Swollman if (p[1] != STDOUT_FILENO) { 18498897Swollman (void)dup2(p[1], STDOUT_FILENO); 1851592Srgrimes (void)close(p[1]); 1861592Srgrimes } 18798897Swollman dup2(STDOUT_FILENO, STDERR_FILENO); 18898897Swollman 1891592Srgrimes execv(prog, comp); 19098897Swollman write(STDERR_FILENO, prog, strlen(prog)); 19198897Swollman#define MSG ": cannot execute\n" 19298897Swollman write(STDERR_FILENO, MSG, strlen(MSG)); 19398897Swollman#undef MSG 1941592Srgrimes _exit(1); 1951592Srgrimes case -1: 19612908Swollman logerr("fork: %s", strerror(errno)); 1971592Srgrimes } 1981592Srgrimes (void)close(p[1]); 1991592Srgrimes if (!(fp = fdopen(p[0], "r"))) 20012908Swollman logerr("fdopen: %s", strerror(errno)); 2011592Srgrimes while ((ch = getc(fp)) != EOF) { 2021592Srgrimes if (ch == '\n') 2031592Srgrimes putchar('\r'); 2041592Srgrimes putchar(ch); 2051592Srgrimes } 2061592Srgrimes exit(0); 2071592Srgrimes} 2081592Srgrimes 2091592Srgrimes#include <stdarg.h> 2101592Srgrimes 2111592Srgrimesvoid 21212908Swollmanlogerr(const char *fmt, ...) 2131592Srgrimes{ 2141592Srgrimes va_list ap; 2151592Srgrimes va_start(ap, fmt); 2161592Srgrimes (void)vsyslog(LOG_ERR, fmt, ap); 2171592Srgrimes va_end(ap); 2181592Srgrimes exit(1); 2191592Srgrimes /* NOTREACHED */ 2201592Srgrimes} 221