fingerd.c revision 71274
1/* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1983, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41#if 0 42static char sccsid[] = "@(#)fingerd.c 8.1 (Berkeley) 6/4/93"; 43#endif 44static const char rcsid[] = 45 "$FreeBSD: head/libexec/fingerd/fingerd.c 71274 2001-01-20 00:29:31Z jedgar $"; 46#endif /* not lint */ 47 48#include <sys/types.h> 49#include <sys/param.h> 50#include <sys/socket.h> 51#include <netinet/in.h> 52#include <netinet/tcp.h> 53#include <arpa/inet.h> 54#include <errno.h> 55 56#include <unistd.h> 57#include <syslog.h> 58#include <libutil.h> 59#include <netdb.h> 60#include <stdio.h> 61#include <stdlib.h> 62#include <strings.h> 63#include "pathnames.h" 64 65void logerr __P((const char *, ...)); 66 67int 68main(argc, argv) 69 int argc; 70 char *argv[]; 71{ 72 register FILE *fp; 73 register int ch; 74 register char *lp; 75 struct sockaddr_storage ss; 76 int p[2], logging, secure, sval; 77#define ENTRIES 50 78 char **ap, *av[ENTRIES + 1], **comp, line[1024], *prog; 79 char rhost[MAXHOSTNAMELEN]; 80 81 prog = _PATH_FINGER; 82 logging = secure = 0; 83 openlog("fingerd", LOG_PID | LOG_CONS, LOG_DAEMON); 84 opterr = 0; 85 while ((ch = getopt(argc, argv, "slp:")) != -1) 86 switch (ch) { 87 case 'l': 88 logging = 1; 89 break; 90 case 'p': 91 prog = optarg; 92 break; 93 case 's': 94 secure = 1; 95 break; 96 case '?': 97 default: 98 logerr("illegal option -- %c", optopt); 99 } 100 101 /* 102 * Enable server-side Transaction TCP. 103 */ 104 { 105#if !defined(__alpha__) /* XXX FIXME */ 106 int one = 1; 107 if (setsockopt(STDOUT_FILENO, IPPROTO_TCP, TCP_NOPUSH, &one, 108 sizeof one) < 0) { 109 logerr("setsockopt(TCP_NOPUSH) failed: %m"); 110 } 111#endif 112 } 113 114 if (!fgets(line, sizeof(line), stdin)) 115 exit(1); 116 117 if (logging) { 118 char *t; 119 char *end; 120 121 end = memchr(line, 0, sizeof(line)); 122 if (end == NULL) { 123 if ((t = malloc(sizeof(line) + 1)) == NULL) 124 logerr("malloc: %s", strerror(errno)); 125 memcpy(t, line, sizeof(line)); 126 t[sizeof(line)] = 0; 127 } else { 128 if ((t = strdup(line)) == NULL) 129 logerr("strdup: %s", strerror(errno)); 130 } 131 for (end = t; *end; end++) 132 if (*end == '\n' || *end == '\r') 133 *end = ' '; 134 sval = sizeof(ss); 135 if (getpeername(0, (struct sockaddr *)&ss, &sval) < 0) 136 logerr("getpeername: %s", strerror(errno)); 137 realhostname_sa(rhost, sizeof rhost - 1, 138 (struct sockaddr *)&ss, sval); 139 rhost[sizeof(rhost) - 1] = '\0'; 140 syslog(LOG_NOTICE, "query from %s: `%s'", rhost, t); 141 } 142 143 comp = &av[1]; 144 av[2] = "--"; 145 for (lp = line, ap = &av[3];;) { 146 *ap = strtok(lp, " \t\r\n"); 147 if (!*ap) { 148 if (secure && ap == &av[3]) { 149 puts("must provide username\r\n"); 150 exit(1); 151 } 152 break; 153 } 154 if (secure && strchr(*ap, '@')) { 155 puts("forwarding service denied\r\n"); 156 exit(1); 157 } 158 159 /* RFC742: "/[Ww]" == "-l" */ 160 if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w')) { 161 av[1] = "-l"; 162 comp = &av[0]; 163 } 164 else if (++ap == av + ENTRIES) 165 break; 166 lp = NULL; 167 } 168 169 if (lp = strrchr(prog, '/')) 170 *comp = ++lp; 171 else 172 *comp = prog; 173 if (pipe(p) < 0) 174 logerr("pipe: %s", strerror(errno)); 175 176 switch(vfork()) { 177 case 0: 178 (void)close(p[0]); 179 if (p[1] != 1) { 180 (void)dup2(p[1], 1); 181 (void)close(p[1]); 182 } 183 execv(prog, comp); 184 logerr("execv: %s: %s", prog, strerror(errno)); 185 _exit(1); 186 case -1: 187 logerr("fork: %s", strerror(errno)); 188 } 189 (void)close(p[1]); 190 if (!(fp = fdopen(p[0], "r"))) 191 logerr("fdopen: %s", strerror(errno)); 192 while ((ch = getc(fp)) != EOF) { 193 if (ch == '\n') 194 putchar('\r'); 195 putchar(ch); 196 } 197 exit(0); 198} 199 200#if __STDC__ 201#include <stdarg.h> 202#else 203#include <varargs.h> 204#endif 205 206void 207#if __STDC__ 208logerr(const char *fmt, ...) 209#else 210logerr(fmt, va_alist) 211 char *fmt; 212 va_dcl 213#endif 214{ 215 va_list ap; 216#if __STDC__ 217 va_start(ap, fmt); 218#else 219 va_start(ap); 220#endif 221 (void)vsyslog(LOG_ERR, fmt, ap); 222 va_end(ap); 223 exit(1); 224 /* NOTREACHED */ 225} 226