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 35 static 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 static char sccsid[] = "@(#)fingerd.c 8.1 (Berkeley) 6/4/93"; 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <sys/socket.h> 46 #include <netinet/in.h> 47 #include <arpa/inet.h> 48 #include <errno.h> 49 50 #include <unistd.h> 51 #include <syslog.h> 52 #include <netdb.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <strings.h> 56 #include "pathnames.h" 57 58 void err __P((const char *, ...)); 59 60 int 61 main(argc, argv) 62 int argc; 63 char *argv[]; 64 { 65 register FILE *fp; 66 register int ch; 67 register char *lp; 68 struct hostent *hp; 69 struct sockaddr_in sin; 70 int p[2], logging, secure, sval; 71 #define ENTRIES 50 72 char **ap, *av[ENTRIES + 1], **comp, line[1024], *prog; 73 74 prog = _PATH_FINGER; 75 logging = secure = 0; 76 openlog("fingerd", LOG_PID | LOG_CONS, LOG_DAEMON); 77 opterr = 0; 78 while ((ch = getopt(argc, argv, "slp:")) != EOF) 79 switch (ch) { 80 case 'l': 81 logging = 1; 82 break; 83 case 'p': 84 prog = optarg; 85 break; 86 case 's': 87 secure = 1; 88 break; 89 case '?': 90 default: 91 err("illegal option -- %c", ch); 92 } 93 94 if (logging) { 95 sval = sizeof(sin); 96 if (getpeername(0, (struct sockaddr *)&sin, &sval) < 0) 97 err("getpeername: %s", strerror(errno)); 98 if (hp = gethostbyaddr((char *)&sin.sin_addr.s_addr, 99 sizeof(sin.sin_addr.s_addr), AF_INET)) 100 lp = hp->h_name; 101 else 102 lp = inet_ntoa(sin.sin_addr); 103 syslog(LOG_NOTICE, "query from %s", lp); 104 } 105 106 if (!fgets(line, sizeof(line), stdin)) 107 exit(1); 108 109 comp = &av[1]; 110 for (lp = line, ap = &av[2];;) { 111 *ap = strtok(lp, " \t\r\n"); 112 if (!*ap) { 113 if (secure && ap == &av[2]) { 114 puts("must provide username\r\n"); 115 exit(1); 116 } 117 break; 118 } 119 if (secure && strchr(*ap, '@')) { 120 puts("forwarding service denied\r\n"); 121 exit(1); 122 } 123 124 /* RFC742: "/[Ww]" == "-l" */ 125 if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w')) { 126 av[1] = "-l"; 127 comp = &av[0]; 128 } 129 else if (++ap == av + ENTRIES) 130 break; 131 lp = NULL; 132 } 133 134 if (lp = strrchr(prog, '/')) 135 *comp = ++lp; 136 else 137 *comp = prog; 138 if (pipe(p) < 0) 139 err("pipe: %s", strerror(errno)); 140 141 switch(vfork()) { 142 case 0: 143 (void)close(p[0]); 144 if (p[1] != 1) { 145 (void)dup2(p[1], 1); 146 (void)close(p[1]); 147 } 148 execv(prog, comp); 149 err("execv: %s: %s", prog, strerror(errno)); 150 _exit(1); 151 case -1: 152 err("fork: %s", strerror(errno)); 153 } 154 (void)close(p[1]); 155 if (!(fp = fdopen(p[0], "r"))) 156 err("fdopen: %s", strerror(errno)); 157 while ((ch = getc(fp)) != EOF) { 158 if (ch == '\n') 159 putchar('\r'); 160 putchar(ch); 161 } 162 exit(0); 163 } 164 165 #if __STDC__ 166 #include <stdarg.h> 167 #else 168 #include <varargs.h> 169 #endif 170 171 void 172 #if __STDC__ 173 err(const char *fmt, ...) 174 #else 175 err(fmt, va_alist) 176 char *fmt; 177 va_dcl 178 #endif 179 { 180 va_list ap; 181 #if __STDC__ 182 va_start(ap, fmt); 183 #else 184 va_start(ap); 185 #endif 186 (void)vsyslog(LOG_ERR, fmt, ap); 187 va_end(ap); 188 exit(1); 189 /* NOTREACHED */ 190 } 191