1 /* $NetBSD: fingerd.c,v 1.9 1998/08/29 22:54:58 kim Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 static char const copyright[] = 38 "@(#) Copyright (c) 1983, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "from: @(#)fingerd.c 8.1 (Berkeley) 6/4/93"; 45 #else 46 static char const rcsid[] = "$NetBSD: fingerd.c,v 1.9 1998/08/29 22:54:58 kim Exp $"; 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/types.h> 51 #include <sys/socket.h> 52 #include <netinet/in.h> 53 #include <arpa/inet.h> 54 #include <errno.h> 55 56 #include <unistd.h> 57 #include <syslog.h> 58 #include <netdb.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include "pathnames.h" 63 64 void err __P((const char *, ...)); 65 int main __P((int, char *[])); 66 67 int 68 main(argc, argv) 69 int argc; 70 char *argv[]; 71 { 72 register FILE *fp; 73 register int ch, ac = 2; 74 register char *lp = NULL /* XXX gcc */; 75 struct hostent *hp; 76 struct sockaddr_in sin; 77 int p[2], logging, no_forward, user_required, short_list, sval; 78 #define ENTRIES 50 79 char **ap, *av[ENTRIES + 1], **comp, line[1024], *prog, *s; 80 81 prog = _PATH_FINGER; 82 logging = no_forward = user_required = short_list = 0; 83 openlog("fingerd", LOG_PID | LOG_CONS, LOG_DAEMON); 84 opterr = 0; 85 while ((ch = getopt(argc, argv, "gsluShmpP:")) != -1) 86 switch (ch) { 87 case 'l': 88 logging = 1; 89 break; 90 case 'P': 91 prog = optarg; 92 break; 93 case 's': 94 no_forward = 1; 95 break; 96 case 'u': 97 user_required = 1; 98 break; 99 case 'S': 100 short_list = 1; 101 av[ac++] = "-s"; 102 break; 103 case 'h': 104 av[ac++] = "-h"; 105 break; 106 case 'm': 107 av[ac++] = "-m"; 108 break; 109 case 'p': 110 av[ac++] = "-p"; 111 break; 112 case 'g': 113 av[ac++] = "-g"; 114 break; 115 case '?': 116 default: 117 err("illegal option -- %c", ch); 118 } 119 120 121 if (logging) { 122 sval = sizeof(sin); 123 if (getpeername(0, (struct sockaddr *)&sin, &sval) < 0) 124 err("getpeername: %s", strerror(errno)); 125 if ((hp = gethostbyaddr((char *)&sin.sin_addr.s_addr, 126 sizeof(sin.sin_addr.s_addr), AF_INET))) 127 lp = hp->h_name; 128 else 129 lp = inet_ntoa(sin.sin_addr); 130 } 131 132 if (!fgets(line, sizeof(line), stdin)) { 133 if (logging) 134 syslog(LOG_NOTICE, "query from %s", lp); 135 exit(1); 136 } 137 while ((s = strrchr(line, '\n')) != NULL || 138 (s = strrchr(line, '\r')) != NULL) 139 *s = '\0'; 140 141 if (logging) { 142 if (*line == '\0') 143 syslog(LOG_NOTICE, "query from %s", lp); 144 else 145 syslog(LOG_NOTICE, "query from %s: %s", lp, line); 146 } 147 148 av[ac++] = "--"; 149 comp = &av[1]; 150 for (lp = line, ap = &av[ac]; ac < ENTRIES;) { 151 if ((*ap = strtok(lp, " \t\r\n")) == NULL) 152 break; 153 lp = NULL; 154 if (no_forward && strchr(*ap, '@')) { 155 (void) puts("fowarding service denied\r\n"); 156 exit(1); 157 } 158 159 ch = strlen(*ap); 160 while ((*ap)[ch-1] == '@') 161 (*ap)[--ch] = '\0'; 162 if (**ap == '\0') 163 continue; 164 165 /* RFC1196: "/[Ww]" == "-l" */ 166 if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w')) { 167 if (!short_list) { 168 av[1] = "-l"; 169 comp = &av[0]; 170 } 171 } else { 172 ap++; 173 ac++; 174 } 175 } 176 av[ENTRIES - 1] = NULL; 177 178 if ((lp = strrchr(prog, '/'))) 179 *comp = ++lp; 180 else 181 *comp = prog; 182 183 if (user_required) { 184 for (ap = comp + 1; strcmp("--", *(ap++)); ); 185 if (*ap == NULL) { 186 (void) puts("must provide username\r\n"); 187 exit(1); 188 } 189 } 190 191 if (pipe(p) < 0) 192 err("pipe: %s", strerror(errno)); 193 194 switch(fork()) { 195 case 0: 196 (void) close(p[0]); 197 if (p[1] != 1) { 198 (void) dup2(p[1], 1); 199 (void) close(p[1]); 200 } 201 execv(prog, comp); 202 err("execv: %s: %s", prog, strerror(errno)); 203 _exit(1); 204 case -1: 205 err("fork: %s", strerror(errno)); 206 } 207 (void) close(p[1]); 208 if (!(fp = fdopen(p[0], "r"))) 209 err("fdopen: %s", strerror(errno)); 210 while ((ch = getc(fp)) != EOF) { 211 if (ch == '\n') 212 putchar('\r'); 213 putchar(ch); 214 } 215 exit(0); 216 } 217 218 #if __STDC__ 219 #include <stdarg.h> 220 #else 221 #include <varargs.h> 222 #endif 223 224 void 225 #if __STDC__ 226 err(const char *fmt, ...) 227 #else 228 err(fmt, va_alist) 229 char *fmt; 230 va_dcl 231 #endif 232 { 233 va_list ap; 234 #if __STDC__ 235 va_start(ap, fmt); 236 #else 237 va_start(ap); 238 #endif 239 (void) vsyslog(LOG_ERR, fmt, ap); 240 va_end(ap); 241 exit(1); 242 /* NOTREACHED */ 243 } 244