1 /* $NetBSD: fingerd.c,v 1.6 1997/09/09 05:38:26 mrg 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 1.6 1997/09/09 05:38:26 mrg 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 <strings.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, "gsluSmpP:")) != EOF) 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 'm': 104 av[ac++] = "-m"; 105 break; 106 case 'p': 107 av[ac++] = "-p"; 108 break; 109 case 'g': 110 av[ac++] = "-g"; 111 break; 112 case '?': 113 default: 114 err("illegal option -- %c", ch); 115 } 116 117 118 if (logging) { 119 sval = sizeof(sin); 120 if (getpeername(0, (struct sockaddr *)&sin, &sval) < 0) 121 err("getpeername: %s", strerror(errno)); 122 if ((hp = gethostbyaddr((char *)&sin.sin_addr.s_addr, 123 sizeof(sin.sin_addr.s_addr), AF_INET))) 124 lp = hp->h_name; 125 else 126 lp = inet_ntoa(sin.sin_addr); 127 } 128 129 if (!fgets(line, sizeof(line), stdin)) { 130 if (logging) 131 syslog(LOG_NOTICE, "query from %s", lp); 132 exit(1); 133 } 134 while ((s = strrchr(line, '\n')) != NULL || 135 (s = strrchr(line, '\r')) != NULL) 136 *s = '\0'; 137 138 if (logging) { 139 if (*line == '\0') 140 syslog(LOG_NOTICE, "query from %s", lp); 141 else 142 syslog(LOG_NOTICE, "query from %s: %s", lp, line); 143 } 144 145 av[ac++] = "--"; 146 comp = &av[1]; 147 for (lp = line, ap = &av[ac]; ac < ENTRIES;) { 148 if ((*ap = strtok(lp, " \t\r\n")) == NULL) 149 break; 150 lp = NULL; 151 if (no_forward && strchr(*ap, '@')) { 152 (void) puts("fowarding service denied\r\n"); 153 exit(1); 154 } 155 156 ch = strlen(*ap); 157 while ((*ap)[ch-1] == '@') 158 (*ap)[--ch] = '\0'; 159 if (**ap == '\0') 160 continue; 161 162 /* RFC1196: "/[Ww]" == "-l" */ 163 if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w')) { 164 if (!short_list) { 165 av[1] = "-l"; 166 comp = &av[0]; 167 } 168 } else { 169 ap++; 170 ac++; 171 } 172 } 173 av[ENTRIES - 1] = NULL; 174 175 if ((lp = strrchr(prog, '/'))) 176 *comp = ++lp; 177 else 178 *comp = prog; 179 180 if (user_required) { 181 for (ap = comp + 1; strcmp("--", *(ap++)); ); 182 if (*ap == NULL) { 183 (void) puts("must provide username\r\n"); 184 exit(1); 185 } 186 } 187 188 if (pipe(p) < 0) 189 err("pipe: %s", strerror(errno)); 190 191 switch(fork()) { 192 case 0: 193 (void) close(p[0]); 194 if (p[1] != 1) { 195 (void) dup2(p[1], 1); 196 (void) close(p[1]); 197 } 198 execv(prog, comp); 199 err("execv: %s: %s", prog, strerror(errno)); 200 _exit(1); 201 case -1: 202 err("fork: %s", strerror(errno)); 203 } 204 (void) close(p[1]); 205 if (!(fp = fdopen(p[0], "r"))) 206 err("fdopen: %s", strerror(errno)); 207 while ((ch = getc(fp)) != EOF) { 208 if (ch == '\n') 209 putchar('\r'); 210 putchar(ch); 211 } 212 exit(0); 213 } 214 215 #if __STDC__ 216 #include <stdarg.h> 217 #else 218 #include <varargs.h> 219 #endif 220 221 void 222 #if __STDC__ 223 err(const char *fmt, ...) 224 #else 225 err(fmt, va_alist) 226 char *fmt; 227 va_dcl 228 #endif 229 { 230 va_list ap; 231 #if __STDC__ 232 va_start(ap, fmt); 233 #else 234 va_start(ap); 235 #endif 236 (void) vsyslog(LOG_ERR, fmt, ap); 237 va_end(ap); 238 exit(1); 239 /* NOTREACHED */ 240 } 241