1 /* $NetBSD: fingerd.c,v 1.23 2006/05/09 20:18:06 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT( 35 "@(#) Copyright (c) 1983, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"); 37 #endif /* not lint */ 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "from: @(#)fingerd.c 8.1 (Berkeley) 6/4/93"; 42 #else 43 __RCSID("$NetBSD: fingerd.c,v 1.23 2006/05/09 20:18:06 mrg Exp $"); 44 #endif 45 #endif /* not lint */ 46 47 #include <sys/param.h> 48 #include <sys/socket.h> 49 #include <netinet/in.h> 50 #include <arpa/inet.h> 51 #include <errno.h> 52 53 #include <unistd.h> 54 #include <syslog.h> 55 #include <netdb.h> 56 #include <stdarg.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include "pathnames.h" 61 62 void err(const char *, ...); 63 int main(int, char *[]); 64 65 int 66 main(int argc, char *argv[]) 67 { 68 FILE *fp; 69 int ch, ac = 2; 70 char *lp = NULL /* XXX gcc */; 71 struct sockaddr_storage ss; 72 int p[2], logging, no_forward, user_required, short_list; 73 socklen_t sval; 74 #define ENTRIES 50 75 char **ap, *av[ENTRIES + 1], **comp, line[1024], *prog, *s; 76 char hostbuf[MAXHOSTNAMELEN]; 77 78 prog = _PATH_FINGER; 79 logging = no_forward = user_required = short_list = 0; 80 openlog("fingerd", LOG_PID, LOG_DAEMON); 81 opterr = 0; 82 while ((ch = getopt(argc, argv, "gsluShmpP:8")) != -1) 83 switch (ch) { 84 case 'l': 85 logging = 1; 86 break; 87 case 'P': 88 prog = optarg; 89 break; 90 case 's': 91 no_forward = 1; 92 break; 93 case 'u': 94 user_required = 1; 95 break; 96 case 'S': 97 short_list = 1; 98 av[ac++] = "-s"; 99 break; 100 case 'h': 101 av[ac++] = "-h"; 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 '8': 113 av[ac++] = "-8"; 114 break; 115 case '?': 116 default: 117 err("illegal option -- %c", optopt); 118 } 119 120 121 if (logging) { 122 sval = sizeof(ss); 123 if (getpeername(0, (struct sockaddr *)&ss, &sval) < 0) 124 err("getpeername: %s", strerror(errno)); 125 (void)getnameinfo((struct sockaddr *)&ss, sval, 126 hostbuf, sizeof(hostbuf), NULL, 0, 0); 127 lp = hostbuf; 128 } 129 130 if (!fgets(line, sizeof(line), stdin)) { 131 if (logging) 132 syslog(LOG_NOTICE, "query from %s", lp); 133 exit(1); 134 } 135 while ((s = strrchr(line, '\n')) != NULL || 136 (s = strrchr(line, '\r')) != NULL) 137 *s = '\0'; 138 139 if (logging) { 140 if (*line == '\0') 141 syslog(LOG_NOTICE, "query from %s", lp); 142 else 143 syslog(LOG_NOTICE, "query from %s: %s", lp, line); 144 } 145 146 av[ac++] = "--"; 147 comp = &av[1]; 148 for (lp = line, ap = &av[ac]; ac < ENTRIES;) { 149 if ((*ap = strtok(lp, " \t\r\n")) == NULL) 150 break; 151 lp = NULL; 152 if (no_forward && strchr(*ap, '@')) { 153 (void) puts("forwarding service denied\r\n"); 154 exit(1); 155 } 156 157 ch = strlen(*ap); 158 while ((*ap)[ch-1] == '@') 159 (*ap)[--ch] = '\0'; 160 if (**ap == '\0') 161 continue; 162 163 /* RFC1196: "/[Ww]" == "-l" */ 164 if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w')) { 165 if (!short_list) { 166 av[1] = "-l"; 167 comp = &av[0]; 168 } 169 } else { 170 ap++; 171 ac++; 172 } 173 } 174 av[ENTRIES - 1] = NULL; 175 176 if ((lp = strrchr(prog, '/'))) 177 *comp = ++lp; 178 else 179 *comp = prog; 180 181 if (user_required) { 182 for (ap = comp + 1; strcmp("--", *(ap++)); ); 183 if (*ap == NULL) { 184 (void) puts("must provide username\r\n"); 185 exit(1); 186 } 187 } 188 189 if (pipe(p) < 0) 190 err("pipe: %s", strerror(errno)); 191 192 switch(fork()) { 193 case 0: 194 (void) close(p[0]); 195 if (p[1] != 1) { 196 (void) dup2(p[1], 1); 197 (void) close(p[1]); 198 } 199 execv(prog, comp); 200 err("execv: %s: %s", prog, strerror(errno)); 201 _exit(1); 202 case -1: 203 err("fork: %s", strerror(errno)); 204 } 205 (void) close(p[1]); 206 if (!(fp = fdopen(p[0], "r"))) 207 err("fdopen: %s", strerror(errno)); 208 while ((ch = getc(fp)) != EOF) { 209 if (ch == '\n') 210 putchar('\r'); 211 putchar(ch); 212 } 213 exit(0); 214 } 215 216 void 217 err(const char *fmt, ...) 218 { 219 va_list ap; 220 221 va_start(ap, fmt); 222 (void) vsyslog(LOG_ERR, fmt, ap); 223 va_end(ap); 224 exit(1); 225 /* NOTREACHED */ 226 } 227