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 * @(#) Copyright (c) 1983, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)fingerd.c 8.1 (Berkeley) 6/4/93 35 * $FreeBSD: src/libexec/fingerd/fingerd.c,v 1.16.2.3 2002/04/03 09:05:23 mike Exp $ 36 * $DragonFly: src/libexec/fingerd/fingerd.c,v 1.3 2003/11/14 03:54:29 dillon Exp $ 37 */ 38 39 #include <sys/types.h> 40 #include <sys/param.h> 41 #include <sys/socket.h> 42 #include <netinet/in.h> 43 #include <netinet/tcp.h> 44 #include <arpa/inet.h> 45 #include <errno.h> 46 47 #include <unistd.h> 48 #include <syslog.h> 49 #include <libutil.h> 50 #include <netdb.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <strings.h> 54 #include "pathnames.h" 55 56 void logerr (const char *, ...); 57 58 int 59 main(argc, argv) 60 int argc; 61 char *argv[]; 62 { 63 register FILE *fp; 64 register int ch; 65 register char *lp; 66 struct sockaddr_storage ss; 67 int p[2], logging, secure, sval; 68 #define ENTRIES 50 69 char **ap, *av[ENTRIES + 1], **comp, line[1024], *prog; 70 char rhost[MAXHOSTNAMELEN]; 71 72 prog = _PATH_FINGER; 73 logging = secure = 0; 74 openlog("fingerd", LOG_PID | LOG_CONS, LOG_DAEMON); 75 opterr = 0; 76 while ((ch = getopt(argc, argv, "slp:")) != -1) 77 switch (ch) { 78 case 'l': 79 logging = 1; 80 break; 81 case 'p': 82 prog = optarg; 83 break; 84 case 's': 85 secure = 1; 86 break; 87 case '?': 88 default: 89 logerr("illegal option -- %c", optopt); 90 } 91 92 /* 93 * Enable server-side Transaction TCP. 94 */ 95 { 96 int one = 1; 97 if (setsockopt(STDOUT_FILENO, IPPROTO_TCP, TCP_NOPUSH, &one, 98 sizeof one) < 0) { 99 logerr("setsockopt(TCP_NOPUSH) failed: %m"); 100 } 101 } 102 103 if (!fgets(line, sizeof(line), stdin)) 104 exit(1); 105 106 if (logging) { 107 char *t; 108 char *end; 109 110 end = memchr(line, 0, sizeof(line)); 111 if (end == NULL) { 112 if ((t = malloc(sizeof(line) + 1)) == NULL) 113 logerr("malloc: %s", strerror(errno)); 114 memcpy(t, line, sizeof(line)); 115 t[sizeof(line)] = 0; 116 } else { 117 if ((t = strdup(line)) == NULL) 118 logerr("strdup: %s", strerror(errno)); 119 } 120 for (end = t; *end; end++) 121 if (*end == '\n' || *end == '\r') 122 *end = ' '; 123 sval = sizeof(ss); 124 if (getpeername(0, (struct sockaddr *)&ss, &sval) < 0) 125 logerr("getpeername: %s", strerror(errno)); 126 realhostname_sa(rhost, sizeof rhost - 1, 127 (struct sockaddr *)&ss, sval); 128 rhost[sizeof(rhost) - 1] = '\0'; 129 syslog(LOG_NOTICE, "query from %s: `%s'", rhost, t); 130 } 131 132 comp = &av[1]; 133 av[2] = "--"; 134 for (lp = line, ap = &av[3];;) { 135 *ap = strtok(lp, " \t\r\n"); 136 if (!*ap) { 137 if (secure && ap == &av[3]) { 138 puts("must provide username\r\n"); 139 exit(1); 140 } 141 break; 142 } 143 if (secure && strchr(*ap, '@')) { 144 puts("forwarding service denied\r\n"); 145 exit(1); 146 } 147 148 /* RFC742: "/[Ww]" == "-l" */ 149 if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w')) { 150 av[1] = "-l"; 151 comp = &av[0]; 152 } 153 else if (++ap == av + ENTRIES) { 154 *ap = NULL; 155 break; 156 } 157 lp = NULL; 158 } 159 160 if (lp = strrchr(prog, '/')) 161 *comp = ++lp; 162 else 163 *comp = prog; 164 if (pipe(p) < 0) 165 logerr("pipe: %s", strerror(errno)); 166 167 switch(vfork()) { 168 case 0: 169 (void)close(p[0]); 170 if (p[1] != 1) { 171 (void)dup2(p[1], 1); 172 (void)close(p[1]); 173 } 174 execv(prog, comp); 175 logerr("execv: %s: %s", prog, strerror(errno)); 176 _exit(1); 177 case -1: 178 logerr("fork: %s", strerror(errno)); 179 } 180 (void)close(p[1]); 181 if (!(fp = fdopen(p[0], "r"))) 182 logerr("fdopen: %s", strerror(errno)); 183 while ((ch = getc(fp)) != EOF) { 184 if (ch == '\n') 185 putchar('\r'); 186 putchar(ch); 187 } 188 exit(0); 189 } 190 191 #if __STDC__ 192 #include <stdarg.h> 193 #else 194 #include <varargs.h> 195 #endif 196 197 void 198 #if __STDC__ 199 logerr(const char *fmt, ...) 200 #else 201 logerr(fmt, va_alist) 202 char *fmt; 203 va_dcl 204 #endif 205 { 206 va_list ap; 207 #if __STDC__ 208 va_start(ap, fmt); 209 #else 210 va_start(ap); 211 #endif 212 (void)vsyslog(LOG_ERR, fmt, ap); 213 va_end(ap); 214 exit(1); 215 /* NOTREACHED */ 216 } 217