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