1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)net.c 8.4 (Berkeley) 4/28/95"; 40 #else 41 static const char rcsid[] = 42 "$FreeBSD$"; 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/types.h> 47 #include <sys/param.h> 48 #include <sys/socket.h> 49 #include <netinet/in.h> 50 #include <arpa/inet.h> 51 #include <netdb.h> 52 #include <db.h> 53 #include <err.h> 54 #include <unistd.h> 55 #include <pwd.h> 56 #include <utmp.h> 57 #include <stdio.h> 58 #include <ctype.h> 59 #include <string.h> 60 #include <sys/uio.h> 61 #include <signal.h> 62 #include <limits.h> 63 #include "finger.h" 64 65 extern int lflag; /* XXX finger.h? */ 66 extern int Tflag; /* XXX finger.h? */ 67 68 static void cleanup(int sig);; 69 static int do_protocol(const char *name, const struct addrinfo *ai); 70 static void trying(const struct addrinfo *ai); 71 72 void 73 netfinger(name) 74 char *name; 75 { 76 int error, multi; 77 char *host; 78 struct addrinfo *ai, *ai0; 79 static struct addrinfo hint; 80 81 host = strrchr(name, '@'); 82 if (host == 0) 83 return; 84 *host++ = '\0'; 85 signal(SIGALRM, cleanup); 86 alarm(TIME_LIMIT); 87 88 hint.ai_flags = AI_CANONNAME; 89 hint.ai_family = PF_UNSPEC; 90 hint.ai_socktype = SOCK_STREAM; 91 92 error = getaddrinfo(host, "finger", &hint, &ai0); 93 if (error) { 94 warnx("%s: %s", host, gai_strerror(error)); 95 return; 96 } 97 98 multi = (ai0->ai_next) != 0; 99 100 /* ai_canonname may not be filled in if the user specified an IP. */ 101 if (ai0->ai_canonname == 0) 102 printf("[%s]\n", host); 103 else 104 printf("[%s]\n", ai0->ai_canonname); 105 106 for (ai = ai0; ai != 0; ai = ai->ai_next) { 107 if (multi) 108 trying(ai); 109 110 error = do_protocol(name, ai); 111 if (!error) 112 break; 113 } 114 alarm(0); 115 freeaddrinfo(ai0); 116 } 117 118 static int 119 do_protocol(const char *name, const struct addrinfo *ai) 120 { 121 int cnt, line_len, s; 122 register FILE *fp; 123 register int c, lastc; 124 struct iovec iov[3]; 125 struct msghdr msg; 126 127 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 128 if (s < 0) { 129 warn("socket(%d, %d, %d)", ai->ai_family, ai->ai_socktype, 130 ai->ai_protocol); 131 return -1; 132 } 133 134 msg.msg_name = (void *)ai->ai_addr; 135 msg.msg_namelen = ai->ai_addrlen; 136 msg.msg_iov = iov; 137 msg.msg_iovlen = 0; 138 msg.msg_control = 0; 139 msg.msg_controllen = 0; 140 msg.msg_flags = 0; 141 142 /* -l flag for remote fingerd */ 143 if (lflag) { 144 iov[msg.msg_iovlen].iov_base = "/W "; 145 iov[msg.msg_iovlen++].iov_len = 3; 146 } 147 /* send the name followed by <CR><LF> */ 148 iov[msg.msg_iovlen].iov_base = (char *)name; 149 iov[msg.msg_iovlen++].iov_len = strlen(name); 150 iov[msg.msg_iovlen].iov_base = "\r\n"; 151 iov[msg.msg_iovlen++].iov_len = 2; 152 153 /* 154 * -T disables data-on-SYN: compatibility option to finger broken 155 * hosts. Also, the implicit-open API is broken on IPv6, so do 156 * the explicit connect there, too. 157 */ 158 if ((Tflag || ai->ai_addr->sa_family == AF_INET6) 159 && connect(s, ai->ai_addr, ai->ai_addrlen) < 0) { 160 warn("connect"); 161 close(s); 162 return -1; 163 } 164 165 if (sendmsg(s, &msg, 0) < 0) { 166 warn("sendmsg"); 167 close(s); 168 return -1; 169 } 170 171 /* 172 * Read from the remote system; once we're connected, we assume some 173 * data. If none arrives, we hang until the user interrupts. 174 * 175 * If we see a <CR> or a <CR> with the high bit set, treat it as 176 * a newline; if followed by a newline character, only output one 177 * newline. 178 * 179 * Otherwise, all high bits are stripped; if it isn't printable and 180 * it isn't a space, we can simply set the 7th bit. Every ASCII 181 * character with bit 7 set is printable. 182 */ 183 lastc = 0; 184 if ((fp = fdopen(s, "r")) != NULL) { 185 cnt = 0; 186 line_len = 0; 187 while ((c = getc(fp)) != EOF) { 188 if (++cnt > OUTPUT_MAX) { 189 printf("\n\n Output truncated at %d bytes...\n", 190 cnt - 1); 191 break; 192 } 193 if (c == 0x0d) { 194 if (lastc == '\r') /* ^M^M - skip dupes */ 195 continue; 196 c = '\n'; 197 lastc = '\r'; 198 } else { 199 if (!isprint(c) && !isspace(c)) { 200 c &= 0x7f; 201 c |= 0x40; 202 } 203 if (lastc != '\r' || c != '\n') 204 lastc = c; 205 else { 206 lastc = '\n'; 207 continue; 208 } 209 } 210 putchar(c); 211 if (c != '\n' && ++line_len > _POSIX2_LINE_MAX) { 212 putchar('\\'); 213 putchar('\n'); 214 lastc = '\r'; 215 } 216 if (lastc == '\n' || lastc == '\r') 217 line_len = 0; 218 } 219 if (ferror(fp)) { 220 /* 221 * Assume that whatever it was set errno... 222 */ 223 warn("reading from network"); 224 } 225 if (lastc != '\n') 226 putchar('\n'); 227 228 fclose(fp); 229 } 230 return 0; 231 } 232 233 static void 234 trying(const struct addrinfo *ai) 235 { 236 char buf[NI_MAXHOST]; 237 238 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof buf, 239 (char *)0, 0, NI_NUMERICHOST) != 0) 240 return; /* XXX can't happen */ 241 242 printf("Trying %s...\n", buf); 243 } 244 245 void 246 cleanup(int sig) 247 { 248 #define ERRSTR "Timed out.\n" 249 write(STDERR_FILENO, ERRSTR, sizeof ERRSTR); 250 exit(1); 251 } 252 253