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 #if 0 38 #ifndef lint 39 static char sccsid[] = "@(#)net.c 8.4 (Berkeley) 4/28/95"; 40 #endif 41 #endif 42 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include <sys/param.h> 47 #include <sys/socket.h> 48 #include <sys/uio.h> 49 #include <ctype.h> 50 #include <db.h> 51 #include <err.h> 52 #include <netdb.h> 53 #include <pwd.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 #include <utmp.h> 59 #include "finger.h" 60 61 extern int lflag; /* XXX finger.h? */ 62 extern int Tflag; /* XXX finger.h? */ 63 64 static void cleanup(int sig);; 65 static int do_protocol(const char *name, const struct addrinfo *ai); 66 static void trying(const struct addrinfo *ai); 67 68 void 69 netfinger(name) 70 char *name; 71 { 72 int error, multi; 73 char *host; 74 struct addrinfo *ai, *ai0; 75 static struct addrinfo hint; 76 77 host = strrchr(name, '@'); 78 if (host == 0) 79 return; 80 *host++ = '\0'; 81 signal(SIGALRM, cleanup); 82 alarm(TIME_LIMIT); 83 84 hint.ai_flags = AI_CANONNAME; 85 hint.ai_family = PF_UNSPEC; 86 hint.ai_socktype = SOCK_STREAM; 87 88 error = getaddrinfo(host, "finger", &hint, &ai0); 89 if (error) { 90 warnx("%s: %s", host, gai_strerror(error)); 91 return; 92 } 93 94 multi = (ai0->ai_next) != 0; 95 96 /* ai_canonname may not be filled in if the user specified an IP. */ 97 if (ai0->ai_canonname == 0) 98 printf("[%s]\n", host); 99 else 100 printf("[%s]\n", ai0->ai_canonname); 101 102 for (ai = ai0; ai != 0; ai = ai->ai_next) { 103 if (multi) 104 trying(ai); 105 106 error = do_protocol(name, ai); 107 if (!error) 108 break; 109 } 110 alarm(0); 111 freeaddrinfo(ai0); 112 } 113 114 static int 115 do_protocol(const char *name, const struct addrinfo *ai) 116 { 117 int cnt, line_len, s; 118 FILE *fp; 119 int c, lastc; 120 struct iovec iov[3]; 121 struct msghdr msg; 122 static char slash_w[] = "/W "; 123 static char neteol[] = "\n\r"; 124 125 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 126 if (s < 0) { 127 warn("socket(%d, %d, %d)", ai->ai_family, ai->ai_socktype, 128 ai->ai_protocol); 129 return -1; 130 } 131 132 msg.msg_name = (void *)ai->ai_addr; 133 msg.msg_namelen = ai->ai_addrlen; 134 msg.msg_iov = iov; 135 msg.msg_iovlen = 0; 136 msg.msg_control = 0; 137 msg.msg_controllen = 0; 138 msg.msg_flags = 0; 139 140 /* -l flag for remote fingerd */ 141 if (lflag) { 142 iov[msg.msg_iovlen].iov_base = slash_w; 143 iov[msg.msg_iovlen++].iov_len = 3; 144 } 145 /* send the name followed by <CR><LF> */ 146 iov[msg.msg_iovlen].iov_base = strdup(name); 147 iov[msg.msg_iovlen++].iov_len = strlen(name); 148 iov[msg.msg_iovlen].iov_base = neteol; 149 iov[msg.msg_iovlen++].iov_len = 2; 150 151 /* 152 * -T disables data-on-SYN: compatibility option to finger broken 153 * hosts. Also, the implicit-open API is broken on IPv6, so do 154 * the explicit connect there, too. 155 */ 156 if ((Tflag || ai->ai_addr->sa_family == AF_INET6) 157 && connect(s, ai->ai_addr, ai->ai_addrlen) < 0) { 158 warn("connect"); 159 close(s); 160 return -1; 161 } 162 163 if (sendmsg(s, &msg, 0) < 0) { 164 warn("sendmsg"); 165 close(s); 166 return -1; 167 } 168 169 /* 170 * Read from the remote system; once we're connected, we assume some 171 * data. If none arrives, we hang until the user interrupts. 172 * 173 * If we see a <CR> or a <CR> with the high bit set, treat it as 174 * a newline; if followed by a newline character, only output one 175 * newline. 176 * 177 * Otherwise, all high bits are stripped; if it isn't printable and 178 * it isn't a space, we can simply set the 7th bit. Every ASCII 179 * character with bit 7 set is printable. 180 */ 181 lastc = 0; 182 if ((fp = fdopen(s, "r")) != NULL) { 183 cnt = 0; 184 line_len = 0; 185 while ((c = getc(fp)) != EOF) { 186 if (++cnt > OUTPUT_MAX) { 187 printf("\n\n Output truncated at %d bytes...\n", 188 cnt - 1); 189 break; 190 } 191 if (c == 0x0d) { 192 if (lastc == '\r') /* ^M^M - skip dupes */ 193 continue; 194 c = '\n'; 195 lastc = '\r'; 196 } else { 197 if (!isprint(c) && !isspace(c)) { 198 c &= 0x7f; 199 c |= 0x40; 200 } 201 if (lastc != '\r' || c != '\n') 202 lastc = c; 203 else { 204 lastc = '\n'; 205 continue; 206 } 207 } 208 putchar(c); 209 if (c != '\n' && ++line_len > _POSIX2_LINE_MAX) { 210 putchar('\\'); 211 putchar('\n'); 212 lastc = '\r'; 213 } 214 if (lastc == '\n' || lastc == '\r') 215 line_len = 0; 216 } 217 if (ferror(fp)) { 218 /* 219 * Assume that whatever it was set errno... 220 */ 221 warn("reading from network"); 222 } 223 if (lastc != '\n') 224 putchar('\n'); 225 226 fclose(fp); 227 } 228 return 0; 229 } 230 231 static void 232 trying(const struct addrinfo *ai) 233 { 234 char buf[NI_MAXHOST]; 235 236 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof buf, 237 (char *)0, 0, NI_NUMERICHOST) != 0) 238 return; /* XXX can't happen */ 239 240 printf("Trying %s...\n", buf); 241 } 242 243 void 244 cleanup(int sig __unused) 245 { 246 #define ERRSTR "Timed out.\n" 247 write(STDERR_FILENO, ERRSTR, sizeof ERRSTR); 248 exit(1); 249 } 250 251