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