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 extern sa_family_t family; 64 65 static void cleanup(int sig);; 66 static int do_protocol(const char *name, const struct addrinfo *ai); 67 static void trying(const struct addrinfo *ai); 68 69 void 70 netfinger(name) 71 char *name; 72 { 73 int error, multi; 74 char *host; 75 struct addrinfo *ai, *ai0; 76 static struct addrinfo hint; 77 78 host = strrchr(name, '@'); 79 if (host == 0) 80 return; 81 *host++ = '\0'; 82 signal(SIGALRM, cleanup); 83 alarm(TIME_LIMIT); 84 85 hint.ai_flags = AI_CANONNAME; 86 hint.ai_family = family; 87 hint.ai_socktype = SOCK_STREAM; 88 89 error = getaddrinfo(host, "finger", &hint, &ai0); 90 if (error) { 91 warnx("%s: %s", host, gai_strerror(error)); 92 return; 93 } 94 95 multi = (ai0->ai_next) != 0; 96 97 /* ai_canonname may not be filled in if the user specified an IP. */ 98 if (ai0->ai_canonname == 0) 99 printf("[%s]\n", host); 100 else 101 printf("[%s]\n", ai0->ai_canonname); 102 103 for (ai = ai0; ai != 0; ai = ai->ai_next) { 104 if (multi) 105 trying(ai); 106 107 error = do_protocol(name, ai); 108 if (!error) 109 break; 110 } 111 alarm(0); 112 freeaddrinfo(ai0); 113 } 114 115 static int 116 do_protocol(const char *name, const struct addrinfo *ai) 117 { 118 int cnt, line_len, s; 119 FILE *fp; 120 int c, lastc; 121 struct iovec iov[3]; 122 struct msghdr msg; 123 static char slash_w[] = "/W "; 124 static char neteol[] = "\n\r"; 125 126 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 127 if (s < 0) { 128 warn("socket(%d, %d, %d)", ai->ai_family, ai->ai_socktype, 129 ai->ai_protocol); 130 return -1; 131 } 132 133 msg.msg_name = (void *)ai->ai_addr; 134 msg.msg_namelen = ai->ai_addrlen; 135 msg.msg_iov = iov; 136 msg.msg_iovlen = 0; 137 msg.msg_control = 0; 138 msg.msg_controllen = 0; 139 msg.msg_flags = 0; 140 141 /* -l flag for remote fingerd */ 142 if (lflag) { 143 iov[msg.msg_iovlen].iov_base = slash_w; 144 iov[msg.msg_iovlen++].iov_len = 3; 145 } 146 /* send the name followed by <CR><LF> */ 147 iov[msg.msg_iovlen].iov_base = strdup(name); 148 iov[msg.msg_iovlen++].iov_len = strlen(name); 149 iov[msg.msg_iovlen].iov_base = neteol; 150 iov[msg.msg_iovlen++].iov_len = 2; 151 152 /* 153 * -T disables data-on-SYN: compatibility option to finger broken 154 * hosts. Also, the implicit-open API is broken on IPv6, so do 155 * the explicit connect there, too. 156 */ 157 if ((Tflag || ai->ai_addr->sa_family == AF_INET6) 158 && connect(s, ai->ai_addr, ai->ai_addrlen) < 0) { 159 warn("connect"); 160 close(s); 161 return -1; 162 } 163 164 if (sendmsg(s, &msg, 0) < 0) { 165 warn("sendmsg"); 166 close(s); 167 return -1; 168 } 169 170 /* 171 * Read from the remote system; once we're connected, we assume some 172 * data. If none arrives, we hang until the user interrupts. 173 * 174 * If we see a <CR> or a <CR> with the high bit set, treat it as 175 * a newline; if followed by a newline character, only output one 176 * newline. 177 * 178 * Otherwise, all high bits are stripped; if it isn't printable and 179 * it isn't a space, we can simply set the 7th bit. Every ASCII 180 * character with bit 7 set is printable. 181 */ 182 lastc = 0; 183 if ((fp = fdopen(s, "r")) != NULL) { 184 cnt = 0; 185 line_len = 0; 186 while ((c = getc(fp)) != EOF) { 187 if (++cnt > OUTPUT_MAX) { 188 printf("\n\n Output truncated at %d bytes...\n", 189 cnt - 1); 190 break; 191 } 192 if (c == 0x0d) { 193 if (lastc == '\r') /* ^M^M - skip dupes */ 194 continue; 195 c = '\n'; 196 lastc = '\r'; 197 } else { 198 if (!isprint(c) && !isspace(c)) { 199 c &= 0x7f; 200 c |= 0x40; 201 } 202 if (lastc != '\r' || c != '\n') 203 lastc = c; 204 else { 205 lastc = '\n'; 206 continue; 207 } 208 } 209 putchar(c); 210 if (c != '\n' && ++line_len > _POSIX2_LINE_MAX) { 211 putchar('\\'); 212 putchar('\n'); 213 lastc = '\r'; 214 } 215 if (lastc == '\n' || lastc == '\r') 216 line_len = 0; 217 } 218 if (ferror(fp)) { 219 /* 220 * Assume that whatever it was set errno... 221 */ 222 warn("reading from network"); 223 } 224 if (lastc != '\n') 225 putchar('\n'); 226 227 fclose(fp); 228 } 229 return 0; 230 } 231 232 static void 233 trying(const struct addrinfo *ai) 234 { 235 char buf[NI_MAXHOST]; 236 237 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof buf, 238 (char *)0, 0, NI_NUMERICHOST) != 0) 239 return; /* XXX can't happen */ 240 241 printf("Trying %s...\n", buf); 242 } 243 244 void 245 cleanup(int sig __unused) 246 { 247 #define ERRSTR "Timed out.\n" 248 write(STDERR_FILENO, ERRSTR, sizeof ERRSTR); 249 exit(1); 250 } 251 252