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 void 66 cleanup(sig) 67 int sig; 68 { 69 exit(0); 70 } 71 72 void 73 netfinger(name) 74 char *name; 75 { 76 int cnt; 77 int line_len; 78 extern int lflag; 79 extern int Tflag; 80 register FILE *fp; 81 register int c, lastc; 82 struct in_addr defaddr; 83 struct hostent *hp, def; 84 struct servent *sp; 85 struct sockaddr_in sin; 86 int s; 87 char *alist[1], *host; 88 struct iovec iov[3]; 89 struct msghdr msg; 90 91 if (!(host = rindex(name, '@'))) 92 return; 93 *host++ = '\0'; 94 signal(SIGALRM, cleanup); 95 (void) alarm(TIME_LIMIT); 96 if (isdigit(*host) && (defaddr.s_addr = inet_addr(host)) != -1) { 97 def.h_name = host; 98 def.h_addr_list = alist; 99 def.h_addr = (char *)&defaddr; 100 def.h_length = sizeof(struct in_addr); 101 def.h_addrtype = AF_INET; 102 def.h_aliases = 0; 103 hp = &def; 104 } else if (!(hp = gethostbyname(host))) { 105 warnx("unknown host: %s", host); 106 return; 107 } 108 if (!(sp = getservbyname("finger", "tcp"))) { 109 warnx("tcp/finger: unknown service"); 110 return; 111 } 112 sin.sin_family = hp->h_addrtype; 113 bcopy(hp->h_addr, (char *)&sin.sin_addr, MIN(hp->h_length,sizeof(sin.sin_addr))); 114 sin.sin_port = sp->s_port; 115 if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0) { 116 perror("finger: socket"); 117 return; 118 } 119 120 /* have network connection; identify the host connected with */ 121 (void)printf("[%s]\n", hp->h_name); 122 123 msg.msg_name = (void *)&sin; 124 msg.msg_namelen = sizeof sin; 125 msg.msg_iov = iov; 126 msg.msg_iovlen = 0; 127 msg.msg_control = 0; 128 msg.msg_controllen = 0; 129 msg.msg_flags = 0; 130 131 /* -l flag for remote fingerd */ 132 if (lflag) { 133 iov[msg.msg_iovlen].iov_base = "/W "; 134 iov[msg.msg_iovlen++].iov_len = 3; 135 } 136 /* send the name followed by <CR><LF> */ 137 iov[msg.msg_iovlen].iov_base = name; 138 iov[msg.msg_iovlen++].iov_len = strlen(name); 139 iov[msg.msg_iovlen].iov_base = "\r\n"; 140 iov[msg.msg_iovlen++].iov_len = 2; 141 142 /* -T disables T/TCP: compatibility option to finger broken hosts */ 143 if (Tflag && connect(s, (struct sockaddr *)&sin, sizeof (sin))) { 144 perror("finger: connect"); 145 return; 146 } 147 148 if (sendmsg(s, &msg, 0) < 0) { 149 perror("finger: sendmsg"); 150 close(s); 151 return; 152 } 153 154 /* 155 * Read from the remote system; once we're connected, we assume some 156 * data. If none arrives, we hang until the user interrupts. 157 * 158 * If we see a <CR> or a <CR> with the high bit set, treat it as 159 * a newline; if followed by a newline character, only output one 160 * newline. 161 * 162 * Otherwise, all high bits are stripped; if it isn't printable and 163 * it isn't a space, we can simply set the 7th bit. Every ASCII 164 * character with bit 7 set is printable. 165 */ 166 lastc = 0; 167 if ((fp = fdopen(s, "r")) != NULL) { 168 cnt = 0; 169 line_len = 0; 170 while ((c = getc(fp)) != EOF) { 171 if (++cnt > OUTPUT_MAX) { 172 printf("\n\n Output truncated at %d bytes...\n", 173 cnt - 1); 174 break; 175 } 176 if (c == 0x0d) { 177 if (lastc == '\r') /* ^M^M - skip dupes */ 178 continue; 179 c = '\n'; 180 lastc = '\r'; 181 } else { 182 if (!isprint(c) && !isspace(c)) { 183 c &= 0x7f; 184 c |= 0x40; 185 } 186 if (lastc != '\r' || c != '\n') 187 lastc = c; 188 else { 189 lastc = '\n'; 190 continue; 191 } 192 } 193 putchar(c); 194 if (c != '\n' && ++line_len > _POSIX2_LINE_MAX) { 195 putchar('\\'); 196 putchar('\n'); 197 lastc = '\r'; 198 } 199 if (lastc == '\n' || lastc == '\r') 200 line_len = 0; 201 } 202 if (lastc != '\n') 203 putchar('\n'); 204 205 if (ferror(fp)) { 206 /* 207 * Assume that whatever it was set errno... 208 */ 209 perror("finger: read"); 210 } 211 (void)fclose(fp); 212 } 213 } 214