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 "$Id$"; 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/types.h> 47 #include <sys/socket.h> 48 #include <netinet/in.h> 49 #include <arpa/inet.h> 50 #include <netdb.h> 51 #include <db.h> 52 #include <err.h> 53 #include <unistd.h> 54 #include <pwd.h> 55 #include <utmp.h> 56 #include <stdio.h> 57 #include <ctype.h> 58 #include <string.h> 59 #include <sys/uio.h> 60 #include "finger.h" 61 62 void 63 netfinger(name) 64 char *name; 65 { 66 extern int lflag; 67 extern int Tflag; 68 register FILE *fp; 69 register int c, lastc; 70 struct in_addr defaddr; 71 struct hostent *hp, def; 72 struct servent *sp; 73 struct sockaddr_in sin; 74 int s; 75 char *alist[1], *host; 76 struct iovec iov[3]; 77 struct msghdr msg; 78 79 if (!(host = rindex(name, '@'))) 80 return; 81 *host++ = '\0'; 82 if (isdigit(*host) && (defaddr.s_addr = inet_addr(host)) != -1) { 83 def.h_name = host; 84 def.h_addr_list = alist; 85 def.h_addr = (char *)&defaddr; 86 def.h_length = sizeof(struct in_addr); 87 def.h_addrtype = AF_INET; 88 def.h_aliases = 0; 89 hp = &def; 90 } else if (!(hp = gethostbyname(host))) { 91 warnx("unknown host: %s", host); 92 return; 93 } 94 if (!(sp = getservbyname("finger", "tcp"))) { 95 warnx("tcp/finger: unknown service"); 96 return; 97 } 98 sin.sin_family = hp->h_addrtype; 99 bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length); 100 sin.sin_port = sp->s_port; 101 if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0) { 102 perror("finger: socket"); 103 return; 104 } 105 106 /* have network connection; identify the host connected with */ 107 (void)printf("[%s]\n", hp->h_name); 108 109 msg.msg_name = (void *)&sin; 110 msg.msg_namelen = sizeof sin; 111 msg.msg_iov = iov; 112 msg.msg_iovlen = 0; 113 msg.msg_control = 0; 114 msg.msg_controllen = 0; 115 msg.msg_flags = MSG_EOF; 116 117 /* -l flag for remote fingerd */ 118 if (lflag) { 119 iov[msg.msg_iovlen].iov_base = "/W "; 120 iov[msg.msg_iovlen++].iov_len = 3; 121 } 122 /* send the name followed by <CR><LF> */ 123 iov[msg.msg_iovlen].iov_base = name; 124 iov[msg.msg_iovlen++].iov_len = strlen(name); 125 iov[msg.msg_iovlen].iov_base = "\r\n"; 126 iov[msg.msg_iovlen++].iov_len = 2; 127 128 /* -T disables T/TCP: compatibility option to finger broken hosts */ 129 if (Tflag && connect(s, (struct sockaddr *)&sin, sizeof (sin))) { 130 perror("finger: connect"); 131 return; 132 } 133 134 if (sendmsg(s, &msg, MSG_EOF) < 0) { 135 perror("finger: sendmsg"); 136 close(s); 137 return; 138 } 139 140 /* 141 * Read from the remote system; once we're connected, we assume some 142 * data. If none arrives, we hang until the user interrupts. 143 * 144 * If we see a <CR> or a <CR> with the high bit set, treat it as 145 * a newline; if followed by a newline character, only output one 146 * newline. 147 * 148 * Otherwise, all high bits are stripped; if it isn't printable and 149 * it isn't a space, we can simply set the 7th bit. Every ASCII 150 * character with bit 7 set is printable. 151 */ 152 lastc = 0; 153 if ((fp = fdopen(s, "r")) != NULL) { 154 while ((c = getc(fp)) != EOF) { 155 if (c == 0x0d) { 156 if (lastc == '\r') /* ^M^M - skip dupes */ 157 continue; 158 c = '\n'; 159 lastc = '\r'; 160 } else { 161 if (!isprint(c) && !isspace(c)) { 162 c &= 0x7f; 163 c |= 0x40; 164 } 165 if (lastc != '\r' || c != '\n') 166 lastc = c; 167 else { 168 lastc = '\n'; 169 continue; 170 } 171 } 172 putchar(c); 173 } 174 if (lastc != '\n') 175 putchar('\n'); 176 177 if (ferror(fp)) { 178 /* 179 * Assume that whatever it was set errno... 180 */ 181 perror("finger: read"); 182 } 183 (void)fclose(fp); 184 } 185 } 186