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: net.c,v 1.9 1997/08/01 20:10:44 wollman Exp $"; 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 "finger.h" 62 63 void 64 netfinger(name) 65 char *name; 66 { 67 extern int lflag; 68 extern int Tflag; 69 register FILE *fp; 70 register int c, lastc; 71 struct in_addr defaddr; 72 struct hostent *hp, def; 73 struct servent *sp; 74 struct sockaddr_in sin; 75 int s; 76 char *alist[1], *host; 77 struct iovec iov[3]; 78 struct msghdr msg; 79 80 if (!(host = rindex(name, '@'))) 81 return; 82 *host++ = '\0'; 83 if (isdigit(*host) && (defaddr.s_addr = inet_addr(host)) != -1) { 84 def.h_name = host; 85 def.h_addr_list = alist; 86 def.h_addr = (char *)&defaddr; 87 def.h_length = sizeof(struct in_addr); 88 def.h_addrtype = AF_INET; 89 def.h_aliases = 0; 90 hp = &def; 91 } else if (!(hp = gethostbyname(host))) { 92 warnx("unknown host: %s", host); 93 return; 94 } 95 if (!(sp = getservbyname("finger", "tcp"))) { 96 warnx("tcp/finger: unknown service"); 97 return; 98 } 99 sin.sin_family = hp->h_addrtype; 100 bcopy(hp->h_addr, (char *)&sin.sin_addr, MIN(hp->h_length,sizeof(sin.sin_addr))); 101 sin.sin_port = sp->s_port; 102 if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0) { 103 perror("finger: socket"); 104 return; 105 } 106 107 /* have network connection; identify the host connected with */ 108 (void)printf("[%s]\n", hp->h_name); 109 110 msg.msg_name = (void *)&sin; 111 msg.msg_namelen = sizeof sin; 112 msg.msg_iov = iov; 113 msg.msg_iovlen = 0; 114 msg.msg_control = 0; 115 msg.msg_controllen = 0; 116 msg.msg_flags = 0; 117 118 /* -l flag for remote fingerd */ 119 if (lflag) { 120 iov[msg.msg_iovlen].iov_base = "/W "; 121 iov[msg.msg_iovlen++].iov_len = 3; 122 } 123 /* send the name followed by <CR><LF> */ 124 iov[msg.msg_iovlen].iov_base = name; 125 iov[msg.msg_iovlen++].iov_len = strlen(name); 126 iov[msg.msg_iovlen].iov_base = "\r\n"; 127 iov[msg.msg_iovlen++].iov_len = 2; 128 129 /* -T disables T/TCP: compatibility option to finger broken hosts */ 130 if (Tflag && connect(s, (struct sockaddr *)&sin, sizeof (sin))) { 131 perror("finger: connect"); 132 return; 133 } 134 135 if (sendmsg(s, &msg, 0) < 0) { 136 perror("finger: sendmsg"); 137 close(s); 138 return; 139 } 140 141 /* 142 * Read from the remote system; once we're connected, we assume some 143 * data. If none arrives, we hang until the user interrupts. 144 * 145 * If we see a <CR> or a <CR> with the high bit set, treat it as 146 * a newline; if followed by a newline character, only output one 147 * newline. 148 * 149 * Otherwise, all high bits are stripped; if it isn't printable and 150 * it isn't a space, we can simply set the 7th bit. Every ASCII 151 * character with bit 7 set is printable. 152 */ 153 lastc = 0; 154 if ((fp = fdopen(s, "r")) != NULL) { 155 while ((c = getc(fp)) != EOF) { 156 if (c == 0x0d) { 157 if (lastc == '\r') /* ^M^M - skip dupes */ 158 continue; 159 c = '\n'; 160 lastc = '\r'; 161 } else { 162 if (!isprint(c) && !isspace(c)) { 163 c &= 0x7f; 164 c |= 0x40; 165 } 166 if (lastc != '\r' || c != '\n') 167 lastc = c; 168 else { 169 lastc = '\n'; 170 continue; 171 } 172 } 173 putchar(c); 174 } 175 if (lastc != '\n') 176 putchar('\n'); 177 178 if (ferror(fp)) { 179 /* 180 * Assume that whatever it was set errno... 181 */ 182 perror("finger: read"); 183 } 184 (void)fclose(fp); 185 } 186 } 187