1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * 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 /*static char sccsid[] = "from: @(#)net.c 5.5 (Berkeley) 6/1/90";*/ 39 static char rcsid[] = "$Id: net.c,v 1.6 1995/05/21 15:06:52 mycroft Exp $"; 40 #endif /* not lint */ 41 42 #include <sys/types.h> 43 #include <sys/socket.h> 44 #include <netinet/in.h> 45 #include <arpa/inet.h> 46 #include <netdb.h> 47 #include <stdio.h> 48 #include <string.h> 49 #include <ctype.h> 50 51 netfinger(name) 52 char *name; 53 { 54 extern int lflag; 55 register FILE *fp; 56 register int c, lastc; 57 struct hostent *hp, def; 58 struct servent *sp; 59 struct sockaddr_in sin; 60 int s; 61 char *alist[1], *host, *rindex(); 62 63 if (!(host = rindex(name, '@'))) 64 return; 65 *host++ = NULL; 66 if (inet_aton(host, &sin.sin_addr) == 0) { 67 hp = gethostbyname(host); 68 if (hp == 0) { 69 (void)fprintf(stderr, 70 "finger: unknown host: %s\n", host); 71 return; 72 } 73 sin.sin_family = hp->h_addrtype; 74 bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length); 75 host = hp->h_name; 76 } else 77 sin.sin_family = AF_INET; 78 if (!(sp = getservbyname("finger", "tcp"))) { 79 (void)fprintf(stderr, "finger: tcp/finger: unknown service\n"); 80 return; 81 } 82 sin.sin_port = sp->s_port; 83 if ((s = socket(sin.sin_family, SOCK_STREAM, 0)) < 0) { 84 perror("finger: socket"); 85 return; 86 } 87 88 /* have network connection; identify the host connected with */ 89 (void)printf("[%s]\n", host); 90 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 91 perror("finger: connect"); 92 (void)close(s); 93 return; 94 } 95 96 /* -l flag for remote fingerd */ 97 if (lflag) 98 write(s, "/W ", 3); 99 /* send the name followed by <CR><LF> */ 100 (void)write(s, name, strlen(name)); 101 (void)write(s, "\r\n", 2); 102 103 /* 104 * Read from the remote system; once we're connected, we assume some 105 * data. If none arrives, we hang until the user interrupts. 106 * 107 * If we see a <CR> or a <CR> with the high bit set, treat it as 108 * a newline; if followed by a newline character, only output one 109 * newline. 110 * 111 * Otherwise, all high bits are stripped; if it isn't printable and 112 * it isn't a space, we can simply set the 7th bit. Every ASCII 113 * character with bit 7 set is printable. 114 */ 115 if (fp = fdopen(s, "r")) 116 while ((c = getc(fp)) != EOF) { 117 c &= 0x7f; 118 if (c == '\r') { 119 if (lastc == '\r') 120 continue; 121 c = '\n'; 122 lastc = '\r'; 123 } else { 124 if (!isprint(c) && !isspace(c)) 125 c |= 0x40; 126 if (lastc != '\r' || c != '\n') 127 lastc = c; 128 else { 129 lastc = '\n'; 130 continue; 131 } 132 } 133 putchar(c); 134 } 135 if (lastc != '\n') 136 putchar('\n'); 137 (void)fclose(fp); 138 } 139