1 /* $NetBSD: net.c,v 1.9 1997/05/17 19:42:25 pk Exp $ */ 2 3 /* 4 * Copyright (c) 1989 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #ifndef lint 40 /*static char sccsid[] = "from: @(#)net.c 5.5 (Berkeley) 6/1/90";*/ 41 static char rcsid[] = "$NetBSD: net.c,v 1.9 1997/05/17 19:42:25 pk Exp $"; 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <sys/socket.h> 46 #include <netinet/in.h> 47 #include <arpa/inet.h> 48 #include <netdb.h> 49 #include <stdio.h> 50 #include <string.h> 51 #include <ctype.h> 52 #include <unistd.h> 53 #include "finger.h" 54 #include "extern.h" 55 56 void 57 netfinger(name) 58 char *name; 59 { 60 FILE *fp; 61 int c, lastc; 62 struct hostent *hp; 63 struct servent *sp; 64 struct sockaddr_in sin; 65 int s; 66 char *host; 67 68 lastc = 0; 69 if (!(host = strrchr(name, '@'))) 70 return; 71 *host++ = '\0'; 72 if (inet_aton(host, &sin.sin_addr) == 0) { 73 hp = gethostbyname(host); 74 if (hp == 0) { 75 (void)fprintf(stderr, 76 "finger: unknown host: %s\n", host); 77 return; 78 } 79 sin.sin_family = hp->h_addrtype; 80 bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length); 81 host = hp->h_name; 82 } else 83 sin.sin_family = AF_INET; 84 if (!(sp = getservbyname("finger", "tcp"))) { 85 (void)fprintf(stderr, "finger: tcp/finger: unknown service\n"); 86 return; 87 } 88 sin.sin_port = sp->s_port; 89 if ((s = socket(sin.sin_family, SOCK_STREAM, 0)) < 0) { 90 perror("finger: socket"); 91 return; 92 } 93 94 /* have network connection; identify the host connected with */ 95 (void)printf("[%s]\n", host); 96 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 97 perror("finger: connect"); 98 (void)close(s); 99 return; 100 } 101 102 /* -l flag for remote fingerd */ 103 if (lflag) 104 write(s, "/W ", 3); 105 /* send the name followed by <CR><LF> */ 106 (void)write(s, name, strlen(name)); 107 (void)write(s, "\r\n", 2); 108 109 /* 110 * Read from the remote system; once we're connected, we assume some 111 * data. If none arrives, we hang until the user interrupts. 112 * 113 * If we see a <CR> or a <CR> with the high bit set, treat it as 114 * a newline; if followed by a newline character, only output one 115 * newline. 116 * 117 * Otherwise, all high bits are stripped; if it isn't printable and 118 * it isn't a space, we can simply set the 7th bit. Every ASCII 119 * character with bit 7 set is printable. 120 */ 121 if ((fp = fdopen(s, "r")) != NULL) 122 while ((c = getc(fp)) != EOF) { 123 c &= 0x7f; 124 if (c == '\r') { 125 if (lastc == '\r') 126 continue; 127 c = '\n'; 128 lastc = '\r'; 129 } else { 130 if (!isprint(c) && !isspace(c)) 131 c |= 0x40; 132 if (lastc != '\r' || c != '\n') 133 lastc = c; 134 else { 135 lastc = '\n'; 136 continue; 137 } 138 } 139 putchar(c); 140 } 141 if (lastc != '\n') 142 putchar('\n'); 143 (void)fclose(fp); 144 } 145