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 1.4 1994/12/24 16:33:53 cgd Exp $"; 40 #endif /* not lint */ 41 42 #include <sys/types.h> 43 #include <sys/socket.h> 44 #include <netinet/in.h> 45 #include <netdb.h> 46 #include <stdio.h> 47 #include <string.h> 48 #include <ctype.h> 49 50 netfinger(name) 51 char *name; 52 { 53 extern int lflag; 54 register FILE *fp; 55 register int c, lastc; 56 struct in_addr defaddr; 57 struct hostent *hp, def; 58 struct servent *sp; 59 struct sockaddr_in sin; 60 int s; 61 char *alist[1], *host, *rindex(); 62 u_long inet_addr(); 63 64 if (!(host = rindex(name, '@'))) 65 return; 66 *host++ = NULL; 67 if (!(hp = gethostbyname(host))) { 68 defaddr.s_addr = inet_addr(host); 69 if (defaddr.s_addr == -1) { 70 (void)fprintf(stderr, 71 "finger: unknown host: %s\n", host); 72 return; 73 } 74 def.h_name = host; 75 def.h_addr_list = alist; 76 def.h_addr = (char *)&defaddr; 77 def.h_length = sizeof(struct in_addr); 78 def.h_addrtype = AF_INET; 79 def.h_aliases = 0; 80 hp = &def; 81 } 82 if (!(sp = getservbyname("finger", "tcp"))) { 83 (void)fprintf(stderr, "finger: tcp/finger: unknown service\n"); 84 return; 85 } 86 sin.sin_family = hp->h_addrtype; 87 bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length); 88 sin.sin_port = sp->s_port; 89 if ((s = socket(hp->h_addrtype, 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", hp->h_name); 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")) 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