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 static char sccsid[] = "@(#)net.c 8.3 (Berkeley) 1/2/94"; 39 #endif /* not lint */ 40 41 #include <sys/types.h> 42 #include <sys/socket.h> 43 #include <netinet/in.h> 44 #include <arpa/inet.h> 45 #include <netdb.h> 46 #include <db.h> 47 #include <unistd.h> 48 #include <pwd.h> 49 #include <utmp.h> 50 #include <stdio.h> 51 #include <ctype.h> 52 #include <string.h> 53 #include "finger.h" 54 55 void 56 netfinger(name) 57 char *name; 58 { 59 extern int lflag; 60 register FILE *fp; 61 register int c, lastc; 62 struct in_addr defaddr; 63 struct hostent *hp, def; 64 struct servent *sp; 65 struct sockaddr_in sin; 66 int s; 67 char *alist[1], *host; 68 69 if (!(host = rindex(name, '@'))) 70 return; 71 *host++ = NULL; 72 if (isdigit(*host) && (defaddr.s_addr = inet_addr(host)) != -1) { 73 def.h_name = host; 74 def.h_addr_list = alist; 75 def.h_addr = (char *)&defaddr; 76 def.h_length = sizeof(struct in_addr); 77 def.h_addrtype = AF_INET; 78 def.h_aliases = 0; 79 hp = &def; 80 } else if (!(hp = gethostbyname(host))) { 81 (void)fprintf(stderr, 82 "finger: unknown host: %s\n", host); 83 return; 84 } 85 if (!(sp = getservbyname("finger", "tcp"))) { 86 (void)fprintf(stderr, "finger: tcp/finger: unknown service\n"); 87 return; 88 } 89 sin.sin_family = hp->h_addrtype; 90 bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length); 91 sin.sin_port = sp->s_port; 92 if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0) { 93 perror("finger: socket"); 94 return; 95 } 96 97 /* have network connection; identify the host connected with */ 98 (void)printf("[%s]\n", hp->h_name); 99 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 100 perror("finger: connect"); 101 (void)close(s); 102 return; 103 } 104 105 /* -l flag for remote fingerd */ 106 if (lflag) 107 write(s, "/W ", 3); 108 /* send the name followed by <CR><LF> */ 109 (void)write(s, name, strlen(name)); 110 (void)write(s, "\r\n", 2); 111 112 /* 113 * Read from the remote system; once we're connected, we assume some 114 * data. If none arrives, we hang until the user interrupts. 115 * 116 * If we see a <CR> or a <CR> with the high bit set, treat it as 117 * a newline; if followed by a newline character, only output one 118 * newline. 119 * 120 * Otherwise, all high bits are stripped; if it isn't printable and 121 * it isn't a space, we can simply set the 7th bit. Every ASCII 122 * character with bit 7 set is printable. 123 */ 124 if (fp = fdopen(s, "r")) 125 while ((c = getc(fp)) != EOF) { 126 c &= 0x7f; 127 if (c == 0x0d) { 128 if (lastc == '\r') /* ^M^M - skip dupes */ 129 continue; 130 c = '\n'; 131 lastc = '\r'; 132 } else { 133 if (!isprint(c) && !isspace(c)) 134 c |= 0x40; 135 if (lastc != '\r' || c != '\n') 136 lastc = c; 137 else { 138 lastc = '\n'; 139 continue; 140 } 141 } 142 putchar(c); 143 } 144 if (lastc != '\n') 145 putchar('\n'); 146 putchar('\n'); 147 (void)fclose(fp); 148 } 149