1 /* $NetBSD: net.c,v 1.23 2009/04/12 06:18:54 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)net.c 8.4 (Berkeley) 4/28/95"; 39 #else 40 __RCSID("$NetBSD: net.c,v 1.23 2009/04/12 06:18:54 lukem Exp $"); 41 #endif 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <sys/socket.h> 46 47 #include <netinet/in.h> 48 49 #include <arpa/inet.h> 50 51 #include <netdb.h> 52 #include <time.h> 53 #include <db.h> 54 #include <unistd.h> 55 #include <pwd.h> 56 #include <stdio.h> 57 #include <string.h> 58 #include <ctype.h> 59 #include <err.h> 60 61 #include "utmpentry.h" 62 63 #include "finger.h" 64 #include "extern.h" 65 66 void 67 netfinger(char *name) 68 { 69 FILE *fp; 70 int c, lastc; 71 int s; 72 char *host; 73 struct addrinfo hints, *res, *res0; 74 int error; 75 const char *emsg = NULL; 76 77 lastc = 0; 78 if (!(host = strrchr(name, '@'))) 79 return; 80 *host++ = '\0'; 81 memset(&hints, 0, sizeof(hints)); 82 hints.ai_family = PF_UNSPEC; 83 hints.ai_socktype = SOCK_STREAM; 84 hints.ai_flags = AI_CANONNAME; 85 error = getaddrinfo(host, "finger", &hints, &res0); 86 if (error) { 87 warnx("%s: %s", gai_strerror(error), host); 88 return; 89 } 90 91 s = -1; 92 for (res = res0; res; res = res->ai_next) { 93 s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); 94 if (s < 0) { 95 emsg = "socket"; 96 continue; 97 } 98 99 if (connect(s, res->ai_addr, res->ai_addrlen)) { 100 close(s); 101 s = -1; 102 emsg = "connect"; 103 continue; 104 } 105 106 break; 107 } 108 if (s < 0) { 109 if (emsg != NULL) 110 warn("%s", emsg); 111 return; 112 } 113 114 /* have network connection; identify the host connected with */ 115 (void)printf("[%s]\n", res0->ai_canonname ? res0->ai_canonname : host); 116 117 /* -l flag for remote fingerd */ 118 if (lflag) 119 write(s, "/W ", 3); 120 /* send the name followed by <CR><LF> */ 121 (void)write(s, name, strlen(name)); 122 (void)write(s, "\r\n", 2); 123 124 /* 125 * Read from the remote system; once we're connected, we assume some 126 * data. If none arrives, we hang until the user interrupts. 127 * 128 * If we see a <CR> followed by a newline character, only output 129 * one newline. 130 * 131 * If a character isn't printable and it isn't a space, we strip the 132 * 8th bit and set the 7th bit. Every ASCII character with bit 7 set 133 * is printable. 134 */ 135 if ((fp = fdopen(s, "r")) != NULL) 136 while ((c = getc(fp)) != EOF) { 137 if (c == '\r') { 138 if (lastc == '\r') /* ^M^M - skip dupes */ 139 continue; 140 c = '\n'; 141 lastc = '\r'; 142 } else { 143 if (!(eightflag || isprint(c) || isspace(c))) { 144 c &= 0x7f; 145 c |= 0x40; 146 } 147 if (lastc != '\r' || c != '\n') 148 lastc = c; 149 else { 150 lastc = '\n'; 151 continue; 152 } 153 } 154 putchar(c); 155 } 156 if (lastc != '\n') 157 putchar('\n'); 158 (void)fclose(fp); 159 } 160