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 8.4 (Berkeley) 4/28/95"; 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 <sys/uio.h> 54 #include "finger.h" 55 56 void 57 netfinger(name) 58 char *name; 59 { 60 extern int lflag; 61 extern int Tflag; 62 register FILE *fp; 63 register int c, lastc; 64 struct in_addr defaddr; 65 struct hostent *hp, def; 66 struct servent *sp; 67 struct sockaddr_in sin; 68 int s; 69 char *alist[1], *host; 70 struct iovec iov[3]; 71 struct msghdr msg; 72 73 if (!(host = rindex(name, '@'))) 74 return; 75 *host++ = NULL; 76 if (isdigit(*host) && (defaddr.s_addr = inet_addr(host)) != -1) { 77 def.h_name = host; 78 def.h_addr_list = alist; 79 def.h_addr = (char *)&defaddr; 80 def.h_length = sizeof(struct in_addr); 81 def.h_addrtype = AF_INET; 82 def.h_aliases = 0; 83 hp = &def; 84 } else if (!(hp = gethostbyname(host))) { 85 (void)fprintf(stderr, 86 "finger: unknown host: %s\n", host); 87 return; 88 } 89 if (!(sp = getservbyname("finger", "tcp"))) { 90 (void)fprintf(stderr, "finger: tcp/finger: unknown service\n"); 91 return; 92 } 93 sin.sin_family = hp->h_addrtype; 94 bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length); 95 sin.sin_port = sp->s_port; 96 if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) < 0) { 97 perror("finger: socket"); 98 return; 99 } 100 101 /* have network connection; identify the host connected with */ 102 (void)printf("[%s]\n", hp->h_name); 103 104 msg.msg_name = (void *)&sin; 105 msg.msg_namelen = sizeof sin; 106 msg.msg_iov = iov; 107 msg.msg_iovlen = 0; 108 msg.msg_control = 0; 109 msg.msg_controllen = 0; 110 msg.msg_flags = MSG_EOF; 111 112 /* -l flag for remote fingerd */ 113 if (lflag) { 114 iov[msg.msg_iovlen].iov_base = "/W "; 115 iov[msg.msg_iovlen++].iov_len = 3; 116 } 117 /* send the name followed by <CR><LF> */ 118 iov[msg.msg_iovlen].iov_base = name; 119 iov[msg.msg_iovlen++].iov_len = strlen(name); 120 iov[msg.msg_iovlen].iov_base = "\r\n"; 121 iov[msg.msg_iovlen++].iov_len = 2; 122 123 /* -T disables T/TCP: compatibility option to finger broken hosts */ 124 if (Tflag && connect(s, (struct sockaddr *)&sin, sizeof (sin))) { 125 perror("finger: connect"); 126 return; 127 } 128 129 if (sendmsg(s, &msg, MSG_EOF) < 0) { 130 perror("finger: sendmsg"); 131 close(s); 132 return; 133 } 134 135 /* 136 * Read from the remote system; once we're connected, we assume some 137 * data. If none arrives, we hang until the user interrupts. 138 * 139 * If we see a <CR> or a <CR> with the high bit set, treat it as 140 * a newline; if followed by a newline character, only output one 141 * newline. 142 * 143 * Otherwise, all high bits are stripped; if it isn't printable and 144 * it isn't a space, we can simply set the 7th bit. Every ASCII 145 * character with bit 7 set is printable. 146 */ 147 lastc = 0; 148 if ((fp = fdopen(s, "r")) != NULL) { 149 while ((c = getc(fp)) != EOF) { 150 if (c == 0x0d) { 151 if (lastc == '\r') /* ^M^M - skip dupes */ 152 continue; 153 c = '\n'; 154 lastc = '\r'; 155 } else { 156 if (!isprint(c) && !isspace(c)) { 157 c &= 0x7f; 158 c |= 0x40; 159 } 160 if (lastc != '\r' || c != '\n') 161 lastc = c; 162 else { 163 lastc = '\n'; 164 continue; 165 } 166 } 167 putchar(c); 168 } 169 if (lastc != '\n') 170 putchar('\n'); 171 172 if (ferror(fp)) { 173 /* 174 * Assume that whatever it was set errno... 175 */ 176 perror("finger: read"); 177 } 178 (void)fclose(fp); 179 } 180 } 181