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 #include "precomp.h" 38 39 void 40 netfinger(char *name) 41 { 42 extern int lflag; 43 char c, lastc; 44 struct in_addr defaddr; 45 struct hostent *hp, def; 46 struct servent *sp; 47 struct sockaddr_in sin; 48 SOCKET s; 49 char *alist[1], *host; 50 51 /* If this is a local request */ 52 if (!(host = rindex(name, '@'))) 53 return; 54 55 *host++ = '\0'; 56 if (isdigit(*host) && (defaddr.s_addr = inet_addr(host)) != (unsigned long)-1) { 57 def.h_name = host; 58 def.h_addr_list = alist; 59 def.h_addr = (char *)&defaddr; 60 def.h_length = sizeof(struct in_addr); 61 def.h_addrtype = AF_INET; 62 def.h_aliases = 0; 63 hp = &def; 64 } else if (!(hp = gethostbyname(host))) { 65 (void)fprintf(stderr, 66 "finger: unknown host: %s\n", host); 67 return; 68 } 69 if (!(sp = getservbyname("finger", "tcp"))) { 70 (void)fprintf(stderr, "finger: tcp/finger: unknown service\n"); 71 return; 72 } 73 sin.sin_family = hp->h_addrtype; 74 bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length); 75 sin.sin_port = sp->s_port; 76 if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) == INVALID_SOCKET) { 77 perror("finger: socket"); 78 return; 79 } 80 81 /* have network connection; identify the host connected with */ 82 (void)printf("[%s]\n", hp->h_name); 83 if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 84 fprintf(stderr, "finger: connect rc = %d", WSAGetLastError()); 85 (void)closesocket(s); 86 return; 87 } 88 89 /* -l flag for remote fingerd */ 90 if (lflag) 91 send(s, "/W ", 3, 0); 92 /* send the name followed by <CR><LF> */ 93 send(s, name, strlen(name), 0); 94 send(s, "\r\n", 2, 0); 95 96 /* 97 * Read from the remote system; once we're connected, we assume some 98 * data. If none arrives, we hang until the user interrupts. 99 * 100 * If we see a <CR> or a <CR> with the high bit set, treat it as 101 * a newline; if followed by a newline character, only output one 102 * newline. 103 * 104 * Otherwise, all high bits are stripped; if it isn't printable and 105 * it isn't a space, we can simply set the 7th bit. Every ASCII 106 * character with bit 7 set is printable. 107 */ 108 lastc = 0; 109 while (recv(s, &c, 1, 0) == 1) { 110 c &= 0x7f; 111 if (c == 0x0d) { 112 if (lastc == '\r') /* ^M^M - skip dupes */ 113 continue; 114 c = '\n'; 115 lastc = '\r'; 116 } else { 117 if (!isprint(c) && !isspace(c)) 118 c |= 0x40; 119 if (lastc != '\r' || c != '\n') 120 lastc = c; 121 else { 122 lastc = '\n'; 123 continue; 124 } 125 } 126 putchar(c); 127 } 128 if (lastc != '\n') 129 putchar('\n'); 130 putchar('\n'); 131 (void)closesocket(s); 132 } 133