1 /* $OpenBSD: net.c,v 1.12 2009/10/27 23:59:38 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 1989 The Regents of the University of California. 5 * 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/param.h> 36 #include <sys/socket.h> 37 #include <netinet/in.h> 38 #include <arpa/inet.h> 39 #include <netdb.h> 40 #include <stdio.h> 41 #include <string.h> 42 #include <ctype.h> 43 #include <unistd.h> 44 #include <err.h> 45 #include "finger.h" 46 #include "extern.h" 47 48 void 49 netfinger(name) 50 char *name; 51 { 52 FILE *fp; 53 int c, lastc; 54 int s; 55 char *host; 56 struct addrinfo hints, *res0, *res; 57 int error; 58 char hbuf[NI_MAXHOST]; 59 60 lastc = 0; 61 if (!(host = strrchr(name, '@'))) 62 return; 63 *host++ = '\0'; 64 memset(&hints, 0, sizeof(hints)); 65 hints.ai_family = PF_UNSPEC; 66 hints.ai_socktype = SOCK_STREAM; 67 error = getaddrinfo(host, "finger", &hints, &res0); 68 if (error) { 69 warnx("%s", gai_strerror(error)); 70 return; 71 } 72 73 s = -1; 74 for (res = res0; res; res = res->ai_next) { 75 if ((s = socket(res->ai_family, res->ai_socktype, 76 res->ai_protocol)) < 0) { 77 continue; 78 } 79 if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { 80 (void)close(s); 81 s = -1; 82 continue; 83 } 84 85 break; 86 } 87 88 if (s < 0) { 89 perror("finger"); 90 freeaddrinfo(res0); 91 return; 92 } 93 94 /* have network connection; identify the host connected with */ 95 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, sizeof(hbuf), 96 NULL, 0, NI_NUMERICHOST) != 0) { 97 strlcpy(hbuf, "(invalid)", sizeof hbuf); 98 } 99 (void)printf("[%s/%s]\n", host, hbuf); 100 101 freeaddrinfo(res0); 102 103 /* -l flag for remote fingerd */ 104 if (lflag) 105 write(s, "/W ", 3); 106 /* send the name followed by <CR><LF> */ 107 (void)write(s, name, strlen(name)); 108 (void)write(s, "\r\n", 2); 109 110 /* 111 * Read from the remote system; once we're connected, we assume some 112 * data. If none arrives, we hang until the user interrupts. 113 * 114 * If we see a <CR> or a <CR> with the high bit set, treat it as 115 * a newline; if followed by a newline character, only output one 116 * newline. 117 * 118 * Otherwise, all high bits are stripped; if it isn't printable and 119 * it isn't a space, we can simply set the 7th bit. Every ASCII 120 * character with bit 7 set is printable. 121 */ 122 if ((fp = fdopen(s, "r")) != NULL) 123 while ((c = getc(fp)) != EOF) { 124 c &= 0x7f; 125 if (c == '\r') { 126 if (lastc == '\r') 127 continue; 128 c = '\n'; 129 lastc = '\r'; 130 } else { 131 if (!isprint(c) && !isspace(c)) 132 c |= 0x40; 133 if (lastc != '\r' || c != '\n') 134 lastc = c; 135 else { 136 lastc = '\n'; 137 continue; 138 } 139 } 140 putchar(c); 141 } 142 if (lastc != '\n') 143 putchar('\n'); 144 (void)fclose(fp); 145 } 146