1 /* $OpenBSD: net.c,v 1.14 2019/06/28 13:35:01 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/socket.h> 36 #include <netinet/in.h> 37 #include <arpa/inet.h> 38 #include <netdb.h> 39 #include <stdio.h> 40 #include <string.h> 41 #include <ctype.h> 42 #include <unistd.h> 43 #include <err.h> 44 #include "finger.h" 45 #include "extern.h" 46 47 void 48 netfinger(name) 49 char *name; 50 { 51 FILE *fp; 52 int c, lastc; 53 int s; 54 char *host; 55 struct addrinfo hints, *res0, *res; 56 int error; 57 char hbuf[NI_MAXHOST]; 58 59 lastc = 0; 60 if (!(host = strrchr(name, '@'))) 61 return; 62 *host++ = '\0'; 63 memset(&hints, 0, sizeof(hints)); 64 hints.ai_family = PF_UNSPEC; 65 hints.ai_socktype = SOCK_STREAM; 66 error = getaddrinfo(host, "finger", &hints, &res0); 67 if (error) { 68 warnx("%s", gai_strerror(error)); 69 return; 70 } 71 72 s = -1; 73 for (res = res0; res; res = res->ai_next) { 74 if ((s = socket(res->ai_family, res->ai_socktype, 75 res->ai_protocol)) == -1) { 76 continue; 77 } 78 if (connect(s, res->ai_addr, res->ai_addrlen) == -1) { 79 (void)close(s); 80 s = -1; 81 continue; 82 } 83 84 break; 85 } 86 87 if (s == -1) { 88 perror("finger"); 89 freeaddrinfo(res0); 90 return; 91 } 92 93 /* have network connection; identify the host connected with */ 94 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, sizeof(hbuf), 95 NULL, 0, NI_NUMERICHOST) != 0) { 96 strlcpy(hbuf, "(invalid)", sizeof hbuf); 97 } 98 (void)printf("[%s/%s]\n", host, hbuf); 99 100 freeaddrinfo(res0); 101 102 /* -l flag for remote fingerd */ 103 if (lflag) 104 write(s, "/W ", 3); 105 /* send the name followed by <CR><LF> */ 106 (void)write(s, name, strlen(name)); 107 (void)write(s, "\r\n", 2); 108 109 /* 110 * Read from the remote system; once we're connected, we assume some 111 * data. If none arrives, we hang until the user interrupts. 112 * 113 * If we see a <CR> or a <CR> with the high bit set, treat it as 114 * a newline; if followed by a newline character, only output one 115 * newline. 116 * 117 * Otherwise, all high bits are stripped; if it isn't printable and 118 * it isn't a space, we can simply set the 7th bit. Every ASCII 119 * character with bit 7 set is printable. 120 */ 121 if ((fp = fdopen(s, "r")) != NULL) 122 while ((c = getc(fp)) != EOF) { 123 c &= 0x7f; 124 if (c == '\r') { 125 if (lastc == '\r') 126 continue; 127 c = '\n'; 128 lastc = '\r'; 129 } else { 130 if (!isprint(c) && !isspace(c)) 131 c |= 0x40; 132 if (lastc != '\r' || c != '\n') 133 lastc = c; 134 else { 135 lastc = '\n'; 136 continue; 137 } 138 } 139 putchar(c); 140 } 141 if (lastc != '\n') 142 putchar('\n'); 143 (void)fclose(fp); 144 } 145