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/* $OpenBSD: net.c,v 1.13 2015/01/16 06:40:07 deraadt Exp $ */ |
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/* |
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* Copyright (c) 1989 The Regents of the University of California. |
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* All rights reserved. |
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* |
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* This code is derived from software contributed to Berkeley by |
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* Tony Nardo of the Johns Hopkins University/Applied Physics Lab. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <arpa/inet.h> |
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#include <netdb.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <ctype.h> |
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#include <unistd.h> |
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#include <err.h> |
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#include "finger.h" |
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#include "extern.h" |
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void |
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netfinger(name) |
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char *name; |
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{ |
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FILE *fp; |
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int c, lastc; |
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int s; |
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char *host; |
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struct addrinfo hints, *res0, *res; |
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int error; |
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char hbuf[NI_MAXHOST]; |
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lastc = 0; |
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if (!(host = strrchr(name, '@'))) |
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return; |
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*host++ = '\0'; |
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memset(&hints, 0, sizeof(hints)); |
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hints.ai_family = PF_UNSPEC; |
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hints.ai_socktype = SOCK_STREAM; |
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error = getaddrinfo(host, "finger", &hints, &res0); |
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if (error) { |
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warnx("%s", gai_strerror(error)); |
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return; |
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} |
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s = -1; |
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for (res = res0; res; res = res->ai_next) { |
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if ((s = socket(res->ai_family, res->ai_socktype, |
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res->ai_protocol)) < 0) { |
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continue; |
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} |
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if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { |
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(void)close(s); |
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s = -1; |
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continue; |
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} |
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break; |
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} |
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if (s < 0) { |
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perror("finger"); |
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freeaddrinfo(res0); |
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return; |
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} |
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/* have network connection; identify the host connected with */ |
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if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, sizeof(hbuf), |
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NULL, 0, NI_NUMERICHOST) != 0) { |
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strlcpy(hbuf, "(invalid)", sizeof hbuf); |
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} |
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(void)printf("[%s/%s]\n", host, hbuf); |
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freeaddrinfo(res0); |
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/* -l flag for remote fingerd */ |
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if (lflag) |
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write(s, "/W ", 3); |
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/* send the name followed by <CR><LF> */ |
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(void)write(s, name, strlen(name)); |
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(void)write(s, "\r\n", 2); |
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/* |
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* Read from the remote system; once we're connected, we assume some |
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* data. If none arrives, we hang until the user interrupts. |
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* |
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* If we see a <CR> or a <CR> with the high bit set, treat it as |
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* a newline; if followed by a newline character, only output one |
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* newline. |
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* |
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* Otherwise, all high bits are stripped; if it isn't printable and |
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* it isn't a space, we can simply set the 7th bit. Every ASCII |
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* character with bit 7 set is printable. |
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*/ |
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if ((fp = fdopen(s, "r")) != NULL) |
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while ((c = getc(fp)) != EOF) { |
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c &= 0x7f; |
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if (c == '\r') { |
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if (lastc == '\r') |
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continue; |
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c = '\n'; |
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lastc = '\r'; |
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} else { |
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if (!isprint(c) && !isspace(c)) |
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c |= 0x40; |
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if (lastc != '\r' || c != '\n') |
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lastc = c; |
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else { |
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lastc = '\n'; |
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continue; |
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} |
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} |
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putchar(c); |
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} |
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if (lastc != '\n') |
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putchar('\n'); |
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(void)fclose(fp); |
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} |