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