diff options
Diffstat (limited to 'adv_cmds/finger/net.c')
| -rw-r--r-- | adv_cmds/finger/net.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/adv_cmds/finger/net.c b/adv_cmds/finger/net.c new file mode 100644 index 0000000..cf0699d --- /dev/null +++ b/adv_cmds/finger/net.c @@ -0,0 +1,250 @@ +/* + * Copyright (c) 1989, 1993 + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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. + */ + +#if 0 +#ifndef lint +static char sccsid[] = "@(#)net.c 8.4 (Berkeley) 4/28/95"; +#endif +#endif + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD: src/usr.bin/finger/net.c,v 1.23 2004/05/16 22:08:15 stefanf Exp $"); + +#include <sys/param.h> +#include <sys/socket.h> +#include <sys/uio.h> +#include <ctype.h> +#include <db.h> +#include <err.h> +#include <netdb.h> +#include <pwd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <utmpx.h> +#include "finger.h" + +static void cleanup(int sig); +static int do_protocol(const char *name, const struct addrinfo *ai); +static void trying(const struct addrinfo *ai); + +void +netfinger(char *name) +{ + int error, multi; + char *host; + struct addrinfo *ai, *ai0; + static struct addrinfo hint; + + host = strrchr(name, '@'); + if (host == 0) + return; + *host++ = '\0'; + signal(SIGALRM, cleanup); + alarm(TIME_LIMIT); + + hint.ai_flags = AI_CANONNAME; + hint.ai_family = family; + hint.ai_socktype = SOCK_STREAM; + + error = getaddrinfo(host, "finger", &hint, &ai0); + if (error) { + warnx("%s: %s", host, gai_strerror(error)); + return; + } + + multi = (ai0->ai_next) != 0; + + /* ai_canonname may not be filled in if the user specified an IP. */ + if (ai0->ai_canonname == 0) + printf("[%s]\n", host); + else + printf("[%s]\n", ai0->ai_canonname); + + for (ai = ai0; ai != 0; ai = ai->ai_next) { + if (multi) + trying(ai); + + error = do_protocol(name, ai); + if (!error) + break; + } + alarm(0); + freeaddrinfo(ai0); +} + +static int +do_protocol(const char *name, const struct addrinfo *ai) +{ + int cnt, line_len, s; + FILE *fp; + int c, lastc; + struct iovec iov[3]; + struct msghdr msg; + static char slash_w[] = "/W "; + static char neteol[] = "\r\n"; + + s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); + if (s < 0) { + warn("socket(%d, %d, %d)", ai->ai_family, ai->ai_socktype, + ai->ai_protocol); + return -1; + } + + msg.msg_name = (void *)ai->ai_addr; + msg.msg_namelen = ai->ai_addrlen; + msg.msg_iov = iov; + msg.msg_iovlen = 0; + msg.msg_control = 0; + msg.msg_controllen = 0; + msg.msg_flags = 0; + + /* -l flag for remote fingerd */ + if (lflag) { + iov[msg.msg_iovlen].iov_base = slash_w; + iov[msg.msg_iovlen++].iov_len = 3; + } + /* send the name followed by <CR><LF> */ + iov[msg.msg_iovlen].iov_base = strdup(name); + iov[msg.msg_iovlen++].iov_len = strlen(name); + iov[msg.msg_iovlen].iov_base = neteol; + iov[msg.msg_iovlen++].iov_len = 2; + +#ifdef __APPLE__ + if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) { +#else + /* + * -T disables data-on-SYN: compatibility option to finger broken + * hosts. Also, the implicit-open API is broken on IPv6, so do + * the explicit connect there, too. + */ + if ((Tflag || ai->ai_addr->sa_family == AF_INET6) + && connect(s, ai->ai_addr, ai->ai_addrlen) < 0) { +#endif + warn("connect"); + close(s); + return -1; + } + + if (sendmsg(s, &msg, 0) < 0) { + warn("sendmsg"); + close(s); + return -1; + } + + /* + * 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. + */ + lastc = 0; + if ((fp = fdopen(s, "r")) != NULL) { + cnt = 0; + line_len = 0; + while ((c = getc(fp)) != EOF) { + if (++cnt > OUTPUT_MAX) { + printf("\n\n Output truncated at %d bytes...\n", + cnt - 1); + break; + } + if (c == 0x0d) { + if (lastc == '\r') /* ^M^M - skip dupes */ + continue; + c = '\n'; + lastc = '\r'; + } else { + if (!isprint(c) && !isspace(c)) { + c &= 0x7f; + c |= 0x40; + } + if (lastc != '\r' || c != '\n') + lastc = c; + else { + lastc = '\n'; + continue; + } + } + putchar(c); + if (c != '\n' && ++line_len > _POSIX2_LINE_MAX) { + putchar('\\'); + putchar('\n'); + lastc = '\r'; + } + if (lastc == '\n' || lastc == '\r') + line_len = 0; + } + if (ferror(fp)) { + /* + * Assume that whatever it was set errno... + */ + warn("reading from network"); + } + if (lastc != '\n') + putchar('\n'); + + fclose(fp); + } + return 0; +} + +static void +trying(const struct addrinfo *ai) +{ + char buf[NI_MAXHOST]; + + if (getnameinfo(ai->ai_addr, ai->ai_addrlen, buf, sizeof buf, + (char *)0, 0, NI_NUMERICHOST) != 0) + return; /* XXX can't happen */ + + printf("Trying %s...\n", buf); +} + +void +cleanup(int sig __unused) +{ +#define ERRSTR "Timed out.\n" + write(STDERR_FILENO, ERRSTR, sizeof ERRSTR); + exit(1); +} + |