1de7b4b805
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
814 lines
20 KiB
C
814 lines
20 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1983, 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/filio.h>
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#include <sys/ioccom.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/ucred.h>
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#include <sys/uio.h>
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#include <sys/utsname.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <syslog.h>
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#include <unistd.h>
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#include "inetd.h"
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static void chargen_dg(int, struct servtab *);
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static void chargen_stream(int, struct servtab *);
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static void daytime_dg(int, struct servtab *);
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static void daytime_stream(int, struct servtab *);
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static void discard_dg(int, struct servtab *);
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static void discard_stream(int, struct servtab *);
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static void echo_dg(int, struct servtab *);
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static void echo_stream(int, struct servtab *);
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static int get_line(int, char *, int);
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static void iderror(int, int, int, const char *);
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static void ident_stream(int, struct servtab *);
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static void initring(void);
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static uint32_t machtime(void);
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static void machtime_dg(int, struct servtab *);
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static void machtime_stream(int, struct servtab *);
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static char ring[128];
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static char *endring;
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struct biltin biltins[] = {
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/* Echo received data */
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{ "echo", SOCK_STREAM, 1, -1, echo_stream },
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{ "echo", SOCK_DGRAM, 0, 1, echo_dg },
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/* Internet /dev/null */
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{ "discard", SOCK_STREAM, 1, -1, discard_stream },
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{ "discard", SOCK_DGRAM, 0, 1, discard_dg },
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/* Return 32 bit time since 1900 */
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{ "time", SOCK_STREAM, 0, -1, machtime_stream },
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{ "time", SOCK_DGRAM, 0, 1, machtime_dg },
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/* Return human-readable time */
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{ "daytime", SOCK_STREAM, 0, -1, daytime_stream },
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{ "daytime", SOCK_DGRAM, 0, 1, daytime_dg },
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/* Familiar character generator */
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{ "chargen", SOCK_STREAM, 1, -1, chargen_stream },
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{ "chargen", SOCK_DGRAM, 0, 1, chargen_dg },
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{ "tcpmux", SOCK_STREAM, 1, -1, (bi_fn_t *)tcpmux },
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{ "auth", SOCK_STREAM, 1, -1, ident_stream },
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{ NULL, 0, 0, 0, NULL }
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};
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/*
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* RFC864 Character Generator Protocol. Generates character data without
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* any regard for input.
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*/
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static void
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initring(void)
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{
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int i;
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endring = ring;
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for (i = 0; i <= 128; ++i)
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if (isprint(i))
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*endring++ = i;
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}
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/* Character generator
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* The RFC says that we should send back a random number of
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* characters chosen from the range 0 to 512. We send LINESIZ+2.
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*/
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/* ARGSUSED */
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static void
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chargen_dg(int s, struct servtab *sep)
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{
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struct sockaddr_storage ss;
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static char *rs;
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int len;
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socklen_t size;
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char text[LINESIZ+2];
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if (endring == 0) {
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initring();
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rs = ring;
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}
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size = sizeof(ss);
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if (recvfrom(s, text, sizeof(text), 0,
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(struct sockaddr *)&ss, &size) < 0)
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return;
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if (check_loop((struct sockaddr *)&ss, sep))
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return;
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if ((len = endring - rs) >= LINESIZ)
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memmove(text, rs, LINESIZ);
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else {
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memmove(text, rs, len);
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memmove(text + len, ring, LINESIZ - len);
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}
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if (++rs == endring)
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rs = ring;
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text[LINESIZ] = '\r';
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text[LINESIZ + 1] = '\n';
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(void) sendto(s, text, sizeof(text), 0, (struct sockaddr *)&ss, size);
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}
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/* Character generator */
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/* ARGSUSED */
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static void
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chargen_stream(int s, struct servtab *sep)
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{
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int len;
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char *rs, text[LINESIZ+2];
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inetd_setproctitle(sep->se_service, s);
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if (!endring)
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initring();
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text[LINESIZ] = '\r';
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text[LINESIZ + 1] = '\n';
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for (rs = ring;;) {
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if ((len = endring - rs) >= LINESIZ)
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memmove(text, rs, LINESIZ);
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else {
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memmove(text, rs, len);
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memmove(text + len, ring, LINESIZ - len);
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}
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if (++rs == endring)
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rs = ring;
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if (write(s, text, sizeof(text)) != sizeof(text))
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break;
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}
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exit(0);
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}
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/*
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* RFC867 Daytime Protocol. Sends the current date and time as an ascii
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* character string without any regard for input.
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*/
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/* Return human-readable time of day */
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/* ARGSUSED */
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static void
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daytime_dg(int s, struct servtab *sep)
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{
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char buffer[256];
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time_t now;
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struct sockaddr_storage ss;
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socklen_t size;
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now = time((time_t *) 0);
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size = sizeof(ss);
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if (recvfrom(s, buffer, sizeof(buffer), 0,
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(struct sockaddr *)&ss, &size) < 0)
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return;
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if (check_loop((struct sockaddr *)&ss, sep))
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return;
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(void) sprintf(buffer, "%.24s\r\n", ctime(&now));
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(void) sendto(s, buffer, strlen(buffer), 0,
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(struct sockaddr *)&ss, size);
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}
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/* Return human-readable time of day */
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/* ARGSUSED */
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static void
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daytime_stream(int s, struct servtab *sep __unused)
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{
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char buffer[256];
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time_t now;
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now = time((time_t *) 0);
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(void) sprintf(buffer, "%.24s\r\n", ctime(&now));
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(void) send(s, buffer, strlen(buffer), MSG_EOF);
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}
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/*
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* RFC863 Discard Protocol. Any data received is thrown away and no response
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* is sent.
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*/
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/* Discard service -- ignore data */
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/* ARGSUSED */
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static void
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discard_dg(int s, struct servtab *sep __unused)
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{
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char buffer[BUFSIZE];
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(void) read(s, buffer, sizeof(buffer));
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}
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/* Discard service -- ignore data */
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/* ARGSUSED */
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static void
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discard_stream(int s, struct servtab *sep)
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{
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int ret;
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char buffer[BUFSIZE];
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inetd_setproctitle(sep->se_service, s);
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while (1) {
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while ((ret = read(s, buffer, sizeof(buffer))) > 0)
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;
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if (ret == 0 || errno != EINTR)
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break;
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}
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exit(0);
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}
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/*
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* RFC862 Echo Protocol. Any data received is sent back to the sender as
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* received.
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*/
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/* Echo service -- echo data back */
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/* ARGSUSED */
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static void
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echo_dg(int s, struct servtab *sep)
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{
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char buffer[65536]; /* Should be sizeof(max datagram). */
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int i;
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socklen_t size;
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struct sockaddr_storage ss;
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size = sizeof(ss);
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if ((i = recvfrom(s, buffer, sizeof(buffer), 0,
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(struct sockaddr *)&ss, &size)) < 0)
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return;
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if (check_loop((struct sockaddr *)&ss, sep))
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return;
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(void) sendto(s, buffer, i, 0, (struct sockaddr *)&ss, size);
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}
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/* Echo service -- echo data back */
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/* ARGSUSED */
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static void
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echo_stream(int s, struct servtab *sep)
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{
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char buffer[BUFSIZE];
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int i;
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inetd_setproctitle(sep->se_service, s);
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while ((i = read(s, buffer, sizeof(buffer))) > 0 &&
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write(s, buffer, i) > 0)
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;
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exit(0);
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}
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/*
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* RFC1413 Identification Protocol. Given a TCP port number pair, return a
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* character string which identifies the owner of that connection on the
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* server's system. Extended to allow for ~/.fakeid support and ~/.noident
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* support.
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*/
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/* RFC 1413 says the following are the only errors you can return. */
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#define ID_INVALID "INVALID-PORT" /* Port number improperly specified. */
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#define ID_NOUSER "NO-USER" /* Port not in use/not identifable. */
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#define ID_HIDDEN "HIDDEN-USER" /* Hiden at user's request. */
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#define ID_UNKNOWN "UNKNOWN-ERROR" /* Everything else. */
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/* Generic ident_stream error-sending func */
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/* ARGSUSED */
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static void
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iderror(int lport, int fport, int s, const char *er)
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{
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char *p;
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asprintf(&p, "%d , %d : ERROR : %s\r\n", lport, fport, er);
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if (p == NULL) {
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syslog(LOG_ERR, "asprintf: %m");
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exit(EX_OSERR);
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}
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send(s, p, strlen(p), MSG_EOF);
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free(p);
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exit(0);
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}
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/* Ident service (AKA "auth") */
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/* ARGSUSED */
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static void
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ident_stream(int s, struct servtab *sep)
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{
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struct utsname un;
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struct stat sb;
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struct sockaddr_in sin4[2];
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#ifdef INET6
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struct sockaddr_in6 sin6[2];
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#endif
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struct sockaddr_storage ss[2];
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struct xucred uc;
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struct timeval tv = {
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10,
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0
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}, to;
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struct passwd *pw = NULL;
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fd_set fdset;
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char buf[BUFSIZE], *p, **av, *osname = NULL, e;
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char idbuf[MAXLOGNAME] = ""; /* Big enough to hold uid in decimal. */
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socklen_t socklen;
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ssize_t ssize;
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size_t size, bufsiz;
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int c, fflag = 0, nflag = 0, rflag = 0, argc = 0;
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int gflag = 0, iflag = 0, Fflag = 0, getcredfail = 0, onreadlen;
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u_short lport, fport;
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inetd_setproctitle(sep->se_service, s);
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/*
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* Reset getopt() since we are a fork() but not an exec() from
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* a parent which used getopt() already.
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*/
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optind = 1;
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optreset = 1;
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/*
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* Take the internal argument vector and count it out to make an
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* argument count for getopt. This can be used for any internal
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* service to read arguments and use getopt() easily.
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*/
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for (av = sep->se_argv; *av; av++)
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argc++;
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if (argc) {
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int sec, usec;
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size_t i;
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u_int32_t rnd32;
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while ((c = getopt(argc, sep->se_argv, "d:fFgino:rt:")) != -1)
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switch (c) {
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case 'd':
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if (!gflag)
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strlcpy(idbuf, optarg, sizeof(idbuf));
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break;
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case 'f':
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fflag = 1;
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break;
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case 'F':
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fflag = 1;
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Fflag=1;
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break;
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case 'g':
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gflag = 1;
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rnd32 = 0; /* Shush, compiler. */
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/*
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* The number of bits in "rnd32" divided
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* by the number of bits needed per iteration
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* gives a more optimal way to reload the
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* random number only when necessary.
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*
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* 32 bits from arc4random corresponds to
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* about 6 base-36 digits, so we reseed evey 6.
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*/
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for (i = 0; i < sizeof(idbuf) - 1; i++) {
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static const char *const base36 =
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"0123456789"
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"abcdefghijklmnopqrstuvwxyz";
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if (i % 6 == 0)
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rnd32 = arc4random();
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idbuf[i] = base36[rnd32 % 36];
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rnd32 /= 36;
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}
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idbuf[i] = '\0';
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break;
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case 'i':
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iflag = 1;
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break;
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case 'n':
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nflag = 1;
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break;
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case 'o':
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osname = optarg;
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break;
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case 'r':
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rflag = 1;
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break;
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case 't':
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switch (sscanf(optarg, "%d.%d", &sec, &usec)) {
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case 2:
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tv.tv_usec = usec;
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/* FALLTHROUGH */
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case 1:
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tv.tv_sec = sec;
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break;
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default:
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if (debug)
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warnx("bad -t argument");
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break;
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}
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break;
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default:
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break;
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}
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}
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if (osname == NULL) {
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if (uname(&un) == -1)
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iderror(0, 0, s, ID_UNKNOWN);
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osname = un.sysname;
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}
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/*
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* We're going to prepare for and execute reception of a
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* packet of data from the user. The data is in the format
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* "local_port , foreign_port\r\n" (with local being the
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* server's port and foreign being the client's.)
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*/
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gettimeofday(&to, NULL);
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to.tv_sec += tv.tv_sec;
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to.tv_usec += tv.tv_usec;
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if (to.tv_usec >= 1000000) {
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to.tv_usec -= 1000000;
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to.tv_sec++;
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}
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size = 0;
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bufsiz = sizeof(buf) - 1;
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FD_ZERO(&fdset);
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while (bufsiz > 0) {
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gettimeofday(&tv, NULL);
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tv.tv_sec = to.tv_sec - tv.tv_sec;
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tv.tv_usec = to.tv_usec - tv.tv_usec;
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if (tv.tv_usec < 0) {
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tv.tv_usec += 1000000;
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tv.tv_sec--;
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}
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if (tv.tv_sec < 0)
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break;
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FD_SET(s, &fdset);
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if (select(s + 1, &fdset, NULL, NULL, &tv) == -1)
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iderror(0, 0, s, ID_UNKNOWN);
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if (ioctl(s, FIONREAD, &onreadlen) == -1)
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iderror(0, 0, s, ID_UNKNOWN);
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if ((size_t)onreadlen > bufsiz)
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onreadlen = bufsiz;
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ssize = read(s, &buf[size], (size_t)onreadlen);
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if (ssize == -1)
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iderror(0, 0, s, ID_UNKNOWN);
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else if (ssize == 0)
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break;
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bufsiz -= ssize;
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size += ssize;
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if (memchr(&buf[size - ssize], '\n', ssize) != NULL)
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break;
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}
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buf[size] = '\0';
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/* Read two characters, and check for a delimiting character */
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if (sscanf(buf, "%hu , %hu%c", &lport, &fport, &e) != 3 || isdigit(e))
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iderror(0, 0, s, ID_INVALID);
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/* Send garbage? */
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if (gflag)
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goto printit;
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/*
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* If not "real" (-r), send a HIDDEN-USER error for everything.
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* If -d is used to set a fallback username, this is used to
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* override it, and the fallback is returned instead.
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*/
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if (!rflag) {
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if (*idbuf == '\0')
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iderror(lport, fport, s, ID_HIDDEN);
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goto printit;
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}
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/*
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* We take the input and construct an array of two sockaddr_ins
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* which contain the local address information and foreign
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* address information, respectively, used to look up the
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|
* credentials for the socket (which are returned by the
|
|
* sysctl "net.inet.tcp.getcred" when we call it.)
|
|
*/
|
|
socklen = sizeof(ss[0]);
|
|
if (getsockname(s, (struct sockaddr *)&ss[0], &socklen) == -1)
|
|
iderror(lport, fport, s, ID_UNKNOWN);
|
|
socklen = sizeof(ss[1]);
|
|
if (getpeername(s, (struct sockaddr *)&ss[1], &socklen) == -1)
|
|
iderror(lport, fport, s, ID_UNKNOWN);
|
|
if (ss[0].ss_family != ss[1].ss_family)
|
|
iderror(lport, fport, s, ID_UNKNOWN);
|
|
size = sizeof(uc);
|
|
switch (ss[0].ss_family) {
|
|
case AF_INET:
|
|
sin4[0] = *(struct sockaddr_in *)&ss[0];
|
|
sin4[0].sin_port = htons(lport);
|
|
sin4[1] = *(struct sockaddr_in *)&ss[1];
|
|
sin4[1].sin_port = htons(fport);
|
|
if (sysctlbyname("net.inet.tcp.getcred", &uc, &size, sin4,
|
|
sizeof(sin4)) == -1)
|
|
getcredfail = errno;
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
sin6[0] = *(struct sockaddr_in6 *)&ss[0];
|
|
sin6[0].sin6_port = htons(lport);
|
|
sin6[1] = *(struct sockaddr_in6 *)&ss[1];
|
|
sin6[1].sin6_port = htons(fport);
|
|
if (sysctlbyname("net.inet6.tcp6.getcred", &uc, &size, sin6,
|
|
sizeof(sin6)) == -1)
|
|
getcredfail = errno;
|
|
break;
|
|
#endif
|
|
default: /* should not reach here */
|
|
getcredfail = EAFNOSUPPORT;
|
|
break;
|
|
}
|
|
if (getcredfail != 0 || uc.cr_version != XUCRED_VERSION) {
|
|
if (*idbuf == '\0')
|
|
iderror(lport, fport, s,
|
|
getcredfail == ENOENT ? ID_NOUSER : ID_UNKNOWN);
|
|
goto printit;
|
|
}
|
|
|
|
/* Look up the pw to get the username and home directory*/
|
|
errno = 0;
|
|
pw = getpwuid(uc.cr_uid);
|
|
if (pw == NULL)
|
|
iderror(lport, fport, s, errno == 0 ? ID_NOUSER : ID_UNKNOWN);
|
|
|
|
if (iflag)
|
|
snprintf(idbuf, sizeof(idbuf), "%u", (unsigned)pw->pw_uid);
|
|
else
|
|
strlcpy(idbuf, pw->pw_name, sizeof(idbuf));
|
|
|
|
/*
|
|
* If enabled, we check for a file named ".noident" in the user's
|
|
* home directory. If found, we return HIDDEN-USER.
|
|
*/
|
|
if (nflag) {
|
|
if (asprintf(&p, "%s/.noident", pw->pw_dir) == -1)
|
|
iderror(lport, fport, s, ID_UNKNOWN);
|
|
if (lstat(p, &sb) == 0) {
|
|
free(p);
|
|
iderror(lport, fport, s, ID_HIDDEN);
|
|
}
|
|
free(p);
|
|
}
|
|
|
|
/*
|
|
* Here, if enabled, we read a user's ".fakeid" file in their
|
|
* home directory. It consists of a line containing the name
|
|
* they want.
|
|
*/
|
|
if (fflag) {
|
|
int fakeid_fd;
|
|
|
|
/*
|
|
* Here we set ourself to effectively be the user, so we don't
|
|
* open any files we have no permission to open, especially
|
|
* symbolic links to sensitive root-owned files or devices.
|
|
*/
|
|
if (initgroups(pw->pw_name, pw->pw_gid) == -1)
|
|
iderror(lport, fport, s, ID_UNKNOWN);
|
|
if (seteuid(pw->pw_uid) == -1)
|
|
iderror(lport, fport, s, ID_UNKNOWN);
|
|
/*
|
|
* We can't stat() here since that would be a race
|
|
* condition.
|
|
* Therefore, we open the file we have permissions to open
|
|
* and if it's not a regular file, we close it and end up
|
|
* returning the user's real username.
|
|
*/
|
|
if (asprintf(&p, "%s/.fakeid", pw->pw_dir) == -1)
|
|
iderror(lport, fport, s, ID_UNKNOWN);
|
|
fakeid_fd = open(p, O_RDONLY | O_NONBLOCK);
|
|
free(p);
|
|
if (fakeid_fd == -1 || fstat(fakeid_fd, &sb) == -1 ||
|
|
!S_ISREG(sb.st_mode))
|
|
goto fakeid_fail;
|
|
|
|
if ((ssize = read(fakeid_fd, buf, sizeof(buf) - 1)) < 0)
|
|
goto fakeid_fail;
|
|
buf[ssize] = '\0';
|
|
|
|
/*
|
|
* Usually, the file will have the desired identity
|
|
* in the form "identity\n". Allow for leading white
|
|
* space and trailing white space/end of line.
|
|
*/
|
|
p = buf;
|
|
p += strspn(p, " \t");
|
|
p[strcspn(p, " \t\r\n")] = '\0';
|
|
if (strlen(p) > MAXLOGNAME - 1) /* Too long (including nul)? */
|
|
p[MAXLOGNAME - 1] = '\0';
|
|
|
|
/*
|
|
* If the name is a zero-length string or matches it
|
|
* the id or name of another user (unless permitted by -F)
|
|
* then it is invalid.
|
|
*/
|
|
if (*p == '\0')
|
|
goto fakeid_fail;
|
|
if (!Fflag) {
|
|
if (iflag) {
|
|
if (p[strspn(p, "0123456789")] == '\0' &&
|
|
getpwuid(atoi(p)) != NULL)
|
|
goto fakeid_fail;
|
|
} else {
|
|
if (getpwnam(p) != NULL)
|
|
goto fakeid_fail;
|
|
}
|
|
}
|
|
|
|
strlcpy(idbuf, p, sizeof(idbuf));
|
|
|
|
fakeid_fail:
|
|
if (fakeid_fd != -1)
|
|
close(fakeid_fd);
|
|
}
|
|
|
|
printit:
|
|
/* Finally, we make and send the reply. */
|
|
if (asprintf(&p, "%d , %d : USERID : %s : %s\r\n", lport, fport, osname,
|
|
idbuf) == -1) {
|
|
syslog(LOG_ERR, "asprintf: %m");
|
|
exit(EX_OSERR);
|
|
}
|
|
send(s, p, strlen(p), MSG_EOF);
|
|
free(p);
|
|
|
|
exit(0);
|
|
}
|
|
|
|
/*
|
|
* RFC738/868 Time Server.
|
|
* Return a machine readable date and time, in the form of the
|
|
* number of seconds since midnight, Jan 1, 1900. Since gettimeofday
|
|
* returns the number of seconds since midnight, Jan 1, 1970,
|
|
* we must add 2208988800 seconds to this figure to make up for
|
|
* some seventy years Bell Labs was asleep.
|
|
*/
|
|
|
|
static uint32_t
|
|
machtime(void)
|
|
{
|
|
|
|
#define OFFSET ((uint32_t)25567 * 24*60*60)
|
|
return (htonl((uint32_t)(time(NULL) + OFFSET)));
|
|
#undef OFFSET
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
machtime_dg(int s, struct servtab *sep)
|
|
{
|
|
uint32_t result;
|
|
struct sockaddr_storage ss;
|
|
socklen_t size;
|
|
|
|
size = sizeof(ss);
|
|
if (recvfrom(s, (char *)&result, sizeof(result), 0,
|
|
(struct sockaddr *)&ss, &size) < 0)
|
|
return;
|
|
|
|
if (check_loop((struct sockaddr *)&ss, sep))
|
|
return;
|
|
|
|
result = machtime();
|
|
(void) sendto(s, (char *) &result, sizeof(result), 0,
|
|
(struct sockaddr *)&ss, size);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
machtime_stream(int s, struct servtab *sep __unused)
|
|
{
|
|
uint32_t result;
|
|
|
|
result = machtime();
|
|
(void) send(s, (char *) &result, sizeof(result), MSG_EOF);
|
|
}
|
|
|
|
/*
|
|
* RFC1078 TCP Port Service Multiplexer (TCPMUX). Service connections to
|
|
* services based on the service name sent.
|
|
*
|
|
* Based on TCPMUX.C by Mark K. Lottor November 1988
|
|
* sri-nic::ps:<mkl>tcpmux.c
|
|
*/
|
|
|
|
#define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */
|
|
#define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1)
|
|
|
|
static int /* # of characters up to \r,\n or \0 */
|
|
get_line(int fd, char *buf, int len)
|
|
{
|
|
int count = 0, n;
|
|
struct sigaction sa;
|
|
|
|
sa.sa_flags = 0;
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_handler = SIG_DFL;
|
|
sigaction(SIGALRM, &sa, (struct sigaction *)0);
|
|
do {
|
|
alarm(10);
|
|
n = read(fd, buf, len-count);
|
|
alarm(0);
|
|
if (n == 0)
|
|
return (count);
|
|
if (n < 0)
|
|
return (-1);
|
|
while (--n >= 0) {
|
|
if (*buf == '\r' || *buf == '\n' || *buf == '\0')
|
|
return (count);
|
|
count++;
|
|
buf++;
|
|
}
|
|
} while (count < len);
|
|
return (count);
|
|
}
|
|
|
|
struct servtab *
|
|
tcpmux(int s)
|
|
{
|
|
struct servtab *sep;
|
|
char service[MAX_SERV_LEN+1];
|
|
int len;
|
|
|
|
/* Get requested service name */
|
|
if ((len = get_line(s, service, MAX_SERV_LEN)) < 0) {
|
|
strwrite(s, "-Error reading service name\r\n");
|
|
return (NULL);
|
|
}
|
|
service[len] = '\0';
|
|
|
|
if (debug)
|
|
warnx("tcpmux: someone wants %s", service);
|
|
|
|
/*
|
|
* Help is a required command, and lists available services,
|
|
* one per line.
|
|
*/
|
|
if (!strcasecmp(service, "help")) {
|
|
for (sep = servtab; sep; sep = sep->se_next) {
|
|
if (!ISMUX(sep))
|
|
continue;
|
|
(void)write(s,sep->se_service,strlen(sep->se_service));
|
|
strwrite(s, "\r\n");
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/* Try matching a service in inetd.conf with the request */
|
|
for (sep = servtab; sep; sep = sep->se_next) {
|
|
if (!ISMUX(sep))
|
|
continue;
|
|
if (!strcasecmp(service, sep->se_service)) {
|
|
if (ISMUXPLUS(sep)) {
|
|
strwrite(s, "+Go\r\n");
|
|
}
|
|
return (sep);
|
|
}
|
|
}
|
|
strwrite(s, "-Service not available\r\n");
|
|
return (NULL);
|
|
}
|