The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix
425 lines
11 KiB
C
425 lines
11 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
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* 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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <sys/un.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <termios.h>
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#include <unistd.h>
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#include "log.h"
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#include "descriptor.h"
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#include "server.h"
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#include "prompt.h"
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#include "ncpaddr.h"
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#include "probe.h"
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static int
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server_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
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{
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struct server *s = descriptor2server(d);
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struct prompt *p;
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int sets;
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sets = 0;
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if (r && s->fd >= 0) {
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if (*n < s->fd + 1)
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*n = s->fd + 1;
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FD_SET(s->fd, r);
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log_Printf(LogTIMER, "server: fdset(r) %d\n", s->fd);
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sets++;
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}
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for (p = log_PromptList(); p; p = p->next)
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sets += descriptor_UpdateSet(&p->desc, r, w, e, n);
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return sets;
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}
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static int
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server_IsSet(struct fdescriptor *d, const fd_set *fdset)
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{
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struct server *s = descriptor2server(d);
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struct prompt *p;
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if (s->fd >= 0 && FD_ISSET(s->fd, fdset))
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return 1;
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for (p = log_PromptList(); p; p = p->next)
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if (descriptor_IsSet(&p->desc, fdset))
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return 1;
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return 0;
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}
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static void
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server_Read(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset)
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{
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struct server *s = descriptor2server(d);
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struct sockaddr_storage ss;
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struct sockaddr *sa = (struct sockaddr *)&ss;
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struct sockaddr_in *sin = (struct sockaddr_in *)&ss;
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#ifndef NOINET6
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&ss;
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#endif
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int ssize = sizeof ss, wfd;
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struct prompt *p;
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struct ncpaddr addr;
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if (s->fd >= 0 && FD_ISSET(s->fd, fdset)) {
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wfd = accept(s->fd, sa, &ssize);
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if (wfd < 0)
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log_Printf(LogERROR, "server_Read: accept(): %s\n", strerror(errno));
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else if (sa->sa_len == 0) {
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close(wfd);
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wfd = -1;
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}
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} else
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wfd = -1;
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if (wfd >= 0)
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switch (sa->sa_family) {
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case AF_LOCAL:
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log_Printf(LogPHASE, "Connected to local client.\n");
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break;
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case AF_INET:
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ncpaddr_setsa(&addr, sa);
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if (ntohs(sin->sin_port) < 1024) {
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log_Printf(LogALERT, "Rejected client connection from %s:%u"
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"(invalid port number) !\n",
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ncpaddr_ntoa(&addr), ntohs(sin->sin_port));
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close(wfd);
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wfd = -1;
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break;
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}
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log_Printf(LogPHASE, "Connected to client from %s:%u\n",
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ncpaddr_ntoa(&addr), ntohs(sin->sin_port));
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break;
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#ifndef NOINET6
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case AF_INET6:
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ncpaddr_setsa(&addr, sa);
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if (ntohs(sin6->sin6_port) < 1024) {
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log_Printf(LogALERT, "Rejected client connection from %s:%u"
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"(invalid port number) !\n",
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ncpaddr_ntoa(&addr), ntohs(sin6->sin6_port));
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close(wfd);
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wfd = -1;
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break;
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}
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log_Printf(LogPHASE, "Connected to client from %s:%u\n",
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ncpaddr_ntoa(&addr), ntohs(sin6->sin6_port));
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break;
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#endif
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default:
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write(wfd, "Unrecognised access !\n", 22);
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close(wfd);
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wfd = -1;
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break;
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}
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if (wfd >= 0) {
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if ((p = prompt_Create(s, bundle, wfd)) == NULL) {
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write(wfd, "Connection refused.\n", 20);
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close(wfd);
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} else {
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switch (sa->sa_family) {
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case AF_LOCAL:
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p->src.type = "local";
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strncpy(p->src.from, s->cfg.sockname, sizeof p->src.from - 1);
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p->src.from[sizeof p->src.from - 1] = '\0';
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break;
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case AF_INET:
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p->src.type = "ip";
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snprintf(p->src.from, sizeof p->src.from, "%s:%u",
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ncpaddr_ntoa(&addr), ntohs(sin->sin_port));
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break;
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#ifndef NOINET6
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case AF_INET6:
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p->src.type = "ip6";
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snprintf(p->src.from, sizeof p->src.from, "%s:%u",
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ncpaddr_ntoa(&addr), ntohs(sin6->sin6_port));
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break;
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#endif
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}
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prompt_TtyCommandMode(p);
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prompt_Required(p);
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}
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}
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log_PromptListChanged = 0;
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for (p = log_PromptList(); p; p = p->next)
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if (descriptor_IsSet(&p->desc, fdset)) {
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descriptor_Read(&p->desc, bundle, fdset);
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if (log_PromptListChanged)
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break;
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}
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}
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static int
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server_Write(struct fdescriptor *d __unused, struct bundle *bundle __unused,
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const fd_set *fdset __unused)
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{
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/* We never want to write here ! */
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log_Printf(LogALERT, "server_Write: Internal error: Bad call !\n");
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return 0;
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}
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struct server server = {
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{
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SERVER_DESCRIPTOR,
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server_UpdateSet,
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server_IsSet,
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server_Read,
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server_Write
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},
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-1,
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{ "", "", 0, 0 }
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};
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enum server_stat
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server_Reopen(struct bundle *bundle)
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{
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char name[sizeof server.cfg.sockname];
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struct stat st;
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u_short port;
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mode_t mask;
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enum server_stat ret;
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if (server.cfg.sockname[0] != '\0') {
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strcpy(name, server.cfg.sockname);
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mask = server.cfg.mask;
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server_Close(bundle);
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if (server.cfg.sockname[0] != '\0' && stat(server.cfg.sockname, &st) == 0)
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if (!(st.st_mode & S_IFSOCK) || unlink(server.cfg.sockname) != 0)
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return SERVER_FAILED;
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ret = server_LocalOpen(bundle, name, mask);
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} else if (server.cfg.port != 0) {
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port = server.cfg.port;
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server_Close(bundle);
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ret = server_TcpOpen(bundle, port);
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} else
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ret = SERVER_UNSET;
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return ret;
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}
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enum server_stat
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server_LocalOpen(struct bundle *bundle, const char *name, mode_t mask)
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{
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struct sockaddr_un ifsun;
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mode_t oldmask;
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int s;
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oldmask = (mode_t)-1; /* Silence compiler */
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if (server.cfg.sockname[0] != '\0' && !strcmp(server.cfg.sockname, name))
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server_Close(bundle);
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memset(&ifsun, '\0', sizeof ifsun);
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ifsun.sun_len = strlen(name);
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if (ifsun.sun_len > sizeof ifsun.sun_path - 1) {
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log_Printf(LogERROR, "Local: %s: Path too long\n", name);
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return SERVER_INVALID;
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}
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ifsun.sun_family = AF_LOCAL;
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strcpy(ifsun.sun_path, name);
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s = socket(PF_LOCAL, SOCK_STREAM, 0);
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if (s < 0) {
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log_Printf(LogERROR, "Local: socket: %s\n", strerror(errno));
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goto failed;
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}
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setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &s, sizeof s);
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if (mask != (mode_t)-1)
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oldmask = umask(mask);
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if (bind(s, (struct sockaddr *)&ifsun, sizeof ifsun) < 0) {
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if (mask != (mode_t)-1)
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umask(oldmask);
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log_Printf(LogWARN, "Local: bind: %s\n", strerror(errno));
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close(s);
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goto failed;
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}
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if (mask != (mode_t)-1)
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umask(oldmask);
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if (listen(s, 5) != 0) {
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log_Printf(LogERROR, "Local: Unable to listen to socket -"
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" BUNDLE overload?\n");
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close(s);
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unlink(name);
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goto failed;
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}
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server_Close(bundle);
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server.fd = s;
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server.cfg.port = 0;
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strncpy(server.cfg.sockname, ifsun.sun_path, sizeof server.cfg.sockname - 1);
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server.cfg.sockname[sizeof server.cfg.sockname - 1] = '\0';
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server.cfg.mask = mask;
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log_Printf(LogPHASE, "Listening at local socket %s.\n", name);
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return SERVER_OK;
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failed:
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if (server.fd == -1) {
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server.fd = -1;
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server.cfg.port = 0;
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strncpy(server.cfg.sockname, ifsun.sun_path,
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sizeof server.cfg.sockname - 1);
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server.cfg.sockname[sizeof server.cfg.sockname - 1] = '\0';
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server.cfg.mask = mask;
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}
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return SERVER_FAILED;
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}
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enum server_stat
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server_TcpOpen(struct bundle *bundle, u_short port)
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{
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struct sockaddr_storage ss;
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struct sockaddr_in *sin = (struct sockaddr_in *)&ss;
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#ifndef NOINET6
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&ss;
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#endif
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int s, sz;
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if (server.cfg.port == port)
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server_Close(bundle);
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if (port == 0)
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return SERVER_INVALID;
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memset(&ss, '\0', sizeof ss);
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#ifndef NOINET6
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if (probe.ipv6_available) {
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sin6->sin6_family = AF_INET6;
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sin6->sin6_port = htons(port);
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sin6->sin6_len = (u_int8_t)sizeof ss;
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sz = sizeof *sin6;
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s = socket(PF_INET6, SOCK_STREAM, 0);
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} else
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#endif
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{
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sin->sin_family = AF_INET;
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sin->sin_port = htons(port);
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sin->sin_len = (u_int8_t)sizeof ss;
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sin->sin_addr.s_addr = INADDR_ANY;
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sz = sizeof *sin;
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s = socket(PF_INET, SOCK_STREAM, 0);
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}
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if (s < 0) {
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log_Printf(LogERROR, "Tcp: socket: %s\n", strerror(errno));
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goto failed;
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}
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#ifndef NOINET6
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if (probe.ipv6_available) {
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int off = 0;
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setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&off, sizeof(off));
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}
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#endif
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setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &s, sizeof s);
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if (bind(s, (struct sockaddr *)&ss, sz) < 0) {
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log_Printf(LogWARN, "Tcp: bind: %s\n", strerror(errno));
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close(s);
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goto failed;
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}
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if (listen(s, 5) != 0) {
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log_Printf(LogERROR, "Tcp: Unable to listen to socket: %s\n",
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strerror(errno));
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close(s);
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goto failed;
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}
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server_Close(bundle);
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server.fd = s;
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server.cfg.port = port;
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*server.cfg.sockname = '\0';
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server.cfg.mask = 0;
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log_Printf(LogPHASE, "Listening at port %d.\n", port);
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return SERVER_OK;
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failed:
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if (server.fd == -1) {
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server.fd = -1;
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server.cfg.port = port;
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*server.cfg.sockname = '\0';
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server.cfg.mask = 0;
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}
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return SERVER_FAILED;
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}
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int
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server_Close(struct bundle *bundle __unused)
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{
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if (server.fd >= 0) {
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if (*server.cfg.sockname != '\0') {
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struct sockaddr_un un;
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int sz = sizeof un;
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if (getsockname(server.fd, (struct sockaddr *)&un, &sz) == 0 &&
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un.sun_family == AF_LOCAL && sz == sizeof un)
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unlink(un.sun_path);
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}
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close(server.fd);
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server.fd = -1;
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/* Drop associated prompts */
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log_DestroyPrompts(&server);
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return 1;
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}
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return 0;
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}
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int
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server_Clear(struct bundle *bundle)
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{
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int ret;
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ret = server_Close(bundle);
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server.fd = -1;
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server.cfg.port = 0;
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*server.cfg.sockname = '\0';
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server.cfg.mask = 0;
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return ret;
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}
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