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-rw-r--r--usr.sbin/ppp/server.c422
1 files changed, 422 insertions, 0 deletions
diff --git a/usr.sbin/ppp/server.c b/usr.sbin/ppp/server.c
new file mode 100644
index 000000000000..e7936f4ef88c
--- /dev/null
+++ b/usr.sbin/ppp/server.c
@@ -0,0 +1,422 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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/param.h>
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <sys/un.h>
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <termios.h>
+#include <unistd.h>
+
+#include "log.h"
+#include "descriptor.h"
+#include "server.h"
+#include "prompt.h"
+#include "ncpaddr.h"
+#include "probe.h"
+
+static int
+server_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
+{
+ struct server *s = descriptor2server(d);
+ struct prompt *p;
+ int sets;
+
+ sets = 0;
+ if (r && s->fd >= 0) {
+ if (*n < s->fd + 1)
+ *n = s->fd + 1;
+ FD_SET(s->fd, r);
+ log_Printf(LogTIMER, "server: fdset(r) %d\n", s->fd);
+ sets++;
+ }
+
+ for (p = log_PromptList(); p; p = p->next)
+ sets += descriptor_UpdateSet(&p->desc, r, w, e, n);
+
+ return sets;
+}
+
+static int
+server_IsSet(struct fdescriptor *d, const fd_set *fdset)
+{
+ struct server *s = descriptor2server(d);
+ struct prompt *p;
+
+ if (s->fd >= 0 && FD_ISSET(s->fd, fdset))
+ return 1;
+
+ for (p = log_PromptList(); p; p = p->next)
+ if (descriptor_IsSet(&p->desc, fdset))
+ return 1;
+
+ return 0;
+}
+
+static void
+server_Read(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset)
+{
+ struct server *s = descriptor2server(d);
+ struct sockaddr_storage ss;
+ struct sockaddr *sa = (struct sockaddr *)&ss;
+ struct sockaddr_in *sin = (struct sockaddr_in *)&ss;
+#ifndef NOINET6
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&ss;
+#endif
+ int ssize = sizeof ss, wfd;
+ struct prompt *p;
+ struct ncpaddr addr;
+
+ if (s->fd >= 0 && FD_ISSET(s->fd, fdset)) {
+ wfd = accept(s->fd, sa, &ssize);
+ if (wfd < 0)
+ log_Printf(LogERROR, "server_Read: accept(): %s\n", strerror(errno));
+ else if (sa->sa_len == 0) {
+ close(wfd);
+ wfd = -1;
+ }
+ } else
+ wfd = -1;
+
+ if (wfd >= 0)
+ switch (sa->sa_family) {
+ case AF_LOCAL:
+ log_Printf(LogPHASE, "Connected to local client.\n");
+ break;
+
+ case AF_INET:
+ ncpaddr_setsa(&addr, sa);
+ if (ntohs(sin->sin_port) < 1024) {
+ log_Printf(LogALERT, "Rejected client connection from %s:%u"
+ "(invalid port number) !\n",
+ ncpaddr_ntoa(&addr), ntohs(sin->sin_port));
+ close(wfd);
+ wfd = -1;
+ break;
+ }
+ log_Printf(LogPHASE, "Connected to client from %s:%u\n",
+ ncpaddr_ntoa(&addr), ntohs(sin->sin_port));
+ break;
+
+#ifndef NOINET6
+ case AF_INET6:
+ ncpaddr_setsa(&addr, sa);
+ if (ntohs(sin6->sin6_port) < 1024) {
+ log_Printf(LogALERT, "Rejected client connection from %s:%u"
+ "(invalid port number) !\n",
+ ncpaddr_ntoa(&addr), ntohs(sin6->sin6_port));
+ close(wfd);
+ wfd = -1;
+ break;
+ }
+ log_Printf(LogPHASE, "Connected to client from %s:%u\n",
+ ncpaddr_ntoa(&addr), ntohs(sin6->sin6_port));
+ break;
+#endif
+
+ default:
+ write(wfd, "Unrecognised access !\n", 22);
+ close(wfd);
+ wfd = -1;
+ break;
+ }
+
+ if (wfd >= 0) {
+ if ((p = prompt_Create(s, bundle, wfd)) == NULL) {
+ write(wfd, "Connection refused.\n", 20);
+ close(wfd);
+ } else {
+ switch (sa->sa_family) {
+ case AF_LOCAL:
+ p->src.type = "local";
+ strncpy(p->src.from, s->cfg.sockname, sizeof p->src.from - 1);
+ p->src.from[sizeof p->src.from - 1] = '\0';
+ break;
+ case AF_INET:
+ p->src.type = "ip";
+ snprintf(p->src.from, sizeof p->src.from, "%s:%u",
+ ncpaddr_ntoa(&addr), ntohs(sin->sin_port));
+ break;
+#ifndef NOINET6
+ case AF_INET6:
+ p->src.type = "ip6";
+ snprintf(p->src.from, sizeof p->src.from, "%s:%u",
+ ncpaddr_ntoa(&addr), ntohs(sin6->sin6_port));
+ break;
+#endif
+ }
+ prompt_TtyCommandMode(p);
+ prompt_Required(p);
+ }
+ }
+
+ log_PromptListChanged = 0;
+ for (p = log_PromptList(); p; p = p->next)
+ if (descriptor_IsSet(&p->desc, fdset)) {
+ descriptor_Read(&p->desc, bundle, fdset);
+ if (log_PromptListChanged)
+ break;
+ }
+}
+
+static int
+server_Write(struct fdescriptor *d __unused, struct bundle *bundle __unused,
+ const fd_set *fdset __unused)
+{
+ /* We never want to write here ! */
+ log_Printf(LogALERT, "server_Write: Internal error: Bad call !\n");
+ return 0;
+}
+
+struct server server = {
+ {
+ SERVER_DESCRIPTOR,
+ server_UpdateSet,
+ server_IsSet,
+ server_Read,
+ server_Write
+ },
+ -1,
+ { "", "", 0, 0 }
+};
+
+enum server_stat
+server_Reopen(struct bundle *bundle)
+{
+ char name[sizeof server.cfg.sockname];
+ struct stat st;
+ u_short port;
+ mode_t mask;
+ enum server_stat ret;
+
+ if (server.cfg.sockname[0] != '\0') {
+ strcpy(name, server.cfg.sockname);
+ mask = server.cfg.mask;
+ server_Close(bundle);
+ if (server.cfg.sockname[0] != '\0' && stat(server.cfg.sockname, &st) == 0)
+ if (!(st.st_mode & S_IFSOCK) || unlink(server.cfg.sockname) != 0)
+ return SERVER_FAILED;
+ ret = server_LocalOpen(bundle, name, mask);
+ } else if (server.cfg.port != 0) {
+ port = server.cfg.port;
+ server_Close(bundle);
+ ret = server_TcpOpen(bundle, port);
+ } else
+ ret = SERVER_UNSET;
+
+ return ret;
+}
+
+enum server_stat
+server_LocalOpen(struct bundle *bundle, const char *name, mode_t mask)
+{
+ struct sockaddr_un ifsun;
+ mode_t oldmask;
+ int s;
+
+ oldmask = (mode_t)-1; /* Silence compiler */
+
+ if (server.cfg.sockname[0] != '\0' && !strcmp(server.cfg.sockname, name))
+ server_Close(bundle);
+
+ memset(&ifsun, '\0', sizeof ifsun);
+ ifsun.sun_len = strlen(name);
+ if (ifsun.sun_len > sizeof ifsun.sun_path - 1) {
+ log_Printf(LogERROR, "Local: %s: Path too long\n", name);
+ return SERVER_INVALID;
+ }
+ ifsun.sun_family = AF_LOCAL;
+ strcpy(ifsun.sun_path, name);
+
+ s = socket(PF_LOCAL, SOCK_STREAM, 0);
+ if (s < 0) {
+ log_Printf(LogERROR, "Local: socket: %s\n", strerror(errno));
+ goto failed;
+ }
+ setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &s, sizeof s);
+ if (mask != (mode_t)-1)
+ oldmask = umask(mask);
+ if (bind(s, (struct sockaddr *)&ifsun, sizeof ifsun) < 0) {
+ if (mask != (mode_t)-1)
+ umask(oldmask);
+ log_Printf(LogWARN, "Local: bind: %s\n", strerror(errno));
+ close(s);
+ goto failed;
+ }
+ if (mask != (mode_t)-1)
+ umask(oldmask);
+ if (listen(s, 5) != 0) {
+ log_Printf(LogERROR, "Local: Unable to listen to socket -"
+ " BUNDLE overload?\n");
+ close(s);
+ unlink(name);
+ goto failed;
+ }
+ server_Close(bundle);
+ server.fd = s;
+ server.cfg.port = 0;
+ strncpy(server.cfg.sockname, ifsun.sun_path, sizeof server.cfg.sockname - 1);
+ server.cfg.sockname[sizeof server.cfg.sockname - 1] = '\0';
+ server.cfg.mask = mask;
+ log_Printf(LogPHASE, "Listening at local socket %s.\n", name);
+
+ return SERVER_OK;
+
+failed:
+ if (server.fd == -1) {
+ server.fd = -1;
+ server.cfg.port = 0;
+ strncpy(server.cfg.sockname, ifsun.sun_path,
+ sizeof server.cfg.sockname - 1);
+ server.cfg.sockname[sizeof server.cfg.sockname - 1] = '\0';
+ server.cfg.mask = mask;
+ }
+ return SERVER_FAILED;
+}
+
+enum server_stat
+server_TcpOpen(struct bundle *bundle, u_short port)
+{
+ struct sockaddr_storage ss;
+ struct sockaddr_in *sin = (struct sockaddr_in *)&ss;
+#ifndef NOINET6
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&ss;
+#endif
+ int s, sz;
+
+ if (server.cfg.port == port)
+ server_Close(bundle);
+
+ if (port == 0)
+ return SERVER_INVALID;
+
+ memset(&ss, '\0', sizeof ss);
+#ifndef NOINET6
+ if (probe.ipv6_available) {
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = htons(port);
+ sin6->sin6_len = (u_int8_t)sizeof ss;
+ sz = sizeof *sin6;
+ s = socket(PF_INET6, SOCK_STREAM, 0);
+ } else
+#endif
+ {
+ sin->sin_family = AF_INET;
+ sin->sin_port = htons(port);
+ sin->sin_len = (u_int8_t)sizeof ss;
+ sin->sin_addr.s_addr = INADDR_ANY;
+ sz = sizeof *sin;
+ s = socket(PF_INET, SOCK_STREAM, 0);
+ }
+
+ if (s < 0) {
+ log_Printf(LogERROR, "Tcp: socket: %s\n", strerror(errno));
+ goto failed;
+ }
+
+#ifndef NOINET6
+ if (probe.ipv6_available) {
+ int off = 0;
+ setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&off, sizeof(off));
+ }
+#endif
+
+ setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &s, sizeof s);
+ if (bind(s, (struct sockaddr *)&ss, sz) < 0) {
+ log_Printf(LogWARN, "Tcp: bind: %s\n", strerror(errno));
+ close(s);
+ goto failed;
+ }
+ if (listen(s, 5) != 0) {
+ log_Printf(LogERROR, "Tcp: Unable to listen to socket: %s\n",
+ strerror(errno));
+ close(s);
+ goto failed;
+ }
+ server_Close(bundle);
+ server.fd = s;
+ server.cfg.port = port;
+ *server.cfg.sockname = '\0';
+ server.cfg.mask = 0;
+ log_Printf(LogPHASE, "Listening at port %d.\n", port);
+ return SERVER_OK;
+
+failed:
+ if (server.fd == -1) {
+ server.fd = -1;
+ server.cfg.port = port;
+ *server.cfg.sockname = '\0';
+ server.cfg.mask = 0;
+ }
+ return SERVER_FAILED;
+}
+
+int
+server_Close(struct bundle *bundle __unused)
+{
+ if (server.fd >= 0) {
+ if (*server.cfg.sockname != '\0') {
+ struct sockaddr_un un;
+ int sz = sizeof un;
+
+ if (getsockname(server.fd, (struct sockaddr *)&un, &sz) == 0 &&
+ un.sun_family == AF_LOCAL && sz == sizeof un)
+ unlink(un.sun_path);
+ }
+ close(server.fd);
+ server.fd = -1;
+ /* Drop associated prompts */
+ log_DestroyPrompts(&server);
+
+ return 1;
+ }
+
+ return 0;
+}
+
+int
+server_Clear(struct bundle *bundle)
+{
+ int ret;
+
+ ret = server_Close(bundle);
+
+ server.fd = -1;
+ server.cfg.port = 0;
+ *server.cfg.sockname = '\0';
+ server.cfg.mask = 0;
+
+ return ret;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-31 13:24:43 +0000