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 0000000..3997eaf
--- /dev/null
+++ b/usr.sbin/ppp/server.c
@@ -0,0 +1,422 @@
+/*-
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#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;
+}