Add a PPP daemon. From Max Neklyudov

1 files changed, 136 insertions, 0 deletions

diff --git a/apps/netutils/pppd/chat.c b/apps/netutils/pppd/chat.c
new file mode 100644
index 000000000..9042437dc
--- /dev/null
+++ b/apps/netutils/pppd/chat.c
@@ -0,0 +1,136 @@
+#include "ppp_conf.h"
+#include "ppp_arch.h"
+#include "chat.h"
+
+#include <poll.h>
+
+#define CHAT_MAX_SKIP     8
+#define CHAT_ECHO_TIMEOUT 500
+
+static int chat_read_byte(int fd, char* c, int timeout)
+{
+  int ret;
+  struct pollfd fds;
+
+  fds.fd = fd;
+  fds.events = POLLIN;
+  fds.revents = 0;
+
+  ret = poll(&fds, 1, timeout);
+  if (ret <= 0)
+    {
+      return -1;
+    }
+
+  ret = read(fd, c, 1);
+  if (ret != 1)
+    {
+      return -1;
+    }
+
+  printf("chat: char = %c (0x%02X)\n", *c, *c);
+
+  return 0;
+}
+
+static void chat_flush(int fd)
+{
+  char tmp;
+  while (chat_read_byte(fd, &tmp, 0) == 0);
+}
+
+static int chat_check_response(int fd, const char* response, int timeout)
+{
+  char c;
+  int ret;
+  int skip = CHAT_MAX_SKIP;
+
+  while (*response)
+    {
+      ret = chat_read_byte(fd, &c, timeout);
+      if (ret < 0)
+        {
+          return ret;
+        }
+
+      if (skip > 0 && (c == '\r' || c == '\n')) 
+        {
+          --skip;
+          continue;
+        }
+
+      if (c == *response)
+        {
+          ++response;
+        }
+      else
+        {
+          return -1;
+        }
+    }
+
+  return 0;
+}
+
+int ppp_chat(int fd, struct chat_script_s *script, int echo)
+{
+  int ret;
+  size_t len;
+  struct chat_line_s *line = script->lines;
+  const char* request = line->request;
+  const char* response = line->response;
+
+  while (request)
+    {
+      chat_flush(fd);
+
+      printf("chat: send '%s`\n", request);
+      len = strlen(request);
+      ret = write(fd, request, len);
+      if (ret < 0)
+        {
+          return ret;
+        }
+      else if ((size_t)ret != len)
+        {
+          return -1;
+        }
+
+      ret = write(fd, "\r\n", 2);
+      if (ret != 2)
+        {
+          return -1;
+        }
+
+      /* Check echo if enabled */
+
+      if (echo)
+        {
+          ret = chat_check_response(fd, request, CHAT_ECHO_TIMEOUT);
+          if (ret < 0)
+            {
+              printf("chat: invalid echo\n");
+              return ret;
+            }
+        }
+
+      if (response)
+        {
+          printf("chat: wait for '%s`\n", response);
+          ret = chat_check_response(fd, response, script->timeout * 1000);
+          if (ret < 0)
+            {
+              printf("chat: bad response\n");
+              return ret;
+            }
+
+          printf("chat: got it!\n");
+        }
+
+      ++line;
+      request = line->request;
+      response = line->response;
+    }
+
+  return 0;
+}
\ No newline at end of file