view dpi/hello.c @ 2030:382160be8c2f

cookies comments I was going to say something in the comments about simplicity and not implementing every little bit of the rfc when we don't know of cookies that make it necessary, but then I suppose that's all implied with dillo.
author corvid <corvid@lavabit.com>
date Tue, 17 May 2011 22:48:50 +0000
parents c2fc4d2510d0
children
line wrap: on
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/*
 * Dpi for "Hello World".
 *
 * This server is an example. Play with it and modify to your taste.
 *
 * Copyright 2003-2007 Jorge Arellano Cid <jcid@dillo.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 */

#include <unistd.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "../dpip/dpip.h"
#include "dpiutil.h"

/*
 * Debugging macros
 */
#define _MSG(...)
#define MSG(...)  printf("[hello dpi]: " __VA_ARGS__)

/*---------------------------------------------------------------------------*/


/*
 *
 */
int main(void)
{
   FILE *in_stream;
   Dsh *sh;
   char *dpip_tag, *cmd = NULL, *url = NULL, *child_cmd = NULL;
   char *esc_tag, *d_cmd;
   size_t n;
   int ret;
   char buf[4096];
   char *choice[] = {"Window was closed", "Yes", "No",
                      "Could be", "It's OK", "Cancel"};
                   /* "Could>be", ">It's OK", "Can'>cel"};  --for testing */
   int choice_num = -1;

   MSG("starting...\n");
   /* sleep(20) */

   /* Initialize the SockHandler.
    * This means we'll use stdin for input and stdout for output.
    * In case of a server dpi, we'd use a socket and pass its file descriptor
    * twice (e.g. a_Dpip_dsh_new(sock_fd, sock_fd, 1024).
    * (Note: by now the last parameter is not used) */
   sh = a_Dpip_dsh_new(STDIN_FILENO, STDOUT_FILENO, 2*1024);

   /* Authenticate our client...
    * As we're using Internet domain sockets, DPIP checks whether the client
    * runs with the user's ID, by means of a shared secret. The DPIP API does
    * the work for us. */
   if (!(dpip_tag = a_Dpip_dsh_read_token(sh, 1)) ||
       a_Dpip_check_auth(dpip_tag) < 0) {
      MSG("can't authenticate request: %s\n", dStrerror(errno));
      a_Dpip_dsh_close(sh);
      return 1;
   }
   dFree(dpip_tag);

   /* Read the dpi command from STDIN
    * Now we're past the authentication phase, let's see what's dillo
    * asking from us. a_Dpip_dsh_read_token() will block and return
    * a full dpip token or null on error (it's commented in dpip.c) */
   dpip_tag = a_Dpip_dsh_read_token(sh, 1);
   MSG("tag = [%s]\n", dpip_tag);

   /* Now that we have the dpip_tag, let's isolate the command and url */
   cmd = a_Dpip_get_attr(dpip_tag, "cmd");
   url = a_Dpip_get_attr(dpip_tag, "url");

/*-- Dialog part */
/* This is the dialog window. This is an example of interaction with
 * the user. If you're starting to understand dpis, comment this out
 * by switching to "#if 0" and the dialog will be disabled. */
#if 1
{
   char *dpip_tag2, *dialog_msg;

   /* Let's confirm the request */
   /* NOTE: you can send less alternatives (e.g. only alt1 and alt2) */
   d_cmd = a_Dpip_build_cmd(
              "cmd=%s msg=%s alt1=%s alt2=%s alt3=%s alt4=%s alt5=%s",
              "dialog", "Do you want to see the hello page?",
              choice[1], choice[2], choice[3], choice[4], choice[5]);
   a_Dpip_dsh_write_str(sh, 1, d_cmd);
   dFree(d_cmd);

   /* Get the answer */
   dpip_tag2 = a_Dpip_dsh_read_token(sh, 1);
   MSG("tag = [%s]\n", dpip_tag2);

   /* Get "msg" value */
   dialog_msg = a_Dpip_get_attr(dpip_tag2, "msg");
   choice_num = 0;
   if (dialog_msg)
      choice_num = *dialog_msg - '0';

   dFree(dialog_msg);
   dFree(dpip_tag2);
}
#endif
/*-- EOD part */

   /* Start sending our answer.
    * (You can read the comments for DPIP API functions in dpip/dpip.c) */
   d_cmd = a_Dpip_build_cmd("cmd=%s url=%s", "start_send_page", url);
   a_Dpip_dsh_write_str(sh, 0, d_cmd);
   dFree(d_cmd);

   a_Dpip_dsh_printf(sh, 0,
      "Content-type: text/html\n\n"
      "<!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.01 Transitional//EN'>\n"
      "<html>\n"
      "<head><title>Simple dpi test page (hello.dpi)</title></head>\n"
      "<body><hr><h1>Hello world!</h1><hr>\n<br><br>\n");

   /* Show the choice received with the dialog */
   a_Dpip_dsh_printf(sh, 0,
      "<hr>\n"
      "<table width='100%%' border='1' bgcolor='burlywood'><tr><td>\n"
      "<big><em>Dialog question:</em> Do you want to see the hello page?<br>\n"
      "<em>Answer received:</em> <b>%s</b></big> </table>\n"
      "<hr>\n",
      choice_num < 0 ? "There was NO dialog!" : choice[choice_num]);

   /* Show the dpip tag we received */
   esc_tag = Escape_html_str(dpip_tag);
   a_Dpip_dsh_printf(sh, 0,
      "<h3>dpip tag received:</h3>\n"
      "<pre>\n%s</pre>\n"
      "<br><small>(<b>dpip:</b> dpi protocol)</small><br><br><br>\n",
      esc_tag);
   dFree(esc_tag);


   /* Now something more interesting,
    * fork a command and show its feedback.
    * (An example of generating dynamic content with an external
    *  program). */
   if (cmd && url) {
      child_cmd = dStrdup("date -R");
      MSG("[%s]\n", child_cmd);

      /* Fork, exec command, get its output and answer */
      if ((in_stream = popen(child_cmd, "r")) == NULL) {
         perror("popen");
         return EXIT_FAILURE;
      }

      a_Dpip_dsh_write_str(sh, 0, "<h3>date:</h3>\n");
      a_Dpip_dsh_write_str(sh, 0, "<pre>\n");

      /* Read/Write */
      while ((n = fread (buf, 1, 4096, in_stream)) > 0) {
         a_Dpip_dsh_write(sh, 0, buf, n);
      }

      a_Dpip_dsh_write_str(sh, 0, "</pre>\n");

      if ((ret = pclose(in_stream)) != 0)
         MSG("popen: [%d]\n", ret);

      dFree(child_cmd);
   }

   a_Dpip_dsh_write_str(sh, 1, "</body></html>\n");

   dFree(cmd);
   dFree(url);
   dFree(dpip_tag);

   /* Finish the SockHandler */
   a_Dpip_dsh_close(sh);
   a_Dpip_dsh_free(sh);

   return 0;
}