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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;
}
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