/* * Dpi for "Hello World". * * This server is an example. Play with it and modify to your taste. * * Copyright 2003-2007 Jorge Arellano Cid * * 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 #include #include #include #include #include #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 title=%s msg=%s alt1=%s alt2=%s alt3=%s alt4=%s alt5=%s", "dialog", "Dillo: Hello", "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" "\n" "\n" "Simple dpi test page (hello.dpi)\n" "

Hello world!

\n

\n"); /* Show the choice received with the dialog */ a_Dpip_dsh_printf(sh, 0, "

\n" "

\n" "Dialog question: Do you want to see the hello page?
\n" "Answer received: %s

\n" "

\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, "

dpip tag received:

\n" "

\n%s

\n" "
(dpip: dpi protocol)

\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, "

date:

\n"); a_Dpip_dsh_write_str(sh, 0, "

\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, "

\n"); if ((ret = pclose(in_stream)) != 0) MSG("popen: [%d]\n", ret); dFree(child_cmd); } a_Dpip_dsh_write_str(sh, 1, "\n"); dFree(cmd); dFree(url); dFree(dpip_tag); /* Finish the SockHandler */ a_Dpip_dsh_close(sh); a_Dpip_dsh_free(sh); return 0; }