ecore_con_client_example.c

Shows how to write a simple client (dialer that connects to the example server using ecore_con_server_connect().

//Compile with:
// gcc -o ecore_con_client_example ecore_con_client_example.c `pkg-config --libs --cflags ecore ecore-con eina`
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <Ecore.h>
#include <Ecore_Con.h>
#include <Ecore_Getopt.h>
/* Ecore_Con client example
* 2010 Mike Blumenkrantz
*/
static Ecore_Con_Server *svr;
static int retval = EXIT_SUCCESS;
static Eina_Bool do_flush = EINA_FALSE;
static Eina_Bool single_message = EINA_FALSE;
static Eina_Bool verify = EINA_TRUE;
static Eina_Bool hostname_verify = EINA_TRUE;
static Eina_Bool do_ssl_upgrade = EINA_FALSE;
static char *starttls_local_command = NULL;
static Eina_Bool
_setup_ssl(void)
{
const char *ca;
if (!(it = eina_file_ls("/etc/ssl/certs")))
{
retval = EXIT_FAILURE;
return EINA_FALSE;
}
/* add all the CAs */
{
fprintf(stderr, "WARNING: could not load CA: %s!\n", ca);
}
if (verify)
if (hostname_verify)
return EINA_TRUE;
}
static Eina_Bool
_on_stdin(void *data EINA_UNUSED, Ecore_Fd_Handler *fdh EINA_UNUSED)
{
char *line = NULL;
#ifdef _WIN32
char lbuf[4096] = "";
ssize_t r;
if (fgets(lbuf, sizeof(lbuf), stdin) == NULL)
r = -1;
else
{
line = strdup(lbuf);
r = strlen(line);
}
#else
size_t len = 0;
ssize_t r = getline(&line, &len, stdin);
#endif
if (r < 0)
{
fprintf(stderr, "ERROR: could not read from stdin: %s\n", strerror(errno));
}
if (!svr)
fputs("WARNING: not connected to server, ignored input.\n", stderr);
else
{
size_t clen = strlen(starttls_local_command);
if (do_ssl_upgrade && ((size_t)r > clen) &&
(strncmp(line, starttls_local_command, clen) == 0) &&
(line[clen] == '\n' || line[clen] == '\r'))
{
printf("INFO: starting SSL communication...\n");
if (!ecore_con_ssl_server_upgrade(svr, ECORE_CON_USE_MIXED | ECORE_CON_LOAD_CERT))
{
printf("ERROR: failed to upgrade to SSL!\n");
retval = EXIT_FAILURE;
}
#if 1
/* This just works since EFL v 1.19. Prior to this,
* upgrade couldn't get any extra setup, such as
* certificate or verification mode as OpenSSL would
* complain.
*/
else if (!_setup_ssl())
{
retval = EXIT_FAILURE;
}
#endif
svr = NULL; /* it's considered dead until ECORE_CON_EVENT_SERVER_UPGRADE */
goto end;
}
ecore_con_server_send(svr, line, r);
printf("INFO: sent %zd bytes to server.\n", r);
if (do_flush) ecore_con_server_flush(svr);
if (single_message)
{
svr = NULL;
}
}
end:
free(line);
}
_add(void *data EINA_UNUSED, int type EINA_UNUSED, Ecore_Con_Event_Server_Add *ev)
{
printf("Server with ip %s connected!\n", ecore_con_server_ip_get(ev->server));
if (do_ssl_upgrade)
printf("INFO: Not sending 'hello!' in tcp+ssl mode. Use: %s to upgrade the connection\n", starttls_local_command);
else
ecore_con_server_send(ev->server, "hello!", strlen("hello!"));
if (do_flush) ecore_con_server_flush(ev->server);
}
_del(void *data EINA_UNUSED, int type EINA_UNUSED, Ecore_Con_Event_Server_Del *ev)
{
printf("Lost server with ip %s!\n", ecore_con_server_ip_get(ev->server));
svr = NULL;
}
_data(void *data EINA_UNUSED, int type EINA_UNUSED, Ecore_Con_Event_Server_Data *ev)
{
printf("Received %i bytes from server:\n"
">>>>>\n"
"%.*s\n"
">>>>>\n",
ev->size,
ev->size, (const char *)ev->data);
}
_write_(void *data EINA_UNUSED, int type EINA_UNUSED, Ecore_Con_Event_Server_Write *ev)
{
printf("Sent %d bytes to server\n", ev->size);
}
_error(void *data EINA_UNUSED, int type EINA_UNUSED, Ecore_Con_Event_Server_Error *ev)
{
printf("Server Error: %s\n", ev->error);
}
_upgrade(void *data EINA_UNUSED, int type EINA_UNUSED, Ecore_Con_Event_Server_Upgrade *ev)
{
printf("Server upgraded to SSL %p %s\n", ev->server, ecore_con_server_ip_get(ev->server));
svr = ev->server;
}
static const char *types_strs[] = {
"tcp",
"udp",
"ssl",
"tcp+ssl",
"local-user",
"local-system",
NULL
};
static const Ecore_Getopt options = {
"ecore_con_client_example", /* program name */
NULL, /* usage line */
"1", /* version */
"(C) 2016 Enlightenment Project; 2010 Mike Blumenkrantz", /* copyright */
"BSD 2-Clause", /* license */
/* long description, may be multiline and contain \n */
"Example of ecore_con_server_connect()\n",
{
ECORE_GETOPT_CHOICE('t', "type", "Server type to use, defaults to 'tcp'", types_strs),
ECORE_GETOPT_STORE_TRUE('P', "no-proxy", "Do not use SOCKS proxy for remote connections."),
ECORE_GETOPT_STORE_TRUE('f', "flush", "Force a flush after every send call."),
ECORE_GETOPT_STORE_TRUE('m', "single-message", "Send a single message and delete the server."),
ECORE_GETOPT_STORE_STR('c', "starttls-local-command", "The string to use as a local command (it's NOT sent to remote peer) to upgrade connections when -t/--type=tcp+ssl. Defaults to STARTTLS, however if you need to send that to the server, change the string with this option."),
ECORE_GETOPT_STORE_FALSE(0, "no-verify", "Do not verify server's certificate"),
ECORE_GETOPT_STORE_FALSE(0, "no-hostname-verify", "Do not Verify server's hostname based on its certificate."),
ECORE_GETOPT_VERSION('V', "version"),
ECORE_GETOPT_COPYRIGHT('C', "copyright"),
ECORE_GETOPT_LICENSE('L', "license"),
ECORE_GETOPT_HELP('h', "help"),
ECORE_GETOPT_STORE_METAVAR_STR(0, NULL, "The server name.", "name"),
ECORE_GETOPT_STORE_METAVAR_INT(0, NULL, "The server port.", "port"),
}
};
int
main(int argc, char *argv[])
{
char *name = NULL;
char *type_choice = NULL;
Ecore_Con_Type type;
int port = -1;
Eina_Bool no_proxy = EINA_FALSE;
Eina_Bool quit_option = EINA_FALSE;
Ecore_Getopt_Value values[] = {
ECORE_GETOPT_VALUE_STR(type_choice),
ECORE_GETOPT_VALUE_BOOL(single_message),
ECORE_GETOPT_VALUE_STR(starttls_local_command),
ECORE_GETOPT_VALUE_BOOL(hostname_verify),
/* standard block to provide version, copyright, license and help */
ECORE_GETOPT_VALUE_BOOL(quit_option), /* -V/--version quits */
ECORE_GETOPT_VALUE_BOOL(quit_option), /* -C/--copyright quits */
ECORE_GETOPT_VALUE_BOOL(quit_option), /* -L/--license quits */
ECORE_GETOPT_VALUE_BOOL(quit_option), /* -h/--help quits */
/* positional argument */
ECORE_GETOPT_VALUE_NONE /* sentinel */
};
int args;
args = ecore_getopt_parse(&options, values, argc, argv);
if (args < 0)
{
fputs("ERROR: Could not parse command line options.\n", stderr);
retval = EXIT_FAILURE;
goto end;
}
if (quit_option) goto end;
args = ecore_getopt_parse_positional(&options, values, argc, argv, args);
if (args < 0)
{
fputs("ERROR: Could not parse positional arguments.\n", stderr);
retval = EXIT_FAILURE;
goto end;
}
if (!type_choice) type_choice = "tcp";
if (strcmp(type_choice, "tcp") == 0)
type = ECORE_CON_REMOTE_TCP;
else if (strcmp(type_choice, "udp") == 0)
type = ECORE_CON_REMOTE_UDP;
else if (strcmp(type_choice, "ssl") == 0)
type = ECORE_CON_REMOTE_TCP | ECORE_CON_USE_MIXED | ECORE_CON_LOAD_CERT;
else if (strcmp(type_choice, "tcp+ssl") == 0)
{
type = ECORE_CON_REMOTE_TCP;
do_ssl_upgrade = EINA_TRUE;
}
else if (strcmp(type_choice, "local-user") == 0)
type = ECORE_CON_LOCAL_USER;
else if (strcmp(type_choice, "local-system") == 0)
type = ECORE_CON_LOCAL_SYSTEM;
else
{
fprintf(stderr, "ERROR: unsupported --type/-t '%s'\n", type_choice);
retval = EXIT_FAILURE;
goto end;
}
if ((!starttls_local_command) || (starttls_local_command[0] == '\0'))
starttls_local_command = "STARTTLS";
if (no_proxy) type |= ECORE_CON_NO_PROXY;
svr = ecore_con_server_connect(type, name, port, NULL);
if (!svr) goto end;
if (strcmp(type_choice, "ssl") == 0)
{
if (!_setup_ssl())
goto no_mainloop;
}
/* set event handler for server connect */
/* set event handler for server disconnect */
/* set event handler for receiving server data */
/* set event handler that notifies of sent data */
/* set event handler that notifies of errors */
/* set event handler that notifies of upgrades */
ecore_main_fd_handler_add(STDIN_FILENO, ECORE_FD_READ, _on_stdin, NULL, NULL, NULL);
/* start client */
no_mainloop:
if (svr)
{
svr = NULL;
}
end:
return retval;
}