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libipc-old/examples/simple-tcpd.c

302 lines
6.7 KiB
C

#include "../src/ipc.h"
// #include "../src/log.h"
#include "../src/utils.h"
#include <signal.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/un.h>
#include <unistd.h>
#define CLOG_DEBUG(a, ...) LOG_DEBUG (""); LOG_DEBUG("\033[36m" a "\033[00m", #__VA_ARGS__); LOG_DEBUG ("")
void chomp (char *str, size_t len)
{
if (str[len - 1] == '\n') {
str[len - 1] = '\0';
}
if (str[len - 2] == '\n') {
str[len - 2] = '\0';
}
}
/*
*
* TODO:
* This program is under heavy developement.
* Still many things to do.
* NOT READY FOR PRODUCTION.
*
Server side:
1. sock_tcp = tcp socket
2. ipc_server_init
3. ipc_add (ipc_server, sock_tcp)
4. wait_event
if reading on extra socket
if reading on sock_tcp
sock_client = accept
ipc_add_fd sock_client
elif
if socket bind to another (client to service or service to client)
reading on fd ; writing on related fd
else
connection from the client:
1. client sends service name
2. ipcd establishes a connection to the service
3. ack
else
lolwat shouldn't happen :(
elif reading on usual socket
do something
**/
#define SERVICE_NAME "simpletcp"
struct ipc_ctx *ctx = NULL;
void handle_disconnection (int fd)
{
int delfd;
delfd = ipc_switching_del (&ctx->switchdb, fd);
if (delfd >= 0) {
close (delfd);
ipc_del_fd (ctx, delfd);
}
close (fd);
ipc_del_fd (ctx, fd);
// printf ("ctx.switchdb\n");
ipc_switching_print (&ctx->switchdb);
}
void tcp_connection (int fd)
{
SECURE_BUFFER_DECLARATION (char, buf, BUFSIZ);
ssize_t len = recv (fd, buf, BUFSIZ, 0);
if (len <= 0) {
handle_disconnection (fd);
return;
}
buf[len] = '\0';
// XXX: for testing purposes
chomp (buf, len);
// TODO: tests
T_PERROR_Q ((send (fd, "OK", 2, 0) <= 0), "sending a message", EXIT_FAILURE);
printf ("connection to %s\n", buf);
struct ipc_error ret = ipc_connection_switched (ctx, buf);
if (ret.error_code != IPC_ERROR_NONE) {
fprintf (stderr, "%s\n", ret.error_message);
exit (EXIT_FAILURE);
}
ipc_switching_add (&ctx->switchdb, fd, ctx->pollfd[ctx->size-1].fd);
ipc_ctx_fd_type (ctx, fd, IPC_CONNECTION_TYPE_SWITCHED);
}
int accept_new_client (int serverfd)
{
SECURE_DECLARATION (struct sockaddr_in, client);
socklen_t addrlen = 0;
int sock_fd_client;
T_PERROR_Q (((sock_fd_client =
accept (serverfd, (struct sockaddr *)&client, &addrlen)) == -1), "accept new client",
EXIT_FAILURE);
// adding a client, for now not switched:
// tcpd should handle the first message (getting the service name)
ipc_add_fd (ctx, sock_fd_client);
return sock_fd_client;
}
void main_loop (int argc, char **argv)
{
argc = argc; // FIXME: useless
int serverfd;
SECURE_DECLARATION (struct sockaddr_in, my_addr);
socklen_t addrlen;
// socket factory
if ((serverfd = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
perror ("socket");
return;
}
int yes = 1;
if (setsockopt (serverfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof (int)) == -1) {
perror ("setsockopt");
return;
}
// init local addr structure and other params
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons (atoi (argv[1]));
my_addr.sin_addr.s_addr = INADDR_ANY;
addrlen = sizeof (struct sockaddr_in);
// bind addr structure with socket
if (bind (serverfd, (struct sockaddr *)&my_addr, addrlen) == -1) {
perror ("bind");
return;
}
// set the socket in passive mode (only used for accept())
// and set the list size for pending connection
if (listen (serverfd, 5) == -1) {
perror ("listen");
return;
}
SECURE_DECLARATION (struct ipc_event, event);
ipc_add_fd (ctx, serverfd);
int cpt = 0;
int timer = 10000;
while (1) {
// ipc_wait_event provides one event at a time
// warning: event->m is free'ed if not NULL
ipc_ctx_print (ctx);
TEST_IPC_WAIT_EVENT_Q (ipc_wait_event (ctx, &event, &timer), EXIT_FAILURE);
switch (event.type) {
case IPC_EVENT_TYPE_TIMER:{
printf ("timed out!\n");
timer = 10000;
}
break;
case IPC_EVENT_TYPE_SWITCH:{
printf ("switch happened, from %d\n", event.origin);
}
break;
case IPC_EVENT_TYPE_EXTRA_SOCKET:
{
// NEW CLIENT
if (event.origin == serverfd) {
int sock_fd_client = accept_new_client (serverfd);
cpt++;
printf ("TCP connection: %d ctx connected\n", cpt);
printf ("new TCP client has the fd %d\n", sock_fd_client);
}
// CLIENT IS TALKING
else {
// Test: if the socket already is in the switch, this means we can just switch the packet.
// Is the socket in the switch db?
tcp_connection (event.origin);
}
}
break;
case IPC_EVENT_TYPE_CONNECTION:
{
cpt++;
printf ("connection: %d ctx connected\n", cpt);
printf ("new client has the fd %d\n", event.origin);
};
break;
case IPC_EVENT_TYPE_DISCONNECTION:
{
cpt--;
printf ("disconnection: %d ctx remaining\n", cpt);
};
break;
case IPC_EVENT_TYPE_MESSAGE:
{
struct ipc_message *m = event.m;
if (m->length > 0) {
printf ("message received (type %d): %.*s\n", m->type, m->length, m->payload);
}
// m->fd = 3;
TEST_IPC_P (ipc_write (ctx, m), "server write");
};
break;
case IPC_EVENT_TYPE_TX:
{
printf ("a message was sent\n");
}
break;
case IPC_EVENT_TYPE_ERROR:
fprintf (stderr, "a problem happened with client %d\n", event.origin);
break;
default:
fprintf (stderr, "there must be a problem, event not set: %d\n", event.type);
exit(1);
}
}
// should never go there
exit (EXIT_FAILURE);
}
void exit_program (int signal)
{
printf ("Quitting, signal: %d\n", signal);
// Close then free remaining ctx.
ipc_close_all (ctx);
ipc_ctx_free (ctx);
// free, free everything!
free (ctx);
exit (EXIT_SUCCESS);
}
/*
* service ping-pong: send back everything sent by the ctx
* stop the program on SIG{TERM,INT,ALRM,USR{1,2},HUP} signals
*/
int main (int argc, char *argv[])
{
// check the number of args on command line
if (argc != 2) {
printf ("USAGE: %s port_num\n", argv[0]);
exit (EXIT_FAILURE);
}
printf ("pid = %d\n", getpid ());
ctx = malloc (sizeof (struct ipc_ctx));
memset(ctx, 0, sizeof (struct ipc_ctx));
struct ipc_error ret = ipc_server_init (ctx, SERVICE_NAME);
if (ret.error_code != IPC_ERROR_NONE) {
fprintf (stderr, "%s\n", ret.error_message);
return EXIT_FAILURE;
}
printf ("Listening on [%s].\n", ctx->cinfos[0].spath);
printf ("MAIN: server created\n");
signal (SIGHUP , exit_program);
signal (SIGALRM , exit_program);
signal (SIGUSR1 , exit_program);
signal (SIGUSR2 , exit_program);
signal (SIGTERM , exit_program);
signal (SIGINT , exit_program);
// the service will loop until the end of time, or a signal
main_loop (argc, argv);
// main_loop should not return
return EXIT_FAILURE;
}