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#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/epoll.h>
#include <pthread.h>
#include <assert.h>
#include "server.h"
#include "socket.h"
#include "log.h"
typedef struct client_thread_args {
pthread_t self;
psocket client_psock;
char host_buf[NI_MAXHOST], service_buf[NI_MAXSERV];
const server_ctx *server_ctx;
} client_thread_args;
static int server_accept_client(const server_ctx ctx[],
size_t siz, struct epoll_event *event);
static void *
client_mainloop_epoll(void *arg);
server_ctx *
server_init_ctx(server_ctx *ctx, init_cb init_fn)
{
if (!ctx)
ctx = (server_ctx *) malloc(sizeof(*ctx));
assert(ctx);
memset(ctx, 0, sizeof(*ctx));
if (!init_fn(ctx))
return NULL;
return ctx;
}
int server_validate_ctx(const server_ctx *ctx)
{
assert(ctx);
assert(ctx->server_cbs.on_connect && ctx->server_cbs.on_disconnect
&& ctx->server_cbs.mainloop);
assert(ctx->server_cbs.on_free && ctx->server_cbs.on_listen
&& ctx->server_cbs.on_shutdown);
return 0;
}
int server_setup_epoll(server_ctx ctx[], size_t siz)
{
int s, fd = epoll_create1(0); /* flags == 0 -> obsolete size arg is dropped */
struct epoll_event ev;
assert(ctx);
assert(siz > 0 && siz < POTD_MAXFD);
if (fd < 0)
return -1;
for (size_t i = 0; i < siz; ++i) {
memset(&ev, 0, sizeof(ev));
ev.data.fd = ctx[i].sock.fd;
ev.events = EPOLLIN | EPOLLET;
s = socket_addrtostr_in(&ctx[i].sock,
ctx[i].host_buf, ctx[i].service_buf);
if (s) {
E_GAIERR(s, "Convert socket address to string");
return -2;
}
N("Redirector service listening on %s:%s",
ctx[i].host_buf, ctx[i].service_buf);
s = epoll_ctl(fd, EPOLL_CTL_ADD, ctx[i].sock.fd, &ev);
if (s) {
close(fd);
return -3;
}
}
return fd;
}
int server_mainloop_epoll(int epoll_fd, const server_ctx ctx[], size_t siz)
{
static struct epoll_event *events = NULL;
if (!events)
events = (struct epoll_event *) calloc(POTD_MAXEVENTS, sizeof(*events));
assert(events);
assert(ctx);
assert(siz > 0 && siz < POTD_MAXFD);
while (1) {
int n, i;
n = epoll_wait(epoll_fd, events, POTD_MAXEVENTS, -1);
if (n < 0)
return 1;
for (i = 0; i < n; ++i) {
if ((events[i].events & EPOLLERR) ||
(events[i].events & EPOLLHUP) ||
(!(events[i].events & EPOLLIN)))
{
E("Epoll for descriptor %d failed", events[i].data.fd);
E_STRERR("epoll_wait");
close(events[i].data.fd);
continue;
} else {
if (server_accept_client(ctx, siz, &events[i])) {
/* new client connection, accept succeeded */
continue;
}
W2("Server accept client failed: [fd: %d , npoll: %d]", events[i].data.fd, n);
}
}
}
free(events);
return 0;
}
static int server_accept_client(const server_ctx ctx[],
size_t siz, struct epoll_event *event)
{
size_t i;
int s;
client_thread_args *args;
for (i = 0; i < siz; ++i) {
if (ctx[i].sock.fd == event->data.fd) {
args = (client_thread_args *) calloc(1, sizeof(client_thread_args));
if (socket_accept_in(&ctx[i].sock, &args->client_psock)) {
E_STRERR("Could not accept client connection");
return 0;
}
args->server_ctx = &ctx[i];
s = socket_addrtostr_in(&args->client_psock,
args->host_buf, args->service_buf);
if (s) {
E_GAIERR(s, "Convert socket address to string");
goto error;
}
N("New connection from %s:%s to %s:%s",
args->host_buf, args->service_buf,
ctx[i].host_buf, ctx[i].service_buf);
if (pthread_create(&args->self, NULL,
client_mainloop_epoll, args))
{
E_STRERR("Thread creation");
goto error;
}
return 1;
error:
close(args->client_psock.fd);
free(args);
return 0;
}
}
return 0;
}
static void *
client_mainloop_epoll(void *arg)
{
client_thread_args *args;
int s, epoll_fd;
struct epoll_event event;
struct epoll_event *events;
assert(arg);
args = (client_thread_args *) arg;
pthread_detach(args->self);
events = (struct epoll_event *) calloc(POTD_MAXEVENTS, sizeof(*events));
assert(events);
epoll_fd = epoll_create1(0);
if (epoll_fd < 0)
goto finish;
event.data.fd = args->client_psock.fd;
event.events = EPOLLIN | EPOLLOUT | EPOLLET;
memset(&event, 0, sizeof(event));
s = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, args->client_psock.fd, &event);
if (s)
goto finish;
finish:
close(epoll_fd);
close(args->client_psock.fd);
free(events);
free(args);
return NULL;
}
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