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Hash :
49d6b4b0
Author :
Date :
2024-07-08T10:10:42
samples: use evutil_socket_t instead and handle 64 bit Windows (#1682) * Use evutil_socket_t instead in http server sample and handle 64 bit Windows * Update http-server.c * consistently using EV_SOCK_FMT for Windows compatibility * code review: fix missing symbol strsignal * Add evutil_strsignal() helper instead of strsignal() macro --------- Co-authored-by: Hernan Martinez <hernan.c.martinez@gmail.com> Co-authored-by: Azat Khuzhin <azat@libevent.org>
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#include <event2/buffer.h>
#include <event2/bufferevent.h>
#include <event2/event.h>
#include <event2/http.h>
#include <event2/ws.h>
#include "../util-internal.h"
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/queue.h>
#include <sys/stat.h>
#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#include <windows.h>
#include <getopt.h>
#include <io.h>
#ifndef stat
#define stat _stat
#endif
#ifndef fstat
#define fstat _fstat
#endif
#ifndef open
#define open _open
#endif
#ifndef close
#define close _close
#endif
#ifndef O_RDONLY
#define O_RDONLY _O_RDONLY
#endif
#else /* !_WIN32 */
#ifdef EVENT__HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef EVENT__HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef EVENT__HAVE_NETINET_IN6_H
#include <netinet/in6.h>
#endif
#include <unistd.h>
#endif /* _WIN32 */
#define log_d(...) fprintf(stderr, __VA_ARGS__)
typedef struct client {
struct evws_connection *evws;
char name[INET6_ADDRSTRLEN];
TAILQ_ENTRY(client) next;
} client_t;
typedef TAILQ_HEAD(clients_s, client) clients_t;
static clients_t clients;
static void
broadcast_msg(char *msg)
{
struct client *client;
TAILQ_FOREACH (client, &clients, next) {
evws_send_text(client->evws, msg);
}
log_d("%s\n", msg);
}
static void
on_msg_cb(struct evws_connection *evws, int type, const unsigned char *data,
size_t len, void *arg)
{
struct client *self = arg;
char buf[4096];
const char *msg = (const char *)data;
snprintf(buf, sizeof(buf), "%.*s", (int)len, msg);
if (len == 5 && memcmp(buf, "/quit", 5) == 0) {
evws_close(evws, WS_CR_NORMAL);
snprintf(buf, sizeof(buf), "'%s' left the chat", self->name);
} else if (len > 6 && strncmp(msg, "/name ", 6) == 0) {
const char *new_name = (const char *)msg + 6;
int name_len = len - 6;
snprintf(buf, sizeof(buf), "'%s' renamed itself to '%.*s'", self->name,
name_len, new_name);
snprintf(
self->name, sizeof(self->name) - 1, "%.*s", name_len, new_name);
} else {
snprintf(buf, sizeof(buf), "[%s] %.*s", self->name, (int)len, msg);
}
broadcast_msg(buf);
}
static void
on_close_cb(struct evws_connection *evws, void *arg)
{
client_t *client = arg;
log_d("'%s' disconnected\n", client->name);
TAILQ_REMOVE(&clients, client, next);
free(arg);
}
static const char *
nice_addr(const char *addr)
{
if (strncmp(addr, "::ffff:", 7) == 0)
addr += 7;
return addr;
}
static void
addr2str(struct sockaddr *sa, char *addr, size_t len)
{
const char *nice;
unsigned short port;
size_t adlen;
if (sa->sa_family == AF_INET) {
struct sockaddr_in *s = (struct sockaddr_in *)sa;
port = ntohs(s->sin_port);
evutil_inet_ntop(AF_INET, &s->sin_addr, addr, len);
} else { // AF_INET6
struct sockaddr_in6 *s = (struct sockaddr_in6 *)sa;
port = ntohs(s->sin6_port);
evutil_inet_ntop(AF_INET6, &s->sin6_addr, addr, len);
nice = nice_addr(addr);
if (nice != addr) {
size_t len = strlen(addr) - (nice - addr);
memmove(addr, nice, len);
addr[len] = 0;
}
}
adlen = strlen(addr);
snprintf(addr + adlen, len - adlen, ":%d", port);
}
static void
on_ws(struct evhttp_request *req, void *arg)
{
struct client *client;
evutil_socket_t fd;
struct sockaddr_storage addr;
socklen_t len;
client = calloc(1, sizeof(*client));
client->evws = evws_new_session(req, on_msg_cb, client, 0);
if (!client->evws) {
free(client);
log_d("Failed to create session\n");
return;
}
fd = bufferevent_getfd(evws_connection_get_bufferevent(client->evws));
len = sizeof(addr);
getpeername(fd, (struct sockaddr *)&addr, &len);
addr2str((struct sockaddr *)&addr, client->name, sizeof(client->name));
log_d("New client joined from %s\n", client->name);
evws_connection_set_closecb(client->evws, on_close_cb, client);
TAILQ_INSERT_TAIL(&clients, client, next);
}
static void
on_html(struct evhttp_request *req, void *arg)
{
int fd = -1;
struct evbuffer *evb;
struct stat st;
evhttp_add_header(
evhttp_request_get_output_headers(req), "Content-Type", "text/html");
if ((fd = open("ws-chat.html", O_RDONLY)) < 0) {
perror("open");
goto err;
}
if (fstat(fd, &st) < 0) {
/* Make sure the length still matches, now that we
* opened the file :/ */
perror("fstat");
goto err;
}
evb = evbuffer_new();
evbuffer_add_file(evb, fd, 0, st.st_size);
evhttp_send_reply(req, HTTP_OK, NULL, evb);
evbuffer_free(evb);
return;
err:
evhttp_send_error(req, HTTP_NOTFOUND, NULL);
if (fd >= 0)
close(fd);
}
static void
signal_cb(evutil_socket_t fd, short event, void *arg)
{
printf("%s signal received. Terminating\n", evutil_strsignal(EV_SOCK_ARG(fd)));
event_base_loopbreak(arg);
}
int
main(int argc, char **argv)
{
struct event_base *base;
struct event *sig_int;
struct evhttp *http_server;
TAILQ_INIT(&clients);
base = event_base_new();
sig_int = evsignal_new(base, SIGINT, signal_cb, base);
if (sig_int == NULL) {
perror("evsignal_new");
goto cleanup;
}
event_add(sig_int, NULL);
http_server = evhttp_new(base);
if (http_server == NULL) {
perror("evhttp_new");
goto cleanup;
}
evhttp_bind_socket_with_handle(http_server, "0.0.0.0", 8080);
evhttp_set_cb(http_server, "/", on_html, NULL);
evhttp_set_cb(http_server, "/ws", on_ws, NULL);
log_d("Server runs\n");
event_base_dispatch(base);
log_d("Active connections: %d\n", evhttp_get_connection_count(http_server));
evhttp_free(http_server);
event_free(sig_int);
event_base_free(base);
libevent_global_shutdown();
return 0;
cleanup:
if (sig_int) {
event_free(sig_int);
}
if (base) {
event_base_free(base);
}
return 1;
}