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#include "server_eh.h"
#include "http_parser.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <stddef.h>
#include <unistd.h>
// utils
static inline int setnonblock(int fd) {
int flags = fcntl(fd, F_GETFL);
if (flags < 0) return flags;
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0) return -1;
return 0;
}
#define REQUEST_BUFFER_SIZE 2048
#define alloc_cpy(dest, src, len) \
dest = (char*)malloc(len + 1);\
memcpy(dest, src, len);\
dest[len] = '\0';
// http_parser callback and settings
int null_cb(http_parser *parser) { return 0; }
static int count = 0;
int url_cb(http_parser *parser, const char *buf, size_t len) {
count++;
struct http_request *request = (struct http_request *) parser->data;
request->method = parser->method;
request->http_major = parser->http_major;
request->http_minor = parser->http_minor;
alloc_cpy(request->url, buf, len)
if (count % 100 == 0) printf("%d\n", count);
return 0;
}
int header_field_cb(http_parser *parser, const char *buf, size_t len) {
struct http_request *request = (struct http_request *) parser->data;
struct http_header *header = add_http_header(request);
alloc_cpy(header->name, buf, len)
return 0;
}
int header_value_cb(http_parser *parser, const char *buf, size_t len) {
struct http_request *request = (struct http_request *) parser->data;
struct http_header *header = request->headers;
while (header->next != NULL) {
header = header->next;
}
alloc_cpy(header->value, buf, len)
return 0;
}
int body_cb(http_parser *parser, const char *buf, size_t len) {
struct http_request *request = (struct http_request *) parser->data;
alloc_cpy(request->body, buf, len)
return 0;
}
static http_parser_settings parser_settings =
{
.on_message_begin = null_cb
,.on_message_complete = null_cb
,.on_headers_complete = null_cb
,.on_header_field = header_field_cb
,.on_header_value = header_value_cb
,.on_url = url_cb
,.on_body = body_cb
};
struct http_request *parse_request(char *request_data, int len) {
http_parser *parser = malloc(sizeof(http_parser));
http_parser_init(parser, HTTP_REQUEST);
struct http_request *request = new_http_request();
parser->data = request;
int res = http_parser_execute(parser, &parser_settings, request_data, len);
if (res == len) {
if (http_should_keep_alive(parser)) {
request->flags |= F_HREQ_KEEPALIVE;
}
free(parser);
return request;
}
delete_http_request(request);
free(parser);
return NULL;
}
// libev callbacks and client structures
struct client {
int fd;
ev_io ev_accept;
ev_io ev_read;
ev_io ev_write;
char *request_data;
struct http_request *request;
void (*handle_request)(struct http_request *request, int fd);
};
static void write_cb(struct ev_loop *loop, struct ev_io *w, int revents) {
if (!(revents & EV_WRITE)) {
ev_io_stop(EV_A_ w);
return;
}
struct client *client =
(struct client *)
(((char *) w) - offsetof(struct client, ev_write));
struct http_request *request = client->request;
if (request == NULL) {
write(client->fd, "HTTP/1.1 400 Bad Request\r\n\r\n", 24);
close(client->fd);
free(client->request_data);
free(client);
ev_io_stop(EV_A_ w);
return;
}
client->handle_request(request, client->fd);
delete_http_request(request);
free(client->request_data);
free(client);
ev_io_stop(EV_A_ w);
}
static void read_cb(struct ev_loop *loop, struct ev_io *w, int revents) {
if (!(revents & EV_READ)) {
ev_io_stop(EV_A_ w);
return;
}
struct client *client =
(struct client *)
(((char *) w) - offsetof(struct client, ev_read));
char *rbuff[REQUEST_BUFFER_SIZE + 1];
int sum = 0, len = 0;
client->request_data = NULL;
do {
len = read(client->fd, &rbuff, REQUEST_BUFFER_SIZE);
sum += len;
if (len < REQUEST_BUFFER_SIZE)
rbuff[len] = '\0';
if (client->request_data == NULL) {
client->request_data = malloc(len+1);
memcpy(client->request_data, rbuff, len);
} else {
client->request_data = realloc(client->request_data, sum + 1);
memcpy(client->request_data + sum - len, rbuff, len);
}
} while (len == REQUEST_BUFFER_SIZE);
client->request = NULL;
client->request = parse_request(client->request_data, len);
ev_io_stop(EV_A_ w);
ev_io_init(&client->ev_write, write_cb, client->fd, EV_WRITE);
ev_io_start(loop, &client->ev_write);
}
static void accept_cb(struct ev_loop *loop, struct ev_io *w, int revents) {
struct client *main_client =
(struct client *)
(((char *) w) - offsetof(struct client, ev_accept));
struct sockaddr_in client_addr;
socklen_t client_len = sizeof(struct sockaddr_in);
int client_fd = accept(w->fd, (struct sockaddr *) &client_addr, &client_len);
if (client_fd == -1) {
return;
}
if (setnonblock(client_fd) < 0) {
perror("failed to set client socket to nonblock");
return;
}
struct client *client = malloc(sizeof(struct client));
client->handle_request = main_client->handle_request;
client->fd = client_fd;
ev_io_init(&client->ev_read, read_cb, client->fd, EV_READ);
ev_io_start(loop, &client->ev_read);
}
int http_server_loop(struct http_server *server) {
server->loop = ev_default_loop(0);
int listen_fd = socket(AF_INET, SOCK_STREAM, 0);
if (listen_fd < 0) {
perror("listen failed(socket)");
return -1;
}
int reuseaddr_on = 1;
if (setsockopt(
listen_fd,
SOL_SOCKET,
SO_REUSEADDR,
&reuseaddr_on,
sizeof(server->listen_addr)) == -1) {
perror("setsockopt failed");
return -1;
}
struct sockaddr *listen_addr = (struct sockaddr *) server->listen_addr;
if (bind(listen_fd, listen_addr, sizeof(*listen_addr)) < 0) {
perror("bind failed");
return -1;
}
if (listen(listen_fd, 5) < 0) {
perror("listen failed(listen)");
return -1;
}
if (setnonblock(listen_fd) < 0) {
perror("failed to set server socket to nonblock");
return -1;
}
struct client *main_client = malloc(sizeof(struct client));
main_client->handle_request = server->handle_request;
ev_io_init(&main_client->ev_accept, accept_cb, listen_fd, EV_READ);
ev_io_start(server->loop, &main_client->ev_accept);
server->ev_accept = &main_client->ev_accept;
ev_loop(server->loop, 0);
return 0;
}
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