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httpserver.h
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1181 lines (1043 loc) · 34.8 KB
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* MIT License
*
* Copyright (c) 2019 Jeremy Williams
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* httpserver.h (0.3.1)
*
* Description:
*
* A single header C library for building non-blocking event driven HTTP
* servers
*
* Usage:
*
* Do this:
* #define HTTPSERVER_IMPL
* before you include this file in *one* C or C++ file to create the
* implementation.
*
* // i.e. it should look like this:
* #include ...
* #include ...
* #include ...
* #define HTTPSERVER_IMPL
* #include "httpserver.h"
*
* For more details see the documentation of the interface and the example
* below.
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#ifndef HTTPSERVER_H
#define HTTPSERVER_H
#ifdef __cplusplus
extern "C" {
#endif
// String type used to read the request details. The char pointer is NOT null
// terminated.
struct http_string_s {
char const * buf;
int len;
};
struct http_server_s;
struct http_request_s;
struct http_response_s;
// Returns the event loop id that the server is running on. This will be an
// epoll fd when running on Linux or a kqueue on BSD. This can be used to
// listen for activity on sockets, etc. The only caveat is that the user data
// must be set to a struct where the first member is the function pointer to
// a callback that will handle the event. i.e:
//
// For kevent:
//
// struct foo {
// void (*handler)(struct kevent*);
// ...
// }
//
// // Set ev.udata to a foo pointer when registering the event.
//
// For epoll:
//
// struct foo {
// void (*handler)(struct epoll_event*);
// ...
// }
//
// // Set ev.data.ptr to a foo pointer when registering the event.
int http_server_loop(struct http_server_s* server);
// Allocates and initializes the http server. Takes a port and a function
// pointer that is called to process requests.
struct http_server_s* http_server_init(int port, void (*handler)(struct http_request_s*));
// Starts the event loop and the server listening. During normal operation this
// function will not return. Return value is the error code if the server fails
// to start.
int http_server_listen(struct http_server_s* server);
// Returns the request method as it was read from the HTTP request line.
struct http_string_s http_request_method(struct http_request_s* request);
// Returns the full request target (url) as it was read from the HTTP request
// line.
struct http_string_s http_request_target(struct http_request_s* request);
// Returns the request body. If no request body was sent buf and len of the
// string will be set to 0.
struct http_string_s http_request_body(struct http_request_s* request);
// Returns the request header value for the given header key. The key is case
// insensitive.
struct http_string_s http_request_header(struct http_request_s* request, char const * key);
// Procedure used to iterate over all the request headers. iter should be
// initialized to zero before calling. Each call will set key and val to the
// key and value of the next header. Returns 0 when there are no more headers.
int http_request_iterate_headers(
struct http_request_s* request,
struct http_string_s* key,
struct http_string_s* val,
int* iter
);
#define HTTP_KEEP_ALIVE 1
#define HTTP_CLOSE 0
// By default the server will inspect the Connection header and the HTTP
// version to determine whether the connection should be kept alive or not.
// Use this function to override that behaviour to force the connection to
// keep-alive or close by passing in the HTTP_KEEP_ALIVE or HTTP_CLOSE
// directives respectively. This may provide a minor performance improvement
// in cases where you control client and server and want to always close or
// keep the connection alive.
void http_request_connection(struct http_request_s* request, int directive);
// When reading in the HTTP request the server allocates a buffer to store
// the request details such as the headers, method, body, etc. By default this
// memory will be freed when http_respond is called. This function lets you
// free that memory before the http_respond call. This can be useful if you
// have requests that take a long time to complete and you don't require the
// request data. Accessing any http_string_s's will be invalid after this call.
void http_request_free_buffer(struct http_request_s* request);
// Allocates an http response. This memory will be freed when http_respond is
// called.
struct http_response_s* http_response_init();
// Set the response status. Accepts values between 100 and 599 inclusive. Any
// other value will map to 500.
void http_response_status(struct http_response_s* response, int status);
// Set a response header. Takes two null terminated strings.
void http_response_header(struct http_response_s* response, char const * key, char const * value);
// Set the response body. The caller is responsible for freeing any memory that
// may have been allocated for the body. It is safe to free this memory AFTER
// http_respond has been called.
void http_response_body(struct http_response_s* response, char const * body, int length);
// Starts writing the response to the client. Any memory allocated for the
// response body or response headers is safe to free after this call.
void http_respond(struct http_request_s* request, struct http_response_s* response);
#ifdef __cplusplus
}
#endif
// Minimal example usage.
#ifdef HTTPSERVER_EXAMPLE
#define RESPONSE "Hello, World!"
void handle_request(struct http_request_s* request) {
struct http_response_s* response = http_response_init();
http_response_status(response, 200);
http_response_header(response, "Content-Type", "text/plain");
http_response_body(response, RESPONSE, sizeof(RESPONSE) - 1);
http_respond(request, response);
}
int main() {
struct http_server_s* server = http_server_init(8080, handle_request);
http_server_listen(server);
}
#endif
#endif
#ifdef HTTPSERVER_IMPL
#ifndef HTTPSERVER_IMPL_ONCE
#define HTTPSERVER_IMPL_ONCE
#ifdef __linux__
#define EPOLL
#else
#define KQUEUE
#endif
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <netdb.h>
#include <unistd.h>
#include <string.h>
#include <stdarg.h>
#include <signal.h>
#include <limits.h>
#ifdef KQUEUE
#include <sys/event.h>
void http_server_listen_cb(struct kevent* ev);
void http_session_io_cb(struct kevent* ev);
#else
#include <sys/epoll.h>
#include <sys/timerfd.h>
typedef void (*epoll_cb_t)(struct epoll_event*);
void http_server_listen_cb(struct epoll_event* ev);
void http_session_io_cb(struct epoll_event* ev);
void http_server_timer_cb(struct epoll_event* ev);
void http_request_timer_cb(struct epoll_event* ev);
#endif
/******************************************************************************
*
* HTTP Parser
*
*****************************************************************************/
#define HTTP_METHOD 0
#define HTTP_TARGET 1
#define HTTP_VERSION 2
#define HTTP_HEADER_KEY 3
#define HTTP_HEADER_VALUE 4
#define HTTP_NONE 6
#define HTTP_BODY 7
typedef struct {
int index;
int len;
int type;
} http_token_t;
typedef struct {
int content_length;
int len;
int token_start_index;
int start;
int content_length_i;
char in_content_length;
char state;
char sub_state;
} http_parser_t;
#define HTTP_LWS 2
#define HTTP_CR 3
#define HTTP_CRLF 4
#define HTTP_HEADER_END 5
#define CONTENT_LENGTH_LOW "content-length"
#define CONTENT_LENGTH_UP "CONTENT-LENGTH"
#define PAYLOAD_TOO_LARGE -1
http_token_t http_parse(http_parser_t* parser, char* input, int n) {
for (int i = parser->start; i < n; ++i, parser->start = i + 1, parser->len++) {
char c = input[i];
switch (parser->state) {
case HTTP_METHOD:
if (c == ' ') {
http_token_t token = {
.index = parser->token_start_index,
.type = parser->state,
.len = parser->len
};
parser->state = HTTP_TARGET;
parser->len = 0;
parser->token_start_index = i + 1;
return token;
}
break;
case HTTP_TARGET:
if (c == ' ') {
http_token_t token = {
.index = parser->token_start_index,
.type = parser->state,
.len = parser->len
};
parser->state = HTTP_VERSION;
parser->token_start_index = i + 1;
parser->len = 0;
return token;
}
break;
case HTTP_VERSION:
if (c == '\r') {
parser->sub_state = HTTP_CR;
return (http_token_t) {
.index = parser->token_start_index,
.type = HTTP_VERSION,
.len = parser->len
};
} else if (parser->sub_state == HTTP_CR && c == '\n') {
parser->sub_state = 0;
parser->len = 0;
parser->token_start_index = i + 1;
parser->state = HTTP_HEADER_KEY;
}
break;
case HTTP_HEADER_KEY:
if (c == ':') {
parser->state = HTTP_HEADER_VALUE;
parser->sub_state = HTTP_LWS;
if (parser->len == parser->content_length_i + 1) parser->in_content_length = 1;
parser->content_length_i = 0;
return (http_token_t) {
.index = parser->token_start_index,
.type = HTTP_HEADER_KEY,
.len = parser->len - 1
};
} else if (
(c == CONTENT_LENGTH_UP[parser->content_length_i] ||
c == CONTENT_LENGTH_LOW[parser->content_length_i]) &&
parser->content_length_i < sizeof(CONTENT_LENGTH_LOW) - 1
) {
parser->content_length_i++;
}
break;
case HTTP_HEADER_VALUE:
if (parser->sub_state == HTTP_LWS && (c == ' ' || c == '\t' || c == '\r' || c == '\n')) {
continue;
} else if (parser->sub_state == HTTP_LWS) {
parser->sub_state = 0;
parser->len = 0;
parser->token_start_index = i;
if (parser->in_content_length) {
parser->content_length *= 10;
parser->content_length += c - '0';
}
} else if (parser->sub_state != HTTP_LWS && c == '\r') {
parser->sub_state = HTTP_CR;
parser->state = HTTP_HEADER_END;
parser->in_content_length = 0;
return (http_token_t) {
.index = parser->token_start_index,
.type = HTTP_HEADER_VALUE,
.len = parser->len
};
} else if (parser->in_content_length && parser->content_length != PAYLOAD_TOO_LARGE) {
int64_t new_content_length = parser->content_length * 10l;
new_content_length += c - '0';
if (new_content_length > INT_MAX) {
parser->content_length = PAYLOAD_TOO_LARGE;
} else {
parser->content_length = (int)new_content_length;
}
}
break;
case HTTP_HEADER_END:
if (parser->sub_state == 0 && c == '\r') {
parser->sub_state = HTTP_CR;
} else if (parser->sub_state == HTTP_CR && c == '\n') {
parser->sub_state = HTTP_CRLF;
} else if (parser->sub_state == HTTP_CRLF && c == '\r') {
parser->sub_state = 0;
parser->state = HTTP_BODY;
return (http_token_t) {
.index = i + 2,
.type = HTTP_BODY,
.len = parser->content_length
};
} else if (parser->sub_state == HTTP_CRLF && c != '\r') {
parser->sub_state = 0;
parser->len = 0;
parser->token_start_index = i;
i--;
parser->state = HTTP_HEADER_KEY;
}
break;
}
}
return (http_token_t) { .index = 0, .type = HTTP_NONE, .len = 0 };
}
/******************************************************************************
*
* HTTP Server
*
*****************************************************************************/
#define HTTP_READY 0x2
#define HTTP_RESPONSE_READY 0x4
#define HTTP_AUTOMATIC 0x8
#define HTTP_RESPONSE_PAUSED 0x10
#define HTTP_FLAG_SET(var, flag) var |= flag
#define HTTP_FLAG_CLEAR(var, flag) var &= ~flag
#define HTTP_FLAG_CHECK(var, flag) (var & flag)
typedef struct {
http_token_t* buf;
int capacity;
int size;
} http_token_dyn_t;
typedef struct http_ev_cb_s {
#ifdef KQUEUE
void (*handler)(struct kevent* ev);
#else
epoll_cb_t handler;
#endif
} ev_cb_t;
typedef struct http_request_s {
#ifdef KQUEUE
void (*handler)(struct kevent* ev);
#else
epoll_cb_t handler;
epoll_cb_t timer_handler;
int timerfd;
#endif
http_parser_t parser;
int state;
int socket;
char* buf;
int bytes;
int capacity;
int timeout;
struct http_server_s* server;
http_token_t token;
http_token_dyn_t tokens;
char flags;
} http_request_t;
typedef struct http_server_s {
#ifdef KQUEUE
void (*handler)(struct kevent* ev);
#else
epoll_cb_t handler;
epoll_cb_t timer_handler;
#endif
int socket;
int port;
int loop;
int timerfd;
socklen_t len;
void (*request_handler)(http_request_t*);
struct sockaddr_in addr;
char* date;
} http_server_t;
void http_token_dyn_push(http_token_dyn_t* dyn, http_token_t a) {
if (dyn->size == dyn->capacity) {
dyn->capacity *= 2;
dyn->buf = realloc(dyn->buf, dyn->capacity * sizeof(http_token_t));
}
dyn->buf[dyn->size] = a;
dyn->size++;
}
void http_token_dyn_init(http_token_dyn_t* dyn, int capacity) {
dyn->buf = malloc(sizeof(http_token_t) * capacity);
dyn->size = 0;
dyn->capacity = capacity;
}
#define BUF_SIZE 1024
void bind_localhost(int s, struct sockaddr_in* addr, int port) {
addr->sin_family = AF_INET;
addr->sin_addr.s_addr = INADDR_ANY;
addr->sin_port = htons(port);
int rc = bind(s, (struct sockaddr *)addr, sizeof(struct sockaddr_in));;
if (rc < 0) {
exit(1);
}
}
void http_listen(http_server_t* serv) {
serv->socket = socket(AF_INET, SOCK_STREAM, 0);
int flag = 1;
setsockopt(serv->socket, SOL_SOCKET, SO_REUSEPORT, &flag, sizeof(flag));
bind_localhost(serv->socket, &serv->addr, serv->port);
serv->len = sizeof(serv->addr);
int flags = fcntl(serv->socket, F_GETFL, 0);
fcntl(serv->socket, F_SETFL, flags | O_NONBLOCK);
listen(serv->socket, 128);
}
int read_client_socket(http_request_t* session) {
if (!session->buf) {
session->buf = malloc(BUF_SIZE);
session->capacity = BUF_SIZE;
http_token_dyn_init(&session->tokens, 32);
}
int bytes;
do {
bytes = read(
session->socket,
session->buf + session->bytes,
session->capacity - session->bytes
);
if (bytes > 0) {
session->bytes += bytes;
HTTP_FLAG_SET(session->flags, HTTP_READY);
}
if (session->bytes == session->capacity) {
session->capacity *= 2;
session->buf = realloc(session->buf, session->capacity);
}
} while (bytes > 0);
return bytes == 0 ? 0 : 1;
}
int write_client_socket(http_request_t* session) {
int bytes = write(
session->socket,
session->buf + session->bytes,
session->capacity - session->bytes
);
if (bytes > 0) session->bytes += bytes;
return errno == EPIPE ? 0 : 1;
}
void free_buffer(http_request_t* session) {
if (session->buf) {
free(session->buf);
session->buf = NULL;
free(session->tokens.buf);
session->tokens.buf = NULL;
}
}
void parse_tokens(http_request_t* session) {
http_token_t token;
do {
token = http_parse(&session->parser, session->buf, session->bytes);
if (token.type != HTTP_NONE) {
session->token = token;
http_token_dyn_push(&session->tokens, token);
}
} while (token.type != HTTP_NONE);
HTTP_FLAG_CLEAR(session->flags, HTTP_READY);
}
void init_session(http_request_t* session) {
session->flags |= HTTP_AUTOMATIC;
session->parser = (http_parser_t){ };
session->bytes = 0;
session->buf = NULL;
session->token = (http_token_t){ .type = HTTP_NONE };
}
int parsing_headers(http_request_t* request) {
return request->token.type != HTTP_BODY;
}
int reading_body(http_request_t* request) {
if (request->token.type != HTTP_BODY || request->token.len == 0) return 0;
int size = request->token.index + request->token.len;
return request->bytes < size;
}
void end_session(http_request_t* session) {
#ifdef KQUEUE
struct kevent ev_set;
EV_SET(&ev_set, session->socket, EVFILT_TIMER, EV_DELETE, 0, 0, session);
kevent(session->server->loop, &ev_set, 1, NULL, 0, NULL);
#else
epoll_ctl(session->server->loop, EPOLL_CTL_DEL, session->socket, NULL);
epoll_ctl(session->server->loop, EPOLL_CTL_DEL, session->timerfd, NULL);
close(session->timerfd);
#endif
close(session->socket);
free_buffer(session);
free(session);
}
#define HTTP_SESSION_INIT 0
#define HTTP_SESSION_READ_HEADERS 1
#define HTTP_SESSION_READ_BODY 2
#define HTTP_SESSION_WRITE 3
void reset_timeout(http_request_t* request, int time) {
request->timeout = time;
}
void write_response(http_request_t* request) {
if (!write_client_socket(request)) { return end_session(request); }
if (request->bytes != request->capacity) {
#ifdef KQUEUE
struct kevent ev_set[2];
EV_SET(&ev_set[0], request->socket, EVFILT_READ, EV_DELETE, 0, 0, NULL);
EV_SET(&ev_set[1], request->socket, EVFILT_WRITE, EV_ADD, 0, 0, request);
kevent(request->server->loop, ev_set, 2, NULL, 0, NULL);
#else
struct epoll_event ev;
ev.events = EPOLLOUT | EPOLLET;
ev.data.ptr = request;
epoll_ctl(request->server->loop, EPOLL_CTL_MOD, request->socket, &ev);
#endif
request->state = HTTP_SESSION_WRITE;
reset_timeout(request, 20);
} else if (HTTP_FLAG_CHECK(request->flags, HTTP_KEEP_ALIVE)) {
request->state = HTTP_SESSION_INIT;
free_buffer(request);
reset_timeout(request, 120);
} else {
return end_session(request);
}
}
void exec_response_handler(http_request_t* request) {
request->server->request_handler(request);
if (HTTP_FLAG_CHECK(request->flags, HTTP_RESPONSE_READY)) {
write_response(request);
} else {
request->state = HTTP_SESSION_WRITE;
HTTP_FLAG_SET(request->flags, HTTP_RESPONSE_PAUSED);
}
}
void error_response(http_request_t* request, int code, char const * message) {
struct http_response_s* response = http_response_init();
http_response_status(response, code);
http_response_header(response, "Content-Type", "text/plain");
http_response_body(response, message, strlen(message));
http_respond(request, response);
write_response(request);
}
void http_session(http_request_t* request) {
switch (request->state) {
case HTTP_SESSION_INIT:
init_session(request);
request->state = HTTP_SESSION_READ_HEADERS;
// fallthrough
case HTTP_SESSION_READ_HEADERS:
if (!read_client_socket(request)) { return end_session(request); }
parse_tokens(request);
if (!parsing_headers(request) && request->parser.content_length == PAYLOAD_TOO_LARGE) {
return error_response(request, 413, "Payload Too Large");
} else if (reading_body(request)) {
request->state = HTTP_SESSION_READ_BODY;
} else if (!parsing_headers(request)) {
return exec_response_handler(request);
}
reset_timeout(request, 20);
break;
case HTTP_SESSION_READ_BODY:
if (!read_client_socket(request)) { return end_session(request); }
if (!reading_body(request)) { return exec_response_handler(request); }
reset_timeout(request, 20);
break;
case HTTP_SESSION_WRITE:
write_response(request);
break;
}
}
void accept_connections(http_server_t* server) {
int sock = 0;
do {
sock = accept(server->socket, (struct sockaddr *)&server->addr, &server->len);
if (sock > 0) {
http_request_t* session = malloc(sizeof(http_request_t));
*session = (http_request_t) { .socket = sock, .server = server, .timeout = 20 };
session->handler = http_session_io_cb;
int flags = fcntl(sock, F_GETFL, 0);
fcntl(sock, F_SETFL, flags | O_NONBLOCK);
#ifdef KQUEUE
struct kevent ev_set[2];
EV_SET(&ev_set[0], sock, EVFILT_READ, EV_ADD, 0, 0, session);
EV_SET(&ev_set[1], sock, EVFILT_TIMER, EV_ADD | EV_ENABLE, NOTE_SECONDS, 1, session);
kevent(server->loop, ev_set, 2, NULL, 0, NULL);
#else
session->timer_handler = http_request_timer_cb;
struct epoll_event ev;
ev.events = EPOLLIN | EPOLLET;
ev.data.ptr = session;
epoll_ctl(server->loop, EPOLL_CTL_ADD, sock, &ev);
int tfd = timerfd_create(CLOCK_MONOTONIC, 0);
struct itimerspec ts = {};
ts.it_value.tv_sec = 1;
ts.it_interval.tv_sec = 1;
timerfd_settime(tfd, 0, &ts, NULL);
ev.events = EPOLLIN | EPOLLET;
ev.data.ptr = &session->timer_handler;
epoll_ctl(server->loop, EPOLL_CTL_ADD, tfd, &ev);
session->timerfd = tfd;
#endif
http_session(session);
}
} while (sock > 0);
}
void generate_date_time(char** datetime) {
time_t rawtime;
struct tm * timeinfo;
time(&rawtime);
timeinfo = localtime(&rawtime);
*datetime = asctime(timeinfo);
}
#ifdef KQUEUE
void http_server_listen_cb(struct kevent* ev) {
http_server_t* server = (http_server_t*)ev->udata;
if (ev->filter == EVFILT_TIMER) {
generate_date_time(&server->date);
} else {
accept_connections(server);
}
}
void http_session_io_cb(struct kevent* ev) {
http_request_t* request = (http_request_t*)ev->udata;
if (ev->filter == EVFILT_TIMER) {
request->timeout -= 1;
if (request->timeout == 0) end_session(request);
} else {
http_session(request);
}
}
#else
void http_server_listen_cb(struct epoll_event* ev) {
accept_connections((http_server_t*)ev->data.ptr);
}
void http_session_io_cb(struct epoll_event* ev) {
http_session((http_request_t*)ev->data.ptr);
}
void http_server_timer_cb(struct epoll_event* ev) {
http_server_t* server = (http_server_t*)(ev->data.ptr - sizeof(epoll_cb_t));
uint64_t res;
int bytes = read(server->timerfd, &res, sizeof(res));
generate_date_time(&server->date);
}
void http_request_timer_cb(struct epoll_event* ev) {
http_request_t* request = (http_request_t*)(ev->data.ptr - sizeof(epoll_cb_t));
uint64_t res;
int bytes = read(request->timerfd, &res, sizeof(res));
request->timeout -= 1;
if (request->timeout == 0) end_session(request);
}
#endif
http_server_t* http_server_init(int port, void (*handler)(http_request_t*)) {
http_server_t* serv = malloc(sizeof(http_server_t));
serv->port = port;
serv->handler = http_server_listen_cb;
#ifdef KQUEUE
serv->loop = kqueue();
struct kevent ev_set;
EV_SET(&ev_set, serv->socket, EVFILT_TIMER, EV_ADD | EV_ENABLE, NOTE_SECONDS, 1, serv);
kevent(serv->loop, &ev_set, 1, NULL, 0, NULL);
#else
serv->loop = epoll_create1(0);
serv->timer_handler = http_server_timer_cb;
int tfd = timerfd_create(CLOCK_MONOTONIC, 0);
struct itimerspec ts = {};
ts.it_value.tv_sec = 1;
ts.it_interval.tv_sec = 1;
timerfd_settime(tfd, 0, &ts, NULL);
struct epoll_event ev;
ev.events = EPOLLIN | EPOLLET;
ev.data.ptr = &serv->timer_handler;
epoll_ctl(serv->loop, EPOLL_CTL_ADD, tfd, &ev);
serv->timerfd = tfd;
#endif
generate_date_time(&serv->date);
serv->request_handler = handler;
return serv;
}
int http_server_listen(http_server_t* serv) {
signal(SIGPIPE, SIG_IGN);
http_listen(serv);
#ifdef KQUEUE
struct kevent ev_set;
EV_SET(&ev_set, serv->socket, EVFILT_READ, EV_ADD, 0, 0, serv);
kevent(serv->loop, &ev_set, 1, NULL, 0, NULL);
struct kevent ev_list[32];
while (1) {
int nev = kevent(serv->loop, NULL, 0, ev_list, 32, NULL);
for (int i = 0; i < nev; i++) {
ev_cb_t* ev_cb = (ev_cb_t*)ev_list[i].udata;
ev_cb->handler(&ev_list[i]);
}
}
#else
struct epoll_event ev, ev_list[32];
ev.events = EPOLLIN | EPOLLET;
ev.data.ptr = serv;
epoll_ctl(serv->loop, EPOLL_CTL_ADD, serv->socket, &ev);
while (1) {
int nev = epoll_wait(serv->loop, ev_list, 32, -1);
for (int i = 0; i < nev; i++) {
ev_cb_t* ev_cb = (ev_cb_t*)ev_list[i].data.ptr;
ev_cb->handler(&ev_list[i]);
}
}
#endif
return 0;
}
int http_server_loop(http_server_t* server) {
return server->loop;
}
/******************************************************************************
*
* HTTP Request
*
*****************************************************************************/
typedef struct http_string_s http_string_t;
http_string_t http_get_token_string(http_request_t* request, int token_type) {
for (int i = 0; i < request->tokens.size; i++) {
http_token_t token = request->tokens.buf[i];
if (token.type == token_type) {
return (http_string_t) {
.buf = &request->buf[token.index],
.len = token.len
};
}
}
return (http_string_t) { };
}
int case_insensitive_cmp(char const * a, char const * b, int len) {
for (int i = 0; i < len; i++) {
char c1 = a[i] >= 'A' && a[i] <= 'Z' ? a[i] + 32 : a[i];
char c2 = b[i] >= 'A' && b[i] <= 'Z' ? b[i] + 32 : b[i];
if (c1 != c2) return 0;
}
return 1;
}
http_string_t http_request_method(http_request_t* request) {
return http_get_token_string(request, HTTP_METHOD);
}
http_string_t http_request_target(http_request_t* request) {
return http_get_token_string(request, HTTP_TARGET);
}
http_string_t http_request_body(http_request_t* request) {
return http_get_token_string(request, HTTP_BODY);
}
int assign_iteration_headers(
http_request_t* request,
http_string_t* key,
http_string_t* val,
int* iter
) {
http_token_t token = request->tokens.buf[*iter];
if (request->tokens.buf[*iter].type == HTTP_BODY) return 0;
*key = (http_string_t) {
.buf = &request->buf[token.index],
.len = token.len
};
(*iter)++;
token = request->tokens.buf[*iter];
*val = (http_string_t) {
.buf = &request->buf[token.index],
.len = token.len
};
return 1;
}
int http_request_iterate_headers(
http_request_t* request,
http_string_t* key,
http_string_t* val,
int* iter
) {
if (*iter == 0) {
for ( ; *iter < request->tokens.size; (*iter)++) {
http_token_t token = request->tokens.buf[*iter];
if (token.type == HTTP_HEADER_KEY) {
return assign_iteration_headers(request, key, val, iter);
}
}
return 0;
} else {
(*iter)++;
return assign_iteration_headers(request, key, val, iter);
}
}
http_string_t http_request_header(http_request_t* request, char const * key) {
int len = strlen(key);
for (int i = 0; i < request->tokens.size; i++) {
http_token_t token = request->tokens.buf[i];
if (token.type == HTTP_HEADER_KEY && token.len == len) {
if (case_insensitive_cmp(&request->buf[token.index], key, len)) {
token = request->tokens.buf[i + 1];
return (http_string_t) {
.buf = &request->buf[token.index],
.len = token.len
};
}
}
}
return (http_string_t) { };
}
void http_request_free_buffer(http_request_t* request) {
free_buffer(request);
}
#define HTTP_1_0 0
#define HTTP_1_1 1
void auto_detect_keep_alive(http_request_t* request) {
http_string_t str = http_get_token_string(request, HTTP_VERSION);
int version = str.buf[str.len - 1] == '1';
str = http_request_header(request, "Connection");
if (
(str.len == 5 && case_insensitive_cmp(str.buf, "close", 5)) ||
(str.len == 0 && version == HTTP_1_0)
) {
HTTP_FLAG_CLEAR(request->flags, HTTP_KEEP_ALIVE);
} else {
HTTP_FLAG_SET(request->flags, HTTP_KEEP_ALIVE);
}
}
void http_request_connection(http_request_t* request, int directive) {
if (directive == HTTP_KEEP_ALIVE) {
HTTP_FLAG_CLEAR(request->flags, HTTP_AUTOMATIC);
HTTP_FLAG_SET(request->flags, HTTP_KEEP_ALIVE);
} else if (directive == HTTP_CLOSE) {
HTTP_FLAG_CLEAR(request->flags, HTTP_AUTOMATIC);
HTTP_FLAG_CLEAR(request->flags, HTTP_KEEP_ALIVE);
}
}
/******************************************************************************
*
* HTTP Response
*
*****************************************************************************/
typedef struct http_header_s {
char const * key;
char const * value;
struct http_header_s* next;
} http_header_t;
typedef struct http_response_s {
http_header_t* headers;
char const * body;
int content_length;
int status;
} http_response_t;
#define RESPONSE_BUF_SIZE 512
char const * status_text[] = {
"", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "",
"", "", "", "", "", "", "", "", "", "",
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