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#include "event2/event-config.h"
#include <event2/event.h>
#include <event2/http.h>
#include <event2/http_struct.h>
#include <event2/buffer.h>
#include <stdlib.h>
#include <stdio.h>
#include <limits.h>
#define VERIFY(cond) do { \
if (!(cond)) { \
fprintf(stderr, "[error] %s\n", #cond); \
exit(EXIT_FAILURE); \
} \
} while (0); \
#define URL_MAX 4096
struct connect_base
{
struct evhttp_connection *evcon;
struct evhttp_uri *location;
};
static struct evhttp_uri* uri_parse(const char *str)
{
struct evhttp_uri *uri;
VERIFY(uri = evhttp_uri_parse(str));
VERIFY(evhttp_uri_get_host(uri));
VERIFY(evhttp_uri_get_port(uri) > 0);
return uri;
}
static char* uri_path(struct evhttp_uri *uri, char buffer[URL_MAX])
{
struct evhttp_uri *path;
VERIFY(evhttp_uri_join(uri, buffer, URL_MAX));
path = evhttp_uri_parse(buffer);
evhttp_uri_set_scheme(path, NULL);
evhttp_uri_set_userinfo(path, 0);
evhttp_uri_set_host(path, NULL);
evhttp_uri_set_port(path, -1);
VERIFY(evhttp_uri_join(path, buffer, URL_MAX));
return buffer;
}
static char* uri_hostport(struct evhttp_uri *uri, char buffer[URL_MAX])
{
VERIFY(evhttp_uri_join(uri, buffer, URL_MAX));
VERIFY(evhttp_uri_get_host(uri));
VERIFY(evhttp_uri_get_port(uri) > 0);
evutil_snprintf(buffer, URL_MAX, "%s:%d",
evhttp_uri_get_host(uri), evhttp_uri_get_port(uri));
return buffer;
}
static void get_cb(struct evhttp_request *req, void *arg)
{
ev_ssize_t len;
struct evbuffer *evbuf;
VERIFY(req);
evbuf = evhttp_request_get_input_buffer(req);
len = evbuffer_get_length(evbuf);
fwrite(evbuffer_pullup(evbuf, len), len, 1, stdout);
evbuffer_drain(evbuf, len);
}
static void connect_cb(struct evhttp_request *proxy_req, void *arg)
{
struct connect_base *base = arg;
struct evhttp_connection *evcon = base->evcon;
struct evhttp_uri *location = base->location;
struct evhttp_request *req;
char buffer[URL_MAX];
VERIFY(proxy_req);
VERIFY(evcon);
req = evhttp_request_new(get_cb, NULL);
evhttp_add_header(req->output_headers, "Connection", "close");
evhttp_add_header(req->output_headers, "Host", evhttp_uri_get_host(location));
VERIFY(!evhttp_make_request(evcon, req, EVHTTP_REQ_GET,
uri_path(location, buffer)));
}
int main(int argc, const char **argv)
{
char hostport[URL_MAX];
struct evhttp_uri *location;
struct evhttp_uri *proxy;
struct event_base *base;
struct evhttp_connection *evcon;
struct evhttp_request *req;
struct connect_base connect_base;
if (argc != 3) {
printf("Usage: %s proxy url\n", argv[0]);
return 1;
}
proxy = uri_parse(argv[1]);
location = uri_parse(argv[2]);
VERIFY(base = event_base_new());
VERIFY(evcon = evhttp_connection_base_new(base, NULL,
evhttp_uri_get_host(proxy), evhttp_uri_get_port(proxy)));
connect_base.evcon = evcon;
connect_base.location = location;
VERIFY(req = evhttp_request_new(connect_cb, &connect_base));
uri_hostport(location, hostport);
evhttp_add_header(req->output_headers, "Connection", "keep-alive");
evhttp_add_header(req->output_headers, "Proxy-Connection", "keep-alive");
evhttp_add_header(req->output_headers, "Host", hostport);
evhttp_make_request(evcon, req, EVHTTP_REQ_CONNECT, hostport);
event_base_dispatch(base);
evhttp_connection_free(evcon);
event_base_free(base);
evhttp_uri_free(proxy);
evhttp_uri_free(location);
return 0;
}