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http-connect.c revision 1.1.1.1 
      1 /*	$NetBSD: http-connect.c,v 1.1.1.1 2017/01/31 21:14:53 christos Exp $	*/
      2 #include "event2/event-config.h"
      3 #include <sys/cdefs.h>
      4 __RCSID("$NetBSD: http-connect.c,v 1.1.1.1 2017/01/31 21:14:53 christos Exp $");
      5 
      6 #include <event2/event.h>
      7 #include <event2/http.h>
      8 #include <event2/http_struct.h>
      9 #include <event2/buffer.h>
     10 #include <stdlib.h>
     11 #include <stdio.h>
     12 #include <limits.h>
     13 
     14 #define VERIFY(cond) do {                       \
     15 	if (!(cond)) {                              \
     16 		fprintf(stderr, "[error] %s\n", #cond); \
     17 	}                                           \
     18 } while (0);                                    \
     19 
     20 #define URL_MAX 4096
     21 
     22 struct connect_base
     23 {
     24 	struct evhttp_connection *evcon;
     25 	struct evhttp_uri *location;
     26 };
     27 
     28 static void get_cb(struct evhttp_request *req, void *arg)
     29 {
     30 	ev_ssize_t len;
     31 	struct evbuffer *evbuf;
     32 
     33 	VERIFY(req);
     34 
     35 	evbuf = evhttp_request_get_input_buffer(req);
     36 	len = evbuffer_get_length(evbuf);
     37 	fwrite(evbuffer_pullup(evbuf, len), len, 1, stdout);
     38 	evbuffer_drain(evbuf, len);
     39 }
     40 
     41 static void connect_cb(struct evhttp_request *proxy_req, void *arg)
     42 {
     43 	char buffer[URL_MAX];
     44 
     45 	struct connect_base *base = arg;
     46 	struct evhttp_connection *evcon = base->evcon;
     47 	struct evhttp_uri *location = base->location;
     48 
     49 	VERIFY(proxy_req);
     50 	if (evcon) {
     51 		struct evhttp_request *req = evhttp_request_new(get_cb, NULL);
     52 		evhttp_add_header(req->output_headers, "Connection", "close");
     53 		VERIFY(!evhttp_make_request(evcon, req, EVHTTP_REQ_GET,
     54 			evhttp_uri_join(location, buffer, URL_MAX)));
     55 	}
     56 }
     57 
     58 int main(int argc, const char **argv)
     59 {
     60 	char buffer[URL_MAX];
     61 
     62 	struct evhttp_uri *host_port;
     63 	struct evhttp_uri *location;
     64 	struct evhttp_uri *proxy;
     65 
     66 	struct event_base *base;
     67 	struct evhttp_connection *evcon;
     68 	struct evhttp_request *req;
     69 
     70 	struct connect_base connect_base;
     71 
     72 	if (argc != 3) {
     73 		printf("Usage: %s proxy url\n", argv[0]);
     74 		return 1;
     75 	}
     76 
     77 	{
     78 		proxy = evhttp_uri_parse(argv[1]);
     79 		VERIFY(evhttp_uri_get_host(proxy));
     80 		VERIFY(evhttp_uri_get_port(proxy) > 0);
     81 	}
     82 	{
     83 		host_port = evhttp_uri_parse(argv[2]);
     84 		evhttp_uri_set_scheme(host_port, NULL);
     85 		evhttp_uri_set_userinfo(host_port, NULL);
     86 		evhttp_uri_set_path(host_port, NULL);
     87 		evhttp_uri_set_query(host_port, NULL);
     88 		evhttp_uri_set_fragment(host_port, NULL);
     89 		VERIFY(evhttp_uri_get_host(host_port));
     90 		VERIFY(evhttp_uri_get_port(host_port) > 0);
     91 	}
     92 	{
     93 		location = evhttp_uri_parse(argv[2]);
     94 		evhttp_uri_set_scheme(location, NULL);
     95 		evhttp_uri_set_userinfo(location, 0);
     96 		evhttp_uri_set_host(location, NULL);
     97 		evhttp_uri_set_port(location, -1);
     98 	}
     99 
    100 	VERIFY(base = event_base_new());
    101 	VERIFY(evcon = evhttp_connection_base_new(base, NULL,
    102 		evhttp_uri_get_host(proxy), evhttp_uri_get_port(proxy)));
    103 	connect_base.evcon = evcon;
    104 	connect_base.location = location;
    105 	VERIFY(req = evhttp_request_new(connect_cb, &connect_base));
    106 
    107 	evhttp_add_header(req->output_headers, "Connection", "keep-alive");
    108 	evhttp_add_header(req->output_headers, "Proxy-Connection", "keep-alive");
    109 	evutil_snprintf(buffer, URL_MAX, "%s:%d",
    110 		evhttp_uri_get_host(host_port), evhttp_uri_get_port(host_port));
    111 	evhttp_make_request(evcon, req, EVHTTP_REQ_CONNECT, buffer);
    112 
    113 	event_base_dispatch(base);
    114 	evhttp_connection_free(evcon);
    115 	event_base_free(base);
    116 	evhttp_uri_free(proxy);
    117 	evhttp_uri_free(host_port);
    118 	evhttp_uri_free(location);
    119 	return 0;
    120 }
    121