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      1 /*	$NetBSD: http-connect.c,v 1.2 2024/08/18 20:47:23 christos Exp $	*/
      2 
      3 #include "event2/event-config.h"
      4 
      5 #include <event2/event.h>
      6 #include <event2/http.h>
      7 #include <event2/http_struct.h>
      8 #include <event2/buffer.h>
      9 #include <stdlib.h>
     10 #include <stdio.h>
     11 #include <limits.h>
     12 
     13 #define VERIFY(cond) do {                       \
     14 	if (!(cond)) {                              \
     15 		fprintf(stderr, "[error] %s\n", #cond); \
     16 		exit(EXIT_FAILURE);                     \
     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 struct evhttp_uri* uri_parse(const char *str)
     29 {
     30 	struct evhttp_uri *uri;
     31 	VERIFY(uri = evhttp_uri_parse(str));
     32 	VERIFY(evhttp_uri_get_host(uri));
     33 	VERIFY(evhttp_uri_get_port(uri) > 0);
     34 	return uri;
     35 }
     36 static char* uri_path(struct evhttp_uri *uri, char buffer[URL_MAX])
     37 {
     38 	struct evhttp_uri *path;
     39 
     40 	VERIFY(evhttp_uri_join(uri, buffer, URL_MAX));
     41 
     42 	path = evhttp_uri_parse(buffer);
     43 	evhttp_uri_set_scheme(path, NULL);
     44 	evhttp_uri_set_userinfo(path, 0);
     45 	evhttp_uri_set_host(path, NULL);
     46 	evhttp_uri_set_port(path, -1);
     47 	VERIFY(evhttp_uri_join(path, buffer, URL_MAX));
     48 	return buffer;
     49 }
     50 static char* uri_hostport(struct evhttp_uri *uri, char buffer[URL_MAX])
     51 {
     52 	VERIFY(evhttp_uri_join(uri, buffer, URL_MAX));
     53 	VERIFY(evhttp_uri_get_host(uri));
     54 	VERIFY(evhttp_uri_get_port(uri) > 0);
     55 	evutil_snprintf(buffer, URL_MAX, "%s:%d",
     56 		evhttp_uri_get_host(uri), evhttp_uri_get_port(uri));
     57 	return buffer;
     58 }
     59 
     60 static void get_cb(struct evhttp_request *req, void *arg)
     61 {
     62 	ev_ssize_t len;
     63 	struct evbuffer *evbuf;
     64 
     65 	VERIFY(req);
     66 
     67 	evbuf = evhttp_request_get_input_buffer(req);
     68 	len = evbuffer_get_length(evbuf);
     69 	fwrite(evbuffer_pullup(evbuf, len), len, 1, stdout);
     70 	evbuffer_drain(evbuf, len);
     71 }
     72 
     73 static void connect_cb(struct evhttp_request *proxy_req, void *arg)
     74 {
     75 	struct connect_base *base = arg;
     76 	struct evhttp_connection *evcon = base->evcon;
     77 	struct evhttp_uri *location = base->location;
     78 	struct evhttp_request *req;
     79 	char buffer[URL_MAX];
     80 
     81 	VERIFY(proxy_req);
     82 	VERIFY(evcon);
     83 
     84 	req = evhttp_request_new(get_cb, NULL);
     85 	evhttp_add_header(req->output_headers, "Connection", "close");
     86 	evhttp_add_header(req->output_headers, "Host", evhttp_uri_get_host(location));
     87 	VERIFY(!evhttp_make_request(evcon, req, EVHTTP_REQ_GET,
     88 		uri_path(location, buffer)));
     89 }
     90 
     91 int main(int argc, const char **argv)
     92 {
     93 	char hostport[URL_MAX];
     94 
     95 	struct evhttp_uri *location;
     96 	struct evhttp_uri *proxy;
     97 
     98 	struct event_base *base;
     99 	struct evhttp_connection *evcon;
    100 	struct evhttp_request *req;
    101 
    102 	struct connect_base connect_base;
    103 
    104 	if (argc != 3) {
    105 		printf("Usage: %s proxy url\n", argv[0]);
    106 		return 1;
    107 	}
    108 
    109 	proxy    = uri_parse(argv[1]);
    110 	location = uri_parse(argv[2]);
    111 
    112 	VERIFY(base = event_base_new());
    113 	VERIFY(evcon = evhttp_connection_base_new(base, NULL,
    114 		evhttp_uri_get_host(proxy), evhttp_uri_get_port(proxy)));
    115 	connect_base.evcon = evcon;
    116 	connect_base.location = location;
    117 	VERIFY(req = evhttp_request_new(connect_cb, &connect_base));
    118 
    119 	uri_hostport(location, hostport);
    120 	evhttp_add_header(req->output_headers, "Connection", "keep-alive");
    121 	evhttp_add_header(req->output_headers, "Proxy-Connection", "keep-alive");
    122 	evhttp_add_header(req->output_headers, "Host", hostport);
    123 	evhttp_make_request(evcon, req, EVHTTP_REQ_CONNECT, hostport);
    124 
    125 	event_base_dispatch(base);
    126 
    127 	evhttp_connection_free(evcon);
    128 	event_base_free(base);
    129 	evhttp_uri_free(proxy);
    130 	evhttp_uri_free(location);
    131 
    132 	return 0;
    133 }
    134