1 #include "event2/event-config.h"
2
3 #include <event2/event.h>
4 #include <event2/http.h>
5 #include <event2/http_struct.h>
6 #include <event2/buffer.h>
7 #include <stdlib.h>
8 #include <stdio.h>
9 #include <limits.h>
10
11 #define VERIFY(cond) do { \
12 if (!(cond)) { \
13 fprintf(stderr, "[error] %s\n", #cond); \
14 exit(EXIT_FAILURE); \
15 } \
16 } while (0); \
17
18 #define URL_MAX 4096
19
20 struct connect_base
21 {
22 struct evhttp_connection *evcon;
23 struct evhttp_uri *location;
24 };
25
uri_parse(const char * str)26 static struct evhttp_uri* uri_parse(const char *str)
27 {
28 struct evhttp_uri *uri;
29 VERIFY(uri = evhttp_uri_parse(str));
30 VERIFY(evhttp_uri_get_host(uri));
31 VERIFY(evhttp_uri_get_port(uri) > 0);
32 return uri;
33 }
uri_path(struct evhttp_uri * uri,char buffer[URL_MAX])34 static char* uri_path(struct evhttp_uri *uri, char buffer[URL_MAX])
35 {
36 struct evhttp_uri *path;
37
38 VERIFY(evhttp_uri_join(uri, buffer, URL_MAX));
39
40 path = evhttp_uri_parse(buffer);
41 evhttp_uri_set_scheme(path, NULL);
42 evhttp_uri_set_userinfo(path, 0);
43 evhttp_uri_set_host(path, NULL);
44 evhttp_uri_set_port(path, -1);
45 VERIFY(evhttp_uri_join(path, buffer, URL_MAX));
46 return buffer;
47 }
uri_hostport(struct evhttp_uri * uri,char buffer[URL_MAX])48 static char* uri_hostport(struct evhttp_uri *uri, char buffer[URL_MAX])
49 {
50 VERIFY(evhttp_uri_join(uri, buffer, URL_MAX));
51 VERIFY(evhttp_uri_get_host(uri));
52 VERIFY(evhttp_uri_get_port(uri) > 0);
53 evutil_snprintf(buffer, URL_MAX, "%s:%d",
54 evhttp_uri_get_host(uri), evhttp_uri_get_port(uri));
55 return buffer;
56 }
57
get_cb(struct evhttp_request * req,void * arg)58 static void get_cb(struct evhttp_request *req, void *arg)
59 {
60 ev_ssize_t len;
61 struct evbuffer *evbuf;
62
63 VERIFY(req);
64
65 evbuf = evhttp_request_get_input_buffer(req);
66 len = evbuffer_get_length(evbuf);
67 fwrite(evbuffer_pullup(evbuf, len), len, 1, stdout);
68 evbuffer_drain(evbuf, len);
69 }
70
connect_cb(struct evhttp_request * proxy_req,void * arg)71 static void connect_cb(struct evhttp_request *proxy_req, void *arg)
72 {
73 struct connect_base *base = arg;
74 struct evhttp_connection *evcon = base->evcon;
75 struct evhttp_uri *location = base->location;
76 struct evhttp_request *req;
77 char buffer[URL_MAX];
78
79 VERIFY(proxy_req);
80 VERIFY(evcon);
81
82 req = evhttp_request_new(get_cb, NULL);
83 evhttp_add_header(req->output_headers, "Connection", "close");
84 evhttp_add_header(req->output_headers, "Host", evhttp_uri_get_host(location));
85 VERIFY(!evhttp_make_request(evcon, req, EVHTTP_REQ_GET,
86 uri_path(location, buffer)));
87 }
88
main(int argc,const char ** argv)89 int main(int argc, const char **argv)
90 {
91 char hostport[URL_MAX];
92
93 struct evhttp_uri *location;
94 struct evhttp_uri *proxy;
95
96 struct event_base *base;
97 struct evhttp_connection *evcon;
98 struct evhttp_request *req;
99
100 struct connect_base connect_base;
101
102 if (argc != 3) {
103 printf("Usage: %s proxy url\n", argv[0]);
104 return 1;
105 }
106
107 proxy = uri_parse(argv[1]);
108 location = uri_parse(argv[2]);
109
110 VERIFY(base = event_base_new());
111 VERIFY(evcon = evhttp_connection_base_new(base, NULL,
112 evhttp_uri_get_host(proxy), evhttp_uri_get_port(proxy)));
113 connect_base.evcon = evcon;
114 connect_base.location = location;
115 VERIFY(req = evhttp_request_new(connect_cb, &connect_base));
116
117 uri_hostport(location, hostport);
118 evhttp_add_header(req->output_headers, "Connection", "keep-alive");
119 evhttp_add_header(req->output_headers, "Proxy-Connection", "keep-alive");
120 evhttp_add_header(req->output_headers, "Host", hostport);
121 evhttp_make_request(evcon, req, EVHTTP_REQ_CONNECT, hostport);
122
123 event_base_dispatch(base);
124
125 evhttp_connection_free(evcon);
126 event_base_free(base);
127 evhttp_uri_free(proxy);
128 evhttp_uri_free(location);
129
130 return 0;
131 }
132