Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 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); \ |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 14 | exit(EXIT_FAILURE); \ |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 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 | |
| 26 | static void get_cb(struct evhttp_request *req, void *arg) |
| 27 | { |
| 28 | ev_ssize_t len; |
| 29 | struct evbuffer *evbuf; |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 30 | struct evhttp_connection *evcon; |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 31 | |
| 32 | VERIFY(req); |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 33 | evcon = evhttp_request_get_connection(req); |
| 34 | VERIFY(evcon); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 35 | |
| 36 | evbuf = evhttp_request_get_input_buffer(req); |
| 37 | len = evbuffer_get_length(evbuf); |
| 38 | fwrite(evbuffer_pullup(evbuf, len), len, 1, stdout); |
| 39 | evbuffer_drain(evbuf, len); |
| 40 | } |
| 41 | |
| 42 | static void connect_cb(struct evhttp_request *proxy_req, void *arg) |
| 43 | { |
| 44 | char buffer[URL_MAX]; |
| 45 | |
| 46 | struct connect_base *base = arg; |
| 47 | struct evhttp_connection *evcon = base->evcon; |
| 48 | struct evhttp_uri *location = base->location; |
| 49 | |
| 50 | VERIFY(proxy_req); |
| 51 | if (evcon) { |
| 52 | struct evhttp_request *req = evhttp_request_new(get_cb, NULL); |
| 53 | evhttp_add_header(req->output_headers, "Connection", "close"); |
| 54 | VERIFY(!evhttp_make_request(evcon, req, EVHTTP_REQ_GET, |
| 55 | evhttp_uri_join(location, buffer, URL_MAX))); |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | int main(int argc, const char **argv) |
| 60 | { |
| 61 | char buffer[URL_MAX]; |
| 62 | |
| 63 | struct evhttp_uri *host_port; |
| 64 | struct evhttp_uri *location; |
| 65 | struct evhttp_uri *proxy; |
| 66 | |
| 67 | struct event_base *base; |
| 68 | struct evhttp_connection *evcon; |
| 69 | struct evhttp_request *req; |
| 70 | |
| 71 | struct connect_base connect_base; |
| 72 | |
| 73 | if (argc != 3) { |
| 74 | printf("Usage: %s proxy url\n", argv[0]); |
| 75 | return 1; |
| 76 | } |
| 77 | |
| 78 | { |
Haibo Huang | b227967 | 2019-05-31 16:12:39 -0700 | [diff] [blame] | 79 | VERIFY(proxy = evhttp_uri_parse(argv[1])); |
Narayan Kamath | fc74cb4 | 2017-09-13 12:53:52 +0100 | [diff] [blame] | 80 | VERIFY(evhttp_uri_get_host(proxy)); |
| 81 | VERIFY(evhttp_uri_get_port(proxy) > 0); |
| 82 | } |
| 83 | { |
| 84 | host_port = evhttp_uri_parse(argv[2]); |
| 85 | evhttp_uri_set_scheme(host_port, NULL); |
| 86 | evhttp_uri_set_userinfo(host_port, NULL); |
| 87 | evhttp_uri_set_path(host_port, NULL); |
| 88 | evhttp_uri_set_query(host_port, NULL); |
| 89 | evhttp_uri_set_fragment(host_port, NULL); |
| 90 | VERIFY(evhttp_uri_get_host(host_port)); |
| 91 | VERIFY(evhttp_uri_get_port(host_port) > 0); |
| 92 | } |
| 93 | { |
| 94 | location = evhttp_uri_parse(argv[2]); |
| 95 | evhttp_uri_set_scheme(location, NULL); |
| 96 | evhttp_uri_set_userinfo(location, 0); |
| 97 | evhttp_uri_set_host(location, NULL); |
| 98 | evhttp_uri_set_port(location, -1); |
| 99 | } |
| 100 | |
| 101 | VERIFY(base = event_base_new()); |
| 102 | VERIFY(evcon = evhttp_connection_base_new(base, NULL, |
| 103 | evhttp_uri_get_host(proxy), evhttp_uri_get_port(proxy))); |
| 104 | connect_base.evcon = evcon; |
| 105 | connect_base.location = location; |
| 106 | VERIFY(req = evhttp_request_new(connect_cb, &connect_base)); |
| 107 | |
| 108 | evhttp_add_header(req->output_headers, "Connection", "keep-alive"); |
| 109 | evhttp_add_header(req->output_headers, "Proxy-Connection", "keep-alive"); |
| 110 | evutil_snprintf(buffer, URL_MAX, "%s:%d", |
| 111 | evhttp_uri_get_host(host_port), evhttp_uri_get_port(host_port)); |
| 112 | evhttp_make_request(evcon, req, EVHTTP_REQ_CONNECT, buffer); |
| 113 | |
| 114 | event_base_dispatch(base); |
| 115 | evhttp_connection_free(evcon); |
| 116 | event_base_free(base); |
| 117 | evhttp_uri_free(proxy); |
| 118 | evhttp_uri_free(host_port); |
| 119 | evhttp_uri_free(location); |
| 120 | return 0; |
| 121 | } |