The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 1 | /* Copyright (C) 2007-2008 The Android Open Source Project |
| 2 | ** |
| 3 | ** This software is licensed under the terms of the GNU General Public |
| 4 | ** License version 2, as published by the Free Software Foundation, and |
| 5 | ** may be copied, distributed, and modified under those terms. |
| 6 | ** |
| 7 | ** This program is distributed in the hope that it will be useful, |
| 8 | ** but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | ** GNU General Public License for more details. |
| 11 | */ |
| 12 | #include "proxy_http_int.h" |
| 13 | #include <errno.h> |
| 14 | #include <stdio.h> |
| 15 | #include <string.h> |
| 16 | #include "qemu-common.h" |
| 17 | |
| 18 | /* A HttpConnector implements a non-HTTP proxied connection |
| 19 | * through the CONNECT method. Many firewalls are configured |
| 20 | * to reject these for port 80, so these connections should |
| 21 | * use a HttpRewriter instead. |
| 22 | */ |
| 23 | |
| 24 | typedef enum { |
| 25 | STATE_NONE = 0, |
| 26 | STATE_CONNECTING, /* connecting to the server */ |
| 27 | STATE_SEND_HEADER, /* connected, sending header to the server */ |
| 28 | STATE_RECEIVE_ANSWER_LINE1, |
| 29 | STATE_RECEIVE_ANSWER_LINE2 /* connected, reading server's answer */ |
| 30 | } ConnectorState; |
| 31 | |
| 32 | typedef struct Connection { |
| 33 | ProxyConnection root[1]; |
| 34 | ConnectorState state; |
| 35 | } Connection; |
| 36 | |
| 37 | |
| 38 | static void |
| 39 | connection_free( ProxyConnection* root ) |
| 40 | { |
| 41 | proxy_connection_done(root); |
| 42 | qemu_free(root); |
| 43 | } |
| 44 | |
| 45 | |
| 46 | |
| 47 | #define HTTP_VERSION "1.1" |
| 48 | |
| 49 | static int |
| 50 | connection_init( Connection* conn ) |
| 51 | { |
| 52 | HttpService* service = (HttpService*) conn->root->service; |
| 53 | ProxyConnection* root = conn->root; |
| 54 | stralloc_t* str = root->str; |
| 55 | |
| 56 | proxy_connection_rewind(root); |
| 57 | stralloc_add_format(str, "CONNECT %s HTTP/" HTTP_VERSION "\r\n", |
| 58 | sock_address_to_string(&root->address)); |
| 59 | |
| 60 | stralloc_add_bytes(str, service->footer, service->footer_len); |
| 61 | |
| 62 | if (!socket_connect( root->socket, &service->server_addr )) { |
| 63 | /* immediate connection ?? */ |
| 64 | conn->state = STATE_SEND_HEADER; |
| 65 | PROXY_LOG("%s: immediate connection", root->name); |
| 66 | } |
| 67 | else { |
| 68 | if (errno == EINPROGRESS || errno == EWOULDBLOCK) { |
| 69 | conn->state = STATE_CONNECTING; |
| 70 | PROXY_LOG("%s: connecting", root->name); |
| 71 | } |
| 72 | else { |
| 73 | PROXY_LOG("%s: cannot connect to proxy: %s", root->name, errno_str); |
| 74 | return -1; |
| 75 | } |
| 76 | } |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | |
| 81 | static void |
| 82 | connection_select( ProxyConnection* root, |
| 83 | ProxySelect* sel ) |
| 84 | { |
| 85 | unsigned flags; |
| 86 | Connection* conn = (Connection*)root; |
| 87 | |
| 88 | switch (conn->state) { |
| 89 | case STATE_RECEIVE_ANSWER_LINE1: |
| 90 | case STATE_RECEIVE_ANSWER_LINE2: |
| 91 | flags = PROXY_SELECT_READ; |
| 92 | break; |
| 93 | |
| 94 | case STATE_CONNECTING: |
| 95 | case STATE_SEND_HEADER: |
| 96 | flags = PROXY_SELECT_WRITE; |
| 97 | break; |
| 98 | |
| 99 | default: |
| 100 | flags = 0; |
| 101 | }; |
| 102 | proxy_select_set(sel, root->socket, flags); |
| 103 | } |
| 104 | |
| 105 | static void |
| 106 | connection_poll( ProxyConnection* root, |
| 107 | ProxySelect* sel ) |
| 108 | { |
| 109 | DataStatus ret = DATA_NEED_MORE; |
| 110 | Connection* conn = (Connection*)root; |
| 111 | int fd = root->socket; |
| 112 | |
| 113 | if (!proxy_select_poll(sel, fd)) |
| 114 | return; |
| 115 | |
| 116 | switch (conn->state) |
| 117 | { |
| 118 | case STATE_CONNECTING: |
| 119 | PROXY_LOG("%s: connected to http proxy, sending header", root->name); |
| 120 | conn->state = STATE_SEND_HEADER; |
| 121 | break; |
| 122 | |
| 123 | case STATE_SEND_HEADER: |
| 124 | ret = proxy_connection_send(root, fd); |
| 125 | if (ret == DATA_COMPLETED) { |
| 126 | conn->state = STATE_RECEIVE_ANSWER_LINE1; |
| 127 | PROXY_LOG("%s: header sent, receiving first answer line", root->name); |
| 128 | } |
| 129 | break; |
| 130 | |
| 131 | case STATE_RECEIVE_ANSWER_LINE1: |
| 132 | case STATE_RECEIVE_ANSWER_LINE2: |
| 133 | ret = proxy_connection_receive_line(root, root->socket); |
| 134 | if (ret == DATA_COMPLETED) { |
| 135 | if (conn->state == STATE_RECEIVE_ANSWER_LINE1) { |
| 136 | int http1, http2, codenum; |
| 137 | const char* line = root->str->s; |
| 138 | |
| 139 | if ( sscanf(line, "HTTP/%d.%d %d", &http1, &http2, &codenum) != 3 ) { |
| 140 | PROXY_LOG( "%s: invalid answer from proxy: '%s'", |
| 141 | root->name, line ); |
| 142 | ret = DATA_ERROR; |
| 143 | break; |
| 144 | } |
| 145 | |
| 146 | /* success is 2xx */ |
| 147 | if (codenum/2 != 100) { |
| 148 | PROXY_LOG( "%s: connection refused, error=%d", |
| 149 | root->name, codenum ); |
| 150 | proxy_connection_free( root, 0, PROXY_EVENT_CONNECTION_REFUSED ); |
| 151 | return; |
| 152 | } |
| 153 | PROXY_LOG("%s: receiving second answer line", root->name); |
| 154 | conn->state = STATE_RECEIVE_ANSWER_LINE2; |
| 155 | proxy_connection_rewind(root); |
| 156 | } else { |
| 157 | /* ok, we're connected */ |
| 158 | PROXY_LOG("%s: connection succeeded", root->name); |
| 159 | proxy_connection_free( root, 1, PROXY_EVENT_CONNECTED ); |
| 160 | } |
| 161 | } |
| 162 | break; |
| 163 | |
| 164 | default: |
| 165 | PROXY_LOG("%s: invalid state for read event: %d", root->name, conn->state); |
| 166 | } |
| 167 | |
| 168 | if (ret == DATA_ERROR) { |
| 169 | proxy_connection_free( root, 0, PROXY_EVENT_SERVER_ERROR ); |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | |
| 174 | |
| 175 | ProxyConnection* |
| 176 | http_connector_connect( HttpService* service, |
| 177 | SockAddress* address ) |
| 178 | { |
| 179 | Connection* conn; |
| 180 | int s; |
| 181 | |
| 182 | s = socket_create_inet( SOCKET_STREAM ); |
| 183 | if (s < 0) |
| 184 | return NULL; |
| 185 | |
| 186 | conn = qemu_mallocz(sizeof(*conn)); |
| 187 | if (conn == NULL) { |
| 188 | socket_close(s); |
| 189 | return NULL; |
| 190 | } |
| 191 | |
| 192 | proxy_connection_init( conn->root, s, address, service->root, |
| 193 | connection_free, |
| 194 | connection_select, |
| 195 | connection_poll ); |
| 196 | |
| 197 | if ( connection_init( conn ) < 0 ) { |
| 198 | connection_free( conn->root ); |
| 199 | return NULL; |
| 200 | } |
| 201 | |
| 202 | return conn->root; |
| 203 | } |