HGKeeper

* libning

* libning is the property of its developers. See the COPYRIGHT file

* for more details.

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

* You should have received a copy of the GNU General Public License

* along with this program. If not, see <http://www.gnu.org/licenses/>.

#include "ning_connection.h"

#include <zlib.h>

static void ning_attempt_connection(NingConnection *);

static gchar *ning_gunzip(const guchar *gzip_data, ssize_t *len_ptr)

{

gsize gzip_data_len = *len_ptr;

z_stream zstr;

int gzip_err = 0;

gchar *data_buffer;

gulong gzip_len = G_MAXUINT16;

GString *output_string = NULL;

data_buffer = g_new0(gchar, gzip_len);

zstr.next_in = NULL;

zstr.avail_in = 0;

zstr.zalloc = Z_NULL;

zstr.zfree = Z_NULL;

zstr.opaque = 0;

gzip_err = inflateInit2(&zstr, MAX_WBITS+32);

if (gzip_err != Z_OK)

{

g_free(data_buffer);

purple_debug_error("ning", "no built-in gzip support in zlib\n");

return NULL;

}

zstr.next_in = (Bytef *)gzip_data;

zstr.avail_in = gzip_data_len;

zstr.next_out = (Bytef *)data_buffer;

zstr.avail_out = gzip_len;

gzip_err = inflate(&zstr, Z_SYNC_FLUSH);

if (gzip_err == Z_DATA_ERROR)

{

inflateEnd(&zstr);

inflateInit2(&zstr, -MAX_WBITS);

if (gzip_err != Z_OK)

{

g_free(data_buffer);

purple_debug_error("ning", "Cannot decode gzip header\n");

return NULL;

}

zstr.next_in = (Bytef *)gzip_data;

zstr.avail_in = gzip_data_len;

zstr.next_out = (Bytef *)data_buffer;

zstr.avail_out = gzip_len;

gzip_err = inflate(&zstr, Z_SYNC_FLUSH);

}

output_string = g_string_new("");

while (gzip_err == Z_OK)

{

//append data to buffer

output_string = g_string_append_len(output_string, data_buffer, gzip_len - zstr.avail_out);

//reset buffer pointer

zstr.next_out = (Bytef *)data_buffer;

zstr.avail_out = gzip_len;

gzip_err = inflate(&zstr, Z_SYNC_FLUSH);

}

if (gzip_err == Z_STREAM_END)

{

output_string = g_string_append_len(output_string, data_buffer, gzip_len - zstr.avail_out);

} else {

purple_debug_error("ning", "gzip inflate error\n");

}

inflateEnd(&zstr);

g_free(data_buffer);

gchar *output_data = g_strdup(output_string->str);

*len_ptr = output_string->len;

g_string_free(output_string, TRUE);

return output_data;

}

void ning_connection_destroy(NingConnection *conn)

{

conn->na->conns = g_slist_remove(conn->na->conns, conn);

if (conn->request != NULL)

g_string_free(conn->request, TRUE);

g_free(conn->rx_buf);

if (conn->connect_data != NULL)

purple_proxy_connect_cancel(conn->connect_data);

if (conn->ssl_conn != NULL)

purple_ssl_close(conn->ssl_conn);

if (conn->fd >= 0) {

close(conn->fd);

}

if (conn->input_watcher > 0)

purple_input_remove(conn->input_watcher);

g_free(conn->hostname);

g_free(conn);

}

static void ning_update_cookies(NingAccount *na, const gchar *headers)

{

const gchar *cookie_start;

const gchar *cookie_end;

gchar *cookie_name;

gchar *cookie_value;

int header_len;

g_return_if_fail(headers != NULL);

header_len = strlen(headers);

/* look for the next "Set-Cookie: " */

/* grab the data up until ';' */

cookie_start = headers;

while ((cookie_start = strstr(cookie_start, "\r\nSet-Cookie: ")) &&

(headers-cookie_start) < header_len)

{

cookie_start += 14;

cookie_end = strchr(cookie_start, '=');

cookie_name = g_strndup(cookie_start, cookie_end-cookie_start);

cookie_start = cookie_end + 1;

cookie_end = strchr(cookie_start, ';');

cookie_value= g_strndup(cookie_start, cookie_end-cookie_start);

cookie_start = cookie_end;

purple_debug_info("ning", "got cookie %s=%s\n",

cookie_name, cookie_value);

g_hash_table_replace(na->cookie_table, cookie_name,

cookie_value);

}

static void ning_connection_process_data(NingConnection *conn)

{

ssize_t len;

gchar *tmp;

len = conn->rx_len;

tmp = g_strstr_len(conn->rx_buf, len, "\r\n\r\n");

if (tmp == NULL) {

/* This is a corner case that occurs when the connection is

* prematurely closed either on the client or the server.

* This can either be no data at all or a partial set of

* headers. We pass along the data to be good, but don't

* do any fancy massaging. In all likelihood the result will

* be tossed by the connection callback func anyways

tmp = g_strndup(conn->rx_buf, len);

} else {

tmp += 4;

len -= g_strstr_len(conn->rx_buf, len, "\r\n\r\n") -

conn->rx_buf + 4;

tmp = g_memdup(tmp, len + 1);

tmp[len] = '\0';

conn->rx_buf[conn->rx_len - len] = '\0';

purple_debug_misc("ning", "response headers\n%s\n",

conn->rx_buf);

ning_update_cookies(conn->na, conn->rx_buf);

if (strstr(conn->rx_buf, "Content-Encoding: gzip"))

{

/* we've received compressed gzip data, decompress */

gchar *gunzipped;

gunzipped = ning_gunzip((const guchar *)tmp, &len);

g_free(tmp);

tmp = gunzipped;

}

g_free(conn->rx_buf);

conn->rx_buf = NULL;

if (conn->callback != NULL)

conn->callback(conn->na, tmp, len, conn->user_data);

g_free(tmp);

}

static void ning_fatal_connection_cb(NingConnection *conn)

{

PurpleConnection *pc = conn->na->pc;

purple_debug_error("ning", "fatal connection error\n");

ning_connection_destroy(conn);

/* We died. Do not pass Go. Do not collect $200 */

/* In all seriousness, don't attempt to call the normal callback here.

* That may lead to the wrong error message being displayed */

purple_connection_error_reason(pc,

PURPLE_CONNECTION_ERROR_NETWORK_ERROR,

_("Server closed the connection."));

}

static void ning_post_or_get_readdata_cb(gpointer data, gint source,

PurpleInputCondition cond)

{

NingConnection *conn;

gchar buf[4096];

ssize_t len;

conn = data;

if (conn->method & NING_METHOD_SSL) {

len = purple_ssl_read(conn->ssl_conn,

buf, sizeof(buf) - 1);

} else {

len = recv(conn->fd, buf, sizeof(buf) - 1, 0);

}

if (len < 0)

{

if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) {

/* Try again later */

return;

}

if (conn->method & NING_METHOD_SSL && conn->rx_len > 0) {

* This is a slightly hacky workaround for a bug in either

* GNU TLS or in the SSL implementation on Facebook's web

* servers. The sequence of events is:

* 1. We attempt to read the first time and successfully read

* the server's response.

* 2. We attempt to read a second time and libpurple's call

* to gnutls_record_recv() returns the error

* GNUTLS_E_UNEXPECTED_PACKET_LENGTH, or

* "A TLS packet with unexpected length was received."

* Normally the server would have closed the connection

* cleanly and this second read() request would have returned

* 0. Or maybe it's normal for SSL connections to be severed

* in this manner? In any case, this differs from the behavior

* of the standard recv() system call.

purple_debug_warning("ning",

"ssl error, but data received. attempting to continue\n");

} else {

/* TODO: Is this a regular occurrence? If so then maybe resend the request? */

ning_fatal_connection_cb(conn);

return;

}

if (len > 0)

{

buf[len] = '\0';

conn->rx_buf = g_realloc(conn->rx_buf,

conn->rx_len + len + 1);

memcpy(conn->rx_buf + conn->rx_len, buf, len + 1);

conn->rx_len += len;

/* Wait for more data before processing */

return;

}

/* The server closed the connection, let's parse the data */

ning_connection_process_data(conn);

ning_connection_destroy(conn);

}

static void ning_post_or_get_ssl_readdata_cb (gpointer data,

PurpleSslConnection *ssl, PurpleInputCondition cond)

{

ning_post_or_get_readdata_cb(data, -1, cond);

}

static void ning_post_or_get_connect_cb(gpointer data, gint source,

const gchar *error_message)

{

NingConnection *conn;

ssize_t len;

conn = data;

conn->connect_data = NULL;

if (error_message)

{

purple_debug_error("ning", "post_or_get_connect_cb %s\n",

error_message);

ning_fatal_connection_cb(conn);

return;

}

purple_debug_info("ning", "post_or_get_connect_cb\n");

conn->fd = source;

/* TODO: Check the return value of write() */

len = write(conn->fd, conn->request->str,

conn->request->len);

conn->input_watcher = purple_input_add(conn->fd,

PURPLE_INPUT_READ,

ning_post_or_get_readdata_cb, conn);

}

static void ning_post_or_get_ssl_connect_cb(gpointer data,

PurpleSslConnection *ssl, PurpleInputCondition cond)

{

NingConnection *conn;

ssize_t len;

conn = data;

purple_debug_info("ning", "post_or_get_ssl_connect_cb\n");

/* TODO: Check the return value of write() */

len = purple_ssl_write(conn->ssl_conn,

conn->request->str, conn->request->len);

purple_ssl_input_add(conn->ssl_conn,

ning_post_or_get_ssl_readdata_cb, conn);

}

static void ning_host_lookup_cb(GSList *hosts, gpointer data,

const char *error_message)

{

GSList *host_lookup_list;

struct sockaddr_in *addr;

gchar *hostname;

gchar *ip_address;

NingAccount *na;

PurpleDnsQueryData *query;

purple_debug_info("ning", "updating cache of dns addresses\n");

/* Extract variables */

host_lookup_list = data;

na = host_lookup_list->data;

host_lookup_list =

g_slist_delete_link(host_lookup_list, host_lookup_list);

hostname = host_lookup_list->data;

host_lookup_list =

g_slist_delete_link(host_lookup_list, host_lookup_list);

query = host_lookup_list->data;

host_lookup_list =

g_slist_delete_link(host_lookup_list, host_lookup_list);

/* The callback has executed, so we no longer need to keep track of

* the original query. This always needs to run when the cb is

* executed. */

na->dns_queries = g_slist_remove(na->dns_queries, query);

/* Any problems, capt'n? */

if (error_message != NULL)

{

purple_debug_warning("ning",

"Error doing host lookup: %s\n", error_message);

return;

}

if (hosts == NULL)

{

purple_debug_warning("ning",

"Could not resolve host name\n");

return;

}

/* Discard the length... */

hosts = g_slist_delete_link(hosts, hosts);

/* Copy the address then free it... */

addr = hosts->data;

ip_address = g_strdup(inet_ntoa(addr->sin_addr));

g_free(addr);

hosts = g_slist_delete_link(hosts, hosts);

* DNS lookups can return a list of IP addresses, but we only cache

* the first one. So free the rest.

while (hosts != NULL)

{

/* Discard the length... */

hosts = g_slist_delete_link(hosts, hosts);

/* Free the address... */

g_free(hosts->data);

hosts = g_slist_delete_link(hosts, hosts);

}

purple_debug_info("ning", "Host %s has IP %s\n",

hostname, ip_address);

g_hash_table_insert(na->hostname_ip_cache, hostname, ip_address);

}

static void ning_cookie_foreach_cb(gchar *cookie_name,

gchar *cookie_value, GString *str)

{

/* TODO: Need to escape name and value? */

g_string_append_printf(str, "%s=%s;", cookie_name, cookie_value);

}

static gchar *ning_cookies_to_string(NingAccount *na)

{

GString *str;

str = g_string_new(NULL);

g_hash_table_foreach(na->cookie_table,

(GHFunc)ning_cookie_foreach_cb, str);

return g_string_free(str, FALSE);

}

static void ning_ssl_connection_error(PurpleSslConnection *ssl,

PurpleSslErrorType errortype, gpointer data)

{

NingConnection *conn = data;

PurpleConnection *pc = conn->na->pc;

conn->ssl_conn = NULL;

ning_connection_destroy(conn);

purple_connection_ssl_error(pc, errortype);

}

void ning_post_or_get(NingAccount *na, NingMethod method,

const gchar *host, const gchar *url, const gchar *postdata,

NingProxyCallbackFunc callback_func, gpointer user_data,

gboolean keepalive)

{

GString *request;

gchar *cookies;

NingConnection *conn;

gchar *real_url;

gboolean is_proxy = FALSE;

const gchar *user_agent;

const gchar* const *languages;

gchar *language_names;

PurpleProxyInfo *proxy_info = NULL;

gchar *proxy_auth;

gchar *proxy_auth_base64;

purple_debug_info("ning", "post_or_get\n");

/* TODO: Fix keepalive and use it as much as possible */

keepalive = FALSE;

if (host == NULL)

{

purple_debug_error("ning", "no host specified\n");

return;

}

if (na && na->account && !(method & NING_METHOD_SSL))

{

proxy_info = purple_proxy_get_setup(na->account);

if (purple_proxy_info_get_type(proxy_info) == PURPLE_PROXY_USE_GLOBAL)

proxy_info = purple_global_proxy_get_info();

if (purple_proxy_info_get_type(proxy_info) == PURPLE_PROXY_HTTP)

{

is_proxy = TRUE;

}

if (is_proxy == TRUE)

{

real_url = g_strdup_printf("http://%s%s", host, url);

} else {

real_url = g_strdup(url);

}

cookies = ning_cookies_to_string(na);

user_agent = purple_account_get_string(na->account, "user-agent", "Opera/9.50 (Windows NT 5.1; U; en-GB)");

if (method & NING_METHOD_POST && !postdata)

postdata = "";

/* Build the request */

request = g_string_new(NULL);

g_string_append_printf(request, "%s %s HTTP/1.0\r\n",

(method & NING_METHOD_POST) ? "POST" : "GET",

real_url);

if (is_proxy == FALSE)

g_string_append_printf(request, "Host: %s\r\n", host);

g_string_append_printf(request, "Connection: %s\r\n",

(keepalive ? "Keep-Alive" : "close"));

g_string_append_printf(request, "User-Agent: %s\r\n", user_agent);

if (method & NING_METHOD_POST) {

g_string_append_printf(request,

"Content-Type: application/x-www-form-urlencoded\r\n");

g_string_append_printf(request,

"Content-length: %zu\r\n", strlen(postdata));

}

g_string_append_printf(request, "Accept: */*\r\n");

g_string_append_printf(request, "Cookie: %s\r\n", cookies);

g_string_append_printf(request, "Accept-Encoding: gzip\r\n");

if (is_proxy == TRUE)

{

if (purple_proxy_info_get_username(proxy_info) &&

purple_proxy_info_get_password(proxy_info))

{

proxy_auth = g_strdup_printf("%s:%s", purple_proxy_info_get_username(proxy_info), purple_proxy_info_get_password(proxy_info));

proxy_auth_base64 = purple_base64_encode((guchar *)proxy_auth, strlen(proxy_auth));

g_string_append_printf(request, "Proxy-Authorization: Basic %s\r\n", proxy_auth_base64);

g_free(proxy_auth_base64);

g_free(proxy_auth);

}

/* Tell the server what language we accept, so that we get error messages in our language (rather than our IP's) */

languages = g_get_language_names();

language_names = g_strjoinv(", ", (gchar **)languages);

purple_util_chrreplace(language_names, '_', '-');

g_string_append_printf(request, "Accept-Language: %s\r\n", language_names);

g_free(language_names);

purple_debug_misc("ning", "sending request headers:\n%s\n",

request->str);

g_string_append_printf(request, "\r\n");

if (method & NING_METHOD_POST)

g_string_append_printf(request, "%s", postdata);

/* If it needs to go over a SSL connection, we probably shouldn't print

* it in the debug log. Without this condition a user's password is

* printed in the debug log */

if (method == NING_METHOD_POST)

purple_debug_misc("ning", "sending request data:\n%s\n",

postdata);

g_free(cookies);

g_free(real_url);

* Do a separate DNS lookup for the given host name and cache it

* for next time.

* TODO: It would be better if we did this before we call

* purple_proxy_connect(), so we could re-use the result.

* Or even better: Use persistent HTTP connections for servers

* that we access continually.

* TODO: This cache of the hostname<-->IP address does not respect

* the TTL returned by the DNS server. We should expire things

* from the cache after some amount of time.

if (!is_proxy)

{

/* Don't do this for proxy connections, since proxies do the DNS lookup */

gchar *host_ip;

host_ip = g_hash_table_lookup(na->hostname_ip_cache, host);

if (host_ip != NULL) {

purple_debug_info("ning",

"swapping original host %s with cached value of %s\n",

host, host_ip);

host = host_ip;

} else if (na->account && !na->account->disconnecting) {

GSList *host_lookup_list = NULL;

PurpleDnsQueryData *query;

host_lookup_list = g_slist_prepend(

host_lookup_list, g_strdup(host));

host_lookup_list = g_slist_prepend(

host_lookup_list, na);

query = purple_dnsquery_a(host, 80,

ning_host_lookup_cb, host_lookup_list);

na->dns_queries = g_slist_prepend(na->dns_queries, query);

host_lookup_list = g_slist_append(host_lookup_list, query);

}

conn = g_new0(NingConnection, 1);

conn->na = na;

conn->method = method;

conn->hostname = g_strdup(host);

conn->request = request;

conn->callback = callback_func;

conn->user_data = user_data;

conn->fd = -1;

conn->connection_keepalive = keepalive;

conn->request_time = time(NULL);

na->conns = g_slist_prepend(na->conns, conn);

ning_attempt_connection(conn);

}

static void ning_attempt_connection(NingConnection *conn)

{

NingAccount *na = conn->na;

if (conn->method & NING_METHOD_SSL) {

conn->ssl_conn = purple_ssl_connect(na->account, conn->hostname,

443, ning_post_or_get_ssl_connect_cb,

ning_ssl_connection_error, conn);

} else {

conn->connect_data = purple_proxy_connect(NULL, na->account,

conn->hostname, 80, ning_post_or_get_connect_cb, conn);

}

return;

}

pidgin/purple-plugin-pack