/**
* initialize config and allocate buffers
*
* @return -1 if an error occured
* @return 0 on success
*/
int proxenet_init_config(int argc, char** argv)
{
cfg = ¤t_config;
proxenet_xzero(cfg, sizeof(conf_t));
if (parse_options(argc, argv) < 0) {
xlog(LOG_CRITICAL, "%s\n", "Failed to parse arguments");
proxenet_free_config();
proxenet_xzero(cfg, sizeof(conf_t));
return -1;
}
return 0;
}
sock_t proxenet_bind_control_socket()
{
sock_t control_sock = -1;
struct sockaddr_un sun_local;
proxenet_xzero(&sun_local, sizeof(struct sockaddr_un));
/* create control socket */
control_sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (control_sock < 0) {
return -1;
}
sun_local.sun_family = AF_UNIX;
strcpy(sun_local.sun_path, CFG_CONTROL_SOCK_PATH);
unlink(sun_local.sun_path);
/* and bind+listen */
if ( (bind(control_sock, (struct sockaddr *)&sun_local, SUN_LEN(&sun_local)) < 0) ||
(listen(control_sock, 1) < 0 ) ) {
close(control_sock);
return -1;
}
xlog(LOG_INFO, "Control interface listening on '%s'\n", sun_local.sun_path);
return control_sock;
}
/**
* Prints a few information about the proxenet session.
*/
static void print_global_stats()
{
struct tm *t1, *t2;
char buf[128];
float bytes_sent_kb, bytes_sent_mb;
float bytes_recv_kb, bytes_recv_mb;
t1 = localtime(&start_time);
t2 = localtime(&end_time);
xlog(LOG_INFO, "%s\n", "Statistics:");
proxenet_xzero(buf, sizeof(buf));
strftime(buf, sizeof(buf), "%F %T", t1);
xlog(LOG_INFO, "Start time: %s\n", buf);
proxenet_xzero(buf, sizeof(buf));
strftime(buf, sizeof(buf), "%F %T", t2);
xlog(LOG_INFO, "End time: %s\n", buf);
xlog(LOG_INFO, "Session duration: %lu seconds\n", (end_time-start_time));
bytes_sent_kb = bytes_sent/1024.0;
bytes_sent_mb = bytes_sent_kb/1024.0;
xlog(LOG_INFO, "Number of bytes sent: %luB (%.2fkB, %.2fMB)\n",
bytes_sent, bytes_sent_kb, bytes_sent_mb);
bytes_recv_kb = bytes_recv/1024.0;
bytes_recv_mb = bytes_recv_kb/1024.0;
xlog(LOG_INFO, "Number of bytes received: %luB (%.2fkB, %5.2fMB)\n",
bytes_recv,bytes_recv_kb, bytes_recv_mb);
xlog(LOG_INFO, "Number of unique requests: %lu\n", (request_id-1));
return;
}
void initialize_sigmask(struct sigaction *saction)
{
proxenet_xzero(saction, sizeof(struct sigaction));
saction->sa_handler = sighandler;
saction->sa_flags = SA_RESTART|SA_NOCLDSTOP;
sigemptyset(&(saction->sa_mask));
sigaction(SIGINT, saction, NULL);
sigaction(SIGTERM, saction, NULL);
sigaction(SIGCHLD, saction, NULL);
saction->sa_handler = SIG_IGN;
sigaction(SIGPIPE, saction, NULL);
return;
}
/**
* malloc(3) wrapper. Checks size and zero-fill buffer.
*
* Note: (re-)allocation is a "succeed-or-die" process in proxenet.
*
* @param size: buffer size to allocate on heap
* @return ptr: allocated zero-filled buffer pointer
*/
void* proxenet_xmalloc(size_t size)
{
void *ptr;
if (size > SIZE_MAX / sizeof(size_t)) {
xlog(LOG_CRITICAL, "proxenet_xmalloc: try to allocate incorrect size (%d byte)\n", size);
abort();
}
ptr = malloc(size);
if ( ptr == NULL ) {
xlog(LOG_CRITICAL, "%s\n", "proxenet_xmalloc: fail to allocate space");
abort();
}
proxenet_xzero(ptr, size);
return ptr;
}
void help_cmd(sock_t fd, char *options, unsigned int nb_options)
{
struct command_t *cmd;
char *msg;
unsigned int msglen = 20 + 80 + 3;
msg = "Command list:\n";
proxenet_write(fd, (void*)msg, strlen(msg));
for (cmd=known_commands; cmd && cmd->name; cmd++) {
msg = alloca(msglen+1);
proxenet_xzero(msg, msglen+1);
snprintf(msg, msglen+1, "%-15s\t%s\n", cmd->name, cmd->desc);
proxenet_write(fd, (void*)msg, strlen(msg));
}
return;
}
static int proxenet_perl_load_file(plugin_t* plugin)
{
char *pathname = NULL;
size_t pathlen = 0;
SV* sv = NULL;
int nb_res = -1;
SV* package_sv = NULL;
char *required = NULL;
char *package_name = NULL;
size_t package_len, len = 0;
int ret = -1;
pathlen = strlen(cfg->plugins_path) + 1 + strlen(plugin->filename) + 1;
pathname = (char*) alloca(pathlen+1);
proxenet_xzero(pathname, pathlen+1);
snprintf(pathname, pathlen, "%s/%s", cfg->plugins_path, plugin->filename);
#ifdef DEBUG
xlog(LOG_DEBUG, "[Perl] Loading '%s'\n", pathname);
#endif
/* Load the file through perl's require mechanism */
dSP;
ENTER;
SAVETMPS;
PUSHMARK(SP);
PUTBACK;
sv = newSVpvf("$package = require q%c%s%c", 0, pathname, 0);
nb_res = eval_sv(sv_2mortal(sv), G_EVAL);
if (nb_res != 1) {
xlog(LOG_ERROR,
"[Perl] Invalid number of response returned while loading '%s' (got %d, expected 1)\n",
pathname,
nb_res);
} else if (SvTRUE(ERRSV)) {
xlog(LOG_ERROR, "[Perl] Eval error for '%s': %s\n", pathname, SvPV_nolen(ERRSV));
} else {
/* Get the package name from the package (which should follow the convention...) */
package_sv = get_sv("package", 0);
/* Check if the SV* stores a string */
if (!SvPOK(package_sv)) {
xlog(LOG_ERROR, "[Perl] Invalid convention for '%s': the package should return a string\n", pathname);
} else {
required = (char*) SvPV_nolen(package_sv);
package_len = strlen(required);
package_name = (char*) alloca(package_len+1);
proxenet_xzero(package_name, package_len+1);
memcpy(package_name, required, package_len);
#ifdef DEBUG
xlog(LOG_DEBUG, "[Perl] Package of name '%s' loaded\n", package_name);
#endif
/* Save the functions' full name to call them later */
len = package_len + 2 + strlen(CFG_REQUEST_PLUGIN_FUNCTION);
plugin->pre_function = proxenet_xmalloc(len + 1);
snprintf(plugin->pre_function, len+1, "%s::%s", package_name, CFG_REQUEST_PLUGIN_FUNCTION);
len = package_len + 2 + strlen(CFG_RESPONSE_PLUGIN_FUNCTION);
plugin->post_function = proxenet_xmalloc(len + 1);
snprintf(plugin->post_function, len+1, "%s::%s", package_name, CFG_RESPONSE_PLUGIN_FUNCTION);
ret = 0;
}
}
SPAGAIN;
PUTBACK;
FREETMPS;
LEAVE;
return ret;
}
/**
* Clean heap allocated block, and free it.
*
* @param buf : buffer to zero-ize
* @param buflen : buf length
*/
void proxenet_xclean(void* buf, size_t buflen)
{
proxenet_xzero(buf, buflen);
proxenet_xfree(buf);
return;
}
int create_http_socket(char* http_request, sock_t* server_sock, sock_t* client_sock, ssl_context_t* ssl_ctx)
{
http_request_t http_infos;
int retcode;
char* err;
char sport[7] = {0, };
err = NULL;
proxenet_xzero(&http_infos, sizeof(http_request_t));
http_infos.method = NULL;
http_infos.hostname = NULL;
http_infos.request_uri = NULL;
/* get target from string and establish client socket to dest */
if (get_url_information(http_request, &http_infos) == false) {
xlog(LOG_ERROR, "%s\n", "Failed to extract valid parameters from URL.");
return -1;
}
ssl_ctx->use_ssl = http_infos.is_ssl;
snprintf(sport, 6, "%d", http_infos.port);
retcode = create_connect_socket(http_infos.hostname, sport, &err);
if (retcode < 0) {
if (err)
generic_http_error_page(*server_sock, err);
else
generic_http_error_page(*server_sock, "Unknown error in <i>create_connect_socket</i>");
retcode = -1;
} else {
*client_sock = retcode;
/* if ssl, set up ssl interception */
if (http_infos.is_ssl) {
/* 1. set up proxy->server ssl session */
if(proxenet_ssl_init_client_context(&(ssl_ctx->client)) < 0) {
retcode = -1;
goto http_sock_end;
}
proxenet_ssl_wrap_socket(&(ssl_ctx->client.context), client_sock);
if (proxenet_ssl_handshake(&(ssl_ctx->client.context)) < 0) {
xlog(LOG_ERROR, "%s\n", "proxy->server: handshake");
retcode = -1;
goto http_sock_end;
}
#ifdef DEBUG
xlog(LOG_DEBUG, "%s\n", "SSL handshake with server done");
#endif
proxenet_write(*server_sock,
"HTTP/1.0 200 Connection established\r\n\r\n",
39);
/* 2.set up proxy->browser ssl session */
if(proxenet_ssl_init_server_context(&(ssl_ctx->server)) < 0) {
retcode = -1;
goto http_sock_end;
}
proxenet_ssl_wrap_socket(&(ssl_ctx->server.context), server_sock);
if (proxenet_ssl_handshake(&(ssl_ctx->server.context)) < 0) {
xlog(LOG_ERROR, "handshake proxy->client '%s:%d' failed\n",
http_infos.hostname, http_infos.port);
retcode = -1;
goto http_sock_end;
}
#ifdef DEBUG
xlog(LOG_DEBUG, "%s\n", "SSL Handshake with client done");
#endif
}
}
http_sock_end:
proxenet_xfree(http_infos.method);
proxenet_xfree(http_infos.hostname);
proxenet_xfree(http_infos.request_uri);
return retcode;
}
void xloop(sock_t sock, sock_t ctl_sock)
{
fd_set sock_set;
int retcode;
pthread_attr_t pattr;
int tid;
sock_t conn;
sigset_t curmask, oldmask;
sock_t ctl_cli_sock = -1;
/* prepare threads */
proxenet_xzero(threads, sizeof(pthread_t) * MAX_THREADS);
if (pthread_attr_init(&pattr)) {
xlog(LOG_ERROR, "%s\n", "Failed to pthread_attr_init");
return;
}
pthread_attr_setdetachstate(&pattr, PTHREAD_CREATE_JOINABLE);
/* block useful signal */
sigemptyset(&curmask);
sigaddset(&curmask, SIGTERM);
sigaddset(&curmask, SIGINT);
sigaddset(&curmask, SIGCHLD);
if (pthread_sigmask(SIG_BLOCK, &curmask, &oldmask) < 0) {
xlog(LOG_ERROR, "sigprocmask failed : %s\n", strerror(errno));
return;
}
/* proxenet is now running :) */
proxy_state = ACTIVE;
/* big loop */
while (proxy_state != INACTIVE) {
conn = -1;
retcode = -1;
FD_ZERO(&sock_set);
FD_SET(sock, &sock_set);
FD_SET(ctl_sock, &sock_set);
if (ctl_cli_sock > 0)
FD_SET(ctl_cli_sock, &sock_set);
purge_zombies();
/* set asynchronous listener */
struct timespec timeout = {
.tv_sec = 5,
.tv_nsec = 0
};
retcode = pselect(FD_SETSIZE, &sock_set, NULL, NULL, &timeout, &oldmask);
if (retcode < 0) {
if (errno != EINTR) {
xlog(LOG_ERROR, "[main] pselect() returned %d: %s\n", retcode, strerror(errno));
proxy_state = INACTIVE;
break;
} else {
continue;
}
}
if (retcode == 0)
continue;
if (proxy_state == INACTIVE)
break;
/* event on the listening socket -> new request */
if( FD_ISSET(sock, &sock_set) && proxy_state != SLEEPING) {
#ifdef DEBUG
xlog(LOG_DEBUG, "%s\n", "Incoming listening event");
#endif
tid = get_new_thread_id();
if(tid < 0) {
continue;
}
struct sockaddr addr;
socklen_t addrlen = 0;
proxenet_xzero(&addr, sizeof(struct sockaddr));
conn = accept(sock, &addr, &addrlen);
if (conn < 0) {
if(errno != EINTR)
xlog(LOG_ERROR, "[main] accept() failed: %s\n", strerror(errno));
continue;
}
retcode = proxenet_start_new_thread(conn, tid, &threads[tid], &pattr);
if (retcode < 0) {
xlog(LOG_ERROR, "[main] %s\n", "Error while spawn new thread");
continue;
}
} /* end if _socket_event */
/* event on control listening socket */
if( FD_ISSET(ctl_sock, &sock_set) ) {
#ifdef DEBUG
xlog(LOG_DEBUG, "%s\n", "Incoming control event");
#endif
struct sockaddr_un sun_cli;
socklen_t sun_cli_len = 0;
int new_conn = -1;
proxenet_xzero(&sun_cli, sizeof(struct sockaddr_un));
new_conn = accept(ctl_sock, (struct sockaddr *)&sun_cli, &sun_cli_len);
if (new_conn < 0) {
xlog(LOG_ERROR, "[main] control accept() failed: %s\n", strerror(errno));
continue;
}
if (ctl_cli_sock < 0) {
ctl_cli_sock = new_conn;
xlog(LOG_INFO, "%s\n", "New connection on Control socket");
proxenet_write(ctl_cli_sock, CONTROL_MOTD, strlen(CONTROL_MOTD));
proxenet_write(ctl_cli_sock, CONTROL_PROMPT, strlen(CONTROL_PROMPT));
} else {
if(new_conn > 0) {
xlog(LOG_ERROR, "%s\n", "Denied control connection: already established");
if(close_socket(new_conn) < 0) {
xlog(LOG_ERROR, "Failed to close socket: %s\n", strerror(errno));
}
}
}
}/* end if _control_listening_event */
/* event on control socket */
if( ctl_cli_sock > 0 && FD_ISSET(ctl_cli_sock, &sock_set) ) {
if (proxenet_handle_control_event(&ctl_cli_sock) < 0) {
close_socket(ctl_cli_sock);
ctl_cli_sock = -1;
}
} /* end if _control_event */
} /* endof while(!INACTIVE) */
kill_zombies();
proxenet_destroy_plugins_vm();
pthread_attr_destroy(&pattr);
return;
}
/**
*
* @param signum
*/
void sighandler(int signum)
{
#ifdef DEBUG
xlog(LOG_DEBUG, "Received signal %s [%d]\n", strsignal(signum), signum);
#endif
switch(signum) {
case SIGTERM:
case SIGINT:
if (proxy_state != INACTIVE)
proxy_state = INACTIVE;
cfg->try_exit++;
xlog(LOG_INFO, "%s, %d/%d\n", "Trying to leave", cfg->try_exit, cfg->try_exit_max);
if (cfg->try_exit == cfg->try_exit_max) {
xlog(LOG_CRITICAL, "%s\n", "Failed to exit properly");
abort();
}
break;
case SIGCHLD:
purge_zombies();
break;
}
}
/**
* This function is called by all threads to treat to process the request and response.
* It will also apply the plugins.
*/
void proxenet_process_http_request(sock_t server_socket)
{
sock_t client_socket;
request_t req;
int retcode;
fd_set rfds;
struct timespec ts;
ssl_context_t ssl_context;
bool is_ssl;
sigset_t emptyset;
size_t n;
client_socket = retcode = n = -1;
proxenet_xzero(&req, sizeof(request_t));
proxenet_xzero(&ssl_context, sizeof(ssl_context_t));
/* wait for any event on sockets */
for(;;) {
if (server_socket < 0) {
xlog(LOG_ERROR, "%s\n", "Sock browser->proxy died unexpectedly");
break;
}
ts.tv_sec = HTTP_TIMEOUT_SOCK;
ts.tv_nsec = 0;
FD_ZERO(&rfds);
FD_SET(server_socket, &rfds);
if (client_socket > 0)
FD_SET(client_socket, &rfds);
sigemptyset(&emptyset);
retcode = pselect(FD_SETSIZE, &rfds, NULL, NULL, &ts, &emptyset);
if (retcode < 0) {
if (errno == EINTR) {
continue;
} else {
xlog(LOG_CRITICAL, "[thread] pselect returned %d: %s\n", retcode, strerror(errno));
break;
}
}
if (retcode == 0) {
break;
}
is_ssl = ssl_context.use_ssl;
/* is there data from web browser to proxy ? */
if( FD_ISSET(server_socket, &rfds ) ) {
n = - 1;
if(is_ssl) {
n = proxenet_read_all(server_socket,
&req.data,
&(ssl_context.server.context));
} else {
n = proxenet_read_all(server_socket, &req.data, NULL);
}
#ifdef DEBUG
xlog(LOG_DEBUG, "[%d] Got %dB from client (%s)\n", req.id, n, (is_ssl)?"SSL":"PLAIN");
#endif
if (n <= 0)
break;
req.size = n;
/* is connection to server not established ? -> new request */
if (client_socket < 0) {
retcode = create_http_socket(&req, &server_socket, &client_socket, &ssl_context);
if (retcode < 0) {
xlog(LOG_ERROR, "[%d] Failed to create %s->server socket\n", req.id, PROGNAME);
proxenet_xfree(req.data);
client_socket = -1;
break;
}
if (ssl_context.use_ssl) {
if (ssl_context.server.is_valid && ssl_context.client.is_valid) {
#ifdef DEBUG
xlog(LOG_DEBUG, "[%d] SSL interception established\n", req.id);
#endif
proxenet_xfree(req.data);
continue;
}
xlog(LOG_ERROR, "[%d] Failed to establish interception\n", req.id);
proxenet_xfree(req.data);
client_socket = -1;
break;
}
}
req.type = REQUEST;
req.id = get_new_request_id();
/* check if request is valid */
if (!cfg->proxy.host) {
if (!is_ssl) {
if (!is_valid_http_request(&req.data, &req.size)) {
proxenet_xfree(req.data);
client_socket = -1;
break;
}
} else {
set_https_infos(&req);
}
}
if (cfg->verbose) {
xlog(LOG_INFO, "New request %d to '%s:%d'\n",
req.id,
req.http_infos.hostname,
req.http_infos.port);
if (cfg->verbose > 1)
xlog(LOG_INFO, "%s %s://%s:%d%s %s\n",
req.http_infos.method,
req.http_infos.proto,
req.http_infos.hostname,
req.http_infos.port,
req.http_infos.uri,
req.http_infos.version);
}
#ifdef DEBUG
xlog(LOG_DEBUG, "[%d] Sending buffer %d bytes (%s) - pre-plugins\n",
req.id, req.size, (req.http_infos.is_ssl)?"SSL":"PLAIN");
#endif
/* hook request with all plugins in plugins_list */
if ( proxenet_apply_plugins(&req) < 0) {
/* extremist action: any error on any plugin discard the whole request */
req.id = 0;
proxenet_xfree( req.data );
continue;
}
#ifdef DEBUG
xlog(LOG_DEBUG, "[%d] Sending buffer %d bytes (%s) - post-plugins\n",
req.id, req.size, (req.http_infos.is_ssl)?"SSL":"PLAIN");
#endif
/* send modified data */
if (is_ssl) {
retcode = proxenet_ssl_write(client_socket, req.data, req.size,
&(ssl_context.client.context));
} else {
retcode = proxenet_write(client_socket, req.data, req.size);
}
proxenet_xfree(req.data);
if (retcode < 0) {
xlog(LOG_ERROR, "[%d] %s\n", req.id, "Failed to write to server");
if (req.id)
req.id = 0;
break;
}
} /* end FD_ISSET(data_from_browser) */
/* is there data from remote server to proxy ? */
if( client_socket > 0 && FD_ISSET(client_socket, &rfds ) ) {
n = -1;
if (is_ssl)
n = proxenet_read_all(client_socket, &req.data, &ssl_context.client.context);
else
n = proxenet_read_all(client_socket, &req.data, NULL);
#ifdef DEBUG
xlog(LOG_DEBUG, "[%d] Got %dB from server\n", req.id, n);
#endif
if (n <= 0)
break;
/* update request data structure */
req.type = RESPONSE;
req.size = n;
/* execute response hooks */
if ( proxenet_apply_plugins(&req) < 0) {
/* extremist action: any error on any plugin discard the whole request */
req.id = 0;
proxenet_xfree(req.data);
continue;
}
/* send modified data to client */
if (is_ssl)
retcode = proxenet_ssl_write(server_socket, req.data, req.size, &ssl_context.server.context);
else
retcode = proxenet_write(server_socket, req.data, req.size);
if (retcode < 0) {
xlog(LOG_ERROR, "[%d] %s\n", req.id, "proxy->client: write failed");
}
proxenet_xfree(req.data);
} /* end FD_ISSET(data_from_server) */
} /* end for(;;) { select() } */
if (req.id) {
#ifdef DEBUG
xlog(LOG_DEBUG, "Free-ing request %d\n", req.id);
#endif
proxenet_xfree(req.http_infos.method);
proxenet_xfree(req.http_infos.hostname);
proxenet_xfree(req.http_infos.uri);
proxenet_xfree(req.http_infos.version);
}
/* close client socket */
if (client_socket > 0) {
#ifdef DEBUG
xlog(LOG_DEBUG, "Closing proxy->server socket #%d\n", client_socket);
#endif
if (ssl_context.client.is_valid) {
proxenet_ssl_finish(&(ssl_context.client), false);
close_socket_ssl(client_socket, &ssl_context.client.context);
} else {
close_socket(client_socket);
}
}
/* close local socket */
if (server_socket > 0) {
#ifdef DEBUG
xlog(LOG_DEBUG, "Closing browser->proxy socket #%d\n", server_socket);
#endif
if (ssl_context.server.is_valid) {
proxenet_ssl_finish(&(ssl_context.server), true);
close_socket_ssl(server_socket, &ssl_context.server.context);
} else {
close_socket(server_socket);
}
}
/* and that's all folks */
return;
}
/**
* This function is called by all threads to treat to process the request and response.
* It will also apply the plugins.
*
* @param server_socket is the socket received by the main thread from the web browser (acting like server
* to web browser)
*/
void proxenet_process_http_request(sock_t server_socket)
{
sock_t client_socket;
request_t req;
int retcode, n;
fd_set rfds;
struct timespec ts;
ssl_context_t ssl_context;
bool is_ssl;
sigset_t emptyset;
bool is_new_http_connection = false;
client_socket = retcode = n = -1;
proxenet_xzero(&req, sizeof(request_t));
proxenet_xzero(&ssl_context, sizeof(ssl_context_t));
/* wait for any event on sockets */
while(proxy_state == ACTIVE) {
if (server_socket < 0) {
xlog(LOG_ERROR, "sock browser->%s (#%d) died unexpectedly\n", PROGNAME, server_socket);
break;
}
ts.tv_sec = HTTP_TIMEOUT_SOCK;
ts.tv_nsec = 0;
FD_ZERO(&rfds);
FD_SET(server_socket, &rfds);
if (client_socket > 0)
FD_SET(client_socket, &rfds);
sigemptyset(&emptyset);
retcode = pselect(FD_SETSIZE, &rfds, NULL, NULL, &ts, &emptyset);
if (retcode < 0) {
if (errno == EINTR) {
continue;
} else {
xlog(LOG_CRITICAL, "[thread] pselect returned %d: %s\n", retcode, strerror(errno));
break;
}
}
if (retcode == 0) {
continue;
}
is_ssl = ssl_context.use_ssl;
/* is there data from web browser to proxy ? */
if( FD_ISSET(server_socket, &rfds ) ) {
if(is_ssl && req.do_intercept) {
n = proxenet_read_all(server_socket,
&req.data,
&(ssl_context.server.context));
} else {
n = proxenet_read_all(server_socket, &req.data, NULL);
}
#ifdef DEBUG
xlog(LOG_DEBUG, "Got %dB from client (%s srv_sock=#%d intercept_flag=%s)\n",
n, is_ssl?"SSL":"PLAIN", server_socket,
req.do_intercept?"true":"false");
#endif
if (n < 0) {
xlog(LOG_ERROR, "%s\n", "read() failed, end thread");
break;
}
if (n == 0){
#ifdef DEBUG
xlog(LOG_DEBUG, "%s\n", "Socket EOF from client");
#endif
break;
}
/* from here, n can only be positive */
req.size = (size_t) n;
bytes_sent += n;
if (req.id > 0 && !req.do_intercept){
#ifdef DEBUG
xlog(LOG_DEBUG, "Intercept disabled for browser->'%s'\n", req.http_infos.hostname);
#endif
goto send_to_server;
}
/* proxy keep-alive */
if (req.id > 0){
request_t* old_req = (request_t*)proxenet_xmalloc(sizeof(request_t));
memcpy(old_req, &req, sizeof(request_t));
char* host = proxenet_xstrdup2( req.http_infos.hostname );
free_http_infos(&(req.http_infos));
if (update_http_infos(&req) < 0){
xlog(LOG_ERROR, "Failed to update HTTP information for request %d\n", req.id);
proxenet_xfree( host );
proxenet_xfree( old_req );
req.id = 0;
break;
}
if (strcmp( host, req.http_infos.hostname )){
/* reset the client connection parameters */
if (cfg->verbose)
xlog(LOG_INFO, "Reusing sock=%d (old request=%d, old sock=%d) %s/%s\n",
server_socket, req.id, client_socket, host, req.http_infos.hostname );
proxenet_close_socket(client_socket, &(ssl_context.client));
free_http_infos(&(req.http_infos));
client_socket = -1;
}
proxenet_xclean( old_req, sizeof(request_t) );
proxenet_xfree( host );
}
req.type = REQUEST;
req.id = get_new_request_id();
/* is connection to server not established ? -> new request */
if ( client_socket < 0) {
retcode = create_http_socket(&req, &server_socket, &client_socket, &ssl_context);
if (retcode < 0) {
xlog(LOG_ERROR, "Failed to create %s->server socket\n", PROGNAME);
proxenet_xfree(req.data);
req.id = 0;
break;
}
if (ssl_context.use_ssl) {
req.is_ssl = true;
if (req.do_intercept == false) {
#ifdef DEBUG
xlog(LOG_DEBUG, "SSL interception client <-> %s <-> server disabled\n", PROGNAME);
#endif
proxenet_xfree(req.data);
req.type = REQUEST;
req.id = get_new_request_id();
continue;
} else if (ssl_context.server.is_valid && ssl_context.client.is_valid) {
#ifdef DEBUG
xlog(LOG_DEBUG, "SSL interception client <-> %s <-> server established\n", PROGNAME);
#endif
proxenet_xfree(req.data);
is_new_http_connection = true;
continue;
}
xlog(LOG_ERROR, "%s\n", "Failed to establish interception");
proxenet_xfree(req.data);
break;
}
is_new_http_connection = true;
}
/* if proxenet does not relay to another proxy */
if (!cfg->proxy.host) {
if (is_new_http_connection) {
if (is_ssl) {
/*
* SSL request fields still have the values gathered in the CONNECT
* Those values must be updated to reflect the real request
*/
free_http_infos(&(req.http_infos));
retcode = update_http_infos(&req);
} else {
/*
* Format requests
* GET http://foo/bar.blah HTTP/1.1 ...
* into
* GET /bar.blah HTTP/1.1 ...
*/
retcode = format_http_request(&req.data, &req.size);
}
} else {
/* if here, at least 1 request has been to server */
/* so simply forward */
/* e.g. using HTTP/1.1 100 Continue */
#ifdef DEBUG
xlog(LOG_DEBUG, "Resuming stream '%d'->'%d'\n", client_socket, server_socket);
#endif
free_http_infos(&(req.http_infos));
retcode = update_http_infos(&req);
}
if (retcode < 0){
xlog(LOG_ERROR, "Failed to update %s information in request %d\n",
is_ssl?"HTTPS":"HTTP", req.id);
proxenet_xfree(req.data);
break;
}
}
if(cfg->ie_compat){
if (is_ssl)
retcode = ie_compat_read_post_body(server_socket, &req, &(ssl_context.server.context));
else
retcode = ie_compat_read_post_body(server_socket, &req, NULL);
if (retcode < 0){
xlog(LOG_ERROR, "%s\n", "Extending IE POST: failed");
proxenet_xfree(req.data);
break;
}
}
/* apply plugins for requests (from browser to server) */
if (cfg->verbose) {
xlog(LOG_INFO, "%s request to '%s:%d'\n",
is_ssl?"SSL":"plain", req.http_infos.hostname, req.http_infos.port);
if (cfg->verbose > 1)
xlog(LOG_INFO, "%s %s %s\n",
req.http_infos.method, req.http_infos.uri, req.http_infos.version);
}
#ifdef DEBUG
xlog(LOG_DEBUG, "Request %d pre-plugins: buflen:%lu\n",
req.id, req.size);
#endif
/* hook request with all plugins in plugins_list */
if ( proxenet_apply_plugins(&req) < 0) {
/* extremist action: any error on any plugin discard the whole request */
proxenet_xfree( req.data );
break;
}
#ifdef DEBUG
xlog(LOG_DEBUG, "Request %d post-plugins: buflen:%lu\n",
req.id, req.size);
if(cfg->verbose > 2)
proxenet_hexdump(req.data, req.size);
#endif
send_to_server:
/* send modified data */
if (is_ssl && req.do_intercept) {
retcode = proxenet_ssl_write(&(ssl_context.client.context), req.data, req.size);
} else {
retcode = proxenet_write(client_socket, req.data, req.size);
}
/* reset data */
proxenet_xfree(req.data);
req.size = 0;
if (retcode < 0) {
xlog(LOG_ERROR, "[%d] %s\n", req.id, "Failed to write to server");
break;
}
#ifdef DEBUG
xlog(LOG_DEBUG, "Written %d bytes to server (socket=%s socket #%d)\n",
retcode, is_ssl?"SSL":"PLAIN", client_socket);
#endif
} /* end FD_ISSET(data_from_browser) */
/* is there data from remote server to proxy ? */
if( client_socket > 0 && FD_ISSET(client_socket, &rfds ) ) {
if(req.is_ssl && req.do_intercept) {
n = proxenet_read_all(client_socket, &req.data, &ssl_context.client.context);
} else {
n = proxenet_read_all(client_socket, &req.data, NULL);
}
if (n < 0){
xlog(LOG_ERROR, "read() %s on cli_sock=#%d failed: %d\n",
is_ssl?"SSL":"PLAIN",
client_socket, n);
break;
}
if (n==0){
#ifdef DEBUG
xlog(LOG_DEBUG, "Socket EOF from server (cli_sock=#%d)\n",
client_socket);
#endif
break;
}
/* update request data structure */
req.type = RESPONSE;
/* from here, n can only be positive */
req.size = (size_t) n;
bytes_recv += n;
if (req.do_intercept==false){
#ifdef DEBUG
xlog(LOG_DEBUG, "Intercept disabled for '%s'->browser\n", req.http_infos.hostname);
#endif
goto send_to_client;
}
/* apply plugins for response (from server to browser) */
#ifdef DEBUG
xlog(LOG_DEBUG, "Response %d pre-plugins: buflen:%lu\n",
req.id, req.size);
#endif
/* execute response hooks */
if ( proxenet_apply_plugins(&req) < 0) {
/* extremist action: any error on any plugin discard the whole request */
proxenet_xfree(req.data);
break;
}
#ifdef DEBUG
xlog(LOG_DEBUG, "Response %d post-plugins: buflen:%lu\n",
req.id, req.size);
if(cfg->verbose > 2)
proxenet_hexdump(req.data, req.size);
#endif
send_to_client:
/* send modified data to client */
if (req.is_ssl && req.do_intercept)
retcode = proxenet_ssl_write(&(ssl_context.server.context), req.data, req.size);
else
retcode = proxenet_write(server_socket, req.data, req.size);
if (retcode < 0) {
xlog(LOG_ERROR, "[%d] %s\n", req.id, "proxy->client: write failed");
proxenet_xfree(req.data);
break;
}
#ifdef DEBUG
xlog(LOG_DEBUG, "Written %d bytes to browser (socket=%s socket #%d)\n",
retcode, is_ssl?"SSL":"PLAIN", client_socket);
#endif
proxenet_xfree(req.data);
} /* end FD_ISSET(data_from_server) */
} /* end for(;;) { select() } */
if (req.id) {
if (cfg->verbose)
xlog(LOG_INFO, "End of request %d, cleaning context\n", req.id);
free_http_infos(&(req.http_infos));
}
/* close client socket */
if (client_socket > 0) {
if (cfg->verbose >= 2)
xlog(LOG_INFO, "Closing %s->server (fd=#%d)\n", PROGNAME, client_socket);
proxenet_close_socket(client_socket, &(ssl_context.client));
}
/* close local socket */
if (server_socket > 0) {
if (cfg->verbose >= 2)
xlog(LOG_INFO, "Closing browser->%s (fd=#%d)\n", PROGNAME, server_socket);
proxenet_close_socket(server_socket, &(ssl_context.server));
}
#ifdef DEBUG
xlog(LOG_DEBUG, "Request %d: Structures closed, leaving\n", req.id);
#endif
/* and that's all folks */
return;
}
static int proxenet_apply_plugins(request_t *request)
{
plugin_t *p = NULL;
char *old_data = NULL;
char *res = NULL;
char* (*plugin_function)(plugin_t*, request_t*) = NULL;
for (p=plugins_list; p!=NULL; p=p->next) {
if (p->state == INACTIVE)
continue;
switch (p->type) {
#ifdef _PYTHON_PLUGIN
case _PYTHON_: plugin_function = proxenet_python_plugin; break;
#endif
#ifdef _C_PLUGIN
case _C_: plugin_function = proxenet_c_plugin; break;
#endif
#ifdef _RUBY_PLUGIN
case _RUBY_: plugin_function = proxenet_ruby_plugin; break;
#endif
#ifdef _PERL_PLUGIN
case _PERL_: plugin_function = proxenet_perl_plugin; break;
#endif
#ifdef _LUA_PLUGIN
case _LUA_: plugin_function = proxenet_lua_plugin; break;
#endif
#ifdef _TCL_PLUGIN
case _TCL_: plugin_function = proxenet_tcl_plugin; break;
#endif
#ifdef _JAVA_PLUGIN
case _JAVA_: plugin_function = proxenet_java_plugin; break;
#endif
default:
xlog(LOG_CRITICAL, "Type %d not supported (yet)\n", p->type);
return -1;
}
#ifdef DEBUG
xlog(LOG_DEBUG, "Calling '%s:%s' with rid=%d (%s)\n",
p->name,
request->type==REQUEST?CFG_REQUEST_PLUGIN_FUNCTION:CFG_RESPONSE_PLUGIN_FUNCTION,
request->id,
supported_plugins_str[p->type]
);
#endif
old_data = request->data;
#ifdef DEBUG
struct timeval tstart, tend;
proxenet_xzero(&tstart, sizeof(struct timeval));
proxenet_xzero(&tend, sizeof(struct timeval));
gettimeofday(&tstart, NULL);
#endif
res = (*plugin_function)(p, request);
#ifdef DEBUG
gettimeofday(&tend, NULL);
unsigned long sec = tend.tv_sec-tstart.tv_sec;
unsigned long msec = (tend.tv_usec-tstart.tv_usec)/1000;
unsigned long usec = (tend.tv_usec-tstart.tv_usec)%1000;
xlog(LOG_DEBUG, "[%s] '%s:%s' executed in %dsec, %dms, %dus\n",
supported_plugins_str[p->type], p->name,
request->type==REQUEST?CFG_REQUEST_PLUGIN_FUNCTION:CFG_RESPONSE_PLUGIN_FUNCTION,
sec, msec, usec);
#endif
/*
* We consider a plugin execution has failed if one of those conditions is found:
* - the plugin_*_apply() function returned NULL
* - the new request size is 0
*/
if (res == NULL || request->size==0) {
/*
* If the plugin function returned NULL, it means that an error occured
* somewhere in the VM run. To be safe, we disable the plugin, and restore
* the previous context.
*/
request->data = old_data;
xlog(LOG_ERROR, "Plugin '%s' failed, disabling...\n", p->name);
proxenet_plugin_set_state(p, INACTIVE);
continue;
}
request->data = res;
if (request->data) {
/*
* If new_data is different, it means a new buffer was allocated by
* (*plugin_function)(). The old_data can then be free-ed.
*/
proxenet_xfree(old_data);
#ifdef DEBUG
xlog(LOG_DEBUG,
"New data from '%s:%s' on rid=%d\n",
request->type==REQUEST?CFG_REQUEST_PLUGIN_FUNCTION:CFG_RESPONSE_PLUGIN_FUNCTION,
p->name,
p->id);
#endif
} else {
/* Otherwise (data different or error), use the original data */
request->data = old_data;
#ifdef DEBUG
xlog(LOG_DEBUG,
"No new data from '%s:%s' on rid=%d\n",
request->type==REQUEST?CFG_REQUEST_PLUGIN_FUNCTION:CFG_RESPONSE_PLUGIN_FUNCTION,
p->name,
p->id);
#endif
}
}
return 0;
}
static int proxenet_apply_plugins(request_t *request)
{
plugin_t *p = NULL;
char *old_data = NULL;
char* (*plugin_function)(plugin_t*, request_t*) = NULL;
for (p=plugins_list; p!=NULL; p=p->next) {
if (p->state == INACTIVE)
continue;
switch (p->type) {
#ifdef _PYTHON_PLUGIN
case _PYTHON_: plugin_function = proxenet_python_plugin; break;
#endif
#ifdef _C_PLUGIN
case _C_: plugin_function = proxenet_c_plugin; break;
#endif
#ifdef _RUBY_PLUGIN
case _RUBY_: plugin_function = proxenet_ruby_plugin; break;
#endif
#ifdef _PERL_PLUGIN
case _PERL_: plugin_function = proxenet_perl_plugin; break;
#endif
#ifdef _LUA_PLUGIN
case _LUA_: plugin_function = proxenet_lua_plugin; break;
#endif
#ifdef _TCL_PLUGIN
case _TCL_: plugin_function = proxenet_tcl_plugin; break;
#endif
#ifdef _JAVA_PLUGIN
case _JAVA_: plugin_function = proxenet_java_plugin; break;
#endif
default:
xlog(LOG_CRITICAL, "Type %d not supported (yet)\n", p->type);
return -1;
}
#ifdef DEBUG
xlog(LOG_DEBUG, "Calling '%s:%s' with rid=%d (%s)\n",
p->name,
request->type==REQUEST?CFG_REQUEST_PLUGIN_FUNCTION:CFG_RESPONSE_PLUGIN_FUNCTION,
request->id,
supported_plugins_str[p->type]
);
#endif
old_data = request->data;
#ifdef DEBUG
struct timeval tstart, tend;
proxenet_xzero(&tstart, sizeof(struct timeval));
proxenet_xzero(&tend, sizeof(struct timeval));
gettimeofday(&tstart, NULL);
#endif
request->data = (*plugin_function)(p, request);
#ifdef DEBUG
gettimeofday(&tend, NULL);
xlog(LOG_DEBUG, "[%s] '%s:%s' executed in %lusec, %lums\n",
supported_plugins_str[p->type], p->name,
request->type==REQUEST?CFG_REQUEST_PLUGIN_FUNCTION:CFG_RESPONSE_PLUGIN_FUNCTION,
tend.tv_sec-tstart.tv_sec,
tend.tv_usec-tstart.tv_usec);
#endif
if (request->data) {
/*
* If new_data is different, it means a new buffer was allocated by
* (*plugin_function)(). The old_data can then be free-ed.
*/
proxenet_xfree(old_data);
#ifdef DEBUG
xlog(LOG_DEBUG,
"New data from '%s:%s' on rid=%d\n",
request->type==REQUEST?CFG_REQUEST_PLUGIN_FUNCTION:CFG_RESPONSE_PLUGIN_FUNCTION,
p->name,
p->id);
#endif
} else {
/* Otherwise (data different or error), use the original data */
request->data = old_data;
#ifdef DEBUG
xlog(LOG_DEBUG,
"No new data from '%s:%s' on rid=%d\n",
request->type==REQUEST?CFG_REQUEST_PLUGIN_FUNCTION:CFG_RESPONSE_PLUGIN_FUNCTION,
p->name,
p->id);
#endif
}
/* Additionnal check for dummy plugin coder */
if (!request->data || !request->size) {
xlog(LOG_CRITICAL, "Plugin '%s' is invalid, disabling\n", p->name);
p->state = INACTIVE;
if (cfg->verbose){
if(!request->data)
xlog(LOG_CRITICAL, "Plugin '%s' returned a NULL value\n", p->name);
else
xlog(LOG_CRITICAL, "Plugin '%s' returned a NULL size\n", p->name);
}
return -1;
}
}
return 0;
}
