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Refactored proxy code to use a "strategy" design pattern.

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Proxy backends are selected at runtime. Each proxy exports a list of operations
to the rest of the library. This is similar to the way IO engines are
implemented within nsock.
This commit is contained in:
henri
2013-04-22 19:30:40 +00:00
parent 08c44fe775
commit 3451220630
5 changed files with 216 additions and 143 deletions
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196
nsock/src/proxy_http.c Normal file
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/***************************************************************************
* proxy_http.c -- HTTP Connect proxying. *
* *
***********************IMPORTANT NSOCK LICENSE TERMS***********************
* *
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* LLC This library is free software; you may redistribute and/or *
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***************************************************************************/
/* $Id $ */
#include "nsock.h"
#include "nsock_internal.h"
#include <netdb.h>
#include <string.h>
#define DEFAULT_PROXY_PORT_HTTP "8080"
/* Defined in nsock_proxy.c */
void nsock_proxy_ev_dispatch(nsock_pool nspool, nsock_event nsevent, void *udata);
void forward_event(mspool *nsp, msevent *nse, void *udata);
/* --- PROXY INTERFACE PROTOTYPES --- */
static void proxy_http_init(struct proxy_node *proxy, char *proxystr);
static void proxy_http_handler(nsock_pool nspool, nsock_event nsevent, void *udata);
static nsock_event_id proxy_http_connect_tcp(nsock_pool nsp, nsock_iod ms_iod, nsock_ev_handler handler,
int timeout_msecs, void *userdata, struct sockaddr *saddr,
size_t sslen, unsigned short port);
static char *proxy_http_data_encode(const char *src, size_t len, size_t *dlen);
static char *proxy_http_data_decode(const char *src, size_t len, size_t *dlen);
/* ---- PROXY DEFINITION ---- */
struct proxy_op proxy_http = {
.init = proxy_http_init,
.handler = proxy_http_handler,
.connect_tcp = proxy_http_connect_tcp,
.data_encode = proxy_http_data_encode,
.data_decode = proxy_http_data_decode
};
void proxy_http_init(struct proxy_node *proxy, char *proxystr) {
struct sockaddr_in *sin;
char *strhost, *strport, *saveptr;
strhost = strtok_r(proxystr + 7, ":", &saveptr);
strport = strtok_r(NULL, ":", &saveptr);
if (strport == NULL)
strport = DEFAULT_PROXY_PORT_HTTP;
sin = (struct sockaddr_in *)&proxy->ss;
sin->sin_family = AF_INET;
inet_pton(AF_INET, strhost, &sin->sin_addr);
proxy->sslen = sizeof(struct sockaddr_in);
proxy->port = (unsigned short)atoi(strport);
}
void proxy_http_handler(nsock_pool nspool, nsock_event nsevent, void *udata) {
mspool *nsp = (mspool *)nspool;
msevent *nse = (msevent *)nsevent;
struct sockaddr_storage *ss;
size_t sslen;
unsigned short port;
switch (nse->iod->px_ctx->px_state) {
case PROXY_STATE_INITIAL:
nse->iod->px_ctx->px_state = PROXY_STATE_HTTP_TCP_CONNECTED;
if (PROXY_CTX_NEXT(nse->iod->px_ctx)) {
struct proxy_node *next;
next = PROXY_CTX_NEXT(nse->iod->px_ctx);
ss = &next->ss;
sslen = next->sslen;
port = next->port;
} else {
ss = &nse->iod->px_ctx->target_ss;
sslen = nse->iod->px_ctx->target_sslen;
port = nse->iod->px_ctx->target_port;
}
nsock_printf(nspool, (nsock_iod)nse->iod, nsock_proxy_ev_dispatch,
4000, udata, "CONNECT %s:%d HTTP/1.1\r\n\r\n",
inet_ntop_ez(ss, sslen), (int)port);
nsock_readlines(nspool, (nsock_iod)nse->iod, nsock_proxy_ev_dispatch, 4000, udata, 1);
break;
case PROXY_STATE_HTTP_TCP_CONNECTED:
if (nse->type == NSE_TYPE_READ) {
char *res;
int reslen;
res = nse_readbuf(nse, &reslen);
/* TODO string check!! */
if ((reslen >= 15) && strstr(res, "200 OK")) {
nse->iod->px_ctx->px_state = PROXY_STATE_HTTP_TUNNEL_ESTABLISHED;
}
if (nse->iod->px_ctx->px_current->next == NULL) {
forward_event(nsp, nse, udata);
} else {
nse->iod->px_ctx->px_current = nse->iod->px_ctx->px_current->next;
nse->iod->px_ctx->px_state = PROXY_STATE_INITIAL;
nsock_proxy_ev_dispatch(nsp, nse, udata);
}
}
break;
case PROXY_STATE_HTTP_TUNNEL_ESTABLISHED:
forward_event(nsp, nse, udata);
break;
default:
fatal("Invalid proxy state!");
}
}
nsock_event_id proxy_http_connect_tcp(nsock_pool nsp, nsock_iod ms_iod, nsock_ev_handler handler,
int timeout_msecs, void *userdata, struct sockaddr *saddr,
size_t sslen, unsigned short port) {
msiod *nsi = (msiod *)ms_iod;
struct proxy_node *current;
memcpy(&nsi->px_ctx->target_ss, saddr, sslen);
nsi->px_ctx->target_sslen = sslen;
nsi->px_ctx->target_port = port;
nsi->px_ctx->target_handler = handler;
current = PROXY_CTX_CURRENT(nsi->px_ctx);
saddr = (struct sockaddr *)&current->ss;
sslen = current->sslen;
port = current->port;
handler = nsock_proxy_ev_dispatch;
return nsock_connect_tcp_direct(nsp, ms_iod, handler, timeout_msecs, userdata, saddr, sslen, port);
}
char *proxy_http_data_encode(const char *src, size_t len, size_t *dlen) {
// TODO
return NULL;
}
char *proxy_http_data_decode(const char *src, size_t len, size_t *dlen) {
// TODO
return NULL;
}