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freeswitch/libs/sofia-sip/libsofia-sip-ua/su/su_proxy.c

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/*
* This file is part of the Sofia-SIP package
*
* Copyright (C) 2005 Nokia Corporation.
*
* Contact: Pekka Pessi <pekka.pessi@nokia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
/**@internal @ingroup su_root_ex
*
* @file su_proxy.c
*
* @brief Transport level proxy demonstrating various @b su features.
*
* @author Pekka Pessi <Pekka.Pessi@nokia.com>
*
* @date Created: Wed May 23 17:42:40 2001 ppessi
*/
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stddef.h>
#include <errno.h>
#include <assert.h>
typedef struct proxy_s proxy_t;
typedef struct forwarder_s forwarder_t;
typedef struct buffer_s buffer_t;
#define SU_ROOT_MAGIC_T proxy_t
#define SU_MSG_ARG_T su_socket_t
#define SU_WAKEUP_ARG_T forwarder_t
#include "sofia-sip/su.h"
#include "sofia-sip/su_wait.h"
#include "sofia-sip/su_alloc.h"
#include "su_module_debug.h"
#if HAVE_FUNC
#elif HAVE_FUNCTION
#define __func__ __FUNCTION__
#else
#define __func__ "su_proxy"
#endif
struct proxy_s
{
su_home_t pr_home[1];
su_root_t *pr_root;
su_addrinfo_t *pr_addrinfo;
forwarder_t *pr_forwarders;
};
struct forwarder_s
{
forwarder_t *f_next;
forwarder_t **f_prev;
proxy_t *f_pr;
su_socket_t f_socket;
su_wait_t f_wait[2];
forwarder_t *f_peer;
su_sockaddr_t f_dest[1];
buffer_t *f_buf;
unsigned long f_sent; /* bytes sent */
unsigned f_shutdown : 1;
unsigned f_upstream : 1;
};
struct buffer_s
{
buffer_t *b_next;
buffer_t **b_prev;
int b_sent;
int b_used;
char b_data[8192];
};
char const help[] =
"usage: su_proxy [-ntu] remotehost remoteport [localport]\n";
void usage(void)
{
fputs(help, stderr);
}
static int pr_init(proxy_t *pr);
static int pr_config(proxy_t *pr, int argc, char *argv[]);
static int pr_run(proxy_t *pr);
static void pr_deinit(proxy_t *pr);
static forwarder_t *forwarder_create(proxy_t *pr);
static forwarder_t *forwarder_create_listener(proxy_t *pr, su_addrinfo_t *ai);
static void forwarder_deinit(forwarder_t *f);
static int forwarder_init_stream(forwarder_t *f);
static int forwarder_init_dgram(forwarder_t *f);
static int forwarder_accept(proxy_t *pr, su_wait_t *w, forwarder_t *f);
static int forwarder_stream_peer(proxy_t *pr, forwarder_t *f);
static int forwarder_connected(proxy_t *pr, su_wait_t *w, forwarder_t *f);
static int forwarder_recv(proxy_t *pr, su_wait_t *w, forwarder_t *f);
static int forwarder_send(proxy_t *pr, forwarder_t *f, buffer_t *b);
static int forwarder_append(forwarder_t *f, buffer_t *b0);
static int forwarder_empty(proxy_t *pr, su_wait_t *w, forwarder_t *f);
static int forwarder_shutdown(forwarder_t *f);
static void forwarder_close(forwarder_t *f1);
int main(int argc, char *argv[])
{
proxy_t pr[1] = {{{ SU_HOME_INIT(pr) }}};
int error;
error = pr_init(pr);
if (error == 0) {
if ((error = pr_config(pr, argc, argv)) > 1)
usage();
}
if (error == 0)
error = pr_run(pr);
pr_deinit(pr);
su_deinit();
exit(error);
}
int pr_init(proxy_t *pr)
{
su_init();
su_home_init(pr->pr_home);
pr->pr_root = su_root_create(pr);
return pr->pr_root ? 0 : 1;
}
int pr_config(proxy_t *pr, int argc, char *argv[])
{
su_addrinfo_t *res = NULL, *ai, hints[1] = {{ 0 }};
char *service;
int error;
char const *option;
/* char const *argv0 = argv[0]; */
while (argv[1][0] == '-') {
option = argv[1];
argv++, argc--;
if (strcmp(option, "--") == 0)
break;
else if (strcmp(option, "-n") == 0) {
hints->ai_flags |= AI_NUMERICHOST;
}
else if (strcmp(option, "-d") == 0) {
hints->ai_socktype = SOCK_DGRAM;
}
else if (strcmp(option, "-s") == 0) {
hints->ai_socktype = SOCK_STREAM;
}
else if (strcmp(option, "-4") == 0) {
hints->ai_family = AF_INET;
}
#if SU_HAVE_IN6
else if (strcmp(option, "-6") == 0) {
hints->ai_family = AF_INET6;
}
#endif
}
if (argc < 3)
return 2;
if ((error = su_getaddrinfo(argv[1], argv[2], hints, &res))) {
fprintf(stderr, "getaddrinfo: %s:%s: %s\n",
argv[1], argv[2], su_gai_strerror(error));
return 1;
}
pr->pr_addrinfo = res;
if (argv[3])
service = argv[3];
else
service = argv[2];
hints->ai_flags |= AI_PASSIVE;
if ((error = su_getaddrinfo(NULL, service, hints, &res))) {
fprintf(stderr, "getaddrinfo: %s: %s\n", service, su_gai_strerror(error));
return 1;
}
for (ai = res;
ai;
ai = ai->ai_next) {
forwarder_create_listener(pr, ai);
}
su_freeaddrinfo(res);
if (!pr->pr_forwarders) {
fprintf(stderr, "%s:%s: %s\n", argv[1], argv[2], "unable to forward");
return 1;
}
return 0;
}
void pr_deinit(proxy_t *pr)
{
if (pr->pr_addrinfo)
su_freeaddrinfo(pr->pr_addrinfo), pr->pr_addrinfo = NULL;
if (pr->pr_root)
su_root_destroy(pr->pr_root), pr->pr_root = NULL;
su_home_deinit(pr->pr_home);
su_deinit();
}
static int pr_run(proxy_t *pr)
{
su_root_run(pr->pr_root);
return 0;
}
forwarder_t *forwarder_create(proxy_t *pr)
{
forwarder_t *f;
assert(pr);
f = su_zalloc(pr->pr_home, sizeof (*f));
if (f) {
f->f_socket = INVALID_SOCKET;
su_wait_init(f->f_wait);
su_wait_init(f->f_wait + 1);
f->f_pr = pr;
if ((f->f_next = pr->pr_forwarders))
f->f_next->f_prev = &f->f_next;
f->f_prev = &pr->pr_forwarders;
pr->pr_forwarders = f;
}
return f;
}
void forwarder_destroy(forwarder_t *f)
{
if (f) {
forwarder_deinit(f);
if (f->f_peer) {
f->f_peer->f_peer = NULL;
forwarder_destroy(f->f_peer);
f->f_peer = NULL;
}
assert(f->f_prev);
if ((*f->f_prev = f->f_next))
f->f_next->f_prev = f->f_prev;
su_free(f->f_pr->pr_home, f);
}
}
void forwarder_deinit(forwarder_t *f)
{
su_root_unregister(f->f_pr->pr_root, f->f_wait, NULL, f);
su_wait_destroy(f->f_wait);
su_root_unregister(f->f_pr->pr_root, f->f_wait + 1, NULL, f);
su_wait_destroy(f->f_wait + 1);
if (f->f_socket != INVALID_SOCKET)
su_close(f->f_socket), f->f_socket = INVALID_SOCKET;
if (f->f_buf)
su_free(f->f_pr->pr_home, f->f_buf), f->f_buf = NULL;
}
static forwarder_t *forwarder_create_listener(proxy_t *pr, su_addrinfo_t *ai)
{
forwarder_t *f;
su_socket_t s;
if (ai->ai_socktype != SOCK_STREAM &&
ai->ai_socktype != SOCK_DGRAM)
return NULL;
f = forwarder_create(pr);
if (f) {
s = su_socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (s != INVALID_SOCKET) {
f->f_socket = s;
su_setblocking(s, 0);
su_setreuseaddr(s, 1);
if (bind(s, ai->ai_addr, ai->ai_addrlen) >= 0) {
if (ai->ai_socktype == SOCK_STREAM ?
forwarder_init_stream(f) >= 0 :
forwarder_init_dgram(f) >= 0)
return f;
}
else {
SU_DEBUG_1(("%s: bind: %s\n", __func__, su_strerror(su_errno())));
}
}
}
forwarder_destroy(f);
return NULL;
}
int forwarder_init_stream(forwarder_t *f)
{
if (listen(f->f_socket, SOMAXCONN) < 0)
return SOCKET_ERROR;
if (su_wait_create(f->f_wait, f->f_socket, SU_WAIT_ACCEPT) < 0)
return SOCKET_ERROR;
if (su_root_register(f->f_pr->pr_root, f->f_wait,
forwarder_accept, f, 0) < 0)
return SOCKET_ERROR;
return 0;
}
int forwarder_init_dgram(forwarder_t *f)
{
/* Unimplemented */
return SOCKET_ERROR;
}
/** Accept a connection. */
int forwarder_accept(proxy_t *pr, su_wait_t *w, forwarder_t *f0)
{
forwarder_t *f;
su_sockaddr_t *su;
socklen_t sulen;
int events;
events = su_wait_events(w, f0->f_socket);
f = forwarder_create(pr);
if (f) {
su = f->f_dest;
sulen = sizeof(f->f_dest);
f->f_socket = accept(f0->f_socket, &su->su_sa, &sulen);
f->f_upstream = 1;
if (f->f_socket != INVALID_SOCKET) {
char buf[SU_ADDRSIZE];
SU_DEBUG_3(("accept: connection from %s:%u\n",
inet_ntop(su->su_family, SU_ADDR(su), buf, sizeof(buf)),
ntohs(su->su_port)));
if (!su_wait_create(f->f_wait, f->f_socket, SU_WAIT_IN) &&
!su_wait_create(f->f_wait + 1, f->f_socket, SU_WAIT_OUT)) {
if (forwarder_stream_peer(pr, f) != SOCKET_ERROR) {
/* success */
return 0;
}
}
else {
SU_DEBUG_1(("%s: cannot create wait objects\n", __func__));
}
}
}
forwarder_destroy(f);
return 0;
}
int forwarder_stream_peer(proxy_t *pr, forwarder_t *f_peer)
{
forwarder_t *f;
su_addrinfo_t *ai;
assert(f_peer);
f = forwarder_create(pr);
if (!f) {
SU_DEBUG_1(("%s: cannot allocate peer\n", __func__));
goto error;
}
for (ai = pr->pr_addrinfo; ai; ai = ai->ai_next) {
if (ai->ai_socktype == SOCK_STREAM)
break;
}
if (!ai) {
SU_DEBUG_1(("%s: no matching destination\n", __func__));
goto error;
}
f->f_socket = su_socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (f->f_socket == INVALID_SOCKET) {
SU_DEBUG_1(("%s: socket: %s\n", __func__, su_strerror(su_errno())));
goto error;
}
if (su_wait_create(f->f_wait, f->f_socket, SU_WAIT_IN) ||
su_wait_create(f->f_wait + 1, f->f_socket, SU_WAIT_OUT)) {
SU_DEBUG_1(("%s: cannot create wait objects\n", __func__));
goto error;
}
/* Asynchronous connect */
su_setblocking(f->f_socket, 0);
su_seterrno(0);
connect(f->f_socket, ai->ai_addr, ai->ai_addrlen);
memcpy(f->f_dest, ai->ai_addr, ai->ai_addrlen);
if (su_errno() != EINPROGRESS) {
SU_DEBUG_1(("%s: connect: %s\n", __func__, su_strerror(su_errno())));
goto error;
}
if (su_root_register(pr->pr_root, f->f_wait + 1,
forwarder_connected, f, 0) == -1) {
SU_DEBUG_1(("%s: cannot register\n", __func__));
goto error;
}
f->f_peer = f_peer;
f_peer->f_peer = f;
return 0;
error:
forwarder_destroy(f);
return SOCKET_ERROR;
}
/** Connection is complete. */
int forwarder_connected(proxy_t *pr, su_wait_t *w, forwarder_t *f)
{
int events, error;
forwarder_t *f_peer;
events = su_wait_events(w, f->f_socket);
error = su_soerror(f->f_socket);
if (error) {
SU_DEBUG_1(("connect: %s\n", su_strerror(error)));
forwarder_destroy(f);
return 0;
}
su_root_unregister(pr->pr_root, f->f_wait + 1, forwarder_connected, f);
/* Wait for data, forward it to peer */
assert(f->f_peer);
f_peer = f->f_peer;
su_root_register(pr->pr_root, f->f_wait, forwarder_recv, f, 0);
su_root_register(pr->pr_root, f_peer->f_wait, forwarder_recv, f_peer, 0);
return 0;
}
/** Receive data, forward it to peer */
int forwarder_recv(proxy_t *pr, su_wait_t *w, forwarder_t *f)
{
buffer_t b[1];
int n, events;
events = su_wait_events(w, f->f_socket);
n = recv(f->f_socket, b->b_data, sizeof(b->b_data), 0);
if (n > 0) {
b->b_sent = 0; b->b_used = n;
if (f->f_peer->f_buf) {
forwarder_append(f, b);
return 0;
}
if (forwarder_send(pr, f->f_peer, b) >= 0) {
if (b->b_sent < b->b_used) {
su_root_unregister(pr->pr_root, w, forwarder_recv, f);
su_root_register(pr->pr_root, f->f_peer->f_wait + 1,
forwarder_empty, f->f_peer, 0);
forwarder_append(f, b);
}
return 0;
}
else {
/* Error when sending */
}
}
if (n < 0) {
int error = su_errno();
SU_DEBUG_1(("recv: %s\n", su_strerror(error)));
if (error == EINTR || error == EAGAIN || error == EWOULDBLOCK) {
return 0;
}
/* XXX */
forwarder_destroy(f);
}
/* shutdown */
forwarder_shutdown(f);
return 0;
}
int forwarder_send(proxy_t *pr, forwarder_t *f, buffer_t *b)
{
int n, error;
do {
n = send(f->f_socket, b->b_data + b->b_sent, b->b_used - b->b_sent, 0);
if (n < 0) {
error = su_errno();
if (error == EINTR)
continue;
SU_DEBUG_1(("send: %s\n", su_strerror(error)));
if (error != EAGAIN && error != EWOULDBLOCK)
return -error;
}
else {
f->f_sent += n;
}
}
while (n > 0 && (b->b_sent += n) < b->b_used);
return b->b_used - b->b_sent;
}
int forwarder_append(forwarder_t *f, buffer_t *b0)
{
buffer_t *b, **bb;
int unsent;
/* Find last buffer */
for (bb = &f->f_buf; *bb; bb = &(*bb)->b_next)
;
unsent = b0->b_used - b0->b_sent;
assert(unsent > 0);
b = su_alloc(f->f_pr->pr_home, offsetof(buffer_t, b_data[unsent]));
if (b) {
*bb = b;
b->b_next = NULL;
b->b_prev = bb;
b->b_used = unsent;
b->b_sent = 0;
memcpy(b->b_data, b0->b_data + b->b_sent, unsent);
}
return b ? 0 : -1;
}
/** Empty forwarder buffers */
int forwarder_empty(proxy_t *pr, su_wait_t *w, forwarder_t *f)
{
buffer_t *b;
int n, events;
events = su_wait_events(w, f->f_socket);
while ((b = f->f_buf)) {
n = forwarder_send(f->f_pr, f, b);
if (n == 0) {
if ((f->f_buf = b->b_next))
b->b_next->b_prev = &f->f_buf;
su_free(f->f_pr->pr_home, b);
continue;
}
else if (n < 0) {
/* XXX */
}
break;
}
if (!f->f_buf) {
forwarder_t *f_peer = f->f_peer;
su_root_unregister(pr->pr_root, w, forwarder_empty, f);
if (!f->f_shutdown) {
/* Buffer is empty - start receiving */
su_root_register(pr->pr_root, f_peer->f_wait, forwarder_recv, f_peer, 0);
}
else {
if (shutdown(f->f_socket, 1) < 0) {
SU_DEBUG_1(("shutdown(1): %s\n", su_strerror(su_errno())));
}
if (f_peer->f_shutdown) {
forwarder_close(f);
}
}
}
return 0;
}
int forwarder_shutdown(forwarder_t *f)
{
forwarder_t *f_peer = f->f_peer;
su_sockaddr_t *su = f->f_dest;
char buf[SU_ADDRSIZE];
SU_DEBUG_3(("forwarder_shutdown: shutdown from %s:%u\n",
inet_ntop(su->su_family, SU_ADDR(su), buf, sizeof(buf)),
ntohs(su->su_port)));
if (su_root_unregister(f->f_pr->pr_root, f->f_wait, forwarder_recv, f) < 0) {
SU_DEBUG_1(("%s: su_root_unregister failed\n", __func__));
}
if (shutdown(f->f_socket, 0) < 0) {
SU_DEBUG_1(("shutdown(0): %s\n", su_strerror(su_errno())));
}
f_peer->f_shutdown = 1;
if (!f_peer->f_buf) {
if (shutdown(f_peer->f_socket, 1) < 0) {
SU_DEBUG_1(("shutdown(1): %s\n", su_strerror(su_errno())));
}
if (f->f_shutdown) {
forwarder_close(f);
}
}
return 0;
}
/** Close a peer pair */
void forwarder_close(forwarder_t *f)
{
su_sockaddr_t *su1, *su2;
char const *d1, *d2;
char buf1[SU_ADDRSIZE], buf2[SU_ADDRSIZE];
if (f->f_upstream)
su1 = f->f_dest, su2 = f->f_peer->f_dest, d1 = "up", d2 = "down";
else
su2 = f->f_dest, su1 = f->f_peer->f_dest, d2 = "up", d1 = "down";
SU_DEBUG_3(("forwarder_close: connection from %s:%u to %s:%d\n",
inet_ntop(su1->su_family, SU_ADDR(su1), buf1, sizeof(buf1)),
ntohs(su1->su_port),
inet_ntop(su2->su_family, SU_ADDR(su2), buf2, sizeof(buf2)),
ntohs(su2->su_port)));
forwarder_destroy(f);
}
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