311 lines
7.9 KiB
C
311 lines
7.9 KiB
C
/*
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* This file Copyright (C) 2007-2014 Mnemosyne LLC
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*
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* It may be used under the GNU GPL versions 2 or 3
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* or any future license endorsed by Mnemosyne LLC.
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*
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*/
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#include <errno.h>
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#ifdef SYSTEM_MINIUPNP
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#include <miniupnpc/miniupnpc.h>
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#include <miniupnpc/upnpcommands.h>
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#else
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#include <miniupnp/miniupnpc.h>
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#include <miniupnp/upnpcommands.h>
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#endif
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#include "transmission.h"
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#include "log.h"
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#include "port-forwarding.h"
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#include "session.h"
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#include "tr-assert.h"
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#include "upnp.h"
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#include "utils.h"
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static char const* getKey(void)
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{
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return _("Port Forwarding (UPnP)");
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}
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typedef enum
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{
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TR_UPNP_IDLE,
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TR_UPNP_ERR,
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TR_UPNP_DISCOVER,
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TR_UPNP_MAP,
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TR_UPNP_UNMAP
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}
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tr_upnp_state;
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struct tr_upnp
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{
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bool hasDiscovered;
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struct UPNPUrls urls;
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struct IGDdatas data;
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int port;
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char lanaddr[16];
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bool isMapped;
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tr_upnp_state state;
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};
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/**
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***
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**/
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tr_upnp* tr_upnpInit(void)
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{
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tr_upnp* ret = tr_new0(tr_upnp, 1);
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ret->state = TR_UPNP_DISCOVER;
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ret->port = -1;
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return ret;
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}
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void tr_upnpClose(tr_upnp* handle)
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{
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TR_ASSERT(!handle->isMapped);
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TR_ASSERT(handle->state == TR_UPNP_IDLE || handle->state == TR_UPNP_ERR || handle->state == TR_UPNP_DISCOVER);
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if (handle->hasDiscovered)
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{
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FreeUPNPUrls(&handle->urls);
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}
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tr_free(handle);
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}
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/**
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*** Wrappers for miniupnpc functions
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**/
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static struct UPNPDev* tr_upnpDiscover(int msec)
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{
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struct UPNPDev* ret;
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bool have_err;
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#if (MINIUPNPC_API_VERSION >= 8) /* adds ipv6 and error args */
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int err = UPNPDISCOVER_SUCCESS;
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#if (MINIUPNPC_API_VERSION >= 14) /* adds ttl */
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ret = upnpDiscover(msec, NULL, NULL, 0, 0, 2, &err);
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#else
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ret = upnpDiscover(msec, NULL, NULL, 0, 0, &err);
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#endif
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have_err = err != UPNPDISCOVER_SUCCESS;
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#else
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ret = upnpDiscover(msec, NULL, NULL, 0);
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have_err = ret == NULL;
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#endif
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if (have_err)
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{
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tr_logAddNamedDbg(getKey(), "upnpDiscover failed (errno %d - %s)", errno, tr_strerror(errno));
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}
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return ret;
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}
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static int tr_upnpGetSpecificPortMappingEntry(tr_upnp* handle, char const* proto)
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{
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int err;
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char intClient[16];
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char intPort[16];
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char portStr[16];
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*intClient = '\0';
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*intPort = '\0';
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tr_snprintf(portStr, sizeof(portStr), "%d", (int)handle->port);
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#if (MINIUPNPC_API_VERSION >= 10) /* adds remoteHost arg */
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err = UPNP_GetSpecificPortMappingEntry(handle->urls.controlURL, handle->data.first.servicetype, portStr, proto,
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NULL /*remoteHost*/, intClient, intPort, NULL /*desc*/, NULL /*enabled*/, NULL /*duration*/);
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#elif (MINIUPNPC_API_VERSION >= 8) /* adds desc, enabled and leaseDuration args */
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err = UPNP_GetSpecificPortMappingEntry(handle->urls.controlURL, handle->data.first.servicetype, portStr, proto, intClient,
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intPort, NULL /*desc*/, NULL /*enabled*/, NULL /*duration*/);
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#else
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err = UPNP_GetSpecificPortMappingEntry(handle->urls.controlURL, handle->data.first.servicetype, portStr, proto, intClient,
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intPort);
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#endif
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return err;
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}
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static int tr_upnpAddPortMapping(tr_upnp const* handle, char const* proto, tr_port port, char const* desc)
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{
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int err;
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int const old_errno = errno;
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char portStr[16];
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errno = 0;
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tr_snprintf(portStr, sizeof(portStr), "%d", (int)port);
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#if (MINIUPNPC_API_VERSION >= 8)
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err = UPNP_AddPortMapping(handle->urls.controlURL, handle->data.first.servicetype, portStr, portStr, handle->lanaddr, desc,
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proto, NULL, NULL);
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#else
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err = UPNP_AddPortMapping(handle->urls.controlURL, handle->data.first.servicetype, portStr, portStr, handle->lanaddr, desc,
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proto, NULL);
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#endif
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if (err != 0)
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{
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tr_logAddNamedDbg(getKey(), "%s Port forwarding failed with error %d (errno %d - %s)", proto, err, errno,
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tr_strerror(errno));
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}
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errno = old_errno;
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return err;
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}
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static void tr_upnpDeletePortMapping(tr_upnp const* handle, char const* proto, tr_port port)
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{
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char portStr[16];
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tr_snprintf(portStr, sizeof(portStr), "%d", (int)port);
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UPNP_DeletePortMapping(handle->urls.controlURL, handle->data.first.servicetype, portStr, proto, NULL);
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}
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/**
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***
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**/
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enum
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{
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UPNP_IGD_NONE = 0,
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UPNP_IGD_VALID_CONNECTED = 1,
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UPNP_IGD_VALID_NOT_CONNECTED = 2,
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UPNP_IGD_INVALID = 3
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};
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int tr_upnpPulse(tr_upnp* handle, tr_port port, bool isEnabled, bool doPortCheck)
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{
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int ret;
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if (isEnabled && handle->state == TR_UPNP_DISCOVER)
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{
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struct UPNPDev* devlist;
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devlist = tr_upnpDiscover(2000);
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errno = 0;
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if (UPNP_GetValidIGD(devlist, &handle->urls, &handle->data, handle->lanaddr,
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sizeof(handle->lanaddr)) == UPNP_IGD_VALID_CONNECTED)
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{
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tr_logAddNamedInfo(getKey(), _("Found Internet Gateway Device \"%s\""), handle->urls.controlURL);
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tr_logAddNamedInfo(getKey(), _("Local Address is \"%s\""), handle->lanaddr);
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handle->state = TR_UPNP_IDLE;
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handle->hasDiscovered = true;
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}
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else
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{
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handle->state = TR_UPNP_ERR;
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tr_logAddNamedDbg(getKey(), "UPNP_GetValidIGD failed (errno %d - %s)", errno, tr_strerror(errno));
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tr_logAddNamedDbg(getKey(), "If your router supports UPnP, please make sure UPnP is enabled!");
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}
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freeUPNPDevlist(devlist);
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}
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if ((handle->state == TR_UPNP_IDLE) &&
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(handle->isMapped) &&
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(!isEnabled || handle->port != port))
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{
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handle->state = TR_UPNP_UNMAP;
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}
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if (isEnabled &&
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handle->isMapped &&
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doPortCheck &&
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((tr_upnpGetSpecificPortMappingEntry(handle, "TCP") != UPNPCOMMAND_SUCCESS) ||
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(tr_upnpGetSpecificPortMappingEntry(handle, "UDP") != UPNPCOMMAND_SUCCESS)))
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{
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tr_logAddNamedInfo(getKey(), _("Port %d isn't forwarded"), handle->port);
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handle->isMapped = false;
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}
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if (handle->state == TR_UPNP_UNMAP)
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{
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tr_upnpDeletePortMapping(handle, "TCP", handle->port);
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tr_upnpDeletePortMapping(handle, "UDP", handle->port);
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tr_logAddNamedInfo(getKey(), _("Stopping port forwarding through \"%s\", service \"%s\""), handle->urls.controlURL,
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handle->data.first.servicetype);
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handle->isMapped = false;
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handle->state = TR_UPNP_IDLE;
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handle->port = -1;
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}
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if ((handle->state == TR_UPNP_IDLE) && isEnabled && !handle->isMapped)
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{
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handle->state = TR_UPNP_MAP;
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}
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if (handle->state == TR_UPNP_MAP)
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{
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errno = 0;
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if (handle->urls.controlURL == NULL)
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{
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handle->isMapped = false;
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}
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else
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{
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char desc[64];
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tr_snprintf(desc, sizeof(desc), "%s at %d", TR_NAME, port);
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int const err_tcp = tr_upnpAddPortMapping(handle, "TCP", port, desc);
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int const err_udp = tr_upnpAddPortMapping(handle, "UDP", port, desc);
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handle->isMapped = err_tcp == 0 || err_udp == 0;
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}
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tr_logAddNamedInfo(getKey(), _("Port forwarding through \"%s\", service \"%s\". (local address: %s:%d)"),
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handle->urls.controlURL, handle->data.first.servicetype, handle->lanaddr, port);
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if (handle->isMapped)
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{
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tr_logAddNamedInfo(getKey(), "%s", _("Port forwarding successful!"));
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handle->port = port;
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handle->state = TR_UPNP_IDLE;
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}
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else
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{
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tr_logAddNamedDbg(getKey(), "If your router supports UPnP, please make sure UPnP is enabled!");
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handle->port = -1;
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handle->state = TR_UPNP_ERR;
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}
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}
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switch (handle->state)
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{
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case TR_UPNP_DISCOVER:
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ret = TR_PORT_UNMAPPED;
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break;
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case TR_UPNP_MAP:
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ret = TR_PORT_MAPPING;
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break;
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case TR_UPNP_UNMAP:
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ret = TR_PORT_UNMAPPING;
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break;
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case TR_UPNP_IDLE:
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ret = handle->isMapped ? TR_PORT_MAPPED : TR_PORT_UNMAPPED;
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break;
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default:
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ret = TR_PORT_ERROR;
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break;
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}
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return ret;
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}
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