static void
logFunc (int severity, const char * message)
{
if (severity >= _EVENT_LOG_ERR)
tr_logAddError ("%s", message);
else
tr_logAddDebug ("%s", message);
}
static void
libeventThreadFunc (void * veh)
{
struct event_base * base;
tr_event_handle * eh = veh;
#ifndef WIN32
/* Don't exit when writing on a broken socket */
signal (SIGPIPE, SIG_IGN);
#endif
/* create the libevent bases */
base = event_base_new ();
/* set the struct's fields */
eh->base = base;
eh->session->event_base = base;
eh->session->evdns_base = evdns_base_new (base, true);
eh->session->events = eh;
/* listen to the pipe's read fd */
eh->pipeEvent = event_new (base, eh->fds[0], EV_READ | EV_PERSIST, readFromPipe, veh);
event_add (eh->pipeEvent, NULL);
event_set_log_callback (logFunc);
/* loop until all the events are done */
while (!eh->die)
event_base_dispatch (base);
/* shut down the thread */
tr_lockFree (eh->lock);
event_base_free (base);
eh->session->events = NULL;
tr_free (eh);
tr_logAddDebug ("Closing libevent thread");
}
static tr_socket_t tr_netBindTCPImpl(tr_address const* addr, tr_port port, bool suppressMsgs, int* errOut)
{
TR_ASSERT(tr_address_is_valid(addr));
static int const domains[NUM_TR_AF_INET_TYPES] = { AF_INET, AF_INET6 };
struct sockaddr_storage sock;
tr_socket_t fd;
int addrlen;
int optval;
fd = socket(domains[addr->type], SOCK_STREAM, 0);
if (fd == TR_BAD_SOCKET)
{
*errOut = sockerrno;
return TR_BAD_SOCKET;
}
if (evutil_make_socket_nonblocking(fd) == -1)
{
*errOut = sockerrno;
tr_netCloseSocket(fd);
return TR_BAD_SOCKET;
}
optval = 1;
setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void const*)&optval, sizeof(optval));
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void const*)&optval, sizeof(optval));
#ifdef IPV6_V6ONLY
if (addr->type == TR_AF_INET6)
{
if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, (void const*)&optval, sizeof(optval)) == -1)
{
if (sockerrno != ENOPROTOOPT) /* if the kernel doesn't support it, ignore it */
{
*errOut = sockerrno;
tr_netCloseSocket(fd);
return TR_BAD_SOCKET;
}
}
}
#endif
addrlen = setup_sockaddr(addr, htons(port), &sock);
if (bind(fd, (struct sockaddr*)&sock, addrlen) == -1)
{
int const err = sockerrno;
if (!suppressMsgs)
{
char const* fmt;
char const* hint;
char err_buf[512];
if (err == EADDRINUSE)
{
hint = _("Is another copy of Transmission already running?");
}
else
{
hint = NULL;
}
if (hint == NULL)
{
fmt = _("Couldn't bind port %d on %s: %s");
}
else
{
fmt = _("Couldn't bind port %d on %s: %s (%s)");
}
tr_logAddError(fmt, port, tr_address_to_string(addr), tr_net_strerror(err_buf, sizeof(err_buf), err), hint);
}
tr_netCloseSocket(fd);
*errOut = err;
return TR_BAD_SOCKET;
}
if (!suppressMsgs)
{
tr_logAddDebug("Bound socket %" PRIdMAX " to port %d on %s", (intmax_t)fd, port, tr_address_to_string(addr));
}
#ifdef TCP_FASTOPEN
#ifndef SOL_TCP
#define SOL_TCP IPPROTO_TCP
#endif
optval = 5;
setsockopt(fd, SOL_TCP, TCP_FASTOPEN, (void const*)&optval, sizeof(optval));
#endif
if (listen(fd, 128) == -1)
{
*errOut = sockerrno;
tr_netCloseSocket(fd);
return TR_BAD_SOCKET;
}
return fd;
}
static int
pgpipe (int handles[2])
{
SOCKET s;
struct sockaddr_in serv_addr;
int len = sizeof (serv_addr);
handles[0] = handles[1] = INVALID_SOCKET;
if ((s = socket (AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
{
tr_logAddDebug ("pgpipe failed to create socket: %ui", WSAGetLastError ());
return -1;
}
memset (&serv_addr, 0, sizeof (serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons (0);
serv_addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
if (bind (s, (SOCKADDR *) & serv_addr, len) == SOCKET_ERROR)
{
tr_logAddDebug ("pgpipe failed to bind: %ui", WSAGetLastError ());
closesocket (s);
return -1;
}
if (listen (s, 1) == SOCKET_ERROR)
{
tr_logAddNamedDbg ("event","pgpipe failed to listen: %ui", WSAGetLastError ());
closesocket (s);
return -1;
}
if (getsockname (s, (SOCKADDR *) & serv_addr, &len) == SOCKET_ERROR)
{
tr_logAddDebug ("pgpipe failed to getsockname: %ui", WSAGetLastError ());
closesocket (s);
return -1;
}
if ((handles[1] = socket (PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
{
tr_logAddDebug ("pgpipe failed to create socket 2: %ui", WSAGetLastError ());
closesocket (s);
return -1;
}
if (connect (handles[1], (SOCKADDR *) & serv_addr, len) == SOCKET_ERROR)
{
tr_logAddDebug ("pgpipe failed to connect socket: %ui", WSAGetLastError ());
closesocket (s);
return -1;
}
if ((handles[0] = accept (s, (SOCKADDR *) & serv_addr, &len)) == INVALID_SOCKET)
{
tr_logAddDebug ("pgpipe failed to accept socket: %ui", WSAGetLastError ());
closesocket (handles[1]);
handles[1] = INVALID_SOCKET;
closesocket (s);
return -1;
}
closesocket (s);
return 0;
}
/**
* returns 0 on success, or an errno value on failure.
* errno values include ENOENT if the parent folder doesn't exist,
* plus the errno values set by tr_mkdirp () and open ().
*/
static int
cached_file_open (struct tr_cached_file * o,
const char * filename,
bool writable,
tr_preallocation_mode allocation,
uint64_t file_size)
{
int flags;
struct stat sb;
bool already_existed;
bool resize_needed;
/* create subfolders, if any */
if (writable)
{
char * dir = tr_dirname (filename);
const int err = tr_mkdirp (dir, 0777) ? errno : 0;
if (err)
{
tr_logAddError (_("Couldn't create \"%1$s\": %2$s"), dir, tr_strerror (err));
tr_free (dir);
return err;
}
tr_free (dir);
}
already_existed = !stat (filename, &sb) && S_ISREG (sb.st_mode);
if (writable && !already_existed && (allocation == TR_PREALLOCATE_FULL))
if (preallocate_file_full (filename, file_size))
tr_logAddDebug ("Preallocated file \"%s\"", filename);
/* we can't resize the file w/o write permissions */
resize_needed = already_existed && (file_size < (uint64_t)sb.st_size);
writable |= resize_needed;
/* open the file */
flags = writable ? (O_RDWR | O_CREAT) : O_RDONLY;
flags |= O_LARGEFILE | O_BINARY | O_SEQUENTIAL;
o->fd = open (filename, flags, 0666);
if (o->fd == -1)
{
const int err = errno;
tr_logAddError (_("Couldn't open \"%1$s\": %2$s"), filename, tr_strerror (err));
return err;
}
/* If the file already exists and it's too large, truncate it.
* This is a fringe case that happens if a torrent's been updated
* and one of the updated torrent's files is smaller.
* http://trac.transmissionbt.com/ticket/2228
* https://bugs.launchpad.net/ubuntu/+source/transmission/+bug/318249
*/
if (resize_needed && (ftruncate (o->fd, file_size) == -1))
{
const int err = errno;
tr_logAddError (_("Couldn't truncate \"%1$s\": %2$s"), filename, tr_strerror (err));
return err;
}
if (writable && !already_existed && (allocation == TR_PREALLOCATE_SPARSE))
preallocate_file_sparse (o->fd, file_size);
/* Many (most?) clients request blocks in ascending order,
* so increase the readahead buffer.
* Also, disable OS-level caching because "inactive memory" angers users. */
tr_set_file_for_single_pass (o->fd);
return 0;
}
/**
* returns 0 on success, or an errno value on failure.
* errno values include ENOENT if the parent folder doesn't exist,
* plus the errno values set by tr_sys_dir_create () and tr_sys_file_open ().
*/
static int
cached_file_open (struct tr_cached_file * o,
const char * filename,
bool writable,
tr_preallocation_mode allocation,
uint64_t file_size)
{
int flags;
tr_sys_path_info info;
bool already_existed;
bool resize_needed;
tr_sys_file_t fd = TR_BAD_SYS_FILE;
tr_error * error = NULL;
/* create subfolders, if any */
if (writable)
{
char * dir = tr_sys_path_dirname (filename, NULL);
if (!tr_sys_dir_create (dir, TR_SYS_DIR_CREATE_PARENTS, 0777, &error))
{
tr_logAddError (_("Couldn't create \"%1$s\": %2$s"), dir, error->message);
tr_free (dir);
goto fail;
}
tr_free (dir);
}
already_existed = tr_sys_path_get_info (filename, 0, &info, NULL) && info.type == TR_SYS_PATH_IS_FILE;
/* we can't resize the file w/o write permissions */
resize_needed = already_existed && (file_size < info.size);
writable |= resize_needed;
/* open the file */
flags = writable ? (TR_SYS_FILE_WRITE | TR_SYS_FILE_CREATE) : 0;
flags |= TR_SYS_FILE_READ | TR_SYS_FILE_SEQUENTIAL;
fd = tr_sys_file_open (filename, flags, 0666, &error);
if (fd == TR_BAD_SYS_FILE)
{
tr_logAddError (_("Couldn't open \"%1$s\": %2$s"), filename, error->message);
goto fail;
}
if (writable && !already_existed && allocation != TR_PREALLOCATE_NONE)
{
bool success = false;
const char * type = NULL;
if (allocation == TR_PREALLOCATE_FULL)
{
success = preallocate_file_full (fd, file_size, &error);
type = _("full");
}
else if (allocation == TR_PREALLOCATE_SPARSE)
{
success = preallocate_file_sparse (fd, file_size, &error);
type = _("sparse");
}
assert (type != NULL);
if (!success)
{
tr_logAddError (_("Couldn't preallocate file \"%1$s\" (%2$s, size: %3$"PRIu64"): %4$s"),
filename, type, file_size, error->message);
goto fail;
}
tr_logAddDebug (_("Preallocated file \"%1$s\" (%2$s, size: %3$"PRIu64")"), filename, type, file_size);
}
/* If the file already exists and it's too large, truncate it.
* This is a fringe case that happens if a torrent's been updated
* and one of the updated torrent's files is smaller.
* http://trac.transmissionbt.com/ticket/2228
* https://bugs.launchpad.net/ubuntu/+source/transmission/+bug/318249
*/
if (resize_needed && !tr_sys_file_truncate (fd, file_size, &error))
{
tr_logAddError (_("Couldn't truncate \"%1$s\": %2$s"), filename, error->message);
goto fail;
}
o->fd = fd;
return 0;
fail:
{
const int err = error->code;
tr_error_free (error);
if (fd != TR_BAD_SYS_FILE)
tr_sys_file_close (fd, NULL);
return err;
}
}
