/*
* Open server socket on specified port to accept connection from sessions
*/
int
pool_listen(unsigned short port, const char *unixSocketName)
{
int fd,
len;
struct sockaddr_un unix_addr;
int maxconn;
#ifdef HAVE_UNIX_SOCKETS
if (Lock_AF_UNIX(port, unixSocketName) < 0)
return -1;
/* create a Unix domain stream socket */
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
return -1;
/* fill in socket address structure */
memset(&unix_addr, 0, sizeof(unix_addr));
unix_addr.sun_family = AF_UNIX;
strcpy(unix_addr.sun_path, sock_path);
len = sizeof(unix_addr.sun_family) +
strlen(unix_addr.sun_path) + 1;
/* bind the name to the descriptor */
if (bind(fd, (struct sockaddr *) & unix_addr, len) < 0)
return -1;
/*
* Select appropriate accept-queue length limit. PG_SOMAXCONN is only
* intended to provide a clamp on the request on platforms where an
* overly large request provokes a kernel error (are there any?).
*/
maxconn = MaxBackends * 2;
if (maxconn > PG_SOMAXCONN)
maxconn = PG_SOMAXCONN;
/* tell kernel we're a server */
if (listen(fd, maxconn) < 0)
return -1;
/* Arrange to unlink the socket file at exit */
on_proc_exit(StreamDoUnlink, 0);
return fd;
#else
/* TODO support for non-unix platform */
ereport(FATAL,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("pool manager only supports UNIX socket")));
return -1;
#endif
}
int
StreamServerPort(int family, char *hostName, unsigned short portNumber,
char *unixSocketName,
pgsocket ListenSocket[], int MaxListen)
{
pgsocket fd;
int err;
int maxconn;
int ret;
char portNumberStr[32];
const char *familyDesc;
char familyDescBuf[64];
char *service;
struct addrinfo *addrs = NULL,
*addr;
struct addrinfo hint;
int listen_index = 0;
int added = 0;
#if !defined(WIN32) || defined(IPV6_V6ONLY)
int one = 1;
#endif
/* Initialize hint structure */
MemSet(&hint, 0, sizeof(hint));
hint.ai_family = family;
hint.ai_flags = AI_PASSIVE;
hint.ai_socktype = SOCK_STREAM;
#ifdef HAVE_UNIX_SOCKETS
if (family == AF_UNIX)
{
/* Lock_AF_UNIX will also fill in sock_path. */
if (Lock_AF_UNIX(portNumber, unixSocketName) != STATUS_OK)
return STATUS_ERROR;
service = sock_path;
}
else
#endif /* HAVE_UNIX_SOCKETS */
{
snprintf(portNumberStr, sizeof(portNumberStr), "%d", portNumber);
service = portNumberStr;
}
ret = pg_getaddrinfo_all(hostName, service, &hint, &addrs);
if (ret || !addrs)
{
if (hostName)
ereport(LOG,
(errmsg("could not translate host name \"%s\", service \"%s\" to address: %s",
hostName, service, gai_strerror(ret))));
else
ereport(LOG,
(errmsg("could not translate service \"%s\" to address: %s",
service, gai_strerror(ret))));
if (addrs)
pg_freeaddrinfo_all(hint.ai_family, addrs);
return STATUS_ERROR;
}
for (addr = addrs; addr; addr = addr->ai_next)
{
if (!IS_AF_UNIX(family) && IS_AF_UNIX(addr->ai_family))
{
/*
* Only set up a unix domain socket when they really asked for it.
* The service/port is different in that case.
*/
continue;
}
/* See if there is still room to add 1 more socket. */
for (; listen_index < MaxListen; listen_index++)
{
if (ListenSocket[listen_index] == PGINVALID_SOCKET)
break;
}
if (listen_index >= MaxListen)
{
ereport(LOG,
(errmsg("could not bind to all requested addresses: MAXLISTEN (%d) exceeded",
MaxListen)));
break;
}
/* set up family name for possible error messages */
switch (addr->ai_family)
{
case AF_INET:
familyDesc = _("IPv4");
break;
#ifdef HAVE_IPV6
case AF_INET6:
familyDesc = _("IPv6");
break;
#endif
#ifdef HAVE_UNIX_SOCKETS
case AF_UNIX:
familyDesc = _("Unix");
break;
#endif
default:
snprintf(familyDescBuf, sizeof(familyDescBuf),
_("unrecognized address family %d"),
addr->ai_family);
familyDesc = familyDescBuf;
break;
}
if ((fd = socket(addr->ai_family, SOCK_STREAM, 0)) < 0)
{
ereport(LOG,
(errcode_for_socket_access(),
/* translator: %s is IPv4, IPv6, or Unix */
errmsg("could not create %s socket: %m",
familyDesc)));
continue;
}
#ifndef WIN32
/*
* Without the SO_REUSEADDR flag, a new postmaster can't be started
* right away after a stop or crash, giving "address already in use"
* error on TCP ports.
*
* On win32, however, this behavior only happens if the
* SO_EXLUSIVEADDRUSE is set. With SO_REUSEADDR, win32 allows multiple
* servers to listen on the same address, resulting in unpredictable
* behavior. With no flags at all, win32 behaves as Unix with
* SO_REUSEADDR.
*/
if (!IS_AF_UNIX(addr->ai_family))
{
if ((setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
(char *) &one, sizeof(one))) == -1)
{
ereport(LOG,
(errcode_for_socket_access(),
errmsg("setsockopt(SO_REUSEADDR) failed: %m")));
closesocket(fd);
continue;
}
}
#endif
#ifdef IPV6_V6ONLY
if (addr->ai_family == AF_INET6)
{
if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY,
(char *) &one, sizeof(one)) == -1)
{
ereport(LOG,
(errcode_for_socket_access(),
errmsg("setsockopt(IPV6_V6ONLY) failed: %m")));
closesocket(fd);
continue;
}
}
#endif
/*
* Note: This might fail on some OS's, like Linux older than
* 2.4.21-pre3, that don't have the IPV6_V6ONLY socket option, and map
* ipv4 addresses to ipv6. It will show ::ffff:ipv4 for all ipv4
* connections.
*/
err = bind(fd, addr->ai_addr, addr->ai_addrlen);
if (err < 0)
{
ereport(LOG,
(errcode_for_socket_access(),
/* translator: %s is IPv4, IPv6, or Unix */
errmsg("could not bind %s socket: %m",
familyDesc),
(IS_AF_UNIX(addr->ai_family)) ?
errhint("Is another postmaster already running on port %d?"
" If not, remove socket file \"%s\" and retry.",
(int) portNumber, sock_path) :
errhint("Is another postmaster already running on port %d?"
" If not, wait a few seconds and retry.",
(int) portNumber)));
closesocket(fd);
continue;
}
#ifdef HAVE_UNIX_SOCKETS
if (addr->ai_family == AF_UNIX)
{
if (Setup_AF_UNIX() != STATUS_OK)
{
closesocket(fd);
break;
}
}
#endif
/*
* Select appropriate accept-queue length limit. PG_SOMAXCONN is only
* intended to provide a clamp on the request on platforms where an
* overly large request provokes a kernel error (are there any?).
*/
maxconn = MaxBackends * 2;
if (maxconn > PG_SOMAXCONN)
maxconn = PG_SOMAXCONN;
err = listen(fd, maxconn);
if (err < 0)
{
ereport(LOG,
(errcode_for_socket_access(),
/* translator: %s is IPv4, IPv6, or Unix */
errmsg("could not listen on %s socket: %m",
familyDesc)));
closesocket(fd);
continue;
}
ListenSocket[listen_index] = fd;
added++;
}
pg_freeaddrinfo_all(hint.ai_family, addrs);
if (!added)
return STATUS_ERROR;
return STATUS_OK;
}
