/**
* nfs_svc_create - start up RPC svc listeners
* @name: C string containing name of new service
* @program: RPC program number to register
* @version: RPC version number to register
* @dispatch: address of function that handles incoming RPC requests
* @port: if not zero, transport listens on this port
*
* Sets up network transports for receiving RPC requests, and starts
* the RPC dispatcher. Returns the number of started network transports.
*/
unsigned int
nfs_svc_create(char *name, const rpcprog_t program, const rpcvers_t version,
void (*dispatch)(struct svc_req *, SVCXPRT *),
const uint16_t port)
{
const struct sigaction create_sigaction = {
.sa_handler = SIG_IGN,
};
unsigned int visible, up, servport;
struct netconfig *nconf;
void *handlep;
/*
* Ignore SIGPIPE to avoid exiting sideways when peers
* close their TCP connection while we're trying to reply
* to them.
*/
(void)sigaction(SIGPIPE, &create_sigaction, NULL);
handlep = setnetconfig();
if (handlep == NULL) {
xlog(L_ERROR, "Failed to access local netconfig database: %s",
nc_sperror());
return 0;
}
visible = 0;
up = 0;
while ((nconf = getnetconfig(handlep)) != NULL) {
if (!(nconf->nc_flag & NC_VISIBLE))
continue;
visible++;
if (port == 0)
servport = getservport(program, nconf->nc_proto);
else
servport = port;
up += svc_create_nconf(name, program, version, dispatch,
servport, nconf);
}
if (visible == 0)
xlog(L_ERROR, "Failed to find any visible netconfig entries");
if (endnetconfig(handlep) == -1)
xlog(L_ERROR, "Failed to close local netconfig database: %s",
nc_sperror());
return up;
}
static int
svc_socket (u_long number, int type, int protocol, int reuse)
{
struct sockaddr_in addr;
socklen_t len = sizeof (struct sockaddr_in);
int sock, ret;
const char *proto = protocol == IPPROTO_TCP ? "tcp" : "udp";
if ((sock = __socket (AF_INET, type, protocol)) < 0)
{
perror (_("svc_socket: socket creation problem"));
return sock;
}
if (reuse)
{
ret = 1;
ret = setsockopt (sock, SOL_SOCKET, SO_REUSEADDR, &ret,
sizeof (ret));
if (ret < 0)
{
perror (_("svc_socket: socket reuse problem"));
return ret;
}
}
memset (&addr, 0, sizeof (addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(getservport(number, proto));
if (bind(sock, (struct sockaddr *) &addr, len) < 0)
{
perror (_("svc_socket: bind problem"));
(void) __close(sock);
sock = -1;
}
return svcsock_nonblock(sock);
}
static int
svc_socket (u_long number, int type, int protocol, int reuse)
{
struct sockaddr_in addr;
socklen_t len = sizeof (struct sockaddr_in);
int sock, ret;
const char *proto = protocol == IPPROTO_TCP ? "tcp" : "udp";
if ((sock = __socket (AF_INET, type, protocol)) < 0)
{
perror (_("svc_socket: socket creation problem"));
return sock;
}
if (reuse)
{
ret = 1;
ret = setsockopt (sock, SOL_SOCKET, SO_REUSEADDR, &ret,
sizeof (ret));
if (ret < 0)
{
perror (_("svc_socket: socket reuse problem"));
return ret;
}
}
memset (&addr, 0, sizeof (addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(getservport(number, proto));
if (bind(sock, (struct sockaddr *) &addr, len) < 0)
{
perror (_("svc_socket: bind problem"));
(void) __close(sock);
sock = -1;
}
if (sock >= 0)
{
/* This socket might be shared among multiple processes
* if mountd is run multi-threaded. So it is safest to
* make it non-blocking, else all threads might wake
* one will get the data, and the others will block
* indefinitely.
* In all cases, transaction on this socket are atomic
* (accept for TCP, packet-read and packet-write for UDP)
* so O_NONBLOCK will not confuse unprepared code causing
* it to corrupt messages.
* It generally safest to have O_NONBLOCK when doing an accept
* as if we get a RST after the SYN and before accept runs,
* we can block despite being told there was an acceptable
* connection.
*/
int flags;
if ((flags = fcntl(sock, F_GETFL)) < 0)
{
perror (_("svc_socket: can't get socket flags"));
(void) __close (sock);
sock = -1;
}
else if (fcntl(sock, F_SETFL, flags|O_NONBLOCK) < 0)
{
perror (_("svc_socket: can't set socket flags"));
(void) __close (sock);
sock = -1;
}
}
return sock;
}