/* * Bind a socket to a privileged IP port */ int bindresvport_sa(int sd, struct sockaddr *sa) { int res; static short port; struct sockaddr_storage myaddr; socklen_t salen; int i; #define STARTPORT 600 #define ENDPORT (IPPORT_RESERVED - 1) #define NPORTS (ENDPORT - STARTPORT + 1) if (sa == NULL) { salen = sizeof(myaddr); sa = ss2sa(&myaddr); res = getsockname(sd, sa, &salen); if (res < 0) return (-1); } if (!sa_is_inet(sa)) { errno = EPFNOSUPPORT; return (-1); } if (port == 0) { port = (getpid() % NPORTS) + STARTPORT; } res = -1; errno = EADDRINUSE; for (i = 0; i < NPORTS && res < 0 && errno == EADDRINUSE; i++) { sa_setport(sa, htons(port++)); if (port > ENDPORT) { port = STARTPORT; } res = bind(sd, sa, socklen(sa)); } return (res); }
/* * Usage: * xprt = svcudp_create(sock); * * If sock<0 then a socket is created, else sock is used. * If the socket, sock is not bound to a port then svcudp_create * binds it to an arbitrary port. In any (successful) case, * xprt->xp_sock is the registered socket number and xprt->xp_port is the * associated port number. * Once *xprt is initialized, it is registered as a transporter; * see (svc.h, xprt_register). * The routines returns NULL if a problem occurred. */ SVCXPRT * svcudp_bufcreate( int sock, u_int sendsz, u_int recvsz) { bool_t madesock = FALSE; SVCXPRT *xprt; struct svcudp_data *su; struct sockaddr_storage ss; struct sockaddr *sa = (struct sockaddr *)&ss; socklen_t len; if (sock == RPC_ANYSOCK) { if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { perror("svcudp_create: socket creation problem"); return ((SVCXPRT *)NULL); } set_cloexec_fd(sock); madesock = TRUE; memset(&ss, 0, sizeof(ss)); sa->sa_family = AF_INET; } else { len = sizeof(struct sockaddr_storage); if (getsockname(sock, sa, &len) < 0) { perror("svcudp_create - cannot getsockname"); return ((SVCXPRT *)NULL); } } if (bindresvport_sa(sock, sa)) { sa_setport(sa, 0); (void)bind(sock, sa, sa_socklen(sa)); } len = sizeof(struct sockaddr_storage); if (getsockname(sock, sa, &len) != 0) { perror("svcudp_create - cannot getsockname"); if (madesock) (void)close(sock); return ((SVCXPRT *)NULL); } xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT)); if (xprt == NULL) { (void)fprintf(stderr, "svcudp_create: out of memory\n"); return (NULL); } su = (struct svcudp_data *)mem_alloc(sizeof(*su)); if (su == NULL) { (void)fprintf(stderr, "svcudp_create: out of memory\n"); return (NULL); } su->su_iosz = ((MAX(sendsz, recvsz) + 3) / 4) * 4; if ((rpc_buffer(xprt) = mem_alloc(su->su_iosz)) == NULL) { (void)fprintf(stderr, "svcudp_create: out of memory\n"); return (NULL); } xdrmem_create( &(su->su_xdrs), rpc_buffer(xprt), su->su_iosz, XDR_DECODE); su->su_cache = NULL; xprt->xp_p2 = (caddr_t)su; xprt->xp_auth = NULL; xprt->xp_verf.oa_base = su->su_verfbody; xprt->xp_ops = &svcudp_op; xprt->xp_port = sa_getport(sa); xprt->xp_sock = sock; xprt_register(xprt); return (xprt); }